Name: microparticle manipulation by standing surface acoustic waves with dual-frequency excitations
Uploaded: 2018-08-21T14:30:00
Description: Watch this Scientific Journal Video about Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations at JoVE.com

Dette arbejde blev sponsoreret af akademiske forskningsfond (AcRF) Tier 1 (RG171/15), Undervisningsministeriet, Singapore.

1. forberedelse af den mikrofluid kanal
<ol><li>Bland poly-dimethylsiloxane (PDMS) med en elastomer base i forholdet 10:1.</li>
	<li>Degas blandingen i et vakuum ovn og hæld det på en silicium wafer med en negativ tone photoresist mønster på toppen.</li>
	<li>Degas mønstrede silicium wafer igen og varme den på 70 ° C til 3 h i en inkubator for størkning.</li>
</ol>2. fabrikation af håndfladens transducere
<ol><li>Indbetaling 20 nm af Cr og 400 nm af Al på en LiNbO3 wafer; ...

<ol>
	<li>Chin, C. D., Linder, V., Sia, S. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Commercialization+of+microfluidic+point-of-care+diagnostic+devices.">Commercialization of microfluidic point-of-care diagnostic devices.</a> Lab on a Chip. 12 (12), 2118-2134 (2012).</li><li>Figeys, D., Pinto, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lab-on-a-chip:+a+revolution+in+biological+and+medical+sciences.">Lab-on-a-chip: a revolution in biological and medical sciences.</a> Analytical Chemistry. 72 (9), 330 A-335 A (2000).</li><li>den Toonder, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Circulating+tumor+cells:+the+Grand+Challenge.">Circulating tumor cells: the Grand Challenge.</a> Lab on a Chip. 11 (3), 375-377 (2011).</li><li>Yu, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advances+of+lab-on-a-chip+in+isolation,+detection+and+post-processing+of+circulating+tumour+cells.">Advances of lab-on-a-chip in isolation, detection and post-processing of circulating tumour cells.</a> Lab on a Chip. 13 (16), 3163-3182 (2013).</li><li>Jorgenson, J. W., Lukacs, K. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-resolution+separations+based+on+electrophoresis+and+electroosmosis.">High-resolution separations based on electrophoresis and electroosmosis.</a> Journal of Chromatography A. 218, 209-216 (1981).</li><li>Gascoyne, P. 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Y., Ohta, A. T., Wu, M. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Massively+parallel+manipulation+of+single+cells+and+microparticles+using+optical+images.">Massively parallel manipulation of single cells and microparticles using optical images.</a> Nature. 436 (7049), 370-372 (2005).</li><li>Yamada, M., Seki, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hydrodynamic+filtration+for+on-chip+particle+concentration+and+classification+utilizing+microfluidics.">Hydrodynamic filtration for on-chip particle concentration and classification utilizing microfluidics.</a> Lab on a Chip. 5 (11), 1233-1239 (2005).</li><li>Burguillos, M. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microchannel+acoustophoresis+does+not+impact+survival+or+function+of+microglia,+leukocytes+or+tumor+cells.">Microchannel acoustophoresis does not impact survival or function of microglia, leukocytes or tumor cells.</a> PLoS One. 8 (5), e64233 (2013).</li><li>Lin, S. -. C. S., Mao, X., Huang, T. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Surface+acoustic+wave+(SAW)+acoustophoresis:+now+and+beyond.">Surface acoustic wave (SAW) acoustophoresis: now and beyond.</a> Lab on a Chip. 12 (16), 2766-2770 (2012).</li><li>Petersson, F., &#197;berg, L., Sw&#228;rd-Nilsson, A. -. M., Laurell, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Free+flow+acoustophoresis:+microfluidic-based+mode+of+particle+and+cell+separation.">Free flow acoustophoresis: microfluidic-based mode of particle and cell separation.</a> Analytical Chemistry. 79 (14), 5117-5123 (2007).