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Nanoscale Analysis of the Interaction Between Cyanoacrylate and Vacuum Metal Deposition in the Development of Latent Fingermarks on Low-Density Polyethylene

Jones, Benjamin, Downham, R and Sears, V.G. (2012) Nanoscale Analysis of the Interaction Between Cyanoacrylate and Vacuum Metal Deposition in the Development of Latent Fingermarks on Low-Density Polyethylene. Journal of Forensic Sciences, 57 (1). pp. 196-200. ISSN 0022-1198

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Abstract

Vacuum metal deposition (VMD) has been previously demonstrated as an effective development technique for latent fingermarks and in some cases has been shown to enhance prints developed with cyanoacrylate (CA) (superglue) fuming. This work utilizes scanning electron microscopy (SEM) to investigate the interactions of the two development techniques when applied to latent fingermarks on low-density polyethylene. CA is shown to act principally on the eccrine deposits around sweat pores, where polymerization results in long polymer fibrils a few 100 nm in width. Subsequent VMD processing results in additional areas of development, for example, between pores. However, the primary mode of deposition of zinc is by interaction with the polymerized CA, the fibrils of which become decorated with zinc nanoparticles. Areas with limited CA deposition and no significant polymerization are also enhanced with the VMD process, resulting in increased print development.

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Item Type: Article
Uncontrolled Keywords: forensic science; latent fingermark; cyanoacrylate fuming; vacuum metal deposition; nanoparticle; microscopy; superglue; friction ridge impression; fingerprints
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TP Chemical technology
Schools: School of Applied Sciences
References:

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Depositing User: Ben Jones
Date Deposited: 11 Dec 2013 12:59
Last Modified: 04 Nov 2015 23:50
URI: http://eprints.hud.ac.uk/id/eprint/19313

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