Processing of porous ceramic spheres by pseudo-double-emulsion method

被引:26
作者
Lee, JS [1 ]
Park, JK [1 ]
机构
[1] Hanyang Univ, Dept Geoenvironm Syst Engn, Seongdong Gu, Seoul 133791, South Korea
关键词
porous; ceramic sphere; gelcasting; double-emulsion;
D O I
10.1016/S0272-8842(02)00115-3
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A process for the fabrication of porous ceramic spheres for microorganism carriers is described. A new fabrication method for the process was developed using simple gelcasting and bubble-in-water-in-oil type of pseudo-double-emulsion. The globules, consisting of a foamed mullite suspension, were dispersed and consolidated in spherical shape in liquid paraffin as gelation progressed. The green spheres were pyrolysed at 600 degreesC and sintered at 1500 degreesC. The influence of surfactants, extension ratio, and impeller revolution rate on the process and characteristics of the spheres was investigated. The sphere size was in the range 1-5 mm and determined directed by impeller revolution rate. The macropore size in the case of the anionic surfactant was less than that for the cationic surfactant. The inner macropores were interconnected and extended to the external surface. The macroporosity of macropores, in the range 65-79%, increased with extension ratio. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码:271 / 278
页数:8
相关论文
共 22 条
[1]   OPEN-PORE SINTERED GLASS AS A HIGH-EFFICIENCY SUPPORT MEDIUM IN BIOREACTORS - NEW RESULTS AND LONG-TERM EXPERIENCES ACHIEVED IN HIGH-RATE ANAEROBIC-DIGESTION [J].
BREITENBUCHER, K ;
SIEGL, M ;
KNUPFER, A ;
RADKE, M .
WATER SCIENCE AND TECHNOLOGY, 1990, 22 (1-2) :25-32
[2]  
CHARACKLIS WG, 1989, BIOFILMS
[3]   Determination of the internal morphology of poly (D,L-lactide) microspheres using stereological methods [J].
Ehtezazi, T ;
Washington, C ;
Melia, CD .
JOURNAL OF CONTROLLED RELEASE, 1999, 57 (03) :301-314
[4]   PROCESSING AND PROPERTIES OF CELLULAR SILICA SYNTHESIZED BY FOAMING SOL GELS [J].
FUJIU, T ;
MESSING, GL ;
HUEBNER, W .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1990, 73 (01) :85-90
[5]   Modification of porous silica with activated carbon and its application for fixation of yeasts [J].
Furuta, S ;
Katsuki, H ;
Komarneni, S .
JOURNAL OF POROUS MATERIALS, 2001, 8 (01) :43-48
[6]   Double emulsions - Scope, limitations and new achievements [J].
Garti, N .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 1997, 123 :233-246
[7]   Wastewater treatment using activated sludge entrapped in polyethylene glycol prepolymer [J].
Hashimoto, N ;
Sumino, T .
JOURNAL OF FERMENTATION AND BIOENGINEERING, 1998, 86 (04) :424-426
[8]   LARGE-SCALE ANAEROBIC-AEROBIC TREATMENT OF COMPLEX INDUSTRIAL-WASTE WATER USING BIOFILM REACTORS [J].
HEIJNEN, JJ ;
MULDER, A ;
WELTEVREDE, R ;
HOLS, J ;
VANLEEUWEN, HLJM .
WATER SCIENCE AND TECHNOLOGY, 1991, 23 (7-9) :1427-1436
[9]   Testing of biological aerated filter (BAF) media [J].
Kent, TD ;
Fitzpatrick, CSB ;
Williams, SC .
WATER SCIENCE AND TECHNOLOGY, 1996, 34 (3-4) :363-370
[10]   Fabrication of graded porous ceramics using alumina-carbon powder mixtures [J].
Maca, K ;
Dobsak, P ;
Boccaccini, AR .
CERAMICS INTERNATIONAL, 2001, 27 (05) :577-584