期刊文献+
共找到13篇文章
< 1 >
每页显示 20 50 100
Porous bulk metallic glass fabricated by powder hot pressing 被引量:4
1
作者 Keqiang Qiu1), Bo Yu2), and Yinglei Ren1) 1) School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China 2) Shenyang Research Institute of Foundry, Shenyang 110022, China 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2007年第S1期59-63,共5页
A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the su- perplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerat... A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the su- perplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), X-ray diffraction (XRD) and dif- ferential scanning calorimetry (DSC) were employed to characterize the morphologies of foaming structure, the crystallization and the percentage of crystallization of the as-produced porous BMG. The results suggested that the formation of porous structure by su- perplastic forming process is feasible. Good bonding effect was observed between amorphous powder particles. Less than 6.5% of crystalline phases were formed during hot pressing, and less than 5.5% of residual salt was enclosed in the foam. To remove any re- sidual salt particles, salt preforms with three-dimensional network and good connectivity is necessary. 展开更多
关键词 porous bulk metallic glass hot pressing placeholders superplastic forming
下载PDF
Effect of Thermal Treatment and Acid Leaching Process on Pore Characteristics of Nanometer Porous Glass 被引量:2
2
作者 韩建军 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第1期129-131,共3页
Porous glass was prepared by thermally treating sodium borosilicate glass for different time, the effect of thermal treatment on pore size distribution was discussed and the pore size of the prepared porous glass was ... Porous glass was prepared by thermally treating sodium borosilicate glass for different time, the effect of thermal treatment on pore size distribution was discussed and the pore size of the prepared porous glass was measured by scanning electron microscopy (SEM) and differential thermal analysis (DTA). The results show that the optimum porous glass with an average diameter of 80 nm can be prepared by thermal treatment at 600℃ for 12 h and then acid treatment for 12 h in 2 mol·L^-1 hydrochloric acid solution. 展开更多
关键词 porous glass thermal treatment sodium borosilicate glass phase-separate
下载PDF
Optical Characteristics of Porous Glasses Matrix and Its Light-conducted Mechanism 被引量:1
3
作者 郭丽萍 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第4期34-36,共3页
The optical properties of matrix of porous glasses and phase-separated glasses were investigated by visible spectroscopy and infrared spectroscopy. The experimental results show that, both the porous glasses and phase... The optical properties of matrix of porous glasses and phase-separated glasses were investigated by visible spectroscopy and infrared spectroscopy. The experimental results show that, both the porous glasses and phase-separated glasses have very good light transmission in visible light region that wavelenth is longer than 560nm. The micropores of porous glasses and the boron-rich phase of phase-separated glasses have strong Rayleigh scatter effects on the visible light, the largest scatter occurrs at 360-370nm; the thicker the glasses, the larger the light scattering. Thus, the pore size distribution and the size of heterogeneous micro zone in boron-rich phase of phase-separated glasses can be measured. After coupled into porours glasses, the most intense absorption of hydrated ions of 〔Co(H 2O) 6〕 2+ shifts from 508nm to 515nm. The production of the most intense absorption and the red shift were owed to Jahn-Teller effect of octahedral field formed by six H 2O molecular and perturbation effect resulted by microporous of porous glasses for its physics-chemical circumstance. As a result, the porous glasses are perfect optical function materials in visible region, which can be assembled by chemical method. 展开更多
关键词 porous glasses phase separation photoelectric materials MATRIX
下载PDF
The Dynamics of Acid Treatment in the Preparation of Porous Glass
4
作者 郭丽萍 LIYing-xia +1 位作者 CHENYong-xi LEIJia-heng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第4期10-13,共4页
