Featured Posts

This page contains those Top Posts that would otherwise be hard to find in a chronological blog page. For the latest posts, click the blog roll.

Pchem4all Podcast

On Podbean, this podcast features audio from some of Dr. Williams’ lectures, Q&A sessions, and office hours. There are surely some gems of pchem and insights into the glorious world around us.


What is Pchem, why do I love it, and who am I?

Teaching and Education

Excel Boot Camp Videos – I am creating a series of Excel tutorial videos on YouTube to help my students (and anyone else) learn Excel for scientific data analysis. To find all the tutorial posts use the Excel Boot Camp Tag.

Physical Chemistry Lecture Videos – My students captured my lectures for the 2017-2018 academic year and posted them the the Physical Chemistry at Sam Channel.

Forensic Chemistry Lecture Videos – Jessy Stone created the Forensic Chemistry at Sam Channel as an SHSU Honors Contract for the course – an activity that supplements the material for the student and enhances the skills that they take away from the course.

Research and the Betterment of Society

Glove Selection – Perhaps your lab is typical in selecting nitrile gloves for everything. Changes are made when one loses a finger (of a glove) in a beaker of solvent. This is not the best practice, but many will not believe me when I say that there is an “easy alternative” to the “lost-finger” selection scheme.

Contact Angle Measurement – Measurement of contact angles often provides valuable information as to the cleanliness of a surface as well as the ease of wetting of a surface with a coating such as paint or other organic species. Previous methods based on use of a sessile drop were subject to considerable operator error. In order to minimize such errors, the computer-based analysis of drop shape has been developed. The use of such software which is Windows-compatible and easy to learn, is described, giving results where operator-error is minimized. The method has considerable potential for Quality Control in surface finishing.

Solvent Substitution (Part 1) (Part 2) – Part one of this article examines two cleaners including a hydrofluoroether (HFE) and a hydrofluorocarbon (HFC) currently being considered as potential replacements for flammable solvents. Cleaning efficacy, short-term and long-term materials compatibility, corrosion, drying times, flammability, environment, safety and health (ES&H) issues and accelerated aging studies are among the tests that are being conducted and that are used to screen candidate solvents. Part two, appearing in the October issue features the results, which are compared to the traditionally used isopropyl alcohol, which serves as the baseline cleaner.

Nerd Fun

Yes, my hobby is Excel.

Other social sites I’m on…
Gab Social

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