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Depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 335-345页

作者： Feng Zhang Chenyang Zhang Linlin Wu Wei Sun Hongliang Zhang Jianhua Chen Yong Pei Songjiang Li Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Hunan International Joint Research Center for Efficient and Clean Utilization of Critical Metal Mineral ResourcesSchool of Minerals Processing and BioengineeringCentral South UniversityChangsha 410083China State key laboratory of Mineral Processing Beijing General Research Institute of Mining&MetallurgyBeijing 100160China Hunan Provincial key laboratory of Micro&Nano Materials Interfaces Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Department of Chemistry Xiangtan UniversityXiangtan 411105China China Railway Resource Group Co.Ltd Beijing 102300China

The depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite still lacked in-depth ***,the depression mechanism of sulfite ions on sphalerite and Pb^(2+)activated sphalerite in the flotation separation of galena from sphalerite was further systematically investigated with experiments and density functional theory(DFT)*** X-ray photoelectric spectroscopy(XPS)results,DFT calculation results,and frontier molecular orbital analysis indicated that sulfite ions were difficult to be adsorbed on sphalerite surface,suggesting that sulfite ions achieved depression effects on sphalerite through other non-adsorption ***,the oxygen content in the surface of sphalerite treated with sulfite ions in creased,which enhanced the hydrophilicity of the sphalerite and further increased the difference in hydrophilicity between sphalerite and ***,sulfite ions were chelated with lead ions to form PbSO_(3)in *** hydrophilic PbSO_(3)was more easily adsorbed on sphalerite than *** interaction between sulfite ions and lead ions could effectively inhibit the activation of *** addition the UV spectrum showed that after adding sulfite ions,the peak of perxanthate in the sphalerite treated xanthate solution was significantly stronger than that in the galena with xanthate solution,indicating that xanthate interacted more readily with sulfite ions and oxygen mo lecules within the sphalerite system,leading to the formation of ***,sulfite ions hardly depressed the flotation of ga lena and could promote the flotation of galena to some *** study deepened the understanding of the depression mechanism o sulfite ions on sphalerite and Pb^(2+)activated sphalerite.

关键词： sphalerite galena sulfite ion density functional theory depression mechanism

Photoluminescent two-dimensional SiC quantum dots for cellular imaging and transport

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Nano Research 2018年第8期11卷 4074-4081页

作者： Yu Cao Haifeng Dong Shaotao Pu Xueji Zhang Research Center for bioengineering and sensing technology Beijing Key Laboratory for Bioengineering and Sensing TechnologSchool of Chemistry & Biological Engineering University of Science & Technology Beijing Beijing 100083 China

Two-dimensional （2D） ultrathin SiC has received intense attention due to its broad band gap and resistance to large mechanical deformation and external chemical corrosion. However, the synthesis and application of ultrasmall 2D SiC quantum dots （QDs） has not been explored. Herein, we synthesize a type of monolayered 2D SiC QDs with advanced photoluminescence （PL） properties via a facile hydrothermal route. Their average size and thickness can be easily adjusted by altering the reaction time. The ultrasmall 2D SiC QDs exhibit a long fluorescence lifetime of 2.59 ps due to efficient quantum confinement. The applications of SiC QDs are demonstrated through labeling A549, HeLa, and NHDF cells and delivering agents for intracellular low-abundant microRNA （miRNA） detection. This advance in preparing photoluminescent SiC QDs is of great significance for broadening their potential in biomedical and optical applications.

关键词： two-dimensional SiC quantum dots cellular imaging intraceUular microRNA(miRNA) detection

Near-infrared light-driven yolk@shell carbon@silica nanomotors for fuel-free triglyceride degradation

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Nano Research 2021年第3期14卷 654-659页

作者： Yi Xing Songsong Tang Xin Du Tailin Xu Xueji Zhang Research Center for bioengineering and sensing technology Beijing Key Laboratory for Bioengineering and Sensing TechnologyDepartment of Chemistry&Biological EngineeringUniversity of Science&Technology BeijingBeijing100083China

