检索结果-南通市图书馆

Utilizing Multilayer Design of Organic-Inorganic Hybrids to Enhance Wearable Strain Sensor in Humid Environment

Chinese Journal of Polymer Science 2023年第7期41卷 1037-1050页

作者： Chen-Chen Lu Wei-Chen Gao Peng Li Wei Wu Robert K.Y.Li Hui Zhao guangxi key laboratory of Clean Pulp&Papermaking and Pollution Control School of Light Industry and Food EngineeringGuangxi UniversityNanning530004China guangxi key laboratory of calcium carbonate resources comprehensive utilization College of Materials and Chemical EngineeringHezhou UniversityHezhou542899China Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong Kong999077China

Flexible strain wearable sensors have attracted considerable attention due to their advantages of low cost, lightweight, high sensitivity and good flexibility. However, the strain sensors are easy to be damaged in an extreme humidity environment or by the wearer’s sweat in the process of use, resulting in detection disorder or even a short circuit. Furthermore, preparation of sensors with stable properties under extreme environments is one of the most important research directions. To fill this gap, a flexible sensor was prepared by using polyurethane and carbon nanotubes, then modified by polydopamine and 1H,1H,2H,2H-perfluorodecane-mercaptan. A typical tunnel model was used to explain the working mechanism of the sensor, the sensitivity of the sensor is also explained and evaluated by the tunneling theory. The results show that the sensor has good sensitivity (the sensor has a stable sensing signal output under a strain range from 2% to 300%) and stability over 8500 cycles. At the same time, the sensor has good superhydrophobicity, the water contact angle reaches 152°, and it is still stable in a humid environment. Moreover, this sensor shows excellent performance in monitoring human joint motion (such as finger, elbow, wrist and knee) and physiological signals (such as speaking and drinking). This work provides an effective design method for the sensor which can be applied in a high humidity environment.

关键词： Wearable strain sensor Polyurethane Carbon nanotubes Superhydrophobicity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mechanism of calcium lignosulfonate in apatite and dolomite flotation system

引用

International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1697-1704页

作者： Bo Feng Liangzhu Zhang Wenpu Zhang Huihui Wang Zhiyong Gao Jiangxi key laboratory of Mining Engineering Jiangxi University of Science and TechnologyGanzhou 341000China key laboratory of Hunan Province for Clean and Efficient utilization of Strategic calcium-containing Mineral resources Central South UniversityChangsha 410083China State key laboratory of Rare Metals Separation and comprehensive utilization Guangzhou 510600China

Since the physical and chemical properties of apatite and dolomite can be similar,the separation of these two minerals is ***,when performing this separation using the flotation method,it is necessary to search for selective *** experimental research was performed on the separation behavior of apatite and dolomite using calcium lignosulfonate as a depressant,and the mechanism by which this occurs was *** results show that calcium lignosulfonate has a depressant effect on both apatite and dolomite,but the depressant effect on dolomite is stronger at the same *** analysis shows that the adsorptive capacity of calcium lignosulfonate on dolomite is higher than that of apatite,which is due to the strong reaction between calcium lignosulfonate and the Ca sites on *** addition,there is a hydrogen bond between calcium lignosulfonate and dolomite,which further prevents the adsorption of sodium oleate to dolomite,thus greatly inhibiting the flotation of dolomite.

关键词： apatite dolomite calcium lignosulfonate depression mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation of wettable TiB2-TiB/Ti cathode by electrolytic boronizing for aluminum electrolytic

引用

Journal of Central South University 2019年第10期26卷 2681-2687页

作者： HUANG You-guo WANG Yi ZHANG Xiao-hui WANG Hong-qiang LI Qing-yu guangxi key laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China guangxi key laboratory of comprehensive utilization of calcium carbonate resources College of Materials and Environmental EngineeringHezhou UniversityHezhou 542899China

According to the problems of short life and low strength of TiB2 coating cathode for current technology in aluminium electrolysis industry,this work synthesized TiB2-TiB/Ti gradient composite with TiB2 coating and TiB whiskers in metallic Ti matrix by a electrolytic boronizing method based on similar density and thermal expansivity of the three *** phase composition and morphology of the cross-section were determined by X-ray diffraction(XRD),scanning electronic microscope(SEM)and X-ray energy dispersive spectrum(EDS).The results show that uniform TiB2 layer with a thickness of 8-10μm is continuously coated on the surface while the TiB whisker connected with TiB2 layer was embedded dispersedly into the *** TiB crystal whisker has a maximum length of about 220μ*** growth rate of TiB2 and TiB is enhanced by the strong reduction of *** novel gradient design of the composite helps to extend life and improve strength of the TiB2 cathode in aluminium electrolysis.

