检索结果-南通市图书馆

Encapsulation of inorganic particles by dispersion polymerization through ultrasonic irradiation

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2005年第6期48卷 545-552页

作者： zhanG Kai1,2. FU Qiang1, HUANG Yuhong2.& {2. Dehui2.1. college of Polymer Science and Engineering, Sichuan university, Chengdu 610065, china 2. Institute of Structure Mechanics, china Academy of Engineering Physics, Mianyang 62.900, china college of Polymer Science and Engineering Sichuan University Chengdu China Institute of Structure Mechanics China Academy of Engineering Physics Mianyang China

The nano-silica/polystyrene composite particles were prepared and characterized according to the following steps. First, the nano-silica particles were pretreated with surfactants under ultrasonic field. Second, the dispersion polymerization of styrene in a water/ethanol (1/6, weight ratio) medium, with poly(N-vinyl pyrrolidone) (PVP) as stabilizer and 2.2.-azobisizobu- tyronitrile (AIBN) as initiator in the presence of nano-silica particles was initiated with N2.purging through ultrasonic irradiation by taking its advantages of multieffect, i.e. dispersion, crushing, activation, and initiation. Finally, the polymerization kinetics characteristics were studied, and the encapsulation of composite particles was investigated with optical microscope, SEM, TEM, FTIR, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC).

关键词： composite particle, dispersion polymerization, ultrasonic irradiation.

A Real-time Prediction System for Molecular-level Information of Heavy Oil Based on Machine Learning

在线全文

学校读者我要写书评

暂无评论

china Petroleum Processing & Petrochemical Technology 2024年第2期26卷 121-134页

作者： Yuan Zhuang Wang Yuan zhang Zhibo Yuan Yibo Yang Zhe Xu Wei Lin Yang Yan Hao zhou Xin Zhao {2. Yang Chaohe State Key Laboratory of Chemical Safety SINOPEC Research Institute of Safety Engineering Co.LtdQingdaoShandong 266000People’s Republic of China State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdaoShandong 266580People’s Republic of China college of chemistry and Chemical Engineering Ocean University of ChinaQingdaoShandong 266100People’s Republic of China

Acquiring accurate molecular-level information about petroleum is crucial for refining and chemical enterprises to implement the“selection of the optimal processing route”*** the development of data prediction systems represented by machine learning,it has become possible for real-time prediction systems of petroleum fraction molecular information to replace analyses such as gas chromatography and mass ***,the biggest difficulty lies in acquiring the data required for training the neural *** address these issues,this work proposes an innovative method that utilizes the Aspen HYSYS and full two-dimensional gas chromatography-time-of-flight mass spectrometry to establish a comprehensive training ***,a deep neural network prediction model is developed for heavy distillate oil to predict its composition in terms of molecular *** training,the model accurately predicts the molecular composition of catalytically cracked raw oil in a *** validation and test sets exhibit R2.values of 0.99769 and 0.99807,respectively,and the average relative error of molecular composition prediction for raw materials of the catalytic cracking unit is less than 7%.Finally,the SHAP(SHapley Additive ExPlanation)interpretation method is used to disclose the relationship among different variables by performing global and local weight comparisons and correlation analyses.

关键词： heavy distillate oil molecular composition deep learning SHAP interpretation method

Controlled free radical polymerization of styrene initiated from the alkoxyamine-functionalized silicon surface

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2005年第5期48卷 449-458页

作者： CHEN Zhijun1, zhou Sikai1, LU Wenzhong1, FANG Shaoming1, JIANG Xiqun2.& YANG Changzheng2.1. {2. of Materials and Chemical Engineering, Zhengzhou university of Light Industry, Zhengzhou 450002. china 2. Laboratory of Mesoscopic Material Science and Department of Polymer Science & Engineering, {2. of chemistry & Chemical Engineering, Nanjing university, Nanjing 2.0093, china college of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou China Laboratory of Mesoscopic Material Science and Department of Polymer Science & Engineering College of Chemistry & Chemical Engineering Nanjing University Nanjing China

We describe a new method of fabricating a brush-like polystyrene layer anchored on the surface of the silicon substrate, which involves three steps, namely (i) the attachment of 3-methacryloxypropyltrimethoxysilane onto the silicon surface; (ii) the reaction of vinyl moiety at another extremity of the anchored 3-methacryloxypropyltrimethoxysilane to 4-Hydroxyl-2. 2. 6, 6-tetramethyl-1-piperidinyloxy (HTEMPO?) catalyzed by azobisisobutyronitrile (AIBN); (iii) living free radical grafting polymerization of styrene in the presence of HTEMPO?. The controllable living free radical polymerization permits accurate control of both the molecular weight and the polydispersity. X-photoelectron spectroscopy measurement proved that the alkoxyamine initiator layer forms on the silicon surface. XPS and Ellipsometry measurements showed that the poly-styrene chains were covalently anchored onto the silicon surface. The thickness of the grafted polymer layer can be accurately manipulated by altering the polymerization time. The new method allows synthesizing random copolymer and block copolymers by the sequential growth of monomers from the substrate surface.

