Internal surface polarity of regenerated cellulose gel depends on the species used as coagulant

► Regenerated cellulose gels can be prepared from aqueous solution by using various coagulants. ► Gels show different adsorptivity comparing an aromatic dye and iodine. ► X-ray diffraction and SEM images show corresponding structural differences. ► Internal gel surface is hydrophobic when coagulated by alcohols; but hydrophilic if water is used.