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Literatura académica sobre el tema "Self-assembly in water"

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Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Self-assembly in water"

Mincheng Zhong, Mincheng Zhong, Ziqiang Wang Ziqiang Wang y and Yinmei Li and Yinmei Li. "Laser-accelerated self-assembly of colloidal particles at the water–air interface". Chinese Optics Letters 15, n.º 5 (2017): 051401–51405. http://dx.doi.org/10.3788/col201715.051401.

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Rogalska, E., M. Rogalski, T. Gulik-Krzywicki, A. Gulik y C. Chipot. "Self-assembly of chlorophenols in water". Proceedings of the National Academy of Sciences 96, n.º 12 (8 de junio de 1999): 6577–80. http://dx.doi.org/10.1073/pnas.96.12.6577.

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Roger, Kevin, Marianne Liebi, Jimmy Heimdal, Quoc Dat Pham y Emma Sparr. "Controlling water evaporation through self-assembly". Proceedings of the National Academy of Sciences 113, n.º 37 (29 de agosto de 2016): 10275–80. http://dx.doi.org/10.1073/pnas.1604134113.

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Water evaporation concerns all land-living organisms, as ambient air is dryer than their corresponding equilibrium humidity. Contrarily to plants, mammals are covered with a skin that not only hinders evaporation but also maintains its rate at a nearly constant value, independently of air humidity. Here, we show that simple amphiphiles/water systems reproduce this behavior, which suggests a common underlying mechanism originating from responding self-assembly structures. The composition and structure gradients arising from the evaporation process were characterized using optical microscopy, infrared microscopy, and small-angle X-ray scattering. We observed a thin and dry outer phase that responds to changes in air humidity by increasing its thickness as the air becomes dryer, which decreases its permeability to water, thus counterbalancing the increase in the evaporation driving force. This thin and dry outer phase therefore shields the systems from humidity variations. Such a feedback loop achieves a homeostatic regulation of water evaporation.

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SMIT, B., P. A. J. HILBERS y K. ESSELINK. "COMPUTER SIMULATIONS OF SURFACTANT SELF ASSEMBLY". International Journal of Modern Physics C 04, n.º 02 (abril de 1993): 393–400. http://dx.doi.org/10.1142/s0129183193000422.

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A simple oil/water/surfactant model is used to study the self-assembly of surfactants. The model contains only the most obvious elements: oil and water do not mix, and a surfactant is an amphiphilic molecule, i.e. one side of the molecule likes oil but dislikes water, the other side likes water but dislikes oil. Computer simulations on large oil/water/surfactant systems were performed on a network of 400 transputers using a parallel molecular dynamics algorithm. The simulations yield a complete micellar size distribution function. Furthermore, we observe (equilibrium) dynamical processes such as the entering of single surfactants into micelles, single surfactants leaving micelles, the fusion of two micelles, and the slow breakdown of a micelle.

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Kancharla, Samhitha, Aditya Choudhary, Ryan T. Davis, Dengpan Dong, Dmitry Bedrov, Marina Tsianou y Paschalis Alexandridis. "GenX in water: Interactions and self-assembly". Journal of Hazardous Materials 428 (abril de 2022): 128137. http://dx.doi.org/10.1016/j.jhazmat.2021.128137.

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Janlad, M., P. Boonnoy y J. Wong-ekkabut. "Self-Assembly of Aldehyde Lipids in Water". IOP Conference Series: Materials Science and Engineering 526 (8 de agosto de 2019): 012005. http://dx.doi.org/10.1088/1757-899x/526/1/012005.

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Rudolph, Alan S., Jeffrey M. Calvert, Mary E. Ayers y Joel M. Schnur. "Water-free self-assembly of phospholipid tubules". Journal of the American Chemical Society 111, n.º 22 (octubre de 1989): 8516–17. http://dx.doi.org/10.1021/ja00204a033.

