The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform

Ravi F. Saraf - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous Printing of Two Inks by Contact Lithography.
    ACS applied materials & interfaces, 2018
    Co-Authors: David Moore, Ravi F. Saraf
    Abstract:

    Microcontact printing (μCP) is a valuable technique used to fabricate complex patