CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·Vol. 40
·期 2
·320-325
·
IF 3.1
Zhu Tang Jiayao,Yuan Xiang,Mao Guojiang,Wei Lin,Xiao Lehui
Acid phosphatase (ACP) is a ubiquitous phosphatase in living organisms. The abnormal variation of ACP is related to various diseases. Herein, we propose a colorimetric method based on CeO 2 -modified gold core shell nanoparticles (Au@CeO 2 NPs) to analyze ACP activity with high sensitivity and specificity. In this design, 2-phospho- L -ascorbic acid trisodium salt (AAP) is dephosphorylated by ACP and produces reductive ascorbic acid (AA), which makes the CeO 2 shell decomposition. A remarkable blue shift of localized surface plasmon resonance peak (LSPR, from yellow to green) along with the scattering intensity ratio changes from individual Au@CeO 2 NPs are observed. ACP activity can be quantified by calculating the ratio changes of individual Au@CeO 2 NPs. This assay reveals limit of detection (LOD) of 0.044 mU/mL and the linear range of 0.05–5.0 mU/mL, which are much lower than most of spectroscopic measurements in bulk solution. Furthermore, the recovery measurements in real samples are satisfactory and the capacity for practical application is demonstrated. As a consequence, Au@CeO 2 NPs used in this assay will find new applications for the ultrasensitive detection of enzyme activity.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 105
·期 3
·827-835
·
IF 2.606
Jiao Yifei,Ye Gaolin,Sun Jinxing,Yu Wanjun,Gong Feng,Zhou Peng,Bai Jiaming,Yan Ming,Liu Gang
Stereolithography-based additive manufacturing (AM) makes it possible to realize high-quality ceramic parts with various shapes. However, preparation of ceramic slurry with high solid loading, low viscosity, long-term stability, and desirable cure depth for stereolithography is still challenging. In this paper, research is carried out for revealing the effects of dispersant, solid loading, and mixing method on the stability and viscosity of the slurry. Under optimized conditions, a highly stable yttria-stabilized zirconia ceramic slurry with high solid loading (45 vol.%) was prepared by grinding with a three-roller mill. With layer thickness of 30 μm and exposure dose of 10 mJ/cm 2 (10 mW/cm 2 for 1 s), ceramic green bodies with complex shape were successfully fabricated. After sintering, the final ceramic parts showed well-defined shapes with high level of densification. Graphical
In this work, 3Y-TZP ceramic slurry was successfully prepared by the modified powders via dispersant and grinding and dispersing with a three-roller mill. Finally, ceramic parts with complex shape and excellent performance were achieved.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 17
·5729-5738
·
IF 2.371
Sun Shao-Xing,Xie Rui,Wang Xiao-Xue,Wen Guo-Qing,Liu Zhuang,Wang Wei,Ju Xiao-Jie,Chu Liang-Yin
Compared to phase-change fibers with hydrophilic polymer shell, those with hydrophobic polymer are more stable in water and moist environments. However, their fabrication processes are involved in some toxic organic solvents. Here, the nanofibers with phase-change material (PCM, i.e., octadecane) as core and hydrophobic shell (i.e., polyvinyl butyral) are fabricated via coaxial electrospinning using environmental friendly ethanol as solvent. Effects of the polyvinyl butyral concentration in ethanol solution as well as the flow rates of core and shell fluids on the morphology of octadecane/polyvinyl butyral (PCM/PVB) nanofibers are systematically investigated. The thermo-regulating capability of PCM/PVB nanofibers is demonstrated by observing the surface and inner temperatures of model houses covered with fibers. The higher the PVB concentration and the shell flow rate are, the better the morphology of core/shell PCM/PVB nanofibers becomes, leading to higher encapsulation efficiency. At a constant shell flow rate, the encapsulation ratio of PCM/PVB nanofibers increases with the core flow rate. The encapsulation ratio of the PCM/PVB nanofibers, which fabricated with PVB concentration of 20 % (w/v) and at the core flow rate of 0.60 ml h −1 and the shell flow rate of 3.0 ml h −1 , respectively, reaches to the maximum of 46.4 %. The corresponding melting enthalpy (Δ H
m ) and the crystallization enthalpy (Δ H
c ) of these PCM/PVB nanofibers are 105.9 and 106.5 J g −1 , respectively. The PCM/PVB nanofibers exhibit good thermo-regulating capability under the simulated solar irradiation, regulating the temperature at around 28 °C. The resultant PCM/PVB nanofibers exhibit satisfactory stability and repeatability in the thermo-regulating capability during repeated heating/cooling cycles. The results provide valuable guidance for environmental friendly preparation of phase-change nanofibers with satisfactory and stable thermal characteristics.
