Tesis sobre el tema "Electrostatic assemblies"
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Shipway, Jennifer Mary. "Coiled coils : electrostatics & macromolecular assemblies". Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250122.
Texto completoLoth, Capucine. "Exploring hydrogels based on the self-assembly of a Fmoc-based tripeptide : physicochemical characterization and antibacterial properties". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAE002.
Texto completoHydrogels are 3D networks of fibers that retain large amounts of water when swollen. Due to their biocompatibility, they are increasingly used for drug delivery. To develop antibacterial peptide-based hydrogels, this dissertation presents two studies based on the use of a fluorenylmethoxycarbonyl (Fmoc)-protected phosphorylated tripeptide that can self-assemble into a hydrogel. In the first study, different preparation conditions (pH, salt, presence of polysaccharide) were investigated to obtain a self-healing and antibacterial hydrogel capable of releasing an antibiotic, florfenicol. In the second study, a solid-phase peptide and phosphoramidite synthesis strategies were combined to add florfenicol to the Fmoc-protected tyrosine phosphate via a phosphodiester, which can be cleaved by nucleases produced by bacteria. Encouraging results showed the formation of the targeted compound, paving the way for the design of a self-defensive antibacterial peptide
Godbout, Lynda. "Atomic force microscopy studies on the electrostatic environment and energy levels of self-assembled quantum dots". Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=96933.
Texto completoLa propriété qu'ont les points quantiques de confiner des charges élémentaires à des niveaux discrets d'énergie en font une plate-forme prometteuse pour la conception de nouveaux appareils électroniques et opto-électroniques. Les points quantiques auto-assemblés sont d'autant plus intéressants puisque leur taille, forme et matériau peuvent être contrôlés lors de leur croissance. Ces propriétés influencent le potentiel de confinement modifiant ainsi les niveaux d'énergies du point quantique. Toutefois, cette méthode de croissance ne permet pas de positionner les points quantiques et ceux-ci se retrouvent distribués aléatoirement sur la surface de l'échantillon. Cela rend difficile l'accès aux points quantiques par des techniques lithographiques pour effectuer des mesures de transport ou de détection de charge permettant d'en déterminer les propriétés.Un microscope à force atomique (AFM) permet d'accéder spatialement à des points quantiques individuels et en appliquant une tension électrique entre la pointe du cantilever et une électrode arrière, leurs niveaux d'énergies peuvent être mesurés au fur et à mesure que des électrons sont ajoutés dans un régime de blocage de Coulomb. Dans ces expériences, le cantilever oscillant est responsable simultanément du chargement des points par l'application d'une tension de grille et de la détection du passage d'électron par « effet tunnel » par un changement de fréquence de résonance et/ou de dissipation du cantilever.Nous utilisons un AFM pour mesurer les niveaux d'énergie dans des points quantiques à quelques électrons d'InAs auto-assemblés. L'énergie de chargement, l'espacement des niveaux et la configuration électronique de points individuels sont obtenus expérimentalement. Nous comparons nos résultats à un modèle théorique qui décrit en détail le mécanisme derrière l'interaction électrostatique dissipative due au passage d'électrons par « effet tunnel ».Des exemples de l'influence électrostatique de l'environnement sur les points quantiques sont aussi présentés, ainsi qu'une méthode pour utiliser l'AFM pour caractériser le bruit électrostatique. Les fluctuations de charge sont connues pour compromettre le bon fonctionnement des appareils électroniques et particulièrement des composants micro et nanométriques. L'irradiation de larges bandes d'énergie interdites produit un bruit de génération et de recombinaison à la surface de l'échantillon, mais pas sur les points quantiques auto-assemblés. Nous mesurons ce bruit avec un AFM et comparons les résultats obtenus sur la surface du point quantique et en dehors en démontrant qu'une résolution spatiale inférieure à 20 nm est réalisée. Nous démontrons ainsi qu'un AFM permet de caractériser le bruit provenant des fluctuations de charge d'un échantillon avec une haute résolution spatiale.
