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Radiation synthesis and characterization of polyacrylic acid hydrogels

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Nuclear Science and Techniques 2007年第2期18卷 82-85页

作者： yang mingcheng SONG Hongyan ZHU Chengshen HE Suqin School of Materials Science and Engineering Zhengzhou University Zhengzhou 450052 China Isotope Institute of Henan Academy of Sciences Zhengzhou 450015 China

The pH-sensitive polyacrylic acid (PAA) hydrogels were synthesized by gamma-ray irradiation at an am- bient temperature. The influences of dose, monomer concentration, cross-linking agent content, pH, and ionic strength on the swelling ratio (SR) of the PAA hydrogels were investigated in detail. The results show that the SR of the hy- drogel decreases with an increase in the dose, monomer concentration, and cross-linking agent content. In alkaline so- lution, the SR of the hydrogels is much higher than that in acid solution. Also, the ionic strength can influence the SR of the hydrogels. The more the concentration, the lower the

关键词：聚丙烯酸水凝胶辐射合成特性

Preparation and Characterization of Fe3O4 Magnetic Nano-particles by ^（60）Co γ-ray Irradiation

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Journal of Materials Science & Technology 2007年第2期23卷 182-184页

作者： mingcheng yang Hongyan SONG Chengshen ZHU Suqin HE Ya GAO School of Material Science and Engineering Zhengzhou University Zhengzhou 450052 China Isotope Institute of Henan Academy of Sciences Zhengzhou 450015 China

By using a new method, ^60Co γ-ray irradiation, Fe3O4 magnetic nano-particles were successfully synthesized at room temperature under ambient pressure. The structure, morphology and magnetic properties of these nanoparticles were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM） and vibrating sample magnetometer （VSM）, respectively. The radiation formation mechanism was also discussed. The results show that the absorbed dose can greatly influence the structure, morphology and magnetic properties of the products. XRD and TEM studies show that the product prepared by γ-ray irradiation （10 kGy） is pure FesO4 phase and the mean diameter of these nano-particles is about 21 nm. The Fe3O4 nano-particles synthesized by γ-ray irradiation （10 kGy） are mainly in small cubic shape and the size uniformity of these particles is good.

关键词： ^60Co γ-ray Irradiation Fe304 nano-particles Super-paramagnetism

Synthesis and properties of p(NIPA-co-NVP)/clay hydrogels by radiation polymerization

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Nuclear Science and Techniques 2007年第1期18卷 55-58页

作者： SONG Hongyan yang mingcheng ZHU Chengshen HE Suqin GAO Ya School of Materials Science and Engineering Zhengzhou University Zhengzhou 450052 China Isotope Institute of Henan Academy of Sciences Zhengzhou 450015 China

In this study,hydrogels of P(NIPA-co-NVP)/clay were synthesized byγ-ray *** thermo-sensitive hydrogels were made under different experimental conditions such as dose,monomer ratio,and con- tent of clay.X-ray diffraction shows that the layer distance between Na-clays is changed from 1.6 to 2.7 nm because Na-clay pieces can be intercalated or exfoliated by HTMAB,and that between P(NIPA-co-NVP)/clay pieces is 3.4 nm. The swelling property tests show that the LCST of P(NIPA-co-NVP) is higher than *** the increase of NVP content,LCST is *** the ratio of NIPA/NVP is 95/5,hydrogel shows the best swelling property and LCST is 37℃.LCST of P(NIPA-co-NVP)/clay hydrogel is not changed,but the strength and swelling properties are better.

关键词：共聚物粘土水凝胶辐射聚合作用合成性质 NIPA NVP

Active thermophoresis and diffusiophoresis

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Chinese Physics B 2022年第10期31卷 444-449页

作者： Huan Liang Peng Liu Fangfu Ye mingcheng yang Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of Sciences(CAS)Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Songshan Lake Materials Laboratory Dongguan 523808China

Thermophoresis and diffusiophoresis respectively refer to the directed drift of suspended particles in solutions with external thermal and chemical gradients, which have been widely used in the manipulation of mesoscopic particles. We here study a phoretic-like motion of a passive colloidal particle immersed in inhomogeneous active baths, where the thermal and chemical gradients are replaced separately by activity and concentration gradients of the active particles. By performing simulations, we show that the passive colloidal particle experiences phoretic-like forces that originate from its interactions with the inhomogeneous active fluid, and thus drifts along the gradient field, leading to an accumulation. The results are similar to the traditional phoretic effects occurring in passive colloidal suspensions, implying that the concepts of thermophoresis and diffusiophoresis could be generalized into active baths.

关键词： active matter colloid thermophoresis diffusiophoresis

Edge Transport and Self-Assembly of Passive Objects in a Chiral Active Fluid

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Chinese Physics Letters 2021年第12期38卷 85-90页

作者： Qing yang Huan Liang Rui Liu Ke Chen Fangfu Ye mingcheng yang Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China

Topological edge flow and dissipationless odd viscosity are two remarkable features of chiral active fluids composed of active *** features can significantly influence the dynamics of suspended passive particles and the interactions between the *** computer simulations,we investigate the transport phenomenon of anisotropic passive objects and the self-assembly behavior of passive spherical particles in the active spinner *** is found that in confined systems,nonspherical passive objects can stably cling to boundary walls and are unidirectionally and robustly transported by edge flow of ***,in an unconfined system,passive spherical particles are able to form stable clusters that spontaneously and unidirectionally rotate as a *** these phenomena,strong particle-wall and interparticle effective attractions play a vital role,which originate from spinner-mediated depletion-like interactions and can be largely enhanced by odd viscosity of spinner *** results thus provide new insight into the robust transport of cargoes and the nonequilibrium self-assembly of passive intruders.

