K. Misiunas, N. Laohakunakorn, S. Ghosal, O. Otto, U. F. Keyser
University of Cambridge, Cambridge, UK
Northwestern University, Evanston, IL, USA
The motion of DNA in crowded environments is a common theme in physics and biology. Examples include gel electrophoresis and the self-interaction of DNA within cells and viral capsids. Here we study the interaction of multiple DNA molecules within a nanopore by tethering the DNA to a bead held in a laser optical trap to produce a "molecular tug-of-war". We measure this tether force as a function ...
L. Wright, G. Memoli, P. Jones, E. Stride
National Physical Laboratory, Teddington, UK
University College London, London, UK
University of Oxford, Oxford, UK
Understanding the interactions between microbubbles and surfaces is key to the successful deployment of microbubbles in a range of applications. Two important examples are their use as a drug delivery mechanism, and their potential use of acoustically-driven bubbles as microscale sensors. Drug delivery with bubbles involves sonication at high frequency close to a boundary, and sensing with ...
F. Bircher and P. Marmet
Institute of Print Technology, Bern University of Applied Sciences, Burgdorf, Switzerland
Electromagnetic micro valves are currently developed empirically or the different physics are treated separately. To accelerate the development-process and for a better understanding of the overall system, a multiphysics simulation is built up. This simulation considers the electromagnetics, the electronics (including the control of the process), the mechanics and the fluidics with respect to ...
A. Auge, A. Weddemann, F. Wittbracht, B. Vogel, and A. Hütten
Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany
The oxidation behavior of metallic nanoparticles is investigated in respect to material parameters like Mott potential, defects on the microstructure and oxide volume increase per ionic defect. An emphasis is laid on magnetic nanoparticles where the degree of oxidation can be measured via the reduction of the magnetic moment.
Huazhong University of Science and Technology, Wuhan, China
High magnetic field research has yielded fruitful results. Since 1913, associated with the magnetic field there are 19 Nobel Prizes, including a prize for medicine, five chemistry prizes, and 13 physics prizes. In recent years, the international community under the conditions of strong magnetic field is very active in scientific research, involving many disciplines such as physics, chemistry, ...
N. Badi, R. Mekala
Department of Physics, Center for Advanced Materials, University of Houston, Houston, TX, USA
Department of Electrical & Computer Engineering, University of Houston, Houston, TX, USA
Thermally conducting but electrically insulating materials are needed for heat-sink LED lighting applications. We report on a cost effective and innovative method based on creating core-shell nanoparticles in polymer with aluminum (Al) nanoparticles as the high thermal conductivity core and ultrathin aluminum oxide (Al?O?) as a capping shell. The solid oxide shell around the Al core prevents ...
Kunal A.Kshirsagar, K.Govardhan,
VIT University, Sensor System Technology, School of Electronics Engineering, Vellore, Tamil Nadu, India
VIT University, MEMS & Sensor Division, School of Electronics Engineering, Vellore, Tamil Nadu, India
Accelerometers are successfully commercialized MEMS devices. COMSOL Multiphysics® has been used in the modeling, simulation and optimizing of this design. The piezoresistive accelerometer is made up of a square proof mass with flexures supporting it. The piezoresistors are placed near the proof mass and frame ends of the flexure and the springs. There is an elongation or shortening of the ...
AC Electrothermal Characterization of Doped-Si Heated Microcantilevers Using Frequency-Domain Finite Element Analysis - new
K. Park, S. Hamian, A. M. Gauffreau, T. Walsh
Mechanical Engineering Department, University of Utah, Salt Lake City, UT, USA
Department of Mechanical, Industrial & Systems Engineering, University of Rhode Island, Kingston, RI, USA
This work investigates the frequency-dependent electrothermal behaviors of freestanding doped-silicon heated microcantilever probes operating under the periodic (ac) Joule heating. The transient heat conduction equation for each component (i.e., the low-doped heater region, the high-doped constriction region, and the high-doped leg region) is solved using the general heat transfer module for DC ...
L. Moro, F. Lugli, and F. Zerbetto
Department of Chemistry “G. Ciamician”, Università di Bologna, Bologna, Italy
Rotaxanes are a class of molecules recently developed in laboratory that have been heralded as possible molecular motors. The motor is constituted by a linear molecule (thread) and a ring-shaped molecule (macrocycle), which is free to move along the thread, switching between two, or more, energetically stable interaction points (stations). Molecular motors start their functioning far from ...
K. Suresh, B.V.M.P.S. Kumar, U.V. Kumar, M. Umapathy, and G. Uma
National Institute of Technology Tiruchirapalli, Tamil Nadu, India
A proximity DC current sensor using of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end is designed and simulated in COMSOL Multiphysics. The change in resonant frequency of cantilever is a measure of the current through the wire. The sensor is found to be linear with good sensitivity.