Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and

Forensic differentiation of paper by

X-ray diffraction and infrared spectroscopy

Valerio Causin a,*, Carla Marega a, Antonio Marigo a, Rosario Casamassima b, Giuseppe Peluso b,Luigi Ripani ba Dipartimento di Scienze Chimiche dell’Universita`, via Marzolo 1, 35131 Padova, Italy

b Sezione di Chimica, Esplosivi ed Infiammabili, Reparto Carabinieri Investigazioni Scientifiche, Viale Tor di Quinto 151, 00191 Roma, Italy

By Nuttapong Tatiyakeattavorn

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Plantation

Paper process

Paper process

Pigment dye

cellulose (alkyl ketene dimmer, AKD)

Polyacrylamide

Tetra-amino-stibene-tetrasulfonic acid (universal type) Anionic direct dye

Paper chemical

FTIR spectrometer

www.physik.tu-berlin.de

x-ray diffractometer

www.thps.org

FTIR spectra

Characterization data obtained from the IR spectra and the WAXD patterns of the paper samples.

= 97.6%

WAXD spectra of sample N

WAXD spectra

Crystallinity was thus evaluated as the ratio between the area of crystalline peaks over the total area of the diffractograms

Characterization data obtained from the IR spectra and the WAXD patterns of the paper samples.

= 95.3 %

WAXD spectra

WAXD spectra of samples B, C, F and R (a) in the whole angular range and (b) magnifying the

region of the inorganic peaks. Minor peaks useful for differentiation of the samples are indicated by *. All the samples were mounted in the perpendicular direction

conclusion

= 99.0 %

= 97.6%

= 95.3 %

DP FTIR

DP XRD

DP FTIR,XRD

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