Tesis sobre el tema "Acoustophoresi"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 20 mejores tesis para su investigación sobre el tema "Acoustophoresi".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Toru, Sylvain. "Réalisation d'une pince acoustofluidique pour la manipulation de bioparticules". Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0028/document.
Texto completoIn lab-on-a-chip (LOC) technologies, many sample preparation steps are required before achieving a biological analysis on a single chip (sample introduction, concentration, mixing, purification, separation, etc.). The microsystem team of the Ampere Lab has studied for many years different contactless particle manipulation techniques, for sorting or manipulating bioparticles in LOC platforms, such as dielectrophoresis and magnetophoresis. In this thesis, we focus on acoustic manipulation of microparticles. This technique is advantageous for the manipulation of biological objects such as bacteria, because labelling and medium exchange can be avoided. We chose to work with surface acoustic waves (SAW), because this approach is consistent with the use of PDMS, widely used in microfluidics. Besides an easier microfluidic integration of the acoustic tweezers, the SAW technology provides an alternative to the existing devices with fixed acoustic traps, allowing a real time control of the trapped particles. This was experimentally achieved by playing on the phase shift between the two electrical signals driving the IDT, thereby modifying the position of nodes and antinodes of the resulting pressure wave. As a result, we could control in real time the position of a 3 μm latex bead or an E.coli bacteria alignment. We have also developed a finite-element model of the whole acoustofluidic chip allowing a better understanding of the physics and the optimization of the energy transfer between the electrical source and the trapped particle. Among different results, this model informs us that the magnitude of the acoustic radiation force varies by a factor of two with the phase shift between the electrical sources. This result seems to be validated by our last experiments
Björnander, Rahimi Klara. "Enrichment of microparticles in droplets using acoustophoresis". Thesis, Uppsala universitet, Mikrosystemteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-349376.
Texto completoFaridi, Muhammad Asim. "Bioparticle Manipulation using Acoustophoresis and Inertial Microfluidics". Doctoral thesis, KTH, Proteomik och nanobioteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200304.
Texto completoQC 20170124
Forss, Elin. "Evaluation of OSTE-hybrid materials for acoustophoresis applications". Thesis, KTH, Medicinteknik och hälsosystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277052.
Texto completoI detta projekt undersöktes ett nytt hybridmaterial för användning i applikationer inom akustofores. Akustofores kan användas till att manipulera partiklar inuti mikrofluidkkanaler genom att generera ståendevågor i kanalen med hjälpav ultraljud [1]. Detta kan användas till cellseparation [2] eller till att fånga partiklar [3]. Målet i detta projekt var att skapa material som skulle bli billigare och möjliggöra enklare fabricering av kanalerna som används inom akustofores än de material som traditionellt används, med bibehållande av tillräckliga akustiskaegenskaper. Detta genomfördes genom att undersöka om tillsättning av glaspärlor eller glasbubblor kunde förbättra de akustiska egenskaperna av en off-stoichiometry-thiol-enes (OSTE) baserad polymer. Hybridprover gjorda på OSTE-polymeren med olika volymandelar av glaspärloroch glasbubblor tillverkades och kategoriserades med avseende på deras akustiska egenskaper med hjälp av pulseeko buffertstång metoden. De akustiska egenskaperna som uppmättes var densitet, attenuering, akustisk impedans och reflektions koefficienten mellan vatten och materialet. Resultatet av projektet visade att tillsättning av glaspärlor ökade den akustiska impedansen i motsatts till glasbubblorna som visade sig minska den. Vidare visade det sig att både tillsättningen av glaspärlor och glasbubblor ökade attenueringen. Det hybridmaterial som visade sig ha de mest lämpliga akustiska egenskaperna var OSTE/glaspärlor med en 40% volymandel av glaspärlor. Den akustiska impedansen hade förhöjts med cirka 60% jämfört med vanlig OSTE. Därför valdes det hybrid-materialet till att tillverka en mikrofluidikkanal. Därefter genomfördes ett partikelfångstexperiment som visade att, OSTE/glaspärlor med en 40% volymandel av glaspärlor, kunde erhålla partikelfångst i kanalen. Detta innebär att en stående våg kunde genereras i kanalen och att den var tillräckligt stark för att kunna fånga partiklarna i mitten av kanalen. Däremot visade utvärdering av kanalens partikelfångsteffektivitet att den inte var lika effektiv som kanaler gjorda av traditionellt använda material. Därför rekommenderas framtida arbete till att designa en optimerad kanaldesign med OSTE/Glas-pärlor 40% materialets egenskaper i åtanke för att förhoppningsvis kunna öka partikelfångst effektivitet.
shahzad, mohd adnan faqui. "Microfluidic Chip development for acoustophoresis assisted selective cell sorting". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223658.
