Abhinav Maheswaran Pragatheeswaran

6 Questions 18 Answers 0 Followers

Questions related from Abhinav Maheswaran Pragatheeswaran

I am looking for dyes/any material which can give visible color change when surfactant is added to the water. Any idea?

Hi. The objective is to demonstrate to students that surfactant solutions can solubilize dirt/hydrophobic substances. So, I am looking for dyes/any material which can show visible change in color...

23 March 2016 2,170 5 View

How to measure the stability of foaming of surfactant solution ?

I would like to measure the foam height and stability of surfactant solution. Is there any tailor made instrument to do that? - Thanks in advance :)

25 March 2015 8,993 7 View

Why are anionic surfactants better in cleansing and foaming than non-ionic or cationic ?

It is well known that anionic surfactants are good in terms of foaming and cleansing. Cationics on the the other hand are very bad at cleansing. Why??

08 March 2015 3,802 16 View

Why G'' has bad repeatability while G' has good repeatability in oscillatory stress sweep?

I work on polymer gels. The yield stress is ~100 Pa. Below 100 Pa, both G' and G'' show plateau wrt stress. But the G'' plateau fluctuates from run to run while G' does not. Can anyone explain...

03 February 2015 760 7 View

What is the difference between right-side-up and upside-down centrifuging?

I see these two terms when people use centrifuge to mix polymers with each other.

28 April 2014 3,859 0 View

For Poly(acrylic acid) dissolved in D2O, I do not get any peak for -COOH group in H-NMR spectra. Why ?

Similarly for Poly(ethylene oxide) dissolved in D2O, I do not get any peak for -OH group. Please clarify. Thanks in advance

22 April 2014 8,118 7 View