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CO_(2) hydrogenation to methanol over the copper promoted In_(2)O_(3) catalyst

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Journal of Energy Chemistry 2024年第6期93卷 135-145,I0004页

作者： Rui Zou Chenyang Shen Kaihang Sun Xinbin ma Zhuoshi li maoshuai li Chang-Jun liu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science&Engineering Tianjin UniversityTianjin 300072China

The metal promoted In_(2)O_(3) catalysts for CO_(2) hydrogenation to methanol have attracted wide attention because of their high activity with high methanol ***,there was still no experimental confirmation if copper could be a good promoter for In_(2)O_(3).herein,the Cu promoted In_(2)O_(3) catalyst was prepared using a deposition-precipitation *** prepared Cu/In_(2)O_(3) catalyst shows significantly higher CO_(2) conversion and space time yield(STY)of methanol,compared to the un-promoted In_(2)O_(3) *** loading of Cu facilitates the activation of both h_(2) and CO_(2) with the interface between the Cu cluster and defective In_(2)O_(3) as the active *** Cu/In_(2)O_(3) catalyst takes the CO hydrogenation pathway for methanol synthesis from CO_(2) *** exhibits a unique size effect on the CO *** temperatures below 250℃,CO adsorption on Cu/In_(2)O_(3) is stronger than that on In_(2)O_(3),causing higher methanol *** increasing temperatu res,the Cu catalyst aggregates,which leads to the formation of weak CO adsorption site and causes a decrease in the methanol *** with other metal promoted In_(2)O_(3) catalysts,it can be concluded that the catalyst with stronger CO adsorption possesses higher methanol selectivity.

关键词： CO_(2)hydrogenation Methanol Cu In_(2)O_(3) CO Selectivity DFT

matrix-Mediated Color-Tunable Ultralong Organic Room Temperature Phosphorescence of 7h-Benzo[c]carbazole Derivatives

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CCS Chemistry 2024年第3期6卷 798-811页

作者： Chen Qian Xue Zhang Zhimin ma Xiaohua Fu Zewei li huiwen Jin Mingxing Chen hong Jiang Zhiyong ma Beijing Advanced Innovation Center for Soft matter Science and Engineering State Key Laboratory of Organic–Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029 Beijing National laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871

Building on the recent systematic research on 1hbenzo[f]indole(Bd),an important advancement in constructing ultralong organic room temperature(UORTP)materials with a universal strategy via a readily obtained unit(7h-Benzo[c]carbazole,BCz)is proposed in this *** powders of BCz and its derivatives merely exhibit blue fluorescence at ambient ***,when BCz and its derivatives are dispersed into polymer or powder matrixes,strong photo-activated green UORTP can be observed from their doped systems at room ***,the UORTP color can be tuned between green and yellow depending on the *** ultralong phosphorescence originates from the generation of charge-separated states via *** matrixes play a key role in both stabilizing charge-separated states and controlling UORTP *** interestingly,when using polymethyl methacrylate as matrix,the doped films achieve stronger photo-activated ultralong phosphorescence underwater than in air at room *** Bd,BCz achieves better performance not only in ultralong phosphorescence properties but also in practical *** work gains a deeper insight into the mechanism of UORTP and paves a new approach to applying organic phosphorescent materials to underwater coating and imaging.

关键词： 7h-Benzo[c]carbazole ultralong organic room temperature phosphorescence ion radical matrix-mediated color tunning underwater application

(lu_(1/7)Yb_(1/7)Sc_(1/7)Er_(1/7)Y_(1/7)ho_(1/7)Dy_(1/7))_(2)Si_(2)O_(7)high entropy rare-earth disilicate with low thermal conductivity and excellent resistance to CmaS corrosion

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Journal of Advanced Ceramics 2024年第5期13卷 549-560页

作者： Xu Wang Mingyu Meng Feihan Xu ling liu lihong Gao Shizhen Zhu Zhuang ma School of materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China National Key laboratory of Science and Technology on materials under Shock and Impact Beijing 100081China Tangshan Research Institute Beijing Institute of TechnologyTangshan 063000China

