In my previous missive about Loss-On drying, we discussed Vapor Pressure -- because logically it was next. As we continue to explore moisture, we learn how vital vapor pressure is when regarding the quirky issues of free and bound water.
CSC Scientific Blog
You may recall that I promised to offer my interpretation as to how Surface Tension is related to Viscosity.
To begin with, liquid surface tension and viscosity share a common trait: they both involve properties of fluids. After that, things start to get murky.
“My duNouy ring kept falling off the arm hook when attempting to immerse it into a high-viscosity sample.”
When I tell people at cocktail parties that we specialize in Particle-Size Analysis. I usually get a polite response of ------ “OH !!,” which translates to “So who cares?”
One quiet night, I was musing over moisture analysis and how easy it is to do using loss-on drying. Little did I know what was in store.
When tempted to think I know all there is about surface tension measurement, further information brings me back to earth. I’m conversant with the principal applications: surfactant analysis, plating, detecting contaminants, development of ink and the like. I have assisted customers to set up and calibrate duNouy Ring tensiometers for most applications -- all the while taking for granted that the Ring technique was the method of choice -- with only infrequent questions arising about Wilhelmy Plate tensiometers.
The relative value of a sieve certification process vs a sieve calibration has perplexed me for a long time.
When people are looking for a way to measure small amounts of moisture, we often recommend the Karl Fischer method.
I'll bet that most of you have experienced the shock of walking on a thick wool rug on a dry winter's day and getting zapped out of your reverie when reaching for the metal door knob.
The same process of static electricity generation can play havoc with your sieving process.