JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 17
·7417-7431
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IF 3.553
Meng Xingtong,Jia Shuai,Mo Lanlan,Wei Jie,Wang Feijun,Shao Ziqiang
Nowadays, it has become a trend to prepare porous carbon as electrode materials for supercapacitors by using biomass and its derivatives by virtue of its low cost, abundant source and environmental friendliness. Carboxymethyl cellulose ammonium (CMC-NH 4 ), a kind of cellulose derivative, is used as a carbon precursor and O/N source to prepare carbon material through cross-linking with aluminum ions, lyophilization, carbonization and activation. The as-prepared O/N-co-doped carbon samples (ONAC-500, ONAC-600 and ONAC-700) exhibit hierarchically porous structure with different size pores in carbon framework, ensuring electrolyte ions effective transport and diffusion. Meanwhile, the ONAC-600 reveals a high specific surface area of 2658 m 2 g −1 , abundantly porous structure with pore volume of 1.32 cm 3 g −1 and effective O/N-doping, which ensure a high capacitance of 465.0 F g −1 at 1 A g −1 in 3 M KOH three-electrode system. It also shows better rate capability and good stability after 10000 cycled under 10 A g −1 . Besides, the assembled all-solid-state supercapacitor with ONAC-600 delivers an acceptable energy density of 7.8 Wh kg −1 at a power density of 124.2 W kg −1 .
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高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Benteng Sun,Zhangqian Liang,Yeye Qian,Xuesong Xu,Ye Han,Jian Tian
Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts exhibit sulfur vacancies, O-doping, more metallic 1T phase, and high electronic conductivity, thus leading to the exposure of more active edge sites, high Brunauer–Emmett–Teller surface area, enhanced visible light absorption, and improved electron separation and transfer, which are beneficial for photocatalytic nitrogen fixation. Consequently, the optimized 30 wt % SV-1T-MoS2-/CdS composites exhibit an outstanding nitrogen fixation rate of 8220.83 μmol L–1 h–1 g–1 and long-term stability under simulated solar light irradiation, significantly higher than pure CdS nanorods, CdS–Pt (0.1 wt %), and 30 wt % 1T-MoS2/CdS composites. The catalytic mechanism of photocatalytic nitrogen fixation on SV-1T-MoS2 is discussed by density functional theory calculations.
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高影响因子
ACS Applied Bio Materials
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2019
·
IF 0
Yanping Tong,Zhaochuang Wang,Yan Xiao,Wei Liu,Jinghao Pan,Yan Zhou,Meidong Lang
The emerging tide of hydrogels in biomedical fields drives them to possess good biocompatibility, tunable mechanical properties, and fast gelation process. Herein, a composite hydrogel containing copolypept(o)ides and functional polysaccharides was constructed through dynamic acylhydrazone linkages. First, a series of peptide–peptoid copolymers were synthesized by ring-opening polymerization of sarcosine (Sar) and l-glutamic acid γ-benzyl ester (BLG) N-carboxyanhydrides (NCAs). The benzyl groups of BLG units were substituted with hydrazide groups through ester–amide exchange aminolysis reaction. The statistical copolymer of poly(sarcosine-co-glutamate-hydrazide) (P(Sar-co-GH)) was chosen as an optimized precursor due to its excellent water solubility and gel-forming ability with aldehyde-modified sodium alginate (OSA). Moreover, cellulose nanocrystals (CNCs) were prepared as nanofillers to reinforce the P(Sar-co-GH)-OSA hydrogel. We demonstrated that the copolymer sequences and composition contents made a difference to the properties of the formed hydrogels by variation of the cross-linking density. The dynamic acylhydrazone bonds endowed hydrogels with pH responsiveness and reversible networks. The NIH/3T3 cells encapsulated in the hydrogels maintained high viability and proliferation abilities, indicating that the nanocomposite hydrogels could be explored to fabricate a customized responsive drug delivery system or cell scaffolds for tissue engineering.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hejia Sun,Hui Zheng,Qiming Tang,Yuman Dong,Fengmei Qu,Yaolei Wang,Guang Yang,Tao Meng
A simple process is developed for the one-step preparation of dual-compartment alginate microcapsules with controlled size and structure from microfluid-generated water-in-water-in-oil (W/W/O) emulsion droplet. Unlike other methods that rely on transient W/W/O emulsion droplet, we introduce an aqueous two-phase system (ATPS) to form a stable W/W/O emulsion droplet as a template for preparing dual-compartment alginate microcapsules. Two different bioactive molecules are able to be spatially confined encapsulated in the shell and core of alginate microcapsules due to the partitioning effect of ATPS and the high viscosity of alginate solution. Moreover, an enzyme cascade reaction with a spatial confined glucose oxidase and horseradish peroxidase in the shell and core of alginate microcapsules confirms its excellent biocompatibility and high activity. This method provides a green platform for enzyme-catalyzed tandem reactions and controlled sequential release of multiple drugs based on alginate microcapsules.
