Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 417, Issue -, Pages 317-324Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.11.039
Keywords
Titania film formation; Crack pattern; Gelation
Categories
Funding
- National Physical Laboratory
- EPSRC
- Royal Society Industry Fellowship
- Engineering and Physical Sciences Research Council [EP/J007404/1] Funding Source: researchfish
- EPSRC [EP/J007404/1] Funding Source: UKRI
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We present an experimental investigation into how altering the inter-particle potential between colloids affects the cracking of a ca. 100 mu m film deposited on a hard substrate. The colloidal material used was titanium dioxide (r approximate to 30 nm) in an aqueous solvent with interaction strength being adjusted through alteration of the pH away from the isoelectric point. Stable suspensions were observed to form as surface charging increased. Drop casting was used to demonstrate the flow properties of the suspensions; doctor-bladed strips of suspension were subsequently imaged to capture the drying dynamics. Alteration of the pH between 3 and 4 resulted in significant changes in cracking patterns, with the normalised crack domain area alpha = root A/h increasing for unstable suspensions (pH 4) and the appearance of order in the initial crack pattern for stable suspensions (pH 3). These results can be unified in terms of the barrier to nucleate a new crack. (C) 2013 Elsevier Inc. All rights reserved.
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