Transport Properties Of Polymer Solutions In Small Pores
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Transport Properties Of Polymer Solutions In Small Pores
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Author : Nino Grizzuti
language : en
Publisher:
Release Date : 1985
Transport Properties Of Polymer Solutions In Small Pores written by Nino Grizzuti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Polymerization categories.
Transport Properties Of Semidilute And Concentrated Polymer Solutions
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Author : Kiril A. Streletzky
language : en
Publisher:
Release Date : 1998
Transport Properties Of Semidilute And Concentrated Polymer Solutions written by Kiril A. Streletzky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Polymer solutions categories.
Transport Properties Of Polymeric Membranes
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Author : Sabu Thomas
language : en
Publisher: Elsevier
Release Date : 2017-11-20
Transport Properties Of Polymeric Membranes written by Sabu Thomas and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-20 with Science categories.
Transport Properties of Polymeric Membranes is an edited collection of papers that covers, in depth, many of the recent technical research accomplishments in transport characteristics through polymers and their applications. Using the transport through polymer membranes method leads to high separation efficiency, low running costs, and simple operating procedures compared to conventional separation methods. This book provides grounding in fundamentals and applications to give you all the information you need on using this method. This book discusses the different types of polymer, their blends, composites, nanocomposites and their applications in the field of liquid, gas and vapor transport. Some topics of note include modern trends and applications of polymer nanocomposites in solvent, vapor and gas transport; fundamentals and measurement techniques for gas and vapor transport in polymers; and transport properties of hydrogels. This handpicked selection of topics, and the combined expertise of contributors from global industry, academia, government and private research organizations, make this book an outstanding reference for anyone involved in the field of polymer membranes. Presents current trends in the field of transport of liquid, gas and vapor through various polymeric systems Features case studies focused on industrial applications of membrane technology, along with fundamentals of transport and materials Helps readers quickly look up a particular technique to learn key points, capabilities and drawbacks
Advanced Methods To Produce And Characterize Transport Properties Of Novel Nanoporous Polymers
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Author : Andrei Nicolae
language : en
Publisher:
Release Date : 2018
Advanced Methods To Produce And Characterize Transport Properties Of Novel Nanoporous Polymers written by Andrei Nicolae and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Nanopores categories.
In this work, experimental techniques, equipment, apparatuses, models, algorithms, and software codes were developed to explore the nanoporous structure of polyetherimide (PEI) created using the solid-state foaming process. First reported in 2001, researchers have wondered about the transport properties of this skin-covered nanoporous structure but no one had successfully developed the means to reliably produce, access, or characterize it. In this work, I developed techniques and equipment to produce flat, uniform, and dimensionally stable specimens with low variance. Then, I developed two unique methods to selectively and robustly remove the solid skin without damaging the underlying porous nanostructure. The resulting geometry brought about a fluid problem with peculiar boundary conditions, which has nontrivial solutions. Therefore, I solved the partial differential equations for these geometries in order to compute transport properties from experimental data. The full solution to this problem made use of analytic and numerical methods, software algorithms, and image processing. After developing the complete experimental and theoretical tool-sets, I obtained data on a wide range of nanoporous PEI structures, including permeability, diffusivity, tortuosity, and thermal conductivity. Permeability was found to be in the range of 10^-16 to 10^-15 m^2, comparable to that of limestone, volcanic rock, and sandstone. Diffusivities were in the range 0.01 - 0.025, comparable to very dense soil. Tortuosity, a property often wondered about by researchers beholding scanning electron micrographs (SEM) of this nanostructure, was computed from diffusivity and porosity data to be in the range 20 - 40. These are the first results on transport properties, some 15 years after the discovery of the nanostructure. During this doctoral work, several major discoveries were made. First, I found that PEI's nanostructure is impermeable to liquid water, however it allows gasses and wetting liquids (such as acetone and isopropyl alcohol) to freely flow through the structure. This phenomenon is similar to that exploited in the commercial polytetrafluoroethylene membrane GoreTEX. This waterproof-but-breathable property has many practical applications, especially given that PEI's nanostructure was shown to be waterproof at pressures of over 50 atmospheres, whereas GoreTEX