Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-17
·
IF 12.264
Ding Chenfeng,Liu Tianyi,Yan Xiaodong,Huang Lingbo,Ryu Seungkon,Lan Jinle,Yu Yunhua,Zhong Wei-Hong,Yang Xiaoping
An ultra-microporous carbon material simultaneously with high specific surface area (1554 m 2 g −1 ) and packing density (1.18 g cm −3 ) is designed and fabricated.
The resulting carbon material integrates the high gravimetric and volumetric capacitance (430 F g −1 and 507 F cm −3 at 0.5 A g −1 ) and thereof provides the robust all-solid-state cellulose supercapacitor with high areal and volumetric density.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-12
·
IF 2.426
Chen Yang,Jiang Lanying
In this research, an attempt has been made to prepare a membrane with high adsorption capacity and high separation efficiency for oil water. The composite membrane of UiO-66-NH 2 and polyacrylonitrile (PAN) were fabricated by electrospinning, and hydrophobic modification was carried out to obtain the oil selectivity. UiO-66-NH 2 loaded on fibers significantly enhanced the oil affinity and surface roughness of the composite membrane. The composite membrane was used for colleseed oil, kerosene, methylbenzene, methyl silicone oil and dichloromethane adsorption, and the maximum adsorption capacity were 31.5, 21.9, 19.9, 39.9, 39.7 g·g −1 , respectively, which was 32–96% higher than pure PAN adsorbent. The amount of UiO-66-NH 2 loaded on fibers accelerated the diffusion of oil in membrane and reduced the adsorption time to reach equilibrium. The adsorption process can be well described by pseudo-second-order and intra-particle diffusion model. The composite membrane also showed potential reusability. In addition, the composite membrane has excellent performance in oil/water separation, and the oil can be separated from mixture solution just under gravity. The oil flux is 2286 Lm −2 h −1 and remains 1568 Lm −2 h −1 after ten times continuous filtration. Overall, the composite PAN-MOFs-coated membrane has promising potential in practical application in oil/water separation.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 11
·4342-4349
·
IF 1.941
Zhou Man,Zhai Shixiong,Song Tiantian,Zhao Hong,Fan Zhuizhui,Ge Fengyan,Zhao Yaping,Xu Bi,Cai Zaisheng
The acrylic adhesives with the flame-retardant property are necessary to meet the safety requirement in electrostatic flocking. In this study, acrylic emulsion chemically modified with phosphorus and silicone, PSE, with core–shell structure, was synthesized by introducing the vinyl silicone oil and phosphor-containing monomer (PAM-100) onto the molecular chain of acrylic ester polymer in the core and shell layer, respectively. Subsequently, the silicone-acrylic adhesive with flame retardation (FR-SA) was prepared by mixing PSE with inorganic flame-retardant, Al(OH) 3 . The acrylic adhesive obtains the excellent flame retardation under a low addition of Al(OH) 3 when the ratio of PAM-100 is 5%, while the commercial adhesive needs a high addition of the inorganic flame retardant to realize the satisfactory performance. FR-SA in this work has a great potential application as intrinsically flame-retardant electrostatic flocking adhesive.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-8
·
IF 6.232
Liu Yaqing,Lin Xiaodong,Ji Xiangyi,Hao Zhe,Tao Zhanhui
A novel fluorescence strategy based on the outstanding catalytic capability of CuS nanoparticles (CuS NPs ) has been developed for highly sensitive and specific determination of o,o-dimethyl-o-2,2-dichlorovinyl phosphate (DDVP) under enzyme-free and hydrogen peroxide (H 2 O 2 )-free conditions. In the presence of DDVP, CuS NPs can catalyze non-fluorescence substratum of Amplex red (AR) into resorufin, which exhibits fluorescence emission at 584 nm under excitation at 540 nm. The sensing system exhibits outstanding specificity and only responds to DDVP and no other organophosphorus pesticides (OPs). A wide linear range is obtained from 0.0001 to 0.1 μg/mL, and the limit of detection (LOD) is 0.1 ng/mL. Furthermore, paper-based test strips have been constructed for visual detection of DDVP under ultraviolet light irradiation. By integrating a smartphone installed with Color Picker APP, point-of-care detection with quantitative determination is realized, demonstrating substantial potential applications of the as-developed assay for in situ detection.
