Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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The Influence of Heat Treatment of Nano-silica Particles on the Rheological Characteristics of Shear Thickening Fluids

나노 실리카 입자의 열처리가 전단농화유체의 유변학적 특성에 미치는 영향

  • Jaehyeong Lim (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Siti Zubaidah Binti Mat Daud (LANL-JBNU Engineering Institute-Korea, Jeonbuk National University) ;
  • Sang-Woo Kim (Department of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 임재형 (한국항공대학교, 항공우주 및 기계공학과) ;
  • ;
  • 김상우 (한국항공대학교, 항공우주 및 기계공학과)
  • Received : 2024.06.04
  • Accepted : 2024.09.13
  • Published : 2024.10.31
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Abstract

The objective of this study was to analyze influence of heat treatment of nano-silica particles on rheological characteristics of shear thickening fluid. Heat treatment was conducted for nano-silica particles with a diameter of 7 nm at temperatures of 120 ℃ and 180 ℃, followed by dispersion in polyethylene glycol as a solvent to fabricate shear thickening fluids with a concentration of 15 wt%. Subsequently, rheological characteristics were investigated using a rheometer. Findings revealed that shear thickening fluids produced with thermally treated nano-silica particles exhibited a notable increase in maximum viscosity, ranging from 8.96% to 213.17%, accompanied by a decrease in critical shear rate, ranging from 14.89% to 57.25%. Furthermore, it was confirmed that the shear thickening effect was enhanced up to 54.17%. These results are anticipated to facilitate the fabrication of high-performance shear thickening fluids with rheological properties that align with design requirements for application in aerospace structures.

본 연구에서는 나노 실리카 입자의 열처리가 전단농화유체의 유변학적 특성에 미치는 영향을 분석하였다. 7 nm 크기의 직경을 갖는 나노 실리카 입자에 열처리(120 ℃, 180 ℃)를 하였고, 용매인 폴리에틸렌글리콜에 분산시켜 15 wt% 농도를 갖는 전단농화유체를 제조하였다. 이후 레오미터를 통해 제조된 STF의 유변학적 특성을 분석하였다. 그 결과, 열처리된 나노 실리카 입자를 사용하여 제조된 전단농화유체의 최대 점도는 8.96 ~ 213.17% 증가하였고, 임계 전단 속도는 14.89 ~ 57.25% 감소하였다. 또한 전단농화 효과는 최대 54.17% 향상됨을 확인하였다. 이러한 결과는 향후 항공 구조물에 적용하기 위한 설계 요구조건에 부합하는 유변학적 특성을 지닌 고성능 전단농화유체 제조에 활용될 것으로 기대된다.

Keywords

Acknowledgement

이 연구는 2023년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구사업임(No.2022R1A6A1A03056784, No. 2022R1F1A1069025).

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