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Lauceri, Rosaria, Massimo De Napoli, Angela Mammana, Sara Nardis, Andrea Romeo y Roberto Purrello. "Hierarchical self-assembly of water-soluble porphyrins". Synthetic Metals 147, n.º 1-3 (diciembre de 2004): 49–55. http://dx.doi.org/10.1016/j.synthmet.2004.05.031.

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Hato, Masakatsu, Hiroyuki Minamikawa, Kaoru Tamada, Teruhiko Baba y Yoshikazu Tanabe. "Self-assembly of synthetic glycolipid/water systems". Advances in Colloid and Interface Science 80, n.º 3 (abril de 1999): 233–70. http://dx.doi.org/10.1016/s0001-8686(98)00085-2.

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Odeh, Fadwa, Abeer Al-Bawab y Yuzhuo Li. "Self-Assembly Behavior of Benzotriazole in Water". Journal of Dispersion Science and Technology 31, n.º 2 (21 de enero de 2010): 162–68. http://dx.doi.org/10.1080/01932690903110186.

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Tesis sobre el tema "Self-assembly in water"

Puntambekar, Smita. "Molecular self assembly in fluorocarbon surfactant/water systems". Thesis, University of Central Lancashire, 2000. http://clok.uclan.ac.uk/20906/.

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The work presented is a continuation of the study of a homologous series of tetrabutylammonium perfluoroalkylcarboxylate surfactants in water. These systems showed phase behaviour uncharacteristic of ionic perfluorocarbon surfactant systems in that they exhibit a clouding phenomenon with increasing temperature. This behaviour was ascribed to the tight association of the large, hydrophobic counterions with the poiar head group region. In this study a series of perfluorocarbon surfactants have been synthesised in which the hycirophobicity of the counterion is varied. The counterion is W (CH2CH2CH2CH3)(CH3) 41 whilst the surfactant ion remains unchanged throughout the series as periluorodecanoate. The number of butyl chains. 'n' controls the hydrophobicity of the counterion and, in these experiments, n = 4, 2, 1 and 0. The phase diagrams and the detailed phase structures have been investigated using optical polarising microscopy, 2H NMR spectroscopy and small angle x-ray scattering. As n decreases, the phase diagrams change, recovering the "generic" phase behaviour more usual for a perfluorocarbon surfactant - water system. X-ray measurements show that in the n = 4 (tetrabutylammonium perfluorodecanoate) system, all the phases (both liquid crystalline and non-liquid crystalline) have uniform mean interfacial curvature. The phases observed are L 1 (vesicles), L. and L 2. With decreasing counterion hydrophobicity, the population of counterions associated with the interface decreases, introducing greater curvature into the system. The mean curvature of the phase structures also becomes nonuniform. For n = 0 (tetramethylammonium perfluorodecarioate) no classical mesophases are observed. Much of the liquid crystalline region is taken up with a random mesh intermediate phase, Mh 1 (0) and an extensive rhombohedral mesh intermediate phase, Mh1 (R3 m). Phase behaviour intermediate between the two extremes is observed at n = 1 (butyltrimethylammonium perfluorodecanoate). In this system, the clouding phenomenon is not observed but there is a two phase region of L 1 + L. at low concentration and high temperatures. The phase structures also possess uniform mean curvature. In keeping with the less hydrophobic systems, the L. phase is less temperature sensitive at high concentrations. This work has shown that the but'l groups of the counterion are, in part, responsible for the unusual phase behaviour observed in the TBA surfactants. The hydrophobic nature of the counterion has a major impact on the structures formed even at high dilution. This nature probably drives the counterion to the interface which affects the type of mesophase formed at higher concentrations and also determines its stability with respect to temperature and concentration.

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Zarra, Salvatore. "Water-soluble metal-organic architectures : self-assembly and host-guest behaviour". Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648397.

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Li, Tao. "Self-assembly of rod-like colloids at the air-water interface". Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/20993.

