Evaluation of contact angle and mechanical properties of resin monomers filled with graphene oxide nanofibers

Autor(es)

Marilia Mattar de Amoêdo Campos Velo ^[1] ; Tatiana Rita de Lima Nascimento ^[2] ; Alyssa Teixeira Obeid ^[3] ; Nair Cristina Margarido Brondino ^[4] ; Rafael Francisco Lia Mondelli ^[5]

Afiliação do(s) autor(es)

^[1] Federal University of Paraiba. Department of Chemistry, Research and Extension Center for Fuels and Materials Laboratory - Brasil

^[2] Federal University of Paraíba. Technical School of Health - Brasil

^[3] Federal University of Paraiba. Department of Chemistry, Research and Extension Center for Fuels and Materials Laboratory - Brasil

^[4] São Paulo State University. School of Science, Department of Mathematics - Brasil

^[5] Federal University of Paraiba. Department of Chemistry, Research and Extension Center for Fuels and Materials Laboratory - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 34, n. 4, p. 127-134, 2023-10-27.

Resumo

Abstract This in vitro study synthesized hybrid nanofibers embedded in graphene oxide (GO) and incorporated them into experimental resin composite monomers to evaluate their physical-mechanical properties. Inorganic-organic hybrid nanofibers were produced with precursor solutions of 1% wt. GO-filled Poly (d,l-lactide, PLA) fibers and scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) characterized the morphology and chemical composition of the spun fibers. Resin composite monomers were developed and a total of 5% nanofibers were incorporated into the experimental materials. Three groups were developed: G1 (control resin monomers), G2 (resin monomers/PLA nanofibers), and G3 (resin monomers/inorganic-organic hybrid nanofibers). Contact angle (n=3), flexural strength (n=22), elastic modulus (n=22), and Knoop hardness (n=6) were evaluated. The mean of the three indentations was obtained for each sample. The normality of data was assessed by QQ Plot with simulated envelopes and analyzed by Welch's method (p<0.05). Overall, SEM images showed the regular shape of nanofibers but were non-aligned. Compositional analysis from EDS (n=6) revealed the presence of carbon and oxygen (present in GO composition) and Si from the functionalization process. The results of contact angle (°) and hardness (Kg/mm2) for each group were as follow, respectively: G1 (59.65±2.90; 37.48±1.86a), G2 (67.99±3.93; 50.56±1.03b) and G3 (62.52±7.40; 67.83±1.01c). The group G3 showed the highest Knoop hardness values (67.83 kg/mm2), and the flexural strength of all groups was adversely affected. The experimental resin composite composed of hybrid nanofibers with GO presented increased hardness values and hydrophilic behavior. (AU)

• Processo FAPESP: 19/06045-2 - Síntese e caracterização físico-química de um biopolímero de mantas de nanofibras (Cotton wool-like) de óxido de grafeno
• Beneficiário: Rafael Francisco Lia Mondelli
• Modalidade de apoio: Auxílio à Pesquisa - Regular