low thermal conductivity,compatible thermal expansion coefficient,and good calcium–magnesium–aluminosilicate(CmaS)corrosion resistance are critical requirements for environmental barrier coatings used on silicon-based ***2Si2O7(RE=rare earth)has been widely recognized as one of the most promising candidates for environmental barrier coatings due to its good water vapor corrosion ***,the relatively high thermal conductivity and poor resistance to CmaS corrosion have limited its practical *** by the high entropy effect,in this work,a novel rare earth disilicate(lu_(_(1/7))Yb_(_(1/7))Sc_(_(1/7))Er_(_(1/7))Y_(_(1/7))ho_(_(1/7))Dy_(_(1/7)))2Si2O7((7RE_(_(1/7)))2Si2O7)has been designed and synthesized by a solid reaction process.(7RE_(_(1/7)))2Si2O7 showed a low thermal conductivity of 1.81 W·m^(−1)·K^(−1)at 1273 ***,the thermal expansion coefficient of(7RE_(_(1/7)))_(2)Si_(2)O_(7)(4.07×10^(−6)℃^(−1)from room temperature(RT)to 1400℃)is close to that of the SiC-based ceramic matrix composites(SiC-CMCs)((4.5–5.5)×10^(−6)℃^(−1)).Additionally,(7RE_(_(1/7)))2Si2O7 exhibited excellent resistance to CmaS *** exposed to CmaS at 1300℃for 48 h,the reaction layer thickness was 22μ*** improved performance of(7RE_(_(1/7)))2Si2O7 highlights its potential as a promising candidate for thermal/environmental barrier coatings.

关键词： high entropy disilicate (lu_(1/7)Yb_(1/7)Sc_(1/7)Er_(1/7)Y_(1/7)ho_(1/7)Dy_(1/7))_(2)Si_(2)O_(7)((7RE_(1/7))_(2)Si_(2)O_(7)) high-temperature thermal properties calcium-magnesium-aluminosilicate(CmaS)corrosion

Preparation of PVA/GO/h-BN Janus Film with high Thermal Conductivity and Excellent Flexibility via a Density Deposition Self-assembly Method

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Chinese Journal of Polymer Science 2024年第8期42卷 1217-1226页

作者： Fang-hua luo Zhi-Tao Dong Guo-hua Chen Chen ma huai-Yuan Wang College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China College of materials Science and Engineering Huaqiao UniversityXiamen 361000China School of Chemical Engineering and Technology and State Key laboratory for Chemical Engineering Tianjin UniversityTianjin 300350China

Janus films with asymmetric physical/chemical properties have attracted con siderable attention due to their promising applications in personal thermal management,electronic skin s,sensors,actuators,***,traditional methods for fabricating Janus films conventionally need the assistance of an interface or auxiliary equipment,which are usually complex and ***,flexible poly(vinyl alcohol)(PVA)/graphene oxide(GO)/h-BN(recorded as PVA/GO/h-BN)Janus films with thermally,optically,and electrically anisotropic properties are fabricated by a simple density deposition self-assem bly method,which just utilizes the density difference between GO and h-BN during water *** results show that the two sides of the acquired Janus films have obvious asymmetric *** the original state of the PVA/GO/h-BN Janus films,the thermal conductivity of the GO side(10.06 W·m^(-1)·K^(-1))is generally lower than that of the h-BN side(10.48W·m^(-1)·K^(-1)).But after GO is reduced,the thermal conductivity of the rGO side reaches 12.17 W·m^(-1)·K^(-1),surpassing that of the h-BN *** addition,the relative reflectance of the h-BN side of Janus film is also significantly higher than that of the rGO side,and the su rface resistance difference between the two sides is about 4 orders of *** prepared PVA/GO/h-BN Janus films show great application potential in human thermal management,light conversion switches,and electronic *** study provides a simple and versatile strategy for fabricating Janus films with multifunctional(such as thermal,optical,and electrical)anisotropies.

关键词： Janus films PVA/GO/h-BN Density deposition self-assembly method

Feasible Synthesis of N,O-Bidentate Difluoroboron Chromophores through Direct Functionalization of Quinoxalin-2(1h)-ones with Ketones in One Shot

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Chinese Journal of Chemistry 2024年第13期42卷 1481-1486页

作者： Shuaichen Zhang Jing Zhang Xiang ling Yifan Zhao Yue ma Peng Sun State Key laboratory for Quality Ensurance and Sustainable Use of Dao-di herbs Artemisinin Research Center and Institute of Chinese Materia MedicaChina Academy of Chinese Medical SciencesBeijing 100700China Department of Pharmaceutics School of PharmacyChina Pharmaceutical UniversityState Key Laboratory of Natural MedicinesNanjingJiangsu 210009China

Organic difluoroboron complexes are a kind of potential platforms for a wide range of applications owing to their excellent photophysical ***,we have explored a simple and direct synthesis methodology for a library of N,O-bidentate difluoroboron complexes from quinoxalin-2(1h)-ones and ketones in one *** photophysical properties of the generated complexes were evaluated and the application potential of these compounds on subcellular imaging was also explored.