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Two-dimensional (2D) colloidal materials and their assembly are of scientific significance and industrial importance. The development of 2D colloidal structures is a key stepping stone towards three-dimensional (3D) structures in relation to controlled chemical composition, morphology, assembly and so on. Nowadays, uniform colloidal structures with complexity in both shape and interactions have become a popular topic in fundamental colloid science and applications. Being motivated by this, in this thesis, micro-scale colloidal rods and self-assembled dipeptides have been studied experimentally at the air-water interface. Monolayers containing these colloidal materials were created in a Langmuir trough. Surface pressure measurements, microscopic observations and many other techniques were combined for the investigation. The aim of this work is to understand the phase behaviours in complex monolayers, including the phase transitions during compression, the flipping dynamics of micro-rods, the contribution of dipole-dipole interactions between magnetic rods, and the interfacial self-assembly process of dipeptide molecules. Iron oxide micro-rods (β-FeOOH @silica) with different aspect ratios have been synthesized to create the monolayers at an air-water interface. Microscopic observations reveal a sequence of phase transitions by compressing the monolayers. It has been proved that the aspect ratio of the rods plays an important role in the phase transitions, —short rods flip into a perpendicular position relative to the interface to relieve the compressional stress, while longer rods form multilayers under compression. Magnetic rods (Fe3O4) were converted from the synthesized FeOOH rods. They can be aligned in an external field, which further induces the reorganization at the interface. To study these magnetic rods, differential dynamic microscopy (DDM) was carried out to measure the magnetic moment. Their interfacial properties were investigated in an external field applied perpendicular and parallel to the interface, respectively. A magnetic field-induced flipping process has been observed, which proves the theoretical prediction. Besides rod-like particles, naphthalene dipeptides have been successfully trapped at the interface of a low pH subphase, self-assembling into a hydrogel film. The mechanism of interfacial self-assembly has been studied. Both FTIR spectra and AFM images are used to investigate the fibrous structures of the film. The film has elastic properties and buckles under compression. Moreover, dipeptide hydrogel induced by metal ions has been used to create a wet foam system, which owns the advantages of long-term stability (more than two weeks), low cost, and easy preparation.

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Mayuram, Ravikumar Krishnakumar. "Region-specific role of water in collagen unwinding and assembly". Texas A&M University, 2008. http://hdl.handle.net/1969.1/85997.

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Conformational stability of the collagen triple helix affects its turnover and determines tissue homeostasis. Although it is known that the presence of imino acids (prolines or hydroxyprolines) confer stability to the molecule, little is known regarding the stability of the imino-poor region lacking imino acids, which plays a key role in collagen cleavage. In particular, there have been continuing debates about the role of water in collagen stability. We addressed these issues using molecular dynamics simulations on 30-residue long collagen triple helices, including a structure that has a biologically relevant 9-residue imino-poor region from type III collagen (Protein Data Bank ID: 1BKV). We characterized the conformational motion of the molecule that differs between imino-rich and imino-poor regions using a torsional map approach. At temperatures of 300 K and above, unwinding initiates at a common cleavage site, the glycine-isoleucine bond in the imino-poor region. This provides a linkage between previous observations that unwinding of the imino-poor region is a requirement for collagenase cleavage, and that isolated collagen molecules are unstable at body temperature. Unwinding of the imino-poor region is controlled by dynamic water bridges between backbone atoms with average lifetimes on the order of a few picoseconds, as the degree of unwinding strongly correlated with the loss of water bridges, and unwinding could be either prevented or enhanced, respectively by enforcing or forbidding water bridge formation. While individual water bridges were short-lived in the imino-poor region, the hydration shell surrounding the entire molecule was stable even at 330 K. The diameter of the hydrated collagen including the first hydration shell was about 14 Â, in good agreement with the experimentally measured inter-collagen distances. These results elucidate the general role of water in collagen turnover: water not only affects collagen cleavage by controlling its torsional motion, but it also forms a larger-scale lubrication layer mediating collagen self-assembly.

