Captive-air-bubble aerophobicity measurements of antibiofouling coatings for underwater MEMS devices

Mariello, Massimo; Guido, Francesco; Mastronardi, Vincenzo Mariano; Donato, Francesco De; Salbini, Maria; Brunetti, Virgilio; Qualtieri, Antonio; Rizzi, Francesco; Vittorio, Massimo De

doi:10.1177/1847980419862075

Cited by 21 publications

(20 citation statements)

References 36 publications

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“…This approach can be used as a preliminary step before being subjected to advanced reported techniques to improve removal efficiency. Several authors reported on a new methodology to remove pharmaceutical contaminants from wastewater, such as (a) triboelectric generator, (b) microalgae, (c) nanofiltration membrane bioreactor, (d) polymeric coating, and (e) piezoelectric electrospun nanofiber membrane [ 19 , 20 , 21 , 22 , 23 ]. Khushwaha et al developed a triboelectric generator as an efficient and green approach (80% degradation efficiency achieved using the triboelectric effect) to treat wastewater [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…The working principle of these methods are based on the generation of free radicals (hydroxyl group) using a powerful oxidizing agent [18]. Several new approaches have been reported to remove pharmaceutical contaminants from wastewater, such as a triboelectric generator, microalgae, nanofiltration, membrane bioreactor, polymeric coating, and piezoelectric electrospun nanofiber membrane [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Application of Green Nanoemulsion for Elimination of Rifampicin from a Bulk Aqueous Solution

Hussain

Mahdi

Alshehri

et al. 2021

IJERPH

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The study aimed to prepare green nanoemulsion (GNE) multi-components ((water/dimethyl sulfoxide–transcutol/isopropyl alcohol/capmul MCM C8 (CMC8)) to remove rifampicin (RIF) from a contaminated aqueous bulk solution. Pseudo ternary phase diagrams dictated several batches of GNE prepared following the reported method. Selected nanoemulsions (NF1–NF5) were characterized for morphology, globular size, size distribution (polydispersity index, PDI), viscosity, zeta potential, refractive index (RI), and free-thaw kinetic stability. They were investigated for percent removal efficiency (%RE) of RIF from the bulk aqueous solution for varied time intervals (10–60 min). Finally, scanning electron microscopy–energy dispersive x-ray (SEM–EDX) and inductive coupled plasma–optical emission system (ICP–OE) were used to confirm the extraction of trace content of dimethyl sulfoxide (DMSO) and others in the treated water. Considering the data obtained for globule size, PDI, viscosity, zeta potential, freeze–thaw stability, and refractive index, NF5 was the most suitable for RIF removal. The largest %RE value (91.7%) was related to NF5, which may be prudent to correlate with the lowest value (~39 nm) of size (maximum surface area available for contact adsorption), PDI (0.112), and viscosity (82 cP). Moreover, %RE was profoundly influenced by the content of CMC8 and the aqueous phase. These two phases had immense impact on the viscosity, size, and RI. The percent content of water, Smix, and CMC8 were 15% w/w), 60% w/w, and 25% w/w, respectively in NF5. SEM–EDX and ICP–OE confirmed the absence of DMSO and other hydrophilic components in the treated water. Thus, efficient NF5 could be a promising option to the conventional method to decontaminate the polluted aqueous system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Green Nanoemulsion for Elimination of Rifampicin from a Bulk Aqueous Solution

Hussain

Mahdi

Alshehri

et al. 2021

IJERPH

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“…The methods for preparing the coatings are also reported in [52]. Moreover, in this work, the temperature was kept inside the range allowed by the device materials.…”

Section: Methodsmentioning

confidence: 99%

“…The whole devices and some coated silicon substrates (three for each coating) were submerged in a tank (440 × 265 × 240 mm 3 ) and filled with seawater which was aimed at reproducing the marine environment (Figure 5a). The natural seawater was collected from the Ionian Sea, with the following physico-chemical parameters: salinity 3.5%, pH 8, metals (Na 10,784 ppm, K 399 ppm, Mg 1294 ppm, Ca 4120 ppm, Si 2.9 ppm), halogenides (Br − /Cl − /F − 19360/67.5/1.3 ppm), carbonates (HCO 3 − 126 ppm), sulphates (SO 4 2712 ppm), and dissolved gases (O 2 7 ppm, N 2 12.5 ppm) [52].…”