Texto completoKothapalli, Satya V. V. N. "Nano-Engineered Contrast Agents : Toward Multimodal Imaging and Acoustophoresis". Doctoral thesis, KTH, Medicinsk bildteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172397.
Texto completoQC 20150827
3MiCRON
Imani, Jajarmi Ramin. "Acoustic separation and electrostatic sampling of submicron particles suspended in air". Doctoral thesis, KTH, Strömningsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196857.
Texto completoQC 20161125
Leuthner, Moritz. "Improving cell secretome analysis and bacteria evolution by means of acoustophoresis". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285985.
Texto completoKjellman, Jacob. "Towards omnimaterial printing : Expanding the material palette of acoustophoretic printing". Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-251006.
Texto completoDroplet generation techniques are essential for industries such as the pharmaceutical, food industry, cosmetic industry, etc. However, traditional droplet generation techniques are limited in the palette of materials that can processed in a droplet form. For example, inkjet which is a well-established technology to generate droplets of high speed (1-10 kHz) and precision (10-20 μm), but can only eject fluids with low viscosities, roughly 10-100 folds the one of water. Acoustophoretic printing aims to overcome this material limitation and have successfully decoupled droplet ejection from ink viscosity. The method harnesses nonlinear acoustic forces to print a wide range of materials on demand, spanning over four orders of magnitudes (0.5 mPa·sto 25,000 mPa·s). However, the ejection is based on the formation of a pendant drop, and in the current prototype, the material palette of acoustophoretic printing is limited by nozzle wetting, limiting the allowable minimum surface tension to about 60 mN/m. In this work, a nozzle coating technique is introduced in order to expand the material window by processing fluid with a surface tension as low as 25 mN/m. By leveraging self-assembling of nanostructures on the nozzle tip, superamphiphobic coating is successfully manufactured by using a candle soot template.A robust manufacturing protocol has been established, and the coating characterized in its physics and performance.
Durand-Vidal, S. "Phenomenes de transports couples : acoustophorese et conductivite dans des solutions electrolytiques simples et micellaires". Paris 6, 1995. http://www.theses.fr/1995PA066308.
Texto completoSöderbäck, Per. "Micromachining of microfluidicsystems using a nanosecond laser : Process optimization and application". Thesis, Uppsala universitet, Mikrosystemteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-402248.
Texto completoDolatmoradi, Ata. "Thermally-Assisted Acoustofluidic Separation for Bioanalytical Applications". FIU Digital Commons, 2017. http://digitalcommons.fiu.edu/etd/3371.
Texto completoPeriyannan, Rajeswari Prem Kumar. "Droplet microfluidics for single cell and nucleic acid analysis". Doctoral thesis, KTH, Proteomik och nanobioteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192668.
Texto completoQC 20160926
Pialot, Baptiste. "Caractérisation ultrasonore intégrée pour traitement in-vitro du sang". Thesis, Sorbonne université, 2020. http://www.theses.fr/2020SORUS034.
Texto completoBlood transfusion is a major issue for medicine. To ensure the quality of blood products, reliable and safe blood fractionation techniques are required. Acoustophoresis separation is a recent microfluidic technique that exploits the ultrasonic radiation force to fractionate blood. During acoustophoresis, the stability of blood flow rate is essential. However, the development of a flowmeter adapted to blood acoustophoresis is not an easy task due to very low microfluidic flow rates. In addition, there is a need for new blood characterization techniques that would allow to monitor acoustophoresis. In particular, the blood hematocrit is an interesting parameter to measure that could help to assess red blood cells fractionation. In this PhD thesis, we present a simple Doppler ultrasound system that has been conceived to characterize the blood flow in an acoustostophoresis channel. We will first demonstrate how the system can be simply exploited with an optimization algorithm to measure blood flow rate in a range relevant to acoustophoresis. Then, we will apply some theoretical elements to evaluate the system capacity to measure the hematocrit of a diluted blood flow using ultrasonic backscattered power. Lastly, we will show how blood non-Newtonian behavior can be used to measure hematocrit in a physiological range through small variations of blood maximum velocity
Gourdin, Simon. "Description analytique des phénomènes acoustophorétiques, en solutions et suspensions". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066720/document.