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BHAUMIK, JAYEETA. "RATIONAL SYNTHESIS OF IMIDAZOLYL PORPHYRINIC MOLECULES FOR SELF-ASSEMBLY AND WATER-SOLUBILITY". NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-03172006-014417/.

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The objective of this work is to develop synthetic methodology for self-assembling and water-soluble imidazole-containing porphyrinic molecules. The synthesis of the following types of compounds is described: (1) Imidazole-containing porphyrinic compounds; (2) Derivatization of the imidazolyl porphyrins to obtain water-soluble imidazolium porphyrins, and (3) Improved synthesis of tetrahydrodipyrrins - a precursor of hydroporphyrins. The self-assembly of imidazolyl metalloporphyrins was examined by UV-VIS spectroscopic analysis. Each imidazoyl metalloporphyrin was found to aggregate in non-polar solvents such as CH2Cl2. The test of water solubility was also based on absorption spectroscopy. A refined synthesis of a tetrahydrodipyrrin is described for medium-scale synthesis (>10 g of the product), which facilitates access to diverse hydroporphyrins. Water-soluble porphyrinic molecules are useful for life sciences applications, and the tetrahydrodipyrrin precursors are important for the synthesis of a variety of hydroporphyrins. Taken together, this work advances the methodology for preparing a variety of synthetic porphyrins.

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Batista, Marine. "Self-assembly of Fatty Acids of Hair at the water-air interface". Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277915.

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18-methyl eicosanoic acid (18-MEA), which is a branched fatty acid, is found at the outermost surface of mammalian hair with other straight-chain fatty acids such as palmitic acid and stearic acid. However, the precise role of 18-MEA is not yet completely understood. 18-MEA on Cadmium chloride subphase forms curvature at the water/air interface, leading to the formation of 3D-domains that can be easily transferred into solid support allowing to create complex and multi-functional structures. This project investigates if a non-toxic subphase would also lead to the formation of 3D-domains or if it is an intrinsic property of Cadmium chloride; and to investigate if the domain properties were tuneable. A combination of the Langmuir trough and the Atomic Force Microscopy is used. It is shown that a toxic subphase is not necessary and a more benign sodium subphase can be used to obtain 3D-domains. It is also shown that different chains length interact dissimilarly with the branched fatty acid. This results in the formation of very various structures. It is also shown that the subphase, the surface pressure of deposition and the composition of the fatty acid in the monolayer affect the properties of the domain, leading to different size of domain but also different morphology in the domain. Circular domains, elongated domains, continuous labyrinthine structures, dendritic centipede-like structures and no domains are obtained.
På den yttersta ytan av däggdjurshår återfinns den grenade fettsyran 18-methyleikosansyra tillsammans en mindre mängd av de raka fettsyrornapalmitinsyra och stearinsyra. Den exakta rollen av 18-MEA är dock ännu inte heltklarlagd. Ett monoskikt av 18-MEA på en subfas innehållande kadmiumklorid påtvingar en krökning av vatten–luftgränsytan. Det leder till bildandet av 3D-domäner som lätt kan överföras från vattenytan till fasta ytor vilket möjliggör att dekorera dessa ytor med komplexa och multifunktionella strukturer. Detta projekt undersöker om andra, miljövänliga motjoner i subfasen också skulle leda till bildandet av 3D-domäner eller om det är en inneboende egenskap hos kadmiumklorid. Det här ger även insikt om hur motjoner kan användas för att påverka och kontrollera domänbildningen. En kombination av Langmuirtråg och atomkraftsmikroskopi används för att karakterisera monoskikten. Det visas att en subfas innehållande kadmium inte är nödvändig och att en mer miljövänlig natriumsubfas kan användas för att bilda 3D-domäner. Det visas också att olika kedjors längd interagerar olika med den grenade fettsyran 18-MEA, vilket resulterar i bildandet av olika strukturer i deponerade monoskikt. Det visas också att yttrycket vid deponering och sammansättningen av fettsyror i mono skiktet påverkar egenskaperna hos monoskiktet, vilket leder till varierande storlek och struktur på de bildade domänerna, där cirkulära och långsträckta domäner, kontinuerliga labyrintstrukturer och dendritiska tusenfotingsliknande strukturer observeras.