</li><li>Ding, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=On-chip+manipulation+of+single+microparticles,+cells,+and+organisms+using+surface+acoustic+waves.">On-chip manipulation of single microparticles, cells, and organisms using surface acoustic waves.</a> Proceedings of the National Academy of Sciences. 109 (28), 11105-11109 (2012).</li><li>Friend, J., Yeo, L. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microscale+acoustofluidics:+Microfluidics+driven+via+acoustics+and+ultrasonics.">Microscale acoustofluidics: Microfluidics driven via acoustics and ultrasonics.</a> Reviews of Modern Physics. 83 (2), 647 (2011).</li><li>Destgeer, G., Lee, K. H., Jung, J. H., Alazzam, A., Sung, H. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Continuous+separation+of+particles+in+a+PDMS+microfluidic+channel+via+travelling+surface+acoustic+waves+(TSAW).">Continuous separation of particles in a PDMS microfluidic channel via travelling surface acoustic waves (TSAW).</a> Lab on a Chip. 13 (21), 4210-4216 (2013).</li><li>Guo, F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Controlling+cell-cell+interactions+using+surface+acoustic+waves.">Controlling cell-cell interactions using surface acoustic waves.</a> Proceedings of the National Academy of Sciences. 112 (1), 43-48 (2015).</li><li>Ding, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+separation+using+tilted-angle+standing+surface+acoustic+waves.">Cell separation using tilted-angle standing surface acoustic waves.</a> Proceedings of the National Academy of Sciences. 111 (36), 12992-12997 (2014).</li><li>Roshchupkin, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=X-ray+diffraction+by+standing+surface+acoustic+waves.">X-ray diffraction by standing surface acoustic waves.</a> Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 142 (3), 432-436 (1998).</li><li>Shi, J., Mao, X., Ahmed, D., Colletti, A., Huang, T. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Focusing+microparticles+in+a+microfluidic+channel+with+standing+surface+acoustic+waves+(SSAW).">Focusing microparticles in a microfluidic channel with standing surface acoustic waves (SSAW).</a> Lab on a Chip. 8 (2), 221-223 (2008).</li><li>Ding, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Surface+acoustic+wave+microfluidics.">Surface acoustic wave microfluidics.</a> Lab on a Chip. 13 (18), 3626-3649 (2013).</li><li>King, L. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=On+the+acoustic+radiation+pressure+on+spheres.">On the acoustic radiation pressure on spheres.</a> Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. , 212-240 (1934).</li><li>Yosioka, K., Kawasima, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acoustic+radiation+pressure+on+a+compressible+sphere.">Acoustic radiation pressure on a compressible sphere.</a> Acta Acustica United with Acustica. 5 (3), 167-173 (1955).</li><li>Ratier, C., Hoyos, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acoustic+programming+in+step-split-flow+lateral-transport+thin+fractionation.">Acoustic programming in step-split-flow lateral-transport thin fractionation.</a> Analytical Chemistry. 82 (4), 1318-1325 (2010).</li><li>Mandralis, Z., Feke, D., Bolek, W., Burger, W., Benes, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhanced+synchronized+ultrasonic+and+flow-field+fractionation+of+suspensions.">Enhanced synchronized ultrasonic and flow-field fractionation of suspensions.</a> Ultrasonics. 32 (2), 113-122 (1994).</li><li>Laurell, T., Petersson, F., Nilsson, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chip+integrated+strategies+for+acoustic+separation+and+manipulation+of+cells+and+particles.">Chip integrated strategies for acoustic separation and manipulation of cells and particles.</a> Chemical Society Reviews. 36 (3), 492-506 (2007).</li><li>Liu, Y., Lim, K. -. