Download or read book Fundamental Studies of PH sensitivity in Polyelectrolyte Multilayers written by Jeeyoung Choi and published by . This book was released on 2004 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Specifically, by using a transmission FT-IR analysis on dried films, the threshold of the charge density where the resulting layer thickness exhibits a sudden incremental change due to a different chain conformation and amount of the adsorbed molecules in the multilayers was identified. Also, the pKa of PAA was revealed to shift by choice of co-assembled polycations within the multilayers, which was expanded to investigation of applications in in-situ synthesis of silver nanoparticles and pH-induced morphological transformation in weak polyelectrolyte multilayers.

Download or read book Fundamental and Applied Aspects of Chemically Modified Surfaces written by J P Blitz and published by Elsevier. This book was released on 1999-01-01 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of chemically modified particle surfaces has seen many significant developments. This text covers analytical and synthetic techniques for the development and understanding of these surfaces. Encompassing subjects including self-assembled monolayers, scanning probe microscopies, combinatorial synthetic techniques, plasma polymerizations and molecular modelling of modified surfaces, the book provides a snap-shot of concepts and tools.

Download or read book Fundamentals of Nanoparticles written by Abdel Salam Hamdy Makhlouf and published by William Andrew. This book was released on 2018-08-09 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Nanoparticles: Classifications, Synthesis Methods, Properties and Characterization explores the nanoparticles and architecture of nanostructured materials being used today in a comprehensive, detailed manner. This book focuses primarily on the characterization, properties and synthesis of nanoscale materials, and is divided into three major parts. This is a valuable reference for materials scientists, and chemical and mechanical engineers working in R&D and academia, who want to learn more about how nanoparticles and nanomaterials are characterized and engineered. Part one covers nanoparticles formation, self-assembly in the architecture nanostructures, types and classifications of nanoparticles, and signature physical and chemical properties, toxicity and regulations. Part two presents different ways to form nanometer particles, including bottom-up and top-down approaches, the classical and non-classical theories of nanoparticles formation and self-assembly, surface functionalization and other surface treatments to allow practical use. Part three covers characterization of nanoparticles and nanostructured materials, including the determination of size and shape, in addition to atomic and electronic structures and other important properties. - Includes new physical and chemical techniques for the synthesis of nanoparticles and architecture nanostructures - Features an in-depth treatment of nanoparticles and nanostructures, including their characterization and chemical and physical properties - Explores the unusual properties of materials that are developed by modifying their shape and composition and by manipulating the arrangement of atoms and molecules - Explains important techniques for the synthesis, fabrication and the characterization of complex nano-architectures

Download or read book PH gated Porosity and Reversible Swelling Transitions in Polyelectrolyte Multilayers written by Jeri' Ann Hiller and published by . This book was released on 2003 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores the design of novel pH-responsive polyelectrolyte multilayer (PEM) films. The discoveries of discontinuous pH-induced swelling transitions and concomitant conformational memory effects as well as pH-gated nano- and microporosity in PEMs, are described. The PEMs in this thesis are created by an aqueous processing technique, which enables the straightforward manipulation of processing variables to create molecular-level designed polymeric coatings. The first part of this thesis examines discontinuous pH-induced swelling transitions and reversible memory effects in certain PEMs of poly(allylamine hydrochloride) and (poly(styrene sulfonic acid) (PAH/SPS). It is demonstrated that the systematic design of molecular organization, hydrophobic character, and a variable electrostatic nature, enables these phenomena in PAH/SPS films. Consequently, co-existing conformational states result, which allow the regulation of the affinity of molecular species to the PEM as well as their sustained release from the PEM. The second part of this thesis describes phase-separation phenomena in PEMs comprised of PAH and poly(acrylic acid) (PAA). It is shown that specifically designed PAH/PAA films exhibit pH-gated nano- and microporosity. Further, the length-scale of pH-gated porosity can be systematically tuned by simple variations in the film's processing conditions. It is shown that nanoporous films can be designed to possess indices of refraction in the range of 1.5 - 1.15 and can be employed as high-performance anti-reflection coatings. Several designs of optical coatings are demonstrated, as is the ability to pattern these coatings by a simple aqueous technique. The ability to reversibly uptake and release molecular species from the pH-gated porous structures is also discussed. Overall, the observations in this thesis underscore the fact that unique pH-responsive behavior can be systematically designed into PEM films by virtue of processing parameters such as solution pH and the choice of polyelectrolytes.

