公开(公告)号：JP2001089129A

公开(公告)日：2001-04-03

申请号：JP26477899

申请日：1999-09-20

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YODA SATOSHI ,  OTAKE KATSUTO ,  TAKEBAYASHI YOSHIHIRO ,  SUGATA TAKESHI ,  SAKO TAKESHI

IPC: B01J3/00 ,  C01B33/16

Abstract: PROBLEM TO BE SOLVED: To solve the problems of conventional process for the impregnation of a metal compound in a wet silica gel in liquid phase comprising the long time necessary for the impregnation into the gel depending on the kind and concentration of the compound and the formation of an insufficiently impregnated product to cause frequent failure in getting a monolithic composite material of metal compound and silica aerogel. SOLUTION: A dry medium mixed with a metal compound is impregnated in a wet silica gel and dried to obtain a silica aerogel composed of the metal compound and silica particles forming a composite material. In the above process, both of the impregnation process and the drying process are carried out under supercritical condition of the dry medium to obtain the objective monolithic composite material of metal compound and silica aerogel.

公开(公告)号：JPH09188600A

公开(公告)日：1997-07-22

申请号：JP99496

申请日：1996-01-08

Applicant: AGENCY IND SCIENCE TECHN

Inventor： TASAKA TEIJI ,  YODA SATOSHI ,  OSHIMA SATORU ,  YUMURA MORIO ,  UCHIDA KUNIO ,  KURIKI YASUNORI ,  IGASAKI FUMIKAZU

IPC: C30B29/62 ,  B82B1/00 ,  C01B31/02

Abstract: PROBLEM TO BE SOLVED: To provide a carbon whisker having a diameter of μm order and easily handleable as an industrial product and provide its production process. SOLUTION: The carbon whisker has a diameter of 0.1-10μm. The whisker can be produced by generating arc discharge in an inert gas between an anode composed of graphite and a hydrogen-occluding metal and an arbitrary heat- resistant cathode to form a carbon deposit containing carbon whiskers on the cathode.

公开(公告)号：JPH10130003A

公开(公告)日：1998-05-19

申请号：JP3375897

申请日：1997-02-18

Applicant: AGENCY IND SCIENCE TECHN

Inventor： YODA SATOSHI ,  IGASAKI FUMIKAZU ,  OSHIMA SATORU ,  KAWAI AKIKO ,  KAMIYA KUNIO ,  UCHIDA KUNIO ,  GOTO AKIHIRO

IPC: C01B13/14 ,  B01J13/00 ,  C01B33/158 ,  C01G23/053

Abstract: PROBLEM TO BE SOLVED: To obtain an aerogel of an excellent bulk body free from the generation of shrinkage and crack by holding a wet gel body of a metal oxide, a solvent and a specific material under a prescribed condition and removing the solvent to dry the wet gel body. SOLUTION: The wet gel body of the metal oxide (e.g. a silica wet gel body obtained by impregnating the gel body, which is obtained by mixing tetramethoxysilane with a methanol/ammonia water, pouring to a prescribed shaped vessel and allowing to stand, with methanol to remove an unreacted component), the solvent (e.g. methanol) and a granular zeolite having preferably 2-3mm average particle diameter are held under the critical condition or super critical condition (e.g. 280 deg.C 140atm) of the solvent preferably for 1-3hr and after that, the solvent is gradually released and removed to dry the wet gel body.