can withstand less than 3 atmospheres. Additionally, I developed a new method to achieve a completely novel nanostructure in PEI by using a two-state foaming technique. These new nanostructures have a very unique appearance and resemble a hybrid of closed-cell and open-porous morphologies. Perhaps most notably, I also discovered a processing condition which produces PEI foams that are transparent. This is the first known occurrence of polymer foams with cells so small that light scattering is diminished to the point of optical clarity. The cells are so small that our SEM techniques were inadequate in imaging the structure. Only a few voids on the order of 10 nanometers were visible. However, the structure was found to be open-porous as well as optically transparent, similar to Aerogel, but a polymer. Lastly, I performed a feasibility study on 3D printing polymer bubbles. The idea was to create a nozzle that jets a stream of individual liquid polymer bubbles at high frequency, and deposit them in layers to create a 3D object. Although further work is necessary, I demonstrated the vision using liquid latex, butter, and paraffin wax as working materials, having successfully developed nozzles and techniques to create and release bubbles encapsulated by these substances. The most significant aspect of my work isn't in the fact that I was first in 15 years to obtain transport property data on nanoporous PEI, but in creating the experimental and theoretical tools as a platform for much broader future research in this field.
Polymer Solutions
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Author : Iwao Teraoka
language : en
Publisher: John Wiley & Sons
Release Date : 2004-04-07
Polymer Solutions written by Iwao Teraoka and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-04-07 with Science categories.
Polymer Solutions: An Introduction to Physical Properties offers a fresh, inclusive approach to teaching the fundamentals of physical polymer science. Students, instructors, and professionals in polymer chemistry, analytical chemistry, organic chemistry, engineering, materials, and textiles will find Iwao Teraoka’s text at once accessible and highly detailed in its treatment of the properties of polymers in the solution phase. Teraoka’s purpose in writing Polymer Solutions is twofold: to familiarize the advanced undergraduate and beginning graduate student with basic concepts, theories, models, and experimental techniques for polymer solutions; and to provide a reference for researchers working in the area of polymer solutions as well as those in charge of chromatographic characterization of polymers. The author’s incorporation of recent advances in the instrumentation of size-exclusion chromatography, the method by which polymers are analyzed, renders the text particularly topical. Subjects discussed include: Real, ideal, Gaussian, semirigid, and branched polymer chains Polymer solutions and thermodynamics Static light scattering of a polymer solution Dynamic light scattering and diffusion of polymers Dynamics of dilute and semidilute polymer solutions Study questions at the end of each chapter not only provide students with the opportunity to test their understanding, but also introduce topics relevant to polymer solutions not included in the main text. With over 250 geometrical model diagrams, Polymer Solutions is a necessary reference for students and for scientists pursuing a broader understanding of polymers.
Conducting Polymers
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Author : György Inzelt
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-03-23
Conducting Polymers written by György Inzelt and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-03-23 with Science categories.
This second edition of a well-received volume has been thoroughly updated and expanded to cover the most recent developments. Coverage now includes additional polymers such as polyindole and polyazines, composites of polymers with carbon nanotubes, metals, and metal oxides, as well as bending-beam techniques for characterization. Again, the author provides a systematic survey of the knowledge accumulated in this field in the last thirty years. This includes thermodynamic aspects, the theory of the mechanism of charge transport processes, the chemical and physical properties of these compounds, the techniques of characterization, the chemical and electrochemical methods of synthesis as well as the application of these systems. The book contains a compilation of the polymers prepared so far and covers the relevant literature with almost 2000 references. From reviews of the previous edition ‘a comprehensive reference guide for those interested in this field’ (Journal of Solid State Electrochemistry)
Masters Theses In The Pure And Applied Sciences
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Author : Wade H. Shafer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Masters Theses In The Pure And Applied Sciences written by Wade H. Shafer and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Masters Theses in the Pure and Applied Sciences was first conceived, published, SIld disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna and broader dissemination. tional publishing house to assure improved service Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 30 (thesis year 1985) a total of 12,400 theses titles from 26 Canadian and 186 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work.
