IR, I used to think that osmosis was a concentration gradient driven process, i.e. diffusion, as well. Turns out, there is considerably controversy on this subject. As an example from one of the papers that I read, they mention that there are solutes known to *increase* the concentration of...
Yeah, it's coming out of the cell walls due to osmosis, but probably not via diffusion... Probably via bulk flow through "holes" in the cell wall (aquaporins). The rapid destruction of red blood cells when placed in DI water was one of the motivators that suggested there were water channels in...
Yeah, I would, too... But I have been researching water diffusion through polymers with regard to osmosis and I've found some interesting papers that state rather emphatically that water flow due to osmosis is bulk flow rather than diffusion. Makes sense, when you consider that a hydrostatic...
Hi IRstuff, the question is dry for how long?? Dry is relative. There's very few materials that would keep it bone dry forever, and none of them are polymers. If I don't understand the mechanism of intrusion, I can't predict the relative performance of various implementations.
Hi patprimmer...
Hi Demon3, thanks for the quick response!
Yes, the purpose of the modeling is to predict something. There are many variables in the system I'm describing that I can manipulate that I didn't go into here: the polymer, of course, the composition of the analyte, the allowable amount of water...
Hi Guys,
I have a problem that I'm a bit stumped with...
I have a polymer surrounding an analyte that I wish to keep dry. Think of an M&M, where the chocolate is the analyte and the candy coating is the polymer. The unit will be submersed in salt water. I'm trying to model the rate of...
