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Polymer Structure and Dynamics in Nano-confinements

2015
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Release : 2015
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Book Synopsis Polymer Structure and Dynamics in Nano-confinements by : Wei-Shao Tung

Download or read book Polymer Structure and Dynamics in Nano-confinements written by Wei-Shao Tung. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Thelocal relaxations of polymers in cylindrical confinement are measured experimentally using QENS. When polystyrene is confined in cylindrical nanopores, the segmental relaxations slow down non-monotonically with pore size. This trend is also observed for EISF, which measured the fraction of non-diffusing hydrogen within the probing time scale of QENS. At last, we found that when d/R ee > 2, hydrogen has the lowest MSD. When the pore size is decreasing to 2 > d/Ree > 1, MSD is slightly higher but still lower than that for bulk PS. When the pore size is further decrease to d/Ree

Structure and Dynamics of Confined Polymers

2002-07-31 Science
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Release : 2002-07-31
Genre : Science
Kind : eBook
Book Rating : 975/5 ( reviews)

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Book Synopsis Structure and Dynamics of Confined Polymers by : John J. Kasianowicz

Download or read book Structure and Dynamics of Confined Polymers written by John J. Kasianowicz. This book was released on 2002-07-31. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are essential to biology because they can have enough stable degrees of freedom to store the molecular code of heredity and to express the sequences needed to manufacture new molecules. Through these they perform or control virtually every function in life. Although some biopolymers are created and spend their entire career in the relatively large free space inside cells or organelles, many biopolymers must migrate through a narrow passageway to get to their targeted destination. This suggests the questions: How does confining a polymer affect its behavior and function? What does that tell us about the interactions between the monomers that comprise the polymer and the molecules that confine it? Can we design and build devices that mimic the functions of these nanoscale systems? The NATO Advanced Research Workshop brought together for four days in Bikal, Hungary over forty experts in experimental and theoretical biophysics, molecular biology, biophysical chemistry, and biochemistry interested in these questions. Their papers collected in this book provide insight on biological processes involving confinement and form a basis for new biotechnological applications using polymers. In his paper Edmund DiMarzio asks: What is so special about polymers? Why are polymers so prevalent in living things? The chemist says the reason is that a protein made of N amino acids can have any of 20 different kinds at each position along the chain, resulting in 20 N different polymers, and that the complexity of life lies in this variety.

Nano-confinement Effects of Crystalline Walls on the Glass Transition of a Model Polymer

2013 Glass
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Release : 2013
Genre : Glass
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Book Synopsis Nano-confinement Effects of Crystalline Walls on the Glass Transition of a Model Polymer by : Mark Mackura

Download or read book Nano-confinement Effects of Crystalline Walls on the Glass Transition of a Model Polymer written by Mark Mackura. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: Efforts to understand the effect of confinement on the glass transition of an unentangled polymer melt in the field of coarse-grained simulations have focused on the use of free-standing and supported films with atomistically smooth substrates. The effects these types of nano-confinement have produced are of great value when trying to understand the interfacial effects on the structure and dynamics of the material that can dominate many properties at very small length scales (

Molecular Nano Dynamics

2009-09-09 Technology & Engineering
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Release : 2009-09-09
Genre : Technology & Engineering
Kind : eBook
Book Rating : 839/5 ( reviews)

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Book Synopsis Molecular Nano Dynamics by : Hiroshi Fukumura

Download or read book Molecular Nano Dynamics written by Hiroshi Fukumura. This book was released on 2009-09-09. Available in PDF, EPUB and Kindle. Book excerpt: From artificial surfaces to living cells, Molecular Nano Dynamics, Vol. I and Vol. II explores more than 40 important methods for dynamic observation of the nanoscale. Edited by absolute science greats from Japan, this two-volume set covers all important aspects of this topic: nanoscale spectroscopy and characterization tools, nanostructure dynamics, single living cell dynamics, active surfaces, and single crystals. Destined to be the definitive reference work on nanoscale molecular dynamics and their observation for years to come, this is a must-have reference for chemists, physicists, physical chemists, theoretical chemists, and materials scientists.

Dynamics in Geometrical Confinement

2014-06-03 Technology & Engineering
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Release : 2014-06-03
Genre : Technology & Engineering
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Book Rating : 003/5 ( reviews)

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Book Synopsis Dynamics in Geometrical Confinement by : Friedrich Kremer

Download or read book Dynamics in Geometrical Confinement written by Friedrich Kremer. This book was released on 2014-06-03. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the dynamics of low molecular weight and polymeric molecules when they are constrained under conditions of geometrical confinement. It covers geometrical confinement in different dimensionalities: (i) in nanometer thin layers or self supporting films (1-dimensional confinement) (ii) in pores or tubes with nanometric diameters (2-dimensional confinement) (iii) as micelles embedded in matrices (3-dimensional) or as nanodroplets. The dynamics under such conditions have been a much discussed and central topic in the focus of intense worldwide research activities within the last two decades. The present book discusses how the resulting molecular mobility is influenced by the subtle counterbalance between surface effects (typically slowing down molecular dynamics through attractive guest/host interactions) and confinement effects (typically increasing the mobility). It also explains how these influences can be modified and tuned, e.g. through appropriate surface coatings, film thicknesses or pore diameters. "Dynamics in Confinement" sums up the present state-of-the-art and introduces to the analytical methods of choice for the study of dynamics in nanometer-scale confinement.

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