Browse Prior Art Database

Method of Quantitatively Detecting Particles On Surfaces

IP.com Disclosure Number: IPCOM000062755D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Ko, M: AUTHOR

Abstract

The following is a method to detect particulate contaminants. This method uses filtration technique to collect all particles onto a filter membrane. The membrane is thereafter dissolved into a solvent to release all the collected particles, which can then be easily detected, tested and measured by liquid particle counter, such as turbidity meter.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Method of Quantitatively Detecting Particles On Surfaces

The following is a method to detect particulate contaminants. This method uses filtration technique to collect all particles onto a filter membrane. The membrane is thereafter dissolved into a solvent to release all the collected particles, which can then be easily detected, tested and measured by liquid particle counter, such as turbidity meter.

Many extraction fluids can be used. Deionized water with small amount of surfactant is usually adequate. Freon solvents can also be used instead of water.

The choice of filter membrane is important. The membrane can be cellulose acetate, cellulose nitrate. The membrane should be effective in adhering fine particles, but adequately dissolved in suitable solvent or solvent blends.

The liquid particle counters can be turbidity meter, hazemeter, nephocolorimeter, colorimeter, fluorimeter, laser part counters, UV particle counters, etc.

The method can be applied on any metal, plastic, elastomeric and fibrous surfaces or materials.

Thirty solvents were evaluated. The best ones are methyl sulfoxide, N- methylpyrrolidone, morpholine, dioxane and acetone.

Disclosed anonymously.

1