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growth process and short chain alcohol separation performance of fluoride-containing NaY zeolite membrane

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Chinese Journal of Chemical Engineering 2021年第1期34卷 154-159页

作者： Xiaopan Chen Meihua Zhu Sitong Xiang Tian Gui TingWu Yuqin Li NaHu Izumi Kumakiri Xiangshu Chen Hidetoshi Kita State-Province Joint Engineering Laboratory of Zeolite MembraneMaterials Institute of AdvancedMaterialsCollege of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China Graduate School of Science and Technology for Innovation Graduate School Science and EngineeringYamaguchi UniversityUbe 755-8611Japan

growth process of the NaY zeolite membranes was investigated by fluoride-containing precursor synthesis *** with the fluoride-free precursor synthesis gel,the irregular NaY zeolite crystals were dissolved into amorphous by the fluoride-containing precursor synthesis gel initially,the amorphous contained the Y-type zeolite characteristic bands by the IR *** fine square NaY zeolite crystals arose from the amorphous,which were accumulated and gradually grew into a dense NaY zeolite layer on the support surface after 6.5 *** the excessive NaY zeolites were dissolved by the strong alkaline and fluoride-containing precursor synthesis gel,there was plenty of amorphous on NaY zeolites layer for prolonging the crystallization *** assynthesized NaY zeolite membranes had a good separation performance and repeatability for separation of 10 wt%methanol(MeOH)/methyl methacrylate(MMA) mixture by pervaporation,the flux and separation factor were(1.27 ± 0.07) kg·M^(-2)·h^(-1) and(4900 ± 1500) at 323 K,***,the NaY zeolite membranes were applied to separate the other short chain alcohol from the various alcohol/organic ester and alcohol/organic ether mixtures,the NaY zeolite membranes showed high short chain alcohol perm-selectivity.

关键词： NaY zeolite membrane growth process Fluoride-containing Short chain alcohols Pervaporation

Morphology and growth process of Bat-like ZnO Crystals by Thermal Evaporation

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Chinese Journal of Chemical Physics 2016年第3期29卷 369-373,I0002页

作者：高品王凯黄超孟路徐法强中国科学技术大学合肥国家同步辐射实验室合肥230026

A novel bat-like ZnO nanostructure was synthesized on the silicon substrate by simple ther- mal evaporation of zinc powders without any catalyst. Each bat-like nanorod （＂nanobat＂） is composed of a hexagonal head, a continuous neck and a thin handle. High-resolution transmission electron microscopy and selected area electron diffraction results reveal the single-crystalline feature and the growing direction along [0001] of the nanobat. The vapor- solid mechanism was found suitable to explain the growth process of the nanobat and a schematic model was proposed in detail based on the experimental results.

关键词： ZnO Thermal evaporation Nanostructure growth process

Synthesis and growth process: A Tetrapod-Like ZnO Nanostructure

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Journal of China University of Geosciences 2007年第2期18卷 148-152页

作者：皮振邦苏小路田甜裴芳杨超田熙科 Faculty of Material Science and Chemical Engineering China University of Geosciences

Three kinds of tetrapod-like ZnO nanostructures have been synthesized simultaneously via pure Zn chemical vapor deposition on silicon wafers with （111） orientation （Si （111）） at 920 ℃. X-ray diffraction indicates that the nanotetrapods are of wurtzite structure. The morphology and the microstructure of the nanotetrapods are investigated by the scanning electron microscopy. Selected area electron diffraction shows the growth direction, and energy dispersive X-ray spectroscopy reveals the atomic composition ratio of Zn/O. The growth process is briefly discussed. The optical property of the products was also recorded by means of photoluminescence spectroscopy.

关键词： tetrapod-like ZnO chemical vapor deposition growth process

growth process and Mechanism of Silver Dendritein HF/AgNO3/Si System

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Growth Process and Mechanism of Silver Dendritein HF/AgNO3/S...

The Models for growth process of Spruce-fir Forest

2011 IEEE International Conference on Waste Recycling,Ecology and Environment(ICWREE 2011)

作者： Wenbin YANG 1 2 * Kai ZHANG 3 Jinghui FAN3 Juying WU3 Qiang YAN4 1State Key Laboratory Cultivation Base for Nonmetal Composite and Functional Materials Southwest University of Science and Technology Mian yang China 2 School of Materials Science and Engineering Southwest Universit y of Science and Technology Mian yang China 3 Institute of System Engineering China Academy of Engineening Physics Mian yang China 4 Southwest Institute of Physics Chengdu China

A kind of straightforward method was developed to fabricate Ag dendrites with hierarchical structures in AgNO3/HF/Si system at room temperature . High quality Ag dendrites were produced on silicon substrate as the form of uniform solid film with a thickness of 3 mm . The X-ray diffraction analysis reveals that face-centre cubic Ag phases are dominant in the dendrites. The non-equilibrium potential and anisot ropic growth at different reaction times result in morphological evolution . As the reaction proceeds , the dendritic structure transforms into thermodynamically stable hexagonal structure . It is believed that the global diffusion-limited aggregation as well as the locally oriented attachment of Ag grains are responsible for the formation of Ag dendrites.

