JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xianhua Hou,Miao Zhang,Jiyun Wang,Shejun Hu,Xiang Liu,Zongping Shao
A high yield and low-cost high-energy wet ball milling method is used for producing nano-flake Si@SiO 2 as an anode material for Li-ion batteries. After a two-step ball milling (coarse milling and fine milling) process, the irregular plate-like micrometric Si (average particle size is 27.4 μm) is fractured into nano-flake Si@SiO 2 (average particle size is 154.8 nm) with small crystalline grains and abundant grain boundaries. Due to the significant changes of the prepared nano-flake Si@SiO 2 in the surface composition, particle size and crystal structure, the ball milled Si shows better electrochemical performance compared with the as-received micrometric Si. And the fine milled Si shows the best electrochemical properties with a high initial coulombic efficiency of 84.6% and a specific capacity of 1920.4 mA h g −1 at a current density of 100 mA g −1 after 100 cycles.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
·
表面工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Chen Li,Liting Wei,Min Chen,Jiayi Zhang,Yang Yang,Boping Liu,Yulong Jin
CrO x /VO x /TiO 2 -SiO 2 was prepared via solvent-free and conventional wet-impregnation process with ethanol as solvent. The results of ICP-OES, N 2 adsorption-desorption, SEM-EDX, Raman and DR-Uv-vis spectra indicate that well-dispersed Cr and V sites in isolated state were the main species. Bimodal ultra-high molecular weight polyethylene/high-density polyethylene in-reactor blends (UHMWPE/HDPE IRBs) could be synthesized with polymerization activity ＞ 1×10 7 gPE·mol −1 Cr·h −1 . Moreover, the two catalysts displayed similar catalytic behaviors in temperature sensitivity, H 2 response and 1-hexene copolymerization efficiency, and their polymer products also show comparable molecular weight and molecular weight distribution , which implies analogous structures of their well-dispersed active sites. By contrast, the catalyst prepared by wet-impregnation process with water as solvent exhibited poor dispersity, which is reflected by its much lower activity and very different catalytic behaviors and polymer properties when compared with the well-dispersed catalysts. Therefore, the economic and green solvent-free process is promising for preparing highly-active CrO x /VO x /TiO 2 -SiO 2 .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Yulan Wang,Hongmin Ma,Xiaodong Wang,Xuehui Pang,Dan Wu,Bin Du,Qin Wei
An ultrasensitive sandwich-type electrochemical immunosensor based on a novel signal amplification strategy was developed for the quantitative determination of human immunoglobulin G (IgG). Pd nanocubes functionalized magnetic graphene sheet (Pd–Fe 3 O 4 -GS) was employed as the matrix to immobilize the primary antibodies (Ab 1 ). Owing to the synergetic effect between Pd nanocubes and magnetic graphene sheet (Fe 3 O 4 -GS), Pd–Fe 3 O 4 -GS can provide an obviously increasing electrochemical signal by electrochemical catalysis towards hydrogen peroxide (H 2 O 2 ). Silicon dioxide (SiO 2 ) was functionalized as the label to conjugate with the secondary antibodies (Ab 2 ). Due to the larger steric hindrance of the obtained conjugate (SiO 2 @Ab 2 ), the sensitive decrease of the electrochemical signal can be achieved after the specific recognition between antibodies and antigens. In this sense, this proposed immunosensor can achieve a high sensitivity, especially in the presence of low concentrations of IgG. Under optimum conditions, the proposed immunosensor offered an ultrasensitive and specific determination of IgG down to 3.2 fg/mL. This immunoassay method would open up a new promising platform to detect various tumor markers at ultralow levels for early diagnoses of different cancers.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Xiaoting Zhang,Shuangshuang Jing,Zehong Chen,Linxin Zhong,Qingzhong Liu,Xinwen Peng,Runcang Sun
3D porous inorganic materials play a vital role in various applications, such as adsorption, catalysis, and electrochemistry, and are an ongoing interest in the synthesis of advanced porous materials. Herein, we aimed to fabricate 3D free-standing hierarchical porous TiO 2 and SiO 2 with tunable porous structure and high specific surface area by using cellulose aerogel as a new biotemplate. The results revealed that the hierarchical porous structure of 3D porous TiO 2 and SiO 2 could be easily tailored by controlling annealing process. The physicochemical structure of the resultant porous materials, such as morphology, specific surface area and phase structure, strongly depended on the thermal stability of the biotemplate. 3D porous TiO 2 and SiO 2 with specific surface areas of high up to 221.1 m 2 /g and 451.3 m 2 /g could be obtained, respectively. In addition, the as-prepared TiO 2 exhibited a high photocatalytic activity, demonstrating their potential application in advanced photocatalysis.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Dandan Song,Jing Zheng,Nosang V. Myung,Jingli Xu,Min Zhang
A sandwich-type electrochemical immunosensor was developed for the detection of CEA where hollow magnetic silica coated nickel/carbon (Ni/ [email protected] 2 ) nanocomposites was used as an immobilized carrier and gold nanoparticle-coated PANI microsphere ( [email protected] @Au) as electrochemical transducer. Magnetic assembly of Ni/ [email protected] 2 nanocomposites allow easy separation and assembly which eliminates the further modification process. In addition, the prepared [email protected] @Au possess good biocompatibility, and electrical conductivity. The fabricated immunosensor show excellent sensing performance including a wide dynamic range from 0.006 to 12.00 ng mL −1 and low detection limit at 1.56 pg mL −1 . Moreover, this sensor shows superior selectivity with excellent reliability and reproducibility which might lead into easier implementation in clinical setting.
