ultrasonic agitation in microchannels

Microfluidic Mixing: A Review

May 18, 2011 The aim of microfluidic mixing is to achieve a thorough and rapid mixing of multiple samples in microscale devices In such devices, sample mixing is essentially achieved by enhancing the diffusion effect between the different species flows Broadly speaking, microfluidic mixing schemes can

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Ultrasonic agitation in microchannels Biomedical Engineering

Keywords Microchannels · Rotating vortex flow · Rayleigh flow · Acoustics · Ultrasonic agitation · Reagent mixing Introduction Two parallel flows, injected separately in a microfluidic channel, will stay separated and mix very slowly, because of the extreme laminar flow conditions that commonly ex

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A combinatorial approach to microfluidic mixing IOPscience

Bengtsson M and Laurell T 2004 Ultrasonic agitation in microchannels Anal Bioanal Chem 378 1716 21 Crossref PubMed Google Scholar Tsai J H and Lin L W 2002 Active microfluidic mixer and gas bubble filter driven by thermal bubble micropump Sensors Actuators 97 8 665 71

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Ultrasonic agitation in microchannels SpringerLink

Dec 20, 2003 Abstract This paper describes an acoustic method for inducing rotating vortex flows in microchannels An ultrasonic crystal is used to create an acoustic standing wave field in the channel and thus induce a Rayleigh flow transverse to the laminar flow in the channel

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Role of ultrasonic oscillation in chemical processes in

The mixing of highly viscous fluids can also be enhanced in ultrasonic microreactors Wang, Huang, and Yang 2011 used a piezoelectric disk to introduce ultrasound into circular microchannels for enhanced mixing of waterglycerol solutions Bubble oscillation enabled good mixing within 24 s, at glycerol viscosities up to 44 75 mPa s

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Microchannel formation through Foturan with IR fs and UV

of microchannels were made with each laser by changing the pulse energy with ultrasonic agitation for selective etching of irradiated material Two different acid concentrations 5 HF and 10 HF in volume were tested in order to study how they affect microchannel formation

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Exploiting the Oxygen Inhibitory Effect on UV Curing in

The difficulty of fabricating microchannels with high depth but narrow width aspect ratio 2 0 arises because it is hard to remove sticky semi cured or uncured resin without collapsing such microstructures during the long time they undergo ultrasonic agitation in water

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Microscopic steady streaming eddies created around short

Dec 28, 2004 Microscopic steady streaming eddies created around short cylinders in a channel: Flow visualization and Stokes layer scaling Physics of Fluids 17, 023601 2005 Ultrasonic agitation in microchannels, Anal Bioanal Chem 378, 1716 2004

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Exploiting the Oxygen Inhibitory Effect on UV

This effect originates from over curing of the resin during the second exposure which makes the cleaning process of the semi cured material difficult Ultrasonic agitation in water was able to remove the unexposed resin in the inter pillar area within 20 minutes giving a clean surface without damaging the pillars crosslinked to the root plane

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Acoustic Streaming Ultrasonic Agitation in Microchannels

Acoustic Streaming Ultrasonic Agitation in Microchannels Bengtsson, Martin LU and Laurell, Thomas LU 2 p 939 942 Mark Abstract This paper describes an acoustic method to induce rotating vortexflows in microchannels

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IET Digital Library: Additively manufactured heterogeneous

The concept of using additive manufacturing as a method to construct heterogeneous substrates from a single building material via stereolithography is introduced The dynamic variation of air cavities within the bulk material is used to control the effective permittivity of the host medium The digitally driven layer process enables full three dimensional variation of the local permittivity

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Acoustic Streaming Ultrasonic Agitation in Microchannels

with higher ultrasonic effect it is possible to get much higher agitation effect Conclusion A method to introduce a lateral vortexflow, Rayleigh flow, in microchannels is demonstrated The ability to acoustically induce a lateral vortexflow gives a possibility to increase the

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PRESSURE DROP IN MICROCHANNELS FILLED WITH

The pressure drop in microchannels filled with porous media formed by square arrays of cylinders microchannels while the pressure drop is lower Micro porous channels also have potential ultrasonic agitation for 5 minutes and then rinsed with de ionized DI water, acetone, isopropyl

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Article Characterization of the Fluidity of the Ultrasonic

spiral flow testing based on an Archimedes spiral mold with microchannels Mold inserts with Moreover, the ultrasonic agitation effect starts from the plasticization of the polymer pellets, which is substantially extended in comparison with traditional extrusion/injection molding Therefore, the fluidity of the polymer melt can be further

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US7872400B2 Ultrasonic device with a disk shaped

The present invention refers to an ultrasonic device comprising an ultrasound transducer and a disk shaped metallic low frequency ultrasound NFLUS resonator being mechanically connected with the ultrasound transducer on one side of the resonator a container with an opening on its bottom side and being arranged on the other side of the disk shaped resonator such that the opening is facing

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Ultrasonic agitation in microchannels, Analytical and

