Dielectrophoresis
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Desenvolvimento e otimização de um método de deposição planar de nanotubos de carbono alinhados em solução
Com o objetivo de obter uma membrana fina e densa de nanotubos de carbono alinhados, neste trabalho é proposta a utilização de diferentes técnicas e uma possível interação entre elas. A dieletroforese (orientação em solução de partículas não carregadas sob o efeito de um campo elétrico) foi escolhida como a principal técnica de alinhamento, ma
Publicado em: 2010
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2. Numerical analysis of thermal and electrohydrodynamic effects in travelling-wave dielectrophoretic devices
Travelling-wave dielectrophoretic phenomena involving cell detection and manipulation are very interesting for biomedical and biotechnological applications. However, electrohydrodynamic phenomena may interfere with the action of dielectrophoresis. The main goal of our study is to calculate the interplay of these effects. In so doing, we have been able to go
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-12
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3. Controlled depositioin and characteristics of electrical properties of carbon nanotubes / Deposição controlada e caracteristicas das propriedades eletricas em nanotubos de carbono
Not informed
Publicado em: 2007
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4. Effects of La3+ on Surface Charges, Dielectrophoresis, and Electrofusion of Barley Protoplasts 1
When dielectrophoresis and electrofusion of barley (Hordeum vulgare var Moor) leaf protoplasts were assayed in the presence of 0.1 to 1 millimolar lanthanum ion (La3+) in the basal medium (0.7 molar mannitol, 1 millimolar piperazine-N, N-bis[2-ethanesulfonic acid]-Na [pH 6.7], 0.1 millimolar CaCl2), dielectrophoresis and induction of electrofusion were stron
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5. Introducing phase analysis light scattering for dielectric characterization: measurement of traveling-wave pumping.
Phase analysis light scattering (PALS) was applied to characterize a high-frequency traveling-wave (TW) micropump. Field strength and frequency characteristics were measured for aqueous solutions up to 40 MHz and conductivities of 16 mS/m. The TW field was generated by an ultramicroelectrode array of intercastellated electrodes, which were driven by square-t
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6. Membrane skeleton restraint of surface shape change during fusion of erythrocyte membranes: evidence from use of osmotic and dielectrophoretic microforces as probes.
The role of the spectrin-based membrane skeleton in cell fusion was studied by following the condition-dependent diameter versus time expansion signature of the fusion zone in electrofused pairs of erythrocyte ghost membranes. Previous work showed that the presence of the dielectrophoresis-inducing alternating electric field, which is used to bring membranes
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7. Introducing dielectrophoresis as a new force field for field-flow fractionation.
We present the principle of cell characterization and separation by dielectrophoretic field-flow fractionation and show preliminary experimental results. The operational device takes the form of a thin chamber in which the bottom wall supports an array of microelectrodes. By applying appropriate AC voltage signals to these electrodes, dielectrophoretic force
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8. Dielectrophoretic manipulation of cells with spiral electrodes.
Electrokinetic responses of human breast cancer MDA-MB-231 cells were studied in suspensions of conductivities 18, 56, and 160 mS/m on a microelectrode array consisting of four parallel spiral electrode elements energized with phase-quadrature signals of frequencies between 100 Hz and 100 MHz. At low frequencies cells were levitated and transported toward or
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9. High-efficiency loading, transfection, and fusion of cells by electroporation in two-phase polymer systems.
A method to concentrate drugs, DNA, or other materials with target cells in two-phase polymer systems for high-efficiency electroloading is described. The two-phase polymer system is utilized for cell and loading material selection, as well as for cell aggregation before electrofusion. The phase mixing of several water-soluble polymers is characterized, and
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10. Measurement of inherent particle properties by dynamic light scattering: introducing electrorotational light scattering.
Common dynamic light scattering (DLS) methods determine the size and zeta-potential of particles by analyzing the motion resulting from thermal noise or electrophoretic force. Dielectric particle spectroscopy by common microscopic electrorotation (ER) measures the frequency dependence of field-induced rotation of single particles to analyze their inherent di