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Particle+separation+in+microfluidics+using+a+switching+ultrasonic+field.">Particle separation in microfluidics using a switching ultrasonic field.</a> Lab on a Chip. 11 (18), 3167-3173 (2011).</li><li>Brissaud, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+piezoceramics.">Characterization of piezoceramics.</a> IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 38 (6), 603-617 (1991).</li><li>Ding, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tunable+patterning+of+microparticles+and+cells+using+standing+surface+acoustic+waves.">Tunable patterning of microparticles and cells using standing surface acoustic waves.</a> Lab on a Chip. 12 (14), 2491-2497 (2012).</li><li>Jo, M. C., Guldiken, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Particle+manipulation+by+phase-shifting+of+surface+acoustic+waves.">Particle manipulation by phase-shifting of surface acoustic waves.</a> Sensors and Actuators A: Physical. 207, 39-42 (2014).</li><li>Meng, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transportation+of+single+cell+and+microbubbles+by+phase-shift+introduced+to+standing+leaky+surface+acoustic+waves.">Transportation of single cell and microbubbles by phase-shift introduced to standing leaky surface acoustic waves.</a> Biomicrofluidics. 5 (4), 044104 (2011).</li><li>Sriphutkiat, Y., Zhou, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Particle+manipulation+using+standing+surface+acoustic+waves+(SSAW)+at+dual+frequency+excitation:+effect+of+power+ratio.">Particle manipulation using standing surface acoustic waves (SSAW) at dual frequency excitation: effect of power ratio.</a> Sensors and Actuators A: Physical. 263, 521-529 (2017).</li><li>Batchelor, G. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> An Introduction to Fluid Dynamics. , (2000).</li><li>Glynne-Jones, P., Hill, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acoustofluidics+23:+acoustic+manipulation+combined+with+other+force+fields.">Acoustofluidics 23: acoustic manipulation combined with other force fields.</a> Lab on a Chip. 13 (6), 1003-1010 (2013).</li><li>Winkler, A., Br&#252;nig, R., Faust, C., Weser, R., Schmidt, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Towards+efficient+surface+acoustic+wave+(SAW)-based+microfluidic+actuators.">Towards efficient surface acoustic wave (SAW)-based microfluidic actuators.</a> Sensors and Actuators A: Physical. 247, 259-268 (2016).</li><li>Chen, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Standing+surface+acoustic+wave+(SSAW)-based+microfluidic+cytometer.">Standing surface acoustic wave (SSAW)-based microfluidic cytometer.</a> Lab on a Chip. 14, 916-923 (2014).</li><li>Devendran, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+importance+of+travelling+wave+components+in+standing+surface+acoustic+wave+(SSAW)+systems.">The importance of travelling wave components in standing surface acoustic wave (SSAW) systems.</a> Lab on a Chip. 16, 3756-3766 (2016).</li><li>Destgeer, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Submicron+separation+of+microspheres+via+travelling+surface+acoustic+waves.">Submicron separation of microspheres via travelling surface acoustic waves.</a> Lab on a Chip. 14, 4665-4672 (2014).</li><li>Ding, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Standing+surface+acoustic+wave+(SSAW)+based+multichannel+cell+sorting.">Standing surface acoustic wave (SSAW) based multichannel cell sorting.</a> Lab on a Chip. 12, 4228-4231 (2012).</li><li>Chen, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Continuous+enrichment+of+low-abundance+cell+samples+using+standing+surface+acoustic+waves+(SSAW).">Continuous enrichment of low-abundance cell samples using standing surface acoustic waves (SSAW).</a> Lab on a Chip. 14, 924-930 (2014).</li></ol>

