Small
·
2021
·Vol. 17
·期 50
·2103336
·
IF 13.281
Xuping Liu,Jihuai Wu,Chunyan Wang,Yuqian Yang,Deng Wang,Guodong Li,Yitian Du,Yuan Xu,Lei Zhang,Tingting Zhang,Lan Zhang
The carrier non-radiative recombination and instability of device caused by the inherent defects are main factors limiting development of perovskite solar cells (PSCs). During the fabrication process of a PSC device, perovskite films often produce Pb 0 and I 0 defects. This paper reports a strategy for synergistic optimization of perovskite films by defects passivation and surface modification. The doping of phthalide (PT) in the Pb-rich (CH(NH 2 ) 2 ) 1−x (CH 3 NH 3 ) x PbI 3 film can passivate lead cation defects, and the modification of 1-iodooctadecane (1-IO) can reduce halogen anion defects and improve stability of PSCs owing to its hydrophobicity. The PT and 1-IO optimized device achieves a power conversion efficiency (PCE) of 22.27%. The optimized PSCs remain 93.2% of the initial PCE when placed in air environment (relative humidity of 10%, 25 °C) more than 70 days. The PT and 1-IO synergistic optimization provides a novel strategy for improving the performance and stability of PSCs.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
Green Chemical Engineering
·
2022
·
IF 0
Yumei Liu,Shengxin Chen,Ran An,Xingsheng Wang,Ruixia Liu
The sustainable synthesis of dimethyl maleate via diesterification through the utilization of ionic liquid (IL) is of great importance. However, the relationship between the ILs nature and the reactivity of diesterification is still unclear. Herein, a series of ILs with different structures were selected for the comprehensive investigation of diesterification. The acidity (H 0 ) and Kamlet-Taft solvent parameters (hydrogen bond donor ability (α), hydrogen bond acceptor ability (β), and polarizability (π∗)) of ILs were measured by UV–Visible spectroscopy, and the effects of them on the diesterification of maleic anhydride were also studied in detail. The results indicated that not only H 0 of the IL-based catalysis system, but also its α, β, and π∗ influenced the reaction activity of diesterification. Furthermore, a quantifiable correlation was fitted between the natural logarithm of the rate constant and multiple parameters of ILs, indicating that the diesterification rate had a positive correlation with the H 0 , α, and π∗, and inverse correlation with the β of the IL. A plausible synergetic reaction mechanism for the excellent performance of [(HSO 3 )PMim][HSO 4 ] has been proposed. Overall, this work thoroughly explored the relationship between the nature of ILs on diesterification in-depth, which will reveal the nature of diesterification in detail.
研究领域:
化学工程
·
催化化学
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DOI
BIOCHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 3.8
Rui Zhao,Wenhui Yang,Pengyan Yang,Yunhan Cao,Fenghuan Wang
Carbonic anhydrase (CA) has been suggested as a biocatalyst for carbon dioxide capture since it could effectively catalyze the hydration of carbon dioxide. Metal-organic frameworks (MOFs) have attracted significant attention in the development of immobilized enzyme carriers due to their pore tunability and excellent stability. In this study, UiO-67 materials with varying defect degrees (DUiO-67) were prepared using the organic linker missing method to enhance the catalytic performance. The results indicated that both the defect degree and the pore size of DUiO-67 materials decreased with an increase in acetic acid equivalent. After CA immobilization, all DUiO-67 materials exhibited excellent thermal, pH and recycling stability. CA@DUiO-67–25 showed higher enzyme catalytic activity and conversion ability than the other materials. After 10 cycles, CA@DUiO-67–25 retained 57 % of its initial conversion capacity. The construction of defective MOFs provides a promising new strategy for CA immobilization to achieve the catalytic conversion of CO 2 .
研究领域:
材料科学
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生物催化
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环境科学
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Yan Chen,Li Liao,Jin Liu,Hongxia Gao,Xing Chen,Lexiang Zhang,Liqiang Zou
Vanillin is widely used as a food flavoring agent for its pleasant aroma and biological properties, but its volatility during high-temperature processing limits its effectiveness. In this study, ternary complex microparticles consisting of vanillin/γ-cyclodextrin/dextran (V/C/D) were prepared and applied in bread manufacturing. The retention rate of vanillin during bread baking increased from 44.25% to 69.92% as the proportion of dextran in the complex microparticles (V/C/D 1:9:0-V/C/D 1:5:4) was enlarged. Furthermore, enhanced vanillin retention within the bread improved its resistance to oxidation and spoilage during storage. Incorporating vanillin-complexed microparticles into bread delayed increases in acid value, peroxide value, and total colony count during storage at 37 °C, extending the bread's shelf life from 4 to 6 days. Vanillin retained in the bread inhibited microbial growth, significantly reducing the relative abundance of Bacillus (from 81.98% in blank bread to 7.54% in V/C/D 1:5:4) and Aspergillus flavus (from 99.94% in blank bread to 83.00% in V/C/D 1:5:4) during storage. The results from this research could offer valuable insights into enhancing the quality of natural flavorings and baked goods.
