scholarly journals Comparing water-mediated hydrogen-bonding in different polyelectrolyte complexes

Soft Matter ◽  
2019 ◽  
Vol 15 (39) ◽  
pp. 7823-7831 ◽  
Author(s):  
Piotr Batys ◽  
Samu Kivistö ◽  
Suvesh Manoj Lalwani ◽  
Jodie L. Lutkenhaus ◽  
Maria Sammalkorpi
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Molecular Dynamics Simulations ◽  
Water Diffusion ◽  
Polyelectrolyte Complexes ◽  
Dynamics Simulations ◽  
Influence Of Hydration ◽  
Specific Influence

All-atom molecular dynamics simulations are used to investigate the polyelectrolyte-specific influence of hydration and temperature on water diffusion in hydrated polyelectrolyte complexes (PECs).

Geometry of OH⋯O interactions in the liquid state of linear alcohols from ab initio molecular dynamics simulations

2020 ◽  
Vol 22 (12) ◽  
pp. 6690-6697 ◽  
Author(s):  
Aman Jindal ◽  
Sukumaran Vasudevan
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Ab Initio ◽  
Molecular Dynamics Simulations ◽  
Liquid State ◽  
Crystalline State ◽  
Md Simulations ◽  
Ab Initio Molecular Dynamics ◽  
Linear Alcohols ◽  
Dynamics Simulations

Hydrogen bonding OH···O geometries in the liquid state of linear alcohols, derived from ab initio MD simulations, show no change from methanol to pentanol, in contrast to that observed in their crystalline state.

scholarly journals Insight into Cellulose Dissolution with the Tetrabutylphosphonium Chloride–Water Mixture using Molecular Dynamics Simulations

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 627 ◽  
Author(s):  
Brad Crawford ◽  
Ahmed E. Ismail
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Molecular Dynamics Simulations ◽  
Water Solution ◽  
Water Concentration ◽  
High Water ◽  
Water Mixture ◽  
Cellulose Dissolution ◽  
Working Together ◽  
Dynamics Simulations

All-atom molecular dynamics simulations are utilized to determine the properties and mechanisms of cellulose dissolution using the ionic liquid tetrabutylphosphonium chloride (TBPCl)–water mixture, from 63.1 to 100 mol % water. The hydrogen bonding between small and large cellulose bundles with 18 and 88 strands, respectively, is compared for all concentrations. The Cl, TBP, and water enable cellulose dissolution by working together to form a cooperative mechanism capable of separating the cellulose strands from the bundle. The chloride anions initiate the cellulose breakup, and water assists in delaying the cellulose strand reformation; the TBP cation then more permanently separates the cellulose strands from the bundle. The chloride anion provides a net negative pairwise energy, offsetting the net positive pairwise energy of the peeling cellulose strand. The TBP–peeling cellulose strand has a uniquely favorable and potentially net negative pairwise energy contribution in the TBPCl–water solution, which may partially explain why it is capable of dissolving cellulose at moderate temperatures and high water concentrations. The cellulose dissolution declines rapidly with increasing water concentration as hydrogen bond lifetimes of the chloride–cellulose hydroxyl hydrogens fall below the cellulose’s largest intra-strand hydrogen bonding lifetime.

scholarly journals A Theoretical Study on Trehalose + Water Mixtures for Dry Preservation Purposes

Molecules ◽  
2020 ◽  
Vol 25 (6) ◽  
pp. 1435
Author(s):  
Amit Kumar ◽  
Alberto Cincotti ◽  
Santiago Aparicio
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Molecular Dynamics Simulations ◽  
Theoretical Study ◽  
Mixture Composition ◽  
Detailed Characterization ◽  
Local Dynamics ◽  
Water Structuring ◽  
Dynamics Simulations

The properties of trehalose + water mixtures are studied as a function of mixture composition and temperature using molecular dynamics simulations. As trehalose disaccharide has been proposed for dry preservation purposes, the objective of this work is to analyse the nanoscopic properties of the considered mixtures, in terms of aggregation, clustering, interactions energies, and local dynamics, and their relationships with hydrogen bonding. The reported results allow a detailed characterization of hydrogen bonding and its evolution with mixture composition and thus inferring the effects of trehalose on water structuring providing results to justify the mechanisms of trehalose acting as preservation agent.

Ab-Initio Molecular Dynamics Simulations and Calculations of Spectroscopic Parameters in Hydrogen-Bonding Liquids in Confinement (Project 8)

2018 ◽  
Vol 232 (7-8) ◽  
pp. 973-987 ◽  
Author(s):  
Daniel Sebastiani
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bonding ◽  
Molecular Dynamics Simulations ◽  
Density Functional ◽  
Ab Initio Molecular Dynamics ◽  
Aqueous Mixtures ◽  
Functional Theory ◽  
Spatially Resolved ◽  
Local Strength ◽  
Dynamics Simulations

Abstract We investigate the effect of several nanoscale confinements on structural and dynamical properties of liquid water and binary aqueous mixtures. By means of molecular dynamics simulations based on density functional theory and atomistic force fields. Our main focus is on the dependence on the structure and the hydrogen-bonding-network of the liquids near the confinement interface at atomistic resolution. As a complementary aspect, spatially resolved profiles of the proton NMR chemical shift values are used to quantify the local strength of the hydrogen-bond-network.

Protein-polyelectrolyte complexes: Molecular dynamics simulations and experimental study

Polymer ◽  
2017 ◽  
Vol 113 ◽  
pp. 39-45 ◽  
Author(s):  
Alina A. Sofronova ◽  
Diana B. Evstafyeva ◽  
Vladimir A. Izumrudov ◽  
Vladimir I. Muronetz ◽  
Pavel I. Semenyuk
Keyword(s):  
Molecular Dynamics ◽  
Experimental Study ◽  
Molecular Dynamics Simulations ◽  
Polyelectrolyte Complexes ◽  
Dynamics Simulations
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