The phase-separation glasses with composition of Na 2O(9.0)B 2O 3(25.0)-SiO 2(66.0)(in mole ratio)were leached with hydrochloric acid,and porous glasses were prepared.The dynamics of the acid treatment was investi... The phase-separation glasses with composition of Na 2O(9.0)B 2O 3(25.0)-SiO 2(66.0)(in mole ratio)were leached with hydrochloric acid,and porous glasses were prepared.The dynamics of the acid treatment was investigated.The effects of treatment time,temperature and acid concentration on the acid treatment process were studied using HCl as treatment solution.The dynamics equation and apparent activation energy obtained in acid treatment process were dw/dt=a/2t and E=57.74 kJ·mol -1,respectively.The constants of the reaction rate at different temperatures were calculated.On the basis of experimental data the mechanism of acid treatment process and the source of swollen stress,which was the main stress during treatment process,were discussed. 展开更多
关键词 porous glass phase-separation glass dynamics of reaction DIFFUSION
下载PDF
FABRICATION OF POROUS GLASS FIBRES AND ITS CHARGING CHARACTERISTICS
5
作者 郭丽萍 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2000年第4期12-17,共6页
Glass fibers, cc diameter of 350 mum to 500 mum, were made of glasses with an initial composition of 66. 55iO(2) - 25B(2)O(2) - 8. 5 Na2O. Being heated at 580 C for 24 hours and leached in HCl solution at 90 C: for 12... Glass fibers, cc diameter of 350 mum to 500 mum, were made of glasses with an initial composition of 66. 55iO(2) - 25B(2)O(2) - 8. 5 Na2O. Being heated at 580 C for 24 hours and leached in HCl solution at 90 C: for 12 hours, the glass fibers were made into porous glass fibers, pore size in the range 25nm to 35nm. The influence of the glass composition cold condition on glass phase separation Is discussed. The transparence of the porous glass fibers before and after being charged with sensitive reagents and the anti-resolve characteristics of sensitized reagent charged were also studied. The results have shown that the transparence of porous glass fibers after being charged with sensitive reagents and the anti-resolve characteristics of sensitive reagents charged in the materials were very well. By combining with special sensitive reagents, the porous glass fibers could be made into a series of fiber optic chemical sensors with different characteristics. 展开更多
关键词 porous glass fiber glass phase separation charging characteristics
下载PDF
Fabrication of Porous Bulk Metallic Glass
6
作者 Keqiang QIU+ and Yinglei REN School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110023, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第6期788-790,共3页
An open-cell porous bulk metallic glass (BMG) with a diameter of at least 6 mm was fabricated by using an U-turn quartz tube and infiltration casting around soluble NaCI placeholders. The pore formation and glassy s... An open-cell porous bulk metallic glass (BMG) with a diameter of at least 6 mm was fabricated by using an U-turn quartz tube and infiltration casting around soluble NaCI placeholders. The pore formation and glassy structure were examined by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the pores or cells are connected to each other and the specimen is composed of a mostly glassy phase. This paper provides a suitable method for fabrication of porous BMG and BMG with larger size in diameter. 展开更多
关键词 porous bulk metallic glass U-turn quartz tube Infiltration casting
下载PDF
CONTROL OF POLYMER PARTICLE SIZE USING POROUS GLASS MEMBRANE EMULSIFICATION A REVIEW 被引量:4
7
作者 Guanghui Ma State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, P. R. China Tel: 0086-10-82627072, ghma@home.ipe.ac.cn 《China Particuology》 SCIE EI CAS CSCD 2003年第3期105-114,共10页
Much attention has in recent years been paid to fine applications of polymer particles, e.g., carrier for enzyme, separation media for protein, DNA and cell, and carrier for drug in Drug Delivery System (DDS). Control... Much attention has in recent years been paid to fine applications of polymer particles, e.g., carrier for enzyme, separation media for protein, DNA and cell, and carrier for drug in Drug Delivery System (DDS). Control of polymer particle size is especially important in such fine applications. For instance, when the particles are used as a carrier of anti-cancer agents, the locations of particles containing anti-cancer agents also depend on the size of the particles. In this paper, various techniques of controlling polymer particle size are described, with emphasis on Shirasu Porous Glass (SPG) membrane emulsification, as carried out in our research group. 展开更多
