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2022 Vol.59, Issue 6 Preview Page

Research Paper

Synthesis and Dispersion Stability Assessment of a Silica Nanofluid for Improving CO2 Geological Storage Efficiency

CO2 지중저장 효율 향상을 위한 실리카 나노유체의 합성 및 분산안정성 평가 연구

Ingu Kang1
,
Chayoung Song1
,
Jeonghwan Lee1*
강 인구1
,
송 차영1
,
이 정환1*
1Department of Energy and Resources Engineering, Chonnam National University, Gwangju, Korea
1전남대학교 에너지자원공학과
*Corresponding Author
31 December 2022. pp. 684-692
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Abstract

In this study, nanofluids were synthesized using nanoparticles to improve the efficiency of CO2 geological storage, and visual observation, dynamic light scattering (DLS), fluid miscibility test (FMT), and transmission electron microscopy (TEM) were performed. Visual observation confirmed that the surface-modified SiO2 was not precipitated at 1 wt% or more and maintained a stable state. DLS and TEM measurements demonstrated that the average particle size at room temperature (25°C) and high temperature (100°C) was 100 nm or less, which is the definition of nanoparticles. After the FMT, the average particle size was 42.5 nm. The synthesized nanofluid was considered to have acquired dispersion stability under high-temperature and high-salinity reservoir conditions.

Keywords
Carbon capture and storage
Silica nanoparticles
Nanofluid synthesis
Dispersion stability test

본 연구에서는 이산화탄소 지중저장 효율향상을 위한 나노입자(nanoparticle)를 이용하여 나노유체(nanofluid)를 합성하였으며 육안관찰, 동적광산란법(dynamic light scattering, DLS), 유체혼화성시험(fluid miscibility test, FMT), 투과전자현미경(transmission electron microscope, TEM) 측정을 수행하여 유체 안정성을 평가하였다. 나노유체 육안 관찰 결과, 표면을 개질시킨 SiO2는 1 wt% 이상 조건에서 침전되지 않고 안정된 상태를 유지하였다. DLS 및 TEM 측정 결과, 상온(25°C)과 고온(100°C)조건에서 평균 입자크기는 나노입자의 정의인 100 nm 이하의 값으로 분산안정성을 확보한 것으로 판단된다. 또한, 유체혼화성 시험 수행 후 분산안정성을 확보한 나노유체의 입자크기는 평균 42.5 nm로 나타났다. 따라서 본 연구에서는 합성한 나노유체는 고온 ․ 고염의 저장지층 조건에서 분산안정성을 확보한 것으로 판단된다.

키워드
탄소 포집 및 저장
실리카 나노입자
나노 유체합성
분산안정성 평가
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 59
  • No :6
  • Pages :684-692
  • Received Date : 2022-10-28
  • Revised Date : 2022-12-14
  • Accepted Date : 2022-12-27
  • DOI :https://doi.org/10.32390/ksmer.2022.59.6.684
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