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Extraction Difficulty of Lithium Ions from Various Crystal Planes of Lithium Titanate

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Journal of Wuhan University of Technology(Materials Science) 2018年第5期33卷 1086-1091页

作者： ZHANG IAyuan zhou jiabei HE Gang zhou Dali TANG Dahai WANG Fahou College of Chemistry and Chemical Engineering Neijiang Normal UniversityNeijiang 641000China College of Materials Science and Engineering Sichuan UniversityChengdu 610064China College of Computer Science and Technology Southwest University of Science and TechnologyMianyang 621010China Computational Physics Key Laboratory of Sichuan Province Yibin UniversityYibin 644000China

To study the extraction difficulty of lithium ions from various crystal planes of Li2 TiO3, according to the first principle, four representative crystal surfaces of Li2TiO3（precursor）,（-133）,（-206）,（002） and（-131）, were selected to establish a model and to calculate the surface energy, bond length and population using Materials Studio 5.5（MS 5.5）. The results demonstrate that there is no direct relationship between the surface energy and the order of disappearance of the four diffraction peaks when lithium titanate is treated with hydrochloric acid, instead, the difficulty of Li~＋ extraction from various crystal faces corresponds to the Li-O bond strength. Lithium ion is easy to remove from（-133） and（-206） due to the relatively weak Li-O bond strength. In contrast, Li＋ extraction requires a longer time for（002） and（-131）.

关键词： lithium titanate crystal face surface energy bond length bond population

Immobilization of RGD Peptide onto the Surface of Apatite-Wollastonite Ceramic for Enhanced Osteoblast Adhesion and Bone Regeneration

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Journal of Wuhan University of Technology(Materials Science) 2014年第3期29卷 626-634页

作者：张翔 GU Jianwen ZHANG Yue TAN Yanfei zhou jiabei 周大利 College of Materials Science and Engineering Sichuan University The Military General Hospital of Chengdu PLA The First Affiliated Hospital of Gannan Medical University

The arginine-glycine-aspartic （RGD） acid peptide was grafted to the surface of apatitewollastonite （AW） ceramic in an effort to improve its cell adhesion, proliferation and osteoinduction. RGD peptide was covalently immobilized onto the surface of AW ceramic via the synthetic cross linker ***-E and 1-ethyl-3-（3-dimethylaminopropyl）carbodiimide （EDC）. The modified surfaces were characterized by attenuated total reflectance Fourier transform infrared spectroscopy （ATR-FTIR） and X-ray photoelectron spectroscopy （XPS）. The chemical analysis indicated that RGD peptide had been immobilized onto the AW surface successfully. The growth of osteoblast-like cells （MG63） showed that modifying the AW surface with RGD peptide enhanced the cell adhesion and proliferation. And the histological evaluation of RGD-AW showed that the bone regeneration and remodeling process were significantly enhanced compared to the original AW ceramics after 2, 4 and 8 weeks implantation in rabbit＇s femoral condyles.

关键词： apatite-wollastonite ceramic surface modification RGD peptide osteoinduction boneregeneration

Preparation of Ceramic Foams Suitable for Aircraft Arresting by the Airport Runway Based on a Protein Foaming Agent

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 980-989页

作者：张理元周大利 YANG Weizhong CHEN Ying LIANG Bin zhou jiabei College of Materials Science and Engineering Sichuan University

Crushable ceramic foams are more suitable to be used as an arrestor material applied in engineered materials arresting system （EMAS） for airport runway for their properties of widely controllable strength, negligible crushing-rebounding behavior, durability, and chemically-inert composition, comparing with traditional concrete foams. The synthesis of ceramic foams adopted direct-foaming method and used an animal protein as foaming agent. Kaolin, talc powder and alumina were the main raw materials. Effects of the ratios of raw materials, calcination temperatures, heating rates, holding time, viscosities of potyvinyl alcohol （PVA） solution as well as the amounts of protein foaming agent and water on microscopic structure, densities, compressive strength and open porosities of ceramic foams were investigated systematically. The results indicate that ceramic foams with typical pore sizes 100-300 μm, open porosities from 73.1% to 91.5%, densities from 0.25 to 0.62 ***-3, compressive strength from 0.19 to 4.89 MPa, are obtained by properly adjusting the parameters mentioned above. And the mechanical strength meets the requirement for the EMAS for airport runway. In addition, good correlations are observed among compressive strength, open porosity, microscopic structure, and crystal phase. Furthermore, the possibility of producing the general dimensions of such aircraft arresting components with the proposed method was also discussed.

