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Surface modification of solid supports through thermal decomposition and functionalization of silanes

A technology for modifying and substrate surface, applied in the direction of silicon compounds, physical/chemical process catalysts, chemical methods for reacting gases with non-granular solids, etc., can solve problems such as poor surface activity and difficult removal

Inactive Publication Date: 2002-07-03
RESTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complete removal of this catalyst from processing systems is very difficult and traces of catalyst will again produce poor surface activity

Method used

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  • Surface modification of solid supports through thermal decomposition and functionalization of silanes
  • Surface modification of solid supports through thermal decomposition and functionalization of silanes

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Borosilicate inlet liners are used in gas chromatographic devices as the sample introduction region and transfer to the gas chromatographic column. Due to their active surface and their adsorptive properties for many compounds, coarse borosilicate glasses are typically deactivated by silanization. Standard silanization will provide a relatively inert surface, but will not be generally inert to acidic as well as basic compounds (eg, carboxylic acids and amines). Some liners are suitable for acidic compounds and a few for basic compounds. The present invention provides a surface that prevents adsorption of acidic and basic compounds on the inlet liner surface.

[0034] The borosilicate inlet liner is packed in a sealed stainless steel container with inlet and outlet tubing attached. The tubes pass through the oven celling and are connected to two separate manifolds through which aeration and vacuum will be applied to the vessel by a system of valves. With atmospheric p...

Embodiment 2

[0035] Uncoated fused silica capillary columns are used in gas chromatographic apparatus as inlet transfer lines connecting the inlet liner to coated fused silica capillary analytical columns. Coarse fused silica glass is typically deactivated by silanization because of its active surface and its adsorptive properties for many compounds. Standard silanization processes will produce relatively inert surfaces, but are not inert to all acidic and basic compounds (eg, carboxylic acids and amines). Some deactivated fused silica columns are suitable for acidic compounds and a few types are suitable for basic compounds. Also, general deactivation is not durable in repeated corrosive environments. The present invention produces a surface on fused silica capillaries that will prevent the adsorption of acidic or basic compounds, as well as resist decomposition by corrosive environments.

[0036] Fused silica capillary tubes were coiled and connected in lengths of 30 m, the ends of whi...

Embodiment 3

[0038] Steel containers are best used to store low levels of sulfur compounds such as hydrogen sulfide and mercaptans. Steel is highly adsorbent for such compounds, making it an unsuitable storage medium for low parts per billion concentrations. The present invention will provide a surface that will prevent the adsorption of low levels of sulfur compounds on the surface of steel vessels.

[0039] The steel vessel is encased in a large stainless steel hermetic container which is sealed and connected with inlet and outlet pipes. The tubes pass through the oven chamber and are connected to two separate manifolds through which inflation and vacuum can be performed via a system of valves. With the air pressure in the vessel at atmospheric pressure, the temperature in the vessel was raised to 120°C and maintained for 1 hour. After 1 hour, the vessel was inert by nitrogen purge and evacuated. The vessel was heated to 400°C. After the container is evacuated, 100% silane gas (SiH ...

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Abstract

A process of modifiying a solid's surface, comprising a first step of depositing hydrogenated armophous silicon on the surface by thermal decomposition at an elevated temperature of silicon hydride gas to form sila ne radicals which recombine to coat the surface with hydrogenated armophous silicon. A second step of surface funtionalization of the hydrogenated armophous silicon in the presence of a binding agent including hydrosilylation, disproportionation and radical quenching.

Description

[0001] related application [0002] This application claims priority to co-pending patent application Ser. No. 60 / 122,990, filed 4 / 1 / 99, entitled: "Surface Modification of Solid Supports by Thermal Decomposition and Functionalization of Silanes," by David Abbott Smith. technical field [0003] The present invention relates to a method of depositing a layer of hydrogenated amorphous silicon (a-SiH) on a substrate, followed by reaction of unsaturated reagents to modify the surface, including but not limited to, acidic, basic and neutral Inertness to aggressive compounds, resistance to aggressive environments, and wettability to other compounds. Surface modification can also be achieved using free radical inhibition methods. technical background [0004] The present invention was developed to overcome the inherent undesirable molecular activity of metals (ferrous and non-ferrous), glass, and ceramic surfaces, which would lead to (a) chemisorption of other molecules, (b) revers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J15/00B01J20/10B01J31/02B32B5/02B32B9/04C08L83/05C23C16/24C23C16/30C23C16/42
CPCC09D183/16Y10T428/31663Y10T428/31612C23C16/24C23C16/402C23C16/56
Inventor 戴维·阿博特·史密斯
Owner RESTEK
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