Dec 20, 2003 Ultrasonic agitation in microchannels Ultrasonic agitation in microchannels Bengtsson, Martin Laurell, Thomas 2003 12 20 00:00:00 This paper describes an acoustic method for inducing rotating vortex flows in microchannels An ultrasonic crystal is used to create an acoustic standing wave field in the channel and thus induce a Rayleigh flow transverse to the laminar flow in

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Acoustic Streaming Ultrasonic Agitation in Microchannels

Acoustic Streaming Ultrasonic Agitation in Microchannels By Martin Bengtsson and Thomas Laurell Abstract This paper describes an acoustic method to induce rotating vortexflows in microchannels The method is tested on two different systems, a mixing channel with two paralell flows and a porous silicon microreactor for protein digestion

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MID Fabricated by Ultrasonic Processing

Electronic circuit boards have been fabricated in cycle times of a few seconds by ultrasonic fabrication A stack of thermoplastic polymer foils with a copper layer, 20 μm in thickness, on top is transformed into a polymer carrier with separated conductor paths This process is accomplished in cycle times of a few seconds and the required equipment is just a commercially available ultrasonic

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Ultrasound in Enzyme Activation and Inactivation

Oct 29, 2010 As discussed in previous chapters, most effects due to ultrasound arise from cavitation events, in particular, collapsing cavitation bubbles These collapsing bubbles generate very

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Young Swedish physicist wins first ABC Best DeepDyve

May 20, 2005 Read Young Swedish physicist wins first ABC Best Paper Award, Analytical and Bioanalytical Chemistry on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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Ultrasonic agitation in microchannels ResearchGate

Ultrasonic agitation in microchannels This paper describes an acoustic method for inducing rotating vortex flows in microchannels An ultrasonic crystal is used to create an acoustic standing

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Fluid mixing in planar spiral microchannels Lab on a

Dean effects have been investigated to study mixing in serpentine like microchannels 39,44,45 As fluid flows downstream in a curved channel, centrifugal effects pull the fluid that is closer to the inner wall radially along the midplane towards the outer wall Simultaneously, fluid that is closer to the outer wall is swept inwards along the channel walls

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Ultrasonic agitation in microchannels Lund University

Ultrasonic agitation in microchannels Bengtsson, Martin LU and Laurell, Thomas LU In Analytical and Bioanalytical Chemistry 378 7 p 1716 1721 Mark Abstract This paper describes an acoustic method for inducing rotating vortex flows in microchannels

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Young Swedish physicist wins first ABC Best DeepDyve

May 20, 2005 Read Young Swedish physicist wins first ABC Best Paper Award, Analytical and Bioanalytical Chemistry on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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device for single particle counting A nanochannel through

with ultrasonic agitation for 15 minutes Then, it is rinsed in water This lift off process removes microchannels by sandblasting in the glass substrates or drilling in the polycarbonate ones to introduce liquid into the fluidic circuitry of the device Then,

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Ultrasound in Enzyme Activation and Inactivation

Oct 29, 2010 As discussed in previous chapters, most effects due to ultrasound arise from cavitation events, in particular, collapsing cavitation bubbles These collapsing bubbles generate very

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ELECTRONICS AND ELECTRICAL ENGINEERING ISSN 1392

devices have been reported Fabrication of microchannels as the main parts of the microfluidic systems plays an important role in operation of the entire system Different techniques can be utilized for fabrication of microchannels SU 8 as a low cost negative resist is a famous material to make vertical and high aspect ratio structures Using SU 8

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International Journal of Chemical Engineering Hindawi

International Journal of Chemical Engineering is a peer reviewed, Open Access journal that publishes original research articles as well as review articles on technologies for the production, processing, transportation, and use of chemicals on a large scale

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Characterization of the Fluidity of the Ultrasonic

The fluidity of a molten polymer plasticized by ultrasonic vibration was characterized by spiral flow testing based on an Archimedes spiral mold with microchannels Mold inserts with various channel depths from 250 to 750 µm were designed and fabricated to represent the size effect under micro scale The effect of ultrasonic plasticizing parameters and the mold temperature on the flow length

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Fabrication of Plastic Micro Features on Microporous Mold

The study developed a method of using ultrasonic vibration to heat the polymer and hot embossing high precision micro features A commercial ultrasonic welding machine is converted to provide the heating of polymer and mold then into precision micro features for study of ultrasonic heating and the microflow of polymer under ultrasonic agitation

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Fabrication of implantable microshunt using a novel

Fabrication of implantable microshunt using a novel channel sealing technique Alioune Diouf, Gregory Reimann, and Thomas Bifano directed through the microchannels, and exit in the supra the mild ultrasonic agitation used to etch away the photoresist lasts 15 min

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Microscopic steady streaming eddies created around short

Dec 28, 2004 Microscale steady streaming eddies created using low intensity fluid oscillations offer appealing options for controlling fluids in microfluidic systems

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Study of Ultrasonically Induced Fluid Flows Using Micro

May 28, 2009 This paper describes our recently started research into the flow phenomena that occur in microchannels and microcavities during ultrasonic agitation With micro particle image velocimetry we have seen rapidly changing flows together with the occurrence of cavitation events

