Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of Surface Modification of Calcium Carbonate Nanoparticles by Octyltrimethoxysilane on the Stability of Emulsion and Foam

실란 커플링제 옥틸트리메톡시실란에 의해 표면 개질된 탄산칼슘 나노입자가 에멀젼 및 기포 안정성에 미치는 영향

  • Lim, Jong Choo (Department of Chemical and Biochemical Engineering, Dongguk University) ;
  • Park, Ki Ho (Department of Chemical and Biochemical Engineering, Dongguk University) ;
  • Lee, Jeong Min (Department of Chemical and Biochemical Engineering, Dongguk University) ;
  • Shin, Hee Dong (Department of Chemical and Biochemical Engineering, Dongguk University)
  • 임종주 (동국대학교 화학공학과) ;
  • 박기호 (동국대학교 화학공학과) ;
  • 이정민 (동국대학교 화학공학과) ;
  • 신희동 (동국대학교 화학공학과)
  • Received : 2022.06.27
  • Accepted : 2022.07.07
  • Published : 2022.08.10
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Abstract

In this study, the surface modification of calcium carbonate (CaCO3) nanoparticles by a silane coupling agent, octyltrimethoxysilane (OTMS), was investigated and characterized using Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) analysis. Both floating tests and contact angle measurements were also conducted to study the effect of OTMS concentration on the hydrophobicity of CaCO3 nanoparticles. It was found that the active ratio for the CaCO3 nanoparticles modified by 1 wt% of OTMS was 97.0 ± 0.5%, indicating that OTMS is a very effective silane coupling agent in enhancing the hydrophobicity of the CaCO3 nanoparticle surface. The most stable foam was generated with 1 wt% of CaCO3 nanoparticles in aqueous solutions at 1 wt% of OTMS, where the contact angle of water was found to be 91.8 ± 0.7°. It was also found that the most stable emulsion drops were formed at the same OTMS concentration. These results suggest that CaCO3 nanoparticles modified by a silane coupling agent OTMS are a powerful candidate for a foam stabilizer or an emulsifier in many industrial applications.

본 연구에서는 실란 커플링제 옥틸트리메톡시실란(octyltrimethoxysilane, OTMS)을 사용하여 친수성 탄산칼슘(CaCO3) 나노입자의 표면을 개질하였으며, OTMS에 의한 CaCO3 나노입자의 표면 개질은 FT-IR, DSC, XRD XPS 및 TGA 분석을 통하여 확인하였다. 또한 부유 시험과 접촉각 측정을 통하여 OTMS 농도가 CaCO3 나노입자의 표면 소수성 변화에 미치는 영향에 관하여 살펴보았다. 부유 시험 결과에 따르면 1 wt% OTMS 농도 조건에서 측정한 active ratio 값이 97.0 ± 0.5%로서, OTMS가 CaCO3 나노입자 표면을 매우 효율적으로 소수화 개질하는 실란 커플링제임을 알 수 있었다. 또한 OTMS로 개질된 CaCO3 나노입자 1 wt%를 함유하는 수용액에 대한 기포 안정성 측정 결과, OTMS 농도가 1 wt%인 조건에서 가장 안정한 기포가 생성되며, 접촉각은 91.8 ± 0.7°임을 확인하였다. 또한 동일한 1 wt% OTMS 농도 조건에서 에멀젼 입자 크기가 가장 작은 안정한 상태의 에멀젼이 형성됨을 확인하였다. 이러한 결과들은 OTMS로 개질된 CaCO3 나노입자가 다양한 산업 응용 분야에서 기포 안정화제 및 에멀젼 유화제로서 적용이 가능함을 의미하는 것이다.

Keywords

Acknowledgement

본 연구는 산업통상자원부 소재부품기술개발-소재부품패키지형 (과제번호 20011027, 반도체 디스플레이 공정용 불소계 계면활성제 제조기술 개발)의 지원을 받아 수행되었으며, 이에 감사드립니다.

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