Seeded precipitation polymerization for the synthesis of gold-hydrogel core-shell particles: the role of surface functionalization and seed concentration

Rauh, Astrid; Honold, Tobias; Karg, Matthias

doi:10.1007/s00396-015-3782-6

Cited by 45 publications

(58 citation statements)

References 41 publications

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“…Ideal colloids that can meet this requirement are core/shell particles that consist of a plasmonic nanoparticle core and soft polymer shells with large thicknesses. Thick polymer shells can be realized by seeded precipitation polymerization yielding hydrogel encapsulated nanoparticles with high colloidal stability . This route allows varying the shell thickness over a broad range, up to several hundreds of nanometers.…”

Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

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Noble metal nanoparticles can absorb incident light very efficiently due to their ability to support localized surface plasmon resonances (LSPRs), collective oscillations of the free electron cloud. LSPRs lead to strong, nanoscale confinement of electromagnetic energy which facilitates applications in many fields including sensing, photonics, or catalysis. In these applications, damping of the LSPR caused by inter‐ and intraband transitions is a limiting factor due to the associated energy losses and line broadening. The losses and broad linewidth can be mitigated by arranging the particles into periodic lattices. Recent advances in particle synthesis, (self‐)assembly, and fabrication techniques allow for the realization of collective coupling effects building on various particle sizes, geometries, and compositions. Beyond assemblies on static substrates, by assembling or printing on mechanically deformable surfaces a modulation of the lattice periodicity is possible. This enables significant alteration and tuning of the optical properties. This progress report focuses on this novel approach for tunable spectroscopic properties with a particular focus on low‐cost and large‐area fabrication techniques for functional plasmonic lattices. The report concludes with a discussion of the perspectives for expanding the mechanotunable colloidal concept to responsive structures and flexible devices.

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Section: Plasmonic Lattices Via Colloidal Assemblymentioning

confidence: 99%

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

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“…In addition to that, we resolve the effect of an explicit coupling zone (co) connecting these two components. These coupling zones may be intentionally fabricated [44,45] or they may arise during the manufacturing process if the matrix material on the inclusion surfaces behaves differently from the bulk of the matrix [2,22,23].…”

Section: Macroscopic Variablesmentioning

confidence: 99%

Hydrodynamic description of elastic or viscoelastic composite materials: Relative strains as macroscopic variables

Menzel

2016

Phys. Rev. E

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One possibility to adjust material properties to a specific need is to embed units of one substance into a matrix of another substance. Even materials that are readily tunable during operation can be generated in this way. In (visco)elastic substances, both the matrix material as well as the inclusions and/or their immediate environment can be dynamically deformed. If the typical dynamic response time of the inclusions and their surroundings approach the macroscopic response time, their deformation processes need to be included into a dynamic macroscopic characterization. Along these lines, we present a hydrodynamic description of (visco)elastic composite materials. For this purpose, additional strain variables reflect the state of the inclusions and their immediate environment. These additional strain variables in general are not set by a coarse-grained macroscopic displacement field. Apart from that, during our derivation, we also include the macroscopic variables of relative translations and relative rotations that were previously introduced in different contexts. As a central point, our approach reveals and classifies the importance of a new macroscopic variable: relative strains. We analyze two simplified minimal example geometries as an illustration.

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“…This approach is well suited for the encapsulation of inorganic nanoparticles giving access to core–shell particles with single nanoparticle cores. The general mechanism of this encapsulation by seeded precipitation polymerization is schematically depicted in Figure . The crude reaction mixture contains the molecularly dissolved monomers and the inorganic nanoparticles (1).…”

Section: Colloidal Library: Core–shell Particles With Hydrogel Shellsmentioning

confidence: 99%

Section: Colloidal Library: Core–shell Particles With Hydrogel Shellsmentioning

confidence: 99%

“…By this technique, nanoparticles with spherical, decahedral, and star‐like shape were encapsulated in PNIPAM by subsequent precipitation polymerizations. Only very recently, Rauh et al have shown that only the hydrophobicity of the nanoparticle seeds determines the successful hydrogel encapsulation through seeded precipitation polymerization . Figure shows representative transmission electron microscopy (TEM) images of the reaction products obtained with gold nanoparticle seeds with different surface functionalities.…”

Section: Colloidal Library: Core–shell Particles With Hydrogel Shellsmentioning

confidence: 99%

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

Karg

2015

Macro Chemistry & Physics

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The encapsulation of inorganic nanoparticles by hydrogel shells offers a promising pathway toward the design of functional building blocks for manifold applications. Hydrogel shells can be grown in a broad range of thicknesses, from a few tens to several hundreds of nanometer, allowing for encapsulation of inorganic particles with different composition, size, and shape. This gives access to a diverse toolbox of colloidal building blocks, which combine properties of the individual components in a multifunctional fashion. Hydrogel shells provide the nanoparticle cores with transparent, soft, and responsive coatings which improve the colloidal stability and allow interparticle distance control in colloidal assembly. The variation of the shell dimensions gives access to controlling the fill factor and ultimately distance‐dependent effects such as plasmon resonance coupling. This article summarizes the latest efforts in the preparation of core–shell colloids with different inorganic cores and hydrogel shells of various morphologies as well as the assembly of these building blocks into functional superstructures. It is demonstrated how the level of complexity can be increased from 1D to 3D by chemical treatment of core–shell particles, i.e., core growth or core removal, and template‐free as well as template‐assisted assembly leading to isotropic and anisotropic arrangements of particles.

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Seeded precipitation polymerization for the synthesis of gold-hydrogel core-shell particles: the role of surface functionalization and seed concentration

Cited by 45 publications

References 41 publications

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Hydrodynamic description of elastic or viscoelastic composite materials: Relative strains as macroscopic variables

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

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