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Zayed, Jameel Majed. "Self-assembly of synthetic and biological components in water using cucurbit[8]uril". Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/242016.

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This thesis discusses progress made towards assembling molecular building blocks in the presence of our molecular host of choice, cucurbit[8]uril (CB[8]). Our studies on the self-assembly of synthetic and biological components in water bridge overlapping conceptsand techniques drawn from the fields of synthetic organic chemistry, supramolecular self-assembly, and applied NMR techniques. Chapter 1 introduces the reader to chemical complexity, and how supramolecular chemistshave advanced in their capability of assembling more complex molecular architectures. The discussion focusses particularly on self-assembly carried out in the aqueousphase, and how, like in biology, molecular design of the building blocks become criticalin enabling non-covalent assembly to occur in this dynamic, and relatively competitiveenvironment. The cucurbit[n]uril family of molecular hosts are then introduced with anoverview of their modes of binding, and affinities towards typical guests. Finally, a practicalintroduction to NMR methods gaining prominence in supramolecular chemistry ispresented. In particular, the use of diffusion NMR, a key tool for probing the solutiondynamics of molecular assemblies, is highlighted. Chapter 2 details work carried out on the CB[8]-mediated self-assembly of supramolecularblock copolymers from polymeric, and small molecule building blocks. Here, endgroup-functionalised polymer guests were shown to assemble with small molecule ditopicguests in the presence of CB[8] to form block copolymers. Copolymers of various molecularweights were assembled, and the supramolecular complexes were studied usingsolution viscometry and diffusion NMR. This study represented the first use of diffusionNMR for probing the assembly of polymeric guests with CB[8].Chapter 3 describes the self-assembly of CB[8] with complementary ditopic guests. Highmolecular weight supramolecular polymers are known to form through the step-growthassembly of complementary ditopic building blocks. Here we sought to probe CB[8]?sability to drive supramolecular polymerisation. Solution viscometry, ESI-MS, and diffusionNMR were used to investigate the self-assembly process, which indicated that cyclicoligomers had formed. The relatively low solubility of CB[8] in water was thought to bea major limitation to polymer formation in this instance. Important observations relating to the effect of salts on the solution viscosities and stabilitiesof the complexes, are also discussed. Chapter 4 places emphasis on the synthetic methods employed towards preparing multivalentguests for CB[8] binding studies. Our synthetic guests were based on watersolubleoligomers of ethylene glycol. A bidirectional elongation route is presented foraccessing higher molecular weight, and monodisperse ethylene glycol oligomers (n = 12)in suitable purity. Chapter 5 describes the assembly of protein-polymer conjugates, and the versatility ofdiffusion NMR as a means to probe the assembly process. Here, end group-functionalisedpoly(ethylene glycol) guests were appended to bovine serum albumin (BSA) through amixed chemical ligation-self assembly protocol. The NMR studies conducted are emphasisedhere, which served to complement other characterisation methods used thatare reported elsewhere. Chapter 6 discusses ongoing work on lipid-based guests, and the resulting liposome assembliesformed. Head group-functionalised phospholipid guests, and cholesterol-basedguests were synthesised. Phospholipid guests were obtained through an enzymatic route,a novelty in our group. Dye-encapsulated liposomes were then assembled, purified, andcharacterised by fluorescence microscopy. Finally, we sought to optimise lipid formulationsto enhance liposome stability, towards conducting molecular recognition studies inthe presence of CB[8].Chapter 7 then closes the thesis with concluding remarks that summarise the describedresearch, while highlighting points of note.

