Abstract
During hypercritical drying (HD), physicochemical transformations are induced which can be associated with an acceleration of the aging effect. The macroscopic signature of this evolution is an isotropic shrinkage characteristic of syneresis. During hypercritical drying, dangling bonds in the network can condense and form new links. The structural transformation of the silica gel is followed by small angle neutron scattering. The pore size evolution is deduced from thermoporometry. The increase of the connectivity in the solid network during HD is shown in the enhancement of the elastic and mechanical features of the materials
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