2019
DOI: 10.1155/2019/3765614
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Temperature Driven Transformation in Dextran-Graft-PNIPAM/Embedded Silver Nanoparticle Hybrid System

Abstract: During the last decade, stimuli-responsible polymers based on poly(N-isopropylacrylamide) having conformational transition in the range of physiological temperature have been discussed as novel drug delivery nanosystems. A star-like copolymer with a dextran core and grafted poly(N-isopropylacrylamide) arms (D-g-PNIPAM) was synthesized, characterized, and used as a matrix for silver sol preparation. The comparative study of the behavior of individual D-g-PNIPAM and the nanohybrid system D-g-PNIPAM/silver nanopa… Show more

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Cited by 6 publications
(8 citation statements)
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“…Correspondingly, the concentration of the single Ag NPs decreases, while the concentration of the aggregated ones increases. Let us note that the phenomenon of the temperature-induced aggregation of D-g-PNIPAM/AgNPs macromolecules was observed in our recent work [12]. We revealed in [12] that the direct heating at the temperatures higher than the LCST point does not change the size of D-g-PNIPAM/AgNPs aggregates.…”
Section: Physical Mechanisms Of Laser-induced Structural Transformatisupporting
confidence: 55%
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“…Correspondingly, the concentration of the single Ag NPs decreases, while the concentration of the aggregated ones increases. Let us note that the phenomenon of the temperature-induced aggregation of D-g-PNIPAM/AgNPs macromolecules was observed in our recent work [12]. We revealed in [12] that the direct heating at the temperatures higher than the LCST point does not change the size of D-g-PNIPAM/AgNPs aggregates.…”
Section: Physical Mechanisms Of Laser-induced Structural Transformatisupporting
confidence: 55%
“…The transformation of the extinction spectra of D-g-PNIPAM/AuNPs at a backward decrease in the laser intensity keeps its trend that proves the fact that the laser-induced formation of aggregates of D-g-PNIPAM/AuNPs macromolecules is irreversible. Thus, the present work together with our recent work [30] will show the irreversible character of laser-induced transformations (aggregation) in the Dg-PNIPAM/Ag(Au) NPs hybrids that differ from the temperature-induced transformations which usually are reversible [11][12][13]. Such difference has been rationalized to be a result of the action of attractive optical forces between the Ag NPs that promote the formation of aggregates and counteract their destruction.…”
Section: Introductionmentioning
confidence: 55%
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