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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 nonergodicitycould be completely removed, indicating that the static nonergodicity generally observed in a gel is not indinsic, but comesfrom the clustering “island” structure formed during the gelation process.
We used a thermally reversible hybrid gel made of billions of physically jam-packed swollen thermally sensitive poly (N-isopropyl-acrylamide) chemical microgels. Laser light scattering study on a series of such hybrid gels formed at different tender rates and temperatures revealed that the position- dependence of the scattering speckle pattern (static nonergodicity) came from large voids formed during the sol-gel transition. With a proper preparation, such a nonergodicity can be completely removed, the indicating that the static nonergodicity generally in a gel is not indinsic, but comes from the clustering “island ” structure formed during the gelation process.