Poly(N-isopropylacrylamide)–Au hybrid microgels: synthesis, characterization, thermally tunable optical and catalytic properties

Shi, Shuxian; Zhang, Long; Wang, Tao; Wang, Qianman; Gao, Yu; Wang, Na

doi:10.1039/c3sm52303a

Cited by 46 publications

(45 citation statements)

References 22 publications

(30 reference statements)

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“…Das et al [18] fabricated well-dispersed AgNPs onto the surface of nanosilica for cost-effective and eco-friendly water purification. AuNPs of about 3.8 nm were incorporated into thiol-functionalized poly(N-isopropylacrylamide) microgels and exhibited well-defined thermally modulated optical and catalytic properties, as reported by Shi et al [19] Even though the problem of aggregation of metal nanoparticles can be efficiently avoided, the isolation and recovery of heterogeneous catalysts always involve traditional filtration and high-speed centrifugation, which are difficult and costly. Thus, it is highly desirable to employ appropriate support materials and to develop highly efficient recycling methods for catalysts.…”

Section: Introductionmentioning

confidence: 88%

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

Wang

Zhai

et al. 2015

Eur J Inorg Chem

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Noble-metal-derived functional materials have played indispensable roles in the reduction of dye under aqueous conditions; however, their cost and separation are great limitations on their wider practical applications. Therefore, an alternative preparation of comparable materials with low cost and good ease of separation is required. Herein magnetic microspheres (i.e., Fe 3 O 4 /Cu) were synthesized through a green single-step solvothermal method for the first time with ethylene glycol serving as reductant and reaction media. The prepared materials were characterized by means of powder Xray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometry, a vibrating sample mag-

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Section: Introductionmentioning

confidence: 88%

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

Wang

Zhai

et al. 2015

Eur J Inorg Chem

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“…Conventionally, to control the catalytic activity of MNPs, MNPs are covered by PNIPAM-based hydrogel or are dispersed into PNIPAM-based hydrogel [28,36,53]. In this case, the accessibility of MNPs for chemical moieties in solution could be controlled by the obvious change in the porosity of PNIPAM-based networks due to the remarkable change in the conformation of PNIPAM segments in the microgel when crossing the LCST.…”

Section: Tunable Catalytic Activity For 4-np and Nbmentioning

confidence: 99%

“…easily controlled. Additionally, introduction of stimuliresponsive polymer segments into the microgel support can endow the supported catalysts with stimuli-responsive catalytic activity [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic polymer-Ag composite microgels with tunable catalytic activity and selectivity

et al. 2015

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Environmentally sensitive polymer microgels are increasingly being used to enhance the catalytic activity of supported metal nanoparticles. Herein, we synthesized composite polymer microgels composed of the core-shell structure poly(styrene-N-isopropylacrylamide)/poly(Nisopropylacrylamide-co-methacrylic acid) (P(St-NIPAM)/ P(NIPAM-co-MAA)). Ag nanoparticles (AgNPs) were loaded onto/into the network chains of the polymer microgels through a facile method. The prepared composite microgels were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. The catalytic selectivity of P(St-NIPAM)/P(NIPAM-co-MAA)-Ag composite microgels for the reduction of hydrophilic 4-nitrophenol (4-NP) and hydrophobic nitrobenzene (NB) by NaBH 4 was investigated. The results indicated that the introduction of PMAA segments into the microgel networks caused the poly(N-isopropylacrylamide) (PNIPAM) chains to separate into a shell layer and prevented the aggregation of AgNPs. The separated PNIPAM segments not only favor the mass transfer, but also possess thermosensitive function to modulate the catalytic activity of AgNPs. These structural features of the prepared composite microgels could enhance the selectivity and mass transfer of the reactants for catalytic reduction of 4-NP and NB through temperature modulation.

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“…Therefore, hybrid microgel-based catalysts do not lose their catalytic activity and can be reused. Shi et al (2013) used Au-p(NIPAM-co-AET) hybrid microgels as catalyst for the reduction of 4-NP in aqueous medium. They studied the effect of temperature on the value of apparent rate constant (k app ) of reduction.…”

Section: Catalysismentioning

confidence: 99%

“…For example, Shi et al (2013) synthesized p(NIPAM-coAAc) microgels and then they coupled carboxyl groups of AAc with 2-aminoethane thiol (AET) via 1-ethyl-3-[3-(dimethylamino)-propyl] carbodiimide hydrochloride. Coupling-modified microgels possess thiol at the tip of pendant group of AAc units.…”

Section: Synthesis Of Microgelsmentioning

confidence: 99%

Review on synthesis, properties, characterization, and applications of responsive microgels fabricated with gold nanostructures

Farooqi

Khan

Begum

et al. 2016

Reviews in Chemical Engineering

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AbstractIn this article, the classification, synthesis, properties, and applications of responsive microgels fabricated with gold (Au) nanostructures have been systematically reviewed. Microspheres, core-shell, core-shell-shell, hollow rings, and yolk-shell are different types of hybrid microgels containing Au nanostructures that have been reported in the literature. Hybrid microgels have tunable properties of both Au nanomaterial and smart polymeric material. Due to this unique combination, hybrid microgels containing Au nanomaterial are potential candidates for applications in drug delivery, photothermal therapy, glucose sensing, insulin delivery, catalysis, photonics, and ultrasensitive analyte analysis. Recent research progress in the design, characterization, and applications of Au nanomaterial containing smart polymer microgels has been described here. Many gaps in the literature and future perspectives of Au nanomaterial-based hybrid microgels have been highlighted in this review, which will be helpful for the people working in this area to plan their future work.

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Poly(N-isopropylacrylamide)–Au hybrid microgels: synthesis, characterization, thermally tunable optical and catalytic properties

Cited by 46 publications

References 22 publications

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

Amphiphilic polymer-Ag composite microgels with tunable catalytic activity and selectivity

Review on synthesis, properties, characterization, and applications of responsive microgels fabricated with gold nanostructures

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Poly(N-isopropylacrylamide)–Au hybrid microgels: synthesis, characterization, thermally tunable optical and catalytic properties

Cited by 46 publications

References 22 publications

One‐Step Green Synthesis of Multifunctional Fe3O4/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

One‐Step Green Synthesis of Multifunctional Fe3O4/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

Amphiphilic polymer-Ag composite microgels with tunable catalytic activity and selectivity

Review on synthesis, properties, characterization, and applications of responsive microgels fabricated with gold nanostructures

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Product

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About

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes

One‐Step Green Synthesis of Multifunctional Fe₃O₄/Cu Nanocomposites toward Efficient Reduction of Organic Dyes