Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 5
·3501-3511
·
IF 3.006
Chen Hongshuo,Liu Haibin,Cui Chuanjin,Zhang Xuechao,Yang Wei,Zuo Yueming
To effectively cut off the transmission of Brucella to humans through milk, a novel biosensor for detection of Brucella was constructed using cysteamine functionalized nanogold (Cys-Au) and 4-Mercaptobenzoic acid (4-MBA) modified gold electrode as the platform. The morphology of the prepared nanomaterials was characterized by laser particle sizer, XPS and SEM, and the results showed the 4-MBA film was modified on the gold electrode surface, and the diameter of successfully prepared nanogold and Cys-Au are about 55 and 65 nm, respectively. The electrochemical performance of the biosensor was tested in Brucella antigen solution by square wave voltammetry (SWV). The results showed the reproducibility and stability of the biosensor were good, the spiked recovery in milk was in the range of 95.12–105.27%, and the minimum detection limit (S/N = 3) was 5.12 × 10 2 cfu/mL with a linear range from 1.6 × 10 2 to 1.6 × 10 8 cfu/mL. In addition, the minimum detection limit was reduced from 5.12 × 10 2 cfu/mL to 7.0 × 10 1 cfu/mL after processing the SWV data by second-order derivative transformation, which showed Second-order derivative transformation is very helpful to further optimize the performance of the sensor. Compared with the previously reported test methods, the prepared biosensors have a wider linear range and lower limit of detection (LOD). Therefore, the constructed biosensor can be used as a promising tool for the trace detection of Brucella in milk samples.
研究领域:
食品科学
·
微生物学
·
生物传感技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 8
·1-13
·
IF 2.184
Qin Jianbin,Zhang Guangcheng,Shi Xuetao,Tao Min
The dispersions was prepared by dispersing hydrophilic silica nanoparticles with an average diameter of 50 nm in 1-butyl-methylimidazolium tetrafluoroborate ([C 4 mim][BF 4 ]), and investigated under the steady shear and oscillatory shear, respectively. Experimental results indicate that all of the dispersions present shear thinning, notable shear thickening, and shear thinning successively with increasing shear rate; the shear thickening behavior is derived from silica nanoparticle clusters and strongly controlled by silica nanoparticle content and temperature. The shear thickening fluid (STF) exhibits reversible property and transient response ability, and the time of transient response is no more than 100 ms. The conductivity of the STF is increased with increasing silica nanoparticle content, and the conductivity of 27 wt% dispersions is even two times as big as that of pure [C 4 mim][BF 4 ]. The dispersions with high solid content dilate and present a phase transition changing from a liquid-like to a solid-like soft material in the shear thickening region. A theoretical model is developed to imitate the mechanism of shear thickening in the dispersions.
研究领域:
材料科学
·
流变学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 10
·1287-1299
·
IF 1.906
Zheng Zhenan,Gao Xiang,Luo Yingwu
Electrode binders have significant influences on lithium-ion battery performance. Good binders should be able to absorb electrolyte to accelerate lithium-ion transport while simultaneously maintaining adequate adhesion and mechanical strength after swelling. Currently, most polymer binders are based on homo or random copolymers so they may only meet one of these requirements, as an improvement in electrolyte swelling ability is detrimental to mechanical strength, and vice versa. This work investigates whether the design of chain sequence can resolve this contradiction. Reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization is employed to synthesize copolymer latex with different chain sequences as electrode binders, which are examined in both LiFePO 4 cathode and silicon anodes. The results show a triblock copolymer chain sequence gives the best performance. The microphase separation in triblock copolymer distributes functionalities of electrolyte affinity and strength maintenance into disparate blocks and therefore satisfies both requirements simultaneously. The advantages of triblock chain sequence are demonstrated by superior ionic conductivity, mechanical strength after electrolyte absorption, and lithium-ion diffusion coefficient and then lead to better battery performance compared with random counterpart and commercial aqueous binders.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 10
·1-9
·
IF 2.584
Zhang Yu,Cao Ping,Lin Wei,Liu Qiang,Chen Ziyuan,Cao Jun,Yang Guannan,Cui Chengqiang
