TY - JOUR
T1 - Pore size distribution calculation from 1H NMR signal and N 2 adsorption-desorption techniques
AU - Hassan, Jamal
PY - 2012/9/15
Y1 - 2012/9/15
N2 - The pore size distribution (PSD) of nano-material MCM-41 is determined using two different approaches: N 2 adsorption-desorption and 1H NMR signal of water confined in silica nano-pores of MCM-41. The first approach is based on the recently modified Kelvin equation [J.V. Rocha, D. Barrera, K. Sapag, Top. Catal. 54(2011) 121-134] which deals with the known underestimation in pore size distribution for the mesoporous materials such as MCM-41 by introducing a correction factor to the classical Kelvin equation. The second method employs the Gibbs-Thompson equation, using NMR, for melting point depression of liquid in confined geometries. The result shows that both approaches give similar pore size distribution to some extent, and also the NMR technique can be considered as an alternative direct method to obtain quantitative results especially for mesoporous materials. The pore diameter estimated for the nano-material used in this study was about 35 and 38 Å for the modified Kelvin and NMR methods respectively. A comparison between these methods and the classical Kelvin equation is also presented.
AB - The pore size distribution (PSD) of nano-material MCM-41 is determined using two different approaches: N 2 adsorption-desorption and 1H NMR signal of water confined in silica nano-pores of MCM-41. The first approach is based on the recently modified Kelvin equation [J.V. Rocha, D. Barrera, K. Sapag, Top. Catal. 54(2011) 121-134] which deals with the known underestimation in pore size distribution for the mesoporous materials such as MCM-41 by introducing a correction factor to the classical Kelvin equation. The second method employs the Gibbs-Thompson equation, using NMR, for melting point depression of liquid in confined geometries. The result shows that both approaches give similar pore size distribution to some extent, and also the NMR technique can be considered as an alternative direct method to obtain quantitative results especially for mesoporous materials. The pore diameter estimated for the nano-material used in this study was about 35 and 38 Å for the modified Kelvin and NMR methods respectively. A comparison between these methods and the classical Kelvin equation is also presented.
KW - Kelvin equation
KW - MCM-41
KW - Nitrogen absorption-desorption
KW - NMR
KW - Pore size distribution
UR - http://www.scopus.com/inward/record.url?scp=84863987400&partnerID=8YFLogxK
U2 - 10.1016/j.physb.2012.05.063
DO - 10.1016/j.physb.2012.05.063
M3 - Article
AN - SCOPUS:84863987400
SN - 0921-4526
VL - 407
SP - 3797
EP - 3801
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 18
ER -