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Journal of Rare Earths 2023年第5期41卷 639-648,I0001页

作者： Haitao Lv Yanmin Wang zhidong pan Xiangyu Li Yehong Zhang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China School of Materials Science and Engineering Guizhou Minzu UniversityGuiyang 550025China

Eu^(2+),Dy^(3+)and Zr_(4+)ions co-doped strontium aluminate(i.e.,SrAl_(2)O_(4):Eu^(2+),Dy^(3+),Zr_(4+))/molybdate(i.e.,Ho2MoO6or Nd2MoO6)with photo-/mechano-luminescence and allochroic effect as multi-optical functional hybrid pigments were prepared via solid state reactions and subsequent mixing.The phosphor and hybrid pigments were characterized by X-ray diffraction,scanning electron microscopy with energy dispersive X-ray spectroscopy,ultraviolet-visible spectroscopy,L*a*b*color scale analysis,spectrophotometry and mechanoluminescent measurement.The results show that the optimum luminescent emission intensity of SrAl_(2)O_(4):Eu^(2+),Dy^(3+),Zr_(4+)phosphor can be obtained when 5 mol%Zr_(4+)ions is doped into the lattice.Under the excitation of 365 nm wavelength,the hybrid pigments prepared with the phosphor and molybdate at a mass ratio of 1:1 present a green broad band emission located at 460-650 nm due to 4f65d1→4f7transitions of Eu^(2+)ions.The hybrid pigments have the superior mechanoluminescent property and emit light after being exerted by mechanical stresses.Besides,the hybrid pigments also exhibit an allochroic effect under different illuminants.In addition,the anti-counterfeiting of the hybrid pigments as a promising application was also presented.

关键词： Eu^(2+),Dy^(3+),Zr^(4+)-co-doped strontium aluminate Molybdate Hybrid pigment Mechanoluminescence Allochroiceffect Rareearths

Inversion of particle size distribution from light-scattering data using a modified regularization algorithm

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Particuology 2010年第4期8卷 365-371页

作者： Yanmin Wang Guobiao Liang zhidong pan College of Materials Science Engineering South China University of Technology Guangzhou 510640 China Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology Ministry of Education South China University of Technology Guangzhou 510640 China

A modified regularization algorithm with a more proper operator was proposed for the inversion of particle size distribution （PSD） from light-scattering data in a laser particle sizer based on the Mie scattering principle. The Generalized Cross-Validation （GCV） method and the L-curve method were used for deter- mining the regularization parameter. The Successive Over-Relaxation （SOR） iterative method was used to increase the exactness and stability of the converged result. The simulated results based on the modified algorithm are in a good agreement with the experimental data measured for nine standard particulate samples, their mixtures as well as three natural particulate materials with irregular shapes, indicating that this modified regularization method is not only feasible but also effective for the simulation of PSD from corresponding light-scattering data.

关键词： Particle size measurement Mie scattering Laser particle size analyzerInverse algorithm

Synthesis and characterization of (Ni,Sb)-co-doped rutile ceramic pigment via mechanical activation-assisted solid-state reaction

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Particuology 2018年第6期16卷 20-29页

作者： Shi Zhang zhidong pan Yanmin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

(Ni,Sb)-co-doped rutile yellow ceramic pigments were synthesized via a mechanical activation-assisted solid-state reaction in a stirred bead mill.The effects of mechanical grinding of the raw materials on the synthesis of (Ni,Sb)-co-doped rutile pigment were investigated.The results show that mechanical activation effectively decreased the crystallinity of the mixed precursors,thus enhancing their reactivity and the migration rate of ions.These effects lowered the temperature required for formation of the rutile phase.Compared with results from a mixture of separately ground precursors,the mixture of raw materials ground together was more effective for accelerating nickel/antimony ions doping into the TiO2structure and improved the color performance of the pigment.The pigment from the mixed raw materials ground for 2.0h and heat-treated at 1100℃ could be used as an environmentally-friendly ceramic yellow pigment owing to its low-toxicity,bright yellow hue,good chemical/thermal durability, and high cost-effectiveness.

