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Carbon cryogel microspheres (CC microspheres) are synthesized through the inverse emulsion polymerization of a resorcinol-formaldehyde (RF) aqueous solution in cyclohexane using SPAN80 as an emulsifier. The conditions of the inverse emulsion polymerization, specifically the volume ratio of SPAN80 to cyclohexane, the temperature of the emulsification, T gel , and the holding time after the...
Carbon gel microspheres were synthesized by the inverse emulsion polymerization of resorcinol with formaldehyde, followed by drying and pyrolysis in an inert atmosphere. By using freeze-drying and hot air drying for the preparation of the precursors, carbon cryogel microspheres (CCM) and carbon xerogel microspheres (CXM) were respectively synthesized to study the influence of the drying method on...
The role of surfactants on carbon cryogels is investigated by using three different surfactants, nonionic (SPAN80), cationic (trimethylstearylammonium chloride; C18) and nonionic polymeric fluorinated (FC4430) surfactants. By using different SPAN80 concentrations (10.0, 5.0, 2.5, 1.0 and 0.5 vol.%), double-structure carbon microspheres with S BET (630-700 m 2 /g) and V ...
Effects of iodine or bromine treatments on the stabilization and carbonization of pitches were investigated by using five kinds of pitch-model compounds with different molecular structures. Iodine treatment significantly modified the thermal properties of compounds with condensed aromatic-rings, which resulted in a high carbon yield. In iodine treatment remarkable reaction was more easily achieved...
Carbon cryogel microspheres (CC microspheres) were successfully synthesized by an inverse emulsion polymerization of resorcinol with formaldehyde, followed by freeze drying and pyrolysis in an inert atmosphere. CC microspheres were characterized by scanning electron microscopy, elemental analysis and various gas adsorption measurements. By changing both the temperature for preparing the emulsion and...
Resorcinol-formaldehyde (RF) gels were synthesized by sol-gel polycondensation of resorcinol with formaldehyde to prepare mesoporous carbon precursors. RF cryogels were prepared by freeze drying of RF gels, where t-butanol and water were used as solvents. The freezing temperature, the number of repetitive rinse times with t-butanol, and the sample size were changed in the preparation of RF cryogels...
Resorcinol–formaldehyde (RF) cryogels were synthesized by sol-gel polycondensation of resorcinol with formaldehyde and freeze drying with t-butanol. The cryogels were characterized by nitrogen adsorption and density measurements. Their porous properties were compared with those of RF aerogels prepared by supercritical drying with carbon dioxide. RF cryogels were mesoporous materials with large mesopore...
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