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Scalable exfoliation for few-layered hexagonal boron nitride nanosheets(BNNSs) by microwave-assisted expansion and liquid nitrogen intercalation

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Chinese Chemical Letters 2020年第7期31卷 1936-1940页

作者： Zhansheng Ma zan liu Zhilin Cheng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The low cost and facile scalable exfoliation route for two-dimensional hexagonal boron nitride(h-BN)was still indispensable for potential *** this work,we presented a convenient and scalable exfoliation for few-layer *** advantage of the advantages of swift heating of microwave and ultra low temperature vaporization of liquid nitrogen,bulk h-BN was high-efficiently exfoliated into fewlayer *** as-exfoliated BNNSs had a 2-6 nm thickness and approximately 7.91%yield,exhibiting scalable,facile and environment-friendly *** re,the as-exfoliated BNNSs we re applied as additive in oil for reducing friction of *** COF of the BNNSs-based grease reduced by 20.10% compared to grease,and the antiwear performance decreased by 55.8% and 45.1% relative to grease and h-BN-based grease.

关键词： BNNSs Exfoliation Microwave Liquid nitrogen Friction

Electrospinning Nanofiber Membrane Reinforced PVA Composite Hydrogel with Preferable Mechanical Performance for Oil-Water Separation

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 19-26页

作者： Gao Deyu liu zan Cheng Zhilin School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002

Nowadays hydrogels have been attracting the massive interest in oil-water separation due to their robust hydrophilicity and fantastic underwater oiliness ***,the weak toughness and tensile strength shortcomings of hydrogels have thus inhibited their actual *** this reason,we successfully fabricated the electrospun nanofiber membrane-reinforced PVA composite *** PVA-PAN composite hydrogel has exhibited the excellent tensile strength and friction performance,separately enhancing 174.2%of the tensile strength,and reducing 20.7%of the friction coefficient and 58.7%of wear volume relative to the neat PVA ***,the pull-out experiments indicated that the PAN nanofiber membrane exerted a stronger interface bonding effect with PVA *** oil-water separation evaluation test showed that the separation efficiency reached up to 97.6%for treating the SA-100 lubricating oil/water system.

关键词： wear and tribology nanoparticles PVA hydrogel electrospun fiber oil-water separation

A Simple and Highly-Efficient Approach for Construction of 2D Nanostructured H-BN/WS2 Heterojunction through Hydrothermal Method-Assisted Exfoliation and Their Friction Performance in Grease

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China Petroleum Processing & Petrochemical Technology 2020年第3期22卷 88-93页

作者： Ma Zhansheng liu zan Cheng Zhilin School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002

In this work,the 2D nanostructured h-BN/WS2 heterojunction was successfully prepared by the hydrothermal method-assisted exfoliation of bulk h-BN and *** morphology and structure of the as-prepared heterojunction were determined by a series of characterization *** mechanism for the formation of the as-prepared heterojunction was *** friction coefficient and wear rate of the as-prepared h-BN/WS2 heterojunction-grease was decreased by 33.9%and 45.9%,respectively,as compared to those of the neat grease.

关键词： heterojunction h-BN WS2 tribological property

Hydrothermal-assisted grinding route for WS_(2) quantum dots(QDs)from nanosheets with preferable tribological performance

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Chinese Chemical Letters 2021年第1期32卷 583-586页

作者： Zhi-Lin Cheng Lu Ma zan liu School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The 2 D nanomaterials have achieved the superlubrication property whatever in solid or liquid lubrication in recent ***,whether or not the nanosheets can stably disperse in oils and smoothly enter into the asperity of friction pairs is crucial for exerting the function of *** structure of 2 D QDs is desirable for addressing these issues due to its smaller 3 D *** this study,we developed a facile preparation process for WS_(2) QDs with uniform 2 nm size from nanosheets via hydrothermal-assisted grinding *** structure of the as-obtained WS_(2) QDs was determined by a series of *** results showed that the as-obtained WS_(2) QDs exhibited the typical spectrum features of nanosized quantum *** results of the tribological performance in grease verified that the average friction coefficient(ACOFs) and wear volume(AWVs) were decreased by 7.89% and 63.90%relative to grease,respectively,exhibiting a preferable friction reducing and wear resistance.