关键词： Mechanical activation Solid-state synthesis (Ni,Sb)-co-doped rutile Ceramic pigment

Effect of alkalis on deacetylation of konjac glucomannan in mechano-chemical treatment

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Particuology 2011年第3期9卷 265-269页

作者： zhidong pan Junjie Meng Yanmin Wang School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology Ministry of Education South China University of Technology. Guangzhou 510640 China

This paper presents experimental results on the effect of alkalis such as NaOH, KOH and Ca（OH）2 on deacetylation of a konjac glucomannan （KGM） powder under mechano-chemical （MC） treatment, The results show that the alkalinity of modifiers is a dominant factor for deacetylation of KGM, In addition, characteristics, such as swelling property, viscous stability and thermal behavior of the deacetylated KGM are analyzed

关键词： Deacetylation Alkali Mechano-chemistry Konjac glucomannan

Tribological and tribochemical properties of magnetite nanoflakes as additives in oil lubricants

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Particuology 2014年第6期12卷 136-144页

作者： Longhua Xiang Chuanping Gao Yanmin Wang zhidong pan Dawei Hu College of Materials Science and Engineering South China University of Technology Key Laboratory of Specially Functional Material under Ministry of Education

This detailed the tribological and tribochemical properties of magnetite（Fe3O4） nanoflakes used as additives in #40 base oil in a four-ball tribo-tester.The average friction coefficient of the friction pair for lubricant containing the Fe3O4 nanoflakes of 1.5 wt%as a lubricant additive in the base oil is decreased by18.06%compared to that of solely base oil.The chemical composition of base oil with the Fe3O4 nanoflake additives did not change during the 48-h friction assessment.The decreased saturation magnetization and increased coercivity of magnetite nanoflakes occurred due to the distortion of the basal planes and the presence of hematite（α-Fe3O4） generated by the tribochemical reactions during the friction process.The multi-layer low-shear-stress tribochemical lubrication films on the surface of the friction pair could form because the nanoflake particles arrange and adhere onto the surface of the friction pair in an orderly manner,and the tribochemical reactions of the friction pair in the presence of the nanoflakes occur as Fe→FeO→Fe3O4→γ-FeOOH →γ-Fe2O3→α-Fe2O3.The formation of the films can improve the tribological properties.

关键词： Nanoflake particles Magnetite Lubricant additive Tribology Tribochemical properties

Low temperature hydrothermal synthesis of SrTiO3 nanoparticles without alkali and their effective photocatalytic activity

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Journal of Advanced Ceramics 2016年第4期5卷 298-307页

作者： Hongfang SHEN Youjun LU Yanmin WANG zhidong pan Guozhong CAO Xianghui YAN Guoli FANG School of Materials Science and Engineering South China University of Technology Guangzhou 510640 ChinaSchool of Materials Science and Engineering Beifang University of Nationalities Yinchuan 750021 China School of Materials Science and Engineering Beifang University of Nationalities Yinchuan 750021 China School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA

SrTiO3 nanoparticle (NP) photocatalyst was synthesized with a facile and environmentalfriendly hydrothermal method using tetrabutyltitanate, strontium oxide, and ethanolamine as precursors at low temperature without alkali as mineralizer for the first time. The SrTiO3 nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and N2 Brunauer–Emmett–Teller (BET) method. The SrTiO3 catalyst synthesized at 120 °C (STO-120) exhibited the highest photocurrent intensity among the samples synthesized at different hydrothermal temperatures. The high photocatalytic performance of STO-120 was mainly attributed to the more homogeneous and minimum nanoparticle size, the highest surface area, and the maximum light absorption property among the four different samples. This work presented an applicable and facile method to fabricate a highly active and stable SrTiO3 photocatalyst for organic pollutant degradation.

关键词： polyhedral SrTiO 3 hydrothermal synthesis low temperature photocurrent property photocatalytic activity stability

Taming heat with tiny pressure

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The Innovation 2024年第2期5卷 70-78页

作者： Kun Zhang Zhe Zhang Hailong pan Haoyu Wang Xueting Zhao Ji Qi Zhao Zhang Ruiqi Song Chenyang Yu Biaohong Huang Xujing Li Huaican Chen Wen Yin Changlong Tan Weijin Hu Michael Wüubbenhorst Jiangshui Luo Dehong Yu zhidong Zhang Bing Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Laboratory for Soft Matter and Biophysics Department of Physics and AstronomyKU Leuven3001 LeuvenBelgium Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150080China Australian Nuclear Science and Technology Organisation Lucas HeightsNSW 2234Australia

Heat is almost everywhere.Unlike electricity,which can be easily manipulated,the current ability to control heat is still highly limited owing to spontaneous thermal dissipation imposed by the second law of thermodynamics.Optical illumination and pressure have been used to switch endothermic/exothermic responses of materials via phase transitions;however,these strategies are less cost-effective and unscalable.Here,we spectroscopically demonstrate the glassy crystal state of 2-amino-2-methyl-1,3-propanediol(AMP)to realize an affordable,easily manageable approach for thermal energy recycling.The supercooled state of AMP is so sensitive to pressure that even several megapascals can induce crystallization to the ordered crystal,resulting in a substantial temperature increase of 48 K within 20 s.Furthermore,we demonstrate a proof-of-concept device capable of programable heating with an extremely high work-to-heat conversion effi-ciency of383.Such delicate and efficient tuning of heat may remarkably facilitate rational utilization of waste heat.