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2020
·Vol. 246
·期 10
·1909-1918
·
IF 2.366
Zhang Xiao-Hua,Ma Yi-Xin,Yi Chong,Qing Xiang-Dong,Liu Zhi,Zheng Jing-Jing,Lin Fang,Lv Tian-Feng
In this paper, the application of chemometrics coupled with high-performance liquid chromatography-diode array detection (HPLC–DAD) for the rapid and sensitive quantitative analysis of seven flavonoids in the raw and purified propolis samples was investigated. The objective of this paper was to receive a successful resolution of the complex propolis matrix with minimum experimental time (3.5 min) when appearing unknown interferences, highly overlapping peaks, time and baseline drifts among chromatograms. First, the validation samples contained seven flavonoids at five levels, helped to understand and interpret the features of the second-order calibration method based on the alternating trilinear decomposition (ATLD) algorithm. Second, the experimental data were studied for the simultaneous determination of flavonoids in the raw and purified propolis samples using the function of "mathematical separation" of ATLD algorithm. Except for myricetin (MY), the average recoveries of other analytes were 95.79–105.82% for the raw propolis samples, 94.41–108.06% for the purified propolis samples. In addition, the limit of detection (LOD, 0.01–0.20 μg mL −1 ), limit of quantification (LOQ, 0.03–0.60 μg mL −1 ), sensitivity (SEN, 15.97–184.31 mL μg −1 ), selectivity (SEL, 0.16–0.76) and root-mean-squared error of prediction (RMSEP, 0.29–1.64 μg mL −1 ) of the proposed method, demonstrated that all the target analytes have good sensitivity, low detection limit. According to the experimental results, the total content of flavonoids in purified propolis is about twice that in raw propolis, which is consistent with the actual situation. This analytical strategy will be extremely promising for the identification and quantification of analytes studied in the complex samples.
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2020
·Vol. 46
·期 9
·4297-4309
·
IF 2.262
Xie Jun,Zhang Jinhui,Zhang Xueke,Guo Ziyang,Hu Yun
Inspired by the strong adhesion of mussels, a super-hydrophobic sponge was designed and prepared by a simple and inexpensive one-pot solution immersion method. The prepared superhydrophobic sponge can not only efficiently separate the oil–water mixture, more importantly, but also remove volatile organic compounds in the atmospheric environment. Polydopamine (PDA) enables polydivinylbenzene (PDVB) particles to be firmly and tightly attached to the melamine sponge skeleton, thereby making the hydrophilic sponge superhydrophobic and providing adsorption sites for volatile organic compounds in the air. The synergy enables the sponge/PDA/PDVB to quickly adsorb oils and organic substances, and it has high stability and capacity even after 20 cycles. In addition, superhydrophobic sponges can still perform outstanding adsorption performance even under highly acidic and alkaline environments. Meanwhile, the static adsorption capacity of the sponge/PDA/PDVB for gaseous toluene is 5.7 times that of activated carbon. Compared with pure PDVB, the super-hydrophobic sponge in the dynamic experiment has a penetration time increased from 6 to 390 min, which is 65 times longer than that of the PDVB, and the adsorption performance has been greatly improved. Therefore, our strategy may achieve a new effect, which can quickly and easily separate oil–water mixtures and remove volatile gaseous pollutants, and it can provide potential options for practical applications
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7475-7488
·
IF 4.21
Song Quancheng,Zhan Zeying,Chen Binxia,Zhou Zehang,Lu Canhui
