새글 논문 해외 국제전문학술지(SCI급) (공동) Effect of hydrophobic character of diammonium-capping agents for the synthesis of nanocrystalline MOR zeolite
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2025-11
- 저자명 Gayoung Lee, Jong Yeon Lim, Jeong-Chul Kim, Changbum Jo*
- 학술지명 Microporous and Mesoporous Materials
- 발행처명 Elsevier
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
- 원문 링크 https://www.sciencedirect.com/science/article/pii/S1387181125002999
홈페이지논문 초록 (Abstract)
Multiammonium surfactants are known to act as effective capping agents in the synthesis of zeolite nanoparticles. While the attractive interactions between ammonium head groups and zeolite surfaces play a critical role in capping, the influence of the surfactant tail structures remains poorly understood. In this study, a series of diammonium surfactants with different tail lengths (i.e., CnH2n+1-N+(CH3)2-C6H12-N+(CH3)2-CmH2m+1, 4 ≤ n, m ≤ 22) were systematically tested to investigate the effect of hydrophobic character on the morphology of mordenite (MOR) zeolite nanocrystals. Capping efficiency was assessed using X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. The results showed that surfactants with a moderate hydrophilic/hydrophobic balance—quantified by the carbon-to-nitrogen (C/N+) ratio—exhibited the highest capping efficiency, resulting in smaller particle sizes and larger external surface areas. Furthermore, non-Gemini surfactants (i.e., n ≠ m) demonstrated significantly enhanced capping efficiency, compared to symmetric Gemini surfactants (i.e., n = m). These findings offer valuable insights into the molecular design of surfactants in the controlled synthesis of zeolite nanoparticles.