关键词： Nanosheets WS_(2) Quantum dots Tribological performance Grease

Low-Temperature Synthesis of Crystalline Inorganic/Metallic Nanocrystal-Halloysite Composite Nanotubes

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Chinese Journal of Chemistry 2014年第7期32卷 599-606页

作者： Cuiping Li Jiaqiang Wang Siquan Feng zan liu Department of Applied Chemistry Key Laboratory of Medicinal Chemistry for Natural ResourceMinistry of EducationSchool of Chemical Science and TechnologyYunnan UniversityKunmingYunnan 650091China Kunming Cable Co. LtdKunmingYunnan 650100China

We have demonstrated a facile approach for the low-temperature synthesis of crystalline inorganic/metallic nanocrystal-halloysite composite nanotubes by employing the bulk controlled synthesis of inorganic/metallic nanocrystals on halloysite *** halloysite clay nanotubes can adsorb the target precursor and induce inorganic/metallic nanocrystals to grow in *** crystalline phase and morphology of the composite clay nanotubes is *** simply tuning the acidity of the titania sol,the crystalline titania-clay nanotubes with tunable crystalline phases of anatase,a mixture of anatase and rutile or rutile are *** approach is general and has been extended to synthesize the representative perovskite oxide(barium and strontium titanate)-halloysite composite *** nickel nanocrystal can also be grown on the surface of halloysite nanotubes at low *** traditional thermal treatment for crystallite transformation is not required,thus intact contour of halloysite nanotubes and the crystallinity structure of halloysite nanotubes can be *** combined properties from inorganic/metallic nanocrystal(high refractive index,high dielectric constant and catalytic ability)and the halloysite clay nanotubes are promising for applications such as photonic crystals,high-k-gate dielectrics,photocatalysis and purification.

关键词： composite nanotubes halloysite inorganic nanocrystal perovskite oxide low temperature synthesis

BRANCHING GENERATION DURING THE FREE RADICAL COPOLYMERIZATION OF p-VINYL BENZENE SULFONYL CHLORIDE WITH STYRENE

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Chinese Journal of Polymer Science 2013年第10期31卷 1404-1414页

作者： Cui-ping Li Rong Huang Jia-qiang Wang zan liu Department of Applied Chemistry Key Laboratory of Medicinal Chemistry for Natural Resource College of Chemistry Science and Engineering Yunnan University Kunming Cable Co. Ltd

The branching generation during the free radical copolymerization of chain transfer monomer p-vinyl benzene sulfonyl chloride （VBSC） with styrene was investigated by a simple mathematic model. Chain transfer constant of VBSC was determined to be around 0.3 by fitting the 1H-NMR monitored experimental results with a mathematic model. According to the theoretical analysis, the obtained poIy（VBSC） and its copolymers were substantiated to have a grafting-like main chain with residual pendent sulfonyl chloride groups after consuming most of the vinyl groups. The copolymerization results of VBSC with styrene at varied feed ratios demonstrated that conversion of sulfonyl chloride groups was lower than that of the monomer, which was in agreement with the theoretical results. The glass transition temperature, number average molecular weight and distribution of those obtained polymers were primarily investigated. Comparing with other chain transfer monomers, VBSC has a chain transfer constant much closer to unity therefore a more branched polymer is expected. Additionally, the branched polystyrene with residual sulfonyl chloride groups is hopefully to be further used as ATRP macro- initiators or reactive intermediates to synthesize functional polymers with complex structure.

关键词： Branched polystyrene Chain transfer constant Chain transfer monomer p-Vinyl benzene sulfonyl chloride Radical polymerization.

