Transparent gel composite films with multiple functionalities: Long-lasting anti-fogging, underwater superoleophobicity and anti-bacterial activity

England, Matt W.; Sato, Tomoya; Urata, Chihiro; Wang, Liming; Hozumi, Atsushi

doi:10.1016/j.jcis.2017.06.038

Cited by 43 publications

(36 citation statements)

References 47 publications

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“…36 Thus, doping of PFOS has little if any influence on the water absorbance performance and antifogging properties, while these functionalities were significantly influenced by the thicknesses of the samples (antifogging properties disappeared when the thickness fell below a threshold of around ∼12 nm), which is similar to that of our previous report. 36,37 Thanks to such excellent water-absorbing abilities, the resulting PFOS-(PVP/AMP-clay) films displayed long-lasting antifogging properties even after being left under highhumidity conditions (over 80% RH) for 3 days (Figure 3b) and in spite of having hydrophobic nature toward water drops.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This self-healing kinetics was comparable to our previous PVP/ AMP-clay films. 36,37 We also conducted abrasion testing of the PFOS-(PVP/AMP-clay) film with a metal brush and sand. In any case, when the size of the damaged area was within a 10 μm scale, they could be self-healed (Figures S8 and S9, at least 100 nm thickness was required for full self-healing).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Synthesis of the Clay Particles Covered with Aminopropyl Groups. According to previous reports, 36,37,46 the clay particles modified with aminopropyl functional groups (approximately ovalshaped platelet particles with an average size of ∼100 nm; we refer to this clay as AMP-clay) were synthesized. Briefly, 0.84 g (3.62 mmol) of MgCl 2 •6H 2 O was dissolved in ethanol (>20 g), after which 1.3 mL (5.85 mmol) of APTES was added to the solution with rapid stirring.…”

Section: ■ Introductionmentioning

confidence: 99%

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Large-Scale Formation of Fluorosurfactant-Doped Transparent Nanocomposite Films Showing Durable Antifogging, Oil-Repellent, and Self-healing Properties

2020

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Transparent nanocomposite films with multiple functionalities, such as durable antifogging, dynamic oleophobic, self-healing properties, were successfully prepared by a simple spin- or spray-coating method using aqueous solutions of poly(vinylpyrrolidone) (PVP) and aminopropyl-functionalized nanoclay (AMP-clay) platelets. In this study, anionic/waterborne perfluorooctanesulfonic acid potassium salt (PFOS) was premixed with the aqueous PVP solution to achieve a homogeneous dispersion of PFOS. Due to the addition of PFOS, the resulting nanocomposite film surfaces displayed statically hydrophobic (static water contact angle over 90°) and dynamically oleophobic (5 μL of oil droplets could slide off of the surface at low sliding/substrate tilt angles of less than 10°) behaviors. In spite of our nanocomposite film surface exhibiting a statically hydrophobic nature, the antifogging properties remained unchanged even after being left under high-humidity conditions (over 80% relative humidity) for 3 days. Thanks to both exceptional water-absorbing properties of PVP/AMP-clay matrices and good mobility of PFOS driven by moisture, our oil-repellent nanocomposite films could be repeatedly self-healed even after both severe physical (cutting, scratching, or falling sand abrasion) and chemical (vacuum UV oxidation) damages. Large-scale fabrication of this multifunctional nanocomposite film (30 cm × 30 cm) could also be successfully demonstrated by a spray-coating method based on in situ gel formation.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Large-Scale Formation of Fluorosurfactant-Doped Transparent Nanocomposite Films Showing Durable Antifogging, Oil-Repellent, and Self-healing Properties

2020

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“…However, the intriguing tendency of the CNTs material to attach to the center of the fiber for methanol-based solutions with PVP cannot be explained in terms of sonication or in terms of the initial dispersion conditions of the CNTs solution. As PVP has been used previously as the polymer matrix in optical-enhancing films on silica substrates [59,60,61,62], one possible scenario is a thin film of PVP covering the tip of the fiber preventing the direct interaction of the CNTs with the surface of the fiber. This film would also increase the optical energy needed to allow the deposition of CNTs material onto the fiber tip and thus enabling the deposition process mainly at the center of the fiber where the optical energy is concentrated.…”

Section: Discussionmentioning

confidence: 99%

Laser-Induced Deposition of Carbon Nanotubes in Fiber Optic Tips of MMI Devices

Cuando-Espitia

Bernal-Martínez²,

Torres-Cisneros

et al. 2019

Sensors

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The integration of carbon nanotubes (CNTs) into optical fibers allows the application of their unique properties in robust and versatile devices. Here, we present a laser-induced technique to obtain the deposition of CNTs onto the fiber optics tips of multimode interference (MMI) devices. An MMI device is constructed by splicing a section of no-core fiber (NCF) to a single-mode fiber (SMF). The tip of the MMI device is immersed into a liquid solution of CNTs and laser light is launched into the MMI device. CNTs solutions using water and methanol as solvents were tested. In addition, the use of a polymer dispersant polyvinylpyrrolidone (PVP) in the CNTs solutions was also studied. We found that the laser-induced deposition of CNTs performed in water-based solutions generates non-uniform deposits. On the other hand, the laser-induced deposition performed with methanol solutions generates uniform deposits over the fiber tip when no PVP is used and deposition at the center of the fiber when PVP is present in the CNTs solution. The results show the crucial role of the solvent on the spatial features of the laser-induced deposition process. Finally, we register and study the reflection spectra of the as-fabricated CNTs deposited MMI devices.

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“…5), 6) First, AMP-clay was prepared based on a solgel method. Briefly, 0.84 g (3.62 mmol) of MgCl 2 ·6H 2 O was dissolved in ethanol, after which 1.3 mL (5.85 mmol) of 3-aminopropyltriethoxysilane (APTES) was added to the solution, and stirred overnight at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Thermal properties of clay-containing nanocomposite films

Maeda

Sato

England

et al. 2017

J. Ceram. Soc. Japan

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Thermal properties of superhydrophilic nanocomposite films prepared from polyvinylpyrrolidone and aminopropylfunctionalized clay were studied. The films were treated at various relative humidities to absorb water. They showed excellent water-absorption properties and their capacity (amount of water absorbed from the air) was found to be markedly influenced by the relative humidity. Absorbed water into the films led to enhancement of their thermal diffusivity. Due to the large amount of absorbed water by the films after the treatment at 98%, their thermal conductive properties were considerably improved.

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Transparent gel composite films with multiple functionalities: Long-lasting anti-fogging, underwater superoleophobicity and anti-bacterial activity

Cited by 43 publications

References 47 publications

Large-Scale Formation of Fluorosurfactant-Doped Transparent Nanocomposite Films Showing Durable Antifogging, Oil-Repellent, and Self-healing Properties

Large-Scale Formation of Fluorosurfactant-Doped Transparent Nanocomposite Films Showing Durable Antifogging, Oil-Repellent, and Self-healing Properties

Laser-Induced Deposition of Carbon Nanotubes in Fiber Optic Tips of MMI Devices

Thermal properties of clay-containing nanocomposite films

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