APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Haihua Wang,Bei Li,Guiqiang Fei,Yiding Shen,Ke Zhu
We reported herein the synthesis of block copolymers and their application in the in-situ emulsion polymerization of waterborne poly (urethane-acrylate) (WPUA) nanoemulsions based on phase inversion process. The polymerizable surfmers containing terminal unsaturated double bonds (MSA-r) were successfully synthesized via catalytic chain transfer polymerization (CCTP). Random copolymer (MSA-t) prepared through radical polymerization was utilized as control. The structure, surface tension and aggregation behavior of surfmers were characterized. The phase inversion, formation and stability of WPUA nanoemulsions were systematically investigated. Effects of MSA-r surfmer content and BMA/MMA ratio on the water resistance and thermal stability of the corresponding films were also discussed. It was found that the phase inversion mechanism of PUA prepolymer in the presence of MSA-r surfmers is different from conventional polyurethane prepolymer. The addition of MSA-r and MSA-t surfmers alters the rheological behaviors of PUA prepolymer via PUA-surfmer interactions, as well as the phase inversion process. Compared with WPUA/MSA-t emulsion, WPUA/MSA-r nanoemulsion displayed improved stability at higher solid content. The minimum particle size of WPUA/MSA-r nanoemulsion was 88.7 nm and kept almost constant after 12-month storage, while the particle size of WPUA/MSA-t emulsion was 131.3 nm and increased to 178.9 nm. Moreover, the WPUA/MSA-r film possessed improved water resistance and thermal stability.
研究领域:
高分子化学
·
胶体与界面科学
·
材料化学
·
纳米材料
·
功能高分子
·
水性涂料
·
聚合物乳液
✓ 已验证
DOI
高影响因子
Biomed Research International
·
2015
·Vol. 2015
·期 1
·139179
·
IF 1.579
Jingjing Sun,Yiling Chen,Jun Sheng,Mi Sun
To improve the reusability and organic solvent tolerance of microbial lipase and expand the application of lipase (hydrolysis, esterification, and transesterification), we immobilized marine microbial lipase using different methods and determined the properties of immobilized lipases. Considering the activity and cost of immobilized lipase, the concentration of lipase was fixed at 2 mg/mL. The optimal temperature of immobilized lipases was 40°C and 5°C higher than free lipase. The activities of immobilized lipases were much higher than free lipase at alkaline pH (more than 50% at pH 12). The free lipase lost most activity (35.3%) and immobilized lipases retained more than 46.4% of their initial activity after 3 h heat treatment at 70°C. At alkaline pH, immobilized lipases were more stable than free lipase (more than 60% residue activity at pH 11 for 3 h). Immobilized lipases retained 80% of their activity after 5 cycles and increased enzyme activity (more than 108.7%) after 3 h treatment in tert-butanol. Immobilization of lipase which improved reusability of lipase and provided a chance to expand the application of marine microbial lipase in organic system expanded the application range of lipase to catalyze hydrolysis and esterification in harsh condition.
研究领域:
酶工程
·
分子生物学
·
生物催化
·
工业微生物学
·
蛋白质化学
·
应用酶学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2025
·Vol. 35
·期 7
·2341-2353
·
IF 4.7
Han-zhou LIU,Yan-chen LIU,Sheng-hao JING,Ya-qi HU,Zong-liang ZHANG,Si-liang LIU,Yang LIU,Zhi ZHUANG,Fan-qun LI,Fang-yang LIU
A dual-halide solid electrolyte, Li 3 YCl 3 Br 3 , was synthesized using a wet-chemistry route instead of the conventional mechanical ball-milling route. Li 3 YCl 3 B r3 exhibits an ion conductivity of 2.08 mS/cm and an electro- chemical stability window of 3.8 V. Additionally, an all-solid-state lithium-ion battery using Li 3 YCl 3 Br 3 and LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM811) as the cathode material achieves a capacity retention of 93% after 200 cycles at 0.3 C and maintains a specific capacity of 115 mA·h/g during 2 C cycling. This exceptional performance is attributed to the high oxidative stability of Li 3 YCl 3 Br 3 and the in-situ formation of Y 2 O 3 inert protective layer on the NCM811 surface under high voltage. Consequently, the study demonstrates the feasibility of a simple, cost-effective wet-chemistry route for synthesizing multi-component halides, highlighting its potential for large-scale production of halide solid electrolytes for practical applications.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
电池技术
·
无机非金属材料
·
纳米材料应用
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 15
·期 3
·2528-2538
·
IF 1.5
Wenhui Geng,Mengmeng Zheng,Dan Chen,Xianwen Wang,Zekai Zhang,Yishan Lin,Dongqin Cai,Huiqin Li,Guobo Huang,Yanxian Jin Yu,Binbin Yus
Palladium catalyst (Pd) are made attention to application in alcohol fuel cells due to unique performance, as well as the resource abundance and low cost, but the catalyst performance and stability of the catalysts are still not satisfied. In this article, the novel PdFe/B-N-G catalysts with the double element alloying and dual-doping for ethanol electro-oxidation are successfully prepared and determined by XRD, TEM and XPS. TEM results reveal a relatively uniform and high dispersion of Pd particles is observed on PdFe/B-N-G catalyst. The XPS analysis indicates that Pd(0) contents of the PdFe/B-N-G catalyst are increased on account of the B, N-doping effect. Being explored as the catalyst to the ethanol oxidation reactions, the PdFe/B-N-G catalysts exhibit the better electrocatalytic activity with higher current densities and catalyst stability compared to those of PdFe/G and Pd/B-N-G, which can be attributed to the synergistic effect of the enhanced PdFe alloying and the B, N-doping, that can produce more activity sites dispersing on the surface of graphene. Thus, the novel PdFe/B-N-G catalysts can be the potential alternate in alcohol fuel cells.
