Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 28, 2015
Previous Article Next Article

Introducing a high gravity field to enhance infiltration of small molecules into polyelectrolyte multilayers

Author affiliations

Abstract

Loading functional small molecules into nano-thin films is fundamental to various research fields such as membrane separation, molecular imprinting, interfacial reaction, drug delivery etc. Currently, a general demand for enhancing the loading rate without affecting the film structures exists in most infiltration phenomena. To handle this issue, we have introduced a process intensification method of a high gravity technique, which is a versatile energy form of mechanical field well-established in industry, into the investigations on diffusion/infiltration at the molecular level. By taking a polyelectrolyte multilayer as a model thin film and a photo-reactive molecule, 4,4′-diazostilbene-2,2′-disulfonic acid disodium salt (DAS), as a model small functional molecule, we have demonstrated remarkably accelerated adsorption/infiltration of DAS into a poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) multilayer by as high as 20-fold; meanwhile, both the film property of the multilayer and photoresponsive-crosslinking function of DAS were not disturbed. Furthermore, the infiltration of DAS and the surface morphology of the multilayer could be tuned based on their high dependence on the intensity of the high gravity field regarding different rotating speeds. The mechanism of the accelerated adsorption/infiltration under the high gravity field was interpreted by the increased turbulence of the diffusing layer with the thinned laminar boundary layer and the stepwise delivery of the local concentration gradient from the solution to the interior of the multilayer. The introduction of mechanical field provides a simple and versatile strategy to address the paradox of the contradictory loading amount and loading rate, and thus to promote applications of various membrane processes.

Graphical abstract: Introducing a high gravity field to enhance infiltration of small molecules into polyelectrolyte multilayers

Back to tab navigation

Supplementary files

Article information


Submitted
03 May 2015
Accepted
11 Jun 2015
First published
18 Jun 2015

Soft Matter, 2015,11, 5748-5753
Article type
Paper

Introducing a high gravity field to enhance infiltration of small molecules into polyelectrolyte multilayers

X. Liu, K. Zhao, C. Jiang, Y. Wang, L. Shao, Y. Zhang and F. Shi, Soft Matter, 2015, 11, 5748
DOI: 10.1039/C5SM01055A

Social activity

Search articles by author

Spotlight

Advertisements