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1091-專題演講-1100106-張正宏(交大物研所)

演講活動
張貼人:李明芳公告日期:2020-08-18
  
Time1100106 (Wed.) 14:20~16:20
SpeakerProf.張正宏(CHANG, Cheng-Hung)
國立交通大學物理研究所/Institute of Physics, National Chiao Tung University
TitleChemical potential formalism for entropic forces of confined polymers
AbstractIn this talk, we will introduce an entropic force formula for partly confined polymers and demonstrate its mathematical equivalence with the well-known chemical potential formula for solutions. It leads to an interesting cross-disciplinary correspondence between polymer physics, granular chains, and chemistry. In analytical studies, the magnitudes of the recoiling, tension, and drift entropic forces are derived for 2D strips, 3D tubes, and 3D slits, with both hard and soft boundaries. In numerical experiments, the force magnitudes extracted by the Jarzynski equality and a recursion formula highly coincide with those obtained from the analytical study. With this formalism, the strengths of various polymer entropic forces are systematically evaluated for different polymers and confinements. Remarkably, the result clarifies the force magnitudes inferred in several recent granular and polymer experiments, including the confined granular chains on a vibrating platform and DNA recoiling and tug-of-war in nanochannels, nanopillar arrays, and nanoslits. More generally, it predicts the yet-unknown force strengths in a variety of biological confined polymers and polymers in single-molecule or microfluidic experiments. According to this analysis, 20 pN seems to be close to the maximum entropic force one can observe in nature for a recoiling polymer.
Reference: H.-Q. Xie & C.-H. Chang, Chemical potential formalism for polymer entropic forces, Communications Physics 2, 24 (2019).
https://rdcu.be/bo2VB
PlaceB101, Gongquan Campuses, NTNU

最後修改時間:2021-01-04 AM 8:34

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單位簡介

本系的重點研究領域包括:凝態物理、光電與奈米科學、高能與粒子物理、軟凝態物理與生物物理、原分子光學物理、及物理科學教育等。本系前身為臺灣省立師範學院理化系物理組,成立於民國三十五年(1946年)本校創校之始。民國五十一年(1962年)本系獨立成系,民國六十三年(1974年)成立物理研究所碩士班,民國八十年(1991年)成立研究所博士班。長久以來,本系肩負著培育臺灣中等學校物理科師資的重任,但也不忘在物理學術研究上求新求進步。至今本系培育出的學術人才已有一位中研院院士及近百位中研院研究員及大學教授,各行各業的高科技人材更是不勝枚舉。民國八十三年師資培育法改制後,本系已升級為尖端學術研究、科技應用研發、及中學師資培育三者齊備的系所。

  • 國立臺灣師範大學物理系系友會
  • 系友會線上小額捐款
  • 徐有庠盃-臺灣青年學生物理辯論競賽
  • 國際物理奧林匹亞競賽
  • 公用場地與儀器設施預約系統
  • 學生實習專區
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