关键词： polymer brush, controlled living free radical polymerization, thickness, atomic force microscopy, 3-methacryloxypropyltrimethoxysilane.

Applying flexible molecular docking to simulate protein retention behavior in hydrophobic interaction chromatography

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2007年第5期50卷 675-682页

作者： zhou Peng1, TIAN FeiFei1 & LI ZhiLiang1,2.1 college of {2. and Chemical Engineering, Chongqing university, Chongqing 400044, china 2.State Key Laboratory of Chemo/Biosensing and Chemometrics, Changsha 410082. china college of chemistry and Chemical Engineering Chongqing University Chongqing China State Key Laboratory of Chemo/Biosensing and Chemometrics Changsha China

Interaction between proteins and stationary phase in hydrophobic interaction chromatography (HIC) is differentiated into two thermodynamic processes involving direct nonbonding/conformation interac- tion and surface hydrophobic effect of proteins, hence quantitatively giving rise to a binary linear rela- tion between HIC retention time (RT) at concentrated salting liquid and ligand-protein binding free en- ergy. Then, possible binding manners for 2. proteins of known crystal structures with hydrophobic ligands are simulated and analyzed via ICM flexible molecular docking and genetic algorithm, with re- sults greatly consistent with experimental values. By investigation, it is confirmed local hydrophobic effects of proteins and nonbinding/conformation interaction between ligand and protein both notably influence HIC chromatogram retention behaviors, mainly focusing on exposed portions on the protein surface.

关键词： hydrophobic interaction chromatography, flexible molecular docking, genetic algorithm, protein, salting-in factor

Functional microfluidics:theory,microfabrication,and applications

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第3期6卷 140-173页

作者： Mingzhu Xie Ziheng zhan Yinfeng Li Junkai Zhao Ce zhang Zhaolong Wang Zuankai Wang Interdisciplinary Research Center of Low-carbon Technology and Equipment College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082People’s Republic of China Energy Research Institute of Shandong Academy of sciences Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014People’s Republic of China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology(CAST)Beijing 100094People’s Republic of China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHong Kong Special Administrative Region of China 999077People’s Republic of China

Microfluidic devices are composed of microchannels with a diameter ranging from ten to a few hundred ***,quite a small(10-9–10-18l)amount of liquid can be manipulated by such a precise *** the past three decades,significant progress in materials science,microfabrication,and various applications has boosted the development of promising functional microfluidic *** this review,the recent progress on novel microfluidic devices with various functions and applications is ***,the theory and numerical methods for studying the performance of microfluidic devices are briefly ***,materials and fabrication methods of functional microfluidic devices are ***,the recent significant advances in applications of microfluidic devices are highlighted,including heat sinks,clean water production,chemical reactions,sensors,biomedicine,capillaric circuits,wearable electronic devices,and ***,perspectives on the challenges and future developments of functional microfluidic devices are *** review aims to inspire researchers from various fields engineering,materials,chemistry,mathematics,physics,and more—to collaborate and drive forward the development and applications of functional microfluidic devices,specifically for achieving carbon neutrality.

关键词： capillary theory functional devices functional microfluidics

Progress of additives for morphology control in organic photovoltaics

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 38-46页

作者： Zhongjie Li Xiangyue Kong Yuhao Liu Huayu Qiu Lingling zhan Shouchun Yin Key Laboratory of Organosilicon chemistry and Materials Technology of Ministry of Education College of MaterialChemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 311121China

The microstructure of the active layer in organic photovoltaics(OPVs),such as the size of phase separation,purity of the phases,and molecular packing within each phase,plays a crucial role in influencing the behavior of excitons and charge carriers within the active *** is also a key determinant of the photovoltaic performance of the *** the optimization of OPV devices,the use of additives has been demonstrated to be an effective strategy in microstructure control,leading to enhanced ***,the quest for stable and efficient novel additives,along with an exploration and summarization of the mechanisms underlying additive-induced microstructure control,is essential for a better understanding of the developmental trends of high-performance *** this review,we categorize additives based on their chemical structures and discuss their effects on the microstructure of the active layer from both thermodynamic and kinetic ***,we elaborate on the working mechanisms and their impact on the photovoltaic performance of the *** review provides an overview of recent advances in additives for OPVs,offering potential guidance for the future development of additives and further optimization of the active layer in photovoltaic devices.

关键词： Organic photovoltaics Additives Active layer morphology Mechanisms Photovoltaic performances

On the Role of Boric Acid in the Copper-Tin Alloy Bath

在线全文

学校读者我要写书评

暂无评论

wuhan university Journal of Natural {2. 1999年第2期4卷 92-96页

作者： ZUO Zheng zhong, zhou Xiao rong,ZUO Chao {2. of chemistry,wuhan university,wuhan 43.072.china wuhan university College of Chemistry Wuhan China (GRID:grid.49470.3e) (ISNI:***)

The role of boric acid in the copper tin alloy bath has been investigated by means of the cathodic polarization curves,cyclic voltammograms,rate of alloy electrodeposition and morphological analysis of *** results indicate that the presence of boric acid in weak acidic solution for electrodeposition of Cu Sn alloy raises the overvoltage of hydrogen discharge and lowers the overvoltage of Cu,Sn and Cu Sn alloy deposition on the Pt,and accelerates the rate of *** acid was adsorbed on the surface of cathode and inhibited reduction of hydrogen,then the adsorbed boric acid promoted electrodeposition of metals as a ***,as the concentration of boric acid is more than 0.50 mol/L,the above effect was weakened due to the complexation reaction between the excessive boric acid and metallic ions.

