Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Karg, Matthias

doi:10.1002/macp.201500334

Cited by 31 publications

(29 citation statements)

References 109 publications

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“…[ 12,28–30 ] Therefore, we use core–shell particles with rigid cores (silica) and soft, deformable polymer shells. [ 31,32 ] The particles self‐assemble into hexagonally ordered monolayers at the air/water interface, where the polymer shell provides a flexible spacer to separate the inorganic core particles. [ 33 ] Our method opens the possibility of tuning the lattice constant independent of the core particle diameter.…”

Section: Figurementioning

confidence: 99%

Chiral Surface Lattice Resonances

et al. 2020

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resonances. [5,6] A collective excitation (SLR) possesses a reduced linewidth as compared to the excitation of the LSPRs in nanoparticle ensembles. [1][2][3][4] Thus, SLRs can provide high quality-factor metasurfaces with substantial impact in nanophotonic and sensing applications. [1][2][3][4] Oblique incidence on planar metasurfaces constructed of an array of split-ring resonators showed that SLRs can also selectively respond to the handedness of circularly polarized light, causing sharp lattice-mode assisted extrinsic circular dichroism. [7,8] The spectral position of these SLRs can be tuned by the angle of incidence, leading to the emergence of extrinsic chiral surface lattice resonances. [9][10][11][12] Strong optical activity can also result from plasmonic 3D nanostructures without mirror symmetry. However, SLRs from arrays of 3D building-blocks with intrinsic chirality remain unexplored, but promise decreased losses and enhanced optical activity. [1,13] The fabrication of chiral 3D nanostructures is challenging for both, bottom-up and top-down methods. [14][15][16] Recently, the excitation of SLRs was seen in self-assembled, large area colloidal systems. [17,18] Such systems offer the possibility for fast manufacturing and covering large-areas on different substrate materials. [19] Colloid-based materials allow for embedding of nanoparticle arrays into flexible free-standing polymer films, [20] enabling the design of mechanically tunable [21] and stimuliresponsive hydrogel membranes. [22] Here, we use colloidal lithography [23][24][25] to fabricate arrays of 3D crescents with a selective response to the handedness of incident circularly polarized light, and we experimentally demonstrate handedness-dependent (chiral) SLRs at normal incidence. Colloidal lithography [23][24][25] is an experimentally simple and fast process to fabricate 3D chiral plasmonic nanostructures. [26][27][28] However, a necessary condition to observe SLRs in such nanostructure arrays is that their lattice constant must be in the range of the wavelength of the LSPRs of the individual nanostructures. [1][2][3][4] For objects with resonances in the near-infrared, such as, for example, split ring resonators, this requires large interparticle distances approaching the micrometer range. For conventional colloidal lithography processes, which depend on the controlled shrinkage of a polymer particle matrix, such distances are not easily achievable. [12,[28][29][30] Therefore, we use core-shell particles with rigid cores (silica) and soft, deformable polymer shells. [31,32] The particles selfassemble into hexagonally ordered monolayers at the air/water Collective excitation of periodic arrays of metallic nanoparticles by coupling localized surface plasmon resonances to grazing diffraction orders leads to surface lattice resonances with narrow line width. These resonances may find numerous applications in optical sensing and information processing. Here, a new degree of freedom of surface lattice resonances is experimentally investigated by dem...

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Section: Figurementioning

confidence: 99%

Chiral Surface Lattice Resonances

et al. 2020

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“…The beauty of these materials is its smart behavior; that is, we can tune the properties of metal nanoparticles by changing the properties of polymer network with external stimuli before or during the process of reduction, e.g., temperature [22][23][24], pH [25][26][27], ionic strength [28,29]. In current years, many investigators have a great interest in the field of stimulus-responsive composite systems composed of continuous organic and dispersed inorganic phase [30] for different applications, e.g., drug delivery [31][32][33], sensors [34,35], electrical [36], catalysis [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

Shah

Sayed

Fayaz

et al. 2017

Nanotechnol. Environ. Eng.

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In this work, we report the synthesis of composite system pNAC, composed of silver nanoparticles embedded in pure thermo-sensitive crosslinked polymer network of poly(N-isopropylacrylamide-co-acrylamide) (pNA), using as a catalyst for the reduction of methylene blue (MB) dye by sodium borohydride (NaBH 4 ). The pNA was prepared by conventional free radical polymerization technique using sodium dodecyl sulfate as stabilizing agent, followed by in situ reduction of AgNO 3 inside the polymer network by NaBH 4 for the synthesis of composite systems pNACs. The synthesized pNA and pNACs were characterized by FTIR, dynamic light scattering, thermogravimetric analysis, scanning electron microscopy and UV-visible spectroscopy techniques. The materials were found sensitive toward temperature change of the medium. The entrapment ability of pNA toward different amounts of AgNO 3 solution was studied, and effect of metal content on particle size of pNACs was analyzed. The pNACs were applied as a catalyst for the reduction of MB in which they exhibit high catalytic activity and reusability toward the reaction.

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“…To achieve this requirement the hybrid nanogels must be specifically designed. A very wide variety of architectures result by their decoration, modification, and functionalization, [93], or they can be modified by conjugation with both organic [94] and inorganic [95] types of nanoparticles and nanostructures. The morphologies of hybrid nanogels vary both with the particle type and the assembly technique, each component being either core or shell, of different size and architecture [96].…”

Section: Stealth Functionalizationmentioning

confidence: 99%

New Developments in Medical Applications of Hybrid Hydrogels Containing Natural Polymers

Vasile¹,

Pamfil²,

Stoleru³

et al. 2020

Molecules

195

131

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New trends in biomedical applications of the hybrid polymeric hydrogels, obtained by combining natural polymers with synthetic ones, have been reviewed. Homopolysaccharides, heteropolysaccharides, as well as polypeptides, proteins and nucleic acids, are presented from the point of view of their ability to form hydrogels with synthetic polymers, the preparation procedures for polymeric organic hybrid hydrogels, general physico-chemical properties and main biomedical applications (i.e., tissue engineering, wound dressing, drug delivery, etc.).

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Functional Materials Design through Hydrogel Encapsulation of Inorganic Nanoparticles: Recent Developments and Challenges

Cited by 31 publications

References 109 publications

Chiral Surface Lattice Resonances

Chiral Surface Lattice Resonances

Ag-loaded thermo-sensitive composite microgels for enhanced catalytic reduction of methylene blue

New Developments in Medical Applications of Hybrid Hydrogels Containing Natural Polymers

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