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高影响因子
FOOD HYDROCOLLOIDS
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2019
·
IF 5.839
Qi Li,Bing Xie,Yixiang Wang,Yanting Wang,Liangcai Peng,Yan Li,Bin Li,Shilin Liu
For high value utilization of energy crops, in this work, a high stable O/W Pickering emulsion had been prepared successfully by using cellulose nanofibrils (CNFs) obtained from Miscanthus floridulus straw (MFS). The effect of high pressure homogenization time on the physicochemical properties of the resulted CNFs had been investigated. The obtained CNFs had high surface activity and could spontaneously diffuse to the interface of the O/W phase. The particle adsorption kinetics of CNFs was characteristic of soft particles or Pickering emulsifiers, and the adsorption was irreversible. Therefore, stable oil-in-water Pickering emulsion was obtained by using the CNFs as particle emulsifiers, and the emulsion stabilized by CNFs with only 0.15 wt% exhibited outstanding stability. Moreover, the environmental factors, such as pH values, ionic strength, and temperature had little influence on the stability of the emulsion. All the results indicated that CNFs exhibited promising interfacial activity and powerful emulsifying ability. Owing to the flexible shape of the CNFs, it was concluded that MFS as a kind of energy crop was a promising source to obtain the CNFs for the fabrication of novel food-grade Pickering emulsions.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13458-13464
·
IF 3.049
Hao Guo,Mingyue Wang,Rui Xue,Jing Yao,Xuejiao Wang,Longwen Zhang,Jianfeng Liu,Wu Yang
A new COF (NWNU-COF-4) linked by an aryl ether bond (Ar–O–Ar) was synthesized by the condensation reaction of 2,4,6-trihydroxypyrimidine and trinitrophenol under simple and easy reaction conditions. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to characterize the product. The BET specific surface area of NWNU-COF-4 was 21.33 m2 g−1, and its pore size was about 1.351 nm. Additionally, this method of preparation was simple and cheap. The electrochemical measurements showed that the synthesized NWNU-COF-4 had excellent pseudocapacitive performance with maximum specific capacitance of 133.44 F g−1 at 0.3 A g−1 in 6 mol L−1 KOH electrolyte. When the current density increased by 10 times (3.0 A g−1), the specific capacitance was 114.12 F g−1, and the retention rate was 82%. After 10 000 GCD cycles, the capacitance still kept 94% of its initial capacitance.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Hemdan S. H. Mohamed,Liang Wu,Chao-Fan Li,Zhi-Yi Hu,Jing Liu,Zhao Deng,Li-Hua Chen,Yu Li,Bao-Lian Su
The development of lithium-ion batteries using transition metal oxides has recently become more attractive, due to their higher specific capacities, better rate capability, and high energy densities. Herein, the in situ growth of advanced mesoporous CuO/O-doped g-C3N4 nanospheres is carried out in a two step hydrothermal process at 180 °C and annealing in air at 300 °C. When used as an anode material, the CuO/O-doped g-C3N4 nanospheres achieve a high reversible discharge specific capacity of 738 mAhg–1 and a capacity retention of ∼75.3% after 100 cycles at a current density 100 mAg–1 compared with the pure CuO (412 mAhg–1, 47%) and O-doped g-C3N4 (66 mAhg–1, 53%). Even at high current density 1 Ag–1, they exhibit a reversible discharge specific capacity of 503 mAhg–1 and capacity retention ∼80% over 500 cycles. The excellent electrochemical performance of the CuO/O-doped g-C3N4 nanocomposite is attributed to the following factors: (I) the in situ growing CuO/O-doped g-C3N4 avoids CuO nanoparticle aggregation, leading to the improved lithium ion transfer and electrolyte penetration inside the CuO/O-doped g-C3N4 anode, thus promoting the utilization of CuO; (II) the porous structure provides efficient space for Li+ transfer during the insertion/extraction process to avoid large volume changes; (III) the O-doping g-C3N4 decreases its band gap, ensuring the increased electrical conductivity of CuO/O-doped g-C3N4; and (IV) the strong interaction between CuO and O-doped g-C3N4 ensures the stability of the structure during cycling.