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추상욱 ( Sang Wook Chu ),성아름 ( A Reum Sung ),박성수 ( Sung Soo Park ),하창식 ( Chang Sik Ha ) 한국접착및계면학회 2012 접착 및 계면 Vol.13 No.4
In the present study, we synthesized mesoporous silica hollow spheres with different wall thickness using polystyrene (PS) spheres as a structure template, tetraethoxysilane (TEOS) as a silica source, cetyltrimethylammonium bromide (CTAB) as a template. Particle size and dispersion of PS spheres were strongly depended on the concentration of surfactant in the aqueous solutions. The size of PS spheres was increased with decreasing concentration of surfactants. Dispersion of PS particle was improved when the surfactant concentration was lower than 0.5 g of surfactant. 본 연구에서는 중공형 나노 입자의 구조체가 되는 구형 폴리스티렌을 조절된 유화중합법으로 여러 크기의 구형 폴리스티렌을 제조하는 연구를 수행하였다. 유화중합에 사용되는 유화제의 농도를 조절하여 구형 폴리스티렌의 크기를 임의로 조절하였다. 이 폴리스티렌을 구조체로 이용하여 중공형 중간세공 실리카를 합성하였으며, 합성 과정 시 반응속도의 조절을 위해 에탄올을 넣어 실리카 전구체의 가수분해 속도를 조절하고, 실리카 전구체의 투여량을 조절하여 중공형 중간세공 실리카의 벽 두께를 조절하였다.
Effect of Alkali Metal Ions for Mesoporous Silica with Crystalline Mesopore Walls
박성수,추상욱,Liyi Shi,Shuai Yuan,하창식 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Mesoporous silica materials with crystalline walls and large pore size were produced via thermal treatment of SBA-15 using alkali and alkali earth metal ions (Na<SUP>+</SUP>, Li<SUP>+</SUP>, K<SUP>+</SUP>, and Ca<SUP>2+</SUP>). The effect of alkali metal ions was investigated with different ratios of alkali metal ions (Si/metal ion=2.1 to 80) and different temperature (500~700 ℃). The crystalline SiO₂ structures (i.e. cristobalite and quartz) in pore walls were produced in the range of Si/Na=2.1 to 40 at 700 ℃. With the increase of Na+ amount (i.e. Si/Na=80 to 40), mesopore size was increased remarkably from 48.3 Å to 983.7 Å. After thermal treatment at 700 ℃ of SBA-15 with Li<SUP>+</SUP>, K<SUP>+</SUP> and Ca<SUP>2+</SUP> ions (Si/metal ion=40), interestingly, the SBA-15 treated with Ca<SUP>2+</SUP> ions exhibited crystalline SiO₂ of quartz structure with pore diameter of 802.5 Å, whereas the SBA-15 treated with K+ and Li<SUP>+</SUP> ions didn’t have any crystalline SiO₂ structures in pore walls.