We developed a flow measurement technique of velocity distribution in extended nanochannel (10- 1000 nm), using fluorescent tracer nanoparticles and the evanescent wave which penetrates into a liquid medium with an exponential decay from the [...]
The curved microchannel is frequently encountered in the lab-on-chips because it provides a convenient way for increasing channel length per unit area. The behavior of electrokinetic flow with curvature-induced secondary motion was explored based on [...]
The interest in magnetic nanoparticles and ferrofluids has grown substantially in recent years as their applications continue to proliferate. Current applications are diverse and include the transport of biomolecules and therapeutic drugs , gene transfection [...]
Magnetic particles are finding increasing use in microfluidic and lab-on-a-chip systems especially for bioapplications where they are commonly used to label, sort and separate target biomaterials from a sample. In this presentation we analyze the [...]
AC fields induce polarization charges at the structural interfaces inside inhomogeneous media (Maxwell-Wagner polarization). In suspensions or emulsions of micro and nano objects such as particles, oil droplets, air bubbles and biological cells, these structures [...]
, Chabrol, C.
, Fouillet, Y.
, Pudda, C.
, Texier-Nogues, I.
, CEA-LETI, FR
We perform ICP using radial silicon nanojunction geometries fabricated by single standard silicon microfabrication for proof of concept concentration operation over 50nm polystyrene nanobeads.We call the devices “Ring like devices” because of the circular shape [...]
Thiol-ene based materials have gained a considerable interest in the field of micro and nano fluidics because of their physico-chemical properties and their polymerization characteristics. Unfortunately, the hydrophobic nature of this material represents a considerable [...]
By utilizing the high gas permeability of PDMS, a simple syringe-assisted micropumping method is presented. A constant, controllable pumping rate ranging from 0.3 to 4 nl/s was achieved by controlling the gap distance (g) and [...]
Microfluidics have proven to be a useful tool in cell biology as they allow for precise control of chemistry and hydrodynamic loads at the scale of single cells. Channel-based microfluidics can be difficult to employ [...]
This paper studies the transport of a water droplet over a hydrophilic spot (representing the sensing surface of a biosensor) created on the top plate of a digital microfluidic chip. For this purpose, a closed [...]
We present a method for a parallel synchronization of multiple droplets with different concentrations in a continuous flow manner. Our previous device was modified (e.g., a synchronized droplet pairing (n=2) using a ladder-like fluidic network) [...]
, Bisaria, H.
, Choi, C-H
, Li, X.
, Tian, Y.
, Tsai, Y-T
, Xu, W.
, Yang, E.H.
, Stevens Institute of Technology, US
Electrowetting on dielectric (EWOD) technique has been used to manipulate microliter-sized individual droplets for microfluidic application. However, EWOD-based techniques typically require relatively high actuation voltages (12-80V), which is undesirable for biomedical applications or the applications [...]
For high throughput and high separation efficiency, the proposed sorting platform comprises meso-size vertical channel and silicon wafer based micro cantilever-type electrodes for generating n-DEP force and playing a role of micro-channel. To reduce engineering [...]
Recently, optical methods have been widely used for biological and chemical detection in microﬂuidic or lab-on-a-chip systems. Precise adjustment of the optical path among multiple integrated components, such as flow cytometers, optical tweezers, and molecule [...]
Various designs for new AC electro-thermal micro-pumps (ETµPs) are present which exploit AC electro-kinetic forces acting on smeared charges in the bulk of fluids in the presence of a temperature gradient. Measurements of the pump [...]
New metrology tools to measure the critical parameters of internal structures in lab on a chip devices are greatly needed in order to develop standard tests for this technology. Here we present a method that [...]
In the biotechnology science, microfluidics is constantly adapting to the goals of biologists. Once a precise goal has been identified, biotechnology is searching for the best approaches to meet the demand of biologists. These approaches [...]
It is important to separate human bone marrow-derived mesenchymal stem cells (hMSCs) with high multipotential to differentiation and to increase efficacy of cell therapy. We investigated to develop and validate a novel method for collection [...]
, Krishnan, G.
, Loth, R.
, Malm, P.
, Steele, A.
, University of Virginia, US
Preventing biofouling in natural bodies of freshwater is important for a wide variety of applications. The relationship between surface properties and antifouling has been the subject of many recent studies, with primary focus on long-term [...]
The human eye is a complex organ consisting of multiple different tissues with varying mechanical properties and functionality. Hence, there are many aspects of the biomechanical behavior of the eye that are not understood. In [...]
Absorption spectroscopy in nanofluidic channel was investigated for ultrasensitive detection of nonfluorescent molecules in nanospace. Recently, chemical analysis systems have been rapidly miniaturized from microspace to nanospace, which requires ultrasensitive detection of a broad range [...]
In this paper, the efficiency of nanofluid-based flat-plate solar collector is analytically evaluated by use of the extinction coefficient of nanofluids. The water-based multi wall carbon nanotube (MWCNT) nanofluids and water-based Ag nanofluids are selected [...]
, Barison, S.
, Battiston, S.
, Colla, L.
, Fabrizio, M.
, Fedele, L.
, Pagura, C.
, National Research Council of Italy (CNR), IT
With the aim of preparing stable nanofluids for heat exchange applications and to study the effect of surfactant on the aggregation of nanoparticles and thermal diffusivity, stable silver colloids were synthesized in water by a [...]
The studying the effective viscosity coefficient of the nanofluids is the object of present paper. Experimentally the viscosity of the nanofluids on basis of ethylene glycol and SiO2 nanoparticles was studied. It was shown that [...]
Reported here are experimental results of studies designed to identify the operable mechanisms responsible for the gains in thermal conductivity of nanoﬂuids based on nanocarbons. Comparison of functionalized versus nonfunctionalized nanocarbons addresses the effect of [...]
Mechanisms of ultrasound absorption in magnetic nanofluids at the absence of external magnetic field are theoretically studied in the first part of the paper. The novel magnetodynamic mechanism of ultrasound absorption is introduced – it [...]
Nanofluids are fluid formed by dispersing solid particles of size ranging 1-100 nm (nanoparticles) in a given base fluid such as water or oil, for example. Regarding to the thermal potential, the researches on nanofluids [...]
Thermophoresis plays an important role in forced and natural convection in channels and enclosures when nanofluids are used instead of pure fluids. Therefore, in order to be able to estimate the extent and role of [...]
Nano-enhanced phase change material (NEPCM) was prepared by two step method using distilled water as the base fluid, sodium dodecyl benzene sulphonate (SDBS) as a surfactant, pseudomonas as nucleating agent and multi-walled carbon nanotubes (MWCNT) [...]
In this work we describe a new approach to align functionalized single walled carbon nanotubes (SWNTs) by γ-Fe2O3 in the presence of an external magnetic field without using chemical surfactant. Five different functionalized SWNTs are [...]
Nanofluids were invented to enhance thermal conductivity of the working fluid near the wall region, where the conduction is the only mechanism to dissipate heat and it limits the heat transfer rate from a body [...]
Suspensions of nanometer-sized particles in liquids (nanofluids) are used in a variety of technological applications and biological systems. For example, their spreading and adhesion behavior on solid surfaces can yield materials with desirable structural and [...]
Nanofluids are the new expanding area in nanotechnology, with applications as wide as biomedical, lubrication, thermal management, energy generation, energy conversion, and energy storage. Variety and unique characteristics of nanomaterials allow for engineering the multifunctional [...]
Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2013: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational (Volume 2)
Published: May 12, 2013
Industry sector: Sensors, MEMS, Electronics
Topics: Modeling & Simulation of Microsystems