Banca de DEFESA: ADRIANO ANANIAS DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ADRIANO ANANIAS DA SILVA
DATE: 30/08/2024
TIME: 08:30
LOCAL: Sala de Runiões do IQB
TITLE:

Enhancement of Latent Fingerprints Using Fluorescent Nanoparticles Based on Chitosan-Modified Mesoporous Silica

KEY WORDS:

Latent fingerprints; Nanomaterials; Mesoporous silica; Chitosan; Lipophilicity

PAGES: 100
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The powder method for fingerprinting is the most commonly used conventional method worldwide for revealing latent fingerprints due to several advantages such as simplicity, speed, ease of handling, and the possibility of application at the crime scene. However, traditional powders, despite significant advances, still present some disadvantages or limitations, mainly related to low contrast and low sensitivity. In recent years, in order to overcome these limitations, forensic research, combined with nanotechnology, has focused considerable attention on the development of fluorescent nanopowders as an alternative to conventional powders for revealing latent fingerprints. Among the various types of nanomaterials being developed, such as quantum dots, carbon dots, and lanthanide-doped nanomaterials, fluorescent nanomaterials based on mesoporous silica matrix have been identified as one of the most promising due to a series of advantages such as high fluorescence stability, controlled size, high pore volume, low toxicity, and easy surface modification. Recently, it has also been reported that hydrophobicity or lipophilicity is an important parameter for the fingerprint detection mechanism, as fingerprints have lipids as their main organic component. In this regard, surface modification of mesoporous silica nanoparticles with hydrophobic molecules or functional groups has become an important tool for detecting latent fingerprints by allowing greater affinity between the revealing agent and the lipid components of the fingerprint. Chitosan, a biopolymer with high bioadhesive potential, has been reported as a surface modifier capable of increasing the lipophilicity of mesoporous silica nanoparticles; however, there are no reports in the literature of the investigation of this type of nanomaterial in forensic applications. Therefore, considering all that has been discussed, this work aimed to synthesize fluorescent nanoparticles based on mesoporous silica modified with chitosan in order to evaluate the effect of this modification on the enhancement of latent fingerprints on different nonporous substrates.

COMMITTEE MEMBERS:
Interno(a) - 1543737 - ADRIANA SANTOS RIBEIRO
Interno(a) - 2343745 - JULIO COSME SANTOS DA SILVA
Externo(a) ao Programa - ***.454.134-** - ALEXANDRO MANGUEIRA LIMA DE ASSIS - Outros(as)
Externo(a) ao Programa - ***.271.444-** - LAÍS FARIAS AZEVEDO DE MAGALHÃES OLIVEIRA - UFAL