Hello everyone,
Greetings!
I would appreciate any guide about etchant for modifying polymer film surface.
I like to modify surface roughness (random) of poly(vinyl alcohol) films. I was wondering if there is any wet(chemicals like strong acid or base) or dry (plasma or ion beam) etching...
Dear colleagues,
I got few questions and would appreciate your reply
For the UNIQUAC model
Water parmeters (1):
r= 0.92 and q = 1.14, q'=1.4
ethylene glycol parmeters (2)
r = 2.4088 and q = 2.2488, q'=0.4761 (could anybody confirm?)
I need to find the the binary parmeters (a12 and a21) at...
Well for a sessile drop (say, liquid A) the surrounding atmosphere is (generally) air; for captive bubble the surrounding is not air for sure...............
It also partially depends on the size or volume of your drop.
You have to be careful about the test conditions and probing liquid for any...
What is the difference between surface energy and surface free energy, in terms of physics?
I found surface energy of a solid sometimes refers to the surface tension and they have equivalent units.
However, I am confused about surface free energy....any help would be appreciated. Thanks.
Thanks ibmem.............however My question was what is the SORPTION process, physically?
SORPTION =
Also, why swelling[Is this due to Absorption of permeates?] occurs?
I know what is the after effects of swelling.
I am little confused about sorption process in pervaporation. Is "Sorption= Adsorption + Absorption" ?
In dehydration process, if water molecules attach to the surface by adsorption then how they enter the polymer matrix or network (by absorption or solutbility effect)?
Also what is the...
I am looking for commercial Polyvinyl Alcohol (PVA) membranes only for my research. Can you help me to find any company where I can get/buy it.
I've talked with some companies (e.g. VWR, Sulzer, Koch etc) but they are interested in selling whole separation unit and not the membranes only.
