Hidrogéis À Base De Poliacrilamida E Quitosana Com Potencial Aplicabilidade No Controle De Conformidade Em Reservatórios De Petróleo

Mendes, Matheus de Souza Lima; Aguiar, Kelly Lúcia Nazareth Pinho de; Pereira, Kaique Alves Brayner; Oliveira, Priscila Cardim de; Mansur, Cláudia R. E.

doi:10.22407/1984-5693.2019.v11.p.01-15

Cited by 2 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, in higher concentrations (1.5% to 3.5%), the solutions showed different rheological properties, acting as non-Newtonian fluids. Similarly, Mendes et al (2019) produced hydrogels based on polyacrylamide and chitosan for oil sealing in pipelines and observed flow curves similar to those found in this study.…”

Section: Gqa1 Gqa2 Gqa3supporting

confidence: 82%

Chitosan and Aloe vera gel formulations as wound healing agents in episiotomy

Macêdo

Dantas

Souza

et al. 2021

RSD

View full text Add to dashboard Cite

Episiotomy is an obstetric technique that consists of making an incision in the perineum during vaginal childbirth, to facilitate the baby to pass through. After delivery, the perineal region is sutured with absorbable threads to heal the cut. However, are frequent reports of pain, infections, and dyspareunia after the execution of this technique. In this context, the use of biomaterials becomes relevant as they promote faster and safer tissue repair, making it an attractive alternative for the healing process of episiotomy. Based on the physical-chemical and biological properties of chitosan and Aloe vera, this research developed three different vaginal gels, with the purpose of promoting tissue regeneration and infection prevention post-episiotomy. Chitosan solutions with concentrations of 5% w/v were prepared by dissolving the chitosan powder in 2% v/v aqueous solution of acetic acid. After the extraction and processing of the mucilage, the pulp of the Aloe vera leaf was added to the chitosan gel in the proportions of 1, 2, and 3% v/v. All formulations were neutralized by the slow drip technique of a neutralizing solution of sodium hydroxide (2 M). The compositions were analyzed according to their organoleptic aspect, optical microscopy, spreadability, hydrogen potential, absorption spectroscopy, cytotoxicity, and rheological behavior. Based on the results obtained, it was possible to conclude that gels produced have the potential to be used as vaginal gels.

show abstract

Section: Gqa1 Gqa2 Gqa3supporting

confidence: 82%

Chitosan and Aloe vera gel formulations as wound healing agents in episiotomy

Macêdo

Dantas

Souza

et al. 2021

RSD

View full text Add to dashboard Cite

show abstract

Synthesis of polyacrylamide copolymers cross-linked by chitosan hydrogels with potential application for conformance control of petroleum reservoirs

2022

View full text Add to dashboard Cite

Conformance control treatment of oil reservoirs is one of the techniques that can bring improvements in both sweep efficiency and reduction of excessive co-production of oily water. In this work, the chemical treatment of conformance control was studied through the development of gelling systems for in situ hydrogel formation to act as blocking agents in the more permeable regions. For this purpose, copolymers based on acrylamide were used, containing the co-monomers of acrylic acid (AA), partially hydrolyzed polyacrylamide (PHPA), or 2-acrylamide-methylpropane-sulfonic acid (AMPS), as well as the terpolymer containing these three types of co-monomers (AA, PHPA, and AMPS), and chitosan as a cross-linking agent. The systems were preliminarily evaluated using Sydansk gel strength codes, which classify the behavior of hydrogels using codes from “A” to “J” according to their fluidity. In these tests, scans of polymer and cross-linker concentration were performed, the formation of hydrogels was verified, and mechanistic proposals were considered. Subsequently, the viscoelastic properties of the materials were evaluated, followed by an experimental design consisting of a central composite experimental design (CCD), where the variables, temperature and aging time of the hydrogels, showed statistical relevance directly to the gel strength. The systems had optimal injection viscosity values and low tan(delta) values, demonstrating a desirable gel strength to act as blocking agents, and a critical stability time of 15 days. Graphical Abstract Supplementary Information The online version contains supplementary material available at 10.1007/s13726-022-01132-x.

show abstract

Hidrogéis À Base De Poliacrilamida E Quitosana Com Potencial Aplicabilidade No Controle De Conformidade Em Reservatórios De Petróleo

Cited by 2 publications

References 5 publications

Chitosan and Aloe vera gel formulations as wound healing agents in episiotomy

Chitosan and Aloe vera gel formulations as wound healing agents in episiotomy

Synthesis of polyacrylamide copolymers cross-linked by chitosan hydrogels with potential application for conformance control of petroleum reservoirs

Contact Info

Product

Resources

About