关键词： silverdendrite morphology growth process mechanism

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The Models for Growth Process of Spruce-fir Forest

Improved length of calcium sulfate crystal seeds and whiskers via ball milling and hydration treatment

2012年计算机应用与系统建模国际会议

作者： Mengtao Zhang Xingang Kang Shuo Cai Department of Forestry Beijing Forestry University

Pass in the Wang Qing in Jilin province Jingouling forestry station to establish temporary study plot, carried on stem analysis, analysis spruce-fir wildwood growth process, discovered spruce-fir DBH for current annual increment at hit maximum for 50 years and 100 years, respectively is 1.14cm and *** of tree current annual increment at 30 years and 75 years maximum, respectively is 0.49m and 0.66m. In spruce-fir volume of wood growth process, volume of wood current annual increment is higher than average increment. The Quadratic can the good fitting spruce-fir height curve, secondly is Logarithmic, their correlation coefficient respectively is 0.985, 0.982 and 0.979, 0.935.

关键词： Spruce-fir wildwood growth process DBH Tree height Tree volume

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Chinese Journal of Chemical Engineering 2024年第7期71卷 102-109页

作者： Yuke Li Yuxin Liu Jizhen Huang Yi Mei Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Kunming University of Science and TechnologyKunming 650500China

Elucidating the effect of growth periods on the quality of calcium sulfate whiskers(CSWs)prepared from calcium sulfate dihydrate(DH)is ***,crystal seeds and whiskers were prepared from DH in a water–glycerol *** whiskers were obtained from crystal seeds prepared via hydration of DH for 30 s than via ball milling for 5 min followed by hydration for 20 *** attachment of cetyltrimethyl ammonium bromide and glycerol additives to the whisker tops promoted whisker *** whisker sponges exhibited good thermal barrier properties and compression cycle stability.

关键词： Hemihydrate gypsum whisker Hydration Ball milling/hydration Crystal seed growth process

Effect of Initial Oxide Film on the Formation and Performance of Plasma Electrolytic Oxidation Coating on 7075 Aluminum Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第9期35卷 1559-1571页

作者： Mingyu Zhu Yingwei Song Kaihui Dong Dayong Shan En-Hou Han Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

In the early stage of plasma electrolytic oxidation(PEO),the quick formation of the initial oxide film on the surface of the aluminum substrate is necessary for the subsequent discharge spark ***,the compactness of the initial oxide film greatly affects the quality of the PEO coating,but the related mechanisms are not investigated in *** this paper,the status of the initial oxide film was adjusted by adding the(NaPO)into the based electrolyte,and then the effect of initial oxide film on the formation of the PEO coating was *** and chemical composition were analyzed by scanning electron microscope,transmission electron microscopy and X-ray photoelectron *** compactness of the initial oxide film was characterized by Mott-Schottky *** corrosion resistance was measured by electrochemical impedance *** results show that the addition of(NaPO)can promote the co-deposition of phosphide compound into the initial oxide film and improve the film compactness,which is beneficial for the more uniform spark discharge in the later *** a result,the addition of(NaPO)is helpful to obtain PEO coating with better performance.

关键词： Aluminum alloys Plasma electrolytic oxidation Initial oxide film growth process Spark discharge Compactness

Controllable preparation and disorder-dependent photoluminescence of morphologically different C_(60) microcrystals

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Chinese Physics B 2021年第8期30卷 433-439页

作者： Wen Cui De-Jun Li Jin-Liang Guo Lang-Huan Zhao Bing-Bing Liu Shi-Shuai Sun College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China State Key Laboratory of Superhard Materials Jilin UniversityChangchun 130012China College of Science Tianjin University of TechnologyTianjin 300384China

Different C_(60) crystals were synthesized by precipitation from a mixture of the good solvent m-xylene and the poor solvent isopropyl *** samples were characterized by scanning electron microscopy(SEM),Raman spectroscopy,thermogravimetric analysis,and high resolution transmission electron microscope(HRTEM).We found that the morphologies and sizes of the samples could be controlled by adjusting the volume ratio between the good and poor ***,an unexpected short flower column-like crystal was synthesized at low ratios(from 1:6 to 1:12).Room temperature photoluminescence(PL)and HRTEM studies of the C_(60) crystal samples reveal that the PL efficiency of the crystals decreases with increasing crystalline order and that the disordered C_(60) crystals synthesized at the ratio of 1:2 show 10 times higher PL efficiency than that of pristine C_(60).The mechanism of the growth process of these C_(60) crystals was also studied by replacing the good solvents m-xylene with toluene and mesitylene.

关键词： C_(60)crystals morphology photoluminescence growth process

Simulating the heartwood formation process of Erythrophleum fordii in South China

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Journal of Forestry Research 2015年第4期26卷 1049-1055页

作者： Zhigang Zhao Junjie Guo Chunsheng Wang Jie Zeng Research Institute of Tropical Forestry CAF

We studied the formation of heartwood in Ery- throphleumfordii Oliv., an endangered rosewood species, by cross-section analysis on 52 stumps aged 28-57 years and arbitrarily sampled from natural forests in South China. Width and area of heartwood were positively correlated with age and xylem width （XW）, and were independent of annual radial growth. The proportions of heartwood and sapwood areas were equal at about 40 years. The heartwood formation pro- cess was simulated by linear regression of age and XW.

关键词： Erythrophleum fordii growth process Heartwood formation Heartwood width Rosewoodspecies