Relevant bibliographies by topics / Interactions directes de surface

Academic literature on the topic 'Interactions directes de surface'

Author: Grafiati
Published: 8 June 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Interactions directes de surface.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Interactions directes de surface":

1

Hoffecker, Ian T., Alan Shaw, Viktoria Sorokina, Ioanna Smyrlaki, and Björn Högberg. "Stochastic modeling of antibody binding predicts programmable migration on antigen patterns." Nature Computational Science 2, no. 3 (March 2022): 179–92. http://dx.doi.org/10.1038/s43588-022-00218-z.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
AbstractViruses and bacteria commonly exhibit spatial repetition of the surface molecules that directly interface with the host immune system. However, the complex interaction of patterned surfaces with immune molecules containing multiple binding domains is poorly understood. We developed a pipeline for constructing mechanistic models of antibody interactions with patterned antigen substrates. Our framework relies on immobilized DNA origami nanostructures decorated with precisely placed antigens. The results revealed that antigen spacing is a spatial control parameter that can be tuned to influence the antibody residence time and migration speed. The model predicts that gradients in antigen spacing can drive persistent, directed antibody migration in the direction of more stable spacing. These results depict antibody–antigen interactions as a computational system where antigen geometry constrains and potentially directs the antibody movement. We propose that this form of molecular programmability could be exploited during the co-evolution of pathogens and immune systems or in the design of molecular machines.
2

Tao, Feng. "Nanoscale surface chemistry in self- and directed-assembly of organic molecules on solid surfaces and synthesis of nanostructured organic architectures." Pure and Applied Chemistry 80, no. 1 (January 1, 2008): 45–57. http://dx.doi.org/10.1351/pac200880010045.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
This article briefly reviews the interplay of weak noncovalent interactions involved in the formation of self-assembled monolayers of organic molecules and the strong chemical binding in directed-assembly of organic molecules on solid surfaces. For a self-assembled monolayer, each molecule involves at least three categories of weak interactions, including molecule-substrate interactions, molecule-molecule interactions in a lamella, and molecule-molecule interactions between two adjacent lamellae. Basically, molecule-substrate interactions play a major role in determining molecular configuration. Molecule-molecule interactions, particularly the interactions of molecular ending functional groups between two adjacent lamellae, such as hydrogen bonds, play a dominant role in determining the molecular packing pattern in a monolayer. These weak interactions may induce or influence molecular chirality. This understanding at the atomic scale allows us to design 2D nanostructured organic materials via precisely manipulating these weak noncovalent interactions. Compared to the self-assembled monolayer formed via weak noncovalent interactions, the structure of directed-assembled monolayer/multilayers formed through strong chemical bonds is significantly dependent on the geometric arrangement and reactivity of active sites on the solid surface. In contrast to the significant role of weak intermolecular interactions in determining molecular packing in a self-assembled monolayer, strong chemical binding between molecules and reactive sites of a substrate plays a major role in determining the molecular packing pattern in a directed-assembly monolayer. Controllable chemical attachment between organic functional groups and reactive sites of the solid surface is crucial for the formation of a highly oriented organic monolayer and the following multilayer.
3

Ma, Lu-Yan, Glenn King, and Lawrence Rothfield. "Mapping the MinE Site Involved in Interaction with the MinD Division Site Selection Protein of Escherichia coli." Journal of Bacteriology 185, no. 16 (August 15, 2003): 4948–55. http://dx.doi.org/10.1128/jb.185.16.4948-4955.2003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
ABSTRACT Interactions between the MinD and MinE proteins are required for proper placement of the Escherichia coli division septum. The site within MinE that is required for interaction with MinD was mapped by studying the effects of site-directed minE mutations on MinD-MinE interactions in yeast two-hybrid and three-hybrid experiments. This confirmed that the MinE N-terminal domain is responsible for the interaction of MinE with MinD. Mutations that interfered with the interaction defined an extended surface on one face of the α-helical region of the MinE N-terminal domain, consistent with the idea that the MinE-MinD interaction involves formation of a coiled-coil structure by interaction with a complementary helical surface within MinD.
4

Christianson, Dawn R., Andrey S. Dobroff, Bettina Proneth, Amado J. Zurita, Ahmad Salameh, Eleonora Dondossola, Jun Makino, et al. "Ligand-directed targeting of lymphatic vessels uncovers mechanistic insights in melanoma metastasis." Proceedings of the National Academy of Sciences 112, no. 8 (February 6, 2015): 2521–26. http://dx.doi.org/10.1073/pnas.1424994112.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Metastasis is the most lethal step of cancer progression in patients with invasive melanoma. In most human cancers, including melanoma, tumor dissemination through the lymphatic vasculature provides a major route for tumor metastasis. Unfortunately, molecular mechanisms that facilitate interactions between melanoma cells and lymphatic vessels are unknown. Here, we developed an unbiased approach based on molecular mimicry to identify specific receptors that mediate lymphatic endothelial–melanoma cell interactions and metastasis. By screening combinatorial peptide libraries directly on afferent lymphatic vessels resected from melanoma patients during sentinel lymphatic mapping and lymph node biopsies, we identified a significant cohort of melanoma and lymphatic surface binding peptide sequences. The screening approach was designed so that lymphatic endothelium binding peptides mimic cell surface proteins on tumor cells. Therefore, relevant metastasis and lymphatic markers were biochemically identified, and a comprehensive molecular profile of the lymphatic endothelium during melanoma metastasis was generated. Our results identified expression of the phosphatase 2 regulatory subunit A, α-isoform (PPP2R1A) on the cell surfaces of both melanoma cells and lymphatic endothelial cells. Validation experiments showed that PPP2R1A is expressed on the cell surfaces of both melanoma and lymphatic endothelial cells in vitro as well as independent melanoma patient samples. More importantly, PPP2R1A-PPP2R1A homodimers occur at the cellular level to mediate cell–cell interactions at the lymphatic–tumor interface. Our results revealed that PPP2R1A is a new biomarker for melanoma metastasis and show, for the first time to our knowledge, an active interaction between the lymphatic vasculature and melanoma cells during tumor progression.
5

Linne, Christine, Daniele Visco, Stefano Angioletti-Uberti, Liedewij Laan, and Daniela J. Kraft. "Direct visualization of superselective colloid-surface binding mediated by multivalent interactions." Proceedings of the National Academy of Sciences 118, no. 36 (August 31, 2021): e2106036118. http://dx.doi.org/10.1073/pnas.2106036118.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Reliably distinguishing between cells based on minute differences in receptor density is crucial for cell–cell or virus–cell recognition, the initiation of signal transduction, and selective targeting in directed drug delivery. Such sharp differentiation between different surfaces based on their receptor density can only be achieved by multivalent interactions. Several theoretical and experimental works have contributed to our understanding of this “superselectivity.” However, a versatile, controlled experimental model system that allows quantitative measurements on the ligand–receptor level is still missing. Here, we present a multivalent model system based on colloidal particles equipped with surface-mobile DNA linkers that can superselectively target a surface functionalized with the complementary mobile DNA-linkers. Using a combined approach of light microscopy and Foerster resonance energy transfer (FRET), we can directly observe the binding and recruitment of the ligand–receptor pairs in the contact area. We find a nonlinear transition in colloid-surface binding probability with increasing ligand or receptor concentration. In addition, we observe an increased sensitivity with weaker ligand–receptor interactions, and we confirm that the timescale of binding reversibility of individual linkers has a strong influence on superselectivity. These unprecedented insights on the ligand–receptor level provide dynamic information into the multivalent interaction between two fluidic membranes mediated by both mobile receptors and ligands and will enable future work on the role of spatial–temporal ligand–receptor dynamics on colloid-surface binding.
6

