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A tribo-chemical view on astringency of plant-based food substances

Friction 2024年第7期12卷 1392-1407页

作者： Samuel S.GAMANIEL Paloma S.DUEÑAS ROBLES Hans TROMP Els H.A.de HOOG sissi de beer Emile van der HEIde Laboratory for Surface Technology and Tribology Faculty of Engineering TechnologyUniversity of TwenteEnschede 7522 LWthe Netherlands NIZO Food Research B.V. Ede6710 BAthe Netherlands department of Molecules and Materials MESA+Institute for Nanotechnology University of TwenteEnschede 7500 AEthe Netherlands

Consumption of plant-based food products having high composition of polyphenols leads to the sensation of *** sliding oral surfaces,friction is an essential property during the oral perception of roughness and dryness which are attributes associated with *** factors including the chemical composition of interacting layers,structure and operation of interfaces have an effect on the astringency development *** manner of interactions occurring at oral interfaces suggest there is a system dependence of astringency and highlights the importance of adopting a tribosystems *** measurement techniques have shown an existing relationship between salivary protein-polyphenol interaction and an astringent ***,the tribo-chemistry involved in this multifaceted sensation remains largely unexplored in a comprehensive *** this review the underlying tribo-chemical processes useful in understanding the mechanism of astringency are highlighted and discussed considering current techniques employed to investigate astringency *** of lubrication on oral surfaces owing to the tribo-chemical interactions involving saliva and astringent plant proteins requires subsequent deformations of oral tissues which are significant enough to induce strains at mechanoreceptor locations,leading to the sensation of *** is proposed that micro-scale contact modelling on the interaction of food particles/aggregates,boundary layers and oral surfaces shows potential in addressing the knowledge gap between tribo-chemical measurement techniques and panel tests,making it possible to attain a predictor for astringency.

关键词： oral lubrication astringency tribo-chemistry tribology

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On the friction and adhesion hysteresis between polymer brushes attached to curved surfaces: Rate and solvation effects

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Friction 2015年第2期3卷 148-160页

作者： sissi de beer G.DjuidjéKENMOÉ Martin H.MÜSER Materials Science and Technology of Polymers MESA+Institute for NanotechnologyUniversity of TwenteP.O.Box 2177500 AE Enschedethe Netherlands Jülich Supercomputing Centre Institute for Advanced Simulation FZ Jülich 52425 JülichGermany department of Physics Laboratory of Mechanics Faculty of ScienceUniversity of YaoundéP.O.Box 812YaoundéCameroon

Computer simulations of friction between polymer brushes are usually simplified compared to real systems in terms of solvents and *** most simulations,the solvent is only implicit with infinite compressibility and zero *** addition,the model geometries are parallel walls rather than curved or rough as in *** this work,we study the effects of these approximations and more generally the relevance of solvation on dissipation in polymer-brush systems by comparing simulations based on different solvation *** find that the rate dependence of the energy loss during the collision of brush-bearing asperities can be different for explicit and implicit ***,the non-Newtonian rate dependences differ noticeably between normal and transverse motion,i.e.,between head-on and off-center asperity ***,when the two opposing brushes are made immiscible,the friction is dramatically reduced compared to an undersaturated miscible polymer-brush system,irrespective of the sliding direction.

关键词： polymer brushes biomimetic materials molecular dynamics simulation

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刺激响应聚合物刷调控表面粘弹力及摩擦力的研究

刺激响应聚合物刷调控表面粘弹力及摩擦力的研究

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中国化学会2017全国高分子学术论文报告会

作者：于云龙 sissi de beer Julius Vancso 张仕勇四川大学生物材料工程研究中心 University of Twente

粘弹力与摩擦力在自然界及人们的日常生活中随处可见,实现对其可调控性在智能响应领域有着重要的作用与意义。本文利用原子力显微镜对接枝在硅片上的刺激响应聚合物刷PNIPAM进行了系统地可调控粘弹力及摩擦力的研究。随着体系温度的升高... 详细信息

粘弹力与摩擦力在自然界及人们的日常生活中随处可见,实现对其可调控性在智能响应领域有着重要的作用与意义。本文利用原子力显微镜对接枝在硅片上的刺激响应聚合物刷PNIPAM进行了系统地可调控粘弹力及摩擦力的研究。随着体系温度的升高,聚合物刷的高度逐渐减小,而其粘弹力却逐渐升高。当温度高于LCST后,聚合物刷完全塌陷,其粘弹力也达到最高值。然而其摩擦力的最高值却出现在LCST附近,这是因为部分塌陷的聚合物刷被探针拉扯伸直,造成了很大的能量损耗。同时,PNIPAM又是非共溶剂响应的聚合物,在乙醇与水的不同配比中也表现出不同的粘弹力与摩擦力。其最大摩擦力出现在10%的乙醇/水溶液中,而最大的粘弹力在30%处。通过不断调控溶剂的配比,该聚合物刷体系可以实现在溶剂中对二氧化硅纳米粒子的控制与释放,从而降低了纳米粒子的团聚。本文的研究内容在智能响应领域有着重要的探究与指导意义。

关键词：聚合物刷摩擦力刺激响应粘弹力原子力显微镜

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