Daniel B Rego

3 Questions 5 Answers 0 Followers

Questions related from Daniel B Rego

DMSO not freezing when put into freezer while hot, but will freeze when put into the freezer while cold

When I pour DMSO at room temperature into a Teflon dish and immediately put it in a freezer at -20 degrees C, it freezes fine. However, when I pour DMSO at 90 degrees C and similarly pour it into...

23 May 2017 6,234 8 View

Problem removing a cast polymer film from dish in one piece?

I'm making a poly(lactic-co-glycolic acid) film from CH2Cl2 in a flat aluminum dish. The film itself is fine, but sticks to the dish to the point of having to stretch and even warp the film....

22 December 2016 2,623 4 View

Zeta potential measurement of a solid surface?

I need to measure the zeta-potential and/or surface charge on solid samples (e.g. polymer sheets, cements, &c.). Most of the instruments and literature techniques involve colloids or...

01 September 2016 5,425 11 View