Polypyrrole (PPy) has received extensive attention in supercapacitor electrodes due to its promising electrochemical activity, while the poor cycling stability and densely packed structure limited its electrochemical performance. Herein, we demonstrate the fabrication of flexible and freestanding PPy@bacterial cellulose (BC)/MXene composite film with significantly enhanced electrochemical performance. PPy nanoparticles were uniformly deposited on BC nanofibers via in situ polymerization, and assembled with highly conductive MXene (Ti 3 C 2 T x ) nanoflakes through strong interfacial interactions. BC as a biological template can effectively disperse PPy nanoparticles. The intercalation of PPy@BC nanofibers into Ti 3 C 2 T x layers constructs hierarchically packed nanofibrous structure, which provides extensive accessible electrochemical active sites. Freestanding PPy@BC/Ti 3 C 2 T x (PBM) electrode exhibits superior specific capacitance (gravimetric and areal capacitance of up to 550 F g −1 and 879 mF cm −2 , respectively) and excellent capacitance retention of 83.5% after 10,000 cycles. In addition, the symmetric supercapacitor assembled by PBM papers present a high energy density of 33.1 W h kg −1 (power density of 243 W kg −1 ) and excellent capacitance retention. The elaborately designed nanostructure and PPy-Ti 3 C 2 T x hybridization make great contribution to the enhanced electrochemical performance, which provide a feasible method for the fabrication of conductive polymer-based high-performance flexible supercapacitor electrodes. Graphic abstract
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Mei Lin,Xu Zhenlong,Shi Yanmei,Lin Chunlei,Jiao Shuyan,Zhang Lijun,Li Pengxu
Chitosan oligosaccharide functionalized silver nanoparticles with synergistic bacterial activity were constructed as a multivalent inhibitor of bacteria. Placing the chitosan oligosaccharide on silver nanoparticles can dramatically enhance the adsorption to the bacterial membrane via multivalent binding. The multicomponent nanostructures can cooperate synergistically against gram-positive and gram-negative bacteria. The antibacterial activity was increased via orthogonal array design to optimize the synthesis condition. The synergistic bacterial activity was confirmed by fractional inhibitory concentration and zone of inhibition test. Through studies of antimicrobial action mechanism, it was found that the nanocomposites interacted with the bacteria by binding to Mg 2+ ions of the bacterial surface. Then, the nanocomposites disrupted bacterial membrane by increasing the permeability of the outer membrane, resulting in leakage of cytoplasm. This strategy of chitosan oligosaccharide modification can increase the antibacterial activity of silver nanoparticles and accelerate wound healing at the same time. The nanomaterial without cytotoxicity has promising applications in bacteria-infected wound healing therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Chemistry Letters
·
2020
·Vol. 18
·期 4
·1441-1446
·
IF 5.922
Zhao Xudong,Chen Zhiguo,Che Mingda,Qiu Sha,Huang Renliang,Qi Wei,He Zhimin,Su Rongxin
Pollution of waters by chlorinated organic pollutants is difficult to clean using actual remediation methods because these pollutants are highly stable. For instance, chloroform (CHCl 3 ) is poorly reactive with common oxidants such as iron-activated persulfate, ozone and Fenton’s reagents. Therefore, there is a need to develop new oxidants. Here, we designed a new dechlorination system, in which tannic acid and NaOH work synergistically to activate persulfate. We tested the effect of temperature and concentrations of persulfate, NaOH and tannic acid, on chloroform removal from water. Free radical-quenching experiments were performed to identify active species. Results show that chloroform removal increased from 42.5 to 97.6 wt.% after the addition of 300 mg/L tannic acid in 0.4 M NaOH. Superoxide radicals (O
·− 2
) was primarily responsible for the degradation of chloroform in the persulfate/NaOH/tannic acid system, in which tannic acid reacts with persulfate to produce hydroperoxide. Hydroperoxide then reduces persulfate to generate sulfate radicals (SO 4 ·− ), and produces O
·− 2
. NaOH-activated persulfate produces hydroxyl radicals (HO · ), which can oxidize chloroform. This dechlorination system showed excellent degradation efficiency for recalcitrant halogenated compounds, making it a very promising candidate for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
AAPS PHARMSCITECH
·
2020
·Vol. 21
·期 4
·1-13
·
IF 2.401
Lan Hairong,Liu Huijun,Ye Yalin,Yin Zongning
