Showing papers by "Peter Zijlstra published in 2011"
TL;DR: In this paper, a review of far-field optical techniques that have sufficient sensitivity to detect single metal particles is presented, and the importance of single-particle detection techniques in their development is emphasized.
Abstract: Since the first report on the far-field optical detection of single metal nanoparticles in the late 1990s, the field has rapidly developed and new methods and concepts have been introduced Eliminating averaging over the broad size, shape and crystallinity distributions produced by even the best of current synthesis methods, these techniques have proven extremely useful for gaining a deeper insight into many of the properties of metal nanoparticles These techniques have already led to the first applications specifically directed at using single particles In this review we describe far-field optical techniques (both linear and nonlinear) that have sufficient sensitivity to detect single metal particles We further discuss emerging applications, and emphasize the importance of single-particle detection techniques in their development
263 citations
TL;DR: The first quantitative measurements of the torque exerted on a single gold nanorod in a polarized three-dimensional optical trap are presented, in good agreement with calculations, where the temperature profile around the hot nanorode gives rise to a reduced, effective viscosity.
Abstract: We present the first quantitative measurements of the torque exerted on a single gold nanorod in a polarized three-dimensional optical trap. We determined the torque both by observing the time-averaged orientation distribution and by measuring the dynamics of the rotational Brownian fluctuations. The measurements are in good agreement with calculations, where the temperature profile around the hot nanorod gives rise to a reduced, effective viscosity. The maximum torque on a $60\text{ }\text{ }\mathrm{nm}\ifmmode\times\else\texttimes\fi{}25\text{ }\text{ }\mathrm{nm}$ nanorod was $100\text{ }\text{ }\mathrm{pN}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{nm}$, large enough to address single-molecule processes in soft and biological matter.
126 citations
TL;DR: In this paper, the chemical kinetics of the silver-mediated growth of gold nanorods prepared by the reduction of gold precursor in aqueous cetyltrimethylammonium bromide (CTAB) solution has been systematically studied using spectroscopic monitoring and electron microscopy.
Abstract: The chemical kinetics of the silver-mediated growth of gold nanorods prepared by the reduction of gold precursor in aqueous cetyltrimethylammonium bromide (CTAB) solution has been systematically studied using spectroscopic monitoring and electron microscopy. The rate of monomer depletion −d[Aun+]/dt has a linear dependence on both [Aun+] and seed nuclei concentration at 30 °C. Particle growth is significantly retarded by hexadecyltrimethylammonium bromide (CTAB) and KBr, with the order ca. −1 for [Br–]. The rate of nanoparticle growth is dependent on the reducing ascorbate monoanion concentration and is consequently highly pH dependent around the pKa1 of ascorbic acid, while AgNO3 retards the observed kinetics for both the growth of nanorods from ca. 2 nm seed nuclei and the overgrowth of Au nanorods.
78 citations