Wettability of a microgrid‐structured polymer film with microfabrication utilizing the stick–slip phenomenon

Naito, K.; Yamada, Takazo; Tsutsumi, Takafumi; Yashiro, Keiji

doi:10.1002/app.45140

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…These values agree with contact angles reported in the literature. 47,48 The receding contact angles are significantly lower than advancing contact angles, resulting in a contact angle hysteresis (difference between q a and q r ) that varied from about 23°for PET to 39°for Direct measurements of adhesion forces of water droplets on smooth and patterned polymers Sun, Jiang, Choi et al…”

mentioning

confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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A microelectronic balance system was employed to measure the force of spreading (snap-in force) during water droplet attachment and spreading on polymer surfaces and the water-polymer adhesion forces (maximum adhesion and pulloff forces) after droplet compression, retreat and detachment. Equipped with a charge-coupled device camera and data acquisition software, the instrument measured directly the forces; monitored droplet-surface separation, including distances over which droplet stretched; and collected optical images simultaneously. The images were used to analyze capillary and surface tension forces based on measured droplet shape, surface curvature, droplet base radius and values of contact angles. The forces measured with the microbalance were compared to calculated capillary/surface tension forces. Nearly excellent agreement between directly measured and calculated forces was verified for polymers with smooth surfaces. Experiments with patterned polymers with pores and pillars revealed that interpretation of forces requires knowledge of a triple-contact-line characteristic. One relevant parameter, named normalized contact line length, was introduced to surface tension forces to quantify forces measured directly with a microbalance.

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mentioning

confidence: 99%

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

SunYujin

Jiang

ChoiChang-Hwan

et al. 2017

Surface Innovations

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“…Although it is suggested in the previous section that the formation of a thicker silver coating from the Nafion surface toward the significantly far inside of the Nafion body could result in the quite effective simultaneous bending and blocking force generation, it is not easy to put it in practice. As a trial, we performed the scathing of Nafion surface through the stick-slip micro level surface treatment [42,43]. Figure 17a shows the non-treated surface of Nafion.…”

Section: Stick-slip-surface Treated Ipmcmentioning

confidence: 99%

Simultaneous Enhancement of Bending and Blocking Force of an Ionic Polymer-Metal Composite (IPMC) by the Active Use of Its Material Characteristics Change

et al. 2019

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The exhibition of significantly large bending is a remarkable characteristic of an ionic polymer-metal composite (IPMC). However, its inability to generate a high enough force is a major problem in achieving a practical IPMC actuator. The simultaneous enhancement of bending and force generation is needed for broadening the potential of the IPMC actuator as a practical engineering device. Corrosive materials as a flexible electrode of the IPMC is usually not preferred, whereas a noncorrosive material such as platinum is broadly used. Here, we used silver, a corrosive metal, as an IPMC electrode intentionally. The silver electrode exhibits a reversible redox reaction upon an external electric stimulation. That silver redox reaction resulted in the material characteristics change of the IPMC, and it consequently resulted in the simultaneous enhancement of the IPMC bending curvature and blocking force generation. It was further found that the thicker silver coating anchored into the far inside of the IPMC led to the occurrence of a significant silver redox reaction and it altered the material characteristics of the IPMC, consequently turning the IPMC into a greatly deformable and high force generative one.

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“…We observed the surfaces of the PET and metal/PET films before and after SS processing using scanning electron microscopy (SEM) (S-4300, Hitachi High-Technologies, Minato-ku Tokyo, Japan) and scanning probe microscopy (SPM) (AFM 5400 L, Hitachi High-Technologies, Minato-ku Tokyo, Japan). In addition, when a fine periodic structure was present on the surface of the PET film and metal/PET films after SS processing, its period and depth were measured using SPM in the same way as in previous papers [1,7]. Hereafter, the period of the fine periodic structure formed by SS processing will be referred to as the structural period, and the depth of that structure will be referred to as the structural depth.…”

Section: Observation Of Surface Morphology and Measurement Of The Formentioning

confidence: 99%

“…We already reported several applications involving fabrication using this technique. And that applications are a film with anisotropic wettability and fiber with wavy periodic structure on its surface [7,8]. In the past, SS processing has only been used for polymer films (insulators that do not conduct electricity), though SS processing can in principle also be applied to any materials, including metals, as long as friction occurs under the condition that the static friction coefficient is larger than the kinetic friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Possibility of Fabricating Anisotropic Conductive Film with a Line-and-Space-Like Pattern by Stick-Slip Accompanying Abrasion

Naito

Kataoka

Yashiro

2019

JMMP

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The development of an anisotropic conductive film was attempted using original microfabrication (stick-slip (SS) processing) involving SS accompanying abrasion. During SS processing, the film surface was periodically scraped with a razor. For a metal-deposited polyethylene terephthalate (PET) film (metal/PET film), fine periodic structures (line and space (L/S)-like patterns) were formed on its surface because the metal layer was periodically scraped. This result proved that SS processing can be applied not only to polymers but also to metals. Moreover, the line interval of an SS-processed metal/PET film shortened as the contact force decreased, and the depth of the line became shallower in proportion to the line interval. In addition, SS-processed copper/PET (Cu/PET) film did not conduct electricity in the direction perpendicular to the Cu line; however, it conducted electricity in the direction parallel. Thus, this study shows the possibility of using SS processing for fabricating an anisotropic conductive film.

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Wettability of a microgrid‐structured polymer film with microfabrication utilizing the stick–slip phenomenon

Cited by 4 publications

References 18 publications

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Direct Measurements of Adhesion Forces for Water Droplets in Contact with Smooth and Patterned Polymers

Simultaneous Enhancement of Bending and Blocking Force of an Ionic Polymer-Metal Composite (IPMC) by the Active Use of Its Material Characteristics Change

Possibility of Fabricating Anisotropic Conductive Film with a Line-and-Space-Like Pattern by Stick-Slip Accompanying Abrasion

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