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高影响因子
Frontiers of Physics
·
2022
·Vol. 18
·期 1
·1-10
·
IF 5.142
Xu Meng,Guo Lei,Chen Lei,Zhang Ying,Li Shuang-Shuang,Zhao Weiyao,Wang Xiaolin,Dong Shuai,Zheng Ren-Kui
Weak antilocalization (WAL) effect is commonly observed in low-dimensional systems, three-dimensional (3D) topological insulators and semimetals. Here, we report the growth of high-quality Ta 0.7 Nb 0.3 Sb 2 single crystals via the chemical vapor transport (CVT). Clear sign of the WAL effect is observed below 50 K, probably due to the strong spin—orbital coupling in 3D bulk. In addition, it is worth noting that a relatively large MR of 120% appears under 1 T magnetic field at T = 2 K. Hall measurements and two-band model fitting results reveal high carrier mobility (>1000 cm 2 · V −1 ·s− 1 in 2–300 K region), and off-compensation electron/hole ratio of ∼8:1. Due to the angular dependence of the WAL effect and the fermiology of the Ta 0.7 Nb 0.3 Sb 2 crystals, interesting magnetic-field-induced changes of the symmetry of the anisotropic magnetoresistance (MR) from two-fold (≤ 0.6 T) to four-fold (0.8–1.5 T) and finally to two-fold (≥ 2 T) are observed. This phenomenon is attributed to the mechanism shift from the low-field WAL dominated MR to WAL and fermiology co-dominated MR and finally to high-field fermiology dominated MR. All these signs indicate that Ta 0.7 Nb 0.3 Sb 2 may be a topological semimetal candidate, and these magnetotransport properties may attract more theoretical and experimental exploration of the (Ta,Nb)Sb 2 family.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 23
·10350-10360
·
IF 2.302
Yu Runhui,Li Yan,Tao Furong,Cui Yuezhi,Song Weiqiang,Li Tianduo
Conjugated polymer P, which was synthesized by introducing 9,9-diphenylfluorene and thiophene units into the backbone of poly(fluorenylene ethynylene), showed high sensitivity in detecting nitroaromatics. A double-layer sensor, named P-PS/GEL, was prepared by electrospinning technique using polymer P, polystyrene (PS), and gelatin (GEL). A nanofibrous membrane from the mixture of PS and P as the top layer (P-PS) served as the sensing layer for detecting nitroaromatics (NACs). A gelatin nanofibrous membrane as the bottom layer (GEL) served as porous scaffold for the top layer. Therefore, apart from transferring into the top layer directly from above, the NACs molecules could also approach the top sensing layer through the bottom porous layer. This double-layer conformation greatly improved the permeability of the P-PS layer. As a result, the double-layer sensor exhibited a greater quenching efficiency ( Q
f ) of 75 % than that of the single-layer P-PS (55 %). Importantly, the sensor showed good reversibility of quenching process after being exposed to saturated DNT vapor for 6 cycles.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 11
·10956-10965
·
IF 2.8
Ye Nan,Wang Zhuang,Wang Se,Fang Hao,Wang Degao
Graphene-family nanomaterials (GFNs) exhibit universal applications and consequently will inevitably enter aquatic systems. However, both the fate and behavior of GFNs in aquatic environments have not been completely explored at field relevant conditions. Herein, we have systematically investigated the aqueous aggregation and stability of graphene nanoplatelets (GNPs), graphene oxide (GO), and reduced graphene oxide (RGO) under varied solution chemistry parameters (pH, divalent cations, and dissolved organic carbon (DOC)) during 21 days of incubation in simulated natural environmental conditions. Results indicate that pH values from 6 to 9 had a notable impact on the aqueous behaviors of the three GFNs. Divalent cations (Ca 2+ and Mg 2+ ) at the concentrations of 2.5 and 10 mM remarkably increased the extent of aggregation of the three GFNs and resulted in severe sedimentation, independently of surface chemical functionalization. The presence of only DOC ranging from 0.5 to 2 mg C/L significantly elevated the dispersion stability of GNPs and RGO in a dose-dependent manner, whereas no effects were observed on GO. Furthermore, DOC at the studied concentrations and surface functionality were insufficient to counterbalance the impact of the divalent cations. Direct visual and in situ observations further supported the conclusions on the effects of divalent cations or/and DOC. These findings further underline that the environmental behaviors of GFNs are controlled by the complex interplay between water chemistry parameters and GFN surface properties.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12026-12040
