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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.)

Analyzing the Effects of Silica Nanospheres on the Sol-Gel Transition Profile of Thermosensitive Hydrogels

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Author(s):
Ribeiro, Lucas S. [1] ; Sala, Renata L. [1] ; de Jesus, Leticia A. O. [1] ; Cruz, Sandra A. [1] ; Camargo, Emerson R. [1]
Total Authors: 5
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Langmuir; v. 37, n. 24, p. 7373-7379, JUN 22 2021.
Web of Science Citations: 0
Abstract

The insertion of nanoparticles into smart hydrogels can diversify their functionalities by a synergistic combination of the components properties within the hydrogels. While these hybrid systems are attractive to the biomaterials field, careful design and control of their properties are required since the new interactions between the polymer and the nanoparticles can result in changes or the loss of hydrogels stimuli response. In order to understand the physicochemical aspects of the thermoresponsive systems, nanocomposites of poly(N-vinylcaprolactam) (PNVCL) and silica nanoparticles with different sizes and concentrations were synthesized. The UV-vis and DLS techniques showed that the PNVCL has a sharp phase transition at 34 degrees C, while the nanocomposites have a diffuse transition. The nanocomposites showed an initial coil- globule transition before the phase transition takes place. This was identified by the evolution of the hydrodynamic diameter of the nanocomposite globules before the cloud point temperature (T-cp), which remained constant for PNVCL. This new transition profile can be described by two stages in which microscopic volume transitions occur first, followed by the macroscopic transition that forms the hydrogel. These results show that the proposed nanocomposites can be designed to have tunable stimuli response to smaller temperature variations with the formation of intermediate globule states. (AU)

FAPESP's process: 13/25663-2 - Development of Polymeric Nanocomposites Applicable to Tissue Engineering
Grantee:Renata Lang Sala
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 18/12871-0 - Modification of the temperature transition profile of thermosensitive nanocomposites
Grantee:Lucas da Silva Ribeiro
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 14/09014-7 - STUDY OF THE POTENTIAL OF NANO-HETEROSTRUCTURE OF COPPER AND NIOBIUM OXIDE FOR USE IN ARTIFICIAL PHOTOSYNTHESIS
Grantee:André Esteves Nogueira
Support Opportunities: Scholarships in Brazil - Post-Doctorate