Topic
Tripod (photography)
About: Tripod (photography) is a research topic. Over the lifetime, 2693 publications have been published within this topic receiving 17089 citations.
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TL;DR: Multipod gold nanocrystals have been synthesized via a simple solution-phase chemical reduction method at room temperature and two types of structurally different particles are observed, including the regular tripod that lies on the substrate with its {111} plane, and the cross-like tetrapod that sits on its {100} plane.
Abstract: Multipod gold nanocrystals have been synthesized via a simple solution-phase chemical reduction method at room temperature. Two types of structurally different particles are observed, including the regular tripod, which lies on the substrate with its {111} plane, and the cross-like tetrapod that sits on its {100} plane. Both structures have pods of 10 nm sizes and grow along 〈110〉 directions. Variously shaped particles, including tadpole-like or teardrop-like monopods, 90° L-shaped, 180° I-shaped, and 120° V-shaped bipods, T-shaped, Y-shaped, and regular triangular tripods, and cross-like tetrapods, have been produced. Due to the high conductivity of metal, these branched structures are quite promising considering their applications as interconnections in the “bottom-up” self-assembly approach toward future nanocircuits and nanodevices, as well as in other related fields.
541 citations
236 citations
TL;DR: Four caltrop-shaped molecules that might be useful as surface-bound electric field-driven molecular motors have been synthesized and Ellipsometric studies show that self-assembled monolayers of the caltrops are formed on Au surfaces with molecular thicknesses consistent with the desired upright-shaft arrangement.
Abstract: Four caltrop-shaped molecules that might be useful as surface-bound electric field-driven molecular motors have been synthesized. The caltrops are comprised of a pair of electron donor-acceptor arms and a tripod base. The molecular arms are based on a carbazole or oligo(phenylene ethynylene) core with a strong net dipole. The tripod base uses a silicon atom as its core. The legs of the tripod bear sulfur-tipped bonding units, as acetyl-protected benzylic thiols, for bonding to a gold surface. The geometry of the tripod base allows the caltrop to project upward from a metallic surface after self-assembly. Ellipsometric studies show that self-assembled monolayers of the caltrops are formed on Au surfaces with molecular thicknesses consistent with the desired upright-shaft arrangement. As a result, the zwitterionic molecular arms might be controllable when electric fields are applied around the caltrops, thereby constituting field-driven motors.
161 citations
TL;DR: In this article, the nonlinear optical response of a four-level atomic system driven into a tripod configuration is analyzed and the large cross-Kerr nonlinearities that occur in such a system are shown to produce nonlinear phase shifts of order
Abstract: We analyze the nonlinear optical response of a four-level atomic system driven into a tripod configuration The large cross-Kerr nonlinearities that occur in such a system are shown to produce nonlinear phase shifts of order $\ensuremath{\pi}$ Such a substantial shift may be observed in a cold atomic gas in a magneto-optical trap where it could be feasibly exploited towards the realization of a polarization quantum phase gate The experimental feasibility of such a gate is here examined in detail
147 citations
01 Jan 2000
TL;DR: A novel three degree-of-freedom manipulator, which includes three in-parallel limbs between a fixed frame and a platform that moves by spherical rotation about a fixed point, is described and is presented succinctly and can be obtained from deductive reasoning.
Abstract: A novel three degree-of-freedom manipulator, which includes three in-parallel limbs between a fixed frame and a platform that moves by spherical rotation about a fixed point, is described. This mechanism is not overconstrained and has the structural type of the translational Tsai platform. Each limb is a sequence of a universal joint, a prismatic pair and a universal joint (UPU). The spherical rotation of the moving platform is obtained by variation of length in the linear actuators that are mounted on the prismatic pairs of the three limbs. Under some geometric constraint changes, we obtain a generalised structure of the mechanism. This arrangement belongs to a more general family of mechanisms, which is presented succinctly and can be obtained from deductive reasoning.
136 citations