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https://www.readbyqxmd.com/read/28443836/energy-harvesting-from-aperiodic-low-frequency-motion-using-reverse-electrowetting
#1
Tsung-Hsing Hsu, J A Taylor, T N Krupenkin
Mechanical energy harvesting can provide a promising alternative to electrochemical batteries, which are currently widely utilized to power mobile electronics. In this work we present a theoretical analysis of a recently proposed method of mechanical energy harvesting, which combines a reverse electrowetting phenomenon with the fast self-oscillating process of bubble growth and collapse. We investigate the details of the bubble dynamics and analyze the dependence of the energy generation process on the system parameters...
April 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28437684/fibrillar-disruption-by-ac-electric-field-induced-oscillation-a-case-study-with-human-serum-albumin
#2
Shubhatam Sen, Monojit Chakraborty, Snigdha Goley, Swagata Dasgupta, Sunando DasGupta
The effect of oscillation induced by a frequency-dependent alternating current (AC) electric field to dissociate preformed amyloid fibrils has been investigated. An electrowetting-on-dielectric type setup has been used to apply the AC field of varying frequencies on preformed fibrils of human serum albumin (HSA). The disintegration potency has been monitored by a combination of spectroscopic and microscopic techniques. The experimental results suggest that the frequency of the applied AC field plays a crucial role in the disruption of preformed HSA fibrils...
April 13, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28436527/electrowetting-on-conductors-anatomy-of-the-phenomenon
#3
Kontad Ounnunkad, Hollie V Patten, Matěj Velický, Anna K Farquhar, Paula A Brooksby, Alison J Downard, Robert A W Dryfe
We have recently reported that reversible electrowetting can be observed on the basal plane of graphite, without the presence of a dielectric layer, in both liquid/air and liquid/liquid configurations. The influence of carbon structure on the wetting phenomenon is investigated in more detail here. Specifically, it is shown that the adsorption of adventitious impurities on the graphite surface markedly suppresses the electrowetting response. Similarly, the use of pyrolysed carbon films, although exhibiting a roughness below the threshold previously identified as the barrier to wetting on basal plane graphite, does not give a noticeable electrowetting response, which leads us to conclude that specific interactions at the water-graphite interface as well as graphite crystallinity are responsible for the reversible response seen in the latter case...
April 24, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28431469/enhanced-response-time-of-electrowetting-lenses-with-shaped-input-voltage-functions
#4
Omkar D Supekar, Mo Zohrabi, Juliet T Gopinath, Victor M Bright
Adaptive optical lenses, based on the electrowetting principle, are being rapidly implemented in many applications such as microscopy, remote sensing, displays, and optical communication. To characterize the response of these electrowetting lenses, the dependence on DC driving voltage functions was investigated in a low viscosity liquid system. Cylindrical lenses with inner diameter 2.45 and 3.95-mm were used to characterize the dynamic behavior of the liquids under DC voltage electrowetting actuation. By increasing the rise time of the input exponential driving voltage, the originally underdamped system response can be damped, enabling a smooth response from the lens...
April 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28422343/e-maldi-optimized-conditions-during-electrowetting-enhanced-drop-drying-for-maldi-ms
#5
Olena Kudina, Huseyin Burak Eral, Frieder Mugele
We recently showed that electrowetting-enhanced sample preparation for MALDI-MS (eMALDI) can increase the intensity of the MALDI signal by 2-25 times compared to conventional drop drying by concentrating all the dried sample in a single spot rather than leaving behind a heterogeneous coffee stain pattern. Here, we demonstrate that the eMALDI signal enhancement can be further increased to more than 100x by systematically optimizing the electrowetting actuation frequency and amplitude. This enables 30x signal increase for a peptide standard...
April 18, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28422194/field-induced-anomalous-spreading-oscillation-ejection-spinning-and-breaking-of-oil-droplets-on-a-strongly-slipping-water-surface
#6
Sunny Kumar, Bhaskarjyoti Sarma, Ahsok Kumar Dasmahapatra, Amaresh Dalal, Dipankar Narayan Basu, Dipankar Bandyopadhyay
Application of an electric field on an oil droplet floating on the surface of a deionized water bath showed interesting motions such as spreading, oscillation, and ejection. The electric field was generated by connecting a pointed platinum cathode at the top of the oil droplet and a copper anode coated with polymer at the bottom of the water layer. The experimental setup mimicked a conventional electrowetting setup with the exception that the oil was spread on a soft and deformable water isolator. While at relatively lower field intensities we observed spreading of the droplet, at intermediate field intensities the droplet oscillated around the platinum cathode, before ejecting out at a speed as high as ∼5 body lengths per second at even stronger field intensities...
