Ag Nanoparticle/Polydopamine-Coated Inverse Opals as Highly Efficient Catalytic Membranes

Choi, Gwan Hyun; Rhee, Do Kyung; Park, A. Reum; Oh, Min Jun; Hong, Sunghwan; Richardson, Joseph J.; Guo, Junling; Caruso, Frank; Yoo, Pil J.

doi:10.1021/acsami.5b11021

Cited by 68 publications

(41 citation statements)

References 42 publications

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“…Already today nanoscopically structured materials play a crucial role in applications such as sensors or lab on chip devices, [ 4 ] separation, [ 4d ] catalysis, [ 5 ] and for the developing of new materials, for example for applications in tissue engineering [ 6 ] or for the control of surface wettability. [ 7 ] Traditionally, nanostructures are fabricated using top‐down approaches like photolithography, ink‐jet printing or electrospinning.…”

Section: Introductionmentioning

confidence: 99%

Wetting‐Controlled Localized Placement of Surface Functionalities within Nanopores

Ochs

Mohammadi²,

Vogel³

et al. 2020

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Mimicking such functional control in synthetic nanopores requires precise control of structure and local placement of surface functionality. Such precisely prepared materials with nanoscale control on structure and functionalization would allow, for example, new perspectives in sensing. [1] Further strategies mimicking the functionality of biological channels include dynamic curvature nanochannel-based membranes to regulate ionic transport [2] or flexible elastomer-based microchannels for microfluidic devices. [3] Already today nanoscopically structured materials play a crucial role in applications such as sensors or lab on chip devices, [4] separation, [4d] catalysis, [5] and for the developing of new materials, for example for applications in tissue engineering [6] or for the control of surface wettability. [7] Traditionally, nanostructures are fabricated using top-down approaches like photolithography, ink-jet printing or electrospinning. Alternatively, bottom-up methods, which are based on the self-assembly of molecules or larger building blocks, can yield defined structures with high resolution. [8] Periodic, nanostructured materials are for example accessible through the self-assembly of colloidal building blocks, which can yield macroscopic areas of wellordered colloidal crystals. [9] Such colloidal crystals can be further used as templates to generate inorganic, interconnected nanopore arrays by backfilling with a sol-gel precursor and subsequent removal of the templating particles. [9a,10] In two dimensions, the resulting porous materials are known as inverse colloidal monolayers and their wettability can be adjusted by pore opening angle and surface functionalization. [7e,11] Such structures are ideal model pores due to their uniformity, adjustable pore size and ordered structure.A key step toward multifunctional nanopores with nanolocal control, is the ability to precisely position different functionalities into individual pores. [1a] Therefore, it is necessary to develop strategies for a nanoscale control in manufacturing and functionalization of porous materials. This enables nanopore design with multiple functional and responsive units, individually and precisely placed into each nanopore. [1b] To date, functionalization of porous silica materials is mainly based on postsynthetic functionalization strategies like grafting of silanes from gas or liquid phase or cocondensation of functional building blocks. [12] These approaches generally result in a homogenous functionalization without In the context of sensing and transport control, nanopores play an essential role. Designing multifunctional nanopores and placing multiple surface functionalities with nanoscale precision remains challenging. Interface effects together with a combination of different materials are used to obtain local multifunctionalization of nanoscale pores within a model pore system prepared by colloidal templating. Silica inverse colloidal monolayers are first functionalized with a gold layer to create a hybrid porous ...

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Section: Introductionmentioning

confidence: 99%

Wetting‐Controlled Localized Placement of Surface Functionalities within Nanopores

Ochs

Mohammadi²,

Vogel³

et al. 2020

Small

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“…However, to date, the aggregation of NPs remains the main bottleneck hindering the real application of Ag NPs due to the accompanying changes in their chemical and physical properties. The immobilization of NPs onto the appropriate supporting matrices for exploring application has been considered as the promising solution and hitherto the great challenge, which improves the performance and facilitates the application of NPs . It should be noted that the optimization of supporting materials and the fabrication process need to be elaborated since the activity and stability of nanoparticles is influenced by the nature of the supports used for their immobilization.…”