·
IF 2.22
Mao Min,Xu Jing,Li Jingjiao,Zhao Sheng,Li Xuanhao
It was the constant pursuit of researchers to explore catalysts with higher catalytic activity, and the use of co-catalysts to modify the performance of photocatalytic materials had a significant effect on charge separation. In this paper, the non-precious metal NiS-modified ZnCo 2 O 4 composite catalytic material prepared by hydrothermal method had high-efficiency catalytic performance. When the weight ratio of NiS to ZnCo 2 O 4 was 12%, the optimal catalytic activity is 3.57 mmol g −1 h −1 , which was more than twice that of ZnCo 2 O 4 . The presence of NiS not only improved the specific surface area of the catalyst and its ability to respond to light, but the close interface formed by the combination of the two monomer phases accelerated the transfer and the utilization of the photocharge on ZnCo 2 O 4 to NiS, thereby promoting the separation of electron holes and improving the photocatalytic activity of the catalyst. According to the research results, the mechanism of hydrogen production in the photocatalytic system was revealed. In this paper, NiS was used to modify the bimetallic oxide with cubic appearance, which provided a new strategy for the development of new photocatalysts.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 4
·1856-1867
·
IF 2.302
Cao Weiwei,Peng Xuefeng,Chen Xiaoqin,Wang Xi,Jin Feng,Li Qiang,Chen Huinan,Jiang Chao,Ye Zhiwen,Xing Xiaodong
In this work, a cationic polymer, N-alkylated poly (4-vinylpyridine) was applied for the surface functionalization of nanodiamond (ND). The facile route not only settled the problems of agglomeration and poor dispersion stability of ND but also rendered the nanomaterial antibacterial property. Chemical modification of the particles was confirmed by FT-IR spectroscopy and 1 HNMR, and the cationic polymer contents were determined by TGA studies. The particle diameters and dispersity of functionalized NDs were investigated by TEM and DLS measurements. It was found that extremely tight core aggregates (100–200 nm) were broken into tiny nanoparticles (20–30 nm) through functionalization with NPVP-propyl or NPVP-hexyl, which gave stable and homogeneous functionalized ND particles in colloidal solution. The antibacterial tests against Gram-positive Staphylococcus aureus ( S. aureus ) and Gram-negative Escherichia coli ( E. coli ) showed that the cationic polymer-modified ND exerted certain antibacterial activity. The FE-SEM images indicated that NPVP-hexyl-ND particles were attached to the cell wall surface of E. coli , which subsequently led to the formation of nanoscale holes on cell membrane and eventually the serious destruction of cell wall. We suspected that the interaction of NPVP-hexyl-ND with bacteria may come from the electrostatic interactions, the intermolecular and surface forces between functionalized nanoparticles and cell membranes, which may damage the outer membranes of bacteria and result in cell death.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 36
·14440-14451
·
IF 4.5
Zhou Yuncheng,Xu Yuxing,Feng Hailan,Song Jiechen,Yan Mengxiao,Jian Haoyu,Zhuge Fuchang,Tan Qiangqiang
The Li-excess disordered rock salt cathode material, Li 1.2 Ni 0.2 Ti 0.6 O 2 , was synthesized via the sol–gel method to investigate the impact of different sintering temperatures on its structure, morphology, and electrochemical performance. X-ray diffraction (XRD) analysis revealed a cubic rock salt structure for the material. Raman spectroscopy indicated the presence of short-range-ordered domains of Li 2 TiO 3 and LiNiO 2 in the samples. The XPS results confirmed the existence of an oxygen vacancy structure on the sample’s surface. Morphological observations demonstrated that micron-scale secondary particles agglomerated with nanoscale primary particles, resulting in a nano-microstructure formation. Electrochemical testing conducted at room temperature within a voltage range of 1.5 ~ 4.8 V showed that the sample sintered at 600 °C exhibited the highest specific discharge capacity of approximately 304.4 mAh g −1 at 20 mA g −1 . The influence of surface structure on electrochemical properties in disordered rock salt cathode materials is elucidated through interactions between small primary particles and surface oxygen vacancies.