Stanković, Igor, Luis Lizardi, and Carlos García. "Assembly of nanocube super-structures directed by surface and magnetic interactions." Nanoscale 12, no. 37 (2020): 19390–403. http://dx.doi.org/10.1039/d0nr03485a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Wang, Sheng-Hung, Ying-Ta Wu, Sheng-Chu Kuo, and John Yu. "HotLig: A Molecular Surface-Directed Approach to Scoring Protein–Ligand Interactions." Journal of Chemical Information and Modeling 53, no. 8 (August 2013): 2181–95. http://dx.doi.org/10.1021/ci400302d.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Carpick, Robert W., and Mark A. Eriksson. "Measurements of In-Plane Material Properties with Scanning Probe Microscopy." MRS Bulletin 29, no. 7 (July 2004): 472–77. http://dx.doi.org/10.1557/mrs2004.141.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
AbstractScanning probe microscopy (SPM) was originally conceived as a method for measuring atomic-scale surface topography. Over the last two decades, it has blossomed into an array of techniques that can be used to obtain a rich variety of information about nanoscale material properties. With the exception of friction measurements, these techniques have traditionally depended on tip—sample interactions directed normal to the sample's surface. Recently, researchers have explored several effects arising from interactions parallel to surfaces, usually by deliberately applying a modulated lateral displacement. In fact, some parallel motion is ubiquitous to cantilever-based SPM, due to the tilt of the cantilever. Recent studies, performed in contact, noncontact, and intermittent-contact modes, provide new insights into properties such as structural anisotropy, lateral interactions with surface features, nanoscale shear stress and contact mechanics, and in-plane energy dissipation. The understanding gained from interpreting this behavior has consequences for all cantilever-based scanning probe microscopies.
9

Demir Kanmazalp, S., M. Sagher, N. Dege, and H. Içbudak. "Synthesis, Hirshfeld Surface, FT-IR Analysis and Single Crystal X-Ray Structure of 2-amino-3-hydroxypyridinium saccharinate." Журнал структурной химии 64, no. 6 (2023): 112678. http://dx.doi.org/10.26902/jsc_id112678.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The title compound 2-amino-3-hydroxypyridinium saccharinate (AHPSAC) was synthesized and the obtaining single crystal was characterized by elemental analysis, XRD, 1H-NMR and FT-IR spectroscopic analyses. The title compound, AHPSAC, has a non-planar configuration and crystallized in the monoclinic crystal system with Cc space group with the sequent parameters: a = 11.9535 (11) Å, b = 9.1942 (9) Å, c = 13.2391 (12) Å, β = 115.608 (6)˚, V = 1312.1(2) Å3, Z = 4. The asymmetric unit contains one-half of a C5H7N2O molecule and one-half of a C7H4N1O3S1 molecule. The crystal packing is mainly directed by strong hydrogen bonding interactions observed N—H⋯N and N—H⋯O but, in addition, weak interaction such as π⋯π is also sighted. Hirshfeld surface analyses and 2D fingerprint graphs were accomplished to find out diverse bonding interactions in the AHPSAC compound. These results show that most of the contribution to the Hirshfeld surfaces came from O⋯H/ H⋯O (35.2%) contacts.
10

Superfine, R., M. R. Falvo, G. J. Clary, S. Paulson, R. M. Taylor, V. Chi, F. P. Brooks, and S. Washburn. "Nanomanipulation for Material Properties, Substrate Interactions and Devices." Microscopy and Microanalysis 4, S2 (July 1998): 336–37. http://dx.doi.org/10.1017/s1431927600021802.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
In many cases in experimental science, it is true that the instrument interface becomes a limiting factor in the efficacy of carrying out unusual experiments, or prevents the complete understanding of the acquired data. We are developing an advanced interface for Scanning Probe Microscopy (SPM) which allows intuitive rendering of datasets and natural instrument control, all in real-time. The interface, called the nanoManipulator, combines a high performance graphics engine for real-time data rendering with a haptic interface which places the human operator directly into the “feedback loop” that controls surface manipulations. In practice, the user holds a stylus in hand. By moving the stylus laterally, the user directs the movement of the SPM tip across the sample. The haptic interface enables the user to “feel” the surface by forcing the stylus to move up and down in response to the surface topography.
More sources
You might also be interested in the extended bibliographies on the topic 'Interactions directes de surface' for particular source types:
Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "Interactions directes de surface":

1

Wu, Hung-Jen. "Direct measurements of ensemble particle and surface interactions on homogeneous and patterned substrates." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3747.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
In this dissertation, we describe a novel method that we call Diffusing Colloidal Probe Microscopy (DCPM), which integrates Total Internal Reflection Microscopy (TIRM) and Video Microscopy (VM) methods to monitor three dimensional trajectories in colloidal ensembles levitated above macroscopic surfaces. TIRM and VM are well established optical microscopy techniques for measuring normal and lateral colloidal excursions near macroscopic planar surfaces. The interactions between particle-particle and particle-substrate in colloidal interfacial systems are interpreted by statistical analyses from distributions of colloidal particles; dynamic properties of colloidal assembly are also determined from particle trajectories. Our studies show that DCPM is able to detect many particle-surface interactions simultaneously and provides an ensemble average measurement of particle-surface interactions on a homogeneous surface to allow direct comparison of distributed and average properties. A benefit of ensemble averaging of many particles is the diminished need for time averaging, which can produce orders of magnitude faster measurement times at higher interfacial particle concentrations. The statistical analyses (Ornstein- Zernike and three dimensional Monte Carlo analyses) are used to obtain particle-particle interactions from lateral distribution functions and to understand the role of nonuniformities in interfacial colloidal systems. An inconsistent finding is the observation of an anomalous long range particle-particle attraction and recovery of the expected DLVO particle-wall interactions for all concentrations examined. The possible influence of charge heterogeneity and particle size polydispersity on measured distribution functions is discussed in regard to inconsistent particle-wall and particle-particle potentials. In the final part of this research, the ability of DCPM is demonstrated to map potential energy landscapes on patterned surfaces by monitoring interactions between diffusing colloidal probes with Au pattern features. Absolute separation is obtained from theoretical fits to measured potential energy profiles and direct measurement by sticking silica colloids to Au surfaces via electrophoretic deposition. Initial results indicate that, as colloidal probe and pattern feature dimensions become comparable, measured potential energy profiles suffer some distortion due to the increased probability of probes interacting with surfaces at the edges of adjacent pattern features. Measurements of lateral diffusion via analysis of mean square displacements also indicated lateral diffusion coefficients in excellent agreement with rigorous theoretical predictions.
2

