公开(公告)号：JP2001048549A

公开(公告)日：2001-02-20

申请号：JP2000179741

申请日：2000-06-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CAUDA MICHAEL J ,  TAYLOR-SMITH RALPH E ,  VALDES JORGE L

IPC: G02B6/00 ,  B01J13/00 ,  C01B33/14 ,  C03B8/02 ,  C03B37/016 ,  C03C1/00

Abstract: PROBLEM TO BE SOLVED: To produce a large-sized silica body free of crack by subjecting silica sol containing an organic surfactant whose molecular weight is specified to gelling and heat-treating the formed gel body. SOLUTION: Silica sol containing an organic surfactant having 10,000 molecular weight, containing 50% relative humidity). Further, heat treatment is carried out in order to carry out burning out of existing organic substance, dehydroxylation, removal of residual water content and sintering to provide sintered gel body suitable for overcladding tube.

公开(公告)号：JPH09184825A

公开(公告)日：1997-07-15

申请号：JP32969196

申请日：1996-12-10

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CADET GARDY ,  VALDES JORGE L

IPC: G01N29/02 ,  G01N29/00 ,  G01N29/024 ,  G01N29/22 ,  G01N29/18

Abstract: PROBLEM TO BE SOLVED: To provide a gas composition-analyzing acoustic cell which fits a vacuum system and a corrosive gas environment without acoustic coupling of a converter to a cell main body and operates in a frequency range enabling measurements of various gas mixtures. SOLUTION: A gas composition-analyzing acoustic cell 10 has a converter 80 insulated from a cell main body by a metallic housing 40. A sound-absorbing sleeve 100 surrounding a main body of the converter increases a signal-noise ratio to at least 4:1. The converter used in the acoustic cell operates in a range of kiloheltz and decreases attenuations in a gas mixture to be analyzed. The cell main body uses a vacuum seal permitting the in-line use with a vacuum device.

公开(公告)号：JP2000219517A

公开(公告)日：2000-08-08

申请号：JP2000015647

申请日：2000-01-25

Applicant: LUCENT TECHNOLOGIES INC

Inventor： MICHAEL J CODA ,  GEORGE SANCHEZ ,  VALDES JORGE L

IPC: C03B8/02 ,  C03B20/00 ,  C03B37/016 ,  C03C1/00

Abstract: PROBLEM TO BE SOLVED: To provide a method to improve a sol-gel processing method or its alternate method. SOLUTION: An aq. dispersion liquid of silica particles is mixed with a dialkyldialkoxy silane monomer such as dimethyl diethoxy silane under basic condition. Or, the monomer or a part of the monomer may be reacted so that a low mol.wt. polydialkyl siloxane such as polydimethyl siloxane can be added with the monomer or added as a substitute for the monomer. The addition of the monomer or low mol.wt. compd. induces gelation of silica. Silanol groups on the polydialkylsiloxane chain during growing aggregates with the silanol groups on the silica particle surface, and thereby, the particles can be fixed to the chains. The chains can form bridges between particles and/or loops on individual particles. The bridge initiates the formation of a silica particle net, and both of the bridges and loops increase hydrophobicity of the silica particles. These characteristics contribute to the gelation of silica particles independently from the surface energy of particles.