关键词： aluminium electrolysis electrolytic boronizing titanium diboride gradient materials

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Surface modification of calcium carbonate:A review of theories,methods and applications

引用

Journal of Central South University 2021年第9期28卷 2589-2611页

作者： LI Chun-quan LIANG Chao CHEN Zhen-ming DI Yong-hao ZHENG Shui-lin WEI Shi SUN Zhi-ming School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China guangxi key laboratory of calcium carbonate resources comprehensive utilization College of Materials and Chemical EngineeringHezhou UniversityHezhou 542899China

calcium carbonate,which is widely employed as a filler added into the polymer matrix,has large numbers of applications owing to the excellent properties such as low cost,non-toxicity,high natural reserves and ***,in order to obtain the good filling effect,calcium carbonate needs to be surface modified by organic molecules so as to enhance the dispersion and compatibility within the *** review paper systematically introduces the theory,methods,and applications progress of calcium carbonate with surface ***,the key factors that affect the properties of the composites as well as the current difficulties and challenges are *** current research progress and potential application prospects of calcium carbonate in the fields of plastics,rubber,paper,medicine and environmental protection are discussed as ***,this review can provide valuable reference for the modification and comprehensive utilization of calcium carbonate.

关键词： calcium carbonate surface modification polymer-based composite monolayer coating modification mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Regulating local chemical environment in O_(3)-type layered sodium oxides by dual-site Mg^(2+)/B^(3+)substitution achieves durable and high-rate cathode

引用

Chinese Chemical Letters 2024年第9期35卷 469-474页

作者： Guangchang Yang Shenglong Yang Jinlian Yu Yishun Xie Chunlei Tan Feiyan Lai Qianqian Jin Hongqiang Wang Xiaohui Zhang guangxi key laboratory of Low Carbon Energy Materials Guangxi New Energy Ship Battery Engineering Technology Research CenterGuangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and DevicesSchool of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China College of Materials and Chemical Engineering Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive UtilizationHezhou UniversityHezhou 542899China School of Civil Engineering and Architecture Center for the Structure of Advanced MatterSchool of Electronic EngineeringGuangxi University of Science and TechnologyInstitute of New Building Materials and Engineering ApplicationsLiuzhou 545006China

The O_(3)-Na_(0.85)Ni_(0.2)Fe_(0.4)Mn_(0.4)O_(2)layered oxide cathode material possesses the advantages of high specific capacity,low cost,and simple ***,sluggish kinetics and complicated phase transition caused by the large size difference between Na+and tetrahedral gaps lead to poor rate and cycling ***,a scalable and feasible strategy was proposed to modulate local chemical environment by introducing Mg^(2+)and B^(3+)into O_(3)-Na_(0.85)Ni_(0.2)Fe_(0.4)Mn0.4O_(2),which can distinctly improve kinetic transport rate as well as electrochemical *** capacity retention of O_(3)-(Na_(0.82)Mg_(0.04))(Ni_(0.2)Fe_(0.4)Mn_(0.4))B_(0.02)O_(2)(NFMB)increases from 43.3%and 12.4%to 89.5%and 89.0%at 1 C and 3 C after 200 cycles,***,the electrode still delivers high rate capacity of 93.9 mAh/g when current density increases to 10 ***^(2+)ions riveted on Na layer act as a“pillar”to stabilize crystal structure and inhibit structural change during the desodiumization process.B^(3+)ions entering tetrahedral interstice of the TM layer strengthen the TM-O bond,lower Na+diffusion energy barrier and inhibits the slip of TM ***,the assembled full batteries with the modified cathode material deliver a high energy density of 278.2Wh/kg with commercial hard carbon as *** work provides a strategy for the modification of high-performance SIB layered oxide materials to develop the next-generation cost-effective energy storage grid systems.