Everett, William Neil. "Evanescent wave and video microscopy methods for directly measuring interactions between surface-immobilized biomolecules." Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1585.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Jespersen, Michael L. 1979. "Engineering the macro-nano interface: Designing the directed self-assembly and interfacial interactions of gold nanoparticle monolayers." Thesis, University of Oregon, 2008. http://hdl.handle.net/1794/7504.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
xviii, 192 p.
Gold nanoparticles in the 1-2 mn core diameter size regime have generated a great deal of interest due to their size-dependent electronic, optical, and catalytic properties. A number of proof-of-concept experiments have demonstrated that small metal nanoparticles can be integrated into single electron transistors and optical waveguides. Still, reliable incorporation of gold nanoparticles into devices requires practical methods for their assembly on surfaces. Additionally, surface modification methods must be developed in order to control interparticle interactions and nanoparticle-environment interactions for use in sensing and catalysis. In this research, nanoparticle-substrate interactions were utilized to assemble surface-bound gold nanoparticle monolayers with interesting electronic and catalytic properties. Gold nanoparticles (1.5 nm diameter) with a thiol ligand shell containing phosphonic acid terminal functionality were synthesized and assembled selectively onto hafnium-modified silicon dioxide substrates through bonding of the terminal phosphonate to Hf(IV) surface groups. By increasing the surface coverage of Hf, it was possible to assemble monolayers of gold nanoparticles dense enough to exhibit nonlinear current-voltage properties across a 5-μm electrode gap at room temperature. Moreover, by taking advantage of the selectivity of this ligand shell for ZnO over SiO 2 , small gold nanoparticles were utilized as catalysts for selective growth of patterned, vertical ZnO nanowire arrays. In addition to engineering nanoparticle-substrate interactions, new surface modification methods were introduced to manipulate the interaction of the as-deposited gold nanoparticle monolayers with the environment. For example, thiol-thiol ligand exchange reactions were carried out on the surface-bound nanoparticle monolayers by immersion in dilute thiol solutions. Contact angle and XPS measurements indicate that the upper, surface-exposed phosphonic acid ligands are replaced by incoming thiol ligands. TEM measurements indicate that nanoparticle monolayers remain surface-bound and are stable to this exchange process, as the average particle size and surface coverage are preserved. As another example, the ligand shell can be partially removed by UV/ozone treatment to expose bare gold cores to the surrounding environment. On metal oxide substrates, this approach activates the particles for room temperature oxidation of carbon monoxide to carbon dioxide. This dissertation includes both my previously published and my co-authored materials.
Adviser: James E. Hutchison
4

Zhang, Jing. "Design and implementation of DNA-Directed Immobilisation (DDI) glycoarrays for probing carbohydrate-protein interactions." Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00605541.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Haidar, Ali. "Numerical simulation of nonlinear shallow-water interactions between surface waves and a floating structure." Electronic Thesis or Diss., Université de Montpellier (2022-....), 2022. https://ged.scdi-montpellier.fr/florabium/jsp/nnt.jsp?nnt=2022UMONS093.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Dans cette Thèse de Doctorat, nous nous intéressons à deux problématiques: (i) le développement de stratégies de stabilisation pour des méthodes de type discontinuous Galerkin (DG) appliquées à des écoulements shallow-water fortement non-linéaires, (ii) le développement d'une stratégie de modélisation et de simulation numérique des interactions non-linéaires entre les vagues et un objet flottant en surface, partiellement immergé. Les outils développés dans le cadre du premier axe de travail sont mis à profit et valorisés au cours de la deuxième partie.Les méthodes de discrétisation de type DG d'ordre élevé présentent en général des problèmes de robustesse en présence de singularités de la solution. Ces singularités peuvent être de plusieurs natures: discontinuité de la solution, discontinuité du gradient ou encore violation de la positivité de la hauteur d'eau pour des écoulements à surface libre. Nous introduisons dans la première partie de ce manuscript deux approches de type Finite-Volume Subcells permettant d'apporter une réponse à ces problèmes de robustesse. La première approche repose sur une correction a priori du schéma DG associée à un limiteur TVB et un limiteur de positivité. La seconde approche s'appuie quant à elle sur une correction a posteriori permettant d'identifier avec une meilleure précision les cellules incriminée, ainsi que sur les propriétés de robustesse inhérentes au schéma Volumes-Finis limite d'ordre un. Cette seconde approche permet d'assurer la robustesse du schéma DG initial en présence de discontinuité, ainsi que la positivité de la hauteur d'eau, tout en préservant une excellente qualité d'approximation, bénéficiant d'une résolution de l'ordre de la sous-maille. De façon préliminaire, cette seconde approche est également étendue au cas de la dimension deux d'espace horizontal. De nombreux cas-test permettent de valider cette approche.Dans la seconde partie, nous introduisons une nouvelle stratégie numérique conçue pour la modélisation et la simulation des interactions non linéaires entre les vagues en eau peu profonde et un objet flottant partiellement immergé. Au niveau continu, l'écoulement situé dans le domaine extérieur est globalement modélisé par les équations hyperboliques non-linéaires de Saint-Venant, tandis que la description de l'écoulement sous l'objet se réduit à une équation différentielle ordinaire non linéaire. Le couplage entre l'écoulement et l'objet est formulé comme un problème au bord, associé au calcul de l'évolution temporelle de la position des points d'interface air-eau-objet. Au niveau discret, la formulation proposée s'appuie sur une approximation DG d'ordre arbitraire, stabilisée à l'aide de la méthode de correction locale des sous-cellules (a posteriori) introduite dans la première partie. L'évolution temporelle de l'interface air-eau-objet est calculée à partir d'une description Arbitrary Lagrangian-Eulerian (ALE) et d'une transformation appropriée entre la configuration initiale et celle dépendant du temps. Pour n'importe quel ordre d'approximation polynomiale, l'algorithme résultant est capable de: (1) préserver la loi de conservation géométrique discrète (DGCL), (2) garantir la préservation de la positivité de la hauteur d'eau au niveau des sous-cellules, (3) préserver la classe des états stationnaires au repos (well-balancing), éventuellement en présence d'un objet partiellement immergé.Plusieurs validations numériques sont présentées, montrant le caractère opératoire de cette approche, et mettant en évidence que le modèle numérique proposé: (1) permet effectivement de modéliser les différents types d'interactions vague / objet flottants, (2) calcul efficacement l' évolution temporelle des points de contact air-eau-objet et redéfinit en conséquence le nouveau maillage grâce à la méthode ALE, (3) gère avec précision et robustesse les possibles singularités de l'écoulement, (4) préserve la haute résolution des schémas DG au niveau des sous-cellules
In this Ph.D., we investigate two main research problems: (i) the design of stabilization patches for higher-order discontinuous-Galerkin (DG) methods applied to highly nonlinear free-surface shallow-water flows, (ii) the construction of a new numerical approximation strategy for the simulation of nonlinear interactions between waves in a free-surface shallow flow and a partly immersed floating object. The stabilization methods developed in the first research line are used in the second part of this work.High-order discontinuous-Galerkin (DG) methods generally suffer from a lack of nonlinear stability in the presence of singularities in the solution. Such singularities may be of various kinds, involving discontinuities, rapidly varying gradients or the occurence of dry areas in the particular case of free-surface flows. In the first part of this work, we introduce two new stabilization methods based on the use of Finite-Volume Subcells in order to alleviate these robustness issues. The first method relies on an a priori limitation of the DG scheme, together with the use of a TVB slope-limiter and a PL. The second one is built upon an a posteriori correction strategy, allowing to surgically detect the incriminated local subcells, together with the robustness properties of the corresponding lowest-order Finite-Volume scheme. This last strategy allows to ensure the nonlinear stability of the DG scheme in the vicinity of discontinuities, as well as the positivity of the discrete water-height, while preserving the subcell resolution of the initial scheme. This second strategy is also preliminary investigated in the two dimensional horizontal case. An extensive set of test-cases assess the validity of this approach.In the second part, we introduce a new numerical strategy designed for the modeling and simulation of nonlinear interactions between surface waves in shallow-water and a partially immersed surface piercing object. At the continuous level, the flow located in the textit{exterior} domain is globally modeled with the nonlinear hyperbolic shallow-water equations, while the description of the flow beneath the object reduces to a nonlinear ordinary differential equation. The coupling between the flow and the object is formulated as a free-boundary problem, associated with the computation of the time evolution of the spatial locations of the air-water-body interface. At the discrete level, the proposed formulation relies on an arbitrary-order discontinuous Galerkin approximation, which is stabilized with the a posteriori Local Subcell Correction method through low-order finite volume scheme introduced in the first part. The time evolution of the air-water-body interface is computed from an Arbitrary-Lagrangian-Eulerian (ALE) description and a suitable smooth mapping between the original frame and the current configuration. For any order of polynomial approximation, the resulting algorithm is shown to: (1) preserves the Discrete Geometric Conservation Law, (2) ensures the preservation of the water-height positivity at the subcell level, (3) preserves the class of motionless steady states (well-balancing), possibly with the occurrence of a partially immersed object.Several numerical computations and test-cases are presented, highlighting that the proposed numerical model(1) effectively allows to model all types of wave / object interactions, (2) efficiently provides the time-evolution of the air-water-body contact points and accordingly redefine the new mesh-grid thanks to ALE method (3) accurately handles strong flow singularities without any robustness issues, (4) retains the highly accurate subcell resolution of discontinuous Galerkin schemes
6

