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Segmental dynamics near the chain end of polystyrene in its ultrathin films:a study by single-molecule fluorescence de-focus microscopy

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Science China Chemistry 2014年第3期57卷 389-396页

作者： ZHENG ZhongLi LI DeSheng YANG JingFa ZHAO Jiang Beijing National Laboratory of Molecular Science Institute of Chemistry Chinese Academy of Sciences

Rotational motion of fluorophores chemically attached to polystyrene chain-ends in ultra-thin films on solid substrates was studied by single-molecule fluorescence de-focus *** collective feature of the rotational motion was found and evidenced by the sharp change of the population of fluorophores undergoing rotational motion within a very narrow temperature range(named as the changing temperature,T c).The T c value was found to depend on film thickness and interfacial chemistry and the variation of the T c value is also dependent on the molecular weight of the *** results demonstrate that the spatial confinement effect enhances the segmental mobility near the polymer chain-ends while the interfacial attraction restricts the segmental motion inside the thin film.

关键词： glass transition polymer thin film segmental motion single molecule fluorescence

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When does a diblock copolymer probe the interfacial rheological effect?

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Science China Chemistry 2016年第10期59卷 1330-1334页

作者： Jingfa Yang Jiang Zhao Institute of Chemistry Chinese Academy of Sciences

Lateral diffusion of diblock copolymer residing on the interfaces between two immiscible liquids is investigated at single molecular level. fluorescence correlation spectroscopy was used to study the diffusion of fluorescence-labeled diblock copolymer,polystyrene-b-polyisoprene, at the interface formed between two immiscible liquids. The interfaces are formed between N,N-dimethylformamide(DMF) and a few immiscible liquids, n-alkane and polyisoprene. Interfacial diffusion coefficient of the diblock copolymer probe is found to decrease monotonously with the increase of the molecular length of the interface constituting liquids. The decrease of diffusion coefficient follows the prediction by Einstein relation using the viscosity of the constituting liquids as the variables only for interfaces between DMF and very small n-alkanes. For interfaces formed between DMF and bigger alkanes and especially between DMF and polyisoprene, the diffusion coefficient is much higher than the calculated value,indicating that the probe molecule starts to probe the much less viscous interfacial region because the interfacial width gets larger,whose thickness is comparable to the molecule size of the liquids.

关键词： interfaces diffusion immiscible liquids single molecule fluorescence

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The quality control mechanism for the transloction of the outer membrane proteins in the periplasm of Gram-negative bacteria

The quality control mechanism for the transloction of the ou...

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第一届全国生物物理化学会议暨生物物理化学发展战略研讨会

作者： Si Wu~1,Xi Ge~2,Zeyong Zhi~1,and Zengyi Chang~2,Xin Sheng Zhao~(1,*) 1 Beijing National Laboratory for Molecular Sciences,State Key Laboratory for Structural Chemistry of Unstable and Stable Species,and Department of Chemical Biology,College of Chemistry and Molecular Engineering,Peking University,Beijing,100871,China 2 The Center for Protein Science,The National Laboratory of Protein Engineering and Plant Genetic Engineering,and College of Life Science,Peking University,Beijing,100871,China

＜正＞The outer membrane proteins（OMPs） of the Gram negative bacteria have to be translocated through the cytoplasm,the inner membrane,and the periplasmic space before reaching their final *** highly fluctuating nature of the periplasmic space,due to the high permeability of the outer membrane,engenders such translocation process inevitably challenging and would have to rely on an efficient quality control

关键词： outer membrane protein DegP single molecule fluorescence protein quality control

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