Characterization of Coating Films of Thixotropic Solvent Gel Containing Organo‐modified Nanodiamonds

Abstract

A gelation solvent containing a diamide-based thixotropic additive with two hydrocarbons and organo-modified nanodiamonds was prepared and evaluated herein as a coating film. Nanodiamonds were introduced into a solvent containing diamide-based thixotropic additive molecules with 12-hydroxystearyl chains which were uniformly dispersed due to organic chain modification on the outermost layer surface. In addition to common solvents including toluene, ethyl cetyl hexanoate, a cosmetic emollient, forms nanodiamond-containing gels. The helical nanofibers formed by the diamide-based thixotropic additive molecule with two hydrocarbons in the gel showed affinity for the organo-modified nanodiamonds, and the contact morphology between the nanofibers and nanodiamond particles was confirmed. Nanodiamonds exhibited a denaturation effect on biomolecules adsorbed on their surfaces. Overall, nanodiamond-containing emollient gels are expected to exhibit antibacterial properties against viruses and malodorous bacteria on skin as part of thixotropic immobilization films for cosmetic powders.