Article

Preparation of meso-macroporous TiO2 ceramic based on membrane jet-flow emulsification--influences of triblock copolymers on the processes.

State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China.
Journal of Colloid and Interface Science (impact factor: 3.07). 06/2009; 333(1):324-8. DOI:10.1016/j.jcis.2008.11.057 pp.324-8
Source: PubMed

ABSTRACT Meso-macroporous TiO(2) ceramics were obtained based on a two-stage ceramic membrane jet-flow emulsification and the influences of the triblock copolymers on the process are discussed in this study. The two alpha-Al(2)O(3) ceramic membranes with average pore sizes of 0.5 and 1.6 microm were used to control the structure of nonaqueous emulsions. Polyethylene oxide (PEO)-polypropylene oxide (PPO)-polyethylene oxide (PEO) with relative molecular masses of 5800 and 2900 were used as emulsifiers. Monodispersed emulsions with the same average droplet size of 2.6 microm were prepared using the two emulsifiers. However, ordered macroporous structures could only be obtained when the PEO-PPO-PEO of 5800 was used as emulsifier because the lower interfacial tension leans to produce the more stable nonaqueous emulsion. Moreover, the mesoporous structures of 5.4 nm and 7.1 nm could be obtained by the self-assembling block copolymers.

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Keywords

average droplet size
 
average pore sizes
 
emulsifiers
 
influences
 
lower interfacial tension leans
 
macroporous structures
 
mesoporous structures
 
PEO
 
PEO)-polypropylene oxide
 
PEO-PPO-PEO
 
Polyethylene oxide
 
PPO)-polyethylene oxide
 
self-assembling block copolymers
 
triblock copolymers
 
two emulsifiers
 
two-stage ceramic membrane jet-flow emulsification