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Oriented Growth of PZT thick film embedded with PZT nanoparticles 被引量:3
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作者 段中夏 袁杰 +2 位作者 赵全亮 路冉 曹茂盛 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第2期232-236,共5页
This paper reports that dense and crack-free (100) oriented lead zirconate titanate (Pb( Zr0. 52Ti0. 48 )O3, PZT) thick film embedded with PZT nanopartieles has been successfully fabricated on Pt/Cr/SiO2/Si subs... This paper reports that dense and crack-free (100) oriented lead zirconate titanate (Pb( Zr0. 52Ti0. 48 )O3, PZT) thick film embedded with PZT nanopartieles has been successfully fabricated on Pt/Cr/SiO2/Si substrate by using PT transition layer and PVP additive. The thick film possesses single-phase perovskite structure and perfectly (100) oriented. The (100) orientation degree of the PZT films strongly depended on annealing time and for the 4μm-thick PZT film which was annealed at 700℃ for 5 min is the largest. The (100) orientation degree of the PZT thick film gradually strengthen along with the thickness of film decreasing. The 3μm-thick PZT thick film which was annealed at 700℃ for 5 rain has the strongest (100) orientation degree, which is 82. 3%. 展开更多
关键词 PZT SOL-GEL thick film oriented growth
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Grain oriented growth and properties of ultra-high temperature CaBi_2Nb_2O_9 piezoelectric ceramics 被引量:2
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作者 TIAN XiaoXia QU ShaoBo WANG BinKe ZHANG WuSen ZHAO JianFeng 《Science China Chemistry》 SCIE EI CAS 2011年第10期1552-1557,共6页
CaBi2Nb2O9 (CBNO) ceramics was prepared at 1050℃ using regular flake-like CBNO powders as the precursor, and synthe-sized by the molten salts synthesis method. The tropism degree and microstructure of the ceramics we... CaBi2Nb2O9 (CBNO) ceramics was prepared at 1050℃ using regular flake-like CBNO powders as the precursor, and synthe-sized by the molten salts synthesis method. The tropism degree and microstructure of the ceramics were analyzed, and the die-lectric, ferroelectric and piezoelectric properties were characterized. Compared with conventional methods, the properties of CBNO ceramics by the new preparation method were found to be better. As the sinter temperature decreases, the grain growth becomes regular with textured features. The polarization process becomes easy to be realized at room temperature. Moreover, the dielectric loss decreases and the piezoelectric constant increases significantly. 展开更多
关键词 CaBi2Nb2O9 ultra-high temperature grain oriented growth PERFORMANCE
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Modeling of equiaxed and columnar dendritic growth of magnesium alloy 被引量:6
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作者 吴孟武 熊守美 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第9期2212-2219,共8页
Based on the cellular automaton (CA) method, a numerical model was developed to simulate the dendritic growth of magnesium alloy with HCP crystal structure. The growth kinetics was calculated from the complete solut... Based on the cellular automaton (CA) method, a numerical model was developed to simulate the dendritic growth of magnesium alloy with HCP crystal structure. The growth kinetics was calculated from the complete solution of the transport equations. By defining a special neighborhood configuration with the square CA cell, and using a set of capturing rules which were proposed by BELTRAN-SANCHEZ and STEFANESCU for the dendritic growth of cubic crystal metals during solidification, modeling of dendritic growth of magnesium alloy with different growth orientations was achieved. Simulation of equiaxed dendritic growth and columnar dendritic growth under directional solidification was carried out, and validation was performed by comparing the simulated results with the experimental results and those in the previously published works. 展开更多
关键词 magnesium alloy dendritic growth cellular automaton method growth orientation
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Fabrication and Magnetic Properties of Highly Oriented ZnO:Eu Films by Sol-Gel Process 被引量:1
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作者 车平 孟健 +1 位作者 任丽荣 郭林 《Journal of Rare Earths》 SCIE EI CAS CSCD 2006年第z2期298-301,共4页
