skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Sol-gel process for the manufacture of high power switches

Abstract

According to one embodiment, a photoconductive semiconductor switch includes a structure of nanopowder of a high band gap material, where the nanopowder is optically transparent, and where the nanopowder has a physical characteristic of formation from a sol-gel process. According to another embodiment, a method includes mixing a sol-gel precursor compound, a hydroxy benzene and an aldehyde in a solvent thereby creating a mixture, causing the mixture to gel thereby forming a wet gel, drying the wet gel to form a nanopowder, and applying a thermal treatment to form a SiC nanopowder.

Inventors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1326800
Patent Number(s):
9,455,366
Application Number:
13/843,863
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA) LLNL
DOE Contract Number:
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Mar 15
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Landingham, Richard L., Satcher, Jr, Joe, and Reibold, Robert. Sol-gel process for the manufacture of high power switches. United States: N. p., 2016. Web.
Landingham, Richard L., Satcher, Jr, Joe, & Reibold, Robert. Sol-gel process for the manufacture of high power switches. United States.
Landingham, Richard L., Satcher, Jr, Joe, and Reibold, Robert. Tue . "Sol-gel process for the manufacture of high power switches". United States. doi:. https://www.osti.gov/servlets/purl/1326800.
@article{osti_1326800,
title = {Sol-gel process for the manufacture of high power switches},
author = {Landingham, Richard L. and Satcher, Jr, Joe and Reibold, Robert},
abstractNote = {According to one embodiment, a photoconductive semiconductor switch includes a structure of nanopowder of a high band gap material, where the nanopowder is optically transparent, and where the nanopowder has a physical characteristic of formation from a sol-gel process. According to another embodiment, a method includes mixing a sol-gel precursor compound, a hydroxy benzene and an aldehyde in a solvent thereby creating a mixture, causing the mixture to gel thereby forming a wet gel, drying the wet gel to form a nanopowder, and applying a thermal treatment to form a SiC nanopowder.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 27 00:00:00 EDT 2016},
month = {Tue Sep 27 00:00:00 EDT 2016}
}

Patent:

Save / Share:
  • Method is described for fabricating an article at least in part composed of high silica glass including fabricating a high-silica glass body by a method comprising gelling a sol, the sol comprising a suspension of colloidal silica particles in a suspension medium, so resulting in a gel, drying the gel so as to substantially remove the suspension medium, and firing such gel to produce a high-silica glass body, and carrying out any further processing necessary to yield the article characterized in that the said sol, during a substantial part of the gelling, contains additive including a first additive consisting essentiallymore » of at least one organic polymer, the polymer being characterized as: (1) of amount sufficient to monomolecularly coat from 5% to 50% of the total free surface of the colloidal silica particles, (2) of solubility as to result in substantially complete solution in the said sol prior to gelation, (3) of such nature as to wet the said silica particles, (4) of such composition as to thermally decompose primarily to gaseous decomposition product so that the high silica glass body is substantially free of the polymer as well as of decomposition product constituting a meaningful contaminant deleteriously affecting performance of the article.« less
  • Gradient-index alkali borosilicate antireflection films for use in laser systems were deposited by the sol-gel process. Laser damage thresholds of these films, measured with 1.07 ..mu..m, 1-ns pulses, were four times greater than thresholds of widely-used, multilayer, antireflection coatings.
  • The present invention provides a process for the encapsulation of biologically important proteins into transparent, porous silica matrices by an alcohol-free, aqueous, colloidal sol-gel process, and to the biological materials encapsulated thereby. The process is exemplified by studies involving encapsulated cytochrome c, catalase, myoglobin, and hemoglobin, although non-proteinaceous biomaterials, such as active DNA or RNA fragments, cells or even tissues, may also be encapsulated in accordance with the present methods. Conformation, and hence activity of the biomaterial, is successfully retained after encapsulation as demonstrated by optical characterization of the molecules, even after long-term storage. The retained conformation of the biomaterialmore » is strongly correlated to both the rate of gelation and the subsequent drying speed of the encapsulatng matrix. Moreover, in accordance with this process, gelation is accelerated by the use of a higher colloidal solid concentration and a lower synthesis pH than conventional methods, thereby enhancing structural stability and retained conformation of the biomaterials. Thus, the invention also provides a remarkable improvement in retaining the biological activity of the encapsulated biomaterial, as compared with those involved in conventional alkoxide-based processes. It further provides new methods for the quantitative and qualitative detection of test substances that are reactive to, or catalyzed by, the active, encapsulated biological materials.« less
  • An external gelation process is described which produces granules of metal hydride particles contained within a sol-gel matrix. The resulting granules are dimensionally stable and are useful for applications such as hydrogen separation and hydrogen purification. An additional coating technique for strengthening the granules is also provided.