Photoswitchable Catalysis Mediated by Dynamic Aggregation of Nanoparticles

Wei, Yongliang; Han, Sangyoon J.; Kim, Jiwon; Soh, Siowling; Grzybowski, Bartosz A.

doi:10.1021/ja104260n

Cited by 212 publications

(226 citation statements)

References 33 publications

(49 reference statements)

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“…[119] A similar effect was used to develop a photoswitchable catalytic system, where the aggregation induced by change in conformation of azobenzene moieties in the ligands of gold nanoparticles upon UV irradiation effectively stopped hydrosilylation of 4-methoxybenzaldehyde due to lack of access to the surface of the gold NPs. [120] Nonetheless, in many photocatalytic applications, these detrimental effects of clustering are outweighed by the beneficial aspects. NPCs still retain much of the surface area of the constituting NPs, but are much easier to separate from the reaction medium by centrifugation or magnetic force.…”

Section: Progress Reportmentioning

confidence: 99%

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

2016

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The current state of the art in the use of colloidal methods to form nanoparticle assemblies, or clusters (NPCs) is reviewed. The focus is on the two-step approach, which exploits the advantages of bottom-up wet chemical NP synthesis procedures, with subsequent colloidal destabilization to trigger assembly in a controlled manner. Recent successes in the application of functional NPCs with enhanced emergent collective properties for a wide range of applications, including in biomedical detection, surface enhanced Raman scattering (SERS) enhancement, photocatalysis, and light harvesting, are highlighted. The role of the NP-NP interactions in the formation of monodisperse ordered clusters is described and the different assembly processes from a wide range of literature sources are classified according to the nature of the perturbation from the initial equilibrium state (dispersed NPs). Finally, the future for the field and the anticipated role of computational approaches in developing next-generation functional NPCs are briefly discussed.

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Section: Progress Reportmentioning

confidence: 99%

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

2016

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“…The size and the shape of particles typically affect their physical and chemical properties. [6][7][8][9][10][11][12][13][14][15] For example, the catalytic activity of the NPs depends on the particle size 11,12 and the toxicity of gold NPs is known to be size dependent. 6,13,14 The size of sub-micron sized metal oxide particles can determine their photonic properties in water splitting photoelectrodes.…”

Section: Introductionmentioning

confidence: 99%

Growth of Nanoparticles and Microparticles by Controlled Reaction-Diffusion Processes

et al. 2015

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Abstract. Synthesis of different size of nano-and microparticles is important in designing nanostructured materials with various properties. Wet synthesis methods lack flexibility to create various sizes of particles (particle libraries) using fixed conditions without the repetition of the steps of the method with a new set of parameters. Here, we report a synthesis method based on nucleation and particle growth in the wake of a moving chemical front in a gel matrix. The process yields well-separated regions (bands) filled with nearly mono-disperse nano-and microparticles, with the size of particles varying from band to band in a predictable way. The origin of the effect is due to an interplay of a precipitation reaction of the reagents and their diffusion that are controlled in space and time by the moving chemical front. The method represents a new approach and a promising tool for fast and competitive synthesis of various sizes of colloidal particles.

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“…If TMDS was used with (COD)Fe(CO) 3 in THF under UV irradiation, the major products were aldehydes and not alcohols, revealing that the silane source has significant role in determining the reduction pathway. A reversibly switchable hydrosilylation process (that can be turned ON and OFF by stimuli) was reported by Grzybowski and coworkers [102] on the example of the hydrosilylation reaction of 4-methoxybenzaldehyde with diphenylsilane in toluene. As catalyst, photo-switchable gold nanoparticles were used.…”

Section: Light-initiated Hydrosilylation Reactionsmentioning

confidence: 87%

“…A reversibly switchable hydrosilylation process (that can be turned ON and OFF by stimuli) was reported by Grzybowski and coworkers [102] on the example of the hydrosilylation reaction of 4-methoxybenzaldehyde with diphenylsilane in toluene. As catalyst, photo-switchable gold nanoparticles were used.…”

Section: Solvent As a Trigger To Influence The Stereochemical Configumentioning

confidence: 87%

Fifty Years of Hydrosilylation in Polymer Science: A Review of Current Trends of Low-Cost Transition-Metal and Metal-Free Catalysts, Non-Thermally Triggered Hydrosilylation Reactions, and Industrial Applications

2017

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Hydrosilylation reactions, the (commonly) anti-Markovnikov additions of silanes to unsaturated bonds present in compounds such as alkenes and alkynes, offer numerous unique and advantageous properties for the preparation of polymeric materials, such as high yields and stereoselectivity. These reactions require to be catalyzed, for which platinum compounds were used in the initial stages. Celebrating the 50th anniversary of hydrosilylations in polymer science and, concomitantly, five decades of continuously growing research, hydrosilylation reactions have advanced to a level that renders them predestined for transfer into commercial products on the large scale. Facing this potential transfer, this review addresses and discusses selected current trends of the scientific research in the area, namely low-cost transition metal catalysts (focusing on iron, cobalt, and nickel complexes), metal-free catalysts, non-thermally triggered hydrosilylation reactions (highlighting stimuli such as (UV-)light), and (potential) industrial applications (highlighting the catalysts used and products manufactured). This review focuses on the hydrosilylation reactions involving alkene reactants.

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Photoswitchable Catalysis Mediated by Dynamic Aggregation of Nanoparticles

Cited by 212 publications

References 33 publications

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

Nanoparticle Clusters: Assembly and Control Over Internal Order, Current Capabilities, and Future Potential

Growth of Nanoparticles and Microparticles by Controlled Reaction-Diffusion Processes

Fifty Years of Hydrosilylation in Polymer Science: A Review of Current Trends of Low-Cost Transition-Metal and Metal-Free Catalysts, Non-Thermally Triggered Hydrosilylation Reactions, and Industrial Applications

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