In this paper, a mixed sintering accelerator of colophony and cetyltrimethyl ammonium bromide (CTAB) was developed to improve the sintering properties of Cu nanoparticles (NPs) paste. With the synergy effect of the mixed sintering accelerator, Cu NPs paste could be well sintered at 260 °C for 30 min under a pressure of 2 MPa, and the shear strength was greatly improved from 15 to 33 MPa. The fracture morphology of the Cu NPs joint transformed from brittle interface failure features to ductile dimple features, and the porosity in the sintered layer was significantly reduced. XRD analysis further confirmed that the synergy of colophony and CTAB could effectively remove the oxides in the Cu NPs paste during sintering, and thereby improve the sintering properties. This work can provide an applicable approach to improve the sintering properties of metal NPs and help to understand the synergy effect of sintering accelerators on the bonding behaviors of metal nanoparticles at low temperatures. Graphic abstract
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 15
·7491-7502
·
IF 4.682
Zhai Shengnan,Yu Kejing,Meng Chaoran,Wang Hongbo,Fu Jiajia
In this paper, an eco-friendly method of producing hybrid silica aerogels by freeze-drying method (FD) is proposed. In the freeze-drying system, deionized water was the only solvent, hybrid aerogels were prepared by acid–base catalysis and sol–gel method using methyltrimethoxysilane (MTMS) and water–glass as co-precursors. The microstructure, specific surface area, pore size distribution and thermal properties of the hybrid aerogels were characterized and analyzed. It was found that all samples exhibited the dual-mesoporous structures, and the molar ratio of co-precursors had a significant effect on the performance of aerogels. The tap density decreased and the porosity increased with the increase in the molar ratio of MTMS, while the thermal diffusion coefficient and thermal conductivity of aerogel decreased first and then increased. Especially when the molar ratio is 2.0, the hybrid aerogels exhibited excellent insulation performance, such as thermal diffusion coefficient of 0.0183 mm s −1 , thermal conductivity of 0.0460 W(m k) −1 and great thermal stability up to 540 °C. It illustrates that hybrid aerogels have broad application prospects as insulation materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 3
·680-692
·
IF 1.532
Wang Zhen-Zhen,Zhai Shang-Ru,Zhai Bin,An Qing-Da,Li Shao-Wei
Abstract
A novel core–shell-structured Ag-based magnetic functional polymer nanocatalyst, i.e., Fe 3 O 4 @SN/GLA@chitosan-Ag (SN represents animo-functionalized SiO 2 , GLA signifies glutaraldehyde), was fabricated via a simple and environmentally friendly method. The magnetic separation property of Fe 3 O 4 , the protection effects of SiO 2 , the reduction and stabilization activities of chitosan, and the catalytic property of Ag nanoparticles (NPs) in the multifunctional catalyst system were efficiently combined using glutaraldehyde as bridging agent. The Ag NPs with average diameter about 2–11 nm were generated in situ and stabilized by chitosan, which acted as reducing agent and stabilizer in the absence of other potentially toxic reagents. Furthermore, the reduction, chelation ability of chitosan, and the size of Ag NPs were found to be tunable, thereby enabling the preparation of other noble metal catalysts with tailored properties. Most importantly, the as-prepared catalyst exhibited superior catalytic performance (the reduction reaction was finished within 3 min) and reusability (reusable for at least six times) in the reduction of 4-nitrophenol. Graphical Abstract
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Feng Sihua,Duan Hengli,Tan Hao,Hu Fengchun,Liu Chaocheng,Wang Yao,Li Zhi,Cai Liang,Cao Yuyang,Wang Chao,Qi Zeming,Song Li,Liu Xuguang,Sun Zhihu,Yan Wensheng
The development of two-dimensional (2D) magnetic semiconductors with room-temperature ferromagnetism is a significant challenge in materials science and is important for the development of next-generation spintronic devices. Herein, we demonstrate that a 2D semiconducting antiferromagnetic Cu-MOF can be endowed with intrinsic room-temperature ferromagnetic coupling using a ligand cleavage strategy to regulate the inner magnetic interaction within the Cu dimers. Using the element-selective X-ray magnetic circular dichroism (XMCD) technique, we provide unambiguous evidence for intrinsic ferromagnetism. Exhaustive structural characterizations confirm that the change of magnetic coupling is caused by the increased distance between Cu atoms within a Cu dimer. Theoretical calculations reveal that the ferromagnetic coupling is enhanced with the increased Cu-Cu distance, which depresses the hybridization between 3 d orbitals of nearest Cu atoms. Our work provides an effective avenue to design and fabricate MOF-based semiconducting room-temperature ferromagnetic materials and promotes their practical applications in next-generation spintronic devices.
