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

Yang, Lian-Qin; Hao, Ming; Wang, Hongyu; Zhang, Ying

doi:10.1007/s00396-015-3642-4

Cited by 33 publications

(13 citation statements)

References 55 publications

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“…In the FT-IR spectra of P(St-NIPAM)/P(MAA- co -NIPAM), the peaks at 698 and 757 cm −1 were assigned to the C–H out-of-plane wagging vibration of singly substituted aromatic rings, indicating that styrene was present in the prepared materials. The peaks at 1649 and 1547 cm −1 were assigned to the C=O stretch of the PNIPAM amide (I) and (II) groups, whereas 1709 cm –1 was attributed to the asymmetrical stretching vibration of the C=O group in MAA [43]. In addition, the peaks at 3309 and 3440 cm −1 were attributed to the N–H stretching vibration of the PNIPAM and the stretching vibration absorption of hydroxyl function groups.…”

Section: Resultsmentioning

confidence: 99%

“…Core-shell-structured P(St-NIPAM)/P(NIPAM- co -MAA) polymer microgels were synthesized in two steps, namely soap-free emulsion polymerization and seeded emulsion polymerization [43]. Using the P(St-NIPAM)/P(NIPAM- co -MAA) composite microgels as templates, amorphous TiO 2 was prepared through the hydrolysis and condensation of TBOT by ammonium ions in a mixture of absolute ethanol and acetonitrile [46].…”

Section: Methodsmentioning

confidence: 99%

“…The results revealed that the catalytic activities of metal-polymer composite particles can be adjusted in a nonlinear fashion by varying the temperature. Our group synthesized AgNPs loaded onto/into the network chains of the poly(styrene- N -isopropylacrylamide)/poly( N -isopropylacrylamide- co -methacrylic acid) (P(St-NIPAM)/P(NIPAM- co -MAA)) polymer microgels by a facile method [43]. The introduction of non-thermosensitive PMAA chains into the network was expected to limit the volume change of the shell caused by the PNIPAM chains at the LCST, thereby achieving favorable mass transfer.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Silver Nanoparticles Loaded onto Polymer-Inorganic Composite Materials and Their Regulated Catalytic Activity

et al. 2019

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We present a novel approach for the preparation of polymer-TiO2 composite microgels. These microgels were prepared by the in situ hydrolysis and condensation of titanium tetrabutoxide (TBOT) in a mixed ethanol/acetonitrile solvent system, using poly(styrene-co-N-isopropylacrylamide)/poly(N-isopropylacrylamide-co-methacrylic acid) (P(St-NIPAM/P(NIPAM-co-MAA)) as the core component. Silver nanoparticles (AgNPs) were controllably loaded onto the polymer-TiO2 composite microgels through the reduction of an ammoniacal silver solution in ethanol catalyzed by NaOH. The results showed that the P(St-NIPAM)/P(NIPAM-co-MAA)-TiO2 (polymer-TiO2) organic-inorganic composite microgels were less thermally sensitive than the polymer gels themselves, owing to rigid O–Ti–O chains introduced into the three-dimensional framework of the polymer microgels. The sizes of the AgNPs and their loading amount were controlled by adjusting the initial concentration of [Ag(NH3)2]+. The surface plasmon resonance (SPR) band of the P(St-NIPAM)/P(NIPAM-co-MAA)-TiO2/Ag (polymer-TiO2/Ag) composite microgels can be tuned by changing the temperature of the environment. The catalytic activities of the polymer-TiO2/Ag composite microgels were investigated in the NaBH4 reduction of 4-nitrophenol. It was demonstrated that the organic-inorganic network chains of the polymer microgels not only favor the mass transfer of the reactant but can also modulate the catalytic activities of the AgNPs by tuning the temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Silver Nanoparticles Loaded onto Polymer-Inorganic Composite Materials and Their Regulated Catalytic Activity

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“…Another way to achieve stronger persistence of the nanoparticles in the microgel network is the use of carboxylic acid groups. Based on this idea, Yang et al have prepared coreshell microgels with carboxylic acid groups in the shell [103]. The microgel particles have thus a p(styrene-co-NIPAM) @ p(NIPAM-co-methacrylic acid) structure and are made in a two-step synthesis.…”

Section: Applications Of Core-shell Microgels In Catalysismentioning

confidence: 99%

“…High resolution TEM (a) and STEM (b) image of the particles prepared by Yang et al The STEM-EDS image nicely reveals the distribution of the silver nanoparticles in the hybrid core-shell microgels. Reproduced with permission by Springer Nature from Ref [103]…”

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Recent advances in stimuli-responsive core-shell microgel particles: synthesis, characterisation, and applications

Oberdisse

Hellweg

2020

Colloid Polym Sci

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Inspired by the path followed by Matthias Ballauff over the past 20 years, the development of thermosensitive core-shell microgel structures is reviewed. Different chemical structures, from hard nanoparticle cores to double stimuli-responsive microgels have been devised and successfully implemented by many different groups. Some of the rich variety of these systems is presented, as well as some recent progress in structural analysis of such microstructures by small-angle scattering of neutrons or X-rays, including modelling approaches. In the last part, again following early work by the group of Matthias Ballauff, applications with particular emphasis on incorporation of catalytic nanoparticles inside core-shell structures-stabilising the nanoparticles and granting external control over activity-will be discussed, as well as core-shell microgels at interfaces.

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Core‐shell microgel stabilized silver nanoparticles for catalytic reduction of aryl nitro compounds

Naseem

Begum

Farooqi

et al. 2020

Applied Organom Chemis

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Silver nanoparticles loaded into shell of poly (styrene‐N‐isopropylmethacrylamide‐co‐acrylic acid) core shell [P (SNA‐CS)] gel particles were synthesized and analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis) and dynamic light scattering (DLS). Catalytic activity of Ag@P (SNA‐CS) particles was investigated by reducing p‐nitroaniline (p‐NA) into p‐aminoaniline (p‐AA) in the presence of sodium borohydride (NaBH4) reductant. Molecules of the substrate adsorbed on the surface of silver nanoparticles interact with borohydride ions (BH4−) to form p‐AA. Other nitroarenes like o‐nitroaniline (o‐NA), p‐nitrophenol (p‐NP) o‐nitrophenol (o‐NP), 2,4‐dinitrophenol(2,4‐DNP) were also reduced into their corresponding aryl amines using Ag@P (SNA‐CS) composite microgels as catalyst. Reported catalyst efficiently reduced the nitro aromatic compounds individually as well as simultaneously at ambient temperature. Effect of different reaction conditions (catalyst dose, concentration of NaBH4 and concentration of p‐NA) on reaction completion time, value of apparent rate constant (kapp) and reduction efficiency of the catalyst for reduction of p‐NA was also demonstrated. Ag@P (SNA‐CS) catalyst was found to be able to retain activity up to four cycles.

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

Cited by 33 publications

References 55 publications

Synthesis of Silver Nanoparticles Loaded onto Polymer-Inorganic Composite Materials and Their Regulated Catalytic Activity

Synthesis of Silver Nanoparticles Loaded onto Polymer-Inorganic Composite Materials and Their Regulated Catalytic Activity

Recent advances in stimuli-responsive core-shell microgel particles: synthesis, characterisation, and applications

Core‐shell microgel stabilized silver nanoparticles for catalytic reduction of aryl nitro compounds

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