Fingerprint and Inkjet-trace Imaging using Disulfur Dinitride Kelly et. al. Chemical Communications.
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Transcript of Fingerprint and Inkjet-trace Imaging using Disulfur Dinitride Kelly et. al. Chemical Communications.
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- Fingerprint and Inkjet-trace Imaging using Disulfur Dinitride Kelly et. al. Chemical Communications
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- ? ? ? ? ? ? Forensics and Fingerprints o Why Fingerprints? o Fingerprint Detection o Fingerprint Formation o Powder dusting o Ninhydrin reaction o Lawsone reaction o Multi-metal deposition Sodhi, G.S., Kaur, J. Fingermarks detection by eosin-blue dye, Forensics International, 2001, 115, 69-71 Zhang et. al. SECM imaging of MMD-enhanced latent fingermarks, Chem Comm, 2007, 3948-3950 Jelly et. al., Lawsone: a novel reagent for the detection of latent fingermarks on paper surfaces, Chem Comm, 2008, 3513-3515 Kelly et. al. Fingerprint and inkjet-trace imaging using disulfur dinitride, Chem Comm, 2008, 6111-6113 http://www.forensi-tech.com/products/technotes/graphics/1-2720_min.jpg
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- Fingerprints and Disulfur Dinitride (S 2 N 2 ) o Surfaces/Media o Non-invasive to evidence o Clear images o Short developing time o Quality of fingerprints Kelly et. al. Fingerprint and inkjet-trace imaging using disulfur dinitride, Chem Comm, 2008, 6111-6113
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- Properties of Disulfur Dinitride o Structure o Cyclic square planar o 6 -electron system o Diradical o Physical Characteristics o Color o Explosive Bond Lengths = 1.74 S-N, 1.54 S=N Bond Lengths = 1.64 S=N Mikulski, C.M. et. al. Synthesis and structure of metallic polymeric sulfur nitride (SN) x and its precursor, disulfur dinitride, S 2 N 2, Journal of the American Chemical Society, 1975, 6358-6363 Mueller, H. et. al. In situ, time-resolved x-ray diffraction study of the solid-state polymerization of disulfur dinitride to poly(sulfur nitride), Inorg. Chem., 1996, 36, 1488-1494 Banister, A.J., Gorrell, I.B. Poly(sulfur nitride): The first polymeric metal, Adv. Mater., 1998, 10, 1415-1429 Chivers, Tristram. A Guide to Chalcogen-Nitrogen Chemistry, World Scientific, 2005, 53-55
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- Polymerization of S 2 N 2 to polythiazyl (SN) x 1 2 3 4 Mikulski, C.M. et. al. Synthesis and structure of metallic polymeric sulfur nitride (SN) x and its precursor, disulfur dinitride, S 2 N 2, Journal of the American Chemical Society, 1975, 6358-6363 Chivers, Tristram. A Guide to Chalcogen-Nitrogen Chemistry, World Scientific, 2005, 53-55 Mueller, H. et. al. In situ, time-resolved x-ray diffraction study of the solid-state polymerization of disulfur dinitride to poly(sulfur nitride), Inorg. Chem., 1996, 36, 1488-1494 106.2 119.9 1.59 1.63
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- Properties of Polythiazyl (SN) x o Anisotropic Crystal o Polymeric Metal Mikulski, C.M. et. al. Synthesis and structure of metallic polymeric sulfur nitride (SN) x and its precursor, disulfur dinitride, S 2 N 2, Journal of the American Chemical Society, 1975, 6358-6363 Mueller, H. et. al. In situ, time-resolved x-ray diffraction study of the solid-state polymerization of disulfur dinitride to poly(sulfur nitride), Inorg. Chem., 1996, 36, 1488-1494 Banister, A.J., Gorrell, I.B. Poly(sulfur nitride): The first polymeric metal, Adv. Mater., 1998, 10, 1415-1429 Chivers, Tristram. A Guide to Chalcogen-Nitrogen Chemistry, World Scientific, 2005, 53-55 o Orientation o Polarized Light o Electron Arrangement
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- Properties of Polythiazyl (SN) x o Conductivity o Solid-state devices o Electrodes o Stability o Electronegativity Mikulski, C.M. et. al. Synthesis and structure of metallic polymeric sulfur nitride (SN) x and its precursor, disulfur dinitride, S 2 N 2, Journal of the American Chemical Society, 1975, 6358-6363 Mueller, H. et. al. In situ, time-resolved x-ray diffraction study of the solid-state polymerization of disulfur dinitride to poly(sulfur nitride), Inorg. Chem., 1996, 36, 1488-1494 Banister, A.J., Gorrell, I.B. Poly(sulfur nitride): The first polymeric metal, Adv. Mater., 1998, 10, 1415-1429 Chivers, Tristram. A Guide to Chalcogen-Nitrogen Chemistry, World Scientific, 2005, 53-55
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- Importance o Applications o Forensics o Fingerprints o Inkjet-trace imaging http://www.rsc.org/chemistryworld/News/2007/July/13070701.asp
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- Techniques Starting Material ConditionsProduct S 4 N 4 Thermal cracking Microcrystalline over silver woolpolymer [S 5 N 5 ] + Electrolysis in Microcrystalline sulfur dioxide or polymer acetonitrile (NSCl) 3 & Acetonitrile at Powdered trimethylsilyl azide - 15 C polymer Banister, A.J., Gorrell, I.B. Poly(sulfur nitride): The first polymeric metal, Adv. Mater., 1998, 10, 1415-1429 Chivers, Tristram. A Guide to Chalcogen-Nitrogen Chemistry, World Scientific, 2005, 53-55 Kelly et. al., Rapid polymerization of S 2 N 2 within Na-ZSM-f channels, Chem Comm, 2007, 4812-4814
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- Experimental Rapid polymerization of S 2 N 2 within Na-ZSM-5 channels Kelly et. al.Polymerization of S 2 N 2 to (SN) x General Experimental Mueller et. al., In situ, time-resolved x-ray diffraction study of the solid-state polymerization of disulfur dinitride t poly (sulfur nitride), Inorg Chem, 1996, 36, 1488-1494
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- Results o S 2 N 2 (SN) x o Zeolite o Conductivity o Glassware Na-ZSM-5 after S 2 N 2 exposure (SN) x Kelly et. al., Rapid polymerization of S 2 N 2 within Na-ZSM-f channels, Chem Comm, 2007, 4812- 4814
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- Investigation of S 2 N 2 vapours on fingerprints o Materials o Fingerprints o Qualitative o Quantitative Growth on fingerprints (SN) x Kelly et. al.,Fingerprint and inkjet-trace Imaging using disulfur dinitride, Chem Comm, 2008, 6111-6113
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- Conclusions o Polymerization o Fingerprints o Forensics o Positives o Negatives Kelly et. al.,Fingerprint and inkjet-trace Imaging using disulfur dinitride, Chem Comm, 2008, 6111-6113 http://www.rsc.org/chemistryworld/News/2007/July/13070701.asp
- Slide 14
- Investigation of S 2 N 2 vapours on inkjet o Materials o Preparation o Mechanism o Qualitative o Quantitative Kelly et. al.,Fingerprint and inkjet-trace Imaging using disulfur dinitride, Chem Comm, 2008, 6111-6113