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PubMed Journals Articles About "Using Waves Move Droplets" RSS

16:54 EDT 16th July 2019 | BioPortfolio

Using Waves Move Droplets PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Using Waves Move Droplets articles that have been published worldwide.

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Showing "Using waves move droplets" PubMed Articles 1–25 of 1,200+

Vapor-induced motion of two pure liquid droplets.

The movement of evaporating liquid droplets on a surface can be triggered by the Marangoni effect arising from heterogeneities in the surface tension or a gradient in the surface energy of the substrate. Here, we show that, on a high energy surface that remains uniform, the motion of two pure liquid droplets can be induced by a gradient in the liquid vapor resulting from evaporation. The droplets always attract each other, moving from the high evaporation side to the low evaporation side, to reduce energy d...


Controlling self-assembly and buckling in nano fluid droplets through vapour mediated interaction of adjacent droplets.

Sessile droplets of contrasting volatilities can communicate via long range (∼O (1) mm) vapour-mediated interactions which allow the remote control of the flow driven self-assembly of nanoparticles in the drop of lower volatility. This allows morphological control of the buckling instability observed in evaporating nanofluid droplets.

Fluorescent nucleic acid probe in droplets for bacterial sorting (FNAP-sort) as a high-throughput screening method for environmental bacteria with various growth rates.

We have developed a new method for selectively sorting droplets containing growing bacteria using a fluorescence resonance energy transfer (FRET)-based RNA probe. Bacteria and the FRET-based RNA probe are encapsulated into nanoliter-scale droplets, which are incubated to allow for cell growth. The FRET-based RNA probe is cleaved by RNase derived from the bacteria propagated in the droplets, resulting in an increase in fluorescence intensity. The fluorescent droplets containing growing bacteria are distingui...


Sorting by interfacial tension (SIFT): label-free selection of live cells based on single-cell metabolism.

Selection of live cells from a population is critical in many biological studies and biotechnologies. We present here a novel droplet microfluidic approach that allows for label-free and passive selection of live cells using the glycolytic activity of individual cells. It was observed that with the use of a specific surfactant utilized to stabilize droplet formation, the interfacial tension of droplets was very sensitive to pH. After incubation, cellular lactate release results in droplets containing a live...

Enhanced mixing of binary droplets induced by capillary pressure.

The mixing of binary droplets is of paramount importance in microfluidic systems. In order to reveal the mixing mechanism of two free droplets suspended in the immiscible phase, we have developed a novel experimental setup to study the internal mixing in coalescing droplets with varying interfacial tension differences and droplet sizes. It is confirmed that the interfacial energy of droplets supports the jet flow and liquid bridge expansion during the coalescence of droplets. The increase of interfacial ten...

Velocity Saturation in Digital Microfluidics.

In digital microfluidics, discrete droplets of fluid are made to move on an open surface with no microchannels. These systems are commonly operated by application of electrical driving forces to an array of electrodes. While these driving forces are well characterized, the dissipative forces opposing droplet movement have not been as thoroughly examined. In recognition of this deficit, we used force-velocity plots to characterize droplet movement in digital microfluidics, which was found to be consistent wi...

Hydrophobic ion-pairs and lipid-based nanocarrier systems: The perfect match for delivery of BCS class 3 drugs.

Membrane permeability of charged BCS class 3 drugs can be tremendously improved by the formation of hydrophobic ion-pairs (HIPs), as the lipophilic character of the drug is strongly improved so that it can move across the phospholipid bilayer of epithelial cells. This effect, however, can in most cases only be observed in in vitro studies, where the destabilizing effect of endogenous counterions on HIPs can be minimized. In vivo results were so far disappointing. Due to the incorporation of HIPs in lipid-ba...

Self-faceting of emulsion droplets as a route to solid icosahedra and other polyhedra.

Temperature-controlled self-faceting of liquid droplets has been recently discovered in surfactant-stabilized alkane-in-water emulsions. We hypothesize that similar self-faceting may occur in emulsion droplets of UV-polymerizable linear hydrocarbons. We further hypothesize that the faceted droplet shapes can be fixed by UV-initiated polymerization, thus providing a new route towards the production of solid polyhedra.

