Wettability control using large-area nanostructured film

Kurihara, Kazuma; Suzuki, Yukiko; Suto, Kén; Shiba, N.; Nakano, Takashi; Tominaga, Junji

doi:10.1016/j.mee.2009.11.144

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…In step 1, the nano-imprint mold is fabricated by using a thermal laser lithography method [21]. The nano-pillar for forming the hydrophilic surface is 200 nm wide and 200 nm deep [22]. (a) The nano-pillars are formed on the glass wafer.…”

Section: Proposed Fabrication Processmentioning

confidence: 99%

Simple micro-patterning of high conductive polymer with UV-nano-imprinted patterned substrate and ethylene glycol-based second doping

Takamatsu¹,

Kurihara²,

Yamashita³

et al. 2014

J. Micromech. Microeng.

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We have developed a simple micro-patterning process for high conductive polymer (i.e., poly (3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)) with a patterned substrate by using an ultraviolet (UV) nano-imprint and an ethylene glycol-based second doping technique. In the patterning process, the PEDOT:PSS water dispersion is first coated only on the hydrophilic area, which is fabricated by UV nano-imprinting, forming patterned PEDOT:PSS on the substrate. The patterned PEDOT:PSS film is then immersed in the ethylene glycol as a second doping technique for increasing its conductivity. The proposed process provides simplicity in terms of shorter process steps of the UV nano-imprinting and PEDOT:PSS coating and higher conductivity of patterned PEDOT:PSS film than existing complicated micro-fabrication processes for organic materials. The 200 nm wide nano-imprinted pillar structures change the wettability of the substrate where the contact angle of the substrate is decreased from 66.8° to 33.3°. The patterning resolution with the nano-imprinted pattern substrate is down to 100 µm, which is useful for sensor applications. The conductivity increase delivers a low sheet resistance (120 Ω sq−1) of patterned PEDOT:PSS film. Then, the patterning of PEDOT:PSS sensor shapes with its 300 µm wide feature line and high conductivity are demonstrated. Therefore, our process leads to applications to a variety of PEDOT:PSS-based sensors.

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Section: Proposed Fabrication Processmentioning

confidence: 99%

Simple micro-patterning of high conductive polymer with UV-nano-imprinted patterned substrate and ethylene glycol-based second doping

Takamatsu¹,

Kurihara²,

Yamashita³

et al. 2014

J. Micromech. Microeng.

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“…In addition, when the pitch of the structures is less than half of the visible wavelength (i.e., around 250 nm), the substrate becomes transparent due to the subwavelength structure effect, because the incident light is not diffracted in this case [ 21 , 22 , 23 ]. In polymers, these surface structures are fabricated via the structure transfer processes, such as ultraviolet nanoimprinting, hot embossing, or injection moulding [ 24 , 25 , 26 , 27 , 28 , 29 ], which allow us to realize wetting control at low costs [ 30 , 31 , 32 ]. Therefore, wetting control by nanostructures is an effective method for medical and food packaging applications because plastic components that are used in the human body cannot be subjected to physical or chemical coatings, owing to contamination hazards.…”

Section: Introductionmentioning

confidence: 99%

Capillary Effect Enhancement in a Plastic Capillary Tube by Nanostructured Surface

2021

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We investigated the enhancement of the capillary effect in a plastic capillary tube using only a nanostructured surface. Since plastic is a hydrophobic material, the capillary effect does not emerge without an additional coating or plasma treatment process. Therefore, capillary effect enhancement by the nanostructure fabrication method is expected to reduce the cost and minimise the contamination produced in the human body. By combining a hydrophilic nylon resin and a nanostructure at the tip of the plastic pipette, we could confirm that the capillary effect was produced solely by the tube fabrication process. The produced capillary effect increased linearly with increasing nanostructure height when a standard solution with a surface tension of 70 mN·m−1 was used. Thus, we can conclude that including the plastic part with nanostructure can be useful for biomedical applications. In addition, we suggest that the proposed method is highly effective in controlling the wetting properties of plastic surfaces, compared to the typical coating or plasma treatment processes.

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“…It is often difficult to experimentally observe such flows and measure the velocity and the pressure simultaneously in three dimensions or to analyze them theoretically using the classical continuum dynamics approach based on a sharp-interface model. Computational fluid dynamics (CFD) simulations facilitate the understanding and prediction of two-phase flows for flexible and accurate control of fluid-particle motion and position; as a result, micro-fluidic devices and micro-electro-mechanical-systems (MEMS) device fabrication processes can be optimally designed [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Phase-field model-based simulation of two-phase fluid motion on partially wetted and textured solid surface

Tsuji

Matsumoto

et al. 2016

Journal of Computational Science

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Wettability control using large-area nanostructured film

Cited by 10 publications

References 15 publications

Simple micro-patterning of high conductive polymer with UV-nano-imprinted patterned substrate and ethylene glycol-based second doping

Simple micro-patterning of high conductive polymer with UV-nano-imprinted patterned substrate and ethylene glycol-based second doping

Capillary Effect Enhancement in a Plastic Capillary Tube by Nanostructured Surface

Phase-field model-based simulation of two-phase fluid motion on partially wetted and textured solid surface

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