Mohammod Aminuzzaman

Tohoku University, Sendai, Kagoshima-ken, Japan

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Publications (12)24.48 Total impact

  • Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji Miyashita
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    ABSTRACT: This review describes the bottom‐up design of ultra‐thin fluorinated polymer films. Fluorinated polymer assemblies offer unique and application‐oriented properties strongly correlated with surface chemistry. We focus on our recent topic of research, fluorinated polymer nanosheets, which are ultra‐thin polymer films fabricated from amphiphilic fluorinated polyalkylacrylamides using the elegant Langmuir–Blodgett technique. These fluorinated polymer nanosheets have excellent hydrophobicity, extremely low surface energy and a low friction coefficient. Therefore, fluorinated polymer nanosheets are attractive nanomaterials for surface modification in terms of tailoring of wettability, frictional properties, adhesion and surface chemistry. The nanocoating technique using reactive fluorinated polymer nanosheets and surface modification of hard disks and microchannels are also reviewed. Copyright © 2010 Society of Chemical Industry
    Polymer International 01/2010; 59(5):583 - 596. · 2.13 Impact Factor
  • Mohammod Aminuzzaman, Masaya Mitsuishi, Tokuji Miyashita
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    ABSTRACT: This paper describes an effective approach to surface modification of a flexible polyimide film using a reactive fluorinated polymer nanosheet. N-(1H,1H-pentadecafluorooctyl)methacrylamide copolymers containing carboxyl group as a reactive moiety form stable monolayer on the water surface and highly ordered reactive polymer nanosheets can be fabricated by the Langmuir–Blodgett technique. This reactive fluorinated polymer nanosheet was utilized to modify the surface properties of polyimide film through its immobilization using thermal treatment. The modification process was studied by X-ray photoelectron spectroscopy (XPS) and modified PI surface was characterized by contact angle measurements and atomic force microscopy (AFM).
    Thin Solid Films 01/2010; 519(3):974-977. · 1.87 Impact Factor
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    Akira Watanabe, Mohammod Aminuzzaman, Tokuji Miyashita
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    ABSTRACT: The requirement for microwiring technology by a wet process has significantly increased recently toward the achievement of printable and flexible electronics. We have developed the metal microwiring with a resolution higher than 1 mum by the laser direct writing technique using Ag and Cu nano-particle-dispersed films as precursors. The technique was applied to the microwiring on a flexible and transparent polymer film. The metallization is caused in a micro-region by focused laser beam, which reduces the thermal damage of the flexible polymer substrate during the metallization process. The laser direct writing technique is based on the efficient and fast conversion of photon energy to thermal energy by direct excitation of the plasmon absorption of a metal nano-particle, which provides Cu microwiring with a low resistivity owing to the inhibition of the surface oxidation of the Cu nano-particle.
    Proc SPIE 02/2009;
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    ABSTRACT: The paper describes microscopic temperature imaging with luminescent polymer nanosheets. Europium complexes were incorporated in ultrathin polymer film prepared by the Langmuir-Blodgett (LB) technique for temperature sensing in microchannels. Straight and T-shaped microchannels were fabricated so that the bottom surface of the microchannels served as the temperature sensing plane. This set-up allows a two-dimensional temperature mapping of the thermal fluid flow in the microchannel. Both steady-state and dynamic processes of temperature distribution was clearly imaged by using a fluorescence microscope equipped with a digital CCD camera with good spatial and time resolution of 1.9 microm and 0.3 K. The results indicate that the polymer nanosheets prepared by the LB technique are a good candidate to develop the fundamental understanding of microfluidic systems.
    Journal of Nanoscience and Nanotechnology 02/2009; 9(1):90-6. · 1.15 Impact Factor
  • Mohammod Aminuzzaman, Akira Watanabe, Tokuji Miyashita
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    ABSTRACT: This paper describes fabrication of silver (Ag) micropatterns on a double-decker-shaped polysilsesquioxane (DDPSQ) hybrid film by laser-induced pyrolysis (LIP) of a film prepared from liquid-dispersed Ag nanoparticles. The line width of Ag micropatterns fabricated by LIP can be controlled flexibly by changing the numerical aperture (NA) value of an objective lens and the focusing point. By changing NA value of an objective lens, line widths of Ag micropatterns can be varied flexibly from 75 μm to 5 μm. The Ag micropatterns show an excellent adherence to DDPSQ surface as evaluated by adhesive tape test. The resistivity of the Ag micropattern is determined to be 4.3 × 10− 6 Ω cm, which is comparable to that of bulk Ag (1.6 × 10− 6 Ω cm).
    Thin Solid Films 01/2009; · 1.87 Impact Factor
  • Mohammod Aminuzzaman, Akira Watanabe, Tokuji Miyashita
    Journal of Photopolymer Science and Technology - J PHOTOPOLYM SCI TECHNOL. 01/2008; 21(4):537-540.
  • Mohammod Aminuzzaman, Akira Watanabe, Tokuji Miyashita