Texto completoThis Ph.D. thesis is on the analytical description of acoustophoretic phenomena, in solutions and suspensions. Acoustophoresis is the creation of an electric field by an acoustic wave.First part is on electrolytic solutions, and it begins by a critical review of literature, from Debye first paper to a recent Ph.D. thesis on the same subject. Hypotheses are carefully selected, and a new model is deduced. This model, using pressure, friction, electric, inertia and corrective force, allows the prediction of acoustophoresis up to 0,3 molar for a simple salt, without any fitting parameter. An extension to solutions with three ionic species is done, and a Fortran program to compute the acoustophoresis as a function of the concentration is given in annex. Extension of the model, in the case of ionic liquid, allows the measurement of the volume of ions. A brief point is done on micellar and colloidal suspensions. A second part is on the application of non-equilibrium thermodynamic, especially Onsager reciprocal relation, to the acoustophoresis of suspensions. Acoustophoresis is shown to be proportional to the electric mobility, which allows the measurement of the latter in dark and concentrated suspensions. A link between acoustophoresis and the creation of acoustic wave by an electric field is also found, and a process to isolate contributions of colloids in real suspensions, with a supporting electrolyte, is proposed
Bisceglia, Émilie. "Méthodes physiques d’extraction de micro-organismes à partir d’échantillons sanguins à l'aide de microsystèmes". Thesis, Cachan, Ecole normale supérieure, 2013. http://www.theses.fr/2013DENS0042/document.
Texto completoExtraction of pathogens from a biological sample is a key step for efficient diagnostic tests of infectious diseases. For bloodstream infections, current diagnostic methods are usually based on bacterial growth and take several days to provide valuable information. An accelerated result would have a high medical value to adjust therapeutic strategies. The aim of this study is to design a new approach for separation and concentration of microorganisms directly from a blood sample, to avoid time-consuming growth stages. We report a method based on two different microsystems connected in series: it combines modification of conductivity and osmolarity of the sample with generic capture of microorganisms by dielectrophoresis. First we explore the impact of conductivity and osmolarity on the dielectric properties of blood cells and microorganisms. Dilution and acoustic forces are both analyzed to transfer blood cells and microorganisms to the optimized buffer. Then we demonstrate the feasibility of achieving the dielectrophoretic separation of microorganisms from blood cells in a low conductivity and low osmolarity medium inside a fluidic device. The structure of the device is optimized with numerical simulations and experiments performed on blood samples and various microorganisms (E. coli, S. epidermidis and C. albicans).The generic capture of microorganisms is validated, and we achieved a separation of 97% efficiency with E. coli, with an optimal inlet velocity around 100-200 µm.s-1. Finally, we propose an improved microsystem to perform the sample preparation step on a larger volume (1-10mL) in a few hours, in order to fit the medical need
Andrade, José Henrique Araújo Lopes de. "Acoustic radiation force and torque on suspended objects in an inviscid fluid". Universidade Federal de Alagoas, 2014. http://www.repositorio.ufal.br/handle/riufal/1694.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Recentes avanços e interesse em manipulação de partículas necessitam de uma maior compreensão teórica da força de radiação e torque acústico exercidos sobre uma configuração de múltiplas partículas. Nesta tese, nós estudamos teoricamente a força de radiação e torque acústico exercido por um feixe acústico arbitrário em um conjunto de partículas esféricas suspensas em um fluido não viscoso. O método baseia-se na expansão de ondas parciais (EOP) e no teorema translacional da adição para funções de onda esférica. A combinação do método de ondas parciais com o teorema da adição nos permitir resolver o problema de espalhamento mútiplo computando numericamente os coeficientes da expansão em um sistema de equações lineares. Por outro lado, quando consideramos a força e torque de radiação exercidos sobe uma única esfera, o teorema da adição tem a vantagem para resolver este problema exatamente. Após a obtenção dos coeficientes, a força e o torque de radiação são calculados usando um método em séries no campo distante. Para ilustrar o método, a força e o torque exercidos sobre uma ou multiplas esferas são analisados. Para o de uma única esfera, a força de radiação é gerada por um feixe