Recently, aqueous-based environment-friendly layer-by-layer (LbL) assembly method has received great interest in the fabrication of superhydrophobic surface. In this study, LbL film consists of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA). PAA mixture of average molecular weights of 100000 and 1500 g/mol was used to prepare the LbL film. The films were treated in acid and perfluorooctanoic acid (PFOA) solution to induce porous structure and hydrophobicity. Effect of PAA mixing ratio and acid treatment condition on surface morphology and water contact angle (WCA) was studied. When acid treatment pH was 2.4, roughness and WCA decreased with the increase of 1500 g/mol PAA. However, when pH was 2.0, roughness and WCA showed a maximum at the 1500 g/mol PAA range of 25-75%.

최근, 수용액 기반의 다층박막적층법(layer-by-layer assembly method)을 이용한 초발수 표면의 구현이 관심을 받고 있다. 본 연구에서는 poly(allylamine hydrochloride)(PAH)와 poly(acrylic acid)(PAA)를 이용하여 다층박막을 제조하였다. PAA는 평균 분자량 100000과 1500 g/mol를 여러 비율로 혼합하여 다층박막을 제조하였다. 제조된 다층박막을 산처리 및 perfluorooctanoic acid(PFOA) 처리하여 다공성 구조와 발수성을 유도하였다. PAA 혼합 비율, pH와 시간 등의 산처리 조건에 따른 표면 형태와 물접촉각을 관찰하였다. 산처리 pH 2.4인 경우, 1500 g/mol PAA 함량이 증가함에 따라 표면 조도와 접촉각이 감소하였고, pH 2.0인 경우, 1500 g/mol PAA의 함량이 25-50% 영역에서 표면조도와 접촉각이 최대값을 나타내었다.

Keywords: layer-by-layer, acid treatment, porous, surface morphology, hydrophobic