Effect of Electrolyte on Preperation of Porous Alumina Membrane by Anodic Oxidation

양극산화에 의한 다공성 알루미나 막의 제조시 전해질의 영향

  • Lee, Chang-Woo (Department of Chemical Engineering, College of Engineering, Dankook University) ;
  • Hahm, Yeong-Min (Department of Chemical Engineering, College of Engineering, Dankook University) ;
  • Kang, Hyun-Seop (School of Chemical, Polymer & Biological Engineering, In-Ha University) ;
  • Chang, Yoon-Ho (School of Chemical, Polymer & Biological Engineering, In-Ha University)
  • 이창우 (단국대학교 공과대학 화학공학과) ;
  • 함영민 (단국대학교 공과대학 화학공학과) ;
  • 강현섭 (인하대학교 공과대학 화학공학과) ;
  • 장윤호 (인하대학교 공과대학 화학공학과)
  • Received : 1998.07.14
  • Accepted : 1998.09.15
  • Published : 1998.12.10

Abstract

The porous alumina membrane was prepared from aluminum metal(99.8%) by anodic oxidation using DC power supply of constant current mode in aqueous solution of sulfuric, oxalic, phosphoric and chromic acid. Pore size and distribution, membrane thickness, morphology and crystal structure were examined with several anodizing conditions : reaction temperature, electrolyte concentration, current density and electrolyte type. It was found that ultrafiltration membrane was fabricated in electrolyte of sulfuric, and oxalic acid. On the other hand, microfiltration membrane was fabricated in electrolyte of phosphoric, and chromic acid. Also, it was shown that crystal structure of porous alumina membrane prepared in sulfuric, oxalic, and phosphoric acid was amorphous, whereas porous alumina membrane prepared in chromic acid had ${\gamma}$ type of crystal structure.

Acknowledgement

Supported by : 한국과학재단

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