关键词： cattle hoof shell direct foaming ceramic foams freeze drying crushable arrestor material

接枝RGD多肽磷灰石-硅灰石材料的矿化和生物学特性

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复合材料学报 2017年第12期34卷 2785-2793页

作者：张翔张文书周加贝龙沁周大利赣南医学院赣州341000 四川大学化学工程学院成都610065 四川大学材料科学与工程学院成都610065

应用等离子辅助化学接枝方法在磷灰石-硅灰石(AW)生物活性玻璃的表面接枝精氨酸-甘氨酸-天冬氨酸(RGD)多肽。采用模拟体液(SBF)浸泡方法研究了AW表面接枝RGD基团对材料体外矿化特性的影响。SEM和EDS检测结果表明,RGD多肽的引入有利于羟... 详细信息

应用等离子辅助化学接枝方法在磷灰石-硅灰石(AW)生物活性玻璃的表面接枝精氨酸-甘氨酸-天冬氨酸(RGD)多肽。采用模拟体液(SBF)浸泡方法研究了AW表面接枝RGD基团对材料体外矿化特性的影响。SEM和EDS检测结果表明,RGD多肽的引入有利于羟基磷灰石(HA)的沉积,能够增强RGD-AW复合材料的体外矿化能力,HA形貌为蠕虫状。材料MG-63细胞共培养实验以及材料新西兰成年大白兔体内植入实验的结果表明,表面化学接枝RGD多肽的RGD-AW复合材料能够显著地促进类成骨细胞的黏附和铺展,并且在2周、4周和8周时均能够加速新骨的生成及骨组织结构和功能的重建。

关键词：磷灰石-硅灰石生物活性玻璃精氨酸-甘氨酸-天冬氨酸(RGD)多肽体外矿化骨修复

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疏水聚合法制备重晶石/钛白粉复合颜料研究

矿产综合利用 2021年第6期42卷 66-72页

作者：胡兴航周大利刘灿周加贝四川大学材料科学与工程学院四川成都610041 四川大学化学工程学院四川成都610041

为提高重晶石的附加值,以重晶石微粉和金红石型钛白粉为原料,油酸钠为改性剂,采用疏水聚合法制备重晶石/钛白粉复合颜料粉。分别对重晶石微粉和金红石型钛白粉先进行油酸钠湿法改性,再将两种改性粉体浆料混合搅拌、过滤、干燥和研磨分散... 详细信息

为提高重晶石的附加值,以重晶石微粉和金红石型钛白粉为原料,油酸钠为改性剂,采用疏水聚合法制备重晶石/钛白粉复合颜料粉。分别对重晶石微粉和金红石型钛白粉先进行油酸钠湿法改性,再将两种改性粉体浆料混合搅拌、过滤、干燥和研磨分散,得复合颜料粉。结果表明:在液固比为5:1,搅拌转速300 r/min,改性温度60℃;油酸钠添加量为重晶石质量的0.5%,改性时间45 min;油酸钠添加量为钛白粉质量的3.0%,改性时间30 min的条件下,当钛白粉质量分数为60%时,重晶石/钛白粉复合颜料的蓝光白度Wr达到91.46%,吸油值为10.94 g/100 g,遮盖力为15.90 g/m^(2),达到所用纯金红石型钛白粉遮盖力性能的86%,表现出良好的亲油性,可作为颜料使用。

关键词：重晶石钛白粉油酸钠复合颜料疏水聚合

钙碳比对CaSO_4-CaCO_3-(NH_4)_2CO_3-H_2O体系反应-结晶过程的影响

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化工学报 2018年第6期69卷 2533-2539页

作者：宫源周加贝朱家骅罗安安薛潇田建四川大学化学工程学院四川成都610065

在CaSO_4-CaCO_3-(NH_4)_2CO_3-H_2O反应体系中,生成碳酸钙与硫酸铵的控速步骤是石膏溶解。溶解表面被新生的碳酸钙结晶覆盖是重要影响因素。基于反应面模型,通过调整钙离子溶出速率与碳酸根加入速率之比(钙碳比),将反应-结晶面控制在... 详细信息

在CaSO_4-CaCO_3-(NH_4)_2CO_3-H_2O反应体系中,生成碳酸钙与硫酸铵的控速步骤是石膏溶解。溶解表面被新生的碳酸钙结晶覆盖是重要影响因素。基于反应面模型,通过调整钙离子溶出速率与碳酸根加入速率之比(钙碳比),将反应-结晶面控制在溶解表面的固液扩散边界层临界距离之外从而避免覆盖。实验采用表面积一定的天然纯净块状石膏试样,并向溶解体系滴加碳酸铵溶液,使钙碳比分别为0.125、0.25、0.5、1、2、4和8,观察碳酸钙在石膏表面的包覆现象,并预测反应-结晶面与溶解表面之间的微距离。结果显示,当钙碳比为0.125、0.25、0.5和1时,试样表面出现碳酸钙包覆但包覆量随λ增大而减小;当钙碳比为2、4和8时,试样表面不出现包覆,碳酸钙结晶生成于液相主体。将钙碳比为1视为临界值,该条件下反应-结晶面与溶解表面的微距离大于18μm。

关键词：反应结晶包覆钙碳比二氧化碳捕集

Parallel Physics-Informed Neural Networks Method with Regularization Strategies for the Forward-Inverse Problems of the Variable Coefficient Modified KdV Equation

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Journal of Systems Science & Complexity 2024年第2期37卷 511-544页

作者： zhou Huijuan School of Science Shanghai Maritime UniversityShanghai 201306China