研究领域:
电化学
·
纳米催化
·
能源材料
·
燃料电池
·
表面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2016
·Vol. 127
·期 3
·1889-1895
·
IF 1.781
Yuan Kangkang,Gan Xinzhu,Wang Xinqiang,Zhu Luyi,Zhang Guanghui,Xu Dong
The present study fully reports the decomposition of polyacetylacetonatozirconium (PAZ) in air with thermogravimetry–differential scanning calorimetry and Fourier transform infrared spectroscopy. The influence of water vapor on the decomposition of PAZ was characterized with the Fourier transform infrared spectroscopy. Crystallization and phase transformation of PAZ were studied by X-ray diffraction and Raman spectroscopy. The experimental results show that water vapor promotes the decomposition of PAZ and crystallization of zirconia compared with air. Furthermore, the effect of different amount of stabilizer Y(NO 3 ) 3 ·6H 2 O on the pyrolysis and phase stabilization of PAZ shows that NO 3
− was beneficial to the oxidation of organic components and the formation of Y 2 O 3 could stabilize tetragonal zirconia and hinder grain growth.
研究领域:
材料化学
·
无机化学
·
纳米材料
·
热分析
·
光谱学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Jianyi Liu,Yan Liu,Dianxin Jin,Minjia Meng,Yinhua Jiang,Liang Ni,Zhanchao Liu
Tannic-acid-templated large pore mesoporous silica nanoparticle (LMSN) was synthesized using one-pot procedure and the external surface was further modified with APTES (LMSN-N) to immobilize trypsin. After modification, trypsin was difficult to be immobilized on the outer surface of the LMSN due to the electrostatic repulsion. Naturally, study of the trypsin immobilized in the interior pores could be implemented solely. Meanwhile, the activity of immobilized trypsin was optimized by response surface method (RSM), and the ANOVA was employed to explore the interaction between independent variables. The maximum enzyme activity (12.28 U/mg) was obtained under a certain condition that the quality of T-LMSN-N-272 was 153 μg, the pH was 7.9, and the temperature was 40.4 °C. Simultaneously, the immobilized enzyme was proved to possess better thermal stability, storage stability and recycling performance than free enzyme.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Shu-Sen Liu,Yong-Yong Jin,Yahong Han,Jinxian Zhao,Jun Ren
It is a big challenge to improve the stability and anti-coking abilities of catalyst in high temperature CO methanation reaction. To address the issue, SiC was chose as the support, and Ce was used as a promoter to prepare supported Ni catalysts for CO methanation. A long-term high temperature stability evaluation experiment was carried out at 600 °C for 100 h in comparison with Ni/Al 2 O 3 catalyst. The catalysts were characterized by a combination of characterization techniques for understanding the catalytic performance and carbon deposition behaviors in CO methanation. The life test result indicates that, compared to Ni/Al 2 O 3 , Ni/SiC is thermally stable and highly resistant to carbon deposition . Improved cataytic activity and stability was further reached by introduce of Ce promoter into Ni/SiC, which can be attributed to the enhanced interaction between Ni and SiC and improved dispersion of Ni active species.
