Hysteretic DC electrowetting by field-induced nano-structurations on polystyrene films

Sawane, Yogesh B.; Datar, Suwarna; Ogale, Satishchandra; Banpurkar, Arun

doi:10.1039/c5sm00007f

Cited by 6 publications

(6 citation statements)

References 48 publications

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“…In this method, the equilibrium shape of the pendent drop in the gravitational force was captured using charge-coupled device (CCD) camera and analyzed in real time using SCA 20 software. The axisymmetric pendant drop shape analysis was carried out by using Laplace-Young’s equation for determining the SFT values [29, 30].…”

Section: Methodsmentioning

confidence: 99%

“…The CMC is the point where an increase in the concentration of BS does not have any further reduction in SFT. In this technique, drop of liquid of different concentrations of BS, ranging from 1 to 60 mg/ml prepared in PBS was allowed to hang from the end of a capillary and the asymmetric shape of a pendant drop was determined by using Laplace-Young equation [29, 30] for measuring the value of SFT. The measurements of CA were made by using OCA Goniometer.…”

Section: Methodsmentioning

confidence: 99%

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Inhibition of pathogenic bacterial biofilms on PDMS based implants by L. acidophilus derived biosurfactant

Satpute

Mone

et al. 2019

BMC Microbiol

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Background Lactobacillus spp. predominantly shows its presence as a normal mucosal flora of the mouth and intestine. Therefore, the objective of our research is to investigate the in-vitro conditions for the prospective of medically valuable biosurfactants (BSs) derived from Lactobacillus spp. Biosurfactant (BS) obtained from Lactobacillus spp. exhibit antibiofilm and antiadhesive activity against broad range of microbes. In the present study we investigated the production, purification and properties of key components of the cell-associated-biosurfactant (CABS) from Lactobacillus acidophilus NCIM 2903. Results Extracted, purified, freeze-dried CABS shows reduction in surface tension (SFT) of phosphate buffer saline (PBS @pH 7.0) from 71 to 26 mN/m and had a critical micelle concentration (CMC) of 23.6 mg/mL. The CABS showed reduction in interfacial tension (IFT) against various hydrocarbons and had effective spreading capability as reflected through the decrease in contact angle (CA) on different surfaces (polydimethylsiloxane - PDMS, Teflon tape, glass surface, polystyrene film and OHP sheet). The anionic nature of CABS displayed stability at different pH and temperatures and formed stable emulsions. Thin layer chromatography (TLC) and Fourier transform infrared spectroscopy (FTIR) revealed CABS as glycolipoprotein type. The Sodium Dodecyl Sulphate Polyacrylamide Gel Electrophoresis (SDS-PAGE) showed presence of multiple bands in a molecular range of 14.4 to 60 kDa, with prominent bands of 45 kDa. The CABS has significant antiadhesion and antibiofilm activity against tested bacterial strains. Conclusion The current challenging situation is to develop methods or search for the molecules that will prevent the formations of biofilm on medical bioimplants of PDMS based materials. These findings are supportive for the use of Lactobacilli derived BS as potential antiadhesive agent on various surfaces of biomedical devices.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Inhibition of pathogenic bacterial biofilms on PDMS based implants by L. acidophilus derived biosurfactant

Satpute

Mone

et al. 2019

BMC Microbiol

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“…As electrical insulation is one of the stated advantages of our acidified siloxane, the dielectric properties of the 1.5 M HCl acidic siloxane were characterized and compared to the behavior of the regular siloxane. Because the regular siloxane is proven to be effective as the insulating fluid for electronics applications, including electrowetting, 29 the acidic siloxane should ideally show similar electrically insulating properties to be useful in this manner. It is also important to quantify these properties such that various electronic devices can at least be conceptually designed and theoretically modeled.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Oxide-Free Actuation of Gallium Liquid Metal Alloys Enabled by Novel Acidified Siloxane Oils

et al. 2016

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Electrowetting and electrocapillarity of liquid metals have a long history, and a recent explosion of renewed interest. Liquid metals have electromagnetic properties and surface tensions (>500 mN/m) that enable new forms of reconfigurable devices. However, the only nontoxic option, gallium alloys, suffer from immediate formation of a semirigid surface oxide. Although acids or electrochemical reduction can remove this oxide, these approaches surround the gallium alloy in a fluid that is also electrically conducting, diminishing electromagnetic effectiveness and precluding electrowetting actuation. Reported here are acidified siloxanes that remove and prevent oxide formation. Importantly, the siloxane oil associatively incorporates hydrochloric or hydrobromic acids, is electrically insulating, is chemically stable, removes etching byproducts (including water), and allows robust electrowetting. This work opens up new opportunities for liquid metal reconfiguration, and is of fundamental interest due to the unexpected chemical stability of the acidified siloxanes and their application to other materials and surfaces.

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“…The so-called electrowetting-on-dielectric (EWOD) phenomenon has been rapidly explored in recent years in both fundamental research and industrial applications. Spreading of droplets can be well controlled using the EWOD effect, making it an ideal tool to study contact-line dynamics including wetting, dewetting (Hong et al 2014;Vo & Tran 2018), contact angle hysteresis (Nelson, Sen & Kim 2011;Sawane et al 2015), droplet and soft-surfaces interactions (Dey et al 2019), as well as coalescence-induced jumping droplets (Boreyko & Chen 2009;Farokhirad, Morris & Lee 2015;Vahabi et al 2018). Moreover, EWOD has been emerging as a powerful technique in various industrial applications such as droplet manipulation (Fair et al 2001;Fair 2007;Pollack, Fair & Shenderov 2000), optical imaging systems (Berge & Peseux 2000;Kuiper & Hendriks 2004;Hao et al 2014;Lee, Park & Chung 2019), liquid deposition (Baret & Brinkmann 2006;Leïchlé, Tanguy & Nicu 2007) and energy harvesting systems (Moon et al 2013;Xu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Droplet jumping by modulated electrowetting

Vo,

Tran

2023

J. Fluid Mech.

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We investigate jumping of sessile droplets from a solid surface in ambient oil using modulated electrowetting actuation. We focus on the case in which the electrowetting effect is activated to cause droplet spreading and then deactivated exactly at the moment the droplet reaches its maximum deformation. By systematically varying the control parameters such as the droplet radius, liquid viscosity and applied voltage, we provide detailed characterisation of the resulting behaviours including a comprehensive phase diagram separating detachment from non-detachment behaviours, as well as how the detach velocity and detach time, i.e. duration leading to detachment, depend on the control parameters. We then construct a theoretical model predicting the detachment condition using energy conservation principles. We finally validate our theoretical analysis by experimental data obtained in the explored ranges of the control parameters.

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Hysteretic DC electrowetting by field-induced nano-structurations on polystyrene films

Cited by 6 publications

References 48 publications

Inhibition of pathogenic bacterial biofilms on PDMS based implants by L. acidophilus derived biosurfactant

Inhibition of pathogenic bacterial biofilms on PDMS based implants by L. acidophilus derived biosurfactant

Oxide-Free Actuation of Gallium Liquid Metal Alloys Enabled by Novel Acidified Siloxane Oils

Droplet jumping by modulated electrowetting

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