A Translucent Nanocomposite with Liquid Inclusions of a Responsive Nanoparticle Dispersion

Abstract

Active nanocomposites are created with liquid inclusions that contain plasmonic gold nanoparticles inside a polymeric matrix. The alkylthiol-coated gold particles are designed to reversible agglomerate at certain temperatures, which changes the plasmonic coupling and thus optical properties. It is found that particles confined to the liquid inclusions inside the active composite retain this capability and cause macroscopic, temperature-dependent color change of the solid. The transition is fully reversible for at least 100 times and tunable in temperature via particle size and ligand. This method is suitable to "package" responsive dispersion in solid composites to exploit their dynamic properties in materials.

Magnetically Addressable Shape‐Memory and Stiffening in a Composite Elastomer

“…The composite relaxes back to its original form in less than 1 s when the magnetic field is released, as shown in Figure c and in the Movie S1 available in the Supporting Information. The combination of various types of liquid inclusions with soft elastomeric matrices has been recently proposed as an effective way to create soft materials with novel functionalities, such as high electrical conductivity and temperature dependent color . We have extended this approach to our material, using instead a magneto‐rheological fluid.…”

“…The combination of various types of liquid inclusions with soft elastomeric matrices has been recently proposed as an effective way to create soft materials with novel functionalities, such as high electrical conductivity and temperature dependent color. [16][17][18][19] We have extended this approach to our material, using instead a magneto-rheological fluid. This has a number of advantages compared to previously reported composites in which the magnetic particles are directly dispersed in the polymer matrix.…”

Reversible magnetism switching of iron oxide nanoparticle dispersions by controlled agglomeration

“…Such shis have been reported for noble metal and semiconductor nanoparticles before. 2,23 Agglomeration was not fully reversed at the highest investigated temperatures of 40 C, where approximately 20% of particles remained agglomerated; this partial irreversibility was most probably caused by larger or insufficiently functionalized nanoparticles. Complete reversibility was achieved upon using smaller and less polydisperse iron oxide nanoparticles that we prepared as described in previous work.…”

“…1a) and reported in recent work for other non-polar nanoparticles. 23 The maximum of the magnetization amplitude (A max ) of the heating curve is above the one in the cooling curve. We suggest that the magnetization amplitude of Néel-dominated SPIONs is strongly affected by particle-particle interactions (such as dipole-dipole coupling) upon agglomeration that change the magnetic relaxation with respect to an external alternating magnetic eld.…”

Trendbericht Festkörperchemie

“…Dadurch verschiebt sich die Plasmonenresonanz, was eine sichtbare Farbveränderung hervorruft. 48) Abb. 14. a) Transmissionselektronenmikrograph der Nanopeapodstrukturen von Au@Nb@H x K 1−x NbO 3 .…”