关键词 PARTICLES POLYMERIZATION EMULSIFICATION Shirasu porous glass membrane MICROCAPSULE
原文传递
SYNTHESIS OF STYRENIC TONER PARTICLES BY SPG EMULSIFICATION TECHNIQUE 被引量:2
8
作者 Suda Kiatkamjornwong Roongkan Nuisin +1 位作者 Guang-HuiMa Shinzo Omi 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2000年第4期309-322,共14页
This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate)copolymers by a Shirasu porous glass membrane(SPG)emulsification technique followed by suspension... This research studied the initiator efficiency for producing polymeric particles of poly(styrene-co-methyl methacrylate)copolymers by a Shirasu porous glass membrane(SPG)emulsification technique followed by suspension copolymerization.BPO,ADVN,and AIBN were used as initiators and we found that BPO is the most suitable initiator.Copolymers for various feed ratios of styrene/methyl methacrylate were thus synthesized by benzoyl peroxide,and their copolymer particle size,molecular weight distribution and pat-ride size distribution were characterized.Then n-BMA or 2-EHMA was added as the third monomer to decrease the terpolymer glass transition temperature.This article describes the preparation technique,recipes and polymerization conditions for producing both copolymer and terpolymer particles,particle size changes,the corresponding particle morphologies and glass transition temperatures. 展开更多
关键词 Shirasu porous glass EMULSIFICATION n-butyl methacrylate 2-ethylhexyl methacrylate toner binder
下载PDF
Liquid Phase Hydrogenation of Benzalacet0phen0ne:Effect of Solvent,Catalyst Support,Catalytic M etal and Reaction Conditions 被引量:1
9
作者 Achim STOLLE Christine SCHM?GER +3 位作者 Bernd ONDRUSCHKA Werner BONRATH Thomas F.KELLER Klaus D.JANDT 《催化学报》 SCIE EI CAS CSCD 北大核心 2011年第8期1312-1322,共11页
Innovative catalysts based on a "porous glass" support material were developed and investigated for the reduction of benzalace-tophenone. The easy preparation conditions and possibility to use different meta... Innovative catalysts based on a "porous glass" support material were developed and investigated for the reduction of benzalace-tophenone. The easy preparation conditions and possibility to use different metals (e.g. Pd, Pt, Rh) for impregnation gave a broad variety of these catalysts. Hydrogenation experiments with these supported catalysts were carried out under different hydrogen pressures and temperatures. Porous glass catalysts with Pd as the active component gave chemoselective hydrogenation of benzalacetophenone, while Pt- and Rh-catalysts tended to further reduce the carbonyl group, especially at elevated hydrogen pressures and temperatures. Kinetic analysis of the reactions revealed these had zero order kinetics, which was independent of the type of porous glass support and solvent used. 展开更多
关键词 CHALCONE HYDROGENATION porous glass supported catalyst
下载PDF
STUDY ON PREPARATION OF UNIFORM POLYSTYRENE HOLLOW PARTICLES
10
作者 Ma Guanghui and Omi Shinzo (Tokyo University of Agriculture and Technology, Nakamachi 2-24-16, Koganei, Tokyo 184-8588, Japan) 《化工学报》 EI CAS CSCD 北大核心 2000年第S1期35-38,共4页
Uniform polystyrene hollow particles were prepared successfully by employing SPG (Shirasu porous glass) emulsification technique. The oil phase composed of monomer [styrene (St) and N,N’-dimethylamino ethylmethacryla... Uniform polystyrene hollow particles were prepared successfully by employing SPG (Shirasu porous glass) emulsification technique. The oil phase composed of monomer [styrene (St) and N,N’-dimethylamino ethylmethacrylate (DMAEMA)], hexadecane (HD) and initiator was permeated through the uniform pores of SPG membrane into the aqueous phase (containing stabilizer, emulsifier and water-soluble inhibitor ) by a gas pressure to form uniform droplets. The droplets were then polymerized at 70℃. It was found that the hollow particles were obtained by adding a small amount of DMAEMA into the oil phase and by using NaNo2 as the water-soluble inhibitor, while only one-hole particles were obtained without adding DMAEMA, or when using diaminophenylene (DAP) or hydroquinone (HQ) as the inhibitor. The formation mechanism was discussed by the view of interfacial tensions between polymer and aqueous phase, HD and aqueous phase, and HD and polymer. Further more, it was found that hollow particles can be obtained even when DMAEMA content in the oil phase was very low, by increasing HD to high value. 展开更多
