Contact area

About: Contact area is a research topic. Over the lifetime, 12358 publications have been published within this topic receiving 256401 citations. The topic is also known as: contact patch & contact region.

Substrate support with pressure zones having reduced contact area and temperature feedback

Abstract: An improved substrate support and method for operating in which multiple pressure zones are provided on the surface of the substrate support. A seal area is provided between the different zones to allow different gas pressures in the two zones. A higher gas pressure is provided to a zone corresponding to an area of the substrate where greater heat transfer is desired. The gap between the substrate support and the gas pressure are selected to provide the desired amount of heat transfer. Another aspect is limited substrate contact using protrusions, to maximize heat transfer gas flow. A closed loop control system varies the heat transfer gas pressure in accordance with a temperature sensor. For an electrostatic chuck, the dielectric thickness is varied to give a higher electrostatic force at the periphery of the substrate.

Artificial finger skin having ridges and distributed tactile sensors used for grasp force control

Abstract: An artificial elastic finger skin for robot fingers was developed for controlling the grasp force when the weight and friction coefficient of the grasped object are unknown. The elastic finger skin has ridges at the surface to divide the stick/slip area. It also has a pair of tactile sensors embedded per one ridge similar to human fingertips. The surface of the whole finger is curved so that the reaction force can be distributed. A finite element (FE) model of the elastic finger skin was developed to perform a dynamic contact analysis using the FE method in order to design the elastic finger skin. The elastic finger skin was then constructed. It was confirmed by calculation and experiment that the incipient slippage of the ridge that occurs near the edge of contact area can be detected. This result is useful for controlling the grasping force when the weight and friction coefficient between the elastic finger skin and grasping object are unknown.

Membrane electrochemical cell provided with gas diffusion electrodes in contact with porous, flat, metal current conductors having highly distributed contact area

Abstract: The present invention refers to an electrochemical cell or stack of cells comprising two end-plates (7), bipolar plates (1) made of metal or metal alloy, gas permeable metal distributors (2), metal current collectors(3), gasket frames (4) provided with channels for feeding the gaseous reactants and discharging the excess reactants and condensates, a couple of gas diffusion electrodes, (5), an ion-exchange membrane (6), wherein said current conductors provide for a highly distributed segmented contact area on the electrode surface without isolated peaks and have an extremely smooth surface without asperities and at the same time porous and permeable to the gas flow.

High-Resolution Contact Printing with Dendrimers

Abstract: We have used amine-terminated polyamidoamine (PAMAM) dendrimer generation 4 as ink for contact printing. Periodic dendrimer lines with widths of 140 nm and interline widths of 70 nm were printed directly on a silicon substrate. Without obvious molecular diffusion during printing, the printed pattern is only determined by the conformal contact area, which is in turn determined by the mechanical properties of elastomeric stamp.