关键词： inner spherical viscosity

Diffusion of a chemically active colloidal particle in composite channels

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Chinese Physics B 2022年第4期31卷 436-440页

作者： Xin Lou Rui Liu Ke Chen Xin Zhou Rudolf Podgornik mingcheng yang School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China

Diffusion of colloidal particles in microchannels has been extensively investigated,where the channel wall is either a no-slip or a slip-passive ***,in the context of active fluids,driving boundary walls are ubiquitous and are expected to have a substantial effect on the particle *** mesoscale simulations,we study the diffusion of a chemically active colloidal particle in composite channels,which are constructed by alternately arranging the no-slip and diffusio-osmotic boundary *** this case,the chemical reaction catalyzed by the active colloidal particle creates a local chemical gradient along the channel wall,which drives a diffusio-osmotic flow parallel to the *** show that the diffusio-osmotic flow can significantly change the spatial distribution and diffusion dynamics of the colloidal particle in the composite *** modulating the surface properties of the channel wall,we can achieve different patterns of colloidal position *** findings thus propose a novel possibility to manipulate colloidal diffusion in microfluidics,and highlight the importance of driving boundary walls in dynamics of colloidal particles in microchannels.

关键词： diffusion composite channels diffusio-osmotic flow hydrodynamic effect

Radiation pre-vulcanization effect on properties of the truck tyre's transition layer and the truck tyre

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Nuclear Science and Techniques 2013年第2期24卷 31-35页

作者： yang mingcheng ZHANG Benshang ZHU Jun LI Zhaopeng LI Kunhao GUO Dongquan ZHANG Hongna Isotope Institute Co.Ltd. Henan Academy of Science School of Materials Science and Engineering Zhengzhou University Aeolus Tyre Co.Ltd.

In this paper,the natural rubber is chosen as the main constituents for the transition layer of all-steel load radial tyre,which is pre-vulcanized by 500-keV E-beam irradiation of up to 60 *** results show that the green strength of transitional layer increases with the dose,reaching four times as much as the control(without irradiation) at 60 *** final mechanical properties do not differ significantly from those of the control except that the aging and fatigue performance ***,thickness of the natural rubber transitional layer for an average single tyre can be reduced by 1 mm(or 1.5 kg) without obvious adverse effect on tyre performance.

关键词：抗疲劳性能过渡层卡车轮胎预硫化全钢载重子午线轮胎电子束照射辐射生坯强度

Swelling and thermal properties of porous PNIPAM/PEG hydrogels prepared by radiation polymerization

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Nuclear Science and Techniques 2013年第2期24卷 17-24页

作者： LI Zhihui LIU Wentao LI Zhongyuan yang mingcheng GAO Xujing CUI Haitao HE Suqin ZHU Chengshen School of Materials Science and Engineering Zhengzhou University Shenzhen Academy of Metrology & Quality Inspection Isotope Institute of Henan Academy of Sciences

In this study,a series of porous intelligent hydrogels were synthesized by radiation exhibiting the lower critical solution temperature（LCST） and fast response involving a combination of A’-isopropyl acrylamideas monomer, polyethylene glycol（PEG） as pore-forming agent and N,N-methylene-bis-acrylamide as crosslinking *** hydrogels were analyzed by Fourier transform infrared spectroscopy,and the influence of radiation doses on their swelling and thermal behaviors were *** surface morphologies were examined by scanning electron *** results showed that PEG molecules only acted as pore-forming agent in the cross-linked *** swelling ratios reduced with increasing radiation *** LCST was around 37℃,and varied little with the radiation *** frozen water content of PNIPAM/PEG6000 hydrogel reduced with increasing the radiation dose,and was greater than that of PN1PAM hydrogel at 15 *** macropores were prepared by PEG agent,and the hydrogels without PEG had a dense *** porous hydrogels are expected to be applied in the field of artificial intelligence material.

关键词：智能水凝胶 PNIPAM 辐射聚合 PEG 多孔肿胀制备热性能

A composite micromotor driven by self-thermophoresis and Brownian rectification

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Chinese Physics B 2021年第11期30卷 107-111页

作者： Xin Lou Nan Yu Ke Chen Xin Zhou Rudolf Podgornik mingcheng yang University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China Songshan Lake Materials Laboratory Dongguan 523808China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China

Brownian motors and self-phoretic microswimmers are two typical micromotors,for which thermal fluctuations play different *** motors utilize thermal noise to acquire unidirectional motion,while thermal fluctuations randomize the self-propulsion of self-phoretic *** we perform mesoscale simulations to study a composite micromotor composed of a self-thermophoretic Janus particle under a time-modulated external ratchet *** composite motor exhibits a unidirectional transport,whose direction can be reversed by tuning the modulation frequency of the external *** maximum transport capability is close to the superposition of the drift speed of the pure Brownian motor and the self-propelling speed of the pure self-thermophoretic ***,the hydrodynamic effect influences the orientation of the Janus particle in the ratched potential,hence also the performance of the composite *** work thus provides an enlightening attempt to actively exploit inevitable thermal fluctuations in the implementation of the self-phoretic microswimmers.

关键词： Brownian motors self-phoretic microswimmers thermal noise hydrodynamic effect