关键词 Shirasu porous glass EMULSIFICATION hollow particle POLYSTYRENE N N’-dimethylmino ethylmethacrylate
下载PDF
Effect of interface carbonization on dielectric properties of potassium nitrate nanocomposite based on porous glasses
11
作者 A.Molokov A.Sysoeva +3 位作者 A.Naberezhnov R.Kumar E.Koroleva S.Vakhrushev 《Journal of Advanced Dielectrics》 CAS 2022年第4期42-48,共7页
Dielectric properties and structure of pure and carbon-modified nanocomposites on the base of porous glasses with an average pore diameter of 6 nm(PG6)with embedded KNO3 have been studied at the temperature diapason o... Dielectric properties and structure of pure and carbon-modified nanocomposites on the base of porous glasses with an average pore diameter of 6 nm(PG6)with embedded KNO3 have been studied at the temperature diapason of 300-430 K and at fre-quencies of 0.1-3×10^(6) Hz on cooling.X-ray diffraction studies of these samples have shown,that in modified and unmodified composites there is a mixture of the low-temperature paraelectric phase(α-phase)and the ferroelectricγ-phase.In modified composites,a decrease in permittivity and conductivity is observed.Dielectric response has been analyzed in the framework of modern theoretical models.Two relaxation processes have been identified and their origin has been determined.It has been found that the main contribution to the dielectric response of nanocomposite material PG6+KNO3 is provided by charge polarization on interfaces,which can be governed by modifying the inner pore surfaces.DC-conductivity of both composites has been estimated and the activation energies have been determined.Activation energy change observed in a vicinity of 360 K is attributed to the phase transformation and the appearance of KNO3α-phase. 展开更多
关键词 NANOCOMPOSITES FERROELECTRICS potassium nitrate porous glasses dielectric properties
原文传递
ELECTRICAL CONDUCTIVITY AND PHASE TRANSITIONS IN KDP-AND ADP-POROUS GLASS NANOCOMPOSITES
12
作者 A.SIERADZKI A.CIZMAN +2 位作者 R.POPRAWSKI T.MARCINISZYN E.RYSIAKIEWICZ-PASEK 《Journal of Advanced Dielectrics》 CAS 2011年第3期337-343,共7页
The results of dielectric and dilatometric measurements of ADP and KDP-porous glass composites are presented.We stated on dilatometric studies that in ADP-porous glass nanocomposites the phase transition temperature d... The results of dielectric and dilatometric measurements of ADP and KDP-porous glass composites are presented.We stated on dilatometric studies that in ADP-porous glass nanocomposites the phase transition temperature decreases with decreasing of average size of pores.The negative jump of volume at phase transition region in ADP-porous glasses is observed.It was found that for KDP embedded into porous glasses nonmonotonous dependence of phase transition temperature on pores sizes occurs.The conductivity of ADP/KDP composites is significantly higher than in bulk crystals.The obtained values of activation energies are typical for proton movement. 展开更多
关键词 Electrical conductivity KDP ADP porous glass
原文传递
Synthesis and Applications of Porous Glass
13
作者 ZHU Benbi ZHANG Zhijian +4 位作者 ZHANG Wang WU Yu ZHANG Jianzhong IMRAN Zada ZHANG Di 《Journal of Shanghai Jiaotong university(Science)》 EI 2019年第6期681-698,共18页
Porous materials have received significant attention for catalyst,electrochemical energy storage,sensing and compound capture.Large surface area and connected inner channel make porous materials outstanding in the app... Porous materials have received significant attention for catalyst,electrochemical energy storage,sensing and compound capture.Large surface area and connected inner channel make porous materials outstanding in the applications of catalyst,batteries and biomedicine.Glass is a traditional material and has the advantages of high stability and other physical properties.By combining the advantages of porous materials and glass,porous glass has been researched widely and applied to many leading-edge fields,such as batteries and sensors.This review presents common methods for synthesizing porous glass,including phase separation process(PSP),direct leaching process(DLP)of acid,sintering and so on.Three main steps for fabrication of each process are concluded.The recent applications are support,capturer and matter transport,and they are highlighted in this review.Future directions for preparing these materials are also discussed. 展开更多
关键词 porous glass ordered structure hierarchical structure
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部