研究领域:
食品科学
·
微生物学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Wen Li,Liyuan Yun,Yunjiao Zhao,Zijian Zhi,Esther Mwizerwa Muhindo,Xiaoyuan Geng,Rui Liu,Tao Wu,Wenjie Sui,Min Zhang
Dextran is widely used as a model polysaccharide to study the interactions between polysaccharides and small molecule sugars. This study examined water sorption isotherms and glass transition temperatures ( T g ) of mixtures of dextran with trehalose , lactose and sucrose for understanding how different disaccharides affect dextran's processing adaptation and storage performance relevant to water sorption. At the same chemical composition , monolayer water ( m 0 ) was dextran & sucrose (dex&suc) > dextran & trehalose (dex&tre) > dextran & lactose (dex&lac). The higher ratios of dextran, the higher was the Guggenheim constant ( C ) value of the mixtures. The compatibility of dextran and disaccharides was dex&tre > dex&lac > dex&suc. Gordon–Taylor model showed dex&tre (2:1) best inhibited water plasticization . Furthermore, trehalose and lactose were more effective in preventing morphological changes of hydrous matrices in the mixtures. The crystallinities of samples at 43% relative humidity (RH) were slightly lower than that at 11% RH.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2015
·
IF 3.893
Jun Fu,Dezhang Ren,Lu Li,Yunjie Liu,Fangming Jin,Zhibao Huo
An efficient conversion of dimethyl phthalate (DMP) to phthalide (PHT) over CuO in aqueous media was investigated. Among the catalysts we tested, various metals or metal oxides were effective for the conversion of DMP to PHT in water, and CuO showed excellent catalytic activity and gave the best result. The PHT yield of 85% was achieved when Zn acted as a reductant. Mechanism study for the conversion of DMP suggested that an intermediate 2-hydroxymethyl benzoic acid was produced in the process. The present study provides a useful route for the production of PHT from DMP.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2011
·
IF 3.463
Haibo Li,Rui Niu,Jinliang Yang,Jun Nie,Dongzhi Yang
A biodegradable tissue adhesive was prepared from dextran urethane (Dex-U), which could be photocrosslinked under the UV irradiation, and steadily adhere to surface of gelatin and mouse skin, which simulate the human tissue. The structures of above Dex-U were characterized by FTIR, 1 H NMR spectroscopy and XRD. The adhesion properties of result products was evaluated by lap-shear test and burst pressure test. The highest adhesion strength and burst pressure could reach to 2.99 MPa and 35 mmHg, respectively. The photopolymerization process of Dex-U was monitored by real time infrared spectroscopy (RTIR), and the surface tension of Dex-U solution was tested by du Nouy Ring method. The cytotoxicity of Dex-U also was evaluated. The relationship between all above properties and degree of substitution of Dex-U was assessed. The adhesive strength of Dex-U is significantly higher than that of fibrin glue. The obtained products present the potential to serve as tissue adhesive in medical area in the future.
研究领域:
生物材料学
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医学工程
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生物化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Xinyan Wan,Dezhang Ren,Yunjie Liu,Jun Fu,Zhiyuan Song,Fangming Jin,Zhibao Huo
An efficient esterification of succinic anhydride (SA) to dimethyl succinate (DMS) using ZnO in methanol was investigated for the first time. ZnO is commercial, low cost, noncorrosive and environmentally friendly metallic oxide and can promote remarkably the production of DMS from SA in excellent yields with high selectivity. The highest yield of DMS of 100% was achieved at the temperature of 140 °C for 10 h. The results indicated that reaction temperature and time had significant influences on the yield of DMS. Mechanism study found that ZnO was first dissolved to form a Zn species, and then redeposited to ZnO during the reaction, which was crucial for SA conversion. The redeposited ZnO could be reused at least 4 times without the loss of the activity. Moreover, the reaction of ethanol and SA was also effective to give excellent yield at the optimal conditions. The present study demonstrates a promising greener way for the synthesis of DMS from biomass-derived SA.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Peijing Shao,Yao Shen,Jiexu Ye,Jingkai Zhao,Lidong Wang,Shihan Zhang
Metal-organic frameworks (MOFs) have been extensively studied as candidate materials for enzyme immobilization over recent years. In this work, carbonic anhydrase was immobilized in ZIFs by “in situ” immobilization method. The growth state of ZIF-8 was adjusted by adjusting the ratio of Zn 2+ and 2-Hmim to obtain crystals with different morphologies (cubic-, dodecahedral- and leaf-shape). In addition, different surfactants (cationic surface-active agent, an-ionic surfactant, and non-ionic surface-active agent) were added as “shape-inducing agents” to further regulate the crystal shapes, thus affecting the activity of enzyme immobilization in ZIFs. Through CO 2 absorption test, it was found that the thick leaf-shaped CA/ZIF-L-(PVP) induced by PVP had a higher relative activity (150%) than other shapes (cubic, dodecahedral, “burr puzzle” shape, “interpenetration leaves” shape, etc.) of immobilized enzymes. In addition, CA/ZIF-L-(PVP) exhibited excellent reusability and stability, which maintained a relative activity of 131% after 5 cycles, and remained approximately 99% relative activity after 15 days at 40 °C in MDEA solution.