This paper mainly introduces the parallel physics-informed neural networks(PPINNs)method with regularization strategies to solve the data-driven forward-inverse problems of the variable coefficient modified Korteweg-de Vries(VC-MKdV)*** the forward problem of the VC-MKdV equation,the authors use the traditional PINN method to obtain satisfactory data-driven soliton solutions and provide a detailed analysis of the impact of network width and depth on solving accuracy and ***,the author finds that the traditional PINN method outperforms the one with locally adaptive activation functions in solving the data-driven forward problems of the VC-MKdV *** for the data-driven inverse problem of the VC-MKdV equation,the author introduces a parallel neural networks to separately train the solution function and coefficient function,successfully addressing the function discovery problem of the VC-MKdV *** further enhance the network’s generalization ability and noise robustness,the author incorporates two regularization strategies into the *** amount of numerical experimental data in this paper demonstrates that the PPINNs method can effectively address the function discovery problem of the VC-MKdV equation,and the inclusion of appropriate regularization strategies in the PPINNs can improves its performance.

关键词： Data-driven forward-inverse problems parallel physics-informed neural networks regularization strategies variable coefficient modified KdV equation

Influence of stearic acid surface modification on flowability and agglomeration of battery grade Li_(2)CO_(3)powder

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Particuology 2024年第9期92卷 263-277页

作者： Ming zhou Lithium Industry Center Zhejiang New Era Zhongneng Technology Co.Ltd.Shaoxing312000China

This work investigates the flow and agglomeration behaviors of battery grade Li_(2)CO_(3)powder and the influence of stearic acid surface *** degree of agglomeration is directly related to the uniformity of Li_(2)CO_(3)and its powder *** to the Chinese National Nonferrous Metal Industry Standard,battery grade Li_(2)CO_(3)powder has D50 equal to 3–8μm which belongs to a micron-sized superfine ***,with the extension of storage time,the serious agglomeration phenomenon occurs due to the large specific surface area and rough and irregular powder *** Hausner ratio(HR)of the unmodified sample increases from 1.14 to 1.41,and the corresponding flowability is classified as good to ***,among samples with doping stearic acid,the optimum amount of it is 0.10 wt%which exhibits an extremely stable HR value from 1.14 to ***,after 156 days,the repose angle(AR)obtained for samples without surface modification and using 0.10 wt%stearic acid are calculated to be 49°and 28°,*** on the values of HR and AR,the flowability of the unmodified sample is poor while the sample modified with 0.10 wt%of stearic acid still maintain excellent powder flow ***,The LiMn_(2)O_(4)cathode material synthesized from modified Li_(2)CO_(3)powder with a stearic acid content of 0.10 wt%exhibits good crystallinity and comparable electrochemical performance to that prepared by commercial Li_(2)CO_(3).These results indicate that stearic acid has the potential to be an ideal modifier for battery grade Li_(2)CO_(3)powder that needs to be kept for a long time.

关键词： Battery grade Li_(2)CO_(3)powder Flowability Surface modification Stearic acid

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沉淀—胶溶法制备偏钛酸型锂离子交换剂研究

钢铁钒钛 2017年第3期38卷 38-44页

作者：姚歉歉周加贝张理元杨双周大利四川大学材料科学与工程学院四川成都610064 四川大学化学化工学院四川成都610064 内江师范学院化学化工学院四川内江641000

报道一种制备Li_2TiO_3的新方法—无机沉淀胶溶法。以硫酸氧钛为钛源、乙酸锂为锂源、过氧化氢为络合剂,经沉淀-胶溶制备钛-锂溶胶体系,再经干燥、煅烧、酸洗制备偏钛酸型锂吸附剂。采用FTIR、TG-DSC、XRD、SEM、ICP、Zetasizer Nano及... 详细信息

报道一种制备Li_2TiO_3的新方法—无机沉淀胶溶法。以硫酸氧钛为钛源、乙酸锂为锂源、过氧化氢为络合剂,经沉淀-胶溶制备钛-锂溶胶体系,再经干燥、煅烧、酸洗制备偏钛酸型锂吸附剂。采用FTIR、TG-DSC、XRD、SEM、ICP、Zetasizer Nano及旋转式黏度计等测试、表征手段,考察了各制备条件对溶胶体系稳定性、干凝胶及Li_2TiO_3显微结构特性及性能的影响。结果表明:乙酸锂为锂源,体系pH值为7,Ti^(4+)浓度为0.2 mol/L,经陈化24h,可得到黏度为7.3 m Pa·s,Zeta电位为-29.5 m V的稳定溶胶体系。红外光谱分析表明干凝胶中含过氧键;干凝胶较佳煅烧温度和煅烧时间分别为750℃、2 h,制备得到β-Li_2TiO_3,;将β-Li_2TiO_3用0.2 mol/L盐酸溶液进行酸洗制备得到偏钛酸型锂吸附剂H_2TiO_3,锂的酸洗率为85.31%,锂的再吸附容量为27.15 mg/g。

关键词：偏钛酸型锂吸附剂沉淀胶溶法硫酸氧钛乙酸锂吸附容量