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28413333/equilibrium-shapes-of-a-heterogeneous-bubble-in-an-electric-field-a-variational-formulation-and-numerical-verifications
#7
Hanxiong Wang, Liping Liu, Dong Liu
The equilibrium shape of a bubble/droplet in an electric field is important for electrowetting over dielectrics (EWOD), electrohydrodynamic (EHD) enhancement for heat transfer and electro-deformation of a single biological cell among others. In this work, we develop a general variational formulation in account of electro-mechanical couplings. In the context of EHD, we identify the free energy functional and the associated energy minimization problem that determines the equilibrium shape of a bubble in an electric field...
March 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28390354/brownian-motion-as-a-new-probe-of-wettability
#8
Jianyong Mo, Akarsh Simha, Mark G Raizen
Understanding wettability is crucial for optimizing oil recovery, semiconductor manufacturing, pharmaceutical industry, and electrowetting. In this letter, we study the effects of wettability on Brownian motion. We consider the cases of a sphere in an unbounded fluid medium, as well as a sphere placed in the vicinity of a plane wall. For the first case, we show the effects of wettability on the statistical properties of the particles' motion, such as velocity autocorrelation, velocity, and thermal force power spectra over a large range of time scales...
April 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28300262/correction-electrowetting-without-external-voltage-using-paint-on-electrodes
#9
Collin B Eaker, Ishan D Joshipura, Logan R Maxwell, Jason Heikenfeld, Michael D Dickey
Correction for 'Electrowetting without external voltage using paint-on electrodes' by Collin B. Eaker et al., Lab Chip, 2017, DOI: .
March 16, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28264153/promotion-of-water-channels-for-enhanced-ion-transport-in-14-nm-diameter-carbon-nanotubes
#10
Jiadong Sheng, Qi Zhu, Xian Zeng, Zhaohui Yang, Xiaohua Zhang
Ion transport plays an important role in solar-to-electricity conversion, drug delivery, and a variety of biological processes. Carbon nanotube (CNT) is a promising material as an ion transporter in the applications of the mimicking of natural ion channels, desalination, and energy harvesting. Here, we demonstrate a unique, enhanced ion transport through a vertically aligned multiwall CNT membrane after the application of an electric potential across CNT membranes. Interestingly, electrowetting arising from the application of an electric potential is critical for the enhancement of overall ion transport rate through CNT membranes...
March 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28248522/interfacial-nanostructure-and-asymmetric-electrowetting-of-ionic-liquids
#11
Zhen Liu, Tong Cui, GuoZhu Li, Frank Endres
In this work, the interfacial nanostructure and electrowetting of ionic liquids having the same 1-ethyl-3-methylimidazolium cation ([EMIm](+)) but different anions such as bis(trifluoromethylsulfonyl)imide (TFSI(-)), trifluoromethylsulfonate (TfO(-)), methylsulfonate (OMs(-)), acetate (OAc(-)), bis(fluorosulfonyl)imide (FSI(-)), dicyanamide (DCA(-)), and tris(pentafluorethyl)trifluorphosphat (FAP(-)) on bare metallic electrodes were investigated. In the investigated voltammetric potential regime, the contact angle versus voltage curve is asymmetric with respect to surface polarity...
March 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28248385/effect-of-oil-on-an-electrowetting-lenticular-lens-and-related-optical-characteristics
#12
Dooseub Shin, Junoh Kim, Cheoljoong Kim, Gyo Hyun Koo, Jee Hoon Sim, Junsik Lee, Yong Hyub Won
While there are many ways to realize autostereoscopic 2D/3D switchable displays, the electrowetting lenticular lens is superior due to the high optical efficiency and short response time. In this paper, we propose a more stable electrowetting lenticular lens by controlling the quantity of oil. With a large amount of oil, the oil layer was broken and the lenticular lens was damaged at relatively low voltage. Therefore, controlling the amount of oil is crucial to obtain the required dioptric power with stability...
March 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28225124/electrowetting-without-external-voltage-using-paint-on-electrodes
#13
Collin B Eaker, Ishan D Joshipura, Logan R Maxwell, Jason Heikenfeld, Michael D Dickey
Electrowetting uses voltage to manipulate small volumes of fluid for applications including lab-on-a-chip and optical devices. To avoid electrochemical reactions, a dielectric often separates the fluid from the electrode, which has the undesired effect of adding processing steps while increasing the voltage necessary for electrowetting. We present a new method to dramatically reduce the complexity of electrode and dielectric fabrication while enabling multiple performance advances. This method relies on a self-oxidizing paint-on liquid-metal electrode that can be fabricated in minutes on rigid, rough, or even elastic substrates, enabling low operation voltages (<1 V), and self-healing upon dielectric breakdown...
March 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28217772/dielectrowetting-manipulation-for-digital-microfluidics-creating-transporting-splitting-and-merging-of-droplets
#14
Hongyao Geng, Jian Feng, Lisa Marie Stabryla, Sung Kwon Cho
Generating, splitting, transporting, and merging droplets are fundamental and critical unit operations for digital (droplet-based) microfluidics. State-of-the-art digital microfluidics performs such operations commonly using electrowetting-on-dielectric (EWOD) in the typical configuration of two parallel channel plates. This paper presents such operations using dielectrowetting (derived from liquid dielectrophoresis), not EWOD, with an array of interdigitated electrodes. The major and unique feature is that the present droplet manipulations are effective for conductive (water with/without surfactant) and non-conductive (propylene carbonate) fluids...
