Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Crystal structural property and chemical bonding nature of cellulose nanocrystal formed by high-pressure homogenizer

고압 균질기를 이용하여 형성된 셀룰로오스 나노결정의 결정 구조 및 화학적 결합 특성 연구

  • Chel-Jong Choi (School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center (SPRC), Jeonbuk National University) ;
  • Nae-Man Park (Hyper-Reality Metaverse Research Laboratory, Electronics and Telecommunications Research Institute (ETRI)) ;
  • Kyu-Hwan Shim (School of Semiconductor and Chemical Engineering, Semiconductor Physics Research Center (SPRC), Jeonbuk National University)
  • 최철종 (전북대학교 반도체화학공학부 반도체물성연구소) ;
  • 박래만 (한국전자통신연구원 초현실 메타버스 연구실) ;
  • 심규환 (전북대학교 반도체화학공학부 반도체물성연구소)
  • Received : 2024.06.07
  • Accepted : 2024.06.13
  • Published : 2024.06.30
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Abstract

We investigated the crystal structural property and chemical bonding nature of cellulose nanocrystal extracted directly from cotton cellulose using high-pressure homogenizer. The nanowire-like cellulose nanocrystals were randomly distributed in the form of a dense mesh. Based on calculating the interplanar distance of the Bragg-diffracted crystal plane observed through X-ray diffraction (XRD) analysis, it was found that the cellulose nanocrystals formed by high-pressure homogenizer had a monoclinc crystal structure, corresponding to the cellulose Iβ sub-polymorph. Solid-state nuclear magnetic resonance (NMR) analysis for the quantitatively evaluation of the amorphous region in cellulose nanocrystals revealed that the crystallinity index of cellulose nanocrystals was calculated to be 53.06 %. The O/C ratio of the surface of cellulose nanocrystal was estimated to be 0.82. Further analysis showed that chemical bonds of C-C bond or C-H bond, C-O bond, O-C-O bond or C=O bond, and O-C=O bond were the main chemical bonding states of the cellulose nanocrystal surface.

고압 균질기를 이용하여 면 셀룰로오스 원료로부터 직접 셀룰로오스 나노결정을 추출하고 이에 대한 결정 구조 및 화학적 결합 상태에 대한 연구를 수행하였다. 형성된 셀룰로오스 나노결정은 나노와이어 형태의 구조적 특성을 가지며, 조밀한 구조의 메쉬 형태로 분포하였다. X-ray diffraction (XRD) 분석을 통해 관찰된 Bragg 결정면의 면간거리 계산을 통해 고압 균질기로부터 추출된 셀룰로오스 나노결정이 셀룰로오스 Iβ 하부 다형체인 monoclinc 결정구조를 갖음을 확인하였다. 셀룰로오스 나노결정에 포함된 비정질 영역을 정량적으로 평가하기 위한 Solid-state nuclear magnetic resonance(NMR) 분석 결과 셀룰로오스 나노결정의 결정화도 지수는 5 3.06 %로 계산되었다. 형성된 셀룰로오스 나노결정 표면의 O/C ratio는 0.82로 계산되었으며, C-C 결합 혹은 C-H 결합, C-O 결합, O-C-O 결합 혹은 C=O 결합, O-C=O 결합의 화학적 결합이 셀룰로오스 나노결정 표면의 주요 화학적 상태임을 알 수 있었다.

Keywords

Acknowledgement

본 연구는 한국전자통신연구원의 "셀룰로오스의 반도체 소재화 원천연구" 과제의 지원으로 수행되었습니다.

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