Release of a trapped droplet in a single micro pore throat.

The critical condition (i.e., critical capillary number Ca) for the release of trapped droplets is of practical importance in enhanced oil recovery and droplet microfluidics. In a recent study, Ca was obtained for a long droplet with a size much larger than the channel size. However, in real applications, trapped droplets are often finite with a size comparable to the channel, in which capillary and hydrostatic pressures alternate significantly. We hypothesize that Ca of finite droplets has a discrepancy fr...

Müller Glial Cells Participate in Retinal Waves via Glutamate Transporters and AMPA Receptors.

Retinal waves, the spontaneous patterned neural activities propagating among developing retinal ganglion cells (RGCs), instruct the activity-dependent refinement of visuotopic maps. Although it is known that the wave is initiated successively by amacrine cells and bipolar cells, the behavior and function of glia in retinal waves remain unclear. Using multiple in vivo methods in larval zebrafish, we found that Müller glial cells (MGCs) display wave-like spontaneous activities, which start at MGC processes ...

Out of Africa by spontaneous migration waves.

Hominin evolution is characterized by progressive regional differentiation, as well as migration waves, leading to anatomically modern humans that are assumed to have emerged in Africa and spread over the whole world. Why or whether Africa was the source region of modern humans and what caused their spread remains subject of ongoing debate. We present a spatially explicit, stochastic numerical model that includes ongoing mutations, demic diffusion, assortative mating and migration waves. Diffusion and assor...

Orb weaver glycoprotein is a smart biological material, capable of repeated adhesion cycles.

Orb weavers produce webs that trap prey using a capture spiral formed of regularly spaced glue droplets supported by protein fibers. Each droplet consists of an outer aqueous layer and an adhesive, viscoelastic glycoprotein core. Organic and inorganic compounds in the aqueous layer make droplets hygroscopic and cause droplet features to change with environmental humidity. When droplets contact a surface, they adhere and extend as an insect struggles. Thus, a droplet's extensibility is as important for prey ...

Selective infarct zone imaging with intravenous acoustically activated droplets.

Microbubbles (MB) can be compressed to nanometer-sized droplets and reactivated with diagnostic ultrasound; these reactivated MB possess unique imaging characteristics.

Highly Flexible and Ultra-Precise Manipulation of Light Levitated Femtolitre/Picolitre Droplets.

The ultra-precise manipulation of the droplets at the microscale is a promising paradigm for broad implications in reagent transport and element analysis but the existing strategies still suffer from the cross-contamination or the miscellaneous auxiliaries. Inspired by the levitation, we develop a method for excellently manipulating levitated femtolitre/picolitre droplets by a single focused laser. We show that the unique light-induced vapor flow in association with the interface morphology is responsible f...

Droplets Capped with an Elastic Film Can Be Round, Elliptical, or Nearly Square.

We present experiments that show that the partial wetting of droplets capped by taut elastic films is highly tunable. Adjusting the tension allows the contact angle and droplet morphology to be controlled. By exploiting these elastic boundaries, droplets can be made elliptical, with an adjustable aspect ratio, and can even be transformed into a nearly square shape. This system can be used to create tunable liquid lenses and, moreover, presents a unique approach to liquid patterning.

Oil-in-water fL droplets by interfacial spontaneous fragmentation and their electrical characterization.

Inkjet printing is here employed for the first time as a method to produce femtoliter (fL) scale oil droplets dispersed in water. In particular, picoliter (pL) scale fluorinated oil (FC40) droplets are printed in presence of perfluoro-1-octanol (PFCO) surfactant at velocity higher than 5 m/s. Femtoliter scale oil droplets in water are spontaneously formed through a fragmentation process at the water/air interface by using minute amounts of non-ionic surfactant (down to 0.003% v/v of Tween 80). This fragment...

Precise morphology control and fast merging of a complex multi-emulsion system: the effects of AC electric fields.

