Thermally Sensitive Microgels: From Basic Science to Applications

Cheng, He; Zhang, Guangzhao

doi:10.1002/9783527646425.ch1

Cited by 6 publications

(23 citation statements)

References 117 publications

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“…PNIPAAm microgels, as the first thermosensitive microgels synthesized in 1986, have been a topic of research in a number of studies [64]. The importance, versatility in properties, vast potential, and applications of stimuli-sensitive microgels are documented in details in relatively recent review article [65].…”

Section: Systems Pnipaam-based Microgels/textilesmentioning

confidence: 98%

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

Jovančić

Petruš̆̌̌̌ić

Molina

2014

Handbook of Smart Textiles

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The research focus is lately directed towards the development of the thermosensitive textiles with advanced functionalities. As sources of inspiration for a progress in the field of these innovative materials, stimuli-sensitive polymer engineering, plasma surface engineering, and nanotechnology have been extensively explored. In this work, the polymerization methods for synthesis of Poly(N-isopropylacrylamide), PNIPAAm-based hydrogels, incorporating natural biopolymers (chitosan and b-cyclodextrin), for achieving dual temperature/pH sensitivity and improvement of relevant loading capacity towards specific guest molecules are outlined. These PNIPAAm-based hydrogels are of great interest for biomedical applications (transdermal drug delivery, cell encapsulation, wound dressing, tissue repair, etc.) and intelligent stimuli-sensitive textile coatings for moisture regain control, antimicrobial properties, water and/or oil repellency, and fragrance release. The strategies for synthesis of PNIPAAm-based hydrogels (macro and micro forms) and their proper integration onto textiles through the plasma surface modification, graft polymerization, and coatings are discussed. Novel possibilities for creating hydrogels based on atmospheric plasma polymerization of NIPAAm monomers in liquids have alos been reported. Plasma polymerization in liquids demonstrated a great technological potential given that it may be performed without the use of chemical initiators and even without cross-linking agents, offering multiple advantages over the conventional hydrothermal polymerization methods. Further research on adequate chemical and physical structures of PNIPAAm-based hydrogels and methods of their applications in textiles could boost a progress in the domain of smart textiles, implying novel performances and end uses.

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Section: Systems Pnipaam-based Microgels/textilesmentioning

confidence: 98%

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

Jovančić

Petruš̆̌̌̌ić

Molina

2014

Handbook of Smart Textiles

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“…Hydrogels are example of microgels defined as viscoelastic systems classified to be certain intermediates between polymer chains, viz coils, and the so-called macrogels, such as gelatine or yoghurt [8,9]. They are often chemically prepared to be designated as two-component systems.…”

Section: Introductionmentioning

confidence: 99%

“…They are often chemically prepared to be designated as two-component systems. They consist of mixed solute and solvent phases in which solvent molecules interact with solute particles composed of polymer chains, and their aggregates, prone to behave in a networklike manner, but with a prevailing number of microcrystalline domains included inside their structure [7,8]. By virtue of their complicated intimate interaction map they suffer difficulties in view of reaching a thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

A Tribute to Marian Smoluchowski's Legacy on Soft Grains Assembly and Hydrogel Formation

Gadomski¹,

Kruszewska²,

Bełdowski³

et al. 2018

Acta Phys. Pol. B

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The paper compares the statistical description of physical-metallurgical processes and ceramic-polycrystalline evolutions, termed the normal grain growth (NGG), as adopted to soft-and chemically-reactive grains, with a Smoluchowski's population-constant kernel cluster-cluster aggregation (CCA) model, concerning irreversible chemical reaction kinetics. The former aiming at comprehending, in a semi-quantitative way, the volumeconservative (pressure-drifted) grain-growth process which we propose to adopt for hydrogel systems at quite low temperature (near a gel point). It has been noticed, that by identifying the mean cluster size < k > from the Smoluchowski CCA description with the mean cluster radius' size RD, from the NGG approach of proximate grains, one is able to embark on equivalence of both frameworks, but only under certain conditions. For great enough, close-packed clusters, the equivalence can be obtained by rearranging the time domain with rescaled time variable, where the scaling function originates from the dispersive (long-tail, or fractal) kinetics, with a single exponent equal to d+1 (in d-dimensional (Euclidean) space). This can be of interest for experimenters, working in the field of thermoresponsive gels formation, where crystalline structural predispositions overwhelm.

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“…Microgels are defined as viscoelastic systems classified as intermediates between polymer chains, viz coils, and the so-called macrogels, such as gelatine or yoghurt [1,2]. They are often chemically prepared as two-component systems which consist of mixed solute and solvent phases.…”

Section: Introductionmentioning

confidence: 99%

“…They are often chemically prepared as two-component systems which consist of mixed solute and solvent phases. The solvent molecules interact with solute particles composed of polymer chains, and their aggregates, incline to behave similar to network-like structures [1]. Their complicated interaction map causes difficulty in achieving a thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent volume expansion of microgel in nonequilibria

2018

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We propose to adopt a non-isothermal and colloid type cluster-cluster aggregation stochastic model aimed at comprehending the temperature driven and polymer swelling accompanying volume expansion encountered in microgels. The nonequilibrium nature of the process is captured by describing expansion characteristics with simplified power laws, indicating the scalability of properties with time and temperature. Additionally, molecular dynamics simulations of the presented mechanism for a chosen biopolymer have been performed. This can be of interest for experimenters working in the field of nonequilibrium phase transitions, and fairly prospectively, within the area of thermal phonon-involving technology. In these areas, scanning the system's temperature, or sometimes tuning similar dissipation-addressing physical factors, such as pH, appears to be a fairly pivotal examination case.

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Thermally Sensitive Microgels: From Basic Science to Applications

Cited by 6 publications

References 117 publications

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

Novel Synthesis Pathways for PNIPAAm-Based Hydrogels and Their Application in Thermosensitive Textiles

A Tribute to Marian Smoluchowski's Legacy on Soft Grains Assembly and Hydrogel Formation

Temperature dependent volume expansion of microgel in nonequilibria

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