NPG Asia Materials
·
2023
·Vol. 15
·期 1
·1-8
·
IF 9.7
Dong Yangbo,Feng Danyang,Li Wei,Zhang Rui,Dou Shuzhen,Wang Luoqi,Yang Yan,Wang Li,Yang Yang,Wei Feng,Qiao Zhen-An
Gradient porous structures enable the fast capillary-directed mass transport and enhance the chemical reaction rate with optimal efficiency and minimal energy consumption. Rational design and facile synthesis of functional mesoporous materials with sheet structure and gradient mesopores still face challenges of stacked structures and unadjustable pore sizes. Herein, an interfacial co-assembly strategy for gradient mesoporous hollow silica sheets is reported. The modulated oil-water interface allows the assembly of gradient mesoporous silica layers on the water-removable ammonium sulfate crystals. The obtained mesoporous silica layers possess narrow pore size distributions (~2.2 nm and ~6.6 nm). Owing to the good mono-dispersity, sheet structure and proper pore size, the designed gradient mesoporous hollow silica sheets can serve as flexible building blocks for fabricating nanoscale molecule filtration device. Experiments reveal that the obtained nanofiltration device shows remarkable gradient rejection rates (range from 23.5 to 99.9%) for molecules with different sizes (range from 1.2 to 4.4 nm).
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Zhongyan,Ren Chunhua,Shang Yuna,Yang Cuihong,Guo Qingxiang,Chu Liping,Liu Jianfeng
The utilization of nanotechnology to deliver vaccines and modulate immunity has shown great potential in cancer therapy. Peptide-based supramolecular hydrogels as novel vaccine adjuvants have been found to effectively improve the immune response and tumor curative effect. In this study, we designed a set of reduction-responsive self-assembled peptide precursors (Fbp-GDFDFDYD(E, S, or K)-ss-ERGD), which can be reduced by glutathione (GSH) into Fbp-GDFDFDYD(E, S or K)-SH for forming of hydrogel with different surface properties (E-gel, S-gel, and K-gel, respectively). Using the same method, co-assembled hydrogel vaccines (E-vac, S-vac, and K-vac, respectively) can also be prepared by mixing different precursors with antigens before GSH reduction. Through TEM observation of the nanostructure, we found that all the co-assembled hydrogels, especially K-vac, possessed much denser and more unified nanofiber networks as compared with antigen-free hydrogels, which were very suitable for antigen storage and vaccine delivery. Although the three peptides adopted similar β-sheet secondary structures, the mechanical properties of their resulted co-assembled hydrogel vaccines were obviously different. Compared to E-vac, S-vac had a much weaker mechanical property, while K-vac had a much higher. In vivo experiments, co-assembled hydrogel vaccines, especially K-vac, also promoted antibody production and anti-tumor immune responses more significantly than the other two vaccines. Our results demonstrated that co-assembled hydrogels formed by peptides and antigens co-assembly could act as effective vaccine delivery systems for boosting antibody production, and different immune effects can be acquired by tuning the surface properties of the involved self-assembling peptides.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Haonan Yu,Xiaofeng Yang,Hongbin Yang,Jinming Xu,Yanqiang Huang
A phosphorus and nitrogen co-doped graphene (PNG) was developed via a two-step pyrolysis approach through the intermedium of g-C 3 N 4 template and glyphosate as the phosphorus source, and was used for the catalytic dehydrochlorination of 1,2-dichloroethane (EDC) to vinyl chloride monomer (VCM) production. The characterization results indicate that a volcano relationship of surface area and surface properties with the usage of phosphorus precursor was observed, and the sample of PNG-900-6 possesses not only the thin film structure with enhanced surface area but also the smaller grain size of PNG attachments. Accordingly, such PNGs show a great improvement of catalytic performance in the dehydrochlorination of EDC, and the PNG-900-6 catalyst behaves the best with a 4-times higher activity than that on the nitrogen doped graphene (NG). It was also proved that the synergetic effect of the unique P-C coordination on the graphene to generate more quaternary nitrogen species was crucial in determining the catalytic performance of EDC conversion. Our results demonstrate that the phosphorus and nitrogen co-doped graphene offers many advantages in physical structure and chemical property, and are also great potential on the catalytic application in the dehydrochlorination of 1,2-dichloroethane.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jiaxin Li,Yifei Liang,Zhao Li,Ke Fan,Chunxue Wang,Kai Li,Yuan Li,Xin Sun,Ping Ning,Fei Wang
