公开(公告)号：DE69801082T2

公开(公告)日：2002-03-21

申请号：DE69801082

申请日：1998-09-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN YOU-LUNG ,  VALDES JORGE LUIS ,  PATEL SANJAY

IPC: C03B8/02 ,  C03B20/00 ,  C03B37/012 ,  C03C1/00 ,  C01B33/148

Abstract: The invention provides an alternative to conventional sol-gel methods that utilize undesirably high amounts of a stabilizing agent such as TMAH and a gelling agent such as methyl formate. The method involves the steps of (a) providing a colloidal silica dispersion containing a stabilizing/gelling agent, where only a portion of the molecules of the agent ionize, and (b) subsequently adding to the silica dispersion a pH-reducing additive. The stabilizing/gelling agent has a dual function. The agent, e.g., an amine, initially acts as a stabilizer in the silica dispersion in that a portion of its molecules ionize, while an appreciable amount of the agent remains nonionized. The agent later transforms in situ to a gelling agent upon addition of a pH-reducing additive. Specifically, as the pH-reducing additive lowers the pH to values at or around the pKa of the stabilizing/gelling agent, more of the agent's molecules are ionized, these cations contributing to charge neutralization, and thus gellation, of the colloidal silica particles.

公开(公告)号：DE69904680T2

公开(公告)日：2003-11-13

申请号：DE69904680

申请日：1999-08-23

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CARASSO MELANIE ,  PATEL SANJAY ,  VALDES JORGE LUIS ,  WHITE CHRISTOPHER ALAN

IPC: B01J8/00 ,  G01N15/02 ,  G01N15/06 ,  G01N29/11 ,  G01N29/42 ,  G01N29/46 ,  G01N29/02 ,  G01N21/47

Abstract: The invention provides an improved process for determining the characteristics of dispersed particles. The process involves directing waves (acoustic or light) into a dispersion, and measuring the attenuation of the waves for particular frequencies to provide an attenuation spectrum. The measured attenuation spectrum is then compared to a set of theory-based calculated attenuation spectra to determine the particle size distribution corresponding to the measured attenuation spectrum. Unlike previous processes, the particle size distribution is capable of being accurately determined by a single inversion algorithm, thus eliminating burdensome steps of previous methods.

公开(公告)号：DE69904680D1

公开(公告)日：2003-02-06

申请号：DE69904680

申请日：1999-08-23

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CARASSO MELANIE ,  PATEL SANJAY ,  VALDES JORGE LUIS ,  WHITE CHRISTOPHER ALAN

IPC: B01J8/00 ,  G01N15/02 ,  G01N15/06 ,  G01N29/11 ,  G01N29/42 ,  G01N29/46 ,  G01N29/02 ,  G01N21/47

Abstract: The invention provides an improved process for determining the characteristics of dispersed particles. The process involves directing waves (acoustic or light) into a dispersion, and measuring the attenuation of the waves for particular frequencies to provide an attenuation spectrum. The measured attenuation spectrum is then compared to a set of theory-based calculated attenuation spectra to determine the particle size distribution corresponding to the measured attenuation spectrum. Unlike previous processes, the particle size distribution is capable of being accurately determined by a single inversion algorithm, thus eliminating burdensome steps of previous methods.

公开(公告)号：CA2296819A1

公开(公告)日：2000-08-11

申请号：CA2296819

申请日：2000-01-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BRAUN PAUL VANNEST ,  PATEL SANJAY ,  WILTZIUS PIERRE

IPC: C30B29/62 ,  G02B5/20 ,  G02B6/12 ,  H01L21/02

Abstract: A structure exhibiting substantial periodicity on a micron scale, e.g., a photonic band gap material, is provided. The structure is fabricated by a process involving the steps of providing a template comprising a colloidal crystal, and introducing into the colloidal crystal a liquid dispersion of nanoparticles. The resulting composite is treated, e.g., dried, to form a cohesive structure from the nanoparticles, and the colloidal crystal particles are removed to form the ordered structure.

公开(公告)号：DE69721204T2

公开(公告)日：2004-02-05

申请号：DE69721204

申请日：1997-12-16

Applicant: LUCENT TECHNOLOGIES INC

Inventor： HALE ARTURO ,  PATEL SANJAY ,  BLYLER JR

IPC: G02B6/44 ,  C03C25/10 ,  C03C25/24 ,  C08F2/48 ,  C08F8/42 ,  C08F290/06 ,  C08L55/00 ,  C09D4/00 ,  G02B6/02 ,  G02B1/00

Abstract: A composition useful for making a coated optical fiber wherein the composition comprises a photocurable or E-beam curable composition having an alkoxysilane functionality attached through a long backbone.

公开(公告)号：DE69801082D1

公开(公告)日：2001-08-16

申请号：DE69801082

申请日：1998-09-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： CHEN YOU-LUNG ,  VALDES JORGE LUIS ,  PATEL SANJAY

IPC: C03B8/02 ,  C03B20/00 ,  C03B37/012 ,  C03C1/00 ,  C01B33/148

Abstract: The invention provides an alternative to conventional sol-gel methods that utilize undesirably high amounts of a stabilizing agent such as TMAH and a gelling agent such as methyl formate. The method involves the steps of (a) providing a colloidal silica dispersion containing a stabilizing/gelling agent, where only a portion of the molecules of the agent ionize, and (b) subsequently adding to the silica dispersion a pH-reducing additive. The stabilizing/gelling agent has a dual function. The agent, e.g., an amine, initially acts as a stabilizer in the silica dispersion in that a portion of its molecules ionize, while an appreciable amount of the agent remains nonionized. The agent later transforms in situ to a gelling agent upon addition of a pH-reducing additive. Specifically, as the pH-reducing additive lowers the pH to values at or around the pKa of the stabilizing/gelling agent, more of the agent's molecules are ionized, these cations contributing to charge neutralization, and thus gellation, of the colloidal silica particles.