A series of Eu-doped ZnO films were prepared by a sol-gel method. Precursor and films were characterized by thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscope (SEM), UV-vis spectra, as we... A series of Eu-doped ZnO films were prepared by a sol-gel method. Precursor and films were characterized by thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscope (SEM), UV-vis spectra, as well as the magnetism measurement. The wurtzite structure of obtained films presents an extreme high c-orientation character. The film susceptibility resembles a Curie-Weiss behavior at high temperature, and presents an obvious enhancement at low temperature, indicating the presence of antiferromagnetic interactions in the Zn0.9Eu0.1O films. 展开更多
关键词 zinc oxide film europium ion oriented growth magnetic property rare earths
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Study on Characteristics of Crystal Growth of NdFeB Cast Alloys
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作者 李波 郭炳麟 +2 位作者 王东玲 刘涛 喻晓军 《Journal of Rare Earths》 SCIE EI CAS CSCD 2004年第2期220-222,共3页
The characteristic of crystal growth of NdFeB cast alloys was studied. It is found that the crystal growth orientation of conventional ingots is along <410> or <411>. As the cooling rate increases, the cry... The characteristic of crystal growth of NdFeB cast alloys was studied. It is found that the crystal growth orientation of conventional ingots is along <410> or <411>. As the cooling rate increases, the crystallization orientation changes from a axis to c axis, along which the grain is easy to be magnetized. Meanwhile, by analyzing the change of crystallization orientation, the influence on the property of magnets was discussed. 展开更多
关键词 metal materials NdFeB cast alloys strip casting cooling rate crystal growth orientation rare earths
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Orientational growth behavior and mechanism of delta(δ)phase precipitation in cold-rolled Inconel 718 alloy during heat treatment 被引量:1
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作者 Neng-yong Ye Guang-liang Zhang +3 位作者 Tian-yue Huang Ming Cheng Shi-hong Zhang Lei Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2024年第1期264-274,共11页
Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation ... Due to the important role ofδphase's quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components,it is necessary to renew insights into the effect of cold deformation on theδphase precipitation,especially on the morphology evolution.Therefore,the nucleation and growth behavior ofδphase in cold-rolled Inconel 718 alloy during aging were investigated.The results show that the precipitation rate and volume fraction ofδphase increase with increasing the cold rolling reduction from 10%to 50%.The volume fraction ofδphase reaches equilibrium after 5 h,remaining at 5.98%,6.52%,and 6.79%under different rolling reductions(10%,30%,and 50%),respectively.The nucleation ofδphase mainly occurs on different sites(grain boundaries,new twin boundaries and old twin boundaries)under 10%rolling reduction,whileδphase mainly nucleates on the new grain boundaries of static recrystallization due to 50%rolling reduction.And the growth ofδphase undergoes a process of alternate orientation growth from spherical(nucleation)→short rod(longitudinal orientation growth)→short rod(radial orientation growth)→dynamic equilib-rium.Under 10%rolling reduction,δphase tends to grow into the matrix,while under 50%rolling reduction,the orientation grows faster and is easily affected by the grain boundary curvature. 展开更多
关键词 Inconel 718 alloy Cold rolling δphase Orientation growth Morphology evolution
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Preparation of Manganese Oxide Nanobelts 被引量:1
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作者 JisenWANG JinquanSUN +1 位作者 YingBAO XiufangBIAN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第5期489-491,共3页
Oriented nanobelts of manganese oxide have been firstly and successfully prepared by a microemulsion technique under controlled circumstances. The samples were characterized by X-ray diffraction (XRD), transmission el... Oriented nanobelts of manganese oxide have been firstly and successfully prepared by a microemulsion technique under controlled circumstances. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM). Influences of sodium chloride and annealed temperature on the synthesis of Mn3O4 nanobelts were investigated. It was found that NaCI is the key factor to synthesize oriented Mn3O4 nanobelts and 827 K is optimum temperature to produce fine nanobelts. Oriented growth mechanism of Mn3O4 nanobelts was discussed. 展开更多
关键词 Microemulsion technique oriented nanobelts oriented growth mechanism
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科学发展观的哲学解读 被引量:2