研究领域:
材料科学
·
凝聚态物理
·
自旋电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2019
·Vol. 28
·期 3
·1668-1677
·
IF 1.476
Yuan Min,Zhao Yu,Niu Wenxing,Shi Qi,Xu Hong,Zheng Bin,Dong Jinxiang
In this study, three different zeolitic imidazolate framework (ZIF) materials of ZIF-8, ZIF-71, and MAF-6 were synthesized, and their tribological properties as base grease were evaluated. We demonstrate that the tribological properties of ZIFs are correlated with the framework density/pore volume and the substituted groups. Under 200 N, MAF-6 has the lowest wear volume value and ZIF-71 exhibits the lowest friction coefficient. As the load increased, MAF-6 maintained the best and most stable tribological performances among the three ZIFs additives; however, the properties of ZIF-71 worsened. Thus, MAF-6 exhibits the lowest density and largest solvent-accessible volume (SAV) and has the lowest elastic stiffness; it easily slides and adheres onto the wear surface, forming a tribofilm that reduces friction and prevents severe wear. ZIF-71 with chlorinated groups may enhance the tribological performance; as the load rises, its dense and stiff structure has an adverse effect. These results are expected to be helpful for designing future ZIFs with excellent lubrication properties.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 2
·1-8
·
IF 1.92
He Zhicai,Zhong Mingqiang,Yang Jintao
Aiming to prepare polystyrene microcellular foam with improved foam morphology and high thermal stability, ionic liquids which have been well demonstrated to possess high carbon dioxide (CO 2 ) absorption capacity were introduced into polystyrene by copolymerization of styrene and polymerizable ionic liquids, i.e., vinylbenzyl trimethyl ammonium fluoroborate ([VBTMA][BF 4 ]) and vinylbenzyl trimethyl ammonium hexafluorophosphate ([VBTMA][PF 6 ]), Abbr. ILs). These copolymers showed higher glass transition temperature (T g ) and high supercritical carbon dioxide (scCO 2 ) solubility, based on which foams with smaller cell size, higher cell density, and higher thermal stability were prepared by the microcellular foaming using scCO 2 as blowing agent. The morphology of the resultant foams highly depended on the foaming temperature, ionic liquid type and content. Compared to [VBTMA][BF 4 ]-St foam, [VBTMA][PF 6 ]-St have higher CO 2 absorption and glass-transition temperature, making it exhibit superior cell morphology. This work demonstrates that the introduction of ionic liquids can benefit the morphology control and thermal stability of polymeric foams and hopefully provides a promising method for the design and preparation of polymeric foams with high performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHROMATOGRAPHIA
·
2014
·Vol. 77
·期 23
·1705-1712
·
IF 1.37
Zhaoling Jiang,Lifang Zhang,Chong Zhang,Xiao Zhang,Feiqun Xue
Ultra high performance liquid chromatography with UV detection was developed and validated for the simultaneous determination of residues of toltrazuril and its two metabolites, namely, toltrazuril sulphone and toltrazuril sulphoxide, in edible tissues (chicken and porcine muscle, liver and kidney). Acetonitrile was used to extract analytes from tissues, which were then cleaned using primary secondary amine and Oasis™ MAX solid phase extraction cartridges. Chromatographic separation was performed on a C 18 column with gradient elution. The analytes were determined using a UV detector. The regression coefficients of matrix-matched calibration curves showed linearity of >0.99. Calibration ranged from 25 to 1,000 μg kg −1 for toltrazuril and toltrazuril sulphone, and 37.5–1,500 μg kg −1 for toltrazuril sulphoxide. The accuracy was between 80 and 110 %, and the inter and intraday RSDs were lower than 15.2 and 18.3 %, respectively. The limits of detection for toltrazuril, toltrazuril sulphone and toltrazuril sulphoxide were between 10 and 37.5 μg kg −1 in all the tissues. The developed method was successfully applied to detect toltrazuril, toltrazuril sulphone and toltrazuril sulphoxide in tissues of medicated chicken.