研究领域:
生物化学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSITION METAL CHEMISTRY
·
2024
·Vol. 49
·期 3
·195-213
·
IF 1.6
Gharbi Ahlam Hacine,Hemmami Hadia,Laouini Salah Eddine,Bouafia Abderrhmane,Ben Amor Ilham,Zeghoud Soumeia,Gherbi Mohammed Taher,Ben Amor Asma,Alharthi Fahad,Abdullah Johar Amin Ahmed
A novel CuO–SiO 2 nanoadsorbent, incorporating copper oxide (CuO) and silicon dioxide (SiO 2 ), has been successfully synthesized using three distinct preparation processes: Mode-A (solution and solution), Mode-B (solution and nanoparticles), and Mode-C (nanoparticles and nanoparticles). The investigation focuses on evaluating the efficiency of the CuO–SiO 2 nanoadsorbent, considering its synthesis process, reusability, and sustained performance over time, particularly in the removal of Rose Bengal dye. Characterization results revealed the formation of CuO–SiO 2 nanocomposites structure irregular shapes morphology across all three-preparation processes. The average particle sizes for Mode-A, Mode-B, and Mode-C nanocomposites were determined as 18.1 nm, 15.6 nm, and 14.8 nm, respectively. Furthermore, the band gap energies of the CuO–SiO 2 nanocomposites were measured at 2.2 eV, 1.8 eV, and 3.29 eV for Mode-A, Mode-B, and Mode-C, respectively. Remarkably, the CuO–SiO 2 nanocomposite prepared using Mode-B demonstrated superior photocatalytic activity in degrading the anionic dye Rose Bengal, achieving a degradation coefficient of 84.8%. In comparison, CuO NPs, tested under the same experimental conditions (120 min contact time, pH = 7, temperature of 25 °C, and solar light irradiation), achieved a degradation coefficient of 78.8%. These findings highlight the potential of the CuO–SiO 2 nanoadsorbent, particularly when synthesized via Mode-B, for effective and environmentally friendly dye degradation applications.
研究领域:
纳米技术
·
环境科学
·
材料科学
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 22
·26655-26665
·
IF 2.478
Yang Chengyu,Li Junkai,Lu Yang,Shan Yiting,Xian Qianqian,Zhou Hongqing
CaO-B 2 O 3 -SiO 2 (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na 2 O and K 2 O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO 3 and CaB 2 O 4 , and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na 2 O and K 2 O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na 2 O + K 2 O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm 3 , ε r = 5.94 and tan δ = 1.22 × 10 −3 at 10 GHz.
研究领域:
材料科学
·
陶瓷学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Jing Wang,Na Li,Feng Shao,Heyou Han
Highly luminescent, good stable and low toxic N-acetyl- l -cysteine (NAC) capped CdTe/CdS@ZnS–SiO 2 near-infrared (NIR)-emitting quantum dots (QDs) were successfully fabricated in aqueous solution via a microwave irradiation reduction route, in which thiol-capped CdTe/CdS QDs were employed as core templates and ZnCl 2 , NAC and tetraethyl orthosilicate as shell precursors. This presented ZnS-like clusters filled hybrid SiO 2 model not only greatly improved the brightness and stability of original CdTe/CdS QDs, but also tremendously decreased the cytotoxicity towards HeLa cells. Furthermore, it was found that Hg 2+ could effectively selective quench the QD NIR emission based on electron transfer process. On the basis of this fact, a simple, rapid and specific method for trace Hg 2+ determination was proposed. Under optimal conditions, the fluorescence intensity decreased linearly with the concentration of Hg 2+ ranging from 5.0 × 10 −9 to 1.0 × 10 −6 M and the limit of detection for Hg 2+ was 1.0 × 10 −9 M ( S / N = 3). As practical applications, the novel NIR sensor has been demonstrated to monitor and image Hg 2+ level in milk power and HeLa cells respectively with satisfactory results obtained.