The synthesis of methane from syngas represents a pivotal technology in the artificial synthesis of natural gas, with the study of methanation catalysts being a fundamental aspect of this process. Extensive research has focused on CO methanation using Ni/Al 2 O 3 catalysts; however, enhancements in catalyst stability and low-temperature activity are still required. This research investigated the structure of Ni/Al 2 O 3 under H 2 reduction at varying temperatures and the catalytic performance in natural gas synthesis (SNG) through CO methanation. It was observed that a higher reduction temperature resulted in nickel species agglomeration. Notably, Ni catalysts reduced at 600 °C demonstrated optimal CO conversion and CH 4 selectivity under the tested conditions. Characterization studies uncovered a synergistic effect between Ni and NiO species, which was most effective for catalytic activity under hydrogen reduction at 600 °C but only at an appropriate reduction temperature. These insights are significant for the advancement of Ni/Al 2 O 3 methanation catalysts in natural gas production .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 12
·3487-3504
·
IF 2.5
Liu Cansen,Wu Xianhong,Xu Jianyu,Li Jinyan,Xie Huisi
Developing a coated metal mold to avoid scuff, corrosion, and fouling in rubber vulcanization condition remains challenging. Here, a composite coating is described which combines resistance to fouling, wear, and corrosion by incorporating low surface energy tungsten disulfide (WS 2 ) into a robust cobalt (Co) matrix for wear and corrosion resistance together with antifouling. The dispersity of WS 2 in the electroplating solution is improved by combining chemical modification with mechanical milling. The addition of 2 g/L WS 2 to the electroplating bath produced a Co-WS 2 composite coating with effective tribological and anticorrosion performance in 3.5 wt.% standing NaCl solution at 25 ℃ as well as superior antifouling behavior in rubber vulcanization conducted at 160 ℃ and 9.8 Mpa. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2023
·
IF 3.7
Xin Zhao,Ruiqi Fang,Zirong Shen,Fengliang Wang,Yingwei Li
Transition-metal catalysts with metal nanoparticles (NPs) as active sites are widely utilized in various reactions. In this work, we report the atomic decoration of Pt upon Co NPs for enhanced catalytic performances in oxidation esterification. Systematical characterizations imply the single-atom nature and homogeneous distribution of Pt throughout the formed single-atom alloy (SAA). The synergistic interactions between Pt and Co lead to significant charge redistribution and up-shifted density of states (DOS) toward the Fermi level, which are verified favorable for the adsorption and activation of substrates. The esterification performances of Pt 1 Co@C are evaluated in the transformation of 54 kinds of aromatic alcohols (5-hydromethylfurfural, furfural, and benzyl alcohols) into the corresponding mono- and diesters. Pt 1 Co@C shows not only remarkably enhanced reactivity but also reliable durability in both batch and continuous flow reactors. Mechanism investigations clearly reveal the rapid transformation of 5-hydromethylfurfural over Pt 1 Co@C through a simplified route with reduced energy barriers.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Manlu Cheng,Xingyu Long,Ping Song,Zenghui Diao,Gang Song,Diyun Chen,Lingjun Kong