de ultrassom focalizado. Para uma configuração de multiplas esferas, a força de radiação é induzida por ondas planas e estacionarias. Numa configuração específica de três gotas de azeite suspensas em água, com raios da ordem do comprimento de onda, verificou-se que as ondas reespalhadas produzem uma força de interação acústica, o que altera significativamente a força de radiação em cada gota em função da distância inter-gota. Além disso, verificou-se, pela primeira vez que um torque de interação acústico devido a uma distribuição espacial não simétrica da densidade de energia acústica para as gotas. Além disso, nosso estudo não tem restrições quanto ao tamanho esferas em comparação com o comprimento de onda, nem sobre a sua composição, que inclui rígida, líquida, elástica e sólidos viscoelásticos. Por fim, este estudo tem aplicações diretas sobre os métodos de manipulação de objetos sem contato por ondas acústicas, tais como a levitação acústica, pinças acústicas e acoustophoresis em dispositivos lab-on-a-chip.
Bisceglia, Émilie. "Méthodes physiques d'extraction de micro-organismes à partir d'échantillons sanguins à l'aide de microsystèmes". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00957785.
Texto completoJU, JENQ-AN y 朱政安. "Simulation Study of Plate Wave Acoustophoretic Devices". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/x34tb7.
Texto completo國立雲林科技大學
機械工程系
107
Abstract Nowadays, using the simulation software is more frequent. The physical quantity can be selected and also combination of many physical quantities that are different from each type. In order to emerge more complex and more diversified in accordance with actual situations. By analyzing of the experimental circuit is feasible or not? After a lot of data is sorted out, adjust and integration the data one by one. So that can clearly distinguish the difference in details. After the subsequent processing, the experimental steps can be started. After all, in the simulation, the detailed condition can be simulated from the 2D plane, and then extended to the 3D model, although it is more complicated but more perfect. The wave pattern selected this time is: "plate wave". The single particle in the substrate makes an elliptical motion. Each single particle must affect the thickness of the half plate to achieve the simplest characteristics of the plate wave, because if the wave energy is only transmitted on the surface, you can use the surface wave directly. Since the energy needs to be transmitted to the entire substrate, the paper explains the influence of energy transfer on different designs, and the difference is reflected in the data comparison. Therefore, the finger electrodes are set on both sides of the substrate as a function of stable energy transfer. The dispersion curves measured according to the substrate width of different widths are used for different wavelengths, and are used on the basis of subsequent designs, and then other physical quantities are added to simulate in layers to achieve experimentally consistent geometric settings. To compare between the physical quantities of the sound pressure frequency domain and the thermal sound field, the reason for selecting the thermal sound field is also because the results of the comparison between the use conditions and the consideration factors in the two physical quantities are performed, and the screening is adjusted by adjusting different items or It is to reduce the boundary conditions used, and the obtained data is adjusted to be the parameters required for the experiment. Keyword: Plate wave、Electromechanical coupling coefficient、Perturb method、microfluid particle trapping
Yu-FengPai y 白喻丰. "Study of Particle Focusing in Twin-Fluid Micro Acoustophoretic Sorters". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/45521309422725914108.
Texto completo國立成功大學
奈米科技暨微系統工程研究所
100
Previous studies on particle focusing using acoustic radiation force have mainly focused on separation within a single fluid that needs a subsequent procedure to re-dilute separated particles into other media for cellular analysis. In this study, a twin fluid micro-flow system is proposed for separating particles from its original solvent and rediluting them into another solvent simultaneously. In this micro-flow system, two different miscible solvents flow parallel to each other through a 2-inlet-2-outlet micro-channel, where an acoustic standing wave is set up. Due to the differences in acoustic properties of these solvents, the pressure node of the acoustic wave is shifted from the middle line of the channel. Under the action of the acoustic radiation force, particles with positive A -factors are extracted from their original solvent and re-suspended into the other solvent, wherein the pressure node resides.