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 b a 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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$Page 1: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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

$Page 2: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

��

$Page 3: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

Plantation

$Page 4: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

Paper process

$Page 5: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

Paper process

$Page 6: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

Pigment dye

cellulose (alkyl ketene dimmer, AKD)

Polyacrylamide

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

Paper chemical

$Page 7: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

FTIR spectrometer

www.physik.tu-berlin.de

$Page 8: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

x-ray diffractometer

www.thps.org

$Page 9: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

FTIR spectra

$Page 10: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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

= 97.6%

$Page 11: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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

$Page 12: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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

= 95.3 %

$Page 13: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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

$Page 14: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

conclusion

= 99.0 %

= 97.6%

= 95.3 %

DP FTIR

DP XRD

DP FTIR,XRD

$Page 15: Forensic differentiation of paper by X-ray diffraction and ...forensic.sc.su.ac.th/seminar/seminari53/ppt/52312309.pdf · Forensic differentiation of paper by X-ray diffraction and$

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