Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Preparation of MWNTs Functionalized with Silica by Covalent Bonding and Their Application to Shear Thickening Fluids

실리카가 공유결합된 MWNT의 제조 및 전단농화유체에의 응용

  • Hwang, Hye Na (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kim, Young Ho (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 황혜나 (숭실대학교 유기신소재.파이버공학과) ;
  • 김영호 (숭실대학교 유기신소재.파이버공학과)
  • Received : 2012.09.05
  • Accepted : 2012.10.02
  • Published : 2012.10.31
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Abstract

In order to increase the dispersibility of MWNT in silica/PEG shear thickening fluid (STF), silica-coated MWNTs (Si-MWNTs) through covalent bonding were prepared and characterized. Amino group-introduced MWNT with a nitrogen atom content of 20 wt% was prepared first by reacting acid-treated MWNT and ethylene diamine, and then various amounts of silica were formed on the surface of MWNT initiated from the amino groups by using a sol-gel method. The silica formation on the MWNT surface was confirmed by FE-SEM, TEM, EA, and FTIR spectroscopy. When 3 wt% of pristine MWNT was added to the silica/PEG suspension, the shear thickening property was not observed and the MWNT was not dispersed well in the suspension. On the other hand, the suspension containing 3 wt% of Si-MWNT showed similar shear thickening behavior to that of simple silica/PEG. The critical shear-thickening point of silica/Si-MWNT suspension in PEG moved to a lower shear rate with increasing Si-MWNT content.

Keywords

Acknowledgement

Supported by : 한국연구재단

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