This study aimed to investigate the effect of pH-mediated surface properties of bovine serum albumin (BSA) on protein aggregation and the changes of protein structure and colloidal stability at different solution pH levels. The hydrophobicity of BSA surface was characterized by endogenous fluorescence spectroscopy, fluorescence quenching of acrylamide, and fluorescence probe. The results showed that the hydrophobicity of BSA surface was similar at pH 5, 6, 7.4, followed by pH 4, 8, 9, 10, and finally by pH 3 and 11 with strong acidity and alkalinity. The positive charge on the BSA surface was increased gradually with the decrease of solution pH, while the negative charge on protein surface was increased gradually with the increase of solution pH. The degree of protein aggregation was examined by turbidimetry, flow cytometry, and SDS-PAGE. The results showed that the oscillating aggregation of BSA did not change with the solution pH, but was partially dependent on the relative contribution of electrostatic and hydrophobic interactions between the protein molecules. In addition, the secondary structure, conformational stability, unfolding degree, and colloidal stability of proteins were investigated by circular dichroism, fluorescence spectroscopy, protein pulse hydrolysis, and dynamic light scattering, respectively. The results suggested that the solution pH could change the structure and stability of the protein at different levels. Solution pH has distinct effects on the structural stability of protein at different levels. The change of protein surface properties mediated by solution pH is related to protein aggregation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2020
·Vol. 13
·期 5
·1389-1398
·
IF 8.183
Zhang Li,Yang Zhe,Ren Jinghua,Ba Li,He Wenshan,Wong Chun-Yuen
The combination of photodynamic therapy (PDT) and photothermal therapy (PTT) has attracted much interest in recent years, but non-specific distribution of photosensitizers and intrinsic tumor hypoxic microenvironment have continued to limit its therapeutic efficiency. We herein report a nano-theranostic system, denoted as Ce6-CuS/MSN@PDA@MnO 2 -FA NPs, which combines PDT, PTT, magnetic resonance (MR) imaging with hypoxia-relieving and tumor-targeting functionalities. Central to this design is the use of mussel-inspired polydopamine (PDA) coating to encapsulate the chlorin e6 (Ce6) and copper sulfide nanoparticles (CuS NPs) loaded mesoporous silica nanoparticle (MSN) core. The PDA coating not only acts as pH sensitive gatekeeper to prevent the premature release of Ce6 under non-acidic tumor microenvironment (TME), but also facilitates post-functionalization so that hypoxia-relieving MnO 2 nano-sheets and tumor-targeting ligand folic acid-PEG-thiol (FA-PEG-SH) can be decorated on the outer part of the drug system. In vitro and in vivo measurements clearly demonstrated that all these functionalities worked synergistically as expected. The system, having a low dark cytotoxicity, can be effectively internalized by 4T1 cells and decrease the cell viability to 2% upon 660 nm/808 nm laser irradiation. Tumors in 4T1 tumor-bearing mice can almost be completely destroyed in 2 weeks via combined PDT/PTT. Together with the TME-sensitive MR imaging performance demonstrated, Ce6-CuS/MSN@PDA@MnO 2 -FA NPs represent a multifunctional prototype which holds great potential to be developed into clinical theranostics.
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 3
·1279-1285
·
IF 2.054
Xia Yang,Zhao Jinlong,Dong Zhaowang,Guo Xueyi,Tian Qinghua,Liu Yong
Cobalt-chrome-molybdenum (Co-Cr-Mo) alloy possesses outstanding strength, wear, and corrosion resistance and is a good material candidate for making dental and orthopedic implants. Spherical Co-Cr-Mo powder for additive manufacturing is usually costly due to the high-temperature melting processes and low yield of the powder with desirable particle size in the conventional melt-atomization process. A novel process for making spherical Co-Cr-Mo alloy powder through a simple meltless granulation and sintering process is described herein. The results indicate that the compositional segregation problem can be overcome and high-temperature operation avoided. Segregation-free powder was obtained after sintering above 1200°C. The powder was purified during sintering in a hydrogen atmosphere. The hydrogen purification mechanism is discussed with the aid of thermodynamic modeling using HSC Chemistry software. The oxygen content in the final powder can be controlled to < 0.2 wt.% for powder with particle size < 107 µ m. The final powder retained good spherical morphology.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）