Thermosensitive Core–Shell Particles as Carriers for Ag Nanoparticles: Modulating the Catalytic Activity by a Phase Transition in Networks

Lü, Yan; Yu, Mei; Drechsler, Markus; Ballauff, Matthias

doi:10.1002/anie.200502731

Cited by 715 publications

(576 citation statements)

References 46 publications

(24 reference statements)

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“…43,44,[48][49][50][51] It is important to note that except for our recent report, 21 there was no example available in the literature where Os NPs were used for the catalysis reaction of the organic nitro compounds, so we compared our catalytic efficiency with other noble metals like Au and Ag. 43,44,[48][49][50][51] The anisotropic Au NPs also used as a catalyst for the 4-NA reduction and the rate constant value were found to be 2.083 Â 10 À2 min À1 . 2 In our previous report taking Os NCs in DNA as scaffold, we observed the first order catalytic reaction rate 3.87 Â 10 À2 min À1 for first 6 min and 0.45 min À1 for later 8 min.…”

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

“…22 In the present study we observed that the reaction rate was 0.26 min À1 which was the highest ever reported for Os NPs as a catalyst and much superior to other noble metals like Au or Ag. 2,22,43,44,[48][49][50][51] Apart from 4-NA, we also checked our catalysis reaction with other nitro compounds like 4-NP, 2-NP, 2-NA, etc., and in all cases the expected catalysis reduction taking place and the reaction were completed in different time scales. Table S1 (in the ESI †) shows the different nitro compounds tested and the corresponding time required for the full reduction.…”

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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A new route for the formation of osmium nanoparticles (NPs) having different morphologies like aggregated clusters, chain-like networks, and small spheres are reported. The synthesis was done by utilizing a simple wet-chemical method at room temperature (RT) by the reaction of OsO 4 , cetyl trimethyl ammonium bromide (CTAB), 2,7-dihydroxynaphthalene (2,7-DHN) and NaOH under 30 min of reaction. The diameter of the individual particles in all the morphologies was B1-3 nm. The synthesized materials have been tested for catalysis and SERS studies. The catalysis study was examined taking different organic nitro compounds and the catalysis rate was found superior as compared to other reports. The surface enhanced Raman scattering (SERS) study was done taking Rose Bengal (R Be) as a probe molecule and the observed enhancement factor (EF) value was found superior or comparable to most of other noble metal NPs. The overall synthesis process was simple, less time consuming and cost-effective. The enhanced catalytic and SERS activities of the Os NCs might open up a new avenue for the application in other organic catalysis reactions, SERS based detection of environmentally important trace bio-molecules and sensors.

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Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Section: Catalysis Study On the Reduction Of 4-na Using Os Ncsmentioning

confidence: 99%

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Ede

Nithiyanantham

Kundu

2014

Phys. Chem. Chem. Phys.

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“…1 Particularly, AgNPs exhibit electrochemical, 2 catalytic, 3 antimicrobial 4 and optical 5 properties that make them especially interesting in electronic, catalysis and sensors fields. [6][7][8][9][10] These properties, as in other kind of metal NPs, are related with their sizes and shapes.…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Study of the Surface-Enhanced Raman Scattering Effect of Silver Nanoparticles Generated in Voltammetry Experiments.

et al. 2014

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UV/Vis absorption and Raman spectroelectrochemistry have been used to study silver nanoparticles (AgNPs) electrodeposition, allowing a better understanding about the metal nanoparticles (NPs) formation process and its influence on the surface-enhanced Raman scattering (SERS) effect. These techniques have provided in-situ information related to the synthesis of AgNPs by cyclic voltammetry. Using a marker, such as cyanide anion (CN -), Raman spectroscopy has allowed us to study all changes that take place on a platinum electrode surface 3 during the AgNPs electrodeposition process. Raman spectra show different SERS behavior depending on the NPs generated. UV/Vis absorption spectroelectrochemistry yields information on the changes in AgNPs plasmon band during their electrodeposition while Raman signal is highly correlated with the kind of NPs generated. The methodology used in this work demonstrates that SERS effect depends strongly on nanoparticle size and shape.

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“…Examples realizing these described concepts are based on immobilized enzymes [91][92] or catalytically active metal nanoparticles embedded in microgels. [92][93][94] …”

Section: Microgels For Loading and Release Applicationsmentioning

confidence: 99%

Light-Sensitive Polymeric Nanoparticles Based on Photo-Cleavable Chromophores

Klinger

2013

Springer Theses

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This thesis focuses on the design, synthesis and characterization of novel photo-sensitive microgels and nanoparticles as potential materials for the loading and light-triggered release/accessibility of functional compounds. In order to realize this concept, different approaches to irradiation-dependent response mechanisms have been investigated.Novel light-cleavable divinyl functionalized monomeric crosslinkers based on o-nitrobenzyl derivatives were synthesized and used for the preparation of either PMMA or hydroxyl functionalized PHEMA microgels swellable and degradable in organic solvents. By the introduction of anionic MAA moieties into the PHEMA microgels, this concept was successfully transferred to double stimuli-responsive p(HEMA-co-MAA) hydrogel nanoparticles exhibiting a pH-dependent swelling and light-induced degradation behavior in aqueous media. This sensitivity to two orthogonal triggers is proposed to combine a pHinduced post-formation loading mechanism with a pH-and light-triggered release. In addition, a new class of enzyme-and light-sensitive PAAm microgels based on (meth-)acrylate functionalized dextrans as photo-and enzymatically degradable macromolecular crosslinkers was developed by introducing a photo-labile linker between the enzymatically degradable dextran chain and the polymerizable vinyl moieties. Here, the water solubility of the crosslinkers is assumed to enable an in situ loading approach of hydrophilic compounds.A different approach to the loading of microgels is based on photo-labile covalent microgel-drug conjugates. The first step to the realization of this concept was achieved by the development of a novel functional monomer consisting of a doxorubicin molecule covalently attached to a radically polymerizable methacrylate group via a photo-cleavable linker.Moreover, in order to enable the release of hydrophobic substances in aqueous media, hydrophobic nanoparticles consisting of a photo-resist polymer were designed to be degradable upon irradiation in water. Light-triggered conversion of the initial hydrophobic polymer into hydrophilic PMAA induced in situ particle dissolution and release of nile red.Since the introduction of a stimuli-responsive shell around a microgel is assumed to prevent leakage of embedded compounds, studies on non-stimuli-responsive shell formation around preformed microgel seed particles and the formation of microgel cores in polymeric shells were conducted to investigate potential synthetic pathways to this approach.In a last attempt, the surface of PHEMA and p(HEMA-co-MAA) microgels was functionalized with cinnamoyl groups in order to trigger the (reversible) particles interaction with each other by light-induced [2+2] cycloaddition reactions.

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Thermosensitive Core–Shell Particles as Carriers for Ag Nanoparticles: Modulating the Catalytic Activity by a Phase Transition in Networks

Cited by 715 publications

References 46 publications

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Enhanced catalytic and SERS activities of CTAB stabilized interconnected osmium nanoclusters

Time-Resolved Study of the Surface-Enhanced Raman Scattering Effect of Silver Nanoparticles Generated in Voltammetry Experiments.

Light-Sensitive Polymeric Nanoparticles Based on Photo-Cleavable Chromophores

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