jp410367v_si_001.pdf (149.64 kB)
Adhesion of Gels by Silica Particle
journal contribution
posted on 2014-03-06, 00:00 authored by Hidekazu Abe, Yusuke Hara, Shingo Maeda, Shuji HashimotoIn this study, a method for achieving
adhesion between two positively
charged gels with high mechanical strength was developed. By utilizing
a silica particle dispersion as a binder, the gels easily adhered
to each other and remained stable for up to 11 days when immersed
in aqueous solution. The adhesion force between the two positively
charged semi-interpenetrating network gels with the silica particle
was measured to be up to approximately 20 kPa, which is around 10
times larger than that with a charged polymer-rich liquid as a cross-linker
(approximately 1.5 kPa). It was demonstrated that the adhesion force
was a result of two types of interactions: an electrostatic attractive
force between the cationic gel surface and hydrogen bonding among
the silica particles. In addition, it was shown that the adhesion
force was dependent on solution pH, which was attributed to changes
in the charge of the silica particles.