Aqueous droplet manipulation by optically induced Marangoni circulation

Hu, Wenqi; Ohta, Aaron T.

doi:10.1007/s10404-011-0797-2

Cited by 47 publications

(29 citation statements)

References 35 publications

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“…The local heating of the mineral oil results in toriodal Marangoni (theromocapillary) convection currents. 10, 18, 19 These currents are used to steer lipid-coated water droplets into contact and adhesion. A schematic showing the droplet motion is presented in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Droplet Shape Analysis and Permeability Studies in Droplet Lipid Bilayers

et al. 2012

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We apply optical manipulation to prepare lipid bilayers between pairs of water droplets immersed in an oil matrix. These droplet pairs have a well-defined geometry allowing use of droplet shape analysis to perform quantitative studies of the dynamics during the bilayer formation and to determine time-dependent values for the droplet volumes, bilayer radius, bilayer contact angle, and droplet centerline approach velocity. During bilayer formation, the contact angle rises steadily to an equilibrium value determined by the bilayer adhesion energy. When there is a salt concentration imbalance between the droplets, there is a measurable change in droplet volume. We present an analytical expression for this volume change and use this expression to calculate the bilayer permeability to water.

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Section: Methodsmentioning

confidence: 99%

Droplet Shape Analysis and Permeability Studies in Droplet Lipid Bilayers

et al. 2012

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“…(24), which includes the negative sign, is always negative, and the first term inside the brackets is always positive. Therefore, it is found that…”

Section: Thin-substrate Modelmentioning

confidence: 99%

“…Thermocapillary flow induced by irradiative heating has been applied to the control of convection patterns, 7 control of flow patterns near contact lines, [8][9][10][11] mixing in microdroplets, 12,13 laser surface texturing, [14][15][16] and manipulation of micro-objects. [17][18][19][20][21][22][23][24][25][26] Irradiative heating involves internal heat generation due to optical absorption in a medium. The absorption of light is generally described by the Bouguer-Lambert-Beer law, 27 which states that the radiation intensity in the medium attenuates exponentially with the distance from the surface facing the light source.…”

Section: Introductionmentioning

confidence: 99%

Thermocapillary instability of irradiated transparent liquid films on absorbing solid substrates

2013

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The thermocapillary instability of irradiated transparent liquid films on absorbing solid substrates is investigated by means of linear stability analysis. Under such circumstances, incident light passes through a film and is absorbed by the substrate, and the film is then heated by the heat influx across the interface with the substrate. The optical absorption in the substrate is affected by optical reflection. The energy reflectance varies periodically with the film thickness due to optical interference between light waves reflected from the gas-liquid and liquid-solid interfaces. The periodic variation of the reflectance strongly affects the film stability, which also varies periodically with the film thickness. Characteristic scales of the instability are also affected by the substrate thickness and incident light intensity. While qualitative aspects of the stability can be easily obtained from the analysis based on a simplified model that is derived under the thin-substrate assumption, the quantitative evaluation for the case of substrates of moderate to large thickness should be based on a more generalized model that allows for substrates of arbitrary thickness.

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“…Vincent et al showed high-speed sorting and 100% sorting efficiency for droplets moving at speed up to 1.3 cm/s in microfluidic devices [53]. Recently, Ohta et al have also reported droplet manipulation driven by the optothermal capillary effect on a light absorbing a-Si:H coated glass substrate using an optical projector [55,71].…”

Section: Optothermal Capillarymentioning

confidence: 99%

Light-Driven Droplet Manipulation Technologies for Lab-on-a-Chip Applications

Park

Chiou

2011

Advances in OptoElectronics

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Droplet-based (digital) microfluidics has been demonstrated in many lab-on-a-chip applications due to its free crosscontamination and no dispersion nature. Droplet manipulation mechanisms are versatile, and each has unique advantages and limitations. Recently, the idea of manipulating droplets with light beams either through optical forces or light-induced physical mechanisms has attracted some interests, since light can achieve 3D addressing, carry high energy density for high speed actuation, and be patterned and dynamically reconfigured to generate a large number of light beams for massively parallel manipulation. This paper reviews recent developments of various optical technologies for droplet manipulation and their applications in lab-on-achip.

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Aqueous droplet manipulation by optically induced Marangoni circulation

Cited by 47 publications

References 35 publications

Droplet Shape Analysis and Permeability Studies in Droplet Lipid Bilayers

Droplet Shape Analysis and Permeability Studies in Droplet Lipid Bilayers

Thermocapillary instability of irradiated transparent liquid films on absorbing solid substrates

Light-Driven Droplet Manipulation Technologies for Lab-on-a-Chip Applications

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