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gp · ~× â! Ù ,àjqÞ GåY ^ A~ ºE¢ å½ڐ

178 Freitas, S , Walz, A , Merkle, H P and Gander, B , Solvent extraction employing a static micromixer: a simple, robust and versatile technology for the

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Ultrasonic Mixing in Microfluidic Channels Using

May 11, 2004 Effective mixing of laminar flows at a density interface by an integrated ultrasonic transducer Lab on a Chip 2009, 9 2 , 297 DOI: 10 1039/b815114h Linda Johansson, Stefan Johansson, Fredrik Nikolajeff, Sara Thorslund Effective mixing of laminar flows at a density interface by an integrated ultrasonic transducer

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RAPID, LOW COST FABRICATION OF PARYLENE

although it required an additional ultrasonic agitation for release Therefore, our conclusion of release experiments is that stainless steel sheet can be used for the fabrication of general microchannels or electrophoretic channels having simple electrode but that glass

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EP1434656A2 Ultraschallvorrichtung zur übertragung von

ultrasonic ultrasound characterized device according elements Prior art date 2001 10 04 Legal status The legal status is an assumption and is not a legal conclusion Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed Withdrawn Application number EP20020787342 Other languages English en

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PRESSURE DROP IN MICROCHANNELS FILLED WITH

The pressure drop in microchannels filled with porous media formed by square arrays of cylinders microchannels while the pressure drop is lower Micro porous channels also have potential ultrasonic agitation for 5 minutes and then rinsed with de ionized DI water, acetone, isopropyl

Get Price

Micro Total Analysis Systems 2003

ACOUSTIC STREAMING ULTRASONIC AGITATION IN MICROCHANNELS 939 M Bengtsson and T Laurell Lund Institute of Technology MEASUREMENT OF FAST KINETICS IN A MICROFLUIDIC SYSTEM 943 C Baroud', L Menetrier 2, F Okkels and P Tabeling1 'Ecole Polytechnique and 2ESPCI SURFACE MOUNT MICROFLUIDIC FLOW REGULATOR ON A POLYMER SUBSTRATE 947

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PDF Fabrication of Glass based Microfluidic Devices with

The standard glass slides with 25mm呇mm and devices have been reported Fabrication of microchannels 1mm thickness were utilized The fabrication process starts as the main parts of the microfluidic systems plays an with cleaning glass substrate using ultrasonic in acetone important role in operation of the entire system

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Nanoparticle doped Electrically conducting Polymers for

1 ultrasonic agitation, 2 shear mixing, and 3 ball milling The most popular technique is ultrasonic agitation, in which the nanoparticles are first manually stirred in a solvent and then exposed to ultrasonic waves/irradiation There are two different types of ultrasonic waves that can be used The first type is low frequency ultrasonics

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Role of ultrasonic oscillation in chemical processes in

The mixing of highly viscous fluids can also be enhanced in ultrasonic microreactors Wang, Huang, and Yang 2011 used a piezoelectric disk to introduce ultrasound into circular microchannels for enhanced mixing of waterglycerol solutions Bubble oscillation enabled good mixing within 24 s, at glycerol viscosities up to 44 75 mPa s

Get Price

PDF Cavitation in microchannels ResearchGate

Hydrodynamic cavitation in microchannels is describes our recently started research into the flow phenomena that occur in microchannels and microcavities during ultrasonic agitation With

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Heat transfer and fluid flow characteristics in

Heat transfer and fluid flow characteristics in microchannels heat exchanger using nanofluids: A review a comprehensive review on the work done regarding to heat transfer and fluid flow characteristics in microchannels heat exchanger using conventional fluids as well as nanofluids is also described surfactants and ultrasonic agitation

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OSA Imaging local acoustic pressure in microchannels

A method for determining the spatially resolved acoustic field inside a water filled microchannel is presented The acoustic field, both amplitude and phase, is determined by measuring the change of the index of refraction of the water due to local pressure using stroboscopic illumination Pressure distributions are measured for the fundamental pressure resonance in the water and two higher

Get Price

Microscopic steady streaming eddies created around short

Dec 28, 2004 Microscopic steady streaming eddies created around short cylinders in a channel: Flow visualization and Stokes layer scaling Physics of Fluids 17, 023601 2005 Ultrasonic agitation in microchannels, Anal Bioanal Chem 378, 1716 2004

Get Price

OSA Imaging local acoustic pressure in microchannels

A method for determining the spatially resolved acoustic field inside a water filled microchannel is presented The acoustic field, both amplitude and phase, is determined by measuring the change of the index of refraction of the water due to local pressure using stroboscopic illumination Pressure distributions are measured for the fundamental pressure resonance in the water and two higher

Get Price

A combinatorial approach to microfluidic mixing IOPscience

Bengtsson M and Laurell T 2004 Ultrasonic agitation in microchannels Anal Bioanal Chem 378 1716 21 Crossref PubMed Google Scholar Tsai J H and Lin L W 2002 Active microfluidic mixer and gas bubble filter driven by thermal bubble micropump Sensors Actuators 97 8 665 71

Get Price

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