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Structure and Dynamics of Confined Polymers

2012-12-06 Science
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Release : 2012-12-06
Genre : Science
Kind : eBook
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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 2012-12-06. 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.

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 a 1,4-Polybutadiene Melt in Confinement

2023*
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Release : 2023*
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Book Synopsis Structure and Dynamics of a 1,4-Polybutadiene Melt in Confinement by : Lama Tannoury

Download or read book Structure and Dynamics of a 1,4-Polybutadiene Melt in Confinement written by Lama Tannoury. This book was released on 2023*. Available in PDF, EPUB and Kindle. Book excerpt: The study of the structure and dynamics of polymers confined by solid surfaces, enhances our knowledge about the properties of composite materials. The topic has been a desired area of study given the development of its applications. In such systems, the macromolecules are responsible for the general performance of the whole system. Therefore, understanding the effect of the confinement on the structure and dynamics of polymers is crucial for the advancement of the field. It has been shown that conformations and dynamics of polymer melts confined to thin films and flat surfaces as well as cylindrical pores are altered in comparison with the bulk. The change in properties depends on several factors including but not limited to the geometry of confinement. In our research, we study the effects of both the nanoscopic confinement and curvature on the dynamics and properties of a chemically realistic united atom model of a 1,4-Polybutadiene (PBD) melt using Molecular Dynamics (MD) simulations. Therefore, we divide our work into two systems: one with a PBD melt confined in a cylindrical nanopore and the other with a PBD melt surrounding a cylindrical nanorod. In both systems, the effects induced by the confinement on the melt's structure and dynamics on several scales are examined and compared.

Polymers in Confined Environments

2003-07-01 Technology & Engineering
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Release : 2003-07-01
Genre : Technology & Engineering
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Book Rating : 11X/5 ( reviews)

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Book Synopsis Polymers in Confined Environments by : Steve Granick

Download or read book Polymers in Confined Environments written by Steve Granick. This book was released on 2003-07-01. Available in PDF, EPUB and Kindle. Book excerpt: The rapidly-developing field of confined polymers is reviewed in this volume. Special emphasis is given to polymer aspects of this interdisciplinary problem. Taken together, the contributions offer ample evidence of how the field of polymer science continues to evolve with the passage of time. The topics revolve around the tendency of surfaces to impede chain relaxation and to stimulate new sorts of chain organization. These have been implicated in a variety of spectacular phenomena. Here is a listing of authors and affiliations: K. Binder (Johannes Gutenberg-Universität Mainz, Germany); P.-G. de Gennes (College de France, France); E.P. Giannelis, R. Krishnamoorti, and E. Manias (Cornell University and University of Houston, USA); G.S. Grest (Exxon Research and Engineering Co., USA); L. Leger, E. Raphael, and H. Hervet (College de France, France); S.-Q. Wang (Case Western Reserve University, USA).

Structure of Rigid Polymers Confined to Nanoparticles

2016
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Release : 2016
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Book Synopsis Structure of Rigid Polymers Confined to Nanoparticles by :

Download or read book Structure of Rigid Polymers Confined to Nanoparticles written by . This book was released on 2016. Available in PDF, EPUB and Kindle. Book excerpt: Nanoparticles (NPs) grafted with organic layers form hybrids able to retain their unique properties through integration into the mesoscopic scale. The organic layer structure and response often determine the functionality of the hybrids on the mesoscopic length scale. Using molecular dynamics (MD) simulations, we probe the conformation of luminescent rigid polymers, dialkyl poly(p-phenylene ethynylene)s (PPE), end-grafted onto a silica nanoparticle in different solvents as the molecular weights and polymer coverages are varied. We find that, in contrast to NP-grafted flexible polymers, the chains are fully extended independent of the solvent. In toluene and decane, which are good solvents, the grafted PPEs chains assume a similar conformation to that observed in dilute solutions. In water, which is a poor solvent for the PPEs, the polymer chains form one large cluster but remain extended. The radial distribution of the chains around the core of the nanoparticle is homogeneous in good solvents, whereas in poor solvents clusters are formed independent of molecular weights and coverages. As a result, the clustering is distinctively different from the response of grafted flexible and semiflexible polymers.

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