Microparticle bevægelse i microchannel af en SSAW på den dobbelt-frekvens excitation blev grundigt undersøgt i denne undersøgelse, og et effektivt afstemmelige mønstre teknik ved at variere dobbelt-frekvens excitation signaler blev udviklet og afprøvet. Produktion af sådan en bølgeform er let indset ved de fleste funktion generatorer, og justere tilgang er meget bekvemt. Både S12- og S11-hyppighed svar i de fabrikerede IDTs illustrerer flere resonant tilstande34. Den...

LOC teknologi integrerer en eller flere funktioner på en mikrochip for biologi, kemi, Biofysik og biomedicinsk processer. LOC tillader en laboratorium set-up i skala mindre end sub millimeter, hurtig reaktion priser, en kort responstid, en høj proceskontrol, en lav lydstyrke forbrug (mindre affald, lavere reagenser omkostninger og mindre kræves sample volumen), en høj overførselshastighed skyldes parallelisering, en simpel omkostninger fremover masseproduktion og omkostningseffektiv engangsartikler, en høj sikkerhed for kemiske, radioaktive eller biologiske undersøgelser og fordelene ved en kompakt og bærbar enhed1,2. Præcise celle manipulation (dvs., akkumulering og adskillelse) er kritisk i en LOC-baseret analyse og diagnose3,4. Men, nøjagtighed og reproducerbarhed af microparticle manipulation har en række udfordringer. Mange teknikker, såsom electro-osmose5, dielektroforesis (DEP)6, magnetophoresis7, thermophoresis8,9, en optisk tilgang10, en optoelektroniske tilgang11 , en hydrodynamiske tilgang12, og acoustophoresis13,14,15, er blevet udviklet. I sammenligning er akustisk tilgange passende for en LOC program fordi teorien, mange typer af mikropartikler/celler kan manipuleres effektivt og noninvasively med en tilstrækkelig høj kontrast (tæthed og kompressionsevne) sammenlignet med den omkringliggende væske. Derfor, i forhold til deres kolleger, akustisk tilgange er i sagens natur berettiget til de fleste mikropartikler og biologiske genstande, uanset deres optiske, elektriske og magnetiske egenskaber16.
Overflade akustiske bølger (Save) fra IDTs udbrede det meste på overfladen af en piezoelektriske substrat på tykkelsen af flere bølgelængder og derefter lækage i Rayleigh vinkel ind i væsken i microchannel, ifølge den Snells lov17, 18,19,20,21,22. De har de tekniske fordele ved en høj energieffektivitet langs overfladen på grund af deres lokalisering af energien, en stor design fleksibilitet ved høj frekvens, et godt systemintegration med mikrofluid kanal og miniaturisering ved hjælp af Micro-elektroniske-mekanisk system (MEMS) teknologi, og et stort potentiale af masseproduktion23. I denne protokol, er Save genereret fra et par af identiske IDTs og opformeret i den modsatte retning til at generere en stående bølge eller SSAW, i microchannel, hvor de suspenderede mikropartikler er skubbet til pres noder, det meste af den anvendte akustisk stråling kraft24. Amplituden af sådanne resulterende kraft bestemmes af excitation frekvens, microparticle størrelse og dens akustiske kontrast faktor22,25.
Sådanne acoustophoresis har begrænsning af forudbestemt manipulere mønstre, der ikke er let justerbare. Excitation hyppigheden af IDTs er bestemt af deres periodiske afstand, så båndbredden er ret begrænset. Flere strategier er udviklet til at forbedre tunability og manipulation evnen. De første og anden tilstande af akustiske stående bølger anvendes i forskellige dele af microchannel kunne adskille mikropartikler mere effektivt efter forskellige bevægelse hastighed mod nodal linjer26. Disse to tilstande kan også anvendes på hele del af microchannel og skiftede alternativt27,28,29. Dog, er et stort antal udstyr (dvs., tre funktion generatorer, to impedans matchende enheder og en elektromagnetisk relæ) påkrævet, med den øgede omkostninger og kontrol kompleksitet af de eksperimentelle set-up på grund af de forskellige elektriske impedances på grundlæggende frekvens og tredje harmoniske af piezoceramic plade30. Derudover kunne skrå finger håndfladens transducere (SFITs) anvendes til at justere cellerne og mikropartikler mønster af spændende en periode af de skrå fingre for en vis resonans20,31. Men så, båndbredden, der er omvendt proportional med antallet af skrå fingre. Flere pres nodal linjer har en højere adskillelse effektivitet og følsomhed i forhold til de enkelt nodal linje i den konventionelle SSAW-baserede microparticle separator. Placeringen af pres noder kunne alternativt også ændres blot ved at justere fase forskellen anvendes til de to IDTs i design32,33.
Den grundlæggende frekvens og den tredje harmoniske af IDTs har lignende hyppighed svar, så de kan blive ophidset samtidigt, hvilket giver mere tunability for mikropartikler manipulation34. I forhold til konventionelle IDT excitation på en enkelt frekvens, justere det akustiske pres af den dobbelt-frekvens excitation og fase mellem dem giver teknisk entydighed, som op til ~ 2-fold reduceret bevægelse tid presset nodal linje eller center microchannel, varieret antal og placering af trykket nodal linjer og microparticle koncentrationer.

