We used a thermally reversible hybrid gel made of billions of physically jam-packed swollen thermally sensitivepoly(N-isopropyl-acrylamide) chemical microgels. Laser light scattering study on a series of such hybrid gels formed atdifferent gelling rates and temperatures revealed that the position-dependence of the scattering speckle pattern(staticnonergodicity) came from large voids formed during the sol-gel transition. With a proper preparation
such a nonergodicity could be completely removed indicating that the static nonergodicity generally observed in a gel is not intrinsic
but comes from the clustering"island" structure formed during the gelation process.
Abstract
We used a thermally reversible hybrid gel made of billions of physically jam-packed swollen thermally sensitivepoly(N-isopropyl-acrylamide) chemical microgels. Laser light scattering study on a series of such hybrid gels formed atdifferent gelling rates and temperatures revealed that the position-dependence of the scattering speckle pattern(staticnonergodicity) came from large voids formed during the sol-gel transition. With a proper preparation
such a nonergodicity could be completely removed indicating that the static nonergodicity generally observed in a gel is not intrinsic
but comes from the clustering"island" structure formed during the gelation process.
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