Banca de QUALIFICAÇÃO: ANA KAROLYNE LOBO BEZERRA ABE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ANA KAROLYNE LOBO BEZERRA ABE
DATE: 30/04/2025
TIME: 08:30
LOCAL: LABCIM
TITLE:

Reproduction and Analysis of Silica Microcapsules for Self-Healing in Oil Well Cracks.

KEY WORDS:

Microcapsules; Self-healing; Smart materials; Cementing

PAGES: 130
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Engenharia Térmica
SPECIALTY: Aproveitamento da Energia
SUMMARY:

Self-healing materials, considered "smart materials," can utilize microcapsules containing chemical agents that activate upon contact with cracks or fissures, promoting self-repair. This study aims to replicate the synthesis of silica microcapsules encapsulated in epoxy resin and methyl ethyl ketone peroxide, as developed by Oliveira (2024). The objectives are to optimize the synthesis conditions of these microcapsules for their application as additives in cementitious matrices, evaluate the self-healing capacity in cracks and fissures, and identify, through micrographs, the occurrence of products resulting from cement hydration. The methodology was divided into two stages: in the first stage, silica microcapsules were synthesized using Tetraethyl Orthosilicate (TEOS), hydrochloric acid (HCl), epoxy resin, and MEKP, followed by processes of centrifugation, washing, and drying. In the second stage, these microcapsules were incorporated into class G cement pastes, molded into test specimens, and cured for 28 days. After drying and inducing cracks, the specimens were characterized by Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) to evaluate morphology, distribution, and self-healing effectiveness.The results indicated that the microcapsules encapsulated with epoxy resin exhibited a smooth morphology and dimensions ranging from 100 to 500 μm, while those with peroxide ranged from 20 to 100 μm. The porosity of the microcapsules was influenced by the ratio of TEOS to water, and the chemical composition revealed the presence of silicon (Si), carbon (C), and oxygen (O). The concentration of silicon at the edges of the cracks suggests interaction with the environment, enhancing self-repair. Although the yield obtained (0.8 to 1 g) was lower than that reported by Oliveira (2024), the study underscores the importance of optimizing synthesis conditions to improve the effectiveness of microcapsules in self-healing applications in cementitious matrices.

COMMITTEE MEMBERS:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Interno - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo à Instituição - RAFAEL DA SILVA FERNANDES - UFRN