Polymer microcapsules loaded with Ag nanocatalyst as active microreactors

Horecha, Marta; Kaul, Elisabeth; Horechyy, Andriy; Stamm, Manfred

doi:10.1039/c4ta00606b

Cited by 42 publications

(34 citation statements)

References 53 publications

(51 reference statements)

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“…9 In recent years, a new class of carrier systems is emerging that can be termed active nanoreactors. [10][11][12][13][14][15][16][17] Here the nanoparticles are embedded in a polymer gel that reacts to external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Theory of Solvation-Controlled Reactions in Stimuli-Responsive Nanoreactors

et al. 2015

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Metallic nanoparticles embedded in stimuli-responsive polymers can be regarded as nanoreactors since their catalytic activity can be changed within wide limits: the physicochemical properties of the polymer network can be tuned and switched by external parameters, e.g. temperature or pH, and thus allows a selective control of reactant mobility and concentration close to the reaction site. Based on a combination of Debye's model of diffusion through an energy landscape and a two-state model for the polymer, here we develop an analytical expression for the observed reaction rate constant k obs . Our formula shows an exponential dependence of this rate on the solvation free enthalpy change∆G sol , a quantity which describes the partitioning of the reactant in the network versus bulk. Thus, changes in∆G sol , and not in the diffusion coefficient, will be the decisive factor affecting the reaction rate in most cases. A comparison with recent experimental data on switchable, thermosensitive nanoreactors demonstrates the general validity of the concept.

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Section: Introductionmentioning

confidence: 99%

Theory of Solvation-Controlled Reactions in Stimuli-Responsive Nanoreactors

et al. 2015

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“…15 Nitro compounds are water soluble aromatic pollutants which can hardly be biodegraded or self-cleaned by the environment. 3,[17][18][19][20][21][22][23] The catalytic reduction of water soluble aromatic pollutants by heterogeneous catalysts has many advantages like easy operation, clean processing, high efficiency, low cost, etc. 16 Recently, much attention has been paid to the catalytic reduction of nitro compounds via metal-based catalysts in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

A multifunctional statistical copolymer vesicle for water remediation

Xiao

2016

Polym. Chem.

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Multifunctional statistical copolymers can be simply synthesized in one step without tedious and timeconsuming procedures. In addition, the fuzzy boundary between different functional groups in the statistical copolymers can facilitate the fabrication of new functional nanomaterials. Herein, we designed a novel multifunctional vesicle based on a statistical copolymer, poly[[2-hydroxy-3-(naphthalen-1-ylamino) propyl methacrylate]-stat-[2-(diethylamino)ethyl methacrylate]] [P(HNA 21 -stat-DEA 35 )] which can be synthesized by reversible addition-fragmentation transfer (RAFT) polymerization in one step. The HNA moiety is designed for capturing polycyclic aromatic hydrocarbons (PAHs) by π-π stacking, while the DEA moiety is engineered to immobilize gold nanoparticles for facilitating the reduction of 4-nitrophenol (4-NP) in aqueous solution. This vesicle showed excellent ability in water remediation by absorbing PAHs and accelerating the reduction of 4-nitrophenol (4-NP). Overall, this multifunctional statistical copolymer vesicle provides a new insight for designing multifunctional water remediation materials. † Electronic supplementary information (ESI) available: Synthesis, and characterization. See

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“…4,5 Unfortunately, AgNPs tend to easily aggregate and change shape during catalytic reactions because of their high surface energy resulting from the high surface-to-volume ratio, and result in a remarkable reduction in their catalytic activity and selectivity undesirably. 9,[13][14][15][16] Polymer， especially renewable and nonhazardous biopolymer matrix as a support for metal nanocatalysts have attracted considerable attention. A classic method is immobilization or encapsulation of AgNPs on/into supporting matrix.…”

Section: Introductionmentioning

confidence: 99%

Alginate fibers embedded with silver nanoparticles as efficient catalysts for reduction of 4-nitrophenol

Zhao

et al. 2015

RSC Adv.

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Silver nanoparticles (AgNPs) have attracted much attention as promising catalysts in various electron transfer reactions due to their high catalytic efficiency. However, their poor stability results in the decrease of the catalytic efficiency and the poor cycling performance, which have hindered the practical application of AgNPs. In this work, alginate fibers embedded with AgNPs were prepared via in situ reduction of Ag + -alginate fibers in the presence of glucose. Field emission scanning electron microscopy (FE-SEM) and Transmission electron microscopy (TEM) indicated that spherical AgNPs dispersed on the surface and the interior of the fibers. The alginate fibers could enable AgNPs to be highly stabilized and thus led to the excellent reusability as heterogeneous catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in aqueous media. The catalytic results indicated that 4-NP could be reduced completely within 15 min. Moreover, the catalyst was easily recovered and reused for at least ten cycles in the reduction reactions, confirming its excellent stability. Most importantly, compared to the conventional powdery catalysts, the fiber catalyst could be handled much more conveniently for re-usage owing to its easily separation.

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Polymer microcapsules loaded with Ag nanocatalyst as active microreactors

Cited by 42 publications

References 53 publications

Theory of Solvation-Controlled Reactions in Stimuli-Responsive Nanoreactors

Theory of Solvation-Controlled Reactions in Stimuli-Responsive Nanoreactors

A multifunctional statistical copolymer vesicle for water remediation

Alginate fibers embedded with silver nanoparticles as efficient catalysts for reduction of 4-nitrophenol

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