Download or read book Water Structure at the Water Polymer Interface written by H. Jellinek and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This symposium was held at the l6lst ACS National Meeting, Los Angeles, March/April 1971. It represents a contribution to the discussion of problems connected with the state of water near macromolecules. Some papers are only peripheral to the problem of water structure but may become quite pertinent in specific cases. Questions concerned with water structure, rate of hydration, and similar problems are of importance for biological processes and are still not yet well understood. It is hoped that the papers presented here will be of some help in the clarification of problems in this area. H. H. G. Jellinek Department of Chemistry Clarkson College of Technology Potsdam, New York September, 1971 v CONTRIBUTORS S. Ablett, Unilever Research Laboratory, Colworth House, Sharnbrook, Bedford, England M. Anbar, Stanford Research Institute, Menlo Park, California F. W. Cope, Biochemistry Division, Aerospace Medical Research Laboratory, U. S. Naval Air Development Center, Warminster, Pennsylvania B. Crist, Camille Dreyfus Laboratory, Research Triangle Park, North Carolina F. Franks, Unilever Research Laboratory, Colworth House, Sharnbrook, Bedford, England H. R, Gloria, NASA-Ames Research Center, Moffett Field, California G. W. Gross, New Mexico Institute of Mining and Technology, Socorro, New Mexico H. R. Hansen, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio R. S. Kaiser, Research Laboratories, Eastman Kodak Company, Rochester, New York N. Laiken, Department of Chemistry, The University of Oregon, Eugene, Oregon C. E. Lamaze, Camille Dreyfus Laboratory, Research Triangle Park, North Carolina G. N.
Download or read book Water Structure at the Water polymer Interface written by and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Structure at the Water Polymer Interface written by H. H. G. Jellinek and published by . This book was released on 1972-03-01 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Structure at the Water polymer Interface Proceedings of a Symposium Held at the 161st National Meeting of the American Chemical Society April 1971 written by H.H.G. Jellinek and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural and Dynamical Properties of Water and Polymers at Surfaces and Interfaces written by Selemon Bekele and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: All-atom molecular dynamics simulations have been carried out to study the wetting of model atactic polystyrene thin films by water droplets as a function of surface polarity, the structure and dynamics at the surface of polymer films, the properties of interfacial water molecules in contact with atactic polystyrene surfaces of varying polarity, and the spreading dynamics of water droplets of varying sizes on a completely wetting surface. The simulated contact angle of a water droplet on atactic polystyrene thin films is found to decrease monotonically with increasing degree of surface oxidation which is used as a measure of surface polarity. The number of hydrogen bonds between water molecules and the polystyrene at the interface is found to monotonically increase with polarity. The contribution of the non-dispersion interactions to the interfacial energy at the polystyrene/water interface has been determined as a function of surface polarity. The roughness of the polystyrene surface and the orientational ordering of the surface phenyl rings are found to be independent of surface polarity when the polystyrene is exposed to vacuum. Surface roughness appears to increase and orientational ordering of surface rings appears to decrease slightly with polarity when the polystyrene is in contact with water. Density profiles of polymer films as a function of distance relative to an instantaneous surface exhibit a structure indicative of a layering at the polymer/vapor interface similar to the typical layered structure observed at the polymer/substrate interface. Interfacial molecules at the polymer/vapor interface have a higher mobility compared to that in the bulk while the mobility of the molecules is lower at the polymer/substrate interface. Time correlation of the instantaneous polymer/vapor interface shows that surface fluctuations are strongly temperature dependent and are directly related to the mobility of polymer chains near the interface. Interfacial water molecules on a bare atactic polystyrene surface and those which do not make hydrogen bonds with the oxidized surfaces are found to have a faster dynamics and appear to have a universal water-water hydrogen bond relaxation time of about 5 ps. Diffusion coefficients and the relaxation times of the water molecules involved in hydrogen bonding with the surface show strong dependence on surface polarity with a hydrophobic to hydrophilic transition regime with contact angle in the range 40-50°. The spreading of water droplets on completely wetting surface is characterized by a bulk part of normal density sliding over a monolayer of high density water. The monolayer has a molecular dimension and moves ahead of the bulk part of the droplet. The monolayer motion exhibits two spreading regimes, each following a power law in time. The bulk part of the droplet initially spreads over the monolayer with increasing radius until a characteristic time t* where the monolayer changes from one power law behavior to another. For times after t* ~ 0.1- 0.5 ns, it shrinks while maintaining what appears to be a constant contact angle until it disappears altogether and only a monolayer of water remains on the substrate.
