Preparation of asymmetric porous materials

a porous material and asymmetric technology, applied in the direction of catalyst carriers, membranes, separation processes, etc., can solve the problems of limited direct synthesis of such materials, limited operation, and limited temperature range of chiral molecules

Inactive Publication Date: 2012-11-29
SANDIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables the fabrication of novel chiral and asymmetric porous materials with tailored properties, enhancing molecular recognition, separation, and catalysis capabilities, and enabling the detection and processing of chiral molecules with improved efficiency and temperature operability.

Problems solved by technology

Unfortunately, direct synthesis of such materials has been limited to a few chemical compositions, most commonly silicas, aluminosilicates and aluminophosphates.
However, the reliable detection and processing of specific chiral molecules remains a challenge.
Chiral membranes are based on organic polymers, thus operation is limited to relatively low temperatures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017]Growth of a zeolite layer onto a glass slide substrate, and subsequent deformation of substrate and zeolite layer.

[0018]A precursor solution was prepared, containing silica (SiO2), tetrapropyl ammonium hydroxide (TPAOH), ethanol (C2H5OH), and deionzed water (H2O) in the following molar ratios:

10 SiO2:3 TPAOH:40 C2H5OH:1050 H2O

[0019]The SiO2 and ethanol were formed from the hydrolysis of tetraethyl orthosilicate (TEOS, Si(OC2H5)4). When heated in a sealed vessel at approximately 165° C. under autogeneous pressure, this solution is known to yield coatings of zeolite type silicalite-l on many different types of surface.

[0020]Approximately 3.1 g TEOS was mixed with 2.25 g of a 40 wt.-% solution of TPAOH in water and 27.9 g deionized water. The mixture was sealed in a plastic bottle and shaken at room temperature using a wrist-action shaker for 2 hours. The solution was then decanted into a Teflon-lined stainless-steel high-pressure reaction vessel. The Teflon liner had internal di...

example 2

[0023]Growth of a zeolite layer onto a pre-deformed glass slide substrate, and subsequent removal of deformation from substrate.

[0024]A precursor solution was prepared as described in Example 1. The precursor solution was sealed in a plastic bottle and shaken at room temperature using a wrist-action shaker for 2 hours. The solution was then decanted into a Teflon-lined stainless-steel high-pressure reaction vessel. A glass slide measuring 22 mm×40 mm×0.15 mm was then immersed into the solution in the Teflon-lined vessel such that the glass slide was positioned with its long axis approximately vertical. The length of the glass (40 mm) was slightly longer than the internal height of the Teflon liner (38 mm), such that placing the Teflon lid onto the liner caused the glass to bend.

[0025]Once the stainless-steel outer vessel was sealed, the reaction vessel was placed in a pre-heated oven at 165° C., and allowed to stand undisturbed for 2.5 hours. It was then removed from the oven and al...

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Abstract

As asymmetric porous film structure formed by depositing a porous material film on a flexible substrate, and applying an anisotropic stress to the porous media on the flexible substrate, where the anisotropic stress results from a stress such as an applied mechanical force, a thermal gradient, and an applied voltage, to form an asymmetric porous material.

Description

RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 511,095. Entitled “Preparation of Asymmetric Porous Materials,” filed on Jul. 29, 2009, which is a continuation-in-part application of U.S. patent application Ser. No. 11 / 501,199, entitled “Nanocasting Method to Prepare Porous Materials,” filed on Aug. 8, 2006, and claims priority to and the benefit of the filing of said U.S. Patent Applications. The specification and claims thereof are incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]This invention was made with Government support under Contract No. DE-AC04-94AL85000 awarded by the Department of Energy. The Government has certain rights in the invention.BACKGROUND OF THE INVENTION[0003]The invention describes a method for preparing porous materials and, more particularly, to a method for preparing materials with a controlled, asymmetric, three-dimensional porous structure.[0004]Mic...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B32B5/18B01D59/14B01J32/00B01D69/12
CPCB01D67/0051B01D67/0083B01D67/0086B82Y30/00B01D2325/022B29C44/56B29C67/202B01D71/028Y10T428/24997Y10T428/249969Y10T428/249978B01D71/0281B01D53/228
InventorCOKER, ERIC N.
OwnerSANDIA