Banca de DEFESA: ANDRÉ AUGUSTO DE ALMEIDA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRÉ AUGUSTO DE ALMEIDA
DATE: 30/10/2023
TIME: 14:00
LOCAL: Auditório do Campus Gameleira
TITLE:

ALTERNATIVE DEVELOPERS DERIVED FROM GRAPHENE OXIDE AND ACTIVATED CARBON FOR FORENSIC PAPILLOSCOPY APPLICATIONS

KEY WORDS:

Chemical developers. Graphene oxide. Activated carbon. Functionalization. Forensic Sciences.

PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Orgânica
SPECIALTY: Síntese Orgânica
SUMMARY:

Among the various methods and techniques that encompass Forensic Sciences, Forensic Papilloscopy is undoubtedly the most used for human identification, using fingerprint analysis to identify individuals. In Forensic Papilloscopy, fingerprint powders are the materials most used in exams due to ease of application, portability and versatility. However, most of these powders are toxic and harmful to professionals' health due to constant exposure, making the work environment unhealthy. Given these premises and in the search for more sustainable and technological solutions, Graphene oxide and Activated carbon are materials with enormous potential to replace conventional powders for fingerprint. Due to the nanometric size of its particles and other characteristics such as high contact surface area and oxygenated functional groups that allow diverse interactions with other substances or materials, Graphene oxide can be used in forensic sciences as a safer and more technological alternative to replace conventional powders, such as carbon black, a potentially carcinogenic product. Activated carbon is a highly porous material obtained from organic raw materials such as wood, coconut, bamboo, among others. It is economical and a more sustainable option than conventional powders. In this context, the present work aimed to evaluate the performance of Graphene oxide, activated carbon and their derivatives obtained by green synthesis for application in the development of fingerprints and other ridge skin impressions. For preliminary evaluation of the performance of Graphene Oxide and Activated Carbon as fingerprint developers, greasy fingerprints and other ridge skin impressions were deposited on glass with moderate force and immediate development. The same methodology was applied to Hi-fi black powder (a classic reference developer) for visual comparison. The use of graphene oxide as developer did not allow the visualization of papillary lines due to the size of the particles. In this case, the starting material was crushed to reduce size and the development test was repeated. However, at this initial stage, Activated carbon showed greater interaction with fingerprint residues, allowing the visualization of ridge lines and some minutiae. Subsequently, Graphene oxide and Activated carbon were oxidized in the presence of Sodium dichloroisocyanurate as an oxidizing agent and ethanol as a solvent, varying the energy sources (ultrasound and microwave irradiation). The oxidized materials were then functionalized using Aminoacetic acid as a reagent and Ethanol as a solvent, under ultrasound or microwave irradiation. Starting materials, intermediates and products were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SME), Energy Dispersive Spectroscopy (EDS) and Raman Spectroscopy. The characterizations of the materials, obtained in the different synthesis stages, allowed us to verify that the oxidation and insertion of the amino group occurred satisfactorily and in accordance with the scientific literature. The results obtained in development tests indicated that the materials produced have the potential to be used as developers to identify fingerprints and other ridge skin impressions, in addition to being safer and obtained through green synthesis.

COMMITTEE MEMBERS:
Interno - CLEVERSON FERNANDO GARCIA
Interna - ANGELA DE MELLO FERREIRA
Interna - ADRIANA AKEMI OKUMA
Externo ao Programa - LEONEL DA SILVA TEIXEIRA
Externo à Instituição - RODRIGO FILETO CUERCI MACIEL - UFMG