关键词： Sodium-ion batteries Layered cathode material DFT calculation Local chemistry environment Magnesium/boron co-substitution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of chemical composition on the element distribution,phase composition and calcification roasting process of vanadium slag

引用

International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2144-2151页

作者： Tangxia Yu Tao Jiang Jing Wen Hongyan Sun Ming Li Yi Peng State key laboratory of Vanadium and Titanium resources comprehensive utilization Panzhihua 617000China School of Metallurgy Northeastern UniversityShenyang 110819China key laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education Northeastern UniversityShenyang 110819China Liaoning key laboratory for Metallurgical Sensor and Technology Shenyang 110819China

The chemical composition of vanadium slag significantly affects its element distribution and phase composition,which affect the subsequent calcification roasting process and vanadium *** this work,seven kinds of vanadium slags derived from different regions in China were used as the raw materials to study the effects of different components on the vanadium slag’s elements distribution,phase composition,calcification roasting,and leaching rate of major elements using scanning electron microscope,X-ray diffraction analysis,and inductively coupled plasma-optical emission *** results show that the spinel phase is wrapped with silicate phase in all vanadium slag *** main elements in the spinel phase are Cr,V,and Ti from the interior to the *** size of spinel phase in low chromium vanadium slag is larger than the other vanadium slags with higher chromium *** spinel phase of high-calcium and high-phosphorus vanadium slag is more *** strongest diffraction peak of vanadium spinel phase in the vanadium slag migrates to a higher diffraction angle,and(Fe_(0.6)Cr_(0.4))_(2)O_(3)is formed after calcification roasting as the chromium content increased.A large amount of Ca_(2)SiO_(4)is produced because excess Ca reacts with Si in high-calcium and high-phosphorus vanadium *** vanadium leaching rate reaches 88%in some vanadium *** chromium leaching rate is less than 5%in all vanadium *** silicon leaching rate of high-calcium and high-phosphorus vanadium slag is much higher than that of the other *** leaching rate of manganese is higher than 10%,and the leaching rates of iron and titanium are negligible.

关键词： vanadium slag calcification roasting element distribution phase composition leaching rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Genesis and geological significance of carbonate in Changdu Basin,Xizang,China:Constraints from geochemistry and C-O isotopes

引用

Acta Geochimica 2024年第6期43卷 1192-1204页

作者： Wenhua Han Yongshou Li Haizhou Ma Huaide Cheng Binkai Li Qinyu Hai Xuahai Ma key laboratory of comprehensive and Highly Effi cient utilization of Salt Lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial key laboratory of Geology and Environment of Salt Lakes Xining 810008China

Research on the origin of carbonates in Changdu Basin holds significant importance for understanding the regional potash formation *** on a comprehensive review of previous studies,field geological surveys,and laboratory investigations,this study analyzes the origin and properties of carbonates within the context of regional potash *** studies show that magnesite deposits,with the characteristics of sedimentary *** results of elemental geochemical analysis show that the carbonates in this area were formed in the sedimentary environment via evaporation followed by concentration,and the formation of magnesite was possibly caused by the substitution of calcium in the dolomite with magnesium-rich ***δ^(13)C values of carbonats in the study area are between5.9‰and 9.1‰.Theδ^(18)O values of magnesite samples range from-7.3‰to-1.3‰,and theδ^(18)O values of dolomites range from-10.3‰to-8.4‰.All the calculated Z values of oxygen isotopes of carbonates greater than 120.A comprehensive analysis of carbon and oxygen isotopes indicates that the magnesite was formed in a highly concentrated Marine sedimentary environment and does not show any relation with the metasomatism of hydrothermal *** results on the correlation of magnesite with seawater and its sedimentary origin provide key information for explaining the migration direction of brine between the Changdu and Lanping-Simao *** residual metamorphic seawater in the Changdu Basin migrated to the Lanping-Simao Basin,where potash underwent ***,magnesite and dolomite in the early stage of potash formation were left in the Changdu Basin.

关键词： Changdu basin Carbonatite Geochemistry Mineral deposit genesis Significance of potash formation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of boron isotopes in halite as an indicator of the salinity of Qarhan paleolake water in the eastern Qaidam Basin, western China

引用

Geoscience Frontiers 2019年第1期10卷 253-262页

作者： Yongsheng Du Qishun Fan Donglin Gao Haicheng Wei Fashou Shan Binkai Li Xiangru Zhang Qin Yuan Zhanjie Qin Qianhui Ren Xueming Teng key laboratory of comprehensive and Highly Efficient utilization of Salt Lake resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences key laboratory of Salt Lake Geology and Environment of Qinghai Province University of Chinese Academy of Sciences Tianjin Center China Geological Survey

