Using time-resolved pump-probe spectroscopy, we have performed the first investigation of the vibrational modes of gold nanoshells. The fundamental isotropic mode launched by a femtosecond pump pulse manifests itself in a pronounced time-domain modulation of the differential transmission probed at the frequency of nanoshell surface plasmon resonance. The modulation amplitude is significantly st...

The main objective of this research was to synthesize and characterize gold-coated Fe3O4 /SiO2 nanoshells for clinical applications. Magnetite nanoparticles (NPs) were prepared via co-precipitation. The results showed that smaller particles can be synthesized by decreasing the NaOH concentration, which in our case this corresponded to 35 nm by using 0.9 M of NaOH at 750 rpm. The NPs were then m...

In this research, the effect of rotation on the free vibration is investigated for the size-dependent cylindrical functionally graded (FG) nanoshell by means of the modified couple stress theory (MCST). MCST is applied to make the design and the analysis of nano actuators and nano sensors more reliable. Here the equations of motion and boundary conditions are derived using minimum potential ene...

Remotely controlled, localized drug delivery is highly desirable for potentially minimizing the systemic toxicity induced by the administration of typically hydrophobic chemotherapy drugs by conventional means. Nanoparticle-based drug delivery systems provide a highly promising approach for localized drug delivery, and are an emerging field of interest in cancer treatment. Here, we demonstrate ...

Metal nanoshells and nanotubes with dielectric cores are useful structures to change the surface plasmon frequencies in wide range. Here, our localized theory derived random phase approximation at high frequency condition is applied investigate excitations for metal cores, which embedded dielectrics. Assuming that local functions metals dielectrics have step function shapes interfaces quasi-sta...

Abstract We describe a simple method for the preparation of gold-decorated silica (SiO 2 ) nanoparticles (NPs) by in situ precipitation using BH 4 − ions reduction as procedure, where are adsorbed onto PEI-functionalized SiO NPs stabilizing and reducing gold PEI-SiO surface water under ambient conditions. The result was 3-nm nanoshell attached to core (~ 75 nm) with plasmon resonance (SPR) at ~...