Section: Introductionmentioning

confidence: 99%

A Readily Accessible Functional Nanofibrous Membrane for High‐Capacity Immobilization of Ag Nanoparticles and Ultrafast Catalysis Application

Liu

Cheng

Kong

et al. 2018

Adv Materials Inter

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IntroductionAs one of the most prevalent noble metal materials, Ag nanoparticles (NPs) possess unique distinct heterogeneous catalytic Constructing macroscopic materials with optimal surface structure to immobilize silver nanoparticles polluted in water environment and further maximize their practical functionality still remains a great challenge. An infrequent strategy is developed to build a flexible material system combining PVA-co-PE nanofiber membrane (NFM) scaffold and mussel-inspired polydopamine (PDA), which provides a formidable surface interacting with polyethyleneimine (PEI). The resultant PEI/PDA/NFM presents an ultrahigh adsorption capacity (727.8 mg g −1 ) to citrate-capped silver nanoparticles much higher than the values reported in the literatures. The broad applicability of the multifunctional composite membranes in water treatment is further demonstrated. Interestingly, a promising concurrent performance of antibacterial, antifouling, and catalysis is acquired in bacterial filtrations. Benefiting from the structure, a plasma process further enhances the catalytic performance of AgNPs-PEI/PDA/NFM with an ultrahigh turnover frequency value: 6.65 × 10 −1 mol mol −1 min −1 , which facilitates the fast degradation treatment of p-nitrophenol (p-NP) in continuous-flow filtration. The excellent properties can be rationally assigned to the optimized surface structure synergistically determined by the high specific area of porous nanofiber scaffold and high substrate adaptability of reactive polydopamine. This implies the superiority of membranes obtained by present strategy in recycling Ag NPs contaminant and further applies it in fast-efficient wastewater treatment applications.

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“…These include Suzukic ouplings and catalytic transferh ydrogenation (CTH) reactions. Although the Suzuki chemistry is well described in terms of reactionc onditions, scope, and limitations, [15,16] in the CTH field the reports follow ac lear pattern:t he assembled metal/PDA (or PDAbased) material containing Au, [17][18][19][20][21][22][23][24][25][26] Ag, [26][27][28] Pd, [29,30] or Pt/Au [31] as metal component is mostly used in as ingle transformation involving 4-nitrophenol, 100-2000 equivalent of NaBH 4…”

Section: Introductionmentioning

confidence: 99%

Palladium on Polydopamine: Its True Potential in Catalytic Transfer Hydrogenations and Heck Coupling Reactions

et al. 2017

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The application of Pd–polydopamine and magnetic Fe3O4@Pd–polydopamine catalysts in catalytic transfer hydrogenation reactions and the Heck arylation is reported. The reduction of a wide range of aromatic nitro‐compounds bearing both electron‐donating and ‐withdrawing substituents to the corresponding anilines could be efficiently performed, although the reduction of carbonyl compounds was found to be less general. In the latter case, only aromatic ketones could be reduced to the corresponding alcohols, whereas aldehyde substrates were unaffected, which may be owing to their reaction with the catalyst support leading to catalyst deactivation. By using magnetic Fe3O4@Pd–polydopamine system, facilitated catalyst recovery and reuse for five consecutive cycles without considerable loss of activity in nitro‐group reduction. The efficiency of the catalyst in Heck reactions was comparable to that in transfer hydrogenation, however, no catalytic activity was observed upon reuse in this case, likely as a result of metal leaching. We also explored tandem Heck reaction/catalytic transfer hydrogenation sequences, however, the two reactions showed limited compatibility under the applied conditions.

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Ag Nanoparticle/Polydopamine-Coated Inverse Opals as Highly Efficient Catalytic Membranes

Cited by 68 publications

References 42 publications

Wetting‐Controlled Localized Placement of Surface Functionalities within Nanopores

Wetting‐Controlled Localized Placement of Surface Functionalities within Nanopores

A Readily Accessible Functional Nanofibrous Membrane for High‐Capacity Immobilization of Ag Nanoparticles and Ultrafast Catalysis Application

Palladium on Polydopamine: Its True Potential in Catalytic Transfer Hydrogenations and Heck Coupling Reactions

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