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Rational Fabrication of Size Tunable SnO2 hollow microspheres

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Chemical Research in Chinese Universities 2015年第5期31卷 719-723页

作者： HUANG Zhiqiang GUO Jia WANG Xiaoling GAO Haiyan YU Jianguo ZHAO Yongnan LI Guodong Institute of Nanostructured Materials & Tianjin Key Laboratory of Fiber Modification and Functional Fiber School of Materials Science and Engineering Tianjin Polytechnic University Tianjin 300387 P. R. China Respiratory Department Jilin Province People's Hospital Changchun 130021 P. R. China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changehun 130012 P. R. China

A designed solution route was developed to fabricate size tunable SnO2 hollow microspheres based on the sol-gel theory. The hydrolysis of SnSO4 released protons to form SnO2 particulates and induced the decrease of pH value. To minimize the high surface energy, the SnO2 particulates tended to assemble into large particles, the size of which was affected by the electrolyte concentration or pH value. Elevating SnSO4 content aroused the decrease of the pH value that directed to the shrinkage of the aggregated particle size of SnO2. Size tunable SnO2 hollow micro- spheres were then rationally fabricated under solvothermal conditions via Ostwald ripening by simply adjusting the SnSO4 concentration. The in situ pH decrease directed to the shrinkage of the particle size from 270 nm to 112 nm. The formation mechanism was confirmed and rationally elucidated by the time dependant morphology evolution. Charge-discharge tests revealed that the reduced particle size aroused an improved lithium ion battery performance.

关键词： hollow microsphere Solvothermal synthesis Nanocrystalline material Tin oxide

Denatured proteins show new vitality:Green synthesis of germanium oxide hollow microspheres with versatile functions by denaturing proteins around bubbles

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Aggregate 2023年第1期4卷 238-249页

作者： Yanfang Zhao Xin Liang Daoyuan Chen Xuhui Bian Wanjian Liu Lei Han College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural UniversityQingdaoShandongChina Qingdao Shuojing Biological Technology Co. Ltd.QingdaoShandongChina

The hollow structure has long attracted great attention because of its excellent ***,this special structure is usually synthesized through some complex ***,we discovered that denatured bovine serum albumin(BSA)can trigger unusual biomineralization for the simple,green and shape-controllable synthesis of germanium oxide(GeOx)hollow microsphere(HMS).At high temperature(60℃),BSA was denatured,and a compact BSA layer was formed around the H2 *** denatured BSA layer was stable and suitable for anchoring and growing *** simply changing the BSA concentration and temperature,various morphologies of GeOx could be *** to the denatured protein skeletons and microenvironment-regulated collapse,GeOx HMS showed great potential for intelligently responsive pesticide delivery in the insect gut,showing superiority over traditional delivery systems,which early release pesticides in the mouth and *** by its large specific surface area,excellent biocompatibility,modifiable functional groups,and high electrocatalytic activity,GeOx HMS was also applied to versatile sensors for H_(2)O_(2) assays at physiological pH and rapid coronavirus COVID-19 *** work not only provides some evidence for understanding proteins in depth but also paves a new avenue for the biomineralization-inspired synthesis of hollow structures with versatile functions.

关键词： biomineralization COVID-19 denatured protein electrochemical sensor hollow microsphere intelligent pesticide delivery

Fabrication of TiO_2 hollow microspheres using K_3PW_(12)O_(40) as template

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Chinese Journal of Catalysis 2015年第12期36卷 2237-2243页

作者：蓝俊峰伍晓锋吕康乐司玲玲邓克俭广西科技师范学院化学与生命科学系广西柳州545004 中南民族大学催化材料科学国家民委-教育部共建重点实验室湖北武汉430074

Fabrication of TiO 2 hollow microspheres（TiO 2-HMSs） has attracted considerable attention owing to their low density,high photoreactivity,and easy to separate and reuse. A fluoride-free method for the fabrication of TiO 2-HMSs is reported by refluxing a mixed solution of H3PW12O40（0.4 mmol）,KCl（2.5 mmol） and Ti（SO4）2（2–25 mmol） at 125 °C for 8 h,followed by decomposition of the K3PW12O40（KPW） template in basic solution. The prepared TiO 2-HMSs are characterized by X-ray diffraction,transmission electron microscopy,scanning electron microscopy,Fourier transform infrared spectroscopy,ultraviolet-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The activities of the photocatalysts are evaluated by photocatalytic degradation of Brilliant Red X-3B,an anionic dye,under UV irradiation. It is observed that the TiO 2-HMSs exhibit diameters of approximately 0.5–1 μm,and the photocatalytic activity of TiO 2-HMSs initially increases and then decreases with an increasing amount of Ti（SO4）2. The TiO 2-HMSs prepared in the presence of 4 mmol Ti（SO4）2 exhibit the highest photocatalytic activity,which is 2.1 times higher than TiO 2 nanoparticles（prepared in the absence of the KPW template）. The enhanced photocatalytic activity of the prepared TiO 2-HMSs is ascribed to the improved crystallization,coupling effect between TiO 2and the residual KPW template,and the unique hollow structures of TiO 2-HMSs.

