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Manfredo Guilizzoni - One of the best experts on this subject based on the ideXlab platform.

  • x ray computed microtomography for drop shape analysis and Contact Angle Measurement
    Journal of Colloid and Interface Science, 2013
    Co-Authors: Maurizio Santini, Manfredo Guilizzoni, Stephanie Festsantini
    Abstract:

    The interaction between an atomized fluid and a solid surface has a great importance in many fields, both in adiabatic conditions and when heat transfer is involved. To investigate the behavior of many drops in Contact with a surface, the first step is to study a single one of them and in that, surface wettability is key parameter. Wettability analyses are usually performed by Contact Angle Measurement, in most cases using the sessile drop or captive bubble techniques. Such techniques require optical acquisition of a side view of the drop or bubble, with a series of drawbacks when conventional optics are used, in particular for not uniform, not planar or rough base surfaces. X-ray micro-computed tomography is therefore used to acquire a 3D scan of a drop gently deposited on a surface, with the aim to reconstruct the drop surface and to perform Contact Angle Measurements on true cross-sections of the drop-surface couple. Comparison with Contact Angle Measurements performed on conventional images is performed. The results evidence that the proposed technique is very promising for surface characterization and to get more accurate and detailed information about wettability characteristics.

  • drop shape visualization and Contact Angle Measurement on curved surfaces
    Journal of Colloid and Interface Science, 2011
    Co-Authors: Manfredo Guilizzoni
    Abstract:

    Abstract The shape and Contact Angles of drops on curved surfaces is experimentally investigated. Image processing, spline fitting and numerical integration are used to extract the drop contour in a number of cross-sections. The three-dimensional surfaces which describe the surface–air and drop–air interfaces can be visualized and a simple procedure to determine the equilibrium Contact Angle starting from Measurements on curved surfaces is proposed. Contact Angles on flat surfaces serve as a reference term and a procedure to measure them is proposed. Such procedure is not as accurate as the axisymmetric drop shape analysis algorithms, but it has the advantage of requiring only a side view of the drop–surface couple and no further information. It can therefore be used also for fluids with unknown surface tension and there is no need to measure the drop volume. Examples of application of the proposed techniques for distilled water drops on gemstones confirm that they can be useful for drop shape analysis and Contact Angle Measurement on three-dimensional sculptured surfaces.

Yukou Du - One of the best experts on this subject based on the ideXlab platform.

  • cyclic voltammetry and Contact Angle Measurement studies of the mo vi ions doped tio2 thin films
    Materials Chemistry and Physics, 2007
    Co-Authors: Yukou Du, Ping Yang, Zou Cuie
    Abstract:

    Abstract Undoped and Mo(VI) ions doped TiO2 thin films were prepared via sol–gel method on different substrates. The morphology and the crystalline structures of the thin films were studied by SEM and XRD. The UV light inducing hydrophilicity was improved by doping Mo(VI) ions. The influence of the dopant density on the photo-induced superhydrophilicity of the films was investigated using cyclic voltammetry. A new oxidation peak was observed at about 0.17 V when the TiO2 electrodes were irradiated by UV light for a certain time. The peak current increased with the irradiation time. To reach the same peak current, 0.75% Mo(VI) ions doped films required short time than the undoped film.

Stephanie Festsantini - One of the best experts on this subject based on the ideXlab platform.

  • x ray computed microtomography for drop shape analysis and Contact Angle Measurement
    Journal of Colloid and Interface Science, 2013
    Co-Authors: Maurizio Santini, Manfredo Guilizzoni, Stephanie Festsantini
    Abstract:

    The interaction between an atomized fluid and a solid surface has a great importance in many fields, both in adiabatic conditions and when heat transfer is involved. To investigate the behavior of many drops in Contact with a surface, the first step is to study a single one of them and in that, surface wettability is key parameter. Wettability analyses are usually performed by Contact Angle Measurement, in most cases using the sessile drop or captive bubble techniques. Such techniques require optical acquisition of a side view of the drop or bubble, with a series of drawbacks when conventional optics are used, in particular for not uniform, not planar or rough base surfaces. X-ray micro-computed tomography is therefore used to acquire a 3D scan of a drop gently deposited on a surface, with the aim to reconstruct the drop surface and to perform Contact Angle Measurements on true cross-sections of the drop-surface couple. Comparison with Contact Angle Measurements performed on conventional images is performed. The results evidence that the proposed technique is very promising for surface characterization and to get more accurate and detailed information about wettability characteristics.

Xue-mei Wang - One of the best experts on this subject based on the ideXlab platform.

  • Probing Cellular Binding of Dendrofullerene by in‐situ Electrochemical Contact Angle Measurement
    Chinese Journal of Chemistry, 2008
    Co-Authors: Jian Zhou, Ren Yun Zhang, Xue Yan Zhao, De Gang Fu, Li-qiang Zheng, Chun-hui Wu, Bao-an Chen, Xue-mei Wang
    Abstract:

    Dendrofullerene (C60DF) is a novel fullerene derivative with potential and promising biomedical applications. In this work, electrochemical/Contact Angle behavior of C60DF in the cellular system has been explored by in-situ electrochemical Contact Angle Measurement. This measuring system is a newly developed technique which can provide electrochemical and Contact Angle detection simultaneously. The electrochemical results indicate that dendrofullerene may effectively bind and permeate the tumor cell membrane and then distribute into the cancer cells. Our observations of in-situ electrochemical Contact Angle Measurement also illustrate that the permeation and interaction of C60DF with target cancer cells may lead to some variation of the configurational structure of the relative cell membrane and thus result in the change of hydrophilic/hydrophobic properties of target cellular system. Furthermore, through confocus fluorescence microscopy study we found that, upon application of C60DF, the intracellular accumulation of anticancer drug daunorubicin in leukemia K562 cells could be remarkably enhanced by C60DF. Therefore fullerene derivatives were demonstrated to be a good candidate that can play an important role in improving the intracellular drug uptake in the target cancer cells.