关键词： N,O-Bidentate difluoroboron Chromophores Quinoxalin-2(1h)-ones Ketones/Green chemistry Synthetic method C-CcouplingI Boron

Involvement of the ABA-and h_(2)O_(2)-Mediated Ascorbate-Glutathione Cycle in the Drought Stress Responses of Wheat Roots

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Phyton-International Journal of Experimental Botany 2024年第2期93卷 329-342页

作者： Mengyuan li Zhongye Gao lina Jiang leishan Chen Jianhui ma College of life Science Henan Normal UniversityXinxiang453007China School of life Science and Basic Medicine Xinxiang UniversityXinxiang453003China

Abscisic acid(ABA),hydrogen peroxide(h_(2)O_(2)) and ascorbate(AsA)–glutathione(GSh)cycle are widely known for their participation in various ***,the relationship between ABA and h_(2)O_(2) levels and the AsA–GSh cycle under drought stress in wheat has not been *** this study,a hydroponic experiment was conducted in wheat seedlings subjected to 15%polyethylene glycol(PEG)6000–induced *** stress caused the rapid accumulation of endogenous ABA and h_(2)O_(2) and significantly decreased the number of root tips compared with the *** application of ABA significantly increased the number of root tips,whereas the application of h_(2)O_(2) markedly reduced the number of root tips,compared with that under 15%*** addition,drought stress markedly increased the DhA,GSh and GSSG levels,but decreased the AsA levels,AsA/DhA and GSh/GSSG ratios compared with those in the *** activities of the four enzymes in the AsA–GSh cycle were also markedly increased under drought stress,including glutathione reductase(GR),ascorbate peroxidase(APX),monodehydroascorbate reductase(MDhAR)and dehydroascorbate reductase(DhAR),compared with those in the ***,the application of an ABA inhibitor significantly inhibited GR,DhAR and APX activities,whereas the application of an h_(2)O_(2) inhibitor significantly inhibited DhAR and MDhAR ***,the application of ABA inhibitor significantly promoted the increases of h_(2)O_(2) and the application of h_(2)O_(2) inhibitor significantly blocked the increases of ABA,compared with those under 15% *** together,the results indicated that ABA and h_(2)O_(2) probably interact under drought stress in wheat;and both of them can mediate drought stress by modulating the enzymes in AsA–GSh cycle,where ABA acts as the main regulator of GR,DhAR,and APX activities,and h_(2)O_(2) acts as the main regulator of DhAR and MDhAR activities.

关键词： ABA h_(2)O_(2) AsA-GSh cycle drought stress wheat roots

Multi-Scale Design and Optimization of Composite material Structure for heavy-Duty Truck Protection Device

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1961-1980页

作者： Yanhui Zhang lianhua ma hailiang Su Jirong Qin Zhining Chen Kaibiao Deng School of Mechanical and Automotive Engineering Guangxi University of Science and TechnologyLiuzhou545006China Commercial Vehicle Technology Center Dongfeng Liuzhou Automobile Co.Ltd.Liuzhou545005China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China

In this paper,to present a lightweight-developed front underrun protection device(FUPD)for heavy-duty trucks,plain weave carbon fiber reinforced plastic(CFRP)is used instead of the original high-strength ***,the mechanical and structural properties of plain carbon fiber composite anti-collision beams are comparatively analyzed from a multi-scale *** studying the design capability of carbon fiber composite materials,we investigate the effects of TC-33 carbon fiber diameter(D),fiber yarn width(W)and height(h),and fiber yarn density(N)on the front underrun protective beam of carbon fiber *** on the investigation,a material-structure matching strategy suitable for the front underrun protective beam of heavy-duty trucks is ***,the composite material structure is optimized by applying size optimization and stack sequence optimization methods to obtain the higher performance carbon fiber composite front underrun protection beam of commercial *** results show that the fiber yarn height(h)has the greatest influence on the protective beam,and theh1matching scheme for the front underrun protective beamwith a carbon fiber composite structure exhibits superior *** proposed method achieves a weight reduction of 55.21% while still meeting regulatory requirements,which demonstrates its remarkable weight reduction effect.