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Biedermann, Frank. "Cucurbit[n]uril mediated self-assembly in water : from binding forces to applications". Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607771.

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Chiu, Ming. "Patterned and Structured Polymer Coatings for Atmospheric Water Capture". Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/26945.

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Polymer coatings are a versatile, efficient, and up-scalable platform for fabricating functionalised surfaces in many different applications. Functional surfaces, in particular, can be achieved by inducing a surface structure or a pattern within a polymer film, and in this Thesis, the focus has been on investigating functional structures that self-assemble spontaneously on a surface. Firstly, a polymer thin film coated on a non-wettable substrate is metastable and, if allowed to relax, may dewet into isolated droplets over the substrate. A novel phenomenon occurring in bilayers of spin-coated polymer films (of polar poly (4-vinylpyridine) (P4VP) on top of polystyrene (PS)) was investigated whereby dewetted P4VP droplets spontaneously align on the PS substrate, and the alignment extends over a large scale (millimetres). The aligned pattern results from a series of aligned defects on the P4VP film, which are formed during spin-coating. Secondly, a homogeneous ternary polymer mixture with a good solvent and a poor solvent is prone to undergoing phase separation (or phase inversion). As the good solvent evaporates, it triggers the mixture to separate into a polymer-rich phase and a polymer-lean phase mainly consisting of the solvent and non-solvent. When the latter evaporate, they leave a high density of air voids, and the final material is a highly porous polymer layer. Here, a structured porous polymer layer based on poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) was used as a platform for passive cooling and water collection. The phase inversion process was investigated as a function of a number of system parameters such as polymer grade, mixture composition, layer thickness, and humidity of the environment during phase inversion. The surfaces were then integrated within a prototype for passive atmospheric water harvesting, demonstrating promising avenues for future research.

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Wallace, Ashley J. "pH-triggered Self-Assembly of a PEGylated Peptide Amphiphilic Contrast Agent". The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500485484867638.

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Más fuentes

Libros sobre el tema "Self-assembly in water"

Malfatti, Luca, Paolo Falcaro y Plinio Innocenzi. Water Droplets to Nanotechnology: A Journey Through Self-Assembly. Royal Society of Chemistry, The, 2023.

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Capítulos de libros sobre el tema "Self-assembly in water"

Kim, Byung Il. "Self-Assembly, Entropy Forces, and Kelvin Equation". En Self-Assembled Water Chains, 17–37. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-19087-2_2.

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Miyashita, Shuhei, Max Lungarella y Rolf Pfeifer. "Tribolon: Water-Based Self-Assembly Robots". En Artificial Life Models in Hardware, 161–84. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-530-7_8.

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Russell, J., B. Wang, N. Patra y P. Král. "Water Nanodroplets: Molecular Drag and Self-assembly". En Lecture Notes in Nanoscale Science and Technology, 301–27. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9472-0_13.

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Kaya, Abdulaziz, Daniel A. Drazenovich, Wolfgang G. Glasser, Thomas Heinze y Alan R. Esker. "Hydroxypropyl Xylan Self-Assembly at Air/Water and Water/Cellulose Interfaces". En ACS Symposium Series, 173–91. Washington DC: American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1019.ch008.

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Terashima, Takaya. "Programmed Self-Assembly of Amphiphilic Random Copolymers in Water via Controlled Radical Polymerization". En ACS Symposium Series, 143–55. Washington, DC: American Chemical Society, 2018. http://dx.doi.org/10.1021/bk-2018-1285.ch008.

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Fujimoto, Taisuke, Emi Yoshimoto y Masahiko Annaka. "Study on Self-Assembly of Telechelic Hydrophobically Modified Poly(N-isopropylacrylamide) in Water". En Gels: Structures, Properties, and Functions, 77–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00865-8_11.