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作者 赵磊 《齐鲁学刊》 北大核心 2004年第6期140-142,共3页
科学发展观是对现代经济社会发展新要求的反映。协调发展,人与自然的二元本体是它的的立足点;以人为本,各发展要素的相互兼容是它的价值诉求;持续发展,近利与远效的互补是它的动态过程;科技支持,权衡正负效应的经济性是它的原动力。
关键词 科学发展观 协调发展 以人为本 持续发展
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Relationship between solid/liquid interface and crystal orientation for pure magnesium solidified in fashion of cellular crystal 被引量:2
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作者 常国威 陈淑英 +2 位作者 周聪 岳旭东 齐义辉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第2期289-293,共5页
The relationship between the solid/liquid interface and the crystal orientation for pure magnesium,which grows in fashion of cellular crystal in unidirectional solidification,was investigated.The results show that the... The relationship between the solid/liquid interface and the crystal orientation for pure magnesium,which grows in fashion of cellular crystal in unidirectional solidification,was investigated.The results show that the energy of the solid/liquid interface is the lowest during cellular crystal growth of pure magnesium;and the solid/liquid interface is covered by the basal face{0001}and by the crystal face made up of three atoms located at the orientation{0001}0100and two atoms located at the inner of magnesium crystal cell.The strongest bond is formed in the direction of 61.9°viating from the growth direction,and the second strong bond is formed in the directions of 8.5°d 47.7°espectively,deviating from the growth direction.The angle between the basal face{0001} and the growth direction is 61.9°he theoretical analysis results are basically consistent with the experimental results from SUSUMU et al. 展开更多
关键词 magnesium solidification process crystal growth crystal orientation
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Superaligned carbon nanotubes guide oriented cell growth and promote electrophysiological homogeneity for synthetic cardiac tissues 被引量:2
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《Science Foundation in China》 CAS 2017年第4期25-,共1页
With the support by the National Natural Science Foundation of China,the research team led by Professor Li Yigang(李毅刚)at Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine and Professor ... With the support by the National Natural Science Foundation of China,the research team led by Professor Li Yigang(李毅刚)at Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine and Professor Peng Huisheng(彭慧胜)at Fudan University presented a new type of 展开更多
关键词 Superaligned carbon nanotubes guide oriented cell growth and promote electrophysiological homogeneity for synthetic cardiac tissues
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Growth of ZnO self-converted 2D nanosheet zeolitic imidazolate framework membranes by an ammoniaassisted strategy 被引量:6
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作者 Yujia Li Lu Lin +5 位作者 Min Tu Pei Nian Ashlee J. Howarth Omar K. Farha Jieshan Qiu Xiongfu Zhang 《Nano Research》 SCIE EI CAS CSCD 2018年第4期1850-1860,共11页
Shaping crystalline porous materials such as metal organic frameworks (MOFs) and zeolites into two-dimensional (2D) nanosheet forms is highly desirable for developing high-performance molecular sieving membranes. ... Shaping crystalline porous materials such as metal organic frameworks (MOFs) and zeolites into two-dimensional (2D) nanosheet forms is highly desirable for developing high-performance molecular sieving membranes. However, conventional exfoliation-deposition is complex and challenging for the large-scale fabrication of nanosheet MOF tubular membranes. Here, for the first time, we report a direct growth technique by ZnO self-conversion and ammonia assistance to fabricate zeolitic imidazolate framework (ZIF) membranes consisting of 2D nanosheets on porous hollow fiber substrates; the membranes are suitable for large-scale industrial gas separation processes. The proposed fabrication process for ZIF nanosheet membranes is based on the localized self-conversion of a pre-deposited thin layer of ZnO in a ligand solution containing ammonium hydroxide as a modulator. The resulting ZIF 2D nanosheet tubular membrane is highly oriented and only 50 nm in thickness. It exhibits excellent molecular sieving performance, with high H2 permeance and selectivity for H2/CO2 separation. This technique shows great promise in MOF nanosheet membrane fabrication for large-scale molecular sieving applications. 展开更多
关键词 NANOSHEET nanosheet membrane metal organic framework membrane oriented growth gas separation
