Evaluation of removal of model particulate and oily soils from poly(ethylene terephthalate) films by microscopic image analysis

Gotoh, Kunihito; Yu, Ning; Tagawa, Yumiko

doi:10.5650/jos.62.73

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…The microscopic image of the soil deposited on the PET film was converted from an original gray-scale digital image with 256 possible intensity values to a binary image using a suitable threshold level (~105 in most cases). [25] The surface coverage by the soil particles deposited onto the PET film was determined.…”

Section: Soil Deposition Testmentioning

confidence: 99%

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Gotoh

Yonehara

et al. 2015

Journal of Adhesion Science and Technology

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Polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) films were treated with an atmospheric-pressure plasma (APP) jet and a 172-nm ultraviolet (UV) excimer light in air. The advancing and receding water contact angles on both films decreased after the treatments, especially after APP treatment. After the treatments, the hydrophobic recovery was observed and almost diminished within a week. The dispersive component of the surface free energy of the two polyester films did not change due to the APP and UV exposure, whereas the acid-base component drastically increased after the treatments. The X-ray photoelectron spectroscopy results showed that the polyester film surfaces were oxidized by the treatments. From the AFM images, the topographical change on the film surfaces due to the treatments was clearly observed. It was found that the APP treatment of the PET film prevented the deposition of particulate soils in air due to the decrease in the contact area between the film and the soil particle. Furthermore, the soil release in the aqueous solutions was promoted as a result of the hydrophilization of the polyester films due to the APP treatment. IntroductionPolyethylene terephthalate (PET) has high strength, high resilience, good impact resistance, and outstanding processability. Because of its many applications, PET is one of the most common plastics available today. One of the most common applications is for drink bottles, including those for soft drinks. PET films are used for balloons, flexible food packaging, space blankets, and as a carrier for magnetic tape, or a backing for pressure-sensitive adhesive tape. PET is used for major textile fibers, which are known as polyester.Polyethylene naphthalate (PEN) is a new-generation polyester polymer of naphthalene-2, 6-dicarboxylate, and ethylene glycol. Although PEN is more expensive than PET, PEN exhibits higher dimensional stability, shrinkage resistance, and temperature stability, and better barrier properties than PET. Owing to its superior modulus of stiffness, PEN can be used to produce films of equivalent strength to PET but at a lower thickness and narrower width. Such films are advantageous for electrical applications,

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Section: Soil Deposition Testmentioning

confidence: 99%

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Gotoh

Yonehara

et al. 2015

Journal of Adhesion Science and Technology

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“…In our previous studies, fatty acid removal from the PET films with simple geometries has been evaluated using microscopic image analysis [6,7]. In this method, the total area of soil deposited on the film was extracted by binary processing, which makes it possible to evaluate the detergency of colorless and unevenly deposited soils.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of the Removal of Fatty Acid from a Pet Surface Using a Quartz Crystal Microbalance

Kanasaki

Kobayashi

Gotoh

2016

J Surfact & Detergents

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A quartz crystal microbalance (QCM) was used to study the removal of stearic acid from poly(ethylene terephthalate) (PET) substrate in aqueous alkali and surfactant solutions. The PET substrate was prepared on a QCM gold electrode by spin-coating; its properties were examined by scanning electron microscopy, X-ray photoelectron spectroscopy, and water contact angle measurements. As a result, the QCM electrode was found to be completely covered with a smooth PET film. To investigate the effect of soil deposition state on its removal, stearic acid (an oily soil model) was deposited onto the PET substrate with the Langmuir-Blodgett (LB) technique or by spraying. The QCM frequency was recorded during the removal of stearic acid from the PET substrate in aqueous solutions. In NaOH solution, stearic acid deposited by the LB method was more rapidly removed than when deposited by the spraying method. However, the LB films of stearic acid were difficult to be removed in surfactant solutions. With respect to removal behavior of spray-deposited stearic acid in surfactant solutions, the results determined by the QCM method were compared with those from microscopic image analysis. The removal efficiencies in the sodium dodecyl sulfate solution were in good agreement between the two methods. However, in the alkyl ethoxylate solution, the removal efficiencies obtained by the QCM method were larger than those from microscopic image analysis. These experimental results were explained by the removal mechanism of stearic acid by the alkali and surfactant solutions.

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“…Lipids and other deposits from the eye are known to form on contact lenses and can impair cleanability as well as causing discomfort to wearers (45). It has been demonstrated that CAP proved superior to ultrasonic cleaning in removing stearic acid from polymer films (46). Moreover, it was reported in the same study that CAP treatment improved the wettability of the polymer-a factor that has been shown to be important in contact lens care (45).…”

Section: Discussionmentioning

confidence: 99%

Inactivation of Acanthamoeba spp. and Other Ocular Pathogens by Application of Cold Atmospheric Gas Plasma

Heaselgrave

Shama

Andrew

et al. 2016

Appl Environ Microbiol

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dCurrently there are estimated to be approximately 3.7 million contact lens wearers in the United Kingdom and 39.2 million in North America. Contact lens wear is a major risk factor for developing an infection of the cornea known as keratitis due to poor lens hygiene practices. While there is an international standard for testing disinfection methods against bacteria and fungi (ISO 14729), no such guidelines exist for the protozoan Acanthamoeba, which causes a potentially blinding keratitis most commonly seen in contact lens wearers, and as a result, many commercially available disinfecting solutions show incomplete disinfection after 6 and 24 h of exposure. Challenge test assays based on international standard ISO 14729 were used to determine the antimicrobial activity of cold atmospheric gas plasma (CAP) against Pseudomonas aeruginosa, Candida albicans, and trophozoites and cysts of Acanthamoeba polyphaga and Acanthamoeba castellanii. P. aeruginosa and C. albicans were completely inactivated in 0.5 min and 2 min, respectively, and trophozoites of A. polyphaga and A. castellanii were completely inactivated in 1 min and 2 min, respectively. Furthermore, for the highly resistant cyst stage of both species, complete inactivation was achieved after 4 min of exposure to CAP. This study demonstrates that the CAP technology is highly effective against bacterial, fungal, and protozoan pathogens. The further development of this technology has enormous potential, as this approach is able to deliver the complete inactivation of ocular pathogens in minutes, in contrast to commercial multipurpose disinfecting solutions that require a minimum of 6 h.

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Evaluation of removal of model particulate and oily soils from poly(ethylene terephthalate) films by microscopic image analysis

Cited by 11 publications

References 18 publications

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Surface hydrophilization of two polyester films by atmospheric-pressure plasma and ultraviolet excimer light exposures

Dynamic Analysis of the Removal of Fatty Acid from a Pet Surface Using a Quartz Crystal Microbalance

Inactivation of Acanthamoeba spp. and Other Ocular Pathogens by Application of Cold Atmospheric Gas Plasma

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