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高影响因子
FIBERS AND POLYMERS
·
2017
·Vol. 17
·期 12
·2153-2161
·
IF 1.113
Wu Lingyan,Lu Shaorong,Pan Lulu,Luo Qiyun,Yang Jin,Hou Linglan,Li Yuqi,Yu Jinhong
Polypropylene composites were prepared by melt compounding method with hyperbranched polyester grafted sisal microcrystalline and CaCO 3 . The thermal and mechanical properties of polypropylene composites were investigated by means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), melt flow indexer (MFI), dynamic mechanical analysis (DMA) and mechanical tests. It was found that the thermal and mechanical properties of PP composites were greatly improved by incorporating MCC-g-HPG-SA. For example, the impact strength, flexural strength, and toughness of the composites with 4 wt% MCC-g-HPG-SA loading were 64.71 kJ/m 2 , 42.72 MPa, and 2186.69 J/m 3 , significantly increased by 238.3 %, 18.4 % and 1843.9 % respectively, as compared with PP/MCC/CaCO 3 composites. In addition, thermal stability of PP/MCCg-HPG-SA/CaCO 3 composites also showed an obvious enhancement compared with PP/MCC/CaCO 3 composites.
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高影响因子
JOM
·
2023
·Vol. 75
·期 3
·701-707
·
IF 2.6
Yao Qiang,Guo Jing,Guan Fucheng,Zhao Miao,Zhang Sen,Tuo Xiaohang,Yang Qiang
As a transition metal dichalcogenides (TMDCs), molybdenum disulfide (MoS 2 ) comprises individual sheets stacked into a bulk-phase structure. Compared with bulk-phase MoS 2 , the few-layer MoS 2 presents a two-dimensional nanostructure similar to graphene, which has the advantages of large specific surface area and many unsaturated vacancies in the edge layer and has broad application prospects in the fields of photoelectricity and catalysis. Here, a simple and practical method of exfoliating bulk-phase MoS 2 is proposed. The bulk-phase MoS 2 was sonicated using chitosan/acetic acid (CS/HAc) solution to obtain oligomeric MoS 2 . The raw materials used in this method have good biocompatibility, the preparation process and operation are simple, and the pollution caused to the environment is small, which meets the green chemical standard. The method provides a new idea and way for the peeling treatment of other laminated materials. The results show that the stacking of (002) crystal plane of MoS 2 samples after treatment with CS/HAc solution is reduced and the crystalline phase is changed from polycrystalline to single-crystal structure, which has great potential for applications in optical and electrical fields.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 15
·22560-22575
·
IF 0
Kong Yanli,Guo Meng,Lu Fan,Huang Aihua,Nie Yong,Ma Jiangya
Conventional inorganic coagulants (Al, Fe) and Al/Fe-based covalently bonded flocculants (CAFMs) had different hydrolysis species at different pHs, which subsequently led to differences in their binding sites and complexation ability with humic acid (HA). Studying the binding sites and interactions between CAFMs, AlCl 3 (Al), and FeCl 3 (Fe) hydrolysates and HA molecules is critical to understanding the coagulation mechanism. The results found that CAFM 0.6 , Al, and AlCl 3 combined FeCl 3 (Al/Fe) removed more than 90% of HA at pH 6, and CAFMs showed higher HA removal rate than that of Al, Fe, and Al/Fe under the same reaction conditions. The flocs of CAFMs contained abundant -NH 2 /OH as well as the large particle size, compact structure, and excellent settling performance. The hydrolyzed species of Al and Fe were predominantly Al b and Fe b at pH 6, but the hydrolyzed species of CAFMs were primarily (Al + Fe) c . Moreover, the hydrolyzed species of Al and Al/Fe were found to complex with HA functional groups such as -COOH, C = O, C-H/C–C, C = C, and C–OH to form ligand bonds, while the hydrolyzed species (Al + Fe) c of CAFMs could deeply interact with HA functional groups including C-O, -COOH, C = O, C-H/C–C, C = C, and C–OH by the adsorption and sweeping.
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