졸-겔법에 의한 나노기공성 세라믹 막의 제조 및 기체투과 특성

국문 초록 (Abstract)

본 연구에서 졸-겔 방법에 의하여 나노 기공을 가지는 세라믹막을 제조하여 단일 조성의 헬륨과 질소를 가지고 기체투과 실험을 수행하였다. 기공 크기 0.1 μm, 기공율 32%의 평막형 α-Al2O3 지지체를 제조하였으며, 지지체를 담지하여 코팅하는 방법으로 4nm의 기공 크기를 가지는 γ-Al2O3 중간층을 제조하였다. 실리카 졸은 TEOS의 산 촉매 가수분해와 축중합반응을 통하여 합성하였다. 막은 딥코팅과 소결과정을 거쳐 제조되었다. 졸-겔 법에 의해 합성된 세라믹 막을 통한 헬륨, 질소 투과 실험은 기체의 투과 특성을 파악하기 위하여 시행하였다. 질소에 대한 헬륨의 선택도는 100∼160 정도였으며 헬륨의 투과도는 303∼363 K의 온도 범위에서 10 -7 mol/m 2 ·s·Pa 정도였다.

다국어 초록 (Multilingual Abstract)

Nano-porous ceramic membranes was synthesized by the sol-gel method. Gas permeation of hydrogen and nitrogen was determined by single composition gas. Pore size 0.1 μm and porosity 32% of flat type α-Al2O3 substrate was manufactured. An intermediate γ-Al2O3 layer with pore size of 4 nm was formed by dip-coating. Polymeric silica sol was synthesized by acid catalyzed hydrolysis and condensation of tetra-ethyl-ortho-silicate. Supported membranes on alumina were prepared by dipping and calcining. He, N2 permeation experiments with nanoporous sol-gel modified supported ceramic membranes were peformed to determine the gas transport characteristics. He/N2 permselectivity around 100∼160 and helium permeation in the order of 10 -7 mol/m 2 ·s·Pa were measured in the temperature range of 303∼363 K.

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