This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1016/j.jcis.2005.07.049 in citations.
Microstructure formation in dip-coated particulate films
Microstructure formation in dip-coated particulate films
The microstructure-dependence of dip-coated particulate thin films on the stability of an aqueous silica sol used as coating bath is studied. Different stability conditions are adjusted in the sol by changing electrolyte concentration and pH value. Care was taken to avoid pronounced aggregation of t...
Saved in:
Personal Name(s): | Guenther, L. |
---|---|
Peukert, W. / Goerigk, G. / Dingenouts, N. | |
Contributing Institute: |
JCNS; JCNS Neutronenstreuung; IFF-INS Streumethoden; IFF-ISM |
Published in: | Journal of colloid and interface science, 294 (2006) S. 309 - 320 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2006
|
Physical Description: |
309 - 320 |
PubMed ID: |
16125187 |
DOI: |
10.1016/j.jcis.2005.07.049 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Kondensierte Materie |
Series Title: |
Journal of Colloid and Interface Science
294 |
Subject (ZB): | |
Publikationsportal JuSER |
The microstructure-dependence of dip-coated particulate thin films on the stability of an aqueous silica sol used as coating bath is studied. Different stability conditions are adjusted in the sol by changing electrolyte concentration and pH value. Care was taken to avoid pronounced aggregation of the particles before the coating process. The characterization of the stability behavior gives clear evidence of a non-DLVO contribution at low pH values that is attributed to hydration forces. Structural evolution of the particulate network during film formation is studied using a dialysis accumulation procedure. The viscosity of the accumulated sol is measured as a function of shear rate and related to the drying characteristic of the coating process. Atomic force microscopy (AFM), small-angle X-ray scattering (SAXS) and N2 sorption are used to obtain information on the surface and volume structure of the dip-coated films. The structure of coatings is found to distinctly vary with stability parameters. This is attributed to changing interactions during the first drying stage. Finally, the influence of coating structures on the light transmission properties is determined. A comparison between the extinction of the uncoated and the coated substrate revealed a difference of up to +/-50% in dependence on the microstructure. |