Awassa, Jazia. "Mécanismes antibactériens des hydroxydes doubles lamellaires à base de zinc." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0155.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Les hydroxydes doubles lamellaires (HDL) sont des composés solides constitués par un ensemble de feuilles d'hydroxydes métalliques divalents M(II) et trivalents M(III) entre lesquels s’insèrent des anions et des molécules d’eau. En raison de la flexibilité des HDL en termes de propriétés physico-chimiques, l’étude des différents mécanismes antibactériens qui leurs sont associés présente un intérêt croissant. Ce travail de thèse vise à étudier différentes hypothèses proposées pour explique l'effet antibactérien des hydroxydes doubles lamellaire (HDL) à base de zinc : (1) interactions directes entre la surface des HDL et les parois bactériennes, (2) libération d'ions métalliques divalents en solution depuis les feuillets des HDL, (3) génération d'espèces réactives de l'oxygène (ROS). Lors d’une première étude, une investigation globale a été réalisée pour déterminer les différents paramètres physico-chimiques influençant l'activité antibactérienne des HDLs M(II)Al(III) (M= Zn, Cu, Ni, Co, Mg). L'effet antimicrobien des HDLs contre les bactéries Gram-positives Staphylococcus aureus et Gram-négatives Escherichia coli a été corrélé en premier lieu à la nature du métal divalent, et en second lieu à la quantité d'ions M2+aq libérés dans le milieu de culture. Cet effet était plus prononcé pour les HDLs à base de Zn(II) possédant la plus forte activité antibactérienne et dont les propriétés antibactériennes dépendent du profil de libération des ions Zn2+aq (Mécanisme 2) contrôlée initialement par les différents paramètres physico-chimiques étudiés. De plus, rôle du contact direct (Mécanisme 2) a été validé pour les HDLs à base de Zn(II) en comparant l'activité antibactérienne d’HDLs de taille micrométrique contre S. aureus à celle des nanoparticules (NPs) d’HDL présentant un effet antibactérien supérieur. La présence d'interactions spécifiques entre les HDLs à base de Zn(II) et la paroi de S. aureus a été validée par microscopie à force atomique en mode spectroscopie de force (AFM-FS). L'amélioration des propriétés antibactériennes des NPs d’HDL à base de Zn(II) par la génération de ROS (Mécanisme 3) en présence de lumière UVA a également été évaluée. Après avoir fourni des preuves expérimentales sur les trois mécanismes suggérés, la contribution de chaque mécanisme dans l'activité antibactérienne des HDLs à base de Zn(II) a été déterminé
Layered double hydroxides (LDH) are solid compounds constituted by the stacking of divalent M(II) and trivalent M(III) metal hydroxide sheets separated by an interlayer of anions and water molecules. Due to the versatility of LDH in terms of their tunable physico-chemical properties, a growing interest arises for investigating their different antibacterial activity mechanisms. This thesis work aims at studying the different proposed hypotheses explaining the antibacterial effect of pristine zinc-based LDHs: (1) direct interactions between the surface of LDH and bacterial cell walls, (2) release of constituent divalent metal ions, (3) generation of reactive oxygen species (ROS). First a global investigation was performed to determine the different physico-chemical parameters influencing the antibacterial activity of pristine M(II)Al(III) LDHs (M= Zn, Cu, Ni, Co, Mg). The antimicrobial effect of LDHs against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria was linked in the first place to the nature of divalent metal itself, and to the amount of released M2+aq ions into the culture media in the second place. This effect was more easily identified in Zn(II)-based LDHs possessing the strongest antibacterial activity and whose antibacterial properties depended on their release profile of Zn2+aq ions (Mechanism 2) initially controlled by the different physico-chemical parameters. Moreover, the direct contact mechanism (Mechanism 1) was validated for Zn(II)-based LDHs by comparing the antibacterial activity of micron-sized LDHs against S. aureus to that of LDH nanoparticles (NPs) exhibiting a greater antibacterial effect. The presence of specific surface interactions between Zn(II)-based LDHs and the cell wall of S. aureus was further validated by atomic force microscopy-based force spectroscopy (AFM-FS). The enhancement of the antibacterial properties of Zn(II)-based LDH NPs by ROS generation (Mechanism 3) in presence of UVA light was also assessed. After providing experimental evidences about the three suggested mechanisms, the role of each mechanism contributing to the antibacterial activity of Zn(II)-based LDHs in different antibacterial tests assays was determined
7

Neltner, Brian. "Creating selective directional interactions with defects caused by subnanometre-ordered ligand domains on the surface of colloidal metal nanoparticles for the purpose of directed self-assembly." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32848.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2005.
Includes bibliographical references (p. 42-43).
Introduction: The ability to utilize directional, specific bonds are a fundamental property of atoms which has allowed us to predictably create molecules of consistent geometry and composition for centuries. One fundamental difference between a true atom and a nanoparticle is that to date, nanoparticles do not possess this property.
by Brian Neltner.
S.B.
8