Graphene-intercalated HNTs for Reinforcing PTFE

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China Petroleum Processing & Petrochemical Technology 2020年第1期22卷 17-23页

作者： liu zan Cao Baochong Cheng Zhilin School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002

The preparation of graphene(GN)and graphene-intercalated halloysite nanotubes(HNTs)to form nanomaterials was achieved by using HNTs *** a promising application,a series of the polytetrafluoroethylene(PTFE)nanocomposite filled with GN and GN/HNTs at different mass fractions were *** mechanical and friction properties of PTFE nanocomposites depending on the mass fraction of graphene-intercalated HNTs(GN/HNTs)were intensively *** comparison between the effects of GN and GN/HNTs serving as fillers on properties of PTFE was *** results showed that in terms of enhancing the tensile strength of PTFE,the enhancement effect of GN is superior to GN/HNTs,and in terms of the elongation at break,the GN/HNTs filler could reserve more toughness than *** Young’s modulus of the GN/HNTs incorporated into PTFE is about 1.9 times larger than pure PTFE,and is superior to GN/*** friction coefficient of PTFE nanocomposites filled with GN and GN/HNTs was slightly higher than pure PTFE and the latter was lower than the *** volume wear rate of PTFE nanocomposites filled with GN/HNTs was obviously lower than the case with GN,which exhibited the better wear resistance of GN/HNTs used as filler.

关键词： halloysite nanotubes graphene polytetrafluoroethylene mechanical properties friction

Preparation and Mechanical Properties of PAN/HNTs Composite Nanofibers

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China Petroleum Processing & Petrochemical Technology 2017年第1期19卷 92-98页

作者： liu zan Qin Xixi Qin Dunzhong Cheng Zhilin School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 Jiangsu Sinvochem Company Yangzhou 225002

The enhanced composite nanofibers have attracted great attention for application in recent years. The electrospinning technique was considered to be a prospective production pattern for them. This paper provided a promising technique to prepare the polyacrylonitrile （PAN）/halloysite nanotube （HNT） composite nanofbers by using the electrospinning method. The PAN/HNTs composite nanofbers with well enhanced performance were successfully fabricated from a mixture of PAN/DMF/HNTs dispersion solution processed by the electrospinning technique. For achieving good dispersion in PAN polymer, the highly dispersed HNTs were obtained by using polycarboxylate modifcation employing the in-situ spray-drying method. The structure and properties of the composite nanofbers were characterized by TEM, XRD, EDX, IR, and DSC techniques. The obtained PAN/HNTs composite nanofbers with different HNTs contents were about 300-500 nm in diameter. In addition, the mechanical properties of PAN/HNTs composite nanofbers were tested, which exhibited an excellently enhanced performance.

关键词： PAN HNTs composite nanofber electrospinning

A Study on Tribological Properties of Polypropylene Nanocomposites Reinforced with Pretreated HNTs

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China Petroleum Processing & Petrochemical Technology 2017年第3期19卷 115-122页

作者： liu zan Li Yanxiang Ma Lu Qin Dunzhong Cheng Zhilin School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002 Jiangsu Sinvochem Company Yangzhou 225002 Zhejiang High Technology Research Institute Yangzhou 225002

The polypropylene(PP) nanocomposites filled with pretreated halloysite nanotubes(HNTs) were prepared by the melt-blending method. Before filling, the as-received HNTs powder was at first purified and then modified. The characterization tests showed that the purified HNTs had less impurity and more uniform pore size distribution and the surface hydrophobicity of the modified HNTs was obviously improved. The mechanical and tribological properties of the PP/HNTs nanocomposites were extensively investigated. The results showed that the tensile, bending and notched impact strength of the PP/HNTs nanocomposites was somewhat improved, but the wear resistance of the PP/HNTs nanocomposites was obviously enhanced.

关键词： PP HNTs nanocomposites mechanical properties tribological properties