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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of Different Surface-Charged Lamellar Materials on Swelling Properties of Nanocomposite Hydrogels

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Pfeifer, Marcela [1] ; Andrade, Flavio A. C. [2, 1] ; Bortoletto-Santos, Ricardo [2, 3] ; Aouada, Fauze A. [4] ; Ribeiro, Caue [2]
Total Authors: 5
[1] Univ Fed Sao Carlos, Rodovia Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[2] Embrapa Instrumentacao, Lab Nacl Nanotecnol Agronegocio LNNA, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil
[3] Univ Estadual Paulista Julio de Mesquita Filho UN, Inst Quim, Ave Prof Francisco Degni 55, BR-14800900 Araraquara, SP - Brazil
[4] Univ Estadual Paulista Julio de Mesquita Filho UN, Ave Brasil 56, BR-15385000 Centro, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 29, n. 10, p. 3311-3323, OCT 2021.
Web of Science Citations: 0

This study investigated the effect of different surface-charged lamellar materials on the swelling and diffusion properties of synthesized polyacrylamide-methylcellulose hydrogels (HG). Montmorillonite and thermally activated hydrotalcite (300 degrees C and 550 degrees C) were incorporated during the preparation of nanocomposite (NC) hydrogels. A series of NC hydrogels were prepared by varying the lamellar material content (1:1, 2:1 and 4:1). The results showed that the HG with hydrotalcite (550 degrees C) was strongly dependent on the ionic intensity, and that the swelling degree increased by 50%, 65% and 78% with reducing the hydrotalcite content at (1:1), (2:1) and (4:1), respectively. The water absorption capacity of HG containing montmorillonite or hydrotalcite (300 oC) was slightly affected when the pH was decreased from 7 to 3. However, the pH variation from 7 to 10 increased the water absorption capacity of most HG, except those containing hydrotalcite (550 degrees C) at (2:1) and (4:1). The presence of lamellar nanoparticles in hydrogels made the polymer matrix more rigid, and less likely to absorb water. In contrast, HG with hydrotalcite (550 degrees C) at (2:1) and (4:1) showed anomalous behavior with an increase in their water absorption capacity. The results support that the developed NC-HG can be suitable candidate materials for controlled released applications. (AU)

FAPESP's process: 19/18036-8 - Development of nanocomposite coatings based on polyurethane modified with exholled argilominerals for application in the control of slow release of soluble fertilizers
Grantee:Marcela Pfeifer
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/10636-8 - From the cell factory to the Biodiesel-Bioethanol integrated biorefinery: a systems approach applied to complex problems in micro and macroscales
Grantee:Roberto de Campos Giordano
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 20/03259-9 - Development of a new kind of biodegradable polymer nanocomposes for application as coating in the slow and controlled release of soluble fertilizers
Grantee:Ricardo Bortoletto Santos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 13/03643-0 - Study of novel biodegradable carrier vehicles of fertilizers and agricultural defensives based on hydrogel and nanostructure silicates as an alternative in the combat of environmental impacts
Grantee:Fauze Ahmad Aouada
Support type: Regular Research Grants