Download or read book Multilayer Thin Films written by Gero Decher and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 543 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials scientists are often faced with the problem of modifying surfaces of objects, yet keeping their shape and properties. This book provides a detailed survey on the new technology of adsorption from solution for the fabrication of molecularly ordered multicomposite films in order to replace and expand on the well known Langmuir-Blodgett technology and to open the field of molecular self-assembly to materials and biosciences. The book is aimed at scientists who want to integrate several different functional entities in a single device. To this audience it presents the technique of layer-by-layer assembly as today's most powerful key technology, which is low cost, solution based and very robust. It is already beginning to make the transition from academic research into industrial mass production.

Download or read book On the Adhesion Between Substrates Covered with Polyelectrolyte Multilayers written by Rikard Lingström and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the formation of Polyelectrolyte Multilayers (PEM) on cellulose fibres as a new way of influencing the fibre surface and the adhesion between wood fibres. The aim of the study was to enhance the fundamental understanding of the adsorption mechanisms behind the formation of Polyelectrolyte Multilayers on cellulose fibres; to study how the properties of the layers can be influenced and to show how the properties of the layers influence the adhesion between the fibres and the strength of paper sheets made from the PEM treated fibres. Different polyelectrolyte systems are known to form PEMs with different properties, and in this work two different polymer systems were extensively studied: poly(dimethyldiallylammonium chloride) (PDADMAC) / poly(styrene sulphonate) (PSS), which are both strong polylectrolytes (i.e. are highly charged over a wide range of pH) and poly allylaminehydrochloride (PAH) /poly acrylic acid (PAA), which are both weak polyelectorlytes (i.e. sensitive to pH changes). PEMs were also formed from PAH/ poly(3,4-ethylenedioxythiophene):PSS (PEDOT:PSS), in order to form electrically conducting PEMs on fibres and PEM-like structures were formed from polyethylene oxide (PEO) and polyacrylic acid (PAA). (...).

Download or read book Self assembly Stability Studies and Computer Modeling of Ultra Thin Protein polyelectrolyte Multilayer Films written by Venkateswarlu Panchagnula and published by . This book was released on 2005 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanochemistry written by Geoffrey A Ozin and published by Royal Society of Chemistry. This book was released on 2023-01-17 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt: International interest in nanoscience research has flourished in recent years, as it becomes an integral part in the development of future technologies. The diverse, interdisciplinary nature of nanoscience means effective communication between disciplines is pivotal in the successful utilization of the science. Nanochemistry: A Chemical Approach to Nanomaterials is the first textbook for teaching nanochemistry and adopts an interdisciplinary and comprehensive approach to the subject. It presents a basic chemical strategy for making nanomaterials and describes some of the principles of materials self-assembly over 'all' scales. It demonstrates how nanometre and micrometre scale building blocks (with a wide range of shapes, compositions and surface functionalities) can be coerced through chemistry to organize spontaneously into unprecedented structures, which can serve as tailored functional materials. Suggestions of new ways to tackle research problems and speculations on how to think about assembling the future of nanotechnology are given. Primarily designed for teaching, this book will appeal to graduate and advanced undergraduate students. It is well illustrated with graphical representations of the structure and form of nanomaterials and contains problem sets as well as other pedagogical features such as further reading, case studies and a comprehensive bibliography.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Glycopolymers Polyelectrolyte Multilayers for Biomedical Applications written by and published by Scholar Press. This book was released on 2018-01-16 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical background of this work is concerning with the drug loaded polyelectrolyte multilayers (PEM) modified by the host-guest interaction of biocompatible hyperbranched core-shell glycopolymers. The glycopolymer in this work is the hyperbranched polyethyleneimine that was modified with maltose moieties using reductive amination. Thus, the use of glycohyperbranched polymers for drug delivery would allow the avoid naturally occurring drug resistance due to decreased transporter activity. Concerning preparative method, PEM was fabricated using layer-by-layer (LbL) processes involve the sequential deposition of two polyions that physically bond together. Control was taken on the stoichiometric ratio related to cationic and anionic repeating units, which was chosen close to zero for the final applied PEM. Concerning analytical methods, a couple of physical-chemical methods were applied to characterize colloid stability, adhesiveness, drug loading and release of fabricated PEM. In conclusion, a highly sable and sustainable PEM coats on a surface of an activated solid substrate has been fabricated with an efficient ability to recycle the charged molecule for more than 24 times.