关键词： Structural optimization front underrun protection device carbon fiber reinforced plastic multi-scale model lightweight design

An oxygenating colloidal bioink for the engineering of biomimetic tissue constructs

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Bio-Design and manufacturing 2024年第3期7卷 240-261页

作者： Seol-ha Jeong Jarno hiemstra Patrick V.Blokzijl Rebeca Damian-Ferrara Danilo martins dos Santos Jéssica h.l.da Fonseca Min-ho Kang Jihyun Kim Dilara Yilmaz-Aykut Mei l.l.Cham-Pérez Jeroen leijten Su Ryon Shin Division of Engineering in Medicine Department of MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMA 02139USA leijten lab Department of Developmental BioEngineeringFaculty of Science and TechnologyTechnical Medical CentreUniversity of TwenteDrienerlolaan 57522 NB EnschedeThe Netherlands Nanotechnology National laboratory for Agriculture(lNNA) Embrapa InstrumentaçãoSao CarlosSao Paulo 13560-970Brazil Department of Biomedical-Chemical Engineering The Catholic University of Korea43 Jibong-roBucheon-siGyeonggi-do 14662Republic of Korea Department of Biotechnology The Catholic University of Korea43 Jibong-roBucheon-siGyeonggi-do 14662Republic of Korea

Ensuring a sufficient oxygen supply is pivotal for the success of bioprinting applications since it fosters tissue integration and natural *** in oxygen concentration among diverse tissues necessitates the precise recreation of tissue-specific oxygen levels in imprinted constructs to support the survival of targeted *** oxygen-releasing biomaterials,such as oxygen-generating microparticles(OMPs),have shown promise for enhancing the oxygen supply of microenvironments in injured tissues,whether this approach is scalable for large tissues and whether tissue-specific bioinks with varying OMP concentrations remain printable remain *** study addresses this critical gap by introducing an innovative class of engineered oxygenated bioinks that combine colloidal-based microgels with *** report that incorporating nanosized calcium peroxide(nCaO_(2))and manganese oxide nanosheets(nMnO_(2))into hydrophobic polymeric microparticles enables precise modulation of oxygen release while controlling hydrogen peroxide ***,the fabrication of oxygenating and cytocompatible colloidal gels is achieved using an aqueous two-phase *** study thoroughly evaluates the fundamental characteristics of the resulting bioink,including its rheological behaviors,printability,shape fidelity,mechanical properties,and oxygen release ***,this study demonstrates the macroscopic scalability and cytocompatibility of printed constructs produced via cell-laden oxygenating colloidal *** showcasing the effectiveness of extrusion-based bioprinting,this study underscores how it can be used to fabricate biomimetic tissues,indicating its potential for new *** findings presented here advance the bioprinting field by achieving scalability with both high cell viability and the possibility of mimicking specifically oxygenated *** work thereby offers a promising avenue for the development of functional tissues with e

关键词： 3D bioprinting Bioink Colloidal gels Extrusion printing Oxygen-generating microparticle

A novel insight of enhancing the hydrogen peroxide tolerance of unspecific peroxygenase from Daldinia caldariorum based on structure

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Chinese Chemical letters 2024年第4期35卷 426-430页

作者： Tiantian li Ruochen Jin Bin Wu Dongming lan Yunjian ma Yonghua Wang School of Food Science and Engineering South China University of TechnologyGuangzhou 510640China School of Bioscience and Bioengineering South China University of TechnologyGuangzhou 510006China Guangdong Youmei Institute of Intelligent Bio-manufacturing Co. Ltd.Foshan 528200China

Unspecific peroxygenases(UPOs, EC 1.***.2.1) is a kind of thioheme enzyme capable of catalyzing various oxidations of inert C–h bonds using h_(2)O_(2) as an oxygen donor without cofactors. however, the enhancement of the h_(2)O_(2) tolerance of UPOs is always challenging. In this study, the A161C mutant of r Dca UPO,which originates from Daldinia caldariorum, was found to be highly h_(2)O_(2)-resistant. Compared with the wild type, the mutant r Dca UPO-A161C showed a 10-h prolonged half-life and a 64% improved enzyme activity when incubated in 10 mmol/l h_(2)O_(2). The crystal structure analysis at 1.47 A showed that r Dca UPOA161C exhibited 10 α-helixes(cyan) and a series of ordered rings, forming a single asymmetric spherical structure. The two conserved domains near heme formed an active site with the catalytic PCP and EhD regions(Glu86, his87, Asp88 residues). The h_(2)O_(2) tolerance of r Dca UPO-A161C was preliminarily explored by comparing its structure with the wild type. Notably, r Dca UPO-A161C showed significantly higher catalytic efficiency than the wild type for the production of hydroxyl fatty acids. This study is anticipated to provide an insight into the structure-function relationship and expand potential applications of UPOs.

关键词： Unspecific peroxygenase Molecular modification hydrogen peroxide stability Crystal structure hydroxyl fatty acids