Abstract: The present invention is to provide a skin external preparation with good moisture retention, a rough skin improving effect, and an improved feeling in use. A skin external preparation comprising a polyoxyalkylene glycol/polyethylene glycol copolymer alkyl ether derivative represented by the below-described general formula (I): (formula I) Y—{O(EO)a/(AO)b—R}k??(I) (In the formula, Y is the residue given by removing hydroxyl groups from a polyhydric alcohol having 3 to 6 hydroxyl groups, and k is the number of hydroxyl groups of the polyhydric alcohol. EO is an oxyethylene group; AO is an oxyalkylene group having 3 to 4 carbon atoms, and 1?a?70, 1?b?70. The percentage of the oxyethylene groups with respect to the sum of the oxyalkylene groups having 3 to 4 carbon atoms and the oxyethylene groups is 20 to 100 mass %. The oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group are added randomly.

Abstract: The object of the present invention is to provide a production method of mesoporous silica under electrolyte-free conditions by using a surfactant aggregate structure as a template and to provide mesoporous silica with a new shape, which could not be obtained in the past. It is possible to prepare mesoporous silica under electrolyte-free conditions by reacting a nonionic surfactant and a water-soluble silicate monomer with a specific structure under neutral conditions. In addition, a sheet-like mesoporous silica can be prepared in the use of a nonionic surfactant that can form a ribbon phase or a nematic phase in suitable temperature and concentration ranges in a water solution.