Rimbault, Charlotte. "Modulation des interactions impliquant les domaines PDZ par une approche d’évolution dirigée." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0438/document.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Les interactions protéine-protéine (IPPs), complexes et dynamiques, sont le cœur des réseaux protéiques cellulaires. Au niveau des synapses excitatrices, la densité post-synaptique (PSD) est un exemple typique de réseau protéique dont la structure et la composition à l’échelle nanoscopique détermine la fonction cellulaire. Ainsi, la régulation dynamique de la composition de la PSD et des mouvements des récepteurs au glutamate dans ou hors de la PSD constitue la base des théories moléculaires actuelles sur l’apprentissage et la mémoire. Dans ce contexte, durant ma thèse, j’ai étudié une classe d’IPPs faisant intervenir les domaines PDZ. En effet, durant ces dernières années, de nombreuses études ont démontré l’implication de ces interactions impliquant les domaines PDZ de la famille de PSD95 dans le ciblage synaptique et l’ancrage des récepteurs au glutamate. Cependant, en partie dû au manque d’outils adaptés, les mécanismes moléculaires sous-jacents qui contrôlent de façon dynamique leur rétention à la synapse restent mal compris. Dans le but d’étudier ces interactions impliquant des domaines PDZ, j’ai développé plusieurs stratégies de sélection par phage display basées sur l’utilisation du dixième domaine de type III de la fibronectine humaine (10Fn3) dans le but de cibler les motifs d’interaction aux domaines PDZ des récepteurs (Stargazin pour les rAMPA et GluN2A pour les rNMDA) ou les domaines PDZ eux-mêmes. En utilisant une approche multidisciplinaire, mes objectifs principaux ont été de concevoir de petits anticorps synthétiques qui nous permettront de rompre ou de stabiliser spécifiquement ces complexes protéiques, ainsi que d’observer les interactions endogènes
Complex and dynamic protein-protein interactions are the core of protein-based networks in cells. At excitatory synapses, the postsynaptic density (PSD) is a typical example of protein-based network whose nanoscale structure and composition determines the cellular function. For instance, the dynamic regulation of PSD composition and glutamate receptors movements into or out of the PSD are the base of current molecular theories of learning and memory. In this context, during my PhD, I focused on a class of protein-protein interactions mediated by PDZ domains. Indeed, over the last decade, numerous studies have shown the critical implication of PDZ domain-mediated interactions from the PSD95 scaffolding protein family in the synaptic targeting and anchoring of glutamate receptors. However, in part due to the lack of adapted tools, the molecular mechanisms that dynamically govern their respective synaptic retention remain poorly understood. In order to investigate these PDZ domain-mediated interactions, I developed several selection strategies by phage-display based on the fibronectin type III (FN3) scaffold in order to either target the PDZ domain-binding motifs of the receptors complexes (e.g., stargazin for AMPARs and GluN2A for NMDARs) or the PDZ domains themselves. Using a multidisciplinary approach, my main objectives were to engineer small synthetic antibodies that will allow us to acutely and specifically disrupt or stabilize these protein complexes, as well as monitor endogenous interactions
9

Took, Roger Kenton. "Surface interaction : separating direct manipulation interfaces from their applications." Thesis, University of York, 1990. http://etheses.whiterose.ac.uk/13997/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
To promote both quality and economy in the production of applications and their interactive interfaces, it is desirable to delay their mutual binding. The later the binding, the more separable the interface from its application. An ideally separated interface can factor tasks from a range of applications, can provide a level of independence from hardware I/O devices, and can be responsive to end-user requirements. Current interface systems base their separation on two different abstractions. In linguistic architectures, for example User Interface Management Systems in the Seeheim model, the dialogue or syntax of interaction is abstracted in a separate notation. In agent architectures like Toolkits, interactive devices, at various levels of complexity, are abstracted into a class or call hierarchy. This Thesis identifies an essential feature of the popular notion of direct manipulation: directness requires that the same object be used both for output and input. In practice this compromises the separation of both dialogue and devices. In addition, dialogue cannot usefully be abstracted from its application functionality, while device abstraction reduces the designer's expressive control by binding presentation style to application semantics. This Thesis proposes an alternative separation, based on the abstraction of the medium of interaction, together with a dedicated user agent which allows direct manipulation of the medium. This interactive medium is called the surface. The Thesis proposes two new models for the surface, the first of which has been implemented as Presenter, the second of which is an ideal design permitting document quality interfaces. The major contribution of the Thesis is a precise specification of an architecture (UMA), whereby a separated surface can preserve directness without binding in application semantics, and at the same time an application can express its semantics on the surface without needing to manage all the details of interaction. Thus UMA partitions interaction into Surface Interaction, and deep interaction. Surface Interaction factors a large portion of the task of maintaining a highly manipulable interface, and brings the roles of user and application designer closer.
10

Mohammad, Ali Monadjemi Shirin. "Phototransformation de matières actives à la surface des végétaux . Mécanismes des réactions directes et sensibilisées." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00836760.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
La phototransformation des matières actives à la surface des plantes après pulvérisation a une influence considérable sur l'efficacité des traitements. Dans ce travail, l'ensemble des réactions photochimiques se produisant sur des supports modèles des cires végétales dans des conditions proches des conditions environnementales ont été étudiées dans le cas d'un fongicide (le chlorothalonil) et d'un herbicide (la cycloxydime). Nous avons considéré les réactions photochimiques induites par l'absorption de lumière par les composés eux-mêmes et celles faisant intervenir des sensibilisateurs comme les métabolites secondaires des plantes. Dans chacun des cas, des études mécanistiques détaillées ont été conduites. Nous montrons que le chlorothalonil possède la capacité remarquable de produire de l'oxygène singulet avec un rendement quantique proche de l'unité. En parallèle, la réactivité de la cycloxydime avec l'oxygène singulet a été montrée. De ce fait, la phototransformation de la cycloxydime sur film de cire est accélérée lorsque des sensibilisateurs naturels, tels que les phytoalexines sont ajoutés à la cire, ou lorsque des traces de chlorothalonil sont présents à la surface du modèle foliaire. Ce travail a permis 1) de comprendre le mécanisme de phototransformation par excitation directe et sensibilisées du chlorothalonil et de la cycloxydime, 2) de mesurer de nombreuses données physico-chimiques (constantes de vitesse de réaction, rendements quantiques, durées de vie, caractéristiques spectrales des transitoires) et 3) de mettre au point un protocole expérimental permettant d'étudier la photochimie de molécules à l'état solide incluses dans des films de cire.
More sources

Books on the topic "Interactions directes de surface":

1

Ganeev, Rashid A. Laser - Surface Interactions. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7341-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Rein, Martin, ed. Drop-Surface Interactions. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-2594-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Martin, Rein, and International Centre for Mechanical Sciences., eds. Drop-surface interactions. Wien: Springer, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. High temperature surface interactions. Neuilly sur Seine, France: AGARD, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Díez Muiño, Ricardo, and Heriberto Fabio Busnengo, eds. Dynamics of Gas-Surface Interactions. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32955-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

1944-, Rabalais J. Wayne, ed. Low energy ion-surface interactions. Chichester: J. Wiley, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Billing, Gert D. Dynamics of molecule surface interactions. New York: Wiley, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Mazumder, Rajat, and Rajib Shaw, eds. Surface Environments and Human Interactions. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0112-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Agbormbai, Adolf A. Reciprocity theory of gas surface interactions. [London, England]: Imperial College of Science, Technology and Medicine. Dept. of Aeronautics, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Dyall, Kenneth G. Theoretical investigation of gas-surface interactions. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Interactions directes de surface":