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Microstructure Evolution and Growth Orientation of Directionally Solidified Mg–4 wt% Zn Alloy with Different Growth Rates 被引量:3
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作者 Hong-Min Jia Xiao-Hui Feng Yuan-Sheng Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第12期1185-1191,共7页
The microstructure evolution and growth orientation of directionally solidified Mg-4 wt% Zn alloy in the growth rate range from 20 to 200μm/s were investigated. A typical cellular structure was observed with a growth... The microstructure evolution and growth orientation of directionally solidified Mg-4 wt% Zn alloy in the growth rate range from 20 to 200μm/s were investigated. A typical cellular structure was observed with a growth rate of 20 μm/s, and the cellular spacing was 115 μm. When the growth rate increased to 60 μm/s, cellular structure with some developed perturbations was obtained and the cellular spacing was 145 μm, suggesting that the cell-to-dendrite transition happened at the growth rate lower than 60 μm/s. As the growth rate further increased, the microstructure was dendritic and the primary dendritic arm spacing decreased. The relationship between the primary dendritic arm spacings and the growth rates was in good agreement with Trivedi model during dendritic growth. Besides, X-ray diffraction and transmission electron microscopy analyses showed that the growth direction of directionally solidified Mg-4 wt% Zn alloy was (1120) lay in {0002} crystal plane, and the preferred orientation was explained with the lattice vibration model for one-dimensional monatomic chain. 展开更多
关键词 Directional solidification Mg-Zn alloy Microstructure evolution Primary dendritic arm spacing growth orientation
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Ultrahigh flux of graphene oxide membrane modified with orientated growth of MOFs for rejection of dves and oil-water separation
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作者 Meng Zhu Yucheng Liu +7 位作者 Mingyan Chen Dong Gan Maoren Wang Haojie Zeng Maoqi Liao Jie Chen Wenwen Tu Wen Niu 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第10期2683-2688,共6页
Metal organic frameworks(MOFs)has broad application prospect in separation,catalysis,and adsorption.By a facile green method,we successfully fabricated prGO@cHKUST-1 composite membrane with the modification of dopamin... Metal organic frameworks(MOFs)has broad application prospect in separation,catalysis,and adsorption.By a facile green method,we successfully fabricated prGO@cHKUST-1 composite membrane with the modification of dopamine and orientated growth of MOFs.Mg/AI-layered double hydroxides(Mg/Al-LDHs)was used as a modulator to obtain cubic HKUST-1(cHKUST-1)with excellent morphology and special properties.Scanning Electron Microscopy(SEM),X-ray diffraction(XRD),and Fourier transform infrared spectroscopy(FTIR)etc.characte rization illustrated successful synthesis of cHKUST-1 and composite membranes.Cubic HKUST-1 can tune the inter-layer spacing of graphene oxide(GO)leading increase in hydrophilicity and flux of the membrane.Meanwhile,the reduction effect of PDA and intercalation effect of MOFs could change the stacked way of GO layers,forming several fuzzy pores and more active sites on membrane surface.The prGO@cHKUST-1 membrane has an excellent rejection for methylene blue(MB)(99.5%)and Congo red(CR)(71.2%).Moreover,the modified membra ne exhibited 10 and 5 times higher permeation flux than that of original GO membrane and prGO membrane,respectively.Thus,using orientated growth of MOFs to synthesize GO based composite membrane will provide useful insights in ultrahigh permeation flux membranes of dye and oil-water emulsion separation. 展开更多
关键词 GO composite membrane Metal organic frameworks Mg/Al-LDHs Orientated growth Ultra-high flux
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Growth orientation and superconducting properties of YBa_2Cu_3O_(7-δ) films prepared by the low-fluorine sol-gel process
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作者 雷黎 赵高扬 +1 位作者 徐慧 赵娟娟 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2010年第8期35-41,共7页