Download or read book Understanding the Structure of Water Ice and Aqueous Solutions Next to Solid Surfaces written by Emmanuel Anim-Danso and published by . This book was released on 2015 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Finally, we have also performed experiments at polymer/water interface. The polymer/water interface is commonly encountered and a molecular understanding of surface restructuring in water will be useful to biomedical science. We studied how poly(n-butyl a-hydroxymethyl acrylate) (PHNB), an amphiphilic polymer, restructures in the vicinity of water using SFG and contact angle measurements. We have observed that at room temperature, the surface resists putting the more hydrophilic groups at the interface with water. Even though such a conformation is thermodynamically favorable, the polymer surface appears to be frozen due to the high polymer Tg. However, when the polymer is heated in water above its Tg (80oC), the surface restructures due to the increased segmental motions in the polymer. Our study into the molecular interactions of water and ice with solid surfaces provides insights into the increased adhesion of ice to surfaces and could lead to the design of materials that could reduce ice adhesion strength on surfaces]
Download or read book Polymer Interfaces and Emulsions written by Kunio Esumi and published by CRC Press. This book was released on 2020-08-13 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Presents the latest knowledge on a wide range of topics in polymer science, including the dynamics, preparation, application, and physiochemical properties of polymer solutions and colloids; the adsorption characteristics at polymer surfaces; and the adhesion properties (including acid-base) of polymer surfaces."
Download or read book Water in Biological and Chemical Processes written by Biman Bagchi and published by Cambridge University Press. This book was released on 2013-11-14 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unified overview of the dynamical properties of water and its unique and diverse role in biological and chemical processes.
Download or read book Fundamentals of Sum Frequency Spectroscopy written by Y. R. Shen and published by Cambridge University Press. This book was released on 2016-02-18 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book on the topic, and written by the founder of the technique, this comprehensive resource provides a detailed overview of sum-frequency spectroscopy, its fundamental principles, and the wide range of applications for surfaces, interfaces, and bulk. Beginning with an overview of the historical context, and introductions to the basic theory of nonlinear optics and surface sum-frequency generation, topics covered include discussion of different experimental arrangements adopted by researchers, notes on proper data analysis, an up-to-date survey commenting on the wide range of successful applications of the tool, and a valuable insight into current unsolved problems and potential areas to be explored in the future. With the addition of chapter appendices that offer the opportunity for more in-depth theoretical discussion, this is an essential resource that integrates all aspects of the subject and is ideal for anyone using, or interested in using, sum-frequency spectroscopy.
Download or read book Water at Interfaces written by Jordi Fraxedas and published by CRC Press. This book was released on 2014-04-15 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water, with its simple molecular structure, reveals a complex nature upon interaction with other molecules and surfaces. Water at Interfaces: A Molecular Approach provides a broad, multidisciplinary introduction to water at interfaces, focusing on its molecular characteristics. The book considers interfaces at different length scales from single wa
Download or read book Infrared visible Sum Frequency Genergation Studies of Water at the Polymer sapphire Interface written by Jing Zhou and published by . This book was released on 2013 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water between two solid surfaces plays an important role in interfacial adhesion, catalysis, corrosion, microelectronic industry and biomaterials. (1, 2) However, research on molecular-level structure of confined water between two solid surfaces and the disruption of interactions between these two surfaces caused by water are lacking. Infrared-visible sum frequency generation spectroscopy (SFG) is used to directly probe confined water between polyurethane (PU) and the sapphire substrate after exposing the polyurethane films to liquid water and water vapor. In liquid water condition, the observation of SFG peaks associated with H2O bands (3000-3400 cm−1) and D2O bands (2300-2600 cm−1) indicate water molecules ingress to the buried interface and exist in the form of hydrogen-bonded water network. The water layer disrupts interactions between polyurethane and hydroxyl groups on the substrate. When PU films were exposed to water vapor, the SFG signal corresponding to PU hydrocarbon groups significantly increase, while the SFG signal of sapphire hydroxyl groups decrease, which indicates water molecules reach the interface. However, no hydrogen-bonded water network was observed, instead, H2O peak at 3555 cm−1 and D2O peaks (2600-2700 cm−1) show up which can be assigned to low-coordination water. An alternate assignment could be the hydroxyl groups hydrogen bonded with carboxyl groups of PU. Water molecules cannot form a uniform monolayer at the interface and as a consequence cannot completely disrupt the PU-sapphire bonds. These results provide two distinct states of water at the polymer-solid interface, which could influence the interfacial bonding state differently and have important implications in understanding interfacial adhesion, coatings and corrosion.
