Polymethyl methacrylate (PMMA)/fluoropolymer bilayer: a promising dielectric for electrowetting applications

Yedewar, Pranjali; Wadhai, Sandip M.; Sawane, Yogesh B.; Banpurkar, Arun

doi:10.1007/s10853-022-07235-3

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…To further reduce the leakage current, a fluoropolymer (Hyflon) was coated on top of CTP, even though the dielectric constant of the double layer was calculated to be 3.14 for double-layer structure, the opening ratio was slightly larger (60%) than single-layer device (Figure 14c,d). 65 The smaller opening ratio of the single-layer CTP device was properly due to the less hydrophobicity of CTP and the impact of the fabrication process. The response time for both types of devices was approximately 20 ms (Figure S11).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays

Guo,

et al. 2023

ACS Appl. Mater. Interfaces

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Cyclic tetrasiloxane polymer (CTP) has recently garnered interest as a hydrophobic material with unique properties. This study aims to enhance the dielectric constant of CTP films by introducing excess Si−H groups and to explore the impact of synthesis and processing conditions on the resulting properties. The film demonstrates high hydrophobicity, with contact angles of 107°in air and 165°in n-decane, along with a notable dielectric constant of 5.1°. Furthermore, the CTP film displays reversible electrowetting behavior with low contact angle hysteresis (2°) and possesses good transparency (∼99%) and thermal stability. As such, the CTP film has significant potential as a material for the electric wetting of hydrophobic dielectric layers and may serve as a promising alternative in electrowetting applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays

Guo,

et al. 2023

ACS Appl. Mater. Interfaces

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“…Among these properties, one should mention their reasonable resistance to chemicals, high impact strength, lightness, high resistance to sunshine and weather exposure, shatter and scratch resistances, good thermal resistance, compatibility with human tissue, wide range of glass transition temperature, etc. [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

TG/DSC/FTIR/QMS analysis of environmentally friendly poly(citronellyl methacrylate)-co-poly(benzyl methacrylate) copolymers

Worzakowska

2023

J Mater Sci

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Polymer materials, not described in the literature so far, were obtained in the process of UV polymerization between methacrylic monomer obtained on the basis of natural, terpene alcohol: citronellyl methacrylate and benzyl methacrylate with different composition. The structures of the novel, environmentally friendly copolymers were confirmed by the FTIR and 13C CPMAS/NMR spectra. The copolymers containing more than 50% mass of citronellyl methacrylate were characterized by a high conversion of the double bonds determined on the basis of the FTIR and NMR spectra (95–96% and 92–94%, respectively). The novel materials were highly resistant to polar and non-polar solvents and the chemical stability. The glass transition temperature was from 15.8 to 19.9 °C which confirms that the obtained materials are elastomers at room temperature. Their thermal stability depended on their composition. It was from 185 to 205 °C (inert conditions) and from 149 to 214 °C (oxidizing conditions). TG/FTIR/QMS studies confirmed that their decomposition took place mainly as a depolymerization process combined with a subsequent breaking of the bonds in the resulting monomer/s at higher temperatures, which led to the formation of the gases with lower molecular masses. The main decomposition products emitted in an inert atmosphere were benzyl methacrylate, citronellyl methacrylate, 2-methylpropenal, citronellal and higher molecular mass compounds formed as a result of radical reactions between intermediate volatile products. In turn, under oxidizing conditions, as volatiles, benzyl methacrylate, citronellyl methacrylate, 2-methylpropenal, citronellal and small amounts of inorganic gases (CO, CO2, H2O) as a result of depolymerization and some combustion processes of the residues were indicated.

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“…For the device dielectric component, commonly used materials such as Parylene-C and Teflon™ AF are expensive while others, for example, silicon dioxide and aluminium oxide, require clean-room facilities and elaborate processes [8], [10]- [11]. Dielectric materials with superior dielectric constant such as 123 aluminium oxide (9.5) [12] and tantalum pentoxide (20)(21)(22)(23)(24)(25) [13]- [14] possess the same challenge of requiring deposition techniques that are expensive and time consuming.…”

Section: Introductionmentioning

confidence: 99%

“…These materials however pose another challenge which is the formation of pinholes in the layer [11]. Other unconventional materials for EWOD dielectric component that have been demonstrated are: ion gel [11], PMMA/fluoropolymer bilayer [21] and cyanoethyl pullulan [22]. All these alternative materials employed easy deposition techniques such as spin coating and roll coating.…”

Section: Introductionmentioning

confidence: 99%

Low-cost Polyurethane Coating as Dielectric Component in Digital Microfluidics

Latip¹,

Coudron²,

Tracey³

2023

JMechE

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Digital microfluidics (DMF) as a platform for precise handling of liquid droplets is a powerful tool but the affordability of the device has been one of the hindrances to its wide implementation. This paper reports the development of DMF devices using low-cost materials and simple deposition techniques specifically for the device dielectric component. Three commercial polyurethane coatings were investigated for their feasibility as the dielectric layer. The electrowetting behaviour of these materials was investigated by evaluating the change in contact angle with applied voltage of a water droplet sitting on the dielectric samples prepared using easy deposition methods such as spraying and spin coating. Devices were then fabricated using these materials to evaluate their capability to actuate droplets. Five types of polyurethane dielectric sample exhibited contact angle reversibility with hysteresis ranging between 4° to 25° after 250 VDC application. Droplet transportation back and forth across 8 electrodes at 180 VRMS has been demonstrated in a device made of one of the polyurethane coatings using a spraying technique. This result implies the potential of using polyurethane for future development of low-cost and disposable DMF devices.

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Polymethyl methacrylate (PMMA)/fluoropolymer bilayer: a promising dielectric for electrowetting applications

Cited by 7 publications

References 37 publications

Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays

Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays

TG/DSC/FTIR/QMS analysis of environmentally friendly poly(citronellyl methacrylate)-co-poly(benzyl methacrylate) copolymers

Low-cost Polyurethane Coating as Dielectric Component in Digital Microfluidics

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