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 36
·20087-20094
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IF 2.936
Tingting Zhu,Ji Xiong,Zhongbo Xue,Yu Su,Fengnan Sun,Ran Chai,Jialiang Xu,Yaqing Feng,Shuxian Meng
Fluorescent probes have been demonstrated to be promising candidates as biomarkers and biological carriers. Our study focuses on the development of a novel amphiphilic fluorescent probe with good photostability, high water solubility, excellent specificity and promising loading capability for tumor diagnosis and treatment. At first, BODIPY dye and O-carboxymethyl chitosan were prepared via a chemical reaction. Then, the prepared BODIPY dye and cRGD were bonded to O-carboxymethyl chitosan successively via an acylation reaction. Finally, we obtained the desired amphiphilic fluorescent probe: BODIPY–O-CMC–cRGD, which was based on the fluorescence resonance energy transfer (FRET) principle for selective visualization of tumors in vitro. Through a series of experiments, we found that this fluorescent probe possessed better fluorescence characteristics and tumor targeting properties. Simultaneously, by self-assembly, the amphiphilic probe encapsulated the other flexible structure of BODIPY2 and the rigid structure of porphyrin, which formed distinct nanoparticles with different particle sizes. Hence, we could observe different phagocytosis processes of the two nanoparticles in the tumor cells via the fluorescence of dyes by confocal laser scanning microscopy. Therefore, the results suggest that the fluorescent probe has advantages in tumor detection, and the constructed tumor-specific nanoparticles show high clinical potential to be utilized not only in visual and precise diagnosis but also in excellent drug delivery for tumor treatment. Henceforth, we will prepare new targeted and visualized pharmaceuticals by replacing BODIPY2 and porphyrin with antineoplastic drugs for future tumor treatment.
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高影响因子
PLoS One
·
2018
·Vol. 13
·期 4
·e0194010
·
IF 2.766
Jin Zhao,Haixiong Xia,Tingyu Yu,Lu Jin,Xuehua Li,Yinghui Zhang,Liping Shu,Lingwen Zeng,Zhixu He
Vanillin (4-hydroxy-3-methoxybenzaldehyde), a food additive with rich milk flavor, is commonly used in the food, beverage and cosmetic industries. However, excessive consumption of vanillin may cause liver and kidney damage. Therefore, methods for detecting and controlling the level of vanillin in food, especially in infant powder, have important practical significance. In this study, we established a colorimetric assay for vanillin detection. The detection was performed under high-temperature and acidic conditions, which can induce the reaction of the aldehyde group of vanillin with the amino group of o-toluidine. The resulting product had a maximum absorption at 363 nm, which was quantified by a UV spectrophotometer. This assay had a limit of detection ( LOD ) of 1 pg mL −1 and a linear range between 1 μg mL −1 and 100 μg mL −1 . The average recoveries at three spiked levels were in the range from 91.1% to 101.6% with a relative standard deviation ( RSD ) of 4.62% ~ 7.27%.
