Characterization of Surface Microstructures on Bio-based Polymer Film Fabricated with Nano-imprint Lithography by Synchrotron Radiation Small Angle X-ray Scattering

Shinohara, Takamichi; Shirahase, Tomoko; Murakami, Daiki; Hoshino, Taiki; Kikuchi, Moriya; Koike, Jun; Horigome, Misao; Masunaga, Hiroyasu; Ogawa, Hiroki; Takahara, Atsushi

doi:10.1088/1757-899x/24/1/012004

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…Although the NIL processes are mainly used to produce high-aspect-ratio silicon surfaces for designing semiconductors and photovoltaic materials, very recently they have been used in some biological applications to produce features ranging from tens of micrometers down to hundreds of nanometers. 34−36 In the present study, the formation of nano- and hierarchical (micro and nano) structures on the surface of PLLA has been investigated by means of thermal NIL to produce PLLA nanocomposite surfaces with antibacterial properties. As it can be seen in Figure 5, random cone- and needle-shaped nanostructures, 1–2 μm tall and 300–500 nm in diameter, were faithfully replicated on the surface of PLLA by thermal NIL for the first time.…”

Section: Resultsmentioning

confidence: 99%

Design of a Multifunctional Nanoengineered PLLA Surface by Maximizing the Synergies between Biochemical and Surface Design Bactericidal Effects

et al. 2018

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Nanotechnology, the manipulation of matter on atomic, molecular, and supramolecular scales, has become the most appealing strategy for biomedical applications and is of great interest as an approach to preventing microbial risks. In this study, we utilize the antimicrobial performance and the drug-loading ability of novel nanoparticles based on silicon oxide and strontium-substituted hydroxyapatite to develop nanocomposite antimicrobial films based on a poly( l -lactic acid) (PLLA) polymer. We also demonstrate that nanoimprint lithography (NIL), a process adaptable to industrial application, is a feasible fabrication technique to modify the surface of PLLA, to alter its physical properties, and to utilize it for antibacterial applications. Various nanocomposite PLLA films with nanosized (black silicon) and three-dimensional (hierarchical) hybrid domains were fabricated by thermal NIL, and their bactericidal activity against Escherichia coli and Staphylococcus aureus was assessed. Our findings demonstrate that besides hydrophobicity the nanoparticle antibiotic delivery and the surface roughness are essential factors that affect the biofilm formation.

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Section: Resultsmentioning

confidence: 99%

Design of a Multifunctional Nanoengineered PLLA Surface by Maximizing the Synergies between Biochemical and Surface Design Bactericidal Effects

et al. 2018

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“…No scattering spot pattern is observed from a flat PLA film (Figure 4a). In contrast, anisotropic scattering patterns were clearly observed up to the 10th order from the mold and the NIL_PLA and PS/NIL_PLA films 18 (Figures 4b-d). These anisotropic scattering spots were attributed to the surface and the 'buried'…”

Section: Wetting Behaviormentioning

confidence: 91%

Precise and nondestructive characterization of a ‘buried’ nanostructure in a polymer thin film using synchrotron radiation ultra-small angle X-ray scattering

Shinohara

Shirahase

Murakami

et al. 2012

Polym J

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Nanoimprint lithography (NIL) is a simple and high-resolution patterning method. Nanoimprinted structures can be fabricated not only as surface structures but also as 'buried' structures for applications such as electro-optical devices. However, a precise and nondestructive evaluation method for nanoimprinted structures has not yet been established. Synchrotron radiation ultrasmall angle X-ray scattering (SR-USAXS) is a nondestructive and high-resolution characterization method. In this study, we fabricated nanostructures on a poly(lactic acid) (PLA) film using NIL. In addition, the nanoimprinted PLA film was covered with a polystyrene thin film to fabricate a 'buried' structure. The fabricated surface and the 'buried' structure were evaluated using SR-USAXS. The scattering pattern was clearly obtained from the surface and the 'buried' structure. The size of the 'buried' structure, which was estimated from the diffraction pattern, was in good agreement with that of the surface structure. These results indicate that SR-USAXS is powerful tool for the nondestructive and precise characterization of surface and 'buried' structures.

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“…To estimate the chain orientation, measurements were performed with the X-ray beam oriented parallel and perpendicular to the line pattern. [16][17][18][19][20][21][22][23][24] To improve angular resolution, a soller slit was installed in front of the detectors. The divergence angle was determined to be 0.099°.…”

Section: Characterizationmentioning

confidence: 99%

“…The anisotropic scattering spots are attributed to the periodic structure of the surface for NI_P3HT and the "buried" nano-structure for PCBM/NI_P3HT, respectively. 18,19) The periodic distance, d, was estimated using…”

Section: Sr-saxsmentioning

confidence: 99%

“…Recently, we showed that synchrotron radiation small angle X-ray scattering (SR-SAXS) is a powerful tool to characterize "buried" nanostructures. 18,19) Here, the morphology and interdigitization at the P3HT/PCBM interface is investigated using SR-SAXS. The chain orientation and crystal structure of the OHJ-OPV was confirmed by grazing incidence X-ray diffraction (GIXD).…”

Section: Introductionmentioning

confidence: 99%

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“Buried” nano-structure and molecular aggregation state in ordered heterojunction poly(3-hexylthiophene)-based photovoltaics

Shinohara

Higaki

Hoshino

et al. 2014

Jpn. J. Appl. Phys.

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The morphology of ordered heterojunction organic photovoltaics (OHJ-OPVs) interfaces was evaluated using synchrotron radiation small angle X-ray scattering and grazing incidence X-ray diffraction. [6,6$]-phenyl C61-butyric acid methyl ester (PCBM) was deposited on the line/space patterned poly(3-hexylthiophene-2,5-diyl) (P3HT) thin film fabricated by nano-imprinting. After deposition of the PCBM film, the P3HT thin film retained the rectangular edge features of the imprinted mold, with some Gaussian broadening due to interdiffusion and partial phase mixing at the P3HT/PCBM interface. The P3HT main chains were oriented vertically in the nano-imprinted line pattern and showed π-π stacking along the line direction. PCBM nano-crystals exist throughout the OHJ-OPV thin film.

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Characterization of Surface Microstructures on Bio-based Polymer Film Fabricated with Nano-imprint Lithography by Synchrotron Radiation Small Angle X-ray Scattering

Cited by 6 publications

References 12 publications

Design of a Multifunctional Nanoengineered PLLA Surface by Maximizing the Synergies between Biochemical and Surface Design Bactericidal Effects

Design of a Multifunctional Nanoengineered PLLA Surface by Maximizing the Synergies between Biochemical and Surface Design Bactericidal Effects

Precise and nondestructive characterization of a ‘buried’ nanostructure in a polymer thin film using synchrotron radiation ultra-small angle X-ray scattering

“Buried” nano-structure and molecular aggregation state in ordered heterojunction poly(3-hexylthiophene)-based photovoltaics

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