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High-Porosity Nanoporous Silica via Nanocasting Template of Hydrogels

Published online by Cambridge University Press:  26 February 2011

Takanori Nakamura ,
Ken-ichi Kurumada ,
Atsushi Suzuki ,
Naoki Umeda  and
Naoki Kishimoto
Takanori Nakamura
Affiliation:
taka311_style@yahoo.co.jp, Yokohama National University, Environment & Information Sciences, 79-7 Tokiwadai, Hodogayaku, Yokohama, Kanagawa, 240-8501, Japan, 045-339-3846, 045-339-3846
Ken-ichi Kurumada
Affiliation:
kurumada@ynu.ac.jp, Yokohama National University, Environment & Information Sciences, Japan
Atsushi Suzuki
Affiliation:
suzuki@post.post.me.ynu.ac.jp, Yokohama National University, Environment & Information Sciences, Japan
Naoki Umeda
Affiliation:
UMEDA.Naoki@nims.go.jp, National Institute of Materials Sciences, Japan
Naoki Kishimoto
Affiliation:
KISHIMOTO.Naoki@nims.go.jp, National Institute of Materials Sciences, Japan
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Abstract

High-porosity nanoporous silica was prepared by nanocasting method using N-isopropylacrylamide (NIPAm) cross-linked by N, N’-methelenbisacrylamide (BIS) as the templating agent. The obtained silica was a bulk silica with good transparency indicating that the characteristic length-scale of the obtained silica is in the nanoscopic scale being much smaller than that of the wave length of visible light. Nitrogen adsorption/desorption measurements revealed that the nano porosity increases up to 80% with the weight ratio of NIPAm to silica. The mean pore size (radius) also increased with the weight ratio in the region smaller than 10nm. TEM observation revealed that the nanoscopic network structure was replicated into tube-like nanopores randomly distributed in the silica matrix. The whole nanoscopic morphology of these tube-like nanopores was much like as the predicted for the cross-linked polymer.

Keywords

polymerstructuralcasting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 897: Symposium J – Biomemetic Polymers and Gels , 2005 , 0897-J06-06
Copyright
Copyright © Materials Research Society 2006

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References

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