研究领域:
分析化学
·
兽医学
·
食品科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 1
·323-336
·
IF 2.478
Fan Jilei,Li Gang,Rajavel Krishnamoorthy,Zhu Pengli,Sun Rong,Wong Ching-Ping
Electrically conductive epoxy adhesive, which combines with Ag sintering materials rather than traditional Pb-based solder materials, attracts wide research interest in modern die attach technology for power electronic packaging owing to its advantages of low processing temperature and high working temperature. In this work, Cu foil and AgNO 3 were used as raw materials to synthesize dendritic silver nanostructure with a central trunk of 5–10 μm along with many primary branches of 200 nm. Subsequently, the sintering behavior of the obtained dendritic Ag nanostructures, as low-temperature interconnect material, was systematically investigated under different sintering conditions. Remarkably, the shear strength of the interconnect joints formed from dendritic Ag nanostructures could reach around 21 MPa after sintering for 30 min at 250 °C under a pressure of 10 MPa, whereas the shear strengths of the interconnect joints, which formed from Ag microspheres and microflakes under similar conditions, were only 9 MPa and 11 MPa. We think that the dramatic increment in the shear strength may result from the higher contact area of nanoscale primary branches of the synthesized dendritic structures than Ag microstructures and the low-temperature sintering of their nanoscale primary branches. In addition, the interconnect joint formed from dendritic Ag nanostructures also exhibited high reliability, and it still maintained a high shear strength of 27 ± 2 MPa even after 1000 cycles thermal quenching between − 55 and 125 °C. The thermal resistance and electrical conductivity of these interconnect joints were about 78.89 Wm −1 K −1 and 9.85 × 10 –6 Ω cm, respectively, which makes its further interconnect applications feasible. This means that the synthesized special dendritic Ag nanostructure has an excellent potential as a high-performance die attach material for high- and low-temperature power device.
研究领域:
材料科学
·
电子封装技术
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 29
·期 1
·72-79
·
IF 1.754
Wang Jianfeng,Zhou Jianping,Adelihan Kuqitaer,Shen Fenglei,Li Hua
Hollow SiO 2 spheres are synthesized by using various sizes of PS spheres as sacrified templates followed removal of the PS core by calcination. Large-area 2D monolayer SiO 2 hollow spheres opals are fabricated through gas–liquid–solid interface self-assembly route base on core–shell PS@SiO 2 as structural bricks which is a simple, fast and easily large-area-fabricated. In this route, proper ratio of alcohol to water plays important role on the synthesis of core–shell PS@SiO 2 composite spheres while,the hydrophobic treatment of core–shell PS@SiO 2 composite spheres is found primarily to realize opal films floating on water surface and further to be compacted into well ordered large monolayer films. Scanning electron microscopy and transmission electron microscopy demonstrate the obtained hollow SiO 2 spheres opals are well dispersed and well-ordered into two dimensional arrays. ultraviolet–visible–near infrared (UV–vis–NIR) spectroscopy shows that transmission in visible light range increases with the added size of hollow SiO 2 spheres. In contrast to solid SiO 2 spheres opal, hollow SiO 2 spheres opals demonstrates their improved transmission due to their high porosity.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）