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Girard, Etienne, Jean-Daniel Marty y Mathias Destarac. "Fluoropolymers in Supercritical Carbon Dioxide: Phase Behavior, Self-Assembly, and Stabilization of Water/CO2Emulsions". En Handbook of Fluoropolymer Science and Technology, 315–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118850220.ch13.

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Higashiguchi, Kenji y Kenji Matsuda. "Photoinduced Morphological Transformation and Photodriven Movement of Objects Using Self-assembly of Amphiphilic Diarylethene in Water". En Photosynergetic Responses in Molecules and Molecular Aggregates, 327–48. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5451-3_19.

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Fuchise, Keita. "Control of Thermoresponsive Properties of Urea End-Functionalized Poly(N-isopropylacrylamide) Based on the Hydrogen Bond Assisted Self-Assembly in Water". En Springer Theses, 27–43. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-55046-4_2.

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Atkins, Peter, Julio de Paula y James Keeler. "Self-assembly". En Atkins’ Physical Chemistry. Oxford University Press, 2022. http://dx.doi.org/10.1093/hesc/9780198847816.003.0079.

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This chapter talks about aggregates of small and large molecules form the basis of many established and emerging technologies, including their structures and properties. It cites colloids and micelles, which form spontaneously by self-assembly of molecules or macromolecules and are held together by molecular interactions. It also defines self-assembly as the spontaneous formation of complex structures of molecules or macromolecules, which are held together by molecular interactions, such as Coulombic, dispersion, hydrogen bonding, and hydrophobic interactions. The chapter cites examples of self-assembly, which include the formation of liquid crystals and of protein quaternary structures from two or more polypeptide chains. It analyses the dissolution process in more detail by illustrating a hypothetical initial state in which the alcohol is present in water as individual molecules.

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Actas de conferencias sobre el tema "Self-assembly in water"

Park, K. S., C. Varel, J. H. Hoo, R. Baskaran y K. F. Böhringer. "3D INTEGRATION USING SELF-ASSEMBLY AT AIR-WATER INTERFACE". En 2012 Solid-State, Actuators, and Microsystems Workshop. San Diego: Transducer Research Foundation, 2012. http://dx.doi.org/10.31438/trf.hh2012.112.

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Hamano, Ryo y Hiroaki Suzuki. "Templated Self-Assembly of Microcomponents Using Water-Oil Interface". En 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). IEEE, 2019. http://dx.doi.org/10.1109/transducers.2019.8808205.

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Sato, Kaiji, Seiichi Hata y Akira Shimokohbe. "Self-alignment for microparts assembly using water surface tension". En Asia Pacific Symposium on Microelectronics and MEMS, editado por Kevin H. Chau y Sima Dimitrijev. SPIE, 1999. http://dx.doi.org/10.1117/12.364500.

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Miyashita, S., F. Casanova, M. Lungarella y R. Pfeifer. "Tribolon: Water based self-assembly robot with freezing connector (video)". En 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems. IEEE, 2008. http://dx.doi.org/10.1109/iros.2008.4651233.

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Park, K. S., R. Baskaran y K. F. Bohringer. "Orientation-specific self-assembly at air-water interface using magnetic field". En TRANSDUCERS 2011 - 2011 16th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2011. http://dx.doi.org/10.1109/transducers.2011.5969545.

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Park, Kwang Soon, Cagdac Varel, Rajashree Baskaran y Karl F. Bohringer. "Fabrication of 3D structures using self-assembly at an air-water interface". En 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII). IEEE, 2013. http://dx.doi.org/10.1109/transducers.2013.6627168.

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Mortuza, S. M. y Soumik Banerjee. "Controlled Self-Assembly of Functionalized Carbon Nanotubes on Silicon Substrates". En ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66579.