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    ABSTRACT: The surface modification of a double-decker-shaped polysilsesquioxane (DDPSQ) film by deep ultraviolet (UV) irradiation (λ = 185 and 254 nm) was studied in the presence of atmospheric oxygen at room temperature. The change in the surface structure of a DDPSQ hybrid film was observed by means of contact angle measurements, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Exposure to deep UV light was found to convert the surface of DDPSQ film from hydrophobic to hydrophilic due to the formation of silanolgroups (Si–OH) on the DDPSQ film. Measurements of FT-IR and XPS indicate that the Si–O–Si cage structure of DDPSQ was converted to the Si–O–Si network structure of SiO2 through cleavage of the Si–O–Si cage with deep UV irradiation. The irradiated DDPSQ film surface is very smooth with a root-mean-square (RMS) roughness of 0.34 nm. Moreover, to demonstrate the effect of surface modification of a DDPSQ film on the adhesion of metals, we fabricated silver (Ag) micropatterns on the deep UV modified DDPSQ film by laser-induced pyrolysis of a film prepared from liquid-dispersed Agnanoparticles. The Ag micropatterns show an excellent adhesion to the modified DDPSQ surface as assessed by the Scotch tape test.
    Journal of Materials Chemistry 01/2008; 18(42). · 5.97 Impact Factor
  • Mohammod Aminuzzaman, Yuko Kado, Masaya Mitsuishi, Tokuji Miyashita
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    ABSTRACT: The frictional properties of an immobilized fluorinated polymer nanosheet were investigated to develop an ultrathin solid lubrication film with an excellent wear-resistant. N-(1H,1H-Pentadecafluorooctylmethacrylamide) copolymers containing carboxyl group as a reactive moiety form a stable monolayer on the water surface and a highly ordered reactive fluorinated polymer nanosheet can be fabricated by the Langmuir–Blodgett technique. The reactive fluorinated polymer nanosheet was immobilized onto solid substrates through chemical binding with an aminosilane coupling agent, and the film showed smooth surface even after the reaction. The immobilized fluorinated polymer nanosheet had a low friction coefficient and strong wear-resistant.
    Thin Solid Films 01/2007; 516(1):67-71. · 1.87 Impact Factor
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    ABSTRACT: The Langmuir-Blodgett(LB)technique was utilized to control surface properties of narrow microchannel walls at the molecular scale. Fluorinated amphiphilic polymer(pC7F15MAA)was synthesized and its ultrathin films were prepared by the LB technique. Microchannel was fabricated with glass substrates. A laminar flow of water in hydrophilic and hydrophobic microchannels was monitored in situ using an optical microscope equipped with a digital CCD camera. Shape of meniscus was clearly monitored with 250 ms time-resolution. The fluorinated polymer LB film can be a good candidate to control water motion in the microchannel.
    Molecular Crystals and Liquid Crystals - MOL CRYST LIQUID CRYST. 01/2004; 424(1):273-277.
  • Mohammod Aminuzzaman, Yuko Kado, Masaya Mitsuishi, Tokuji Miyashita
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    ABSTRACT: N-(1H,1H-Pentadecafluorooctyl)methacrylamide copolymers containing carboxyl groups as reactive moieties were prepared to explore a novel method for surface nanocoating materials. All the copolymers form stable monolayers on a water surface. Those monolayers can be transferred onto solid substrates, thereby creating Y-type Langmuir–Blodgett (LB) films. Contact angle and critical surface tension measurements were used to characterize the surfaces of the copolymer LB films. The copolymer monolayer can be immobilized onto solid substrates that are modified with an aminosilane coupling agent through heat treatment. We monitored the immobilization process using water contact angle and X-ray photoelectron spectroscopy (XPS) measurements. The immobilized monolayer on SiO2 surface yields a smooth surface at the nanoscale, which was observed using atomic force microscopy.
    Journal of Materials Chemistry 01/2004; 14(20). · 5.97 Impact Factor
  • Source
    Mohammod Aminuzzaman, Yuko Kado, Mitsuishi, Tokuji Miyashita
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    ABSTRACT: The monolayer behavior of poly(N-1H,1H-pentadecafluorooctylmethacrylamide) (pC7F15MAA) spread on the air–water interface was investigated by measurement of surface pressure-area isotherm at different subphase temperatures. The monolayer of pC7F15MAA was transferred onto solid substrates as Y-type Langmuir–Blodgett (LB) film and the monolayer thickness was calculated by X-Ray diffraction techniques and surface plasmon measurements. Wettability and the surface structure of the LB film were investigated by measuring the static contact angle (cos θ) of water on the surface. The wettability varied slightly with increasing temperature. The critical surface tension measurement suggests that the surface of pC7F15MAA LB film covered mainly with CF3 groups.
    Polymer Journal 10/2003; 35(10):785-790. · 1.50 Impact Factor
  • Mohammod Aminuzzaman, Akira Watanabe, Tokuji Miyashita
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    ABSTRACT: This article describes fabrication of Ag micropatterns on a flexible polyimide (PI) film by laser direct writing using an Ag nanoparticle-dispersed film as a precursor. Ag micropatterns are characterized by optical microscopy, atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM), surface profilometry, and resistivity measurements. The line width of Ag micropatterns can be effectively controlled by altering the experimental parameters of laser direct writing especially laser intensity, objective lens, and laser beam scanning speed etc. Using an objective lens of 100× and laser intensity of 170.50kW/cm2, Ag micropatterns with a line width of about 6μm have been achieved. The Ag micropatterns show strong adhesion to polyimide surface as evaluated by Scotch-tape test. The resistivity of the Ag micropatterns is determined to be 4.1×10−6Ωcm using two-point probe method. This value is comparable with the resistivity of bulk Ag (1.6×10−6Ωcm). KeywordsFlexible electronics-Polymer-Laser direct writing-Nanometal ink-Micropatterns-Resistivity-Nanomanufacturing
    Journal of Nanoparticle Research 12(3):931-938. · 2.18 Impact Factor