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高影响因子
INTEGRATED FERROELECTRICS
·
2019
·
IF 0.486
Liping Zhou,Hao Hu,Yi-Xin Zhang,Qing-Ye Meng,Bing Yu,You-Qing Shen,Hai-Lin Cong
Dendrimers have become effective drug carriers and gene transfection vectors for medical biomaterials. In this experiment, UCNPs (NaGdF4:Tm, Yb@NaGdF4) and three-generation PAMAM dendrimers were prepared firstly; then NaGdF4:Tm, Yb@NaGdF4 was modified by Polyacrylic acid(PAA); PAMAM were grafted to the surface of the modified UCNPs by the reaction between amino groups and carboxyl groups; finally, O-nitrobenzaldehyde was grafted to the surface by Schiff base reaction.The synthesized upconversion materials were coated with PAA and PAMAM, then loaded with O-nitrobenzaldehyde to form spherical nanoparticles. The particle size of prepared nanoparticles is 75 ∼ 80 nm. The dendrimer complex can emit ultraviolet light to regulate the pH gradient of aqueous solution under the excitation of near-infrared light (980 nm), and can be used to kill cancer cells by changing the acidity of tissue cells; secondly, the cavity between dendrimers and dendrimers on the surface of the complex can be used in many fields such as drug delivery and gene transfection; the nanoparticles provide a new method for cancer treatment.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Hanqin Liang,Huilu Guo,Jinwei Yin,Kaihui Zuo,Yongfeng Xia,Dongxu Yao,Jian Zhang,Yuping Zeng,Shiwei Wang
Transparent AlON ceramics were bonded with Lu-Al-Si-O-N oxynitride glass interlayer at 1450 °C in nitrogen atmosphere in this investigation. The Lu-Al-Si-O-N oxynitride glass showed good wettability on the AlON substrate and had strong interface adhesion with each other. The joining process had no detrimental effect on the in-line transmittance of transparent AlON ceramics but caused slight decrease of flexural strength due to the partial decomposition. The bonding strength of AlON/AlON joint was 142.7 ± 6.3 MPa at room temperature and 110.1 ± 9.6 MPa at 1200 °C in situ, which were comparable with those of the parent AlON ceramics. Some Lu 2 Si 2 O 7 grains crystallized out from the glass interlayer after joining.
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高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Xingzhong Zhang,Yixiang Wang,Xiaogang Luo,Ang Lu,Yan Li,Bin Li,Shilin Liu
The increased quantities of fat in plants could allow the cells to inhibit the growth of ice and thus prevent the damages of their tissue structure in winter. In view of the structural buildup of freezing tolerance mechanism, here we presented a facile way of employing O/W Pickering emulsion as a template to produce the freestanding organo-hydrogels with increased mechanical stability and energy storage capacity. The oil droplets stabilized by cellulose nanofibrils were dispersed in the alginate polymer network that cross-linked with Ca2+, which resulted in homogeneous and closely packed microstructures. The prepared organo-hydrogels could maintain original gel structure under frozen conditions and had extraordinary mechanical performance. It could endure compressive stress up to 35 KPa (at 50% strain) and the elastic modulus was around 72 KPa, while the solid content of polysaccharides was only about 0.75%. By using our comprehensive strategy, organo-hydrogels with higher volumes of oil phase exhibited an enhanced cold storage capacity. For alginate hydrogel, it took 8 min when the temperature rose from 0 to 5 °C, while for the organo-hydrogel with oil volume of 30%, it took about 24 min. After 34 min, the inner temperature of alginate hydrogel was close to 25 °C, and about 70 min were needed for the temperature of organo-hydrogel to reach 25 °C. This kind of gel materials with complementary heteronetworks not only will have potential applications in cold chain logistics, but also can be applied in other fields with unusual functions.
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