Handbook Of Polymers For Pharmaceutical Technologies Processing And Applications
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Author : Vijay Kumar Thakur
language : en
Publisher: John Wiley & Sons
Release Date : 2015-07-27
Handbook Of Polymers For Pharmaceutical Technologies Processing And Applications written by Vijay Kumar Thakur and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-27 with Technology & Engineering categories.
Polymers are one of the most fascinating materials of the present era finding their applications in almost every aspects of life. Polymers are either directly available in nature or are chemically synthesized and used depending upon the targeted applications. Advances in polymer science and the introduction of new polymers have resulted in the significant development of polymers with unique properties. Different kinds of polymers have been and will be one of the key in several applications in many of the advanced pharmaceutical research being carried out over the globe. This 4-partset of books contains precisely referenced chapters, emphasizing different kinds of polymers with basic fundamentals and practicality for application in diverse pharmaceutical technologies. The volumes aim at explaining basics of polymers based materials from different resources and their chemistry along with practical applications which present a future direction in the pharmaceutical industry. Each volume offer deep insight into the subject being treated. Volume 1: Structure and Chemistry Volume 2: Processing and Applications Volume 3: Biodegradable Polymers Volume 4: Bioactive and Compatible Synthetic/Hybrid Polymers
Voltage Responsive Transport Properties Of Ion Current Through Single Nanopores
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Author : Matthew R. Powell
language : en
Publisher:
Release Date : 2010
Voltage Responsive Transport Properties Of Ion Current Through Single Nanopores written by Matthew R. Powell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Conically shaped polymer nanopores exhibit unique transport properties such as, ion selectivity, current rectification, and voltage dependent ionic concentration enhancement inside the pore. These effects are all caused by the asymmetrical conical geometry and the charged surfaces of the pore walls. The charged pore walls create a region where ions from the surrounding solution are attracted at increased concentrations. The region of enhanced concentrations is on the same scale as the nanometer size pore diameters, thus causing a situation where the surface to volume ratio is very high and these surface effects dominate. The electric fields introduced from an applied voltage further influence the region of concentration enhancement and thus the transport properties. In this research we have investigated the effect of voltage dependent concentration enhancement on the ion current noise through the nanopore as well as the effect the concentration enhancement has on solubility inside the pore. We discovered that the conically shaped polymer nanopores used in this research show ion current fluctuations with voltage dependent 1/f noise characteristics. Under certain electrolyte concentrations, the 1/f noise characteristics are asymmetric with respect to the voltage polarity. When this is the case, the low conductance state shows normalized 1/f noise in equilibrium, independent of the voltage. When in the high conductance state, the normalized 1/f noise shows non-equilibrium, strong voltage dependent noise behavior. The voltage dependent concentration enhancement also causes conically shaped polymer nanopores to show negative incremental resistance and ion current oscillations under the addition of a small concentration of divalent cations to a buffered monovalent ionic solution. The ion current oscillations are caused by the transient formation and redissolution of nanoprecipitates inside the pore, which temporarily block the ion current. The concentration enhancement causes the species of the precipitate to rise above the solubility product inside the pore and form this blockage. This research contributes to the goal of using nanopores as devices and sensors through a better understanding of nanopore transport properties and processes occurring on the nanoscale.
The Effect Of Adsorbed Polymers On Solvent Flow And Molecular Diffusion In Small Pores
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Author : Wayne Keith Idol
language : en
Publisher:
Release Date : 1985
The Effect Of Adsorbed Polymers On Solvent Flow And Molecular Diffusion In Small Pores written by Wayne Keith Idol and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Polymer solutions categories.