4 research outputs found
Immobilization of gold nanoparticles on living cell membranes upon controlled lipid binding
We present a versatile and controlled route to immobilize gold nanoparticles (NPs) on the surface of living cells, while preserving the sensing and optothermal capabilities of the original colloid. Our approach is based on the controlled and selective binding of Au NPs to phospholipids prior to cell incubation. We show that in the presence of the cells the lipid-bound Au NPs are delivered to the cellular membrane and that their diffusion is rather slow and spatially limited, as a result of lipid binding. Avoiding nonspecific membrane labeling, this approach is of general application to several types of colloids and cells and thereby provides a platform for controlled plasmonic and optothermal investigations of living cell membranes.Fil: Ba, Haojin. Ludwig Maximilians Universitat; AlemaniaFil: Rodríguez Fernández, Jessica. Ludwig Maximilians Universitat; AlemaniaFil: Stefani, Fernando Daniel. Ludwig Maximilians Universitat; Alemania. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; ArgentinaFil: Feldmann, Jochen. Ludwig Maximilians Universitat; Alemani
Enhancing Single-Nanoparticle Surface-Chemistry by Plasmonic Overheating in an Optical Trap
Surface-chemistry of individual, optically trapped plasmonic
nanoparticles
is modified and accelerated by plasmonic overheating. Depending on
the optical trapping power, gold nanorods can exhibit red shifts of
their plasmon resonance (i.e., increasing aspect ratio) under oxidative
conditions. In contrast, in bulk exclusively blue shifts (decreasing
aspect ratios) are observed. Supported by calculations, we explain
this finding by local temperatures in the trap exceeding the boiling
point of the solvent that cannot be achieved in bulk