Yolk@shell mesoporous nanoparticles have received close attention due to their controllable structures and integrated ***,most yolk@shell nanosystems lack ***,yolk@spiky-shell structured carbon@silica nanomotors are fabricated with near-infrared(NIR)light self-thermophoretic propulsion as lipase nanocarriers for fuel-free triglyceride *** light propulsion accelerates the accumulation of nanomotors on the droplet interface,and the efficient lipase loading further facilitates the rapid degradation of tributyrin *** adjusting the yolk and spiky structure,the obtained semi-yolk@spiky-shell structured nanomotors exhibit the highest capacity of lipase(442 mg/g)and the highest light-driven diffusion coefficient(ca.55%increase under 2 W/cm^(2 )irradiation),thus improving the degradation efficiency of triglyceride(93.1%under NIR light vs.66.7%without NIR light within 20 min).This work paves the way to rationally design yolk@shell structured nanomotors for diverse applications.

关键词： yolk@spiky-shell carbon@silica nanomotors self-thermophoresis triglyceride degradations

Enhanced lateral flow assay with double conjugates for the detection of exosomes

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Science China Chemistry 2018年第11期61卷 1423-1429页

作者： Tingting Wu Yuemeng Yang Yu Cao Yan Huang Li-Ping Xu Xueji Zhang Shutao Wang Research Center for bioengineering and sensing technology Beijing Key Laboratory for Bioengineering and Sensing Technology School of Chemistry and Biological Engineering University of Science and Technology Beijing CAS key laboratory of Bio-inspired Materials and Interfacial Science CAS Center for Excellence in Nanoscience Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Exosomes are promising biological biomarkers for monitoring a number of diseases, especially cancers. Here, we developed a double gold nanoparticles （GNPs） conjugates based lateral flow assay （D-LFA） for rapidly and sensitively detecting and molecular profiling of exosomes. Based on these two GNPs conjugates, the signal amplification can be achieved without any additional operation. The antibody on the 1st GNPs conjugate could recognize exosomes and form a sandwich format on the test zone. The 2nd GNPs conjugate was designed to bind to the 1st GNPs conjugate to realize signal amplification. This biosensor enabled visual and quantitative detection of exosomes by the accumulation of GNPs on the test zone and showed a low detection limit of 1.3x10^3 particles/laL, which has been improved 13-fold compared with the normal lateral flow assay. The D-LFA exhibited good sensitivity and reproducibility and has been successfully used for the detection ofexosomes in fetal bovine serum, which proved its potential application in practical diagnostics.

关键词： exosome lateral flow assay double GNPs conjugates visual detection signal amplification

Latent fingerprint enhancement on conductive substrates using electrodeposition of copper

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Science China Chemistry 2015年第7期58卷 1200-1205页

作者： Meiqin Zhang Xi Yu Gang Qin Yu Zhu Meiling Wang Qianhui Wei Yang Zhang Xueji Zhang Research Center for bioengineering and sensing technology University of Science and Technology Beijing

We presented a novel method for the development of a latent fingerprint by selective electrodeposition of a copper thin film from sulfate solution onto the conductive substrate between fingerprint ridges to generate a negative image of the fingerprint deposit. After optimizing the parameters(deposition time, deposition potential, and copper concentration), the preferential electrodeposition of copper films allowed latent fingerprints on six kinds of conductive surfaces(indium/tin oxide-coated glass, silver sheet, platinum sheet, gold sheet, copper sheet, and a stainless steel coin) to be successfully developed with high resolution. In addition, this technique could also be exploited to visualize latent fingerprints on rough and dirty surfaces. The quality of the developed fingerprints was estimated visually and the morphology of the copper film was characterized by field emission scanning electron microscopy.

关键词： latent fingerprint visualization electrodeposition copper thin film forensic science electrochemistry

Universal and one-step visualization of latent fingermarks onvarious surfaces using hydrophilic cellulose membrane and dye aqueous solution

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Science China Chemistry 2017年第9期60卷 1250-1257页

作者： Qianhui Wei Xiaolong Li Xin Du Xueji Zhang Meiqin Zhang Research Center for bioengineering&sensing technology University of Science&Technology BeoingBeijing 100083China