Stabilization of Co was essential to address its pollution. In this work, geopolymerization was used to stabilize the Co 2+ in the presence of alumina-silicate under hydrothermal process, in which the Co 2+ is hypothesized to be a substitute of cation to balance the charge. Then the Co 2+ could be incorporated into the geopolymer stably being named as Al x Si y Co z -T. Interestingly, the Co 2+ stabilized Al x Si y Co z -T was recycled and reused for peroxymonosulfate (PMS) activation. The stability and catalytic activity of the Al x Si y Co z -T in PMS activation was evaluated. Results showed that the alumina and silicate geopolymerization played positive role in Co 2+ stabilization, what were determined by the molar ratio of alumina to silicate, hydrothermal process. Besides, the Al x Si y Co z -T performed favorable activity in PMS activation for LEV degradation with an efficiency of 98.84 % and rate constant of 0.1154 min −1 . In this case, the Co 2+ was the main catalyst in PMS activation, while the alumina-silicate geopolymerization not only contributed to Co 2+ stabilization, but also resulted in the formation of oxygen vacancy. Then the co-catalytic of alumina-silicate in PMS activation was understood by the synergy factor. The Co 2+ leaching efficiency of AlSi 2 Co 4 -200 is only 0.011 %, confirming the heterogeneous catalytic in PMS activation. The Al x Si y Co z -200 performed favorable stability that could be used for five cycles at least. 1 O 2 , SO 4 − • and •OH contributed to LEV degradation. Thus, the alumina and silicate geopolymerization could play important role in stabilization and co-catalytic for activating PMS, performing the dual effect on waste treatment and resource recycle.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Meiqi Mu,Jing Yu,Zhiqian Yao,Suqiong Xu,Chuicai Rong,Xianke Zhang,Zuzhou Xiong,Xingquan Wang,Xiaokang Li,Jujun Yuan
CeO 2 /Co/C composites have been successfully prepared by a template method. When being applied as electromagnetic (EM) wave absorbers, CeO 2 /Co/C composites exhibit stronger EM wave absorption properties than Co/C and CeO 2 /C composites. The enhanced performance can be attributed to the unique structures of CeO 2 /Co/C composites, in which the synergistic effect of conductance loss, polarization loss together with magnetic loss play an important role for improving the EM wave absorption properties. Additionally, the CeO 2 /Co/C composites own more heterogeneous interfaces and high porosity, which promotes the continuous occurrence of interface polarization and dipole polarization, resulting in increased multiple scattering. The CeO 2 /Co/C composites show a RL min of − 55.02 dB and an EAB of 3.29 GHz at the matching thickness of 2.82 mm. This work provides an effective strategy for constructing CeO 2 /Co/C composites for microwave absorbing material with high performances.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2023
·
IF 10.4
Huping Yan,Zhen Liu,Ronghui Qi
Utilizing ambient humidity to drive electron motion in nanomaterials and generate usable electricity is promising for self-powered electronics and sensors. This paper developed a humidity gradient-driven microgenerator (HGDM) by coating a cobalt hydrogel on part of the TiO 2 nanoparticle film and employing multi-walled carbon nanotubes as electrodes. The humidity gradient was established between the bottom hygroscopic hydrogel and the top electrode in contact with ambient air. Results demonstrated that the TiO 2 /Co hydrogel HGDMs can achieve an open-circuit voltage of 0.95 V at 20 °C and 50–80% relative humidity (RH). The single generator (size: 5 × 4 cm 2 ) exhibited a current output of approximately 0.1 mA, which remained stable for over 100 h with less than 1% decay. The increase in hydrogel films’ height first increased then decrease the performance, and the optimal value was provided. By alternately introducing 10% and 80% RH air humidity cycles, the generator responded rapidly with a wet/dry output ratio over 400, and the delay time maintained within 1.0 s after 1000 cycles. The output performance dropped severely when the air temperature was higher than 40 °C. In practical applications, a series of 5–7 micro-generators successfully delivered consistent power supply to LED lights and calculators for a duration exceeding one week, and the voltage output can be recovered to its initial value after less than 5 h of recharging. Mechanistic studies have revealed that the primary driving force for power generation is the humidity gradient rather than vapor evaporation. Because the diameter of the nanopores (around 200 nm) are much smaller than the Debye length of the double electric layer (960 nm), ion-selective permeability in TiO 2 nanochannels is also important which can prevent nearly 90% OH – from passing through the channels. This hydrogel microgenerator exhibits wide-ranging application prospects, and our study contributes to enhancing its performance and elucidating the mechanism.