March 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28194461/a-3d-microblade-structure-for-precise-and-parallel-droplet-splitting-on-digital-microfluidic-chips
#15
Cheng Dong, Yanwei Jia, Jie Gao, Tianlan Chen, Pui-In Mak, Mang-I Vai, Rui P Martins
Existing digital microfluidic (DMF) chips exploit the electrowetting on dielectric (EWOD) force to perform droplet splitting. However, the current splitting methods are not flexible and the volume of the droplets suffers from a large variation. Herein, we propose a DMF chip featuring a 3D microblade structure to enhance the droplet-splitting performance. By exploiting the EWOD force for shaping and manipulating the mother droplet, we obtain an average dividing error of <2% in the volume of the daughter droplets for a number of fluids such as deionized water, DNA solutions and DNA-protein mixtures...
February 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28191268/automated-electrotransformation-of-escherichia-coli-on-a-digital-microfluidic-platform-using-bioactivated-magnetic-beads
#16
J A Moore, M Nemat-Gorgani, A C Madison, M A Sandahl, S Punnamaraju, A E Eckhardt, M G Pollack, F Vigneault, G M Church, R B Fair, M A Horowitz, P B Griffin
This paper reports on the use of a digital microfluidic platform to perform multiplex automated genetic engineering (MAGE) cycles on droplets containing Escherichia coli cells. Bioactivated magnetic beads were employed for cell binding, washing, and media exchange in the preparation of electrocompetent cells in the electrowetting-on-dieletric (EWoD) platform. On-cartridge electroporation was used to deliver oligonucleotides into the cells. In addition to the optimization of a magnetic bead-based benchtop protocol for generating and transforming electrocompetent E...
January 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28141923/voltage-gating-of-a-biomimetic-nanopore-electrowetting-of-a-hydrophobic-barrier
#17
Jemma L Trick, Chen Song, E Jayne Wallace, Mark S P Sansom
It is desirable that nanopores that are components of biosensors are gated, i.e., capable of controllable switching between closed (impermeable) and open (permeable) states. A central hydrophobic barrier within a nanopore may act as a voltage-dependent gate via electrowetting, i.e., changes in nanopore surface wettability by application of an electric field. We use "computational electrophysiology" simulations to demonstrate and characterize electrowetting of a biomimetic nanopore containing a hydrophobic gate...
February 6, 2017: ACS Nano
https://www.readbyqxmd.com/read/28059382/improving-the-performance-of-an-electrowetting-lenticular-lens-array-by-using-a-thin-polycarbonate-chamber
#18
Junsik Lee, Junoh Kim, Cheoljoong Kim, Dooseub Shin, Gyohyun Koo, Jee Hoon Sim, Yong Hyub Won
In this paper, we used a thin polycarbonate (PC) chamber to improve the performance of an electrowetting lenticular lens array. The polycarbonate chamber changed the radius of curvature (ROC) of the oil acting as a lens, which increased the dioptric power of the liquid lens to 1666.7D. The increase in dioptric power required a reduction in the distance between the optical center of the lens and the display pixels under the chamber, which was accomplished by reducing the thickness of the chamber. The optimal thickness of the chamber was determined to be 0...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28044289/digital-microfluidics-assisted-sealing-of-individual-magnetic-particles-in-femtoliter-sized-reaction-wells-for-single-molecule-detection
#19
Deborah Decrop, Elena Pérez Ruiz, Phalguni Tewari Kumar, Lisa Tripodi, Tadej Kokalj, Jeroen Lammertyn
Digital microfluidics has emerged in the last years as a promising liquid handling technology for a variety of applications. Here, we describe in detail how to build up an electrowetting-on-dielectric-based digital microfluidic chip with unique advantages for performing single-molecule detection. We illustrate how superparamagnetic particles can be printed with very high loading efficiency (over 98 %) and single-particle resolution in the microwell array patterned in the Teflon-AF(®) surface of the grounding plate of the chip...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27936801/insulating-material-requirements-for-low-power-consumption-electrowetting-based-liquid-lenses
#20
Stéphanie Chevalliot, Géraldine Malet, Herbert Keppner, Bruno Berge
Insulating materials from the parylene family were investigated for use in low-power-consumption electrowetting-based liquid lenses. It was shown that for DC-driven operations, parylene C leads to hysteresis, regardless of the presence of a hydrophobic top coat. This hysteresis was attributed to the non-negligible time needed to reach a stable contact angle, due to charge injection and finite conductivity of the material. It was further demonstrated that by using materials with better insulating properties, such as parylene HT and VT4, satisfactory results can be obtained under DC voltages, reaching a low contact angle hysteresis of below 0...
December 27, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
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