Korea Advanced Institute of Science and Technology

Seung-Man Yang

Seung-Jin Lee

Dae-Geun Choi

Seung-Bin Park

Sarah Kim

Ki-Ra Yi

Yong- Hak Park

Se Gyu Jang

Sang-Yon Lee

A method of fabricating a patterned polymer film with nanometer scale includes filling particles each having a predetermined size in a pattern provided to a soft polymer mold to prepare an embossed stamp; placing the embossed stamp on a desired polymer film; allowing the embossed stamp placed on the polymer film to stand at temperatures higher than a glass transfer temperature of the polymer film for a predetermined time; and releasing the embossed stamp from the polymer film. Alternatively, the patterned polymer film is obtained by filling particles each having a predetermined size in a pattern provided to a soft polymer mold to prepare an embossed stamp; placing the embossed stamp on a coating layer of a polymer precursor formed on a substrate; curing the coating layer; and releasing the embossed stamp from the cured coating layer.

Method of fabricating patterned polymer film with nanometer scale

A method of preparing patterned colloidal crystals includes filling a monomer solution in the interstices between particles of planar colloidal crystals for photopolymerization inside them, and performing a selective photopolymerization process between the colloidal crystals using a mask. In one exemplary method, a first monomer solution for photopolymerization is filled inside planar colloidal crystals. A first selective photopolymerization process is performed inside the colloidal crystals using a mask. A second monomer solution for photopolymerization is filled into the firstly patterned colloidal crystals. At least one additional photopolymerization process is performed inside the firstly patterned colloidal crystals using an additional mask. Through this method, colloidal crystalline regions oriented in the same direction with different refractive indexes can be controlled in a level of &#x3bc;m. Further, repeated patterns can be inexpensively and easily prepared.

Method of preparing patterned colloidal crystals

The present invention relates to a process for preparing a composite inorganic membrane for hydrogen separation, more specifically, to a process for preparing a composite inorganic membrane for hydrogen separation which comprises formation of intermediate layer in an asymmetric porous alumina support by sol-gel method, and modification of pores of the alumina membrane by soaking palladium acetate solution into the pores and vapor-deposition to enhance the permeability and selectivity for hydrogen. A process for preparing an inorganic membrane for hydrogen separation comprises the steps of: (i) dip-coating an alumina support in alumina sol containing a palladium precursor which is uniformly dispersed while vacuumizing the inside of the support, to form an intermediate layer of thin palladium impregnated alumina membrane; (ii) soaking the membrane obtained in step(i) in the palladium precursor solution, drying it under vacuum for 2 to 4 hours, and vaporizing the soaked materials with the gradual increase of temperature up to 170.degree. to 190.degree. C. for the vaporized palladium precursor to be deposited onto the pores; and, (iii) heating the alumina membrane whose pores are deposited with palladium at 290.degree. to 310.degree. C. while vacuumizing the inside of the support.

Process for preparing a composite inorganic membrane for hydrogen

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Daejeon, South Korea

Seung-Man Yang