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| 1 | A novel cellulose hydrogel prepared from its ionic liquid solution显示文摘A novel cellulose hydrogel is prepared by regenerating cellulose from its ionic liquid solution. The transparency cellulose hydrogel presents a good chemical stability and an acceptable mechanical property. This non-toxic cellulose hydrogel should be biocompatible and may be useful in the future as a biomaterial. | LI Lu LIN ZhangBi YANG Xiao WAN ZhenZhen CUI ShuXun | 2009 | Chinese Science Bulletin2009，54，9： | 6 |
| 2 | Detecting van der Waals forces between a single polymer repeating unit and a solid surface in high vacuum显示文摘Ubiquitous van der Waals(vdW)forces are very importa nt for nano structures.Although the vdW forces between two surfaces(or two layers)have been measured for several decades,a direct detection at the single-molecule level is still difficult.Herein,we report a novel method to solve this problem in high vacuum by means of AFM-based sin gle-molecule force spectroscopy(SMFS).Solve nt molecules and surface adsorbed water are removed thoroughly under high vacuum so that the situation is greatly simplified.A constant force plateau can be observed when a polymer chain is peeled off from a substrate in high vacuum.Accordingly,the vdW forces between one polymer repeating unit and the substrates can be obtained.The experimental results show that the vdW forces(typical range:21-54 pN)are dependent on the species of substrates and the size of polymer repeating unit,which is in good accordance with the theoretical results.It is expected that this novel method can be applied to detect other non-covalent interactions(such as hydrogen bond andπ-πstacking)at the single-molecule level in the future. | Wanhao Cai Chen Xiao Linmao Qian Shuxun Cui | 2019 | Nano Research2019，12，1： | 4 |
| 3 | Effect of concentration of wool keratin on the rebuilding of disulfur bond显示文摘We demonstrate the effect of concentration of extracted keratin on the rebuilding of disulfur bond during dialysis against deionized water: cross-linked networks can be formed in the aggregate when the concentration is high, whereas at low concentration, intramolecular disulfur bond is preferred. This preliminary study illustrates, for the first time, the potential of controlling the cross-linking between keratin chains by facile means without addition of other chemicals, which is helpful to construct the biomacromolecular self-assemblies. | YANG Xiao LIN ZhangBi CUI ShuXun | 2007 | Chinese Science Bulletin2007，52，20： | 1 |
| 4 | Maskless and low-destructive nanofabrication on quartz by friction-induced selective etching显示文摘 | SONG Chenfei LI Xiaoying CUI Shuxun | 2013 | Nanoscale Research Letters2013，8，： | 1 |
| 5 | Muhilayer Assemblies of Copolymer PSOH and PVP on the Basis of Hydrogen Bonding显示文摘 | Liyan Wang Shuxun Cui Zhiqiang Wang | 2000 | Langmuir2000，16，10： | 1 |
| 6 | Effects of Environments on the Noise of Atomic Force Microscopy Cantilevers显示文摘Thermal vibration of the cantilevers is the main source of noise in atomic force microscopy(AFM).When immersed in liquids,the dynamic behavior of the cantilevers will be significantly affected by the environment.In this study,the effects of environments on the noise of AFM were investigated.The results show that the V⁃shaped cantilever exhibited very low noise in high vacuum.The noise in atmospheric environment was also satisfactory.In liquid environments,the noise dramatically increased.The systematic noise was low and dependent on the distance between the tip and substrate.As the velocity increased,the noise of V⁃shaped cantilever was increased in a similar trend.It is also found that the variation trend was more pronounced as the liquid viscosity increased.The noise of rectangular cantilever was lower than that of V⁃shaped cantilever in the same environment.The present study indicates that high vacuum is an ideal environment for single molecule force spectroscopy(SMFS)due to the lower noise and higher resolution.For a better signal⁃to⁃noise ratio,both the cantilever velocity and liquid viscosity should be as low as possible.These results will be helpful when a lower noise is desired in weak force detection. | Hongyu Ju Song Zhang Shuxun Cui | 2020 | Journal of Harbin Institute of Technology(New Series)2020，27，4： | 1 |
| 7 | Single chain elasticity of poly(ferrocenylmdimethylsilane) and poly(ferrocenylethylphenylsilane)显示文摘 | Weiqing Shi Shuxun Cui Chi Wang Liyan Wang Xi Zhang | 2004 | Macromolecules2004，37，： | 1 |
| 8 | Multilayer Assemblies of Copolymer PSOH and PVP on the Basis of Hydrogen Bonding显示文摘 | Liyan Wang Shuxun Cui Zhiqiang Wang | 2000 | Langmuir2000，16，10： | 1 |
| 9 | Studies on quantum dots synthesized in aqueous solution for biological labeling via electrostatic interaction 显示文摘 | Lin Zhangbi Cui Shuxun Zhang Hao | 2003 | Analytical Biochemistry2003，319，： | 1 |
| 10 | Intramolecular hydrogen bonds in a single macromolecule:Strength in high vacuum versus liquid environments显示文摘As a weak non-covalent interaction,hydrogen bond(H-bond)is highly susceptible to the environmental interference.However,the direct quantification of a single H-bond under an interference-free condition is still a challenge.Herein,the intramolecular H-bond in a model system,poly(N-isopropylacrylamide),is studied in high vacuum by single-molecule atomic force microscopy and steered molecular dynamics simulations,which allows the precise quantification of H-bond strength in an interference-free state.Control experiments show that the H-bond is significantly weakened in nonpolar solvent,even if the dielectric constant is very close to vacuum.If a polar solvent is used as the environment,the H-bond will be further weaker or even broken.These results imply that for experiments in any liquid environment,the H-bond strength(△G)will be only -50% or even less of that measured in vacuum.Further analysis shows that in liquid environments,AG decays in a quasi-linear way with the increase of the dielectric constant(ε).For H-bond studies in future,the result measured in vacuum can be set as the standard value,namely,the inherent strength.This approach will provide fundamental insights into the H-bond participated nano-structures and materials in different environments. | Wanhao Cai Duo Xu Fa Zhang Junhao Wei Song Lu Linmao Qian Zhongyuan Lu Shuxun Cui | 2022 | Nano Research2022，15，2： | 0 |
