Rotational Diffusion of Monodisperse Liquid Crystal Droplets

Hsu, Paul S.; Poulin, Philippe; Weitz, David A.

doi:10.1006/jcis.1997.5223

Cited by 28 publications

(33 citation statements)

References 5 publications

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“…Emulsion droplets can be prepared by various techniques, such as photopolymerization [91], ultrasonication [92], shearing of droplets and subsequent crystallization fractionation [93, 94], droplet break-off in a co-flowing stream (microfluidics) [95], and dispersion polymerization [91, 96, 97]. However, the majority of these methods do not permit control over LC droplet size in the range that is optimal for LC sensing (1-10 μm, see below).…”

Section: Lc-in-water Emulsions As Sensorsmentioning

confidence: 99%

Chemical and biological sensing using liquid crystals

Carlton

Hunter

Miller

et al. 2013

Liquid Crystals Reviews

316

236

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The liquid crystalline state of matter arises from orientation-dependent, non-covalent interaction between molecules within condensed phases. Because the balance of intermolecular forces that underlies formation of liquid crystals is delicate, this state of matter can, in general, be easily perturbed by external stimuli (such as an electric field in a display). In this review, we present an overview of recent efforts that have focused on exploiting the responsiveness of liquid crystals as the basis of chemical and biological sensors. In this application of liquid crystals, the challenge is to design liquid crystalline systems that undergo changes in organization when perturbed by targeted chemical and biological species of interest. The approaches described below revolve around the design of interfaces that selectively bind targeted species, thus leading to surface-driven changes in the organization of the liquid crystals. Because liquid crystals possess anisotropic optical and dielectric properties, a range of different methods can be used to read out the changes in organization of liquid crystals that are caused by targeted chemical and biological species. This review focuses on principles for liquid crystal-based sensors that provide an optical output.

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Section: Lc-in-water Emulsions As Sensorsmentioning

confidence: 99%

Chemical and biological sensing using liquid crystals

Carlton

Hunter

Miller

et al. 2013

Liquid Crystals Reviews

316

236

View full text Add to dashboard Cite

show abstract

“…Liquid crystal (LC) droplets dispersed in aqueous solution are an interesting stimuli-responsive material [1]. They have been used as a model system for studying particle rotations [2] [3], optical momentum transfers [4], and optical vortex generations [5]. In recent years, LC droplets have also emerged as a unique optical probe for the detection of chemical and biological species and their reactions at the surface of the droplets [6].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Surfactants and Polyelectrolyte-Coated Liquid Crystal Droplets

Bera¹,

Fang²

2014

MSCE

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It is known that the adsorption of surfactants at the liquid crystal (LC)/aqueous interface can induce a bipolar-to-radial director configuration of LC droplets dispersed in aqueous solution. In this paper, we study the effect of charged polyelectrolyte-coating on the interaction of surfactants and LC droplet cores by observing the director configuration of the LC droplet cores as a function of surfactant concentrations. It is found that surfactants can penetrate into the polyelectrolyte coating and react with the LC droplet cores to induce the bipolar-to-radial transition of the LC inside the droplet cores. However, the concentration of charged surfactants required to induce the configuration transition of the LC droplet cores is affected by the charged polyelectrolyte coating. The effect is significantly enlarged with decreasing the alkyl chain length of charged surfactants. Our results highlight the possibility of engineering polyelectrolyte coatings to tune the interaction of LC droplets with analysts, which is critical towards designing LC droplet based sensors.

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“…Yet, to date, the significant limitation in the use of emulsions lies in that current production methods often yield droplets of broad size and/or with sizes typically larger than 2 mm. [15,16] Monodispersity and size are two important features of drug-loaded colloidal carriers: monodisperse systems permit the reliable and precise dosage of drugs, while carriers <1 mm in diameter avoid capillary blockage or filtration, leading to effective uptake by cells. This size range can also exploit the leaky nature of tumor blood vessels (380-780 nm), providing a means for uptake by cancer cells in vivo.…”

mentioning

confidence: 99%

Degradable, Surfactant‐Free, Monodisperse Polymer‐Encapsulated Emulsions as Anticancer Drug Carriers

et al. 2009

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Anticancer emulsions: Degradable, surfactant‐ free, micrometer‐ to sub‐micrometer‐sized polymer‐encapsulated emulsions loaded with lipophilic drugs (doxorubicin and 5‐fluorouracil) are prepared. In vitro drug‐release studies demonstrate controlled release under redox conditions and incubation with human colorectal cancer cells triggers cell death with greater efficiency (≈106 fold) than the free drug.

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Rotational Diffusion of Monodisperse Liquid Crystal Droplets

Cited by 28 publications

References 5 publications

Chemical and biological sensing using liquid crystals

Chemical and biological sensing using liquid crystals

Interaction of Surfactants and Polyelectrolyte-Coated Liquid Crystal Droplets

Degradable, Surfactant‐Free, Monodisperse Polymer‐Encapsulated Emulsions as Anticancer Drug Carriers

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