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Title: | Nano-scale composition of commercial white powders for development of latent fingerprints on adhesives |
Authors: | Jones, BJ Reynolds, AJ Richardson, M Sears, VG |
Keywords: | Latent fingerprints;Powder suspensions;Electron microscopy;Adhesive tape;Titanium dioxide |
Issue Date: | 2010 |
Publisher: | Elsevier |
Citation: | Science and Justice, 50(3): 150 - 155, Sep 2010 |
Abstract: | Titanium dioxide based powders are regularly used in the development of latent fingerprints on dark surfaces. For analysis of prints on adhesive tapes, the titanium dioxide can be suspended in a surfactant and used in the form of a powder suspension. Commercially available products, whilst having nominally similar composition, show varying levels of effectiveness of print development, with some powders adhering to the background as well as the print. X-ray fluorescence (XRF), analytical transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and laser particle sizing of the fingerprint powders show TiO2 particles with a surrounding coating, tens of nanometres thick, consisting of Al and Si rich material, with traces of sodium and sulphur. Such aluminosilicates are commonly used as anti-caking agents and to aid adhesion or functionality of some fingerprint powders; however, the morphology, thickness, coverage and composition of the aluminosilicates are the primary differences between the white powder formulations and could be related to variation in the efficacy of print development. |
Description: | This is the post-print version of the article - Copyright @ 2010 Elsevier. |
URI: | http://www.sciencedirect.com/science/article/pii/S1355030609001099 http://bura.brunel.ac.uk/handle/2438/5635 |
DOI: | http://dx.doi.org/10.1016/j.scijus.2009.08.001 |
ISSN: | 1355-0306 |
Appears in Collections: | Materials Engineering Publications The Experimental Techniques Centre |
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