Development of Certified Reference Materials for Specific Surface Area

비표면적 인증표준물질 개발

  • Received : 2004.07.29
  • Accepted : 2005.01.27
  • Published : 2005.02.25

Abstract

Understandings of adsorption characteristic of interface are very important in several advanced materials processes, related to NT and BT technology. Volumetric gas adsorption method, suitable for absolute measurements, is regarded as the standardized measurement technique for specific surface area. In order to verify the reliability of commercial equipments, certified reference materials (called CRM) of specific surface area are developed and evaluated its uncertainty factors by standard equipment which has traceability to SI units. Specific surface areas of developed materials are $10.72{\pm}0.46m^2g^{-1}$ for silicon nitride powders and $149.50{\pm}3.44m^2g^{-1}$ for alumina. These disseminations of CRMs would result in improved reliability chains in industrial processes, and lead eventually to contribution to productivity improvement, quality management, safety evaluation, and possibly to new material development.

NT, BT 산업의 발달에 함께 계면에서의 흡착특성의 파악은 신물질의 개발이나 공정의 첨단화에서 꼭 필요한 과제가 되고 있다. 체적식 가스흡착방법은 정량적인 흡착량의 측정이 가능하여 비표면적의 표준측정장비로 인식되고 있다. 상용 비표면적 측정장비의 신뢰성 검증을 위하여 인증표준물질을 개발하였고, SI 단위에 소급성을 유지하는 표준장비에 의해 불확도가 평가되었다. 제작된 인증물질은 비표면적이 $10.72{\pm}0.46m^2g^{-1}$ 인 silicon nitride 분말과 $149.50{\pm}3.44m^2g^{-1}$ 인 alumina 분말이다. 이런 검증된 인증물질의 보급은 산업계에 신뢰성 있는 비표면적 측정결과를 줌으로서, 일관성 있는 공정운용에 의한 품질관리, 생산성 향상, 안정성 판단 및 신제품 개발 등에 기여할 것이다.

Keywords

References

  1. J. G. Dash, 'Films on Solid Surfaces', Academic Press, New York and London(1975)
  2. S. J. Gregg and K. S. W. Sing, 'Adsorption, Surface Area and Porosity', Academic Press, New York and London(1982)
  3. Motoyuki Suzuki, 'Adsorption Engineering' Kodanaha Press, Tokyo(1990)
  4. Z. Mursic, M. Y. M. Lee, D. E. Johnson, and J. Z. Larese, Rev. Sci. Instrum., 67(5), 1886(1996) https://doi.org/10.1063/1.1146993
  5. KS L ISO 18757 'Fine ceramics-Determination of the specific surface area of ceramic powders by gas adsorption using the BET method'
  6. ISO 9277 'Determination of the specific surface area of solid by gas adsorption using the BET method'
  7. ASTM C 1251 'Determination of the specific surfacearea of advanced ceramic materials by gas adsorption'
  8. KRISS-99-070-SP, 'KRISS Guide to the Expression of Uncertainty in Measurement', 한국표준과학연구원(1999).
  9. T. Takaishi and Y. Sensui, Trans. Faraday Soc. 59, 2503(1963) https://doi.org/10.1039/tf9635902503