研究领域:
材料科学
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生物化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Yangqiang Huang,Yao Ma,Youwei Cheng,Lijun Wang,Xi Li
Ruthenium-based catalysts were prepared by a biogenic method via Cacumen Platycladi leaf extract and tested in the liquid phase hydrogenation of maleic anhydride to the corresponding succinic anhydride. The reaction conditions were optimized by varying the Ru loading, reaction temperature, hydrogen pressure, reaction time and organic solvents to achieve the superb catalytic performance. Reusability tests and comparison with commercial catalysts were also studied on the biosynthesized Ru-based catalysts. Furthermore, a variety of characterization techniques, such as TEM, HRTEM, EDS and XPS showed the effectively introduction of ruthenium nanoparticles into the carbon supports. The analyses of FTIR and TG confirmed that the plant extract served as both reducing and protecting agents..
研究领域:
催化化学
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Yong Zou,Yixin Leng,Chunxiang Huang,Hui Shao,Jun Wang
The solubility of succinic anhydride in pure solvents and binary {gamma-butyrolactone (GBL) + tetrahydrofuran (THF)} mixtures was determined at a limited temperature range of (283.15–323.15) K by using a gas chromatography method. The experimental results revealed two aspects. On the one hand, the solubility of succinic anhydride increased monotonically with rising temperature in binary (gamma-butyrolactone + tetrahydrofuran) mixtures when solvent composition remains constant. On the other hand, the solubility of succinic anhydride decreased monotonically with the increasing tetrahydrofuran content when temperature remains constant. The modified Apelblat equation, λ h equation, CNIBS/R-K equation and Jouyban-Acree equation were successfully used to correlate the experimental solubility in diverse solution systems. Furthermore, the mixing thermodynamic properties of succinic anhydride in binary solvent mixtures were calculated and discussed. The results indicate that the mixing process of succinic anhydride in the investigated solvents is spontaneous.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 5
·498
·
IF 2.935
Wanyong Yu,Na Han,Yongqiang Qian,Xingxiang Zhang,Wei Li
Cellulose was premodified by short-chain fatty acid anhydrides, such as acetic anhydride (CA), propionic anhydride (CP), and butyric anhydride (CB), followed by grafting of polyoxyethylene (2) hexadecyl ether (E2C16) using toluene-2,4-diisocyanate as a coupling agent. The feeding molar ratio of E2C16and the anhydroglucose unit (AGU) was fixed at 4:1, and then a series of CA-g-E2C16, CP-g-E2C16, and CB-g-E2C16copolymers were successfully prepared. The structures and properties of the copolymers were characterized using FTIR (fourier transform infrared spectra),1H-NMR (Proton nuclear magnetic resonance), DSC (Differential scanning calorimeter), POM (polarized light microscopy), TGA (thermogravimetric analysis) and WAXD (wide-angle X-ray diffraction). It was shown that with the anhydride/AGU ratio increasing, the degree of substitution (DS) value of E2C16showed a trend of up first and then down. With the carbon chain length increasing, the DS value of E2C16continuously increases. The phase transition temperature and thermal enthalpy of the copolymers increased with an increasing DS value of E2C16. When the ratio of CB/AGU was 1.5:1, the DS of E2C16was up to the maximum value of 1.02, and the corresponding melting enthalpy and crystallization enthalpy were 32 J/g and 30 J/g, respectively. The copolymers showed solid–solid phase change behavior. The heat resistant temperature of cellulose-based solid–solid phase change materials was always higher than 270 °C. After the grafting reaction, the crystallinity of E2C16decreased, while the crystal type was still hexagonal.Keywords:cellulose;fatty acid anhydride;polyoxyethylene (2) hexadecyl ether;solid–solid phase change
研究领域:
材料科学
·
化学工程
✓ 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）