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Self-assembly of carbon nanotubes (CNTs) on silicon substrates has myriad applications including nanotube based electrochemical energy conversion and storage devices, such as batteries and super-capacitors. Patterned assembly of CNTs is required in order to control the effective electrical conductivity and mechanical properties of these devices and achieve substantial improvement in their performance. Solution-based self-assembly of CNTs provides a cost-effective means to synthesize uniform vertically or horizontally aligned nanostructures on top of substrates. However, self-assembly of CNTs is a complex dynamical process that involves intermolecular interaction between the CNTs and that between the nanotubes and the substrate as well as solvent molecules. The transport properties of CNTs and solvents also play an important role. The scientific literature lacks detailed study of understanding the mechanism of self-assembly of CNTs on substrates during synthesis process. Often times, nanotubes are functionalized in an effort to make them more soluble and induce partial charges to control the self-assembly. Some of the key factors that govern the transportation and self-assembly of functionalized CNTs are surface charge density on substrate and electrostatic interaction of the functionalized CNTs with the substrate. In an effort to mimic the conditions during the synthesis of carbon nanomaterials on silicon substrate, we have employed molecular dynamics simulations to simulate both pure and functionalized CNTs sandwiched between silicon substrates in presence of commonly used solvent, water. Our simulations indicate that both pure and functionalized CNTs are not significantly soluble in water and form agglomerates. Our results also illustrate that neither pure nor functionalized CNTs tend to deposit on silicon substrates in water. Results presented in this study provide fundamental insight that can help to understand the agglomeration and orientation of CNTs in water.

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Tayeb, Raihan, Yijin Mao y Yuwen Zhang. "Numerical Investigation of Evaporation Induced Self-Assembly of Sub-Micron Particles Suspended in Water". En ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6373.

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Self-assembly of sub-micron particles suspended in a water film is investigated numerically. The liquid medium is allowed to evaporate leaving only the sub-micron particles. A coupled CFD-DEM approach is used for the simulation of fluid-particle interaction. Momentum exchange and heat transfer between particles and fluid and among particles are considered. A history dependent contact model is used to compute the contact force among sub-micron particles. Simulation is done using the open source software package CFDEM which basically comprises of two other open source packages OpenFOAM and LIGGGHTS. OpenFOAM is a widely used solver for CFD related problems. LIGGGHTS, a modification of LAMMPS, is used for DEM simulation of granular materials. The final packing structure of the sub-micron particles is discussed in terms of distribution of coordination number and radial distribution function (RDF). The final packing structure shows that particles form clusters and exhibit a definite pattern as water evaporates away.

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Drzewiecki, Kathryn, Ian Gaudet, Douglas Pike, Jonathan Branch, Vikas Nanda y David Shreiber. "Temperature Dependent Reversible Self Assembly of Methacrylated Collagen Gels". En ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14705.

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Hydrogel-based tissue engineering scaffolds can allow tissues to repair and regenerate by providing a 3D environment similar to soft tissue. Type I collagen has the ability to assemble into a fibrillar gel at physiological temperature and pH, while promoting cell adhesion and growth. Our lab has modified type I collagen by covalently adding methacrylate groups to lysine residues to create collagen methacrylamide (CMA). This biomaterial, like collagen, maintains the ability to self-assemble, and can then be photocrosslinked with long-wave UV light and a water-soluble photoinitiator, which allows extensive spatiotemporal control of mechanical and biochemical properties [1]. In characterizing CMA and developing it for other applications, we discovered an interesting property. Unlike type I collagen hydrogels, which maintain a stable fibrillar network during cooling and freezing, CMA will spontaneously disassemble at temperatures less than 10°C. In this paper, we discuss the temperature-dependent rheological properties of CMA as well as the nature of its molecular and supramolecular structure in comparison to collagen.

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Park, Kwang Soon, Xugang Xiong, Rajashree Baskaran y Karl F Bohringer. "Fluidic self-assembly of millimeter scale thin parts on preprogrammed substrate at air-water interface". En 23rd IEEE International Conference on Micro Electro Mechanical Systems (MEMS 2010). IEEE, 2010. http://dx.doi.org/10.1109/memsys.2010.5442454.

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