| 11 | A targeted QTL analysis for fiber length using a genetic population between two introgressed backcrossed inbred lines in upland cotton(Gossypium hirsutum)显示文摘Cotton fiber is the most important natural raw material for the textile industry, and fiber length(FL) is one of the most important traits in cotton.Quantitative trait locus(QTL)mapping based on high-density genetic maps is an efficient approach to identify genetic regions for FL.In our study, two backcrossed inbred lines(BILs) were chosen as parents to construct a high-density genetic map in F2 which was used to fine map FL QTL in F2:3 population.The genetic map had a total size of 3462.8 cM, containing 9182 singlenucleotide polymorphisms(SNPs) based on genotyping-by-sequencing.Two FL related stable QTL were identified on two chromosomes(qFL-A08–1 on A08 and qFL-D03–1 on D03),and qFL-A08–1 was confirmed by a meta-analysis.Utilizing previously obtained RNA-seq data for the two BILs and qRT-PCR analysis, two candidate genes annotated as cytochrome b5(CB5, Gh_A08 G1729) and microtubule end-binding 1 C(EB1C, Gh_D03 G0232) that may regulate FL during the fiber elongation stage were identified.In addition, nine recombination hotspots in this population were found.The results of this study will provide an important foundation for further studies on the molecular and genetic regulation of fiber elongation. | Guoyuan Liua Wenfeng Pei Dan Li Jianjiang Ma Yupeng Cui Nuohan Wang Jikun Song Man Wu Libei Li Xinshan Zang Shuxun Yu Jinfa Zhang Jiwen Yu | 2019 | The Crop Journal2019，7，3： | 0 |
| 12 | Understanding the Conformational Interconversions of a Polymer Chain in a Liquid Environment at the Single-molecule Level显示文摘The conformational interconversions of polymer chains have been of great interest as a basic scientific issue.Single-molecule force spectroscopy(SMFS)is a powerful tool for molecular manipulation,which enables experimental studies on the single-chain behaviors of polymers.The SMFS results show that an individual polymer chain in a liquid environment may have similar properties to an ideal chain,which contradicts the traditional theoretical view.Herein,by taking into account the collisions of solvent molecules,the conformational interconversions of a single polymer chain in a liquid environment have been analyzed.The conformational interconversion frequency of a carbon-carbon bond of an alkane chain can be estimated by establishing the relationship between the internal rotation barriers of small molecules(monomers)and the corresponding macromolecules.Since the time scale of conformational interconversions of the polymer backbone is much shorter than that of SMFS experiments,most polymers with C-C backbones behave as ideal chains in liquid environments. | SHAO Yue WEI Junhao BAO Yu CAI Wanhao QIAN Lu CUI Shuxun | 2023 | Chemical Research in Chinese Universities2023，39，5： | 0 |
| 13 | Force-Induced Enhancement of Hydrophilicity of Individual Polymethyl Methacrylate Chain显示文摘Comprehensive Summary,Polymethyl methacrylate(PMMA)has been widely applied in diverse fields such as medicine and engineering materials due to its good hydrophilicity and biocompatibility.However,another term for PMMA,Plexiglas,means that it is water insoluble.These features of PMMA are valuable but seem paradoxical.To explore the underlying mechanism of the paradoxical properties,the interactions between PMMA and water have been investigated by atomic force microscopy(AFM)-based single-molecule force spectroscopy(SMFS).The single-chain elasticity of PMMA obtained in aqueous solutions is significantly different from that obtained in non-aqueous environments,implying that PMMA can form hydrogen bonds with water molecules. | Wenping Kang Yu Bao Hailong Wang Nanpu Cao Shuxun Cui | 2023 | Chinese Journal of Chemistry2023，41，18： | 0 |
| 14 | Effect of chain length on the conformation and friction behaviour of DNA显示文摘Four double-stranded DNA films with different chain lengths were prepared on 3-aminopropyltriethoxysilane(APS)-modified mica surfaces in the NaCl solution with concentration ranging from 0.001 to 0.1 M.By using an atomic force microscope,the force-distance curves and friction behaviour of each DNA film were studied in the NaCl solution that was used in the sample preparation.When adsorbed on mica as films in salt solution,the conformation of DNA molecules would be a combination of loops and'train-like'.As the chain length increased from 50 to 20000 bp,the extension rate of DNA film increased from 7.1to 11.5 in 0.001 mol/L NaCl solution,which suggested that the DNA molecule with long chain likely resulted in more extended conformation.In addition,under low normal load,low NaCl concentration could increase the friction of DNA film and the chain length revealed insignificant effect on the friction force of DNA film.Therefore,long chain DNA with low salt concentration is more conducive to the nanopore sequencing process,since extended conformation can make DNA molecules easier to reach into nanopore and the high friction can reduce the translocation speed.These results may benefit the development of the third-generation sequencing technique based on nanopore. | WANG Mian CUI ShuXun YU BingJun QIAN LinMao | 2013 | Science China(Technological Sciences)2013，56，12： | 0 |
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