YBa_2Cu_3O_(7-δ)(YBCO) films were deposited on(100)-oriented LaAlO_3(LAO) single crystal substrates by the dip-coating process using low-fluorine solution.Their microstructures were characterized with the aid... YBa_2Cu_3O_(7-δ)(YBCO) films were deposited on(100)-oriented LaAlO_3(LAO) single crystal substrates by the dip-coating process using low-fluorine solution.Their microstructures were characterized with the aid of X-ray diffractometry,scanning electron microscopy and high-resolution transmission electron microscopy.Their superconducting properties were measured by the standard four-probe method.The experiment results show that the film obtained under high enough humidity conditions exhibits better c-axis texture and superconducting properties than the film under a relatively low humidity conditions.Based on the classical nucleation and chemical reaction thermodynamics theory, the underlying crystalline and growth mechanisms of YBCO films under certain humidity conditions are explained in combination with our experimental results.It is suggested that the unreacted intermediate phases such as BaF_2 and CuO aggregated in the YBCO grain boundary will cause lattice distortion in the YBCO matrix and further induce the formation of a-axis oriented YBCO grains as crystallization proceeds.Therefore,it is believed that the relative content of water vapor within the heat-treatment atmosphere plays quite an important role in the preparation of c-axis oriented YBCO film with good superconducting properties. 展开更多
关键词 YBCO films low-fluorine process growth orientation SOL-GEL
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Conductive PS inverse opals for regulating proliferation and differentiation of neural stem cells 被引量:1
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作者 Yangnan Hu Han Zhang +11 位作者 Hao Wei Menghui Liao Xiaoyan Chen Jiayue Xing Lian Duan Cuntu Cheng Weicheng Lu Xuechun Yang Peina Wu Huan Wang Jingdun Xie Renjie Chai 《Engineered Regeneration》 2023年第2期214-221,共8页
The development of neural tissue engineering has brought new hope to the treatment of spinal cord injury(SCI).Up to date,various scaffolds have been developed to induce the oriented growth and arrangement of nerves to... The development of neural tissue engineering has brought new hope to the treatment of spinal cord injury(SCI).Up to date,various scaffolds have been developed to induce the oriented growth and arrangement of nerves to facilitate the repair after injury.In this work,a conductive and anisotropic inverse opal substrate was presented by modifying polystyrene(PS)inverse opal films with carbon nanotubes and then stretching them to varying degrees.The film had good biocompatibility,and neural stem cells(NSCs)grown on the film displayed good orientation along the stretching direction.In addition,benefiting from the conductivity and anisotropy of the film,NSCs differentiated into neurons significantly.These results suggest that the conductive and anisotropic PS inverse opal substrates possess value in nerve tissue engineering regeneration. 展开更多
关键词 Nerve regeneration Inverse opal Neural stem cells oriented growth Tissue engineering
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Germinant ZnO nanorods as a charge-selective layer in organic solar cells 被引量:1
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作者 Kunsik An Jaehoon Kim +5 位作者 Mohammad Afsar Uddin Seunghyun Rhee Hyeok Kim Kyung-Tae Kang Han Young Woo Changhee Lee 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第20期89-94,共6页
A facile method was introduced and demonstrated to synthesize zinc oxide(ZnO) nanorods(NRs) as an electron transporting layer(ETL) for organic solar cells(OSCs).Hydrothermal synthesis of the NRs showed a constant grow... A facile method was introduced and demonstrated to synthesize zinc oxide(ZnO) nanorods(NRs) as an electron transporting layer(ETL) for organic solar cells(OSCs).Hydrothermal synthesis of the NRs showed a constant growth rate of 5.5 nm min-1 from germination to sub-micrometer length.The properties were characterized using scanning electron microscopy(SEM),transmission electron microscopy(TEM),absorption spectrophotometry and so on.Based on these measurements,the germinant growth mechanism and its corresponding orientation characteristics were investigated.As an ETL of the OSCs,ZnO NRs enhance the charge extraction from the active layer due to their increased interfacial surface area,but there is an optimal length because of the shunt path formation and UV absorption of long ZnO NRs.As a re sult,the OSC with the ZnO NRs as ETL shows power conversion efficiency(PCE) up to 6.2%.The J-V characteristics and incident photon-to-current conversion efficiency(IPCE) measurement also reveal that the efficiency enhancement is an assembly of individual results from optical,physical and electrical characteristic of the ZnO NRs. 展开更多
