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Modulation of viscoelastic properties of physical gels by nanoparticle doping: influence of the nanoparticle capping agent.

Materials in the nanometer regime are of great contemporary interest because of their numerous properties and the various applications envisaged for them.[1] In real-life or high-end applications, these materials are often mixed with other systems to yield new composites that have superior properties compared to those of the constituents. For example, novel composites engineered from polymers and carbon nanotubes (CNTs) offer the promise of plastics with enhanced thermal, electronic, and mechanical properties.[2] Similarly, there are reports of studies on nanoparticles (NPs) embedded in polymers and polymeric gels.[3a] These mixtures exhibit interesting optoelectronic properties, such as temperaturedependent reversible UV/Vis spectral changes, as a result of the controlled and reversible aggregation of the NPs in polymer–NP and dendrimer–NP ensembles.[3b–d] The electron– phonon dynamics of NPs entrapped in polymeric gels have also been studied. Compared to NPs in the solution phase, NPs in such confined media display quite different behavior.[3e] Thus, the design and investigation of these materials is highly important and of significant technological relevance.