关键词： illumination thermal rational

金红石型钛镍黄/硅气凝胶复合色料的制备及其隔热性能

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硅酸盐学报 2023年第12期51卷 3177-3188页

作者：肖珺颖潘志东陆有军王燕民华南理工大学材料科学与工程学院广州510640 北方民族大学材料科学与工程学院银川750021

采用固相法合成了高近红外(NIR)反射金红石型钛镍黄色料,并以SiO_(2)气凝胶为基体,制备一种网络状NIR反射金红石型钛镍黄/硅气凝胶复合色料,测定了其结构特征和呈色性能,并分析其NIR反射效应和隔热性能。结果表明,添加1%(质量分数)助烧... 详细信息

采用固相法合成了高近红外(NIR)反射金红石型钛镍黄色料,并以SiO_(2)气凝胶为基体,制备一种网络状NIR反射金红石型钛镍黄/硅气凝胶复合色料,测定了其结构特征和呈色性能,并分析其NIR反射效应和隔热性能。结果表明,添加1%(质量分数)助烧剂NaF所固相合成的金红石型钛镍黄色料呈色性能(b*=54.24)和NIR反射性能优异;所制备的网络状金红石型钛镍黄/硅气凝胶复合色料具有良好呈色性能、低透过率、高NIR反射率(96.60%)和低导热系数[0.068 54 W/(m·K)],表明其具有优异的隔热性能。此外,还探讨了该复合色料的制备机制和隔热机理。

关键词：色料近红外反射气凝胶隔热

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探讨数字技术在路桥设计中的应用

科技资讯 2022年第10期20卷 22-24页

作者：潘志东中恩工程技术有限公司广东广州510000

为完善路桥工程设计效果,更好地指导现场施工过程,该文做出了在设计工作中应用数字技术的提议。首先对数字化设计做出简单介绍,其次探究路桥设计中数字技术的应用现状,剖析该项技术应用的意义,最后较为详细地探究数字技术在路桥设计信... 详细信息

为完善路桥工程设计效果,更好地指导现场施工过程,该文做出了在设计工作中应用数字技术的提议。首先对数字化设计做出简单介绍,其次探究路桥设计中数字技术的应用现状,剖析该项技术应用的意义,最后较为详细地探究数字技术在路桥设计信息采集、建模、导出与保存图纸、计算与统计工程量、协同化设计等方面的应用情况。希望能和同行分享经验,共同推广数字化技术。

关键词：路桥设计数字技术软件应用协同设计

稀土钼酸盐的光环境诱导变色效应及色度学分析

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硅酸盐学报 2023年第6期51卷 1541-1547页

作者：张晶萃潘志东张业鸿陆有军王燕民华南理工大学材料科学与工程学院广州510640 广州华星光电半导体显示技术有限公司广州510555 北方民族大学材料科学与工程学院银川750021

稀土钼酸盐材料的光环境诱导变色性能与其自身吸收反射特性与光源功率分布相关。基于色度学原理,对比国际照明委员会规定的4种标准光源(即D65、A、F2与F11光源)的功率分布曲线,构建了不同光源间的差异函数,并分析可知此类材料一般在功... 详细信息

稀土钼酸盐材料的光环境诱导变色性能与其自身吸收反射特性与光源功率分布相关。基于色度学原理,对比国际照明委员会规定的4种标准光源(即D65、A、F2与F11光源)的功率分布曲线,构建了不同光源间的差异函数,并分析可知此类材料一般在功率分布差异显著的光源间会呈现明显色差,当此类材料的反射率极小值位于光源差异函数的尖锐峰附近时,在相应光源间呈现较大色差,反之则色差较小。根据稀土离子的特征吸收谱线,筛选出具有光环境诱导变色效应的稀土元素,并实验验证了高温固相法所合成稀土钼酸盐变色材料。

关键词：光环境诱导变色效应钼酸盐稀土材料色度学分析