关键词 ZnO nanorods Solar cells SELF-ASSEMBLY oriented growth mechanism Hydrothermal synthesis
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Interaction of straight chain alcohol vapors with self-assembled MOF film by surface plasmon resonance sensing and imaging 被引量:1
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作者 Jun Chen Ji-Ying Xu Yi Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2013年第7期651-653,共3页
Interaction of straight chain alcohol vapors with MOF-199-functionalized films was studied by SPR. The signals had linear relationships with the concentration of alcohols over a wide range from 0 to 70% (v/v) and we... Interaction of straight chain alcohol vapors with MOF-199-functionalized films was studied by SPR. The signals had linear relationships with the concentration of alcohols over a wide range from 0 to 70% (v/v) and were reversible in proportional to the chain length, with R2 all above 0.99. 展开更多
关键词 Layer by layer self-assemble of MOF oriented growth Alcohol vapors detection Surface plasmon resonance or SPR
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Effects of Sn-doping on morphology and optical properties of CdTe polycrystalline films 被引量:1
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作者 李锦 杨林钰 +2 位作者 简基康 邹华 孙言飞 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2009年第11期10-13,共4页
Sn-doped CdTe polycrystalline films were successfully deposited on ITO glass substrates by close space sublimation. The effects of Sn-doping on the microstructure, surface morphology, and optical properties of polycry... Sn-doped CdTe polycrystalline films were successfully deposited on ITO glass substrates by close space sublimation. The effects of Sn-doping on the microstructure, surface morphology, and optical properties of polycrys- talline films were studied using X-ray diffraction, scanning electron microscopy, and ultraviolet-visible spectrophotometry, respectively. The results show that the lower molar ratio of Sn and CdTe conduces to a strongly preferential orientation of (111) in films and a larger grain size, which indicates that the crystallinity of films can be improved by appropriate Sn-doping. As the molar ratio of Sn and CdTe increases, the preferential orientation of (111) in films becomes weaker, the grain size becomes smaller, and the crystal boundary becomes indistinct, which indicates that the crystallization growth of films is incomplete. However, as the Sn content increases, optical absorption becomes stronger in the visible region. In summary, a strongly preferential orientation of (111) in films and a larger grain size can be obtained by appropriate Sn-doping (molar ratio of Sn : CdTe = 0.06 : 1), while the film retains a relatively high optical absorption in the visible region. However, Sn-doping has no obvious influence on the energy gap of CdTe films. 展开更多
关键词 CdTe polycrystalline films Sn-doping preferential orientation growth MORPHOLOGY optical properties close space sublimation
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Preparation and permeability of ZSM-35 zeolite membranes on porous stainless steel tubes
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作者 ZHU Gang WANG Jinqu +2 位作者 ZHANG Yan LU Jinming XIU Jinghai 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2007年第3期217-220,共4页
ZSM-35 zeolite membranes were prepared on porous stainless steel tubes with silica sol and tetraethoxysi-lane as silica source,and with 1-butylamine and ethylenedi-amine as templates,respectively.The characterization ... ZSM-35 zeolite membranes were prepared on porous stainless steel tubes with silica sol and tetraethoxysi-lane as silica source,and with 1-butylamine and ethylenedi-amine as templates,respectively.The characterization of X-ray diffraction(XRD)and scanning electron microscopy(SEM)showed that the membranes prepared with ethylene-diamine as the template displayed growth orientation with their crystal planes(h00)parallel to the support surface.The single-component permeability tests of H2,N2 and C3H8 showed that the membranes synthesized with ethylene-diamine as the template,compared with those with 1-butylamine as the template,showed relatively higher permeation rates and ideal separation factors,and above their corresponding ideal Knudsen diffusion factors,which might be attributed to the different growth orientation of zeolite membranes synthesized with different templates. 展开更多
关键词 ZSM-35 zeolite membrane porous stainless steel gas permeation growth orientation
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