Tag Archives: Surface Science

Particles on Surfaces: Part 2 – The Ties That Bind

In Particles on Surfaces – Part 1, witness wafer and settling plate data showed that particles and bacteria (i.e. viable particles) will settle on cleanroom surfaces. From this we can infer that particles do NOT behave as hard microscopic billiard balls, striking surfaces and rebounding into the air. Rather, through inelastic collisions with the surface, they [Read More…]

Particles on Surfaces: Part 1 – Next to Godliness


Surely cleanrooms qualify. Air filtered everywhere. Operators garbed from head to foot with only a portion of their faces exposed.  Spotless stainless steel and plastic surfaces everywhere. No paper or cardboard anywhere. Manufactured product protected. Surely this is cleanliness next to Godliness. Appearances are deceiving. Despite the advances made in the High Efficiency Particle Air [Read More…]

“Lint-Free” Wipes: Available Only Through Your Fairy Godmother

Lint Free Wipes

Web searches for “Lint Free Wipes” provide some interesting information.  A Google search returns 82,300 hits. A search of “lint-free” on the American Society for Testing Materials (ASTM) site returns 265 hits, and a search of “lint-free” on the United States Pharmacopeia (USP) site returns 737 hits. Of these, three are contained in the <797> document on [Read More…]

Big Problems with Small Ions


The Issue Of Ion Contamination In Electronics Manufacturing Processes Is Of Critical Importance. Therefore It Is Incumbent On Manufacturers To Be Vigilant In Detecting And Minimizing Ionic Contamination. By Howard Siegerman, Ph.D BIG PROBLEMS WITH SMALL IONS THE ISSUE OF ION CONTAMINATION in microelectronics is of critical importance because electronic device failures have been directly linked [Read More…]