1

Augusti-Tocco, Gabriella. "Cell Surface Components and Differentiation in Neuroblastoma Culture." In Cellular and Molecular Control of Direct Cell Interactions, 271–82. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-5092-7_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Schiele, Nathan R., David T. Corr, and Douglas B. Chrisey. "Laser Direct Writing of Idealized Cellular and Biologic Constructs for Tissue Engineering and Regenerative Medicine." In Laser-Surface Interactions for New Materials Production, 261–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03307-0_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Horiuchi, Shin. "Interfacial Phenomena in Adhesion and Adhesive Bonding Investigated by Electron Microscopy." In Interfacial Phenomena in Adhesion and Adhesive Bonding, 113–207. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4456-9_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
AbstractUsing electron microscopy techniques described in Chap. 2, we investigate interfacial phenomena in adhesion and adhesive bonding. Polymer–polymer interfaces formed via interdiffusion are visualized and characterized by EFTEM. Fractographic studies using high-resolution SEM investigate entanglements at the polymer–polymer interfaces, and the adhesion mechanism is discussed about the interfacial entanglements. The effect of surface treatments of polymers for adhesion improvement is studied in terms of the surface roughness and the chemical functionality of the adherend created by the surface pretreatments. We then describe the role of chemical interactions between polymers and metals on bonding by the analysis of fracture surfaces by the STEM-replica technique. Bonding mechanisms of adhesive bonding and recently developed direct bonding of metal and plastic are also investigated by STEM-EELS/ELNES and STEM-tomography. Finally, we evaluate the toughness and durability of adhesive joints between metal and carbon fiber reinforced plastics (CFRP) and discuss the durability of the adhesive bonding.
4

Yan Shan, Ang. "DNA Split Proximity Circuit for Visualizing Cell Surface Receptor Clustering—A Case Study Using Human Epidermal Growth Factor Receptor Family." In Engineering a Robust DNA Circuit for the Direct Detection of Biomolecular Interactions, 143–56. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2188-7_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Hopman, H. J. "Hydrogen-Surface Interactions." In Nonequilibrium Processes in Partially Ionized Gases, 241–50. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3780-9_13.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Grimley, T. B. "Gas-Surface Interactions." In Interaction of Atoms and Molecules with Solid Surfaces, 25–52. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-8777-0_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Livingston, Megan, and F. Kurtis Kasper. "Cell–Surface Interactions." In Cell Culture Technology, 107–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74854-2_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Adamczyk, Zbigniew. "Specific Surface Interactions." In Encyclopedia of Colloid and Interface Science, 1047. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_177.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ciraci, S. "Tip- Surface Interactions." In Scanning Tunneling Microscopy and Related Methods, 113–41. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-015-7871-4_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

van Emmichoven, P. A. Zeijlmans. "Ion-Surface Interactions." In NATO ASI Series, 263–89. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-1412-5_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Interactions directes de surface":

1

Forsström, Jennie, Malin Eriksson, and Lars Wågberg. "Molecular Interactions between Model Cellulose Surfaces and Ink – Influence of Surface Energy and Surface Structure on Adhesion." In Advances in Paper Science and Technology, edited by S. J. I’Anson. Fundamental Research Committee (FRC), Manchester, 2005. http://dx.doi.org/10.15376/frc.2005.2.1379.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The influence of surface roughness and surface hydrophobicity on ink detachment of water-based flexographic ink was studied. It was shown that increased surface roughness and an increased surface hydrophobicity both had a negative effect on ink detachment. The increased surface roughness was suggested to increase the molecular contact area between ink and cellulose and thereby also to decrease ink detachment. Ink cellulose interaction was evaluated from interfacial energies and contact angle measurements. A new technique in which the adhesion properties between ink and the model cellulose surface were directly measured using a Micro Adhesion Measurement Apparatus (MAMA) was also used. Upon increasing the hydrophobicity of the model cellulose surface it was shown that the work of adhesion between ink and model cellulose surfaces decreased. At the same time the interfacial energy between cellulose and ink increased, as did the interfacial energy between cellulose and water resulting in a lower degree of ink detachment.
2

Shinn, Neal D. "Adsorbate Interactions and Poisoning on Cr(110)." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/msba.1987.wc6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The chemisorption of carbon monoxide and oxygen on Cr(110) at temperatures below 150K has been studied using photoemission, vibrational and Auger spectroscopies, and low energy electron diffraction (LEED). Direct evidence for co-adsorbate interactions which induce changes in the (1) molecular CO bonding to the chromium surface and (2) the CO dissociation energetics has been found. This work provides a microscopic picture of the "poisoning" of the Cr(110) surface for CO dissociation by electronegative oxygen atoms.
3

D'Souza, Brian, and Andrew Ketsdever. "Direct Impulse Measurements of Ablation Processes from Laser-Surface Interactions." In 36th AIAA Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5172.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ganapathy, Harish, V. Emlin, Anant Narendra Parikh, and V. Sajith. "Experimental Investigation on Surface Particle Interactions During Pool Boiling of Nanofluids." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58180.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The pool boiling characteristics of nanofluids is affected by the interaction between the nanoparticles and the heater surface which forms a sorption layer and this layer increases the surface wettability and thereby enhances the CHF. While deteriorated nucleate boiling has been attributed to the decreased activation of cavities due to the increased wettability, it fails to explain the enhanced performance observed by several researchers, which can be explained only by an increase in surface roughness and hence a direct increase in the number of cavities, thereby compensating for the increase in wettability. Attempts to characterize the roughness of heater surfaces have been restricted to magnified visualizations and intrusive probing. No non-intrusive tests have been reported on flat heaters, which are ideal to conduct surface analyses. The present work is aimed at conducting a non-intrusive experimental study to analyse the surface roughness modification due to the sorption layer on flat plate heaters. Experiments have been carried out using electro-stabilized aluminium oxide water based nanofluids of different concentrations with heaters having varying values of surface roughness. The burn-out heat flux was measured and the effect of sedimentation time was studied. The surface-particle interaction parameter (Ra/dp) was varied to capture the phenomena of plugging as well as splitting of nucleation sites. An experiment having a high value of the interaction parameter shows enhanced boiling performance and that with a value close to 1 shows deteriorated performance. Further it was seen that this behaviour is dependent on the particle concentration. Detailed surface characterization has been done using an optical measurements setup and atomic force microscopy. Boiling on nano-coated heaters has been investigated and presented as an effective solution to counter the disadvantageous transient boiling behavior of nanofluids.
5

Marsh, Eugene P., Terry L. Gilton, Wolfgang Meier, Mark R. Schneider, and J. P. Cowin. "Electron-Transfer Mediated and Direct Surface Photochemistry: CH3Cl on Ni(111)." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/msba.1989.tub2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
In the photochemistry of molecules on a metal or semiconductor, the surface can play a very important role by strongly perturbing, promoting or inhibiting the process.(1) Excitation to repulsive states is an important class of surface photochemical processes as they are: simple, bond specific, produce important reactive radicals, and are fast enough (5 to 100 fs) to largely escape electronic quenching due to surface interactions. However, charge transfer processes are still fast enough to perturb or dominate on this time scale.(2)
6