Schkolnik, Gal [Verfasser] y Peter [Akademischer Betreuer] Hildebrandt. "Vibrational Stark Spectroscopy as a Tool for Probing Electrostatics at Protein Surfaces and Self Assembled Monolayers / Gal Schkolnik. Betreuer: Peter Hildebrandt". Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1028912951/34.
Texto completoTicha, Lawrence Awa. "Development of amperometric biosensor with cyclopentadienylruthenium (II) thiolato schiff base self-assembled monolayer (SAM) on gold". Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_5394_1341319478.
Texto completo5-C2H5]2 was synthesized and deposited as a selfassembled monolayer (SAM) on a gold electrode. Effective electronic communication between the Ru(II) centers and the gold electrode was established by electrostatically cycling the Shiff base-doped gold electrode in 0.1 M NaOH from -200 mV to +600 mV. The SAMmodified gold electrode (Au/SAM) exhibited quasi-reversible electrochemistry. The integrity of this electro-catalytic SAM, with respect to its ability to block and electro-catalyze certain Faradaic processes, was interrogated using Cyclic and Osteryoung Square Wave voltammetric experiments. The formal potential, E0', varied with pH to give a slope of about - 34 mV pH-1. The surface concentration, &Gamma
, of the ruthenium redox centers was found to be 1.591 x 10-11 mol cm-2. By electrostatically doping the Au/SAM/Horseradish peroxidase at an applied potential of +700 mV vs Ag/AgCl, a biosensor was produced for the amperometric analysis of hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide. The electrocatalytic-type biosensors displayed typical Michaelis-Menten kinetics with their limits of detection of 6.45 &mu
M, 6.92 &mu
M and 7.01 &mu
M for hydrogen peroxide, cumene hydroperoxide and tert-butylhydroperoxide respectively.
Degefa, Tesfaye Hailu. ""Ion channel (mimetic) sensors" mechanism of charge propagation through thiol-, protein- and dendrimer-modified electrodes /". Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=980218624.
Texto completoKelley, John Joseph. "Controlling Gold Nanoparticle Assembly through Particle-Particle and Particle-Surface Interactions". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1533083850424849.
Texto completo"The formation of chiral nanopatterns on low-dimensional ionic assemblies via electrostatic interactions". NORTHWESTERN UNIVERSITY, 2010. http://pqdtopen.proquest.com/#viewpdf?dispub=3386524.
Texto completoLee, Shu-Jhang y 李書彰. "Coupled mechanisms and pull-in instabilities of assemblies composed of coupled elastic-electrodes, subjected to electrostatic force". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/90826850400069105680.
Texto completo崑山科技大學
機械與能源工程研究所
105
The mathematical model of the coupled system composed of two elastically restrained beams and probe-membrane (probe-ring typed membrane) system subjected to electrostatic force is constructed. It is different to the conventional clamped micro/nano actuator which is constructed by two independent fixed/mobile conducting electrodes. The formula of pull-in voltage is presented. The analytical method for the coupled vibration is presented. (1) the coupling system is only affected by the DC voltage. It is found that the critical ratio of the relative static displacement of the general system to the initial tip distance is 1/3. In the critical condition, pull-in instabilities will occur. In addition, a general formula for traction voltage is found. This is very helpful in designing micro / nano actuators, since the introduction voltage can be directly calculated by the formula. The relationship between the coupling frequency of the general system and the frequency of the individual beams is also found. (2) the effects of several parameters on the pull-in instability are studied. The analytical method for the coupled vibration is proposed. The effects of the probe tips and several differential boundary conditions of membrane on the coupled characteristics are investigated. The coupled characteristic mechanism is clearly described.
Hyde, Gary Kevin. "Electrostatic self-assembled nanolayers on textile fibers". 2005. http://www.lib.ncsu.edu/theses/available/etd-04182005-123134/unrestricted/etd.pdf.
Texto completoDing, Tian-Shyng y 丁天行. "Electrostatic Assembled Silica Nanocomposite for Tumor-targeted Photodynamic Therapy". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/s67m6q.