关键词： Titania hollow microsphere K3PW12O40 Template Degradation

2D nanoplate assembled nitrogen doped hollow carbon sphere decorated with Fe3O4 as an efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries

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Nano Research 2019年第11期12卷 2774-2780页

作者： Yanqiang Li Huiyong Huang Siru Chen Xin Yu Chao Wang Tingli Ma State Key Laboratory of Fine Chemicals School of Ptroleumn and Chemical Eninering Dalian Univrsity of Tehnologos Panjin CampusPanjin 124221China Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology 2-4 HibikinoWakamatsuKitakyushuFukuoka 808-0196Japan Center for Advanced Materials Research Zhongyuan University of TechnologyZhengzhou 450007China

Designing a highly efficient non-precious based oxygen reduction reaction(ORR)electrocatalyst is critical for the commercialization of various sustainable energy storage and conversion devices such as metal-air batteries and fuel ***,we report a convenient strategy to synthesis Fe3O4 embedded in N doped hollow carbon sphere(NHCS)for ***'s interesting is that the carbon microsphere is composed of two-dimensional(2D)nanoplate that could provide more exposed active *** usage of solid ZnO nanowires as zinc source is crucial to obtain this *** Fe3O4@NHCS-2 exhibits better catalytic activity and durability than the commercial PtC ***,it further displays high-performance of Zn-air batteries as a cathode electrocatalyst with a high-power density of 133 mW·cm^-2 and high specific capacity of 701 mA·h·g^-*** special hollow structure composed 2D nanoplate,high surface area,as well as synergistic effect between the high active Fe3O4 nanoparticles and N-doped matrix endows this outstanding catalytic *** work presented here can be easily extended to prepare metal compounds decorated carbon nanomaterials with special structure for a broad range of energy storage and conversion devices.

关键词： oxygen reduction reaction Zn-air battery Fe3O4 N doping hollow microsphere

Sonochemical Method for the Preparation of hollow SnO2 microspheres

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Chinese Journal of Chemistry 2006年第7期24卷 983-985页

作者：张霞赵彦保陶小军吴志申张平余张治军 Laboratory of Special Functional Materials Henan University Kaifeng 475001 China

A simple sonochemical route has been successfully developed to synthesize SnO2 hollow microspheres. The obtained sample is characterized by XRD, TEM, XPS and UV-visible spectrophotometer. The TEM image of the sample at high magnification shows that the shell of the hollow sphere is composed of 3-5 nm SnO2 nanoparticles. A possible formation mechanism of the hollow spheres is briefly discussed.

关键词： SnO2 sonochemical method hollow microsphere

Influence of Surfactant-polymer Complexes on Crystallization and Aggregation of CaCO_3

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Chemical Research in Chinese Universities 2012年第4期28卷 737-742页

作者： PAN Yan GUO Yu-peng ZHAO Xu WANG Zi-chen College of Chemistry Jilin UniversityChangchun 130021P.R.China College of Chemistry Changehun Normal UniversityChangchun 130032P.R.China

hollow calcium carbonate（CaCO3） microspheres with different morphologies were synthesized via the precipitation reaction of calcium chloride with sodium carbonate in the presence of different surfactant-polymer *** selected anionic surfactants were sodium dodecyl sulfonate（SDS） and sodium dodecyl benzenesulfonate（SDBS）,*** selected water-soluble polymers were polyacrylic acid（PAA） and polyvinyl pyrrolidone（PVP）.In this work,SDS-PVP ＂pearl-necklace model＂ micellar complex was formed via hydrophobic effectiveness between SDS and PVP and it served as the spherical template to generate spherical CaCO3 aggregates with hollow microspheres composed of about 500 nm irregular shaped ***-PAA complexes and SDBS-PAA complexes formed ＂core-shell model＂ aggregates with calcium ions serving as the medium to link the anionic surfactant and the ***-PAA ＂core-shell model＂ aggregates would act as templates for hollow CaCO3 microspheres consisting of 30―50nm irregular shaped ***-PAA ＂core-shell model＂ aggregates served as the spherical aggregate templates to generate spherical CaCO3 aggregates consisted of many small spherical particles which had grown *** the obtained CaCO3 hollow microspheres are calcite *** research may provide new insight into the control of morphologies of hollow CaCO3 microspheres in the presence of surfactantpolymer complexes.

关键词： Surfactant-polymer complex Calcium carbonate hollow microsphere