Structure and plasmon coupling of gold-poly(N-isopropylacrylamide) core–shell microgel arrays with thermally controlled interparticle gap

Clara-Rahola, Joaquim; Contreras‐Cáceres, Rafael; Sierra‐Martin, Benjamin; Maldonado-Valdivia, Ana; Hund, Markus; Fery, Andreas; Hellweg, Thomas; Fernández-Barbero, A.

doi:10.1016/j.colsurfa.2014.09.029

Cited by 23 publications

(21 citation statements)

References 37 publications

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“…Intrigued by this resemblance, we wonder if the dynamics from currency exchange markets and the one from colloids exhibit a more significant symmetry and if ultimately can be described by equivalent physical laws. Note that colloidal dynamics is driven by parameters such as interparticle interactions, density, or applied shear [35][36][37][38], whereas market dynamics is determined by parameters of a very different nature, such as the trading volume, number of investors at a given period, or balance between supply and demand [39][40][41].…”

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confidence: 99%

Diffusive and Arrestedlike Dynamics in Currency Exchange Markets

et al. 2017

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This work studies the symmetry between colloidal dynamics and the dynamics of the Euro-U.S. dollar currency exchange market (EURUSD). We consider the EURUSD price in the time range between 2001 and 2015, where we find significant qualitative symmetry between fluctuation distributions from this market and the ones belonging to colloidal particles in supercooled or arrested states. In particular, we find that models used for arrested physical systems are suitable for describing the EURUSD fluctuation distributions. Whereas the corresponding mean-squared price displacement (MSPD) to the EURUSD is diffusive for all years, when focusing in selected time frames within a day, we find a two-step MSPD when the New York Stock Exchange market closes, comparable to the dynamics in supercooled systems. This is corroborated by looking at the price correlation functions and non-Gaussian parameters and can be described by the theoretical model. We discuss the origin and implications of this analogy.

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confidence: 99%

Diffusive and Arrestedlike Dynamics in Currency Exchange Markets

et al. 2017

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“…In addition to this, the stimuli responsive character of hydrogel shells represents another dimension to tailor assembly properties dynamically. The benefit of the responsiveness to influence particle assemblies was only recently addressed . Another option to trigger transitions and consequently alter materials properties is photothermal actuation which can be applied to gold‐hydrogel core–shell particles, for example .…”

Section: Discussionmentioning

confidence: 99%

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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“…The development of strategies for the preparation of surfaces decorated with noble metal nanoparticle (MNP) assemblies has received significant attention in the last years, while their use in the most outstanding biological, catalytic, and optoelectronic applications is being anticipated. Indeed, to obtain surface arrays of MNPs different protocols have been reported, including lithography‐based, spin‐coating, connective deposition,[2b] surface‐initiated transfer radical polymerization (SI‐ATRP) combined with click chemistry, miniemulsion loaded with a metal precursor complex, self‐assembly at liquid–liquid interface, Langmuir–Blodgett, evaporation of gold by electron‐beam, and drop casting . Many of these methods present some disadvantages due partly to their complexity, and the less complex methods show poor control of outcome.…”

Section: Introductionmentioning

confidence: 99%

“…This feature can be exploited for the generation of 2D and 3D nanoparticle arrays. [1–3,6,8a,9] In this case, the polymer shell is used to control the gap between the particles, avoiding direct contact among metallic cores and, in addition, guiding the self‐assemble. Furthermore, the hydrophobic p(NIPAM) coating can trap hydrophobic analytes close to the Au NPs surface, amplifying the Raman signal, and making them attractive materials for sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Design of Nanostructured Surfaces Based on Metal NP Precipitation Strategy and their Catalytic Application

Guarrotxena

Garrido

Quijada‐Garrido

2018

Adv Materials Inter

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the MNP arrangement in an organized manner will prevent possible agglomerations, often observed in MNPs with the subsequent loss of functional properties. In this regard, the reversible temperature-induced coil-globule transition in water experienced by thermoresponsive polymers, such as poly(N-isopropylacrylamide) p(NIPAM), causes the polymer shrink above the lower critical solution temperature (LCST). This feature can be exploited for the generation of 2D and 3D nanoparticle arrays. [1-3,6,8a,9] In this case, the polymer shell is used to control the gap between the particles, avoiding direct contact among metallic cores and, in addition, guiding the self-assemble. Furthermore, the hydrophobic p(NIPAM) coating can trap hydrophobic analytes close to the Au NPs surface, amplifying the Raman signal, [3] and making them attractive materials for sensing applications. In this work, we investigate the MNPs coating with poly(2-(2-methoxyethoxy)ethyl methacrylate) p(MEO 2 MA), a thermoresponsive polymer, based on lateral chains of oligoethylene glycol, which exhibits a LCST around 26 °C. We demonstrate that setting the temperature close to the collapsing temperature of the thermoresponsive polymers, based on MEO 2 MA and a thiolated comonomer, is a simple strategy to attain the controlled precipitation of MNPs on a microstructured polymer surface (Scheme 1) consisting on well-aligned electrospun fibers of a biodegradable polymer with high plasmonic specific area.The arrangement of plasmonic NPs may find application for sensing, [10] and, the aligned metal NP-fiber, as scaffolds, for neural cells; since fibers coated with gold NPs can guide the neurite outgrowth. [7b] Nevertheless, another interesting property of noble metal NPs is their catalytic activity. Indeed, despite the widespread use of colloidal noble metal NPs in catalysis, [11] the extraordinary catalytic activity of pristine MNPs is often hampered due to their tendency to aggregate during the catalytic reaction, reducing their activity and preventing their reutilization. For this reason, to avoid the aggregation of the particles during catalysis and facilitate their recovery and reutilization, the use of coatings [11b,c,12] and supports [13] are strategies frequently used. Taken this into consideration, we propose a noble metal@polymer@fiber nanocomposite with the MNPs just on the surface of microfiber mats to take advantage of the mats' high surface area and their feasibility to be used for several cycles. In this work, the reduction of 4-nitrophenol in water with gold@polymer@fiber nanocomposite has been studied The fabrication of functional surfaces based on arrangements of metallic nanoparticles (MNPs) is challenging for biomedical, optoelectronic, and catalytic applications. Herein, the fabrication of 3D nanostructured microfibers is reported by the controlled cooperative precipitation of MNPs on electrospun polymer fiber mats, at the critical solution temperature of a thermoresponsive copolymer coating the MNPs surface. To obtain the metallic decorat...

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Structure and plasmon coupling of gold-poly(N-isopropylacrylamide) core–shell microgel arrays with thermally controlled interparticle gap

Cited by 23 publications

References 37 publications

Diffusive and Arrestedlike Dynamics in Currency Exchange Markets

Diffusive and Arrestedlike Dynamics in Currency Exchange Markets

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

Design of Nanostructured Surfaces Based on Metal NP Precipitation Strategy and their Catalytic Application

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