Download or read book Surface and Interfacial Forces From Fundamentals to Applications written by Günter Auernhammer and published by Springer. This book was released on 2008-08-29 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: © Springer-Verlag 2008 rd 43 Biennial Meeting of the German Colloid Society rd This volume containsselected paperspresented at the 43 Biennial Meeting of the German Colloid Society held at the Schloß Waldthausen near Mainz, October 8–10, 2007. The meeting’s emphasis was given to “Surface and Interfacial Forces – From Fundamentals to Applications” but also provided a general overview on current aspects of colloid and polymer science in fundamental research and applications. The contributions in this volume are representative of the richness of research topics in colloid and polymer science. They cover a broad eld including the application of scanning probe techniques to colloid and interface science, surface induced ordering, novel developments in amphiphilic systems as well as the synthesis and applications of nano-colloids. The meeting brought together people from different elds of colloid, polymer, and materials science and provided the platform for dialogue between scientists from universities, industry, and research institutions.

Download or read book Multilayer Thin Films written by Gero Decher and published by John Wiley & Sons. This book was released on 2012-06-11 with total page 1157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second, comprehensive edition of the pioneering book in this fi eld has been completely revised and extended, now stretching to two volumes. The result is a comprehensive summary of layer-by-layer assembled, truly hybrid nanomaterials and thin fi lms, covering organic, inorganic, colloidal, macromolecular, and biological components, as well as the assembly of nanoscale fi lms derived from them on surfaces. These two volumes are essential for anyone working in the field, as well as scientists and researchers active in materials development, who needs the key knowledge provided herein for linking the field of molecular self-assembly with the bio- and materials sciences.

Download or read book Handbook of Research on Nanoemulsion Applications in Agriculture Food Health and Biomedical Sciences written by Ramalingam, Karthikeyan and published by IGI Global. This book was released on 2021-12-03 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoemulsions are produced by mixing an oil phase with an aqueous phase under shear pressure. This procedure yields uniform populations of oil droplets ranging in diameter from 200 to 8 nm that are kinetically stable colloidal substances with enhanced properties compared to the conventional emulsion substances. Nanoemulsions have broad potential applications in agriculture, food, health, and biomedical sciences. The Handbook of Research on Nanoemulsion Applications in Agriculture, Food, Health, and Biomedical Sciences focuses on the aspects of nanoemulsion-like synthesis, characterization, and more and examines recent trends in their applications within a variety of relevant fields. Nanoemulsions have broad application in many different fields; without emulsification, process product development would not be possible. Covering topics such as cancer treatment, healthcare applications, and food manufacturing, this book is essential for scientists, doctors, researchers, post-graduate students, medical students, government officials, hospital directors, professors, and academicians.

Download or read book Handbook of Polyelectrolytes and Their Applications Applications of polyelectrolytes and theoretical models written by Sukant K. Tripathy and published by . This book was released on 2002 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Electrolytes Advances in Research and Application 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrolytes—Advances in Research and Application: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Electrolytes. The editors have built Electrolytes—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Electrolytes in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Electrolytes—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.

Download or read book Polyampholytes in Advanced Polymer Science and Emerging Technologies written by Sarkyt E. Kudaibergenov and published by CRC Press. This book was released on 2024-09-04 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyampholytes are unique polymers containing acid/base and/or anionic/cationic groups in the main or side chains. Water-soluble and water-swelling polyampholytes exhibit properties that provide broad potential as structural biomaterials, drug delivery and chemo-mechanical systems, biosensors, energy storage devices, supercapacitors, and actuators, among others. This monograph reviews the innovative studies in this field over the past two decades, with the aim to analyze and systematize the literature in the context of emerging technologies. Offers a multidisciplinary perspective covering polyampholytes, polybetaines, and polyzwitterions in nanotechnology, biotechnology, medicine, catalysis, environment protection, and oil industry applications Demonstrates a wide range of applications for these materials with enough depth to provide critical fundamental knowledge for new researchers in the field Discusses polyampholyte-protected and gel-immobilized metal nanoparticles and enzymes that catalyze reactions of hydrolysis, decomposition, hydrogenation, and oxidation of various substrates in batch-type and continuous flow–type reactors Highlights the remaining persistent challenges in the development and application of these materials This book will appeal to readers who conduct materials research for biomedical, water treatment, and environmental remediation applications.

Download or read book Electrical Phenomena at Interfaces and Biointerfaces written by Hiroyuki Ohshima and published by John Wiley & Sons. This book was released on 2012-02-14 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book bridges three different fields: nanoscience, bioscience, and environmental sciences. It starts with fundamental electrostatics at interfaces and includes a detailed description of fundamental theories dealing with electrical double layers around a charged particle, electrokinetics, and electrical double layer interaction between charged particles. The stated fundamentals are provided as the underpinnings of sections two, three, and four, which address electrokinetic phenomena that occur in nanoscience, bioscience, and environmental science. Applications in nanomaterials, fuel cells, electronic materials, biomaterials, stems cells, microbiology, water purificiaion, and humic substances are discussed.