Adila, Ahmed S., Mahmoud Aboushanab, Ahmed Fathy, and Muhammad Arif. "An Experimental Investigation of Surface Chemistry of Rocks in the Presence of Surfactants." In GOTECH. SPE, 2024. http://dx.doi.org/10.2118/219143-ms.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Surfactant flooding is a well-known chemical enhanced oil recovery (cEOR) technique. However, surfactant surface chemistry and the associated interactions with rock surfaces are complex and have not been fully investigated. Here, we experimentally investigate the surface chemistry of 15 rock surfaces (10 carbonate and 5 sandstones) upon interaction with different types of surfactants, including cationic, anionic, non-ionic, and zwitterionic surfactants at different concentrations (before, at, and after the critical micelle concentration, CMC). The rock samples were examined using Scanning Electron Microscopy (SEM) to investigate their structure and surface morphology. To understand the interactions at the surfactant-mineral interface and surfactant behavior, the zeta potential measurements of surfactant-brine-rock emulsions were performed, while surface chemical functional groups were identified by Fourier-transform infrared (FTIR) spectroscopy. The zeta potential results show that both anionic (SDS) and cationic (CTAB) surfactants depict better stability, in carbonates and sandstones, compared to the non-ionic (Triton X-100) and zwitterionic (3- (N, N-Dimethylmyristylammonio) surfactants, which is due to the nature of the charge of each surfactant. Also, the FITR results indicate the existence of different chemical bonds and functional groups at different concentrations for each surfactant type, and the magnitude of these bonds differs as a function of rock type and mineralogy. For instance, the rock samples treated with CTAB cationic surfactant reveal the presence of C-O, Mg-C, and Ca-C groups at all concentrations. However, despite being present at all concentrations, these responses show different magnitudes at different surfactant concentrations. The results of this study provide valuable data set to understand the surfactant surface chemistry interactions with different carbonate and sandstone rock surfaces and thus have direct implications for chemical enhanced oil recovery.
7

Kunkle, Claire M., and Van P. Carey. "Metrics for Quantifying Surface Wetting Effects on Vaporization Processes at Nanostructured Hydrophilic Surfaces." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7203.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
A static contact angle is most often used as a means of quantifying the wetting characteristics of the liquid phase in vaporization processes at a solid surface. This metric is often convenient to measure and intuitive in its interpretation, but when a surface is superhydrophilic, the resulting low contact angles are difficult to measure accurately from photographs of sessile droplet profiles or contact line regions. For droplets at ultra low contact angles, small changes of contact angle can produce very large changes in wetted surface area, which makes small uncertainties in contact angle result in large uncertainties in wetted area. For hydrophilic nanostructured surfaces, another disadvantage is that the relationship of the macroscopic (apparent) contact angle to the nanoscale interaction of the liquid and vapor contact line with the nanostructured surface is not always clear. In this study, a new wetting metric based on spreading characteristics of sessile droplets is proposed that can be easily measured for hydrophilic surfaces. This metric also has the advantage that it is a more direct and sensitive indicator of how a droplet spreads on the surface. The spread area directly impacts heat transfer interactions between the droplet and the surface, therefore affecting evaporation time. Consequently, a metric that more directly illustrates the spread area provides an indication of how the wetting will affect these mechanisms. Use of the proposed new metric is explored in the context of evaporation and boiling applications with superhydrophilic surfaces. Characteristics of this metric are also compared to static contact angle and other choices of wetting metrics suggested in earlier studies, such as dynamic advancing and receding contact angles, and spreading coefficients. The effects of nanoscale structure and/or roughness on the proposed wetting metric are analyzed in detail. A model is developed that predicts the dependence of the proposed wetting parameter on intrinsic material wettability for rough, nano-structured surfaces. The model results demonstrate that the proposed metric is a more sensitive indicator of macroscopic wetting behavior than apparent contact angle when the surface is superhydrophilic. This characteristic of the proposed new metric is shown to have advantages over other wetting metrics in the specific case of superhydrophilic nanostructured surfaces. Application of the proposed wetting metric is demonstrated for some example nanostructured surfaces. The results of our study indicate that this proposed new metric can be particularly useful for characterizing the effects of variable wetting on vaporization processes on highly wetted nanostructured surfaces.
8

Neuman, Ronald D. "Surface Force Measurement in Papermaking Systems." In Products of Papermaking, edited by C. F. Baker. Fundamental Research Committee (FRC), Manchester, 1993. http://dx.doi.org/10.15376/frc.1993.2.969.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The surface force technique, whereby the forces acting between two solid surfaces immersed in liquids or in adhesive contact are directly measured, represents a novel approach for both fundamental and application-oriented studies of the surface and colloid science of papermaking. The nature and measurement of surface forces are briefly discussed, and some results reported for mica surfaces are reviewed in order to illustrate the surface chemical information obtainable using a conventional Israelachvili-type surface force apparatus. In the case of cellulose surfaces immersed in water and aqueous electrolyte solutions the measured force vs. distance profile is characterized by three regimes. Significantly, conventional DLVO theory cannot explain the interaction forces measured between cellulose surfaces. Electrostatic double-layer forces, as anticipated, dominate the long-range interactions. However, as the two cellulose surfaces begin to “contact” each other, there is an interplay of steric and electrostatic forces due to dangling tails of cellulose chains. The observed force curves, therefore, are interpreted in terms of a new model — the “dangling tail” model — of the cellulose surface, namely, the water-swollen cellulose surface has long and weakly charged cellulose chains or “molecularfibrils” which extend into the aqueous solution. In addition, the application of the surface force technique to basic problems in the adsorption of polymers, both cationic polyelectrolytes and hemicelluloses, and the colloidal stability of kaolin suspensions is illustrated. The advantages of using a new type of surface force apparatus in future studies of surface and physicochemical phenomena relevant to paper manufacturing, coating and recycling are also briefly discussed.
9

Atwater, H. A., C. J. Tsai, and T. Vreeland. "Coherent Strain Changes in Si-Ge Alloys Grown By Ion-Assisted Molecular Beam Epitaxy." In The Microphysics of Surfaces: Beam-Induced Processes. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/msbip.1991.ma3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Although low energy ion bombardment has been employed in various contexts during epitaxial growth, such as enhanced dopant incorporationfl], surface cleaning during plasma-enhanced chemical vapor deposition[2], and direct low energy ion beam deposition[3,4], key questions about the interaction of low energy ions with growing surfaces remain unanswered. Improved understanding of ion-surface interactions during growth may yield additional elements of control over epitaxial film structure, strain state, and composition. Of particular interest for high quality epitaxial films is the identification of the regime in which surface and near-surface processes, such as surface diffusion and incorporation at growth sites, can be enhanced at low temperatures while avoiding or controlling damage in the deposited films.
10

Higashi, G. S., L. J. Rothberg, and C. G. Fleming. "Studies of Laser Chemical Vapor Deposition Using Surface Sensitive Infrared Photoacoustic Spectroscopy." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/msba.1985.tuc3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
We report vibrational spectra of surface adsorbates during KrF laser assisted chemical vapor deposition (CVD) of Al films from trimethylaluminum (TMA) on single crystal sapphire substrates. The pulsed optoacoustic technique used has submonolayer sensitivity to O-H and C-H infrared active stretching vibrations and allows studies of the interactions between adsorbed H2O and TMA on surfaces prior to deposition. It also provides information about film composition during the early stages of laser stimulated growth. In addition, because surface Al-CH3 groups can be observed directly, the role of surface phase photochemistry in laser CVD can be investigated.