In this study, nineteen brine samples from the Qarhan Salt Lake(QSL) in western China were collected and analyzed for boron(B) and chlorine(Cl) concentrations, total dissolved solids(TDS), pH values and stable B isotopic compositions. The B concentrations and δ^(11) B values of brines in the QSL range from 51.6 mg/L to138.4 mg/L, and from +9.32& to +13.08&, respectively. By comparison of B concentrations and TDS of brines in QSL with evaporation paths of brackish water, we found that B enrichment of brines primarily results from strong evaporation and concentration of Qarhan lake water. Combining with comparisons of B concentrations, TDS, p H values and δ^(11) B values of brines, previously elemental ratios(K/Cl, Mg/Cl, Ca/Cl, B/Cl) and δ^(11) B values of halite from a sediment core(ISL1 A), we observe good correlations between B concentrations and TDS, TDS and pH values, pH and δ^(11) B values of brines, which demonstrate that higher B concentrations and more positive δ^(11) B values of halite indicate higher salinity of the Qarhan paleolake water as well as drier paleoclimatic conditions. Based on this interpretation of the δ^(11) B values of halite in core ISL1 A, higher salinity of the Qarhan paleolake occurred during two intervals, around 46-34 ka and26-9 ka, which are almost coincident with the upper and lower halite-dominated salt layers in core ISL1 A,drier climate phases documented from the δ^(18) O record of carbonate in core ISL1 A and the paleomoisture record in monsoonal central Asia, and a higher solar insolation at 30°N. These results demonstrate that the δ^(11) B values of halite in the arid Qaidam Basin could be regarded as a new proxy for reconstructing the salinity record of paleolake water as well as paleoclimate conditions.

关键词： B isotope compositions Brine Chemical concentrations Qarhan salt lake Western China Salinity of paleolake water

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Leaching calcium from phosphogypsum desulfurization slag by using ammonium chloride solution: Thermodynamics and kinetics study

引用

Chinese Journal of Chemical Engineering 2020年第1期28卷 208-215页

作者： Yanjun Zhong Ting Shi Qiuge Chen Xiushan Yang Dehua Xu Zhiye Zhang Xinlong Wang Benhe Zhong School of Chemical Engineering Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources of Ministry of EducationSichuan UniversityChengdu 610065China

Phosphogypsum(PG) desulfurization slag is a calcium-rich residue from reductive decomposition of PG using sulfur as the reductant. We proposed a technology of preparation light calcium carbonate with PG desulfurization slag, which mainly contains two steps: leaching and carbonizing. In this work, we concentrated on the former, in which ammonium chloride aqueous solution was utilized as leaching agent to extract calcium from the slag, and conducted thermodynamics and kinetics study on it. Fact Sage software was employed to do thermodynamic and phase equilibrium diagram calculations. The influence of leaching conditions including agitation speed, initial concentration of leaching solution, reaction temperature, and liquid/solid ratio on the calcium leaching rate was discussed in detail by means of experiment optimal design. A kinetic model developed from the shrinking core model was given to describe the leaching process. The apparent kinetic activation energy(Ea) of the leaching reaction was calculated to be 10.58 kJ·mol^-1.

关键词： PG desulfurization slag Leaching process Thermodynamics Kinetic model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Studies of benzyl hydroxamic acid/calcium lignosulphonate addition order in the flotation separation of smithsonite from calcite

引用

International Journal of Mining Science and Technology 2021年第6期31卷 1153-1158页

作者： Cheng Liu Yuhua Zhu Kaihua Huang Siyuan Yang Zhian Liang School of resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China South China Institute of Environmental Sciences Ministry of Ecology and EnvironmentGuangzhou 510530China State key laboratory of Mineral Processing BGRIMM Technology GroupBeijing 102600China State key laboratory of comprehensive utilization of Low-Grade Refractory Gold Ores Xiamen 361101China

Flotation separation of smithsonite from calcite is difficult due to their similar surface *** the present study,a reagent scheme of depressant calcium lignosulphonate(CLS) and collector benzyl hydroxamic acid(BHA) was introduced in the flotation of smithsonite from *** tests revealed that the efficient flotation of smithsonite from calcite could only be obtained with the addition order of BHA before CLS,which was opposite to the widely-used order that adding depressant prior to the *** zeta potential measurements indicated that BHA selectively adsorbed onto smithsonite surface,then not allowed the CLS adsorption onto the smithsonite surface rather than calcite surface because of the steric hindrance,thereby the smithsonite surface remained hydrophobic while calcite surface became more hydrophilic after the addition of *** a result,the calcite flotation was completely depressed while the smithsonite flotation recovery was still in high value,leading to the optimal flotation separation performance.

关键词： Smithsonite Calcite Benzyl hydroxamic acid calcium lignosulphonate Flotation separation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：