A high-resolution and universal method for the rapid visualization of latent fingermarks on a broad variety of surfaces has been achieved by simply combining hydrophilic cellulose membrane with dye aqueous solution. In this approach, the relatively hydrophobic characteristic of fingermark residue enable the deposit act as a “mask”, directing dye absorption processes to regions of both furrows without the ridge residues and bare cellulose membrane substrate. This effect during the spatially selective dye absorption generates a negative pattern of the fingermark within a few seconds to minutes depending on the properties of the substrates and fingermark types. It provides observation of latent fingermarks on cellulose membrane surface with high definition of level 2 and level 3 details used for personal identification purposes. It is also highly-efficient for visualizing the latent fingermarks lifted from various common (glass, carton, ceramic cup) and problematic (banknote, human skin and leather) surfaces by using transparent adhesive tape. To examine the generality of the proposed method, eight different kinds of dye aqueous solutions have been tested for developing latent fingermarks and they all provide very good results as expected. Moreover, this approach is easily used for aged fingermarks and natural fingermarks as well. Imaging may be accomplished visibly (by dye color) and topographically (using a microscope or a camera). This approach is a simple, rapid, non-destructive, safe, low-cost, universal and high resolution method compared with conventional approaches, so it demonstrates good potentiality in individual identity validation related applications. © 2017, Science China Press and Springer-Verlag Berlin Heidelberg.

关键词： Cellulose Hydrophilicity Membranes Substrates Visualization

Visualization of latent fingerprints using Prussian blue thin films

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Chinese Chemical Letters 2013年第2期24卷 173-176页

作者： Gang Qin Mei-Qin Zhang Yang Zhang Yu Zhu Shou-Liang Liu Wen-Jin Wu Xue-Ji Zhang Research Center for bioengineering and sensing technology University of Science and Technology Beijing

Received 15 November 2012 Received in revised form 5 December 2012 Accepted 12 December 2012 Available online 20 January 2013

关键词： Forensic sciencePrussian blueElectrodepositionLatent fingerprints

Porous nanofibrous dressing enables mesenchymal stem cell spheroid formation and delivery to promote diabetic wound healing

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Chinese Journal of Chemical Engineering 2024年第4期68卷 156-164页

作者： Kexin Zhang Wenmin Zhang Heng An Zhe Huang Yanzhen Wen Xiangyu Jiao Yongqiang Wen College of Chemical Engineering and technology Taiyuan University of Science and TechnologyTaiyuan 030024China beijing key laboratory for bioengineering and sensing technology Daxing Research InstituteSchool of Chemistry&Biological EngineeringUniversity of Science&Technology BeijingBeijing 100083China

Delayed and nonhealing of diabetic wounds imposes substantial economic burdens and physical pain on *** stem cells(MSCs)promote diabetic wound *** when MSCs aggregate into multicellular spheroids,their therapeutic effect is ***,traditional culture platforms are inadequate for the efficient preparation and delivery of MSC spheroids,resulting in inefficiencies and inconveniences in MSC spheroid *** this study,a three-dimensional porous nanofibrous dressing(NFD)is prepared using a combination of electrospinning and homogeneous *** thermal crosslinking,the NFD not only achieves satisfactory elasticity but also maintains notable *** the design of its structure and chemical composition,the NFD allows MSCs to spontaneously form MSC spheroids with controllable sizes,serving as MSC spheroid delivery systems for diabetic wound *** importantly,MSC spheroids cultured on the NFD exhibit improved secretion of vascular endothelial growth factor,basic fibroblast growth factor,and hepatocyte growth factor,thereby accelerating diabetic wound *** NFD provides a competitive strategy for MSC spheroid formation and delivery to promote diabetic wound healing.

关键词： Electrospinning Homogenization Biomedical engineering Nanomaterials Stem cell spheroids Diabetic wound healing

Distributed Field Rotator Composed of Isolated Components

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Chinese Physics Letters 2014年第4期31卷 50-53页

作者： LIU Guo-Chang LI Chao SHAO Jin-Jin FANG Guang-You key laboratory of Electromagnetic Radiation and sensing technology Chinese Academy of Sciences Beijing 100190

Transformation optics offers remarkable control over electromagnetic fields and has recently opened an exciting gateway to design ＇field rotator devices＇. We propose a distributed field rotator with open windows based on composite transformation optics, which consists of a central circular region and several isolated components. The number, position and size of the components can be controlled freely by the design purpose. Full-wave simulations are performed to demonstrate its function, which is equivalent to a classic field rotator. However, such a distributed rotator makes it much easier to access and make use of the rotated field in the central region, compared to the closed classic field rotator, especially in the case of 3D situations.

关键词： Components Distributed components