Development of graphene oxide – PDMS composite dielectric for rapid droplet movement in digital microfluidic applications

Basu, Mainak; Parihar, Vartika; Lincon, Abhijit; Joshi, Vedant P.; Das, Soumen; DasGupta, Sunando

doi:10.1016/j.ces.2020.116175

Cited by 8 publications

(4 citation statements)

References 62 publications

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“…PDMS forms the adsorption layer with a flat structure, in which a maximal interaction of macromolecules with the GO–Fe 3 O 4 surface active sites is implemented . The higher value of aspect ratio results in an enhanced contact area for the interaction and promotes proper distribution of the nanofiller in the polymer matrix . GO causes strong hydrogen-bond interactions between PDMS chains and GO, leading to the formation of an even thicker interphase layer.…”

Section: Resultsmentioning

confidence: 99%

“…86 The higher value of aspect ratio results in an enhanced contact area for the interaction and promotes proper distribution of the nanofiller in the polymer matrix. 87 GO causes strong hydrogen-bond interactions between PDMS chains and GO, leading to the formation of an even thicker interphase layer. The large difference in electronegativity between silicon and oxygen atoms in the main chain of PDMS causes the partial ionic nature of the (Si−O) bond, which would induce strong interactions between PDMS and GO− Fe 3 O 4 .…”

Section: Durability In Terms Of Mechanical Andmentioning

confidence: 99%

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Bioinspired Graphene Oxide–Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces

et al. 2023

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Antifouling (AF) nanocoatings made of polydimethylsiloxane (PDMS) are more cost-efficient and eco-friendly substitutes for the already outlawed tributyltin-based coatings. Here, a catalytic hydrosilation approach was used to construct a design inspired by composite mosquito eyes from non-toxic PDMS nanocomposites filled with graphene oxide (GO) nanosheets decorated with magnetite nanospheres (GO–Fe3O4 nanospheres). Various GO–Fe3O4 hybrid nanofillers were dispersed into the PDMS resin through a solution casting method to evaluate the structure–property relationship. A simple coprecipitation procedure was used to fabricate magnetite nanospheres with an average diameter of 30–50 nm, a single crystal structure, and a predominant (311) lattice plane. The uniform bioinspired superhydrophobic PDMS/GO–Fe3O4 nanocomposite surface produced had a micro-/nano-roughness, low surface-free energy (SFE), and high fouling release (FR) efficiency. It exhibited several advantages including simplicity, ease of large-area fabrication, and a simultaneous offering of dual micro-/nano-scale structures simply via a one-step solution casting process for a wide variety of materials. The superhydrophobicity, SFE, and rough topology have been studied as surface properties of the unfilled silicone and the bioinspired PDMS/GO–Fe3O4 nanocomposites. The coatings’ physical, mechanical, and anticorrosive features were also taken into account. Several microorganisms were employed to examine the fouling resistance of the coated specimens for 1 month. Good dispersion of GO–Fe3O4 hybrid fillers in the PDMS coating until 1 wt % achieved the highest water contact angle (158° ± 2°), the lowest SFE (12.06 mN/m), micro-/nano-roughness, and improved bulk mechanical and anticorrosion properties. The well-distributed PDMS/GO–Fe3O4 (1 wt % nanofillers) bioinspired nanocoating showed the least biodegradability against all the tested microorganisms [Kocuria rhizophila (2.047%), Pseudomonas aeruginosa (1.961%), and Candida albicans (1.924%)]. We successfully developed non-toxic, low-cost, and economical nanostructured superhydrophobic FR composite coatings for long-term ship hull coatings. This study may expand the applications of bio-inspired functional materials because for multiple AF, durability and hydrophobicity are both important features in several industrial applications.

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Section: Resultsmentioning

confidence: 99%

Section: Durability In Terms Of Mechanical Andmentioning

confidence: 99%

Bioinspired Graphene Oxide–Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces

et al. 2023

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“…Currently, various polymers such as Teflon AF, CytopTM, and Parylene-C have been applied as electrowetting dielectric layers, while these materials generally have low dielectric constants, typically around 2, necessitating high driving voltages during the electrowetting process and increasing the risk of breakdown. To address this issue, a widely adopted approach is to incorporate inorganic nanoparticles into the polymer matrix to increase the dielectric constant. − These nanoparticles, such as graphene, BaTiO 3 , BST, TiO 2 , and AgNWs@SiO 2 , possess high dielectric constants and are modified to blend seamlessly with the polymer matrix. However, adding nanoparticles inevitably affects the surface morphology, transmittance, and electric field uniformity of the polymer film.…”

Section: Introductionmentioning

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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“…Due to its multifunctional biological characteristics, it is considered as a strong quenching element. 12,13 The unique optical properties of gold nanoparticles are important factors for them to become label-free detection elements. Gold nanoparticles have been widely used in the detection of nucleic acids, proteins, heavy metal ions and so on.…”

Section: Introductionmentioning

confidence: 99%

Detection of chymotrypsin using a peptide sensor based on graphene oxide modified with sulfhydryl groups and gold nanoparticles

Liu

Bianjiang

et al. 2022

New J. Chem.

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Development of graphene oxide – PDMS composite dielectric for rapid droplet movement in digital microfluidic applications

Cited by 8 publications

References 62 publications

Bioinspired Graphene Oxide–Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces

Bioinspired Graphene Oxide–Magnetite Nanocomposite Coatings as Protective Superhydrophobic Antifouling Surfaces

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

Detection of chymotrypsin using a peptide sensor based on graphene oxide modified with sulfhydryl groups and gold nanoparticles

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