Whirl-enhanced continuous wave laser trapping of particles

Bartkiewicz, Stanisław; Miniewicz, Andrzej

doi:10.1039/c4cp04008b

Cited by 19 publications

(26 citation statements)

References 49 publications

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“…Let us consider a solution of an absorbing dye in a common organic solvent (here para-nitroaniline: C 6 H 6 N 2 O 2 in 1,4-dioxane: C 4 H 8 O 2 ) 33 . For the best results we used solutions of p-NA in 1,4-dioxane close to saturation at room temperature.…”

Section: Resultsmentioning

confidence: 99%

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Marangoni effect visualized in two-dimensions Optical tweezers for gas bubbles

Miniewicz

Bartkiewicz

Orlikowska

et al. 2016

Sci Rep

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In the report we demonstrate how, using laser light, effectively trap gas bubbles and transport them through a liquid phase to a desired destination by shifting the laser beam position. The physics underlying the effect is complex but quite general as it comes from the limited to two-dimension, well-known, Marangoni effect. The experimental microscope-based system consists of a thin layer of liquid placed between two glass plates containing a dye dissolved in a solvent and a laser light beam that is strongly absorbed by the dye. This point-like heat source locally changes surface tension of nearby liquid-air interface. Because of temperature gradients a photo-triggered Marangoni flows are induced leading to self-amplification of the effect and formation of large-scale whirls. The interface is bending toward beam position allowing formation of a gas bubble upon suitable beam steering. Using various techniques (employing luminescent particles or liquid crystals), we visualize liquid flows propelled by the tangential to interface forces. This helped us to understand the physics of the phenomenon and analyze accompanying effects leading to gas bubble trapping. The manipulation of sessile droplets moving on the glass surface induced via controlled with laser light interface bending (i.e. “droplet catapult”) is demonstrated as well.

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Section: Resultsmentioning

confidence: 99%

“… 32 reported generation of microbubbles at the interface of colloidal suspension and a plasmonic substrate via plasmon enhanced photothermal effect using single laser beam demonstrating patterned particle assemblies. Our recent reports were devoted to the physics of laser induced photonic whirls in absorbing liquids and phototropic liquid crystals 33 34 .…”

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confidence: 99%

Marangoni effect visualized in two-dimensions Optical tweezers for gas bubbles

Miniewicz

Bartkiewicz

Orlikowska

et al. 2016

Sci Rep

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“…16 However, these optical tweezing nucleation experiments were only shown to work on a liquid-gas interface. This strongly suggest that heating, evaporation, convection, and Marangoni effects play critical roles, 21 which would also explain why the method works in undersaturated solutions. These experiments also demonstrated polymorph selection.…”

Section: Introductionmentioning

confidence: 96%

Control over phase separation and nucleation using a optical-tweezing potential

Wynne

Walton

2018

Optical Trapping and Optical Micromanipulation XV

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Control over the nucleation of new phases is highly desirable but elusive. Even though there is a long history of crystallization engineering by varying physicochemical parameters, controlling which polymorph crystallizes or whether a molecule crystallizes or forms an amorphous precipitate is still a black art. Although there are now numerous examples of control using laser-induced nucleation, a physical understanding is absent and preventing progress. We will show that concentration fluctuations in the neighborhood of a liquid-liquid critical point can be harnessed by an optical-tweezing potential to induce concentration gradients. A simple theoretical model shows that the stored electromagnetic energy of the laser beam produces a free-energy potential that forces phase separation or triggers the nucleation of a new phase. Experiments in liquid mixtures using a low-power laser diode confirm the effect. Phase separation and nucleation through an optical-tweezing potential explains the physics behind non-photochemical laser-induced nucleation and suggests new ways of manipulating matter.

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“…16 However, these optical tweezing nucleation experiments were only shown to work on a liquid-gas interface. This strongly suggests that heating, evaporation, convection, and Marangoni effects play critical roles, 21 which would also explain why the method works in under-saturated solutions. However, very excitingly, these experiments also demonstrated polymorph selection.…”

Section: Introductionmentioning

confidence: 99%