Reports on the topic "Interactions directes de surface":

1

D'Souza, Brian, and Andrew Ketsdever. Direct Impulse Measurements of Ablation Processes from Laser-Surface Interactions. Fort Belvoir, VA: Defense Technical Information Center, May 2005. http://dx.doi.org/10.21236/ada435844.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Procassini, R. J., and B. I. Cohen. The DIPSI (Direct Implicit Plasma Surface Interactions) computer code user's manual. Office of Scientific and Technical Information (OSTI), June 1990. http://dx.doi.org/10.2172/7185616.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

McClure, Michael A., Yitzhak Spiegel, David M. Bird, R. Salomon, and R. H. C. Curtis. Functional Analysis of Root-Knot Nematode Surface Coat Proteins to Develop Rational Targets for Plantibodies. United States Department of Agriculture, October 2001. http://dx.doi.org/10.32747/2001.7575284.bard.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The goal of this research was to provide a better understanding of the interface between root-knot nematodes, Meloidogyne spp., and their host in order to develop rational targets for plantibodies and other novel methods of nematode control directed against the nematode surface coat (SC). Specific objectives were: 1. To produce additional monoclonal SC antibodies for use in Objectives 2, 3, and 4 and as candidates for development of plantibodies. 2. To determine the production and distribution of SC proteins during the infection process. 3. To use biochemical and immunological methods to perturbate the root-knot nematode SC in order to identify SC components that will serve as targets for rationally designed plantibodies. 4. To develop SC-mutant nematodes as additional tools for defining the role of the SC during infection. The external cuticular layer of nematodes is the epicuticle. In many nematodes, it is covered by a fuzzy material termed "surface coat" (SC). Since the SC is the outermost layer, it may playa role in the interaction between the nematode and its surroundings during all life stages in soil and during pathogenesis. The SC is composed mainly of proteins, carbohydrates (which can be part of glycoproteins), and lipids. SC proteins and glycoproteins have been labeled and extracted from preparasitic second-stage juveniles and adult females of Meloidogyne and specific antibodies have been raised against surface antigens. Antibodies can be used to gain more information about surface function and to isolate genes encoding for surface antigens. Characterization of surface antigens and their roles in different life-stages may be an important step towards the development of alternative control. Nevertheless, the role of the plant- parasitic nematode's surface in plant-nematode interaction is still not understood. Carbohydrates or carbohydrate-recognition domains (CROs) on the nematode surface may interact with CROs or carbohydrate molecules, on root surfaces or exudates, or be active after the nematode has penetrated into the root. Surface antigens undoubtedly play an important role in interactions with microorganisms that adhere to the nematodes. Polyclonal (PC) and monoclonal (MC) antibodies raised against Meloidogyne javanica, M. incognita and other plant-parasitic nematodes, were used to characterize the surface coat and secreted-excreted products of M. javanica and M. incognita. Some of the MC and PC antibodies raised against M. incognita showed cross-reactivity with the surface coat of M. javanica. Further characterization, in planta, of the epitopes recognized by the antibodies, showed that they were present in the parasitic juvenile stages and that the surface coat is shed during root penetration by the nematode and its migration between root cells. At the molecular level, we have followed two lines of experimentation. The first has been to identify genes encoding surface coat (SC) molecules, and we have isolated and characterized a small family of mucin genes from M. incognita. Our second approach has been to study host genes that respond to the nematode, and in particular, to the SC. Our previous work has identified a large suite of genes expressed in Lycopersicon esculentum giant cells, including the partial cDNA clone DB#131, which encodes a serine/threonine protein kinase. Isolation and predicted translation of the mature cDNA revealed a frame shift mutation in the translated region of nematode sensitive plants. By using primers homologous to conserved region of DB#131 we have identified the orthologues from three (nematode-resistant) Lycopersicon peruvianum strains and found that these plants lacked the mutation.
4

Chefetz, Benny, Baoshan Xing, and Yona Chen. Interactions of engineered nanoparticles with dissolved organic matter (DOM) and organic contaminants in water. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7699863.bard.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Background: Engineered carbon nanotubes (CNTs) are expected to be increasingly released into the environment with the rapid increase in their production and use. The discharged CNTs may interact with coexisting contaminants and subsequently change environmental behaviors and ecological effects of both the CNTs themselves and the contaminants. Dissolved organic matter (DOM) plays a critical role in the transport of CNTs in the aquatic environment, affecting both CNT's surface properties through adsorption, and its colloidal stability in solution. Therefore, CNT-bound DOM complexes may interact with coexisting contaminants, thus affecting their environmental fate. With increasing production and use of CNTs, there is an increasing risk that humans could be exposed to CNTs mainly through ingestion and inhalation. Since CNTs can be carriers of contaminants due to their high adsorption affinity and capacity, the distribution of these nanoparticles in the environment holds a potential environmental and health risk. Project objectives: The overall goal of this project was to gain a better understanding of the environmental behavior of engineered nanoparticles with DOM and organic pollutant in aqueous systems. The scope of this study includes: characterizing various types of engineered nanoparticles and their interaction with DOM; binding studies of organic contaminants by nanoparticles and DOM-nanoparticle complexes; and examining interactions in DOM-nanoparticles-contaminant systems. Major conclusions, solutions and achievements: DOM has a pronounced effect on colloidal stability of CNTs in solution and on their surface chemistry and reactivity toward associated contaminants. The structure and chemical makeup of both CNTs and DOM determine their interactions and nature of formed complexes. CNTs, contaminants and DOM can co-occur in the aquatic environment. The occurrence of co-contaminants, as well as of co-introduction of DOM, was found to suppress the adsorption of organic contaminants to CNTs through both competition over adsorption sites and direct interactions in solution. Furthermore, the release of residual contaminants from CNTs could be enhanced by biomolecules found in the digestive as well as the respiratory tracts, thus increasing the bioaccessibility of adsorbed contaminants and possibly the overall toxicity of contaminant-associated CNTs. Contaminant desorption could be promoted by both solubilization and sorptive competition by biological surfactants. Scientific and agricultural implications: The information gained in the current project may assist in predicting the transport and fate of both CNTs and associated contaminants in the natural environment. Furthermore, the results imply a serious health risk from contaminant-associated CNTs.
5

FEIBELMAN, PETER J. Fundamental Studies of Water-Surface Interactions. Office of Scientific and Technical Information (OSTI), November 2001. http://dx.doi.org/10.2172/789597.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sinclair, Michael B., Todd W. Lane, Howland D. T. Jones, Roberto Rebeil, Susan Jeanne Altman, Julie Kaiser, Lucas K. McGrath, and Caroline Ann Souza. Exploratory research into pathogen surface interactions. Office of Scientific and Technical Information (OSTI), February 2006. http://dx.doi.org/10.2172/877739.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Webb, Lauren J. Electrostatic Control of Protein-Surface Interactions. Fort Belvoir, VA: Defense Technical Information Center, October 2013. http://dx.doi.org/10.21236/ada597412.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hinton, M. J. Groundwater-surface water interactions in Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/291372.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Strakowski, J., T. Renic, and J. Clark. Wetland surface and groundwater interactions monitoring program. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/299801.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Murray, P. T. Threshold Electron Studies of Gas-Surface Interactions. Fort Belvoir, VA: Defense Technical Information Center, January 1985. http://dx.doi.org/10.21236/ada151271.

Full text
APA, Harvard, Vancouver, ISO, and other styles

To the bibliography