Download or read book Water Structure at Tunable Surfaces written by Aliyah Rebecca Barrett and published by . This book was released on 2016 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between water and a surface is highly localized and responsive to material properties, driving a diverse set of processes such as lipid membrane assembly, protein folding, proton transfer, and ion adsorption at minerals. However, naturally-occurring surfaces are highly heterogeneous and complex. Model surfaces were developed at which properties such as texture and polarity were independently controlled, and sum frequency generation spectroscopy was used to probe the water structure at these interfaces. A series of mixed hydrophobic monolayers were applied to transparent windows to create textured surfaces. The intensity of non-hydrogen bonded water molecules at the monolayers was found to correlate not with the order of the monomers within the monolayer, but with the monolayer surface area. A strategy to functionalize silica surfaces with densely-packed, well-ordered OH- and COOH-terminated siloxane monolayers was then explored. Monomers with heat labile groups were bound to silica, and the protecting groups were removed by heat after monolayer deposition. While not initially successful, with a change of monomer binding group this technique may be used generally to create high quality monolayers with termini not otherwise compatible with this type of monolayer. In a collaborative project, water structure at polymer filtration membranes was observed in the presence of a biological buffer. It was found that films functionalized with poly (ethylene glycol), used commonly to prevent protein fouling, excluded phosphate ions from the immediate interface. The resulting electrical double layer aligned water molecules at the interface. These findings demonstrate the importance of specific ion effects in surface fouling.
Download or read book Polymer Biomaterials in Solution as Interfaces and as Solids written by Stuart Cooper and published by CRC Press. This book was released on 2014-07-30 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The articles collected in this publication have previously been published in eight special issues of the Journal of Biomaterials Science, Polymer Edition, in honour of Dr. Allan S. Hoffman, who is known as a pioneer, a leader and a mentor in the field of biomaterials. The papers from renowned scientists from all parts of the world, representing the
Download or read book Polymer Interface and Adhesion written by Wu and published by Routledge. This book was released on 2017-11-22 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Poly mer Interface and Adhesion provides the critical basis for further advancement in thisfield. Combining the principles of interfacial science, rheology, stress analysis, and fracturemechanics, the book teaches a new approach to the analysis of long standing problemssuch as: how is the interface formed; what are its physical and mechanical properties;and how does the interface modify the stress field and fracture strength of the material.The book offers many outstanding features, including extensive listings of pertinent references,exhaustive tabulations of the interfacial properties of polymers, critical reviews ofthe many conflicting theories, and complete discussions of coupling agents, adhesion promotion,and surface modifications. Emphasis is placed on physical concepts and mechanisms,using clear, understandable mathematics.Polymer Interface and Adhesion promotes a more thorough understanding of the physical,mechanical, and adhesive properties of multiphase, polymer systems. Polymer scientistsand engineers, surface chemists, materials scientists, rheologists, as well as chemical andmechanical engineers interested in the research, development or industrial applications ofpolymers, plastics, fibers, coatings, adhesives, and composites need this important newsource book.
Download or read book Proceedings of the First National Symposium on Sickle Cell Disease Washington D C June 27 29 1974 written by and published by . This book was released on 1975 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrophilic Polymer Coatings for Medical Devices written by Richard J. LaPorte and published by Routledge. This book was released on 2017-11-01 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new text provides a practical guide to hydrophilic polymer coatings technology for applications in a wide range of medical materials and devices. It concisely provides both the scientific basics of this class of polymers and the up-to-date information needed for product development and evaluation, processing, manufacturing, and regulatory compliance. More than fifty schematics illustrate materials, processes, and equipment. The entire presentation is oriented to the practical needs of personnel involved in product development and evaluation, process engineering, and manufacturing management.
Download or read book Cancer Chemotherapy Reports written by and published by . This book was released on 1974 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