<table border="0" cellpadding="0" cellspacing="0" width="689">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:257px;">poly-dimethylsiloxane</td>
			<td style="width:147px;">Dow Corning</td>
			<td style="width:119px;">Sylgard 184</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">poly-dimethylsiloxane elastomer base</td>
			<td>Dow Corning</td>
			<td>Sylgard 184</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">silicon wafer</td>
			<td>Bonda Technology</td>
			<td>SI8PSPD</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">negative tone photoresist</td>
			<td>Microchem</td>
			<td>SU-8</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">double-side polished LiNbO3 wafer</td>
			<td>University Wafer</td>
			<td style="width:119px;">Y-128&#176;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">positive photoresist</td>
			<td>Nicolaus-Otto-Stra&#223;e</td>
			<td>AZ 9260</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">oxygen plasma</td>
			<td>Harrick Plasma</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">plastic mask</td>
			<td>Infinite Graphics</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
	</tbody>
</table>

microparticle manipulation by standing surface acoustic waves with dual-frequency excitations

Vi demonstrere en metode til at øge en stående overflade akustiske bølge (SSAW) tuning mulighed for mikropartikler manipulation i et lab-on-a-chip (LOC) system. Den samtidige excitation af den grundlæggende frekvens og dens tredje harmoniske, der er betegnet som dual-frekvens excitation, et par af håndfladens transducere (IDTs) kunne generere en ny type stående akustiske bølger i en mikrofluid kanal. Varierende magt og fasen i den dobbelt-frekvens excitation signaler resultater i en omkonfigurerbare felt af den akustiske stråling kraft af mikropartikler i hele microchannel (f.eks., antal og placering af trykket noder og den microparticle koncentrationer på de tilsvarende pres noder). Denne artikel viser, at motion tidspunktet for microparticle til kun én pres node kan reduceres ~ 2-fold på magtforholdene i den grundlæggende frekvens større end ~ 90%. I modsætning, der er tre pres noder i microchannel hvis mindre end denne tærskel. Desuden justere den indledende fase mellem den grundlæggende frekvens og de tredje harmoniske resultater i forskellige motion satser for de tre SSAW pres noder og i procentdelen af mikropartikler på hver pres node i microchannel. Der er en god aftale mellem den eksperimentelle observation og numeriske prognoser. Denne roman excitation metode kan let og ikke-invasivt integrere i LOC system, med en bred tenability og kun et par ændringer til den eksperimentelle set-up.

Fordelinger af det akustiske pres og den akustiske stråling kraft af en SSAW på den dobbelt-frekvens excitation (6,2 og 18.6 MHz) er vist i figur 1. Her, den dobbelt-frekvens excitation opstår på polystyren mikropartikler (4 µm i diameter) i en microchannel med en bredde på 300 µm ved en akustisk effekt af 146 mW. Den resulterende akustiske pres er altid i fase når P1 > 90% så at kun én pres node er til stede på y = 15...

Watch this Scientific Journal Video about Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations at JoVE.com

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

En protokol for at manipulere med mikropartikler i en mikrofluid kanal med en dobbelt-frekvens excitation præsenteres.

Microparticle Manipulation af stående overflade akustiske bølger med Dual-frekvens excitationer

We demonstrate a method for increasing the tuning ability of a standing surface acoustic wave (SSAW) for microparticles manipulation in a lab-on-a-chip ...

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