Laser‐Induced Nanodroplet Injection and Reconfigurable Double Emulsions with Designed Inner Structures

Guo, Jinkun; Hong, Seung‐Ho; Yoon, Hyun‐Jin; Babakhanova, Greta; Lavrentovich, Oleg D.

doi:10.1002/advs.201900785

Cited by 22 publications

(23 citation statements)

References 39 publications

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“…In bright-field images very small droplets can be observed within the LC droplets. This is a phenomenon previously reported − (Figure a). For droplets with a bipolar director field (planar alignment) a more complex image is observed (Figures d and c).…”

Section: Results and Discussionsupporting

confidence: 83%

Control of Director Fields in Phospholipid-Coated Liquid Crystal Droplets

et al. 2020

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In liquid crystal (LC) droplets, small changes in surface anchoring energy can produce large changes in the director field which result in readily detectable optical effects. This makes them attractive for use as biosensors. Coating LC droplets with a phospholipid monolayer provides a bridge between the hydrophobic world of LCs and the water-based world of biology and makes it possible to incorporate naturally occurring biosensor systems. However, phospholipids promote strong perpendicular (homeotropic) anchoring that can inhibit switching of the director field. We show that the tendency for phospholipid layers to promote perpendicular anchoring can be suppressed by using synthetic phospholipids in which the acyl chains are terminated with bulky tert-butyl or ferrocenyl groups; the larger these end-group(s), the less likely the system is to be perpendicular/radial. Additionally, the droplet director field is found to be dependent on the nature of the LC, particularly its intrinsic surface properties, but not (apparently) on the sign of the dielectric anisotropy, the proximity to the melting/isotropic phase transition, the surface tension (in air), or the values of the Frank elastic constants.

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Section: Results and Discussionsupporting

confidence: 83%

Control of Director Fields in Phospholipid-Coated Liquid Crystal Droplets

et al. 2020

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“…Furthermore, when droplets are produced by agitating a mixture of the LC and a solution of the surfactant, this not only produces an emulsion of LC in water but also an emulsion of water in LC; the LC droplets contain inclusions of small droplets of water that can affect their properties. 22,49,50…”

Section: Resultsmentioning

confidence: 99%

Chiral nematic liquid crystal droplets as a basis for sensor systems

Paterson

Bao

et al. 2022

Mol. Syst. Des. Eng.

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“…2b). The details for the Laser-assisted mechanical injection have been discussed in our previous study [1][2]. A plausible scenario of injection is illustrated in Fig.…”

Section: Methodsmentioning

confidence: 99%

Laser micro-nano manufacturing technology for liquid crystal microdroplets with diverse inner structures

Guo

Ling²,

Yuan³

et al. 2023

Advanced Optical Manufacturing Technologies and Applications 2022; And 2nd International Forum of Young Scientists on Advanced

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The macroscopic property of optical material depends on the chemical composition as well as its mesoscopic structure. Thus, the processing of micro-and nanostructures of soft matter, including liquid crystal, is of great importance and can be exploited in many areas. The laser-assisted mechanical injection brings the concept of laser micro-nano manufacturing to the field of liquid crystal (LC) and injects a certain number of microdroplets (MDs) of the water solution with a uniform size into a host LC drop by using a laser beam. With the help of the elasticity of the LC medium, the injected water MDs spontaneously self-assemble into colloidal crystals as inner structures within the closed 3D space of the host LC drop in the microscale. The self-assembly structure of injected MDs in 3D has been scanned using the confocal microscope. In addition, by introducing the cholesteric LC drops with a topological defect line as the host, the injected MDs are captured by the defect line and self-assembled along its geometry into a chain. Moreover, it is proved that laser-assisted mechanical injection is also available for the interface of two immiscible fluids with a relatively high viscosity. The results provide a new method for fabricating and developing customized hierarchical microemulsion, drug delivery system, biosensor, and functionalized microstructure of soft matter.

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Laser‐Induced Nanodroplet Injection and Reconfigurable Double Emulsions with Designed Inner Structures

Cited by 22 publications

References 39 publications

Control of Director Fields in Phospholipid-Coated Liquid Crystal Droplets

Control of Director Fields in Phospholipid-Coated Liquid Crystal Droplets

Chiral nematic liquid crystal droplets as a basis for sensor systems

Laser micro-nano manufacturing technology for liquid crystal microdroplets with diverse inner structures

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