研究领域:
材料科学
·
生物医学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 3
·1635-1649
·
IF 1.7
Pan Weixing,Chen Hui,Chen Aicheng
A series of low-cost α-Ni(OH) 2 /SiO 2 catalysts were successfully fabricated by the vapor-induced internal hydrolysis method, then the hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (BHMF) was investigated by using the ethanol as the hydrogen donor over these as-prepared α-Ni(OH) 2 /SiO 2 catalysts. Based on the reaction results, these as-prepared catalysts, which could dispense with extra pre-reduction treatment before reactions, exhibited superior catalytic performance for the HMF hydrogenation to BHMF. A remarkable intrinsic selectivity of BHMF selectivity of almost 100% with about 90% HMF conversion could be obtained under 195 °C for 5 h in an N 2 atmosphere over the α-Ni(OH) 2 /SiO 2 catalyst of 5-Ni(OH) 2 /SiO 2 with about 5 wt% Ni on SiO 2 . The almost constant HMF conversion and BHMF intrinsic selectivity found from the recycling tests can indicate that the catalyst was stable without the obvious loss of its catalytic activity after recycling. Moreover, the mechanism of HMF hydrogenation using ethanol over the α-Ni(OH) 2 /SiO 2 catalysts could be referred to as the mechanism of the Meerwein-Ponndorf-Verley reaction. This work will provide a simple synthesis method for future design and development of high-performance, low-cost, and low-energy consumption catalysts for HMF hydrogenation to BHMF.
研究领域:
催化化学
·
生物质转化
·
绿色化学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Jie Liu,Jianqiang Liu,Chenglei Wang,Zhongwei Ge,Dali Wang,Lixin Xia,Liang Guo,Na Du,Xiaotao Hao,Hongdi Xiao
The surface passivation strategy is one of the effective ways to improve the power conversion efficiency (PCE) of quantum dots-sensitized solar cells (QDSSCs). In this work, a novel ZnS/SiO 2 coating serves as the passivation layers for the CdS/CdSe co-sensitized solar cells based on zinc titanium mixed metal oxides (MMOs) obtained from layered double hydroxides (LDHs) precursor. The incorporation of passivation layers effectively improved the performance of the corresponding CdS/CdSe quantum dots co-sensitized solar cells and the best PCE of 4.91% has been achieved, which represents an over 55% improvement than that of devices without passivation. The effects of ZnS/SiO 2 double passivation layers were systematically investigated, especially by 2D time-resolved fluorescence imaging and electrochemical impedance spectroscopy technique . It was revealed that the existence of ZnS/SiO 2 outer layers caused the suppression of charge recombination, higher electrons collection efficiency, and superior surface quality.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2014
·
IF 2.269
Xiumei Tai,Zhiping Du,Wanxu Wang,Meifang Hou,Yonghong Zhao
The thermal responsive SiO 2 /poly-ether composites were prepared successfully by a simple and environment friendly method. The influences of modified concentration, reaction time and reaction temperature on the water contact angle of the prepared composites were studied. The as-prepared samples were analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and dynamic light scatter (DLS). The results suggest that the polymer chains had been grafted on the surface of nano-SiO 2 and the low critical solution temperature (LCST) of the composite was about 314 K.
研究领域:
材料科学
·
纳米技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 6
·749-756
·
IF 1.067
Zhou Xue-zheng,Yan Xiang-yang,Zhu Ling,Ma Ming,Dai Ya,Wang Chang-guo,Zhu Li-jun,Yu Ke-jie,Liu Shao-min
A new kind of phenyl-functionalized magnetic fibrous mesoporous silica (Fe 3 O 4 @SiO 2 @KCC-1-phenyl) was prepared by copolymerization as an efficient adsorbent for the magnetic extraction of phthalate esters from environmental water samples. The obtained Fe 3 O 4 @SiO 2 @KCC-1-phenyl showed monodisperse fibrous spherical morphology, fairly strong magnetic response (29 emu/g), and an abundant π -electron system, which allowed rapid isolation of the Fe 3 O 4 @SiO 2 @KCC-1-phenyl from solutions upon applying an appropriate magnetic field. Several variables that affect the extraction efficiency of the analytes, including the type of the elution solvent, amount of adsorbent, extraction time and reusability, were investigated and optimized. Under optimum conditions, the Fe 3 O 4 @SiO 2 @KCC-1-phenyl was used for the extraction of four phthalate esters from environmental water samples followed by high-performance liquid chromatographic analysis. Validation experiments indicated that the developed method presented good linearity (0.1–20 ng/mL), low limit of detection (7.5–29 µg/L, S / N =3). The proposed method was applied to the determination of phthalate esters in different real water samples, with relative recoveries of 93%−103.4% and relative standard deviation of 0.8%–8.3%.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）