[논문]화학적 증기 증착 방법을 통해 제조한 소수성 폴리디메틸실록산 박막: 수처리로의 응용

한상욱; 김광대; 김주환; 엄성현; 김영독

doi:10.14478/ace.2016.1129

화학적 증기 증착 방법을 통해 제조한 소수성 폴리디메틸실록산 박막: 수처리로의 응용
Hydrophobic Polydimethylsiloxane Thin Films Prepared by Chemical Vapor Deposition: Application in Water Purification 원문보기

공업화학 = Applied chemistry for engineering, v.28 no.1, 2017년, pp.1 - 7

한상욱 (성균관대학교 화학과) , 김광대 (신우산업 주식회사 중앙연구소) , 김주환 (신우산업 주식회사 중앙연구소) , 엄성현 (고등기술연구원 신소재공정센터 청정소재공정팀) , 김영독 (성균관대학교 화학과)

초록
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폴리디메틸실록산(PDMS)은 화학적 증기 증착 방법을 통해 다양한 물질에 5 nm 두께 이하의 박막 형태로 증착될 수 있다. $SiO_2$, $TiO_2$, ZnO, C, Ni 및 NiO와 같은 다양한 종류의 나노입자 표면에도 PDMS 박막은 증기 증착을 통해 고르게 형성될 수 있으며, PDMS가 증착된 표면은 완벽한 소수성을 갖게 된다. 이 소수성 박막은 안정성이 높아 산, 염기 및 자외선 노출 시에도 잘 분해되지 않으며, 또한 PDMS로 코팅된 나노입자는 다양한 환경 분야에 응용될 수 있다. PDMS 코팅된 소수성 $SiO_2$ 입자는 기름/물 혼합액에서 기름과 선택적으로 반응하고, 기름 유출 사고 시 유류 확산을 억제할 수 있으며, 유출된 기름을 물에서 물리적으로 쉽게 분리할 수 있게 해준다. PDMS 코팅된 $TiO_2$를 진공 상태에서 열처리 할 경우 $TiO_2$ 표면은 완전하게 친수성으로 개질되며, 이때 $TiO_2$가 가시광선을 흡수하여 반응할 수 있게 하는 산소 빈자리 또한 발생하게 된다. PDMS 코팅 후 열처리한 $TiO_2$는 아무 처리하지 않은 $TiO_2$에 비해 가시광 하에서 수중의 유기 염료를 분해하는데 더 뛰어난 광촉매 활성을 보인다. 우리는 해당 연구에서 제시하는 간단한 PDMS 박막 코팅 방법이 다양한 환경 과학 및 공학 분야에서 응용될 수 있음을 소개하고자 한다.

Abstract ▼ AI-Helper

Polydimethylsiloxane (PDMS) can be deposited on various substrates using chemical vapor deposition process, which results in the formation of PDMS thin films with thickness below 5 nm. PDMS layers can be evenly deposited on surfaces of nanoparticles composed of various chemical compositions such as $SiO_2$, $TiO_2$, ZnO, C, Ni, and NiO, and the PDMS-coated surface becomes completely hydrophobic. These hydrophobic layers are highly resistant towards degradation under acidic and basic environments and UV-exposures. Nanoparticles coated with PDMS can be used in various environmental applications: hydrophobic silica nanoparticles can selectively interact with oil from oil/water mixture, suppressing fast diffusion of spill-oil on water and allowing more facile physical separation of spill-oil from the water. Upon heat-treatments of PDMS-coated $TiO_2$ under vacuum conditions, $TiO_2$ surface becomes completely hydrophilic, accompanying formation oxygen vacancies responsible for visible-light absorption. The post-annealed $PDMS-TiO_2$ shows enhanced photocatalytic activity with respect to the bare $TiO_2$ for decomposition of organic dyes in water under visible light illumination. We show that the simple PDMS-coating process presented here can be useful in a variety of field of environmental science and technology.

주제어

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가설 설정

h-TiO₂ was prepared by PDMS-coating and 800 ℃-annealing under vacuum. (b) Results of photocatalysis experiments of bare and h-TiO₂ are compared.

제안 방법

IR spectra were recorded using 64 scans with a 4 cm^-1 resolution. Morphological images of samples were obtained using scanning electron microscopy (SEM, JEOL, JSM7001F), atomic force microscopy (AFM, NT-MDT, NTEGRA spectra) and transmission electron microscopy (TEM, JEOL, JEM2100F).

이론/모형

) and electro-optics comprised of a digital camera connected to a computer (software Attension Theta). For the characterization of functional groups of sample surfaces, a Fourier-transformed infrared spectrometer (FT-IR, BRUKER, Optics/vertex 70) was used. IR spectra were recorded using 64 scans with a 4 cm^-1 resolution.

성능/효과

Summary of the stability test of PDMS-layer on nanoparticles. (a) Stearic acid and PDMS layers on Ni were exposed acidic condition (pH = 2.5) and the water contact angle was measured as a function of exposing time to acidic environments. (b) Stearic acid and PDMS layer on TiO₂were exposed UV light with maximum intensity at 254 nm wavelength.

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