Section: Methodsmentioning

confidence: 99%

Reliability of Protective Coatings for Flexible Piezoelectric Transducers in Aqueous Environments

et al. 2019

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Electronic devices used for marine applications suffer from several issues that can compromise their performance. In particular, water absorption and permeation can lead to the corrosion of metal parts or short-circuits. The added mass due to the absorbed water affects the inertia and durability of the devices, especially for flexible and very thin micro-systems. Furthermore, the employment of such delicate devices underwater is unavoidably subjected to the adhesion of microorganisms and formation of biofilms that limit their reliability. Thus, the demand of waterproofing solutions has increased in recent years, focusing on more conformal, flexible and insulating coatings. This work introduces an evaluation of different polymeric coatings (parylene-C, poly-dimethyl siloxane (PDMS), poly-methyl methacrylate (PMMA), and poly-(vinylidene fluoride) (PVDF)) aimed at increasing the reliability of piezoelectric flexible microdevices used for sensing water motions or for scavenging wave energy. Absorption and corrosion tests showed that Parylene-C, while susceptible to micro-cracking during prolonged oscillating cycles, exhibits the best anti-corrosive behavior. Parylene-C was then treated with oxygen plasma and UV/ozone for modifying the surface morphology in order to evaluate the biofilm formation with different surface conditions. A preliminary characterization through a laser Doppler vibrometer allowed us to detect a reduction in the biofilm mass surface density after 35 days of exposure to seawater.

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“…(E) Proposed working principle for the TENG under finger tapping: the steps of the press-release cycle are illustrated and indicated for the inset of the output voltage signal.The TENG proposed in the present work is envisioned to be easily employed in distributed arrays to meet the power requirements of various wearable, flexible energy harvesting devices. Moreover, the adoption of parylene C as an external encapsulating friction layer makes the device suitable for employment in harsh environments; for instance, for scavenging energy from falling raindrops, since the protective anti-corrosion and anti-biofouling behavior of parylene have been demonstrated in previous works[60,[66][67][68][69].…”

mentioning

confidence: 99%

Novel Flexible Triboelectric Nanogenerator based on Metallized Porous PDMS and Parylene C

Mariello

Scarpa

Algieri³

et al. 2020

Energies

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Triboelectric nanogenerators (TENGs) have recently become a powerful technology for energy harvesting and self-powered sensor networks. One of their main advantages is the possibility to employ a wide range of materials, especially for fabricating inexpensive and easy-to-use devices. This paper reports the fabrication and preliminary characterization of a novel flexible triboelectric nanogenerator which could be employed for driving future low power consumption wearable devices. The proposed TENG is a single-electrode device operating in contact-separation mode for applications in low-frequency energy harvesting from intermittent tapping loads involving the human body, such as finger or hand tapping. The novelty of the device lies in the choice of materials: it is based on a combination of a polysiloxane elastomer and a poly (para-xylylene). In particular, the TENG is composed, sequentially, of a poly (dimethylsiloxane) (PDMS) substrate which was made porous and rough with a steam-curing step; then, a metallization layer with titanium and gold, deposited on the PDMS surface with an optimal substrate–electrode adhesion. Finally, the metallized structure was coated with a thin film of parylene C serving as friction layer. This material provides excellent conformability and high charge-retaining capability, playing a crucial role in the triboelectric process; it also makes the device suitable for employment in harsh, wet environments owing to its inertness and barrier properties. Preliminary performance tests were conducted by measuring the open-circuit voltage and power density under finger tapping (~2 N) at ~5 Hz. The device exhibited a peak-to-peak voltage of 1.6 V and power density peak of 2.24 mW/m2 at ~0.4 MΩ. The proposed TENG demonstrated ease of process, simplicity, cost-effectiveness, and flexibility.

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Captive-air-bubble aerophobicity measurements of antibiofouling coatings for underwater MEMS devices

Cited by 21 publications

References 36 publications

Application of Green Nanoemulsion for Elimination of Rifampicin from a Bulk Aqueous Solution

Application of Green Nanoemulsion for Elimination of Rifampicin from a Bulk Aqueous Solution

Reliability of Protective Coatings for Flexible Piezoelectric Transducers in Aqueous Environments

Novel Flexible Triboelectric Nanogenerator based on Metallized Porous PDMS and Parylene C

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