Texto completo國立交通大學
應用化學系碩博士班
103
Conventional cancer treatments have many limitations which often fail to completely eradicate the tumor and cause damages to normal cells. Photodynamic therapy (PDT), by the excitation of photosensitizers with light to generate reactive oxygen species (ROSs) such as 1O2, has emerged as a noninvasive technique for cancer theranostics. However, the clinical use of many photosensitizers has been challenged by their nonspecific damage to normal tissues, environmental degradation and hydrophobicity...etc. To overcome the existing limitation and to enhance the selectivity of photodynamic therapy, we developed a simple electrostatic adsorption strategy to fabricate silica nanocomposite (Apt-MB-Si NPs) by sequentially functionalizing MUC1 aptamer for tumor targeting and hydrophilic photosensitizer methylene blue (MB) for the PDT application. We found effective generation of singlet oxygen could be achieved with low PS dosage and short irradiation time by current strategy.
Fogden, Andrew. "Physics and mathematics of interfaces in self-assemblies : studies in electrostatics and triply periodic minimal surfaces". Phd thesis, 1991. http://hdl.handle.net/1885/138301.
Texto completoPark, Jinseon. "Characterization Of The Local Electrical Environment In An Electrically-guided Protein Patterning System Incorporating Antifouling Self-assembled Monolayer". Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8520.
Texto completoYang, Cheng-Che y 楊政哲. "Self-Assembled Structures of the Electrostatic Complex of DNA with Cationic Dendrimer of Intermediate Generation: Small Angle Scattering Study". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/74462752320669360246.
Texto completo國立清華大學
化學工程學系
102
Polyamidoamine (PAMAM) dednrimer bearing well-defined number of amine groups can be protonated under physiological or acidic condition to generate the macrocations capable of forming electrostatic complex (called “dendriplex”) with DNA for gene delivery. Using small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS), here we constructed the morphological map of the complex of DNA with PAMAM dendrimer of generation four (G4) in terms of the dendrimer charge density and the nominal N/P ratio given by the feed molar ratio of dendrimer amine group to DNA phosphate group. With the increase of dendrimer charge density under a given nominal N/P ratio, the structure was found to transform from square columnar phase (in which the DNA chains packed in square lattice were locally straightened) to hexagonally-packed DNA superhelices (in which the DNA chains organizing in a hexagonal lattice twisted moderately into superhelices) and finally to beads-on-string structure (in which DNA wrapped around the dendrimer to form nuclesome-like array). The phase transition sequence was understood from the balance between the bending energy of DNA and the free energy of charge matching governed by the entropic gain from counterion release. Decreasing nominal N/P ratio under fixed dendrimer charge density was found to exert the same effect as increasing dendrimer charge density; that is, the structure with higher DNA curvature tended to form at lower nominal N/P ratio, in particular for the dendriplex with low dendrimer charge density. The effect of N/P ratio was attributed to the tendency of the system to increase the translational entropy of the counterions released to the bulk solution by reducing the concentration of free DNA or dendrimer remained in the solution. The experimental results presented here thus demonstrated the crucial role of counterion entropy in the structural formation of DNA-dendrimer complexes, and this entropic contribution was governed by the dendrimer charge density, the nominal N/P ratio, and the initial concentrations of DNA and dendrimer used for complex preparation. The dominant role of counterion entropy was further verified by examining the effect of protonic acid on the nanostructure of the dendriplex, where the dendrimer was also protonated by multivalent acids, including H2SO4 and H3PO4.
Strydom, Schalk Johannes. "Application of nanocoatings produced by electrostatic layer-by-layer self-assembling to improve the physicochemical properties of drugs and excipients / Schalk Johannes Strydom". Thesis, 2014. http://hdl.handle.net/10394/15588.
Texto completoPhD (Pharmaceutics), North-West University, Potchefstroom Campus, 2015
Ticha, Lawrence Awa. "Development of amperometric biosensor with Cyclopentadienylruthenium(ii) thiolato schiff base selfassembled Monolayer (sam) on gold". Thesis, 2007. http://hdl.handle.net/11394/3124.
Texto completoMagister Scientiae - MSc