  • Probing cellular binding of dendrofullerene by in-situ electrochemical Contact Angle Measurement
    Chinese Journal of Chemistry, 2008
    Co-Authors: Jian Zhou, Ren Yun Zhang, Xue Yan Zhao, De Gang Fu, Li-qiang Zheng, Chun-hui Wu, Bao-an Chen, Xue-mei Wang
    Abstract:

    Dendrofullerene (C 60 DF) is a novel fullerene derivative with potential and promising biomedical applications. In this work, electrochemical/Contact Angle behavior of C 60 DF in the cellular system has been explored by in-situ electrochemical Contact Angle Measurement. This measuring system is a newly developed technique which can provide electrochemical and Contact Angle detection simultaneously. The electrochemical results indicate that dendrofullerene may effectively bind and permeate the tumor cell membrane and then distribute into the cancer cells. Our observations of in-situ electrochemical Contact Angle Measurement also illustrate that the permeation and interaction of C 60 DF with target cancer cells may lead to some variation of the configurational structure of the relative cell membrane and thus result in the change of hydrophilic/hydrophobic properties of target cellular system. Furthermore, through confocus fluorescence microscopy study we found that, upon application of C 60 DF, the intracellular accumulation of anticancer drug daunorubicin in leukemia K562 cells could be remarkably enhanced by C 60 DF. Therefore fullerene derivatives were demonstrated to be a good candidate that can play an important role in improving the intracellular drug uptake in the target cancer cells. © 2008 SIOC, CAS, & Wiley-VCH Verlag GmbH & Co. KGaA.

  • Magnetic controllable biorecognition process of doxorubicin detected by electrochemical Contact Angle Measurement.
    Journal of Nanoscience and Nanotechnology, 2007
    Co-Authors: Jian Zhou, Ren Yun Zhang, Xiaomao Li, Sebastian Gutmann, Gang Lv, Xue-mei Wang
    Abstract:

    : Fe3O4 nanoparticles are the most commonly used magnetic materials with promising applications in biomedical and biochemical engineering. In this study, a novel application of the tetraheptylammonium capped Fe3O4 nanoparticles in controllable biorecognition process of anticancer drug doxorubicin through combination with external static magnetic field has been demonstrated. Our AFM and electrochemical studies illustrate that the presence of the tetraheptylammonium capped Fe3O4 nanoparticles could promote the binding behavior of doxorubicin to DNA. And the results of the electrochemical Contact Angle Measurements indicate that the controllable biomolecular recognition of doxorubicin could be readily achieved by combining these functionalized Fe3O4 nanoparticles with changing the positions of external magnetic field.

Yashiaki Nakano - One of the best experts on this subject based on the ideXlab platform.

  • Wafer surface treatment for bonding GaInAsP and magnetooptic garnet
    LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting, 1999
    Co-Authors: Tetsuya Mizumoto, T. Waniishi, Naoki Futakuchi, Noriaki Kaida, Hiroshi Yokoi, Masaru Shimizu, Yashiaki Nakano
    Abstract:

    GaInAsP surfaces were investigated by Contact Angle Measurement to estimate their hydrophilicity for completing wafer direct bonding with magnetooptic garnet. Wafer direct bonding was successfully achieved between O2 plasma activated GaInAsP and garnet crystals. This technique has been applied with the aim of integrating a laser diode and an optical isolator

  • Contact Angle Measurement of GaInAsP surfaces for wafer direct bonding with garnet crystals
    Technical Digest. CLEO Pacific Rim '99. Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.99TH8464), 1999
    Co-Authors: Hiroshi Yokoi, T. Waniishi, Naoki Futakuchi, Noriaki Kaida, Masaru Shimizu, Tetsuya Mizumoto, Yashiaki Nakano
    Abstract:

    GaInAsP surfaces were investigated by Contact Angle Measurement of a water droplet to estimate their hydrophilicity. The most hydrophilic surface of GaInAsP was obtained by the O/sub 2/ plasma activation process. Wafer direct bonding was successfully achieved between O/sub 2/ plasma activated GaInAsP and garnet crystals.

  • Wafer surface treatment for integrating laser diode and optical isolator by direct bonding
    Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference on Communications, 1999
    Co-Authors: Tetsuya Mizumoto, T. Waniishi, Naoki Futakuchi, Noriaki Kaida, Hiroshi Yokoi, Masaru Shimizu, Yashiaki Nakano
    Abstract:

    GaInAsP surfaces were investigated by Contact Angle Measurement to estimate their hydrophilicity for completing wafer direct bonding. Wafer direct bonding was successfully achieved between O/sub 2/ plasma activated GaInAsP and garnet crystals.