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 6
·307
·
IF 4
Deng Li,Huinan Pan,Zhonghai Lin,Xiulian Qiu,Xinyu Zhao,Wei Yang,Wenzhi Zheng,Fengming Ren
Compared with monometallic selenides, heterogeneous bimetallic selenides have rich phase boundaries and superior electrical conductivity. ZnSe/CoSe2composites were prepared by introducing Zn metal and using ZIF-8/67 as the precursor through the synergistic effect between Zn and Co after selenification. The electrocatalytic conversion of polysulfide is accelerated by ZnSe through chemical adsorption and the catalytic effect. The conductive CoSe2surface provides a rapid diffusion path for lithium ions, accelerating the conversion of the polysulfide. On the basis of their individual strengths, ZnSe and CoSe2can jointly promote the smooth adsorptive–diffuse–catalytic conversion process of polysulfide and induce the growth of lithium sulfide around its heterogeneous interface, thus enhancing the electrochemical performance of the lithium–sulfur battery cathode materials. The ZnSe/CoSe2–S electrode, at the optimal Zn-to-Co ratio of 1:1, has a 790.06 mAh g−1initial specific capacity at 0.2 C and excellent cycling stability at 1 C. After 300 cycles, the final capacity is 300.85 mAh g−1, and the capacity retention rate reaches 82.71%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yixi Xu,Yufei Huang,Jia Zhao,Xuhui Han,Chunpeng Chai,Huiling Ma
Two-dimensional nanomaterial MXene Ti 3 C 2 T x with excellent electrical conductivity has received extensive attention in the electromagnetic wave (EMW) absorption field. However, the excessively high permittivity of Ti 3 C 2 T x is not conducive to impedance matching and the absorption of EMW. Considering the low permittivity and mesoporous structure of MOF , in this work, Co/La-MOF were in situ growth on the surfaces of Ti 3 C 2 T x by a facile co-solvothermal method. The obtained Co/La-MOF anchored on Ti 3 C 2 T x (Co/La-MOF/Ti 3 C 2 T x ) composite exhibits low density with excellent EMW absorption performance. Co/La-MOF/Ti 3 C 2 T x -2 (Co 2+ /La 3+ mass ratio of 16:3) shows the minimum reflection loss of − 44.15 dB at 4.00 GHz with the effective absorption bandwidth of 3.67 GHz in the frequency range of 14.03–17.70 GHz under 1.3 mm. In addition, the electromagnetic absorption mechanism of Co/La-MOF/Ti 3 C 2 T x was also investigated. It provides an effective strategy for the preparation of a novel absorber with high EMW absorbing performance.
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2023
·
IF 6.2
Chongkai Ji,Lijie Li,Yulin Nie,Rang Ping,Jiong Peng,Fuhang Song,Xin Li
The application of conductive hydrogels in flexible electronics has attracted much interest in recent years due to their excellent mechanical properties and conductivity. However, the development of conductive hydrogels combining with superior self-adhesion, mechanical properties, antifreeze, and antibacterial activity is still a challenge. Herein, inspired by the structure of the ligament, a multifunctional conductive hydrogel is constructed to address the issue by introducing collagen into the polyacrylamide. The obtained conductive hydrogel exhibits outstanding conductivity (52.08 mS/cm), ultra-stretchability (>2000%), self-adhesion, and antibacterial properties. More significantly, the supercapacitor based on this hydrogel electrolyte achieves a desirable capacitance (514.7 mF·cm–2 at 0.25 mA·cm–2 current density). As a wearable strain sensor, the obtained hydrogel can rapidly detect different movements of the body such as finger, wrist, elbow, and knee joints. It is conceived that this study would provide a potential approach for the preparation of conductive hydrogels in the application of flexible electronics.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）