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Morphologies of a spherical bimodal polyelectrolyte brush induced by polydispersity and solvent selectivity

Chinese Physics B 2021年第6期30卷 637-647页

作者： Qing-Hai Hao Jie Cheng College of Science Civil Aviation University of ChinaTianjin 300300China

It is commonly realized that polydispersity may significantly affect the surface modification properties of polymer brush systems. In light of this, we systematically study morphologies of bidisperse polyelectrolyte brush grafted onto a spherical nanocolloid in the presence of trivalent counterions using molecular dynamics simulations. Via varying polydispersity, grafting density, and solvent selectivity, the effects of electrostatic correlation and excluded volume are focused, and rich phase behaviors of binary mixed polyelectrolyte brush are predicted, including a variety of pinned-patch morphologies at low grafting density and micelle-like structures at high grafting density. To pinpoint the mechanism of surface structure formation, the shape factor of two species of polyelectrolyte chains and the pair correlation function between monomers from different polyelectrolyte ligands are analyzed carefully. Also, electrostatic correlations, manifested as the bridging through trivalent counterions, are examined by identifying four states of trivalent counterions. Our simulation results may be useful for designing smart stimuli-responsive materials based on mixed polyelectrolyte coated surfaces.

关键词： surface morphologies polydisperse polyelectrolyte brush solvent selectivity molecular dynamics simulation

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solvent Selection for Extractive Distillation by the Universal Quasichemical Functional Group Activity Coefficient(UNIFAC) Group Contribution Method

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Chinese Journal of Chemical Engineering 2004年第6期12卷 862-868页

作者：崔现宝翟亚锐杨志才冯天扬张缨 State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Library of Tianjin University Tianjin 300072 China

A method to select solvent for extractive distillation is proposed by UNIFAC group contribution. solventselectivity can be divided into two parts: the partial combinatorial solvent selectivity and the partial residual solventselectivity. The properties of partial combinatorial and residual solvent selectivity are demonstrated. In most cases,the partial residual solvent selectivity is predominant. The candidate groups of solvent can be selected by groupinteraction parameter using UNIFAC group interaction parameter table as a guide.

关键词： solvent selection solvent selectivity UNIFAC group contribution extractive distillation

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Phase-selective graphene oxide membranes for advanced microfluidic flow control

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Microsystems & Nanoengineering 2016年第1期2卷 256-262页

作者： Jennifer Gaughran David Boyle James Murphy Robert Kelly Jens Ducrée School of Physical Sciences Dublin City UniversityDublin 9Ireland Biomedical Diagnostics Institute Dublin City UniversityDublin 9Ireland

For the first time,we harness the unique phase-selectivity of chip-integrated graphene oxide(GO)membranes to significantly enhance flow control on centrifugal microfluidic *** this paper,we present novel processes for the assembly of these GO membranes into polymeric microfluidic systems and demonstrate that multilayer GO membranes allow the passage of water while blocking pressurized air and organic solutions.

关键词： centrifugal microfluidics flow control graphene oxide membranes solvent selectivity

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