Julia G Greer

US Patent:

8299341, Oct 30, 2012

Filed:

May 13, 2010

Appl. No.:

12/779780

Inventors:

Julia R. Greer - Pasadena CA, US
Michael Burek - Waterloo, CA

Assignee:

The California Institute of Technology - Pasadena CA

International Classification:

H01L 21/44

US Classification:

977712, 977721, 977722, 977816, 438479, 438679, 438681, 438678, 257E51043

Abstract:

Solid and hollow cylindrical nanopillars with nanoscale diameters are provided. Also provides is a method of making such nanopillars using electron beam lithography followed by the electroplating.

US Patent:

8557507, Oct 15, 2013

Filed:

Nov 7, 2011

Appl. No.:

13/291002

Inventors:

Dongchan Jang - Pasadena CA, US
Julia R. Greer - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

G03F 7/26

US Classification:

430315, 430320

Abstract:

Nanopillars with nanoscale diameters are provided where the nanopillar has uniformly aligned nano-twins either perpendicular or inclined by 1-90 to the pillar-axis with no grain-boundaries or any other features.

US Patent:

20100281963, Nov 11, 2010

Filed:

Dec 26, 2007

Appl. No.:

11/964450

Inventors:

Julia R. Greer - Pasadena CA, US

Assignee:

California Institute of Technology. - Pasadena CA

International Classification:

G01N 3/42

US Classification:

73 82

Abstract:

The invention is an indenter tip that is modified to permit both compression testing and tensile testing on samples having dimensions smaller than approximately 1 μm. The modified indenter tip has both a surface that can be used to apply compressive forces, and tines that can be used to engage a free end of a specimen to be tested in tension. The apparatus used to perform the tests includes elements of a scanning electron microscope that permit visualization of the specimen to be tested and the modified indenter tip, so as to permit appropriate alignment and engagement of the same. The apparatus also includes elements of a microindenter that provide mechanical manipulation of the relative position and orientation of the modified indenter tip and of the specimen to be tested, as well as the necessary controls and instrumentation to perform the test and to collect, record and manipulate data.

US Patent:

20120181346, Jul 19, 2012

Filed:

Jan 13, 2012

Appl. No.:

13/350734

Inventors:

Harold F. GREER - Pasadena CA, US
Julia R. GREER - Pasadena CA, US

International Classification:

A61L 9/04
B29C 59/02
C23F 1/00
C03C 15/00
B82Y 40/00

US Classification:

239 1, 216 67, 216 24, 216 41, 264293, 239 34, 977887, 977888

Abstract:

A method of controlling wetting characteristics is described. Such method includes forming and configuring nanostructures on a surface where controlling of the wetting characteristics is desired. Surfaces and methods of fabricating such surfaces are also described.

US Patent:

20220336933, Oct 20, 2022

Filed:

Apr 12, 2022

Appl. No.:

17/718705

Inventors:

- Pasedena CA, US
Julia R. GREER - Pasadena CA, US

International Classification:

H01M 50/569

Abstract:

A method of interrogating an electrochemical cell includes: applying a positive direct current to the electrochemical cell for a first time period, wherein the positive direct current is characterized by a first magnitude; applying a negative direct current to the electrochemical cell for a second time period, wherein the negative direct current is characterized by a second magnitude; wherein the first and second time periods have a combined duration of less than 2 seconds; wherein the second magnitude is equal to or within 50% of the first magnitude; recording cell resistance data of the electrochemical cell during each time period; and analyzing the cell resistance data to determine at least one of: (i) state of charge of the electrochemical cell; (ii) state of health of the electrochemical cell; and (iii) the resistance anisotropy of the cell.

US Patent:

20220314183, Oct 6, 2022

Filed:

Mar 31, 2022

Appl. No.:

17/710456

Inventors:

- Pasadena CA, US
Julia R. GREER - Pasadena CA, US
Max L. LIFSON - Pasadena CA, US
Michael A. CITRIN - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

B01J 13/00
H01M 4/48
G03F 7/004
G03F 7/00
B01J 6/00
G03F 7/032
C08G 65/00
C08K 3/28
G03F 7/20
H01M 4/133

Abstract:

In an aspect, a method for making a metal-containing material comprises steps of: forming a metal-containing hydrogel from an aqueous precursor mixture using a photopolymerization; wherein the aqueous precursor mixture comprises water, one or more aqueous photosensitive binders, and one or more aqueous metal salts; and thermally treating the metal-containing hydrogel to form the metal-containing material; wherein the metal-containing hydrogel is exposed to a thermal-treatment atmosphere during the step of thermally treating; wherein a composition of the metal-containing material is at least partially determined by a composition of the thermal-treatment atmosphere during the thermally treating step.

US Patent:

20230024854, Jan 26, 2023

Filed:

Jul 12, 2022

Appl. No.:

17/862916

Inventors:

- Pasadena CA, US
Julia R. GREER - Pasadena CA, US
Harry A. ATWATER - Pasadena CA, US
Ognjen ILIC - Pasadena CA, US

International Classification:

B01D 69/14
B01D 53/26
B01D 61/36
B01D 71/38
B01D 69/02
C02F 1/44

Abstract:

A membrane for water collection may include a sheet having a top surface and a bottom surface, and a plurality of conical structures disposed on the top surface of the sheet, the conical structures comprising a hydrogel material. Each conical structure of the plurality of conical structures may have a height of 1 mm to 50 mm, wherein height is measured from the top surface of the sheet to an apex of a conical structure. Each conical structure of the plurality of conical structures may have an apex angle of 10 to 60 degrees.

US Patent:

20210340334, Nov 4, 2021

Filed:

Sep 25, 2020

Appl. No.:

17/032539

Inventors:

- Pasadena CA, US
Daryl Wei Liang YEE - Pasadena CA, US
Dennis M. KOCHMANN - Pasadena CA, US
Julia R. GREER - Pasadena CA, US

International Classification:

C08J 3/02
C08J 9/26
C23C 16/455
C23C 16/40

Abstract:

In an aspect, provided herein are low density materials, including shell-based materials, with three-dimensional architectures formed, in part, via self-assembly processes. Shell-based materials of some embodiments exhibit a combination of ultralow density (e.g., ≤100 mg cmand optionally ≤10 100 mg cm) and non-periodic architectures characterized by low defect densities and geometries avoiding stress concentrations. Low density shell based materials of some embodiments have architectures characterized by small curvatures and lack of straight edges providing enhance mechanical response. In some embodiments, for example, the present low density materials, including shell-based materials, providing a combination target mechanical properties including high stiffness-to-density ratios, mechanical resilience and tolerance for deformation.