Equilibrium swelling of thermo-responsive copolymer microgels

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1039/d0ra08619c

Cited by 7 publications

(7 citation statements)

References 84 publications

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“…60 Copyright 2020, American Chemical Society contraction of hydrogel also exemplifies hydrophobicity when heated. 177 Grunlan et al suggested a double network (DN) PNIPAAm hydrogel system to enhance thermosensitivity compared to a single network (SN) hydrogel without increasing the VPTT. 66 DN hydrogels were also prepared as micropillar arrays to increase cell-release efficiency when the temperature underwent VPTT (Figure 13(E)).…”

Section: Thermal Actuationmentioning

confidence: 99%

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

Park

Won

Cho

et al. 2021

Journal of Polymer Science

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The functional surface features of living creatures are driven by the complex morphology of periodically arranged micro/nanoscale structures. Various fabrication processes have been devised mimic the performance of natural features; these methods morph hierarchical and multi-leveled pillar arrays, such as top-down, bottom-up, and a hybrid of top-down and bottom-up processes.Different methodologies are employed depending on the materials, such as polymeric composites, metal oxides, metals, and carbon nanotubes. In this review, we discuss the shape-reconfiguration of stimuli-responsive micro/ nanopillar arrays achieved by capillary force, light, magnetic field, and heat. In particular, photo-and magnetic actuation of pillar arrays revealed programmability according to the arrangement of the liquid crystal molecules or magnetic particles by remote control. Furthermore, applications of micro/nanopillar arrays, such as adhesives, omniphobicity, optics, and biomedical technologies, are also discussed.

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Section: Thermal Actuationmentioning

confidence: 99%

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

Park

Won

Cho

et al. 2021

Journal of Polymer Science

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“…[171] Drozdov et al demonstrated the versatility of this production method by comparing PNIPAmbased microgels co-polymerized with tert-butylacrylamide (tBA), AA, hydroxyethylmethacrylate (HEMA), triethyleneglycol methacrylate (TREGMA), acrylamide, and N,N'-dimethylacrylamide. [22] The team showed that the chemical composition governs the size and swelling ratio of the resultant microparticles, resulting in microgels with the hydrodynamic diameter ranging from tens of nm to >1 µm and swelling ratios up to 5-fold. The simplicity and scalability of this process, together with its innate pairing with thermo-responsive monomers, makes precipitation polymerization one of the most popular procedures for microgel synthesis.…”

Section: Precipitation Polymerizationmentioning

confidence: 99%

“…Microgels are fabricated in a wide range of sizes, spanning across tens of nanometers to tens of micrometers, depending upon the chemical composition and molar ratio of the monomers, and the synthetic method. [22][23][24] The swelling ratio, defined as the relative weight fraction of water within the microparticle, [25] can also be adjusted either during preparation, [26][27][28] or in real-time by leveraging environmentally-responsive monomers and additives. [29][30][31][32][33] Reversible swelling behavior is arguably the most often exploited feature of microgel coatings, as it provides a means to control both morphological and physicochemical properties of the coated surface.…”

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confidence: 99%

Surface‐Bound Microgels for Separation, Sensing, and Biomedical Applications

Cutright

Harris

Ramesh

et al. 2021

Adv Funct Materials

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This study presents a comprehensive survey of microgel-coated materials and their functional behavior, describing the complex interplay between the physicochemical and mechanical properties of the microgels and the chemical and morphological features of substrates. The cited literature is articulated in four main sections: i) properties of 2D and 3D substrates, ii) synthesis, modification, and characterization of the microgels, iii) deposition techniques and surface patterning, and iv) application of microgel-coated surfaces focusing on separations, sensing, and biomedical applications. Each section discussesby way of principles and examples -how the various design parameters work in concert to deliver functionality to the composite systems. The case studies presented herein are viewed through a multi-scale lens. At the molecular level, the surface chemistry and the monomer make-up of the microgels endow responsiveness to environmental and artificial physical and chemical cues. At the micro-scale, the response effects shifts in size, mechanical, and optical properties, and affinity towards species in the surrounding liquid medium, ranging from small molecules to cells. These phenomena culminate at the macro-scale in measurable, reversible, and reproducible effects, aiming in a myriad of directions, from lab-scale to industrial applications.

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“…The hydrodynamic radius R h of the microgel particles was measured by dynamic light scattering in the interval of temperatures between 25 and 55 °C. The equilibrium degree of swelling

Q ((), T)

is determined using the equation 63

\frac{1 + Q ((), T)}{1 + Q ((), T_{*})} goodbreak= {[\frac{R_{h} ((), T)}{R_{h} ((), T_{*})}]}^{3}

with

T_{*} = 25 ° normalC

and

Q ((), T_{*}) = 3

.…”

Section: Fitting Of Experimental Datamentioning

confidence: 99%

A model for equilibrium swelling of the upper critical solution temperature type thermoresponsive hydrogels

Drozdov

Christiansen

2021

Polymer International

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Thermoresponsive gels of the upper critical solution temperature (UCST) type shrink below their critical temperature and swell above it. Changes in water uptake by these gels are driven by thermally induced dissociation of hydrogen or ionic bonds between chains. A simple model is developed for the description of the equilibrium swelling of thermophilic gels with hydrogen bonds. To confirm its ability to describe observations, equilibrium swelling diagrams are fitted on poly(acrylamide‐acrylic acid) and poly(acrylamide‐acrylonitrile) macroscopic gels and microgels with various structures (copolymer gels, gels with interpenetrating networks, nanocomposite gels), as well as on biocompatible poly(N‐acryloyl‐glycinamide) and poly(allylurea‐co‐allylamine) gels. Numerical simulation reveals that material parameters evolve consistently with molar fractions of crosslinker, hydrophobic and hydrophilic comonomers in the feed, degree of ionization of functional groups, and concentration of nanofiller. It is shown that the model can also be applied to describe observations on thermophilic zwitterionic gels. © 2021 Society of Industrial Chemistry.

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Equilibrium swelling of thermo-responsive copolymer microgels

Abstract: A model is developed for equilibrium swelling of thermo-responsive copolymer gels and is applied to predict the effect of molar fraction of comonomers on the volume phase transition temperature of macroscopic gels and microgels.

Cited by 7 publications

References 84 publications

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

Fabrication and applications of stimuli‐responsive micro/nanopillar arrays

Surface‐Bound Microgels for Separation, Sensing, and Biomedical Applications

A model for equilibrium swelling of the upper critical solution temperature type thermoresponsive hydrogels

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