Active surfaces: Ferrofluid-impregnated surfaces for active manipulation of droplets

Khalil, Karim S.; Mahmoudi, Seyed Reza; Abu-Dheir, Numan; Varanasi, Kripa K.

doi:10.1063/1.4891439

Cited by 105 publications

(93 citation statements)

References 57 publications

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“…This concept may prove useful in creating functional droplet networks that can be used for applications such as detecting airborne or exhaled compounds. Other researchers have created patterned IL layers for controlling droplet mobility, 23 have manipulated droplets using ILs impregnated with magnetic nanoparticles, 58 and have transferred magnetically doped droplets between IL layers using magnets. 59 Still others have manipulated droplets using IL layers fabricated on fluorinated paper, 60 which could aid in the development of low-cost, paper-based diagnostics.…”

Section: Diagnosticsmentioning

confidence: 99%

Immobilized liquid layers: A new approach to anti-adhesion surfaces for medical applications

Sotiri

Overton

Waterhouse³

et al. 2016

Exp Biol Med (Maywood)

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Surface fouling and undesired adhesion are nearly ubiquitous problems in the medical field, complicating everything from surgeries to routine daily care of patients. Recently, the concept of immobilized liquid (IL) interfaces has been gaining attention as a highly versatile new approach to antifouling, with a wide variety of promising applications in medicine. Here, we review the general concepts behind IL layers and discuss the fabrication strategies on medically relevant materials developed so far. We also summarize the most important findings to date on applications of potential interest to the medical community, including the use of these surfaces as anti-thrombogenic and anti-bacterial materials, anti-adhesive textiles, high-performance coatings for optics, and as unique platforms for diagnostics. Although the full potential and pitfalls of IL layers in medicine are just beginning to be explored, we believe that this approach to anti-adhesive surfaces will prove broadly useful for medical applications in the future.

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Section: Diagnosticsmentioning

confidence: 99%

Immobilized liquid layers: A new approach to anti-adhesion surfaces for medical applications

Sotiri

Overton

Waterhouse³

et al. 2016

Exp Biol Med (Maywood)

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“…Khalil et al fabricated a lubricant ferrofluid-impregnated textured solid surface with low friction and hysteresis. [77] This surface could be used to manipulate lots of different liquids and even solid particles under a nonuniform magnetic field. Recently, we proposed a strategy to achieve a fast magnetoresponsive smart interface for controllable liquid transport by integrating a magnetic fluid into a nanoarray (i.e., a magnetoresponsive liquid/solid composite interface) (Figure 6).…”

Section: Magnetoresponsive Composite Interfacesmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

102

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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“…This influences the activation barrier for nucleation to occur on the surface, with an impregnating lubricant with a low surface tension resulting in a high activation barrier and vice versa. Micro-textured surfaces have a critical contact angle below which the lubricating liquid can impregnate the texture and remain held by the capillary forces [140]. It can be calculated using the Equation 2 below: (6) The equation calculates the critical contact angle using the fraction of projected area of the textured surface that is occupied by the solid (Φ) and the ratio of total surface area of the textured surface to its projected area (r) [140].…”

Section: Modified Dlcmentioning

confidence: 99%

Design of intelligent surfaces for energy intensive processing industry

2018

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Abstract.There are three different factors that can affect adhesion: the process fluid, the processing conditions and the surface of the processing equipment. Of these three factors, the surface properties of the processing equipment are the factor that offers the greatest opportunity for manipulation. The two key surface properties that have been identified to reduce adhesion are the surface energy and the surface topography. The surface energy of a material determines its degree of wettability and, a surface's affinity for water. In previous studies the surface energy of materials have been leveraged in order to create a surface with reduced levels of fouling through surface modification or the addition of polymer coatings with varying degrees of hydrophobicity. In addition, the topography of surfaces has been modified to reduce the level of particle adhesion. These modifications involve creating either a structured or random porous microstructure on the surface. Additional methods identified to reduce fouling include the application of liquid infused porous surfaces at low shear conditions and the use of non-contact heating through techniques such as microwave processing.

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Active surfaces: Ferrofluid-impregnated surfaces for active manipulation of droplets

Cited by 105 publications

References 57 publications

Immobilized liquid layers: A new approach to anti-adhesion surfaces for medical applications

Immobilized liquid layers: A new approach to anti-adhesion surfaces for medical applications

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Design of intelligent surfaces for energy intensive processing industry

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