Daniel B Rego

4 Questions 5 Answers 0 Followers

Questions related from Daniel B Rego

What are thehemical reactions in Fentanyl "field tests" given by police officers?

Police often have "field tests" to identify the presence, qualitatively, of illegal substances, such as fentanyl. Does anyone know what the "field test" kits for fentanyl are specifically...

03 September 2018 7,910 0 View

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 6,310 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 2,676 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 5,683 11 View