Chevron U.s.a. Inc.

Los Alamos National Security, LLC

Triad National Security, LLC

Robert David Gilbertson

Hakim Boukhalfa

Harvey Edwin Goodman

Ross Edward Muenchausen

Robert Clifford Roback

Anthony Keiran Burrell

Jurgen G Schmidt

Kevin Curtis Ott

Thomas Mark McCleskey

Robert F Williams

Bryan L Bennett

Edward McKigney

Charlie E Strauss

Rico Emilio Del Sesto

Deryck Edward Matthew Williams

Rajesh S Nair

Scott W Imbus

Nathan James Welch

Timothy Leo Quirk

David Wayne Cooke

Edward Allen Mckigney

Paul William Peterson

Minesh Kantilal Bacrania

Embodiments of the disclosure include swellable smart gel sealants and methods of using smart gel sealants. In certain embodiments, the smart gel sealants reversibly swell when exposed to a certain trigger, such as carbonic acid and/or sulfuric acid. In specific embodiments, the smart gel is comprised within a cement composition.

Method to enhance the self-sealing of well cement leakage pathways using a smart gel cement additive

Embodiments of the disclosure include swellable smart gel sealants and methods of using smart gel sealants. In certain embodiments, the smart gel sealants reversibly swell when exposed to a certain trigger, such as temperature or pH. In specific embodiments, the smart gel is disposed within voids in a well and triggered to swell in order to seal the voids. One application of the smart gel sealant is to seal the casing of a well against the leakage of gas, such as HS.

Method for sealing a void in a well using smart gels

The present disclosure provides improved methods for controlled cyclization of peptoid dimers to form N,N'-2,5-diketopiperazines (N,N&#x2032;-2,5-DKPs) with significant selectivity. In at least some examples, selectivity is based on a serendipitous conglomeration of slow exchange of amide rotamers, steric repulsion from the degree of &#x3b1;-substitution, and the geometric bulk of an amine nucleophile. By varying reaction conditions, the selectivity of the reaction and formation of a particular N,N&#x2032;-2,5-DKP can be switched. The cyclization works in the presence of a variety of protection groups and diverse functionalities. The teachings herein provide techniques for synthesizing N,N&#x2032;-2,5-DKPs that can be readily docked with drug candidates for shuttling across the blood brain barrier. This method provides a facile way to produce substituted DKPs containing groups ready for post-modification to include docking drug candidates.

Controlled cyclization of peptoids to form chiral diketopiperazines

Embodiments of the disclosure include swellable smart gel sealants. In certain embodiments, the smart gel sealants reversibly swell when exposed to a certain trigger, such as temperature or pH. In specific embodiments, the smart gel is disposed within voids in a well and triggered to swell in order to seal the voids. One application of the smart gel sealant is to seal the casing of a well against the leakage of gas, such as CO.

Method for sealing a void in a well using a smart gel sealant

An improved nanophosphor composite comprises surface modified nanophosphor particles in a solid matrix. The nanophosphor particle surface is modified with an organic ligand, or by covalently bonding a polymeric or polymeric precursor material. The surface modified nanophosphor particle is essentially charge neutral, thereby preventing agglomeration of the nanophosphor particles during formation of the composite material. The improved nanophosphor composite may be used in any conventional scintillator application, including in a radiation detector.

Nanophosphor composite scintillators comprising a polymer matrix

An improved nanophosphor scintillator liquid comprises nanophosphor particles in a liquid matrix. The nanophosphor particles are optionally surface modified with an organic ligand. The surface modified nanophosphor particle is essentially surface charge neutral, thereby preventing agglomeration of the nanophosphor particles during dispersion in a liquid scintillator matrix. The improved nanophosphor scintillator liquid may be used in any conventional liquid scintillator application, including in a radiation detector.

Nanophosphor composite scintillator with a liquid matrix

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Los Alamos, NM, United States of America

Robert David Gilbertson