Texture control of freeze-dried resorcinol–formaldehyde gels
1998; Elsevier BV; Volume: 225; Linguagem: Inglês
10.1016/s0022-3093(98)00101-x
ISSN1873-4812
AutoresRégine Kocklenberg, B. Mathieu, Silvia Blacher, R. Pirard, Jean‐Paul Pirard, R. Sobry, G. Van den Bossche,
Tópico(s)Photonic Crystals and Applications
ResumoResorcinol–formaldehyde gels synthesized in water were freeze-dried to a monolithic and highly porous material. The influence of dilution and aging time on the porous texture after drying were studied using nitrogen adsorption–desorption, mercury porosimetry and small angle X-ray scattering. The drying method produces very large pores by ice crystal growth, and changes the porous texture of the original wet gel. Freeze-drying does not substantially modify microporosity and mesoporosity, which are mainly fixed by reactant concentration and aging time.
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