نتایج جستجو برای: particle manipulation

تعداد نتایج: 235822  

Journal: :Lab on a chip 2012
Henrik Bruus

In Part 10 of the thematic tutorial series "Acoustofluidics-exploiting ultrasonic standing waves forces and acoustic streaming in microfluidic systems for cell and particle manipulation", we present and analyze a number of scaling laws relevant for microsystem acoustophoresis. Such laws are useful both in understanding, designing, and analyzing acoustofluidic devices.

Journal: :Lab on a chip 2012
Henrik Bruus

In the second part of the thematic tutorial series "Acoustofluidics--exploiting ultrasonic standing waves forces and acoustic streaming in microfluidic systems for cell and particle manipulation", we develop the perturbation theory of the acoustic field in fluids and apply the result in a study of acoustic resonance modes in microfluidic channels.

Journal: :Chemical communications 2010
Tian Tang Tanapak Metanawin Andrew Hebden Patrick McGowan Xiao-Song Wang

Manipulation of metal atom nucleation and particle growth in solution is virtually unexplored, but highly sought after for the creation of functional materials and rational design of supramolecular structures. We therefore decided to explore this area through the self-assembly of block copolymer micelles and Pd atoms without using a chemical reduction reaction.

2006
Orlin D. Velev Ketan H. Bhatt

We overview the ways in which electric fields can be used for on-chip manipulation and assembly of colloidal particles. Particles suspended in water readily respond to alternating (AC) or direct current (DC) electric fields. Charged particles in DC fields are moved towards oppositely charged electrodes by electrophoresis. Dielectrophoresis, particle mobility in AC fields, allows precise manipul...

Journal: :Optics express 2012
David Engström Michael C M Varney Martin Persson Rahul P Trivedi Kris A Bertness Mattias Goksör Ivan I Smalyukh

Stable optical trapping and manipulation of high-index particles in low-index host media is often impossible due to the dominance of scattering forces over gradient forces. Here we explore optical manipulation in liquid crystalline structured hosts and show that robust optical manipulation of high-index particles, such as GaN nanowires, is enabled by laser-induced distortions in long-range mole...

1998
Michael T. Kennedy Brian A. Korgel Harold G. Monbouquette Joseph A. Zasadzinski

Size-quantized CdS nanocrystals of controlled dimensions are synthesized within monodisperse egg lecithin vesicles made by detergent depletion. Cryo-transmission electron microscopy (cryo-TEM) enables imaging in situ both of the vesicle wall and of the encapsulated nanocrystal. Cryo-TEM images confirm that only one particle per vesicle forms and that nanocrystal diameter is determined by the nu...

Journal: :Optics express 2008
Maria Dienerowitz Michael Mazilu Peter J Reece Thomas F Krauss Kishan Dholakia

The confinement and controlled movement of metal nanoparticles and nanorods is an emergent area within optical micromanipulation. In this letter we experimentally realise a novel trapping geometry near the plasmon resonance using an annular light field possessing a helical phasefront that confines the nanoparticle to the vortex core (dark) region. We interpret our data with a theoretical framew...

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