We showed that an AC electric field can be effectively used to control the full morphology of a multi-emulsion system (oil/water/oil, O/W/O and water/oil/water, W/O/W); specifically, the size of outer droplets and the number of inner droplets (from 5 to 0) could be controlled. In our system, such control was achieved by adopting non-contact type of electrodes together with double-flow-focusing geometry to apply an AC electric field during the formation of complex droplets. As such, the AC electric field cou...

Single-Cell RNA Sequencing with Drop-Seq.

Drop-Seq is a low-cost, high-throughput platform to profile thousands of cells by encapsualting them into individual droplets. Uniquely barcoded mRNA capture microparticles and cells are coconfined through a microfluidic device within the droplets where they undergo cell lysis and RNA hybridiztion. After breaking the droplets and pooling the hybridized particles, reverse transcription, PCR, and sequencing in single reactions allow to generate data from thousands of single-cell transcriptomes while maintaini...

Breaking the Symmetry of Momentum Conservation Using Evanescent Acoustic Fields.

Although the conservation of momentum is a fundamental law in physics, its constraints are not fulfilled for wave propagation at material boundaries, where incident waves give rise to evanescent field distributions. While nonlinear susceptibility tensor terms can provide solutions in the optical regime, this framework cannot be applied directly to acoustic waves. Now, by considering a complete representation of wave interactions and scattering at boundaries, we are able to show a generic formalism of sum-fr...

A closed-form solution to propagation of guided waves in a layered half-space under a time-harmonic load: An application of elastodynamic reciprocity.

This article is concerned with the application of reciprocity in computing guided wave motions generated by a time-harmonic load in a layer of uniform thickness joined to a half-space. Explicit expressions for free Rayleigh waves and Love waves propagating in the layered half-space are introduced. Exact solutions of Rayleigh waves and Love waves are derived from reciprocity relations between an actual state - guided waves generated by a time-harmonic line load and a virtual state - an appropriately chosen f...

Titration of Aerosol pH Through Droplet Coalescence.

The pH of aqueous aerosols, as well as cloud and fog droplets, has an important influence on the chemistry that takes place within these unique microenvironments. Utilizing conjugate acid/base pairs to infer pH changes, we investigate, for the first time, changes in aerosol pH upon droplet coalescence. In particular, we show that the pH within individual aqueous aerosol droplets that are ~8 μm in diameter can be titrated via droplet coalescence in an Aerosol Optical Tweezer (AOT). Using sulfate/bisulfate a...

Spin-Wave Amplification and Lasing Driven by Inhomogeneous Spin-Transfer Torques.

We show that an inhomogeneity in the spin-transfer torques in a metallic ferromagnet under suitable conditions strongly amplifies incoming spin waves. Moreover, at nonzero temperatures the incoming thermally occupied spin waves will be amplified such that the region with inhomogeneous spin-transfer torques emits spin waves spontaneously, thus constituting a spin-wave laser. We determine the spin-wave scattering amplitudes for a simplified model and setup, and show under which conditions the amplification an...

Droplet barcoding: tracking mobile micro-reactors for high-throughput biology.

Droplet microfluidics has become a powerful analytical platform in biological research for conducting high-throughput screening in millions of discrete micro-reactors per hour. While the method facilitates faster and cheaper testing than conventional microtiter plates, the mobile nature of droplets makes micro-reaction tracking a notable challenge. To address this, researchers are developing a variety of tracking methods, ranging from organizing droplets into an index or labeling droplets with a barcode. Th...

The Rise of Ultrafast Waves.

Traditionally, biochemical traveling waves are thought to propagate due to a coupling of bistable reactions with diffusion. Recent work proposes mechanisms by which cells achieve fast signaling without necessarily resorting to pure bistability or diffusion-mediated coupling.

A Quantization Scheme for the Experiments with ''Walking Droplets''.

In this paper we explore the interest and feasibility of quantizing the macroscopic surface wave generated in the dynamics of walking droplets on a vertically vibrated liquid surface in the limit of high memory of the droplet trajectory, where an astonishing similarity with the quantum behavior has been experimentally observed.


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