关键词： electroplating electrodeposition of copper tin alloy boric acid

Molecular mechanism for the unusual enhancement of the second-step chemiluminescence production from the carcinogenic tetrabromohydroquinone and H2._(2.

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2024年第7期141卷 330-342页

作者： Zi-Han Wang Chun-Hua Huang Zhi-Sheng Liu Li Mao Ben-zhan Zhu State Key Laboratory of Environmental chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China college of Environment and Resources University of Chinese Academy of SciencesBeijing 100049China

We have found recently that two-step intrinsic hydroxyl radical(·OH)-dependent chemiluminescence(CL)could be produced by carcinogenic tetrahaloquinone and H_(2.O_(2..However,the first-step CL was too fast to clearly detect the stepwise generation of·OH and CL,and to distinguish the exact dividing point between the first-step and second-step *** we found that,extremely clear two-step intrinsic CL could be produced by the relative slow reaction of tetrabromohydroquinone(TBHQ)with H_(2.O_(2.,which was directly dependent on the two-step·OH ***,the second-step,but not the first-step CL production of TBHQ/H_(2.O_(2.(CRET donor)was markedly enhanced by fluorescein(a typical xanthene dye,CRET acceptor)through a unique chemiluminescence resonance energy transfer(CRET)*** novel CRET system of TBHQ/H_(2.O_(2./fluorescein was successfully applied for the sensitive detection of TBHQ with the detection limit as low as 2.5μmol/*** findings will help to develop more sensitive and highly efficient CL or CRET systems and specific CL sensor to detect the carcinogenic haloquinones,which may have broad environmental applications.

关键词： Two-step chemiluminescence Bromohydroquinone Hydrogen peroxide Hydroxyl radical CRET

The proximity between hydroxyl and single atom determines the catalytic reactivity of Rh1/CeO_(2. single-atom catalysts

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第1期17卷 397-406页

作者： Danfeng Wu Shuyun zhou Congcong Du Juan Li Jianyu Huang {2.-xia Shen Abhaya K.Datye Shan Jiang Jeffrey T.Miller Sen Lin Haifeng Xiong State Key Laboratory of Physical chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China college of Biology and Chemical Engineering Jiaxing UniversityJiaxing 314000China Department of Chemical&Biological Engineering University of New MexicoAlbuquerqueNM 8731-0001USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN 47907-2100USA Innovation Laboratory for sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China Fujian Key Laboratory of Rare-earth Functional Materials Fujian Shanhai Collaborative Innovation Center of Rare-earth Functional MaterialsLongyan 366300China

The local structure of the metal single-atom site is closely related to the catalytic activity of metal single-atom catalysts(SACs).However,constructing SACs with homogeneous metal active sites is a challenge due to the surface heterogeneity of the conventional ***,we prepared two Rh1/CeO_(2.SACs(0.5Rh1/r-CeO_(2.and 0.5Rh1/c-CeO_(2.,respectively)using two shaped CeO_(2.(rod and cube)exposing different facets,i.e.,CeO_(2.(111)and CeO_(2.(100).In CO oxidation reaction,the T100 of 0.5Rh1/r-CeO_(2.SACs is 12.°C,while the T100 of 0.5Rh1/c-CeO_(2.SACs is as high as 2.0°*** in-situ CO diffuse reflectance infrared Fourier transform spectroscopy(CO-DRIFTS),we found that the proximity between OH group and Rh single atom on the plane surface plays an important role in the catalytic activity of Rh1/CeO_(2.SAC system in CO *** Rh single atom trapped at the CeO_(2.(111)crystal surface forms the Rh1(OH)adjacent species,which is not found on the CeO_(2.(100)crystal surface at room ***,during CO oxidation,the OH group far from Rh single atom on the 0.5Rh1/c-CeO_(2.disappears and forms Rh1(OH)adjacent species when the temperature is above 150°*** formation of Rh1(OH)adjacentCO intermediate in the reaction is pivotal for the excellent catalytic activity,which explains the difference in the catalytic activity of Rh single atoms on two different CeO_(2.*** formed Rh1(OH)adjacent-O-Ce structure exhibits good stability in the reducing atmosphere,maintaining the Rh atomic dispersion after CO oxidation even when pre-reduced at high temperature of 500°*** functional theory(DFT)calculations validate the unique activity and reaction path of the intermediate Rh1(OH)adjacentCO species *** work demonstrates that the proximity between metal single atom and hydroxyl can determine the formation of active intermediates to affect the catalytic performances in catalysis.

关键词： crystal plane Rh1/CeO_(2.single-atom catalyst proximity of Rh and hydroxyl coordination structure CO oxidation