研究领域:
催化化学
·
能源化学工程
·
材料科学
·
工业催化
·
化学反应工程
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 3
·1577-1593
·
IF 3.917
Jiang Yan,Liu Xiuyu,Yang Qiang,Song Xueping,Qin Chengrong,Wang Shuangfei,Li Kecheng
Abstract This study investigated effects of residual lignin on composition, structure and properties of cellulose fibrils and cellulose fibril-based films by comparing two groups of cellulose fibrils which contained different amounts of lignin (15% and 2%, respectively) but were similar in cellulose to hemicellulose ratio. The results showed that lignin affected the size and content of nanofibril in cellulose fibrils through initially delaying but ultimately facilitating the mechanical defibrillation. Due to higher thermal stability and strong UV absorption capability, lignin enhanced the thermal stability and UV blocking properties of cellulose fibril-based film. Hydrophobic lignin also improved the dewatering of cellulose fibrils and the hydrophobicity of cellulose fibril-based film. Lignin interfered with the interfibrillar hydrogen bonding and therefore increased the mesopore diameter of cellulose fibril network. Lignin acting as a cement in cellulose fibril-based film made the film with a more densely packed structure, a higher density and a smoother surface. However, lignin decreased the transparency of cellulose fibril-based film due to its chromophore groups and impaired the mechanical strength of cellulose fibril-based film through interfering with the interfibrillar hydrogen bonding. Graphical abstract
研究领域:
材料科学
·
植物学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6451-6460
·
IF 3.442
Zhang Yixin,Liu Lei,Zhang Lili,Yu Yifeng,Lv Haijun,Chen Aibing
Carbon nanotube (CNT) has been intensively studied as supercapacitor electrode materials due to their high mechanical strength and excellent electrical conductivity. However, CNT with limited accessible surface area has low specific capacitance, which limits its application and development in supercapacitor. Herein, we have designed a thin N-doped porous carbon layer-modified CNT nanocomposite by template-free method. In this process, 3-aminophenol and formaldehyde rapidly self-assemble on the CNT in the presence of cationic surfactant CTAB, forming the composite of 3-aminophenol/formaldehyde (3-AF) resin and CNT. Due to the different polymerization degree of inside 3-AF resin, the soluble 3-AF resin oligomer was removed by acetone to form porous 3-AF resin and CNT@N-doped porous carbon (CNT@N-PC) was obtained by annealing process. The CNT@N-PC exhibited abundant porous structure, high specific surface area of 940 m 2 g −1 , excellent specific capacitance value of 224 F g −1 at 1 A g −1 and good cycle stability, demonstrating its potential as supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Xinyu Ni,Xuyan Li,Guojing Ran,Jiali Chen,Xinwei Jiang,Jianxia Sun,Weibin Bai
This study aimed to determine whether Trachinotus ovatus and Pampus argenteus could be differentiated by multi-element composition or stable isotope ratio analysis of δ 13 C and δ 15 N. The multi-element analysis values of a total of 60 Pampus argenteus samples from three sites and 60 Trachinotus ovatus samples from four sites around China were determined, and the other 60 samples of Pampus argenteus and 51 samples of Trachinotus ovatus were tested by principal component analysis (PCA) to estimate the accuracy of origin identification. The results showed that the cross-validation accuracy rate is 92.2% for the Pampus argenteus and 98.3% for the Trachinotus ovatus . Stable isotope analysis of δ 13 C and δ 15 N also can distinguish Trachinotus ovatus from different geographical origins. These results showed that the usefulness of multi-element and stable isotope analysis as indicators for authenticating the geographical origin of two pomfrets in China.
研究领域:
食品科学
·
海洋生物学
·
分析化学
·
生态学
·
溯源技术
·
水产养殖
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yonghui Xu,Liang Zhang,Shuwen Yin,Xiudi Wu,Hongpeng You
Despite significant progress has been made in the luminescent materials for white light emitting diodes (WLEDs), it is still desirable to develop novel highly efficient phosphors with appropriate excitation and high visible emission for high color rendering WLEDs. In this study, we report a novel phosphor BaGa 2 Si 2 O 7 :Ce 3+ ,Tb 3+ (BGSO:Ce 3+ ,Tb 3+ ) with highly effective green luminescence. BGSO:Ce 3+ ,Tb 3+ phosphor represents a broad excitation band in the range of 300–400 nm and intense emission at approximately 542 nm with a high photoluminescence quantum efficiency of 76.4%. The structure, luminescence, and energy transfer from the Ce 3+ and Tb 3+ ions were investigated in detail. Moreover, the incorporation of Na + or K + ions into BGSO:Ce 3+ ,Tb 3+ for charge compensation can improve the emission intensity and thermal stability. Moreover, a near ultraviolet (n-UV) pumped prototype WLED device was fabricated and it exhibited bright warm-white light with CIE chromaticity coordinates of (0.3561, 0.3344), high color-rendering index (Ra=90.4), and low CCT (3330 K) upon 20 mA driving current. This work provides a new strategy to develop high-quality solid-state LED phosphors.
研究领域:
材料科学
·
光学工程
·
固体物理
·
发光材料
·
半导体器件
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 21
·30039-30042
·
IF 4.527
Leihao Feng,Qiwei Hu,Li Lei,Lei Qi,Leilei Zhang,Meifang Pu,Zili kou,Fang Peng,Duanwei He,Yohei Kojima,Hiroaki Ohfuji,Tetsuo Irifune
High-hardness TaN compacts with a diameter and height of 6 mm were synthesized through the phase transformation of CoSn-type into WC-type TaN under experimental conditions of high temperature and high pressure . The Vickers hardness of WC-type TaN compacts obtained at the pressure of 5 GPa and the temperature of 1873 K is found to be ~21.5 ± 1.5 GPa with a load of 3 Kg, which is comparable to that of the pure tungsten carbide compact (~20 GPa) and higher than those of ultrahigh temperature ceramics ZrB 2 and HfB 2 under the same load. The high hardness of WC-type TaN compacts presented in this work is attributed to the deviatoric strain and well-bonded nanograins . The synthesized WC-type TaN compacts also possess a high oxidation temperature (1072 K). These results suggest that the WC-type TaN with high hardness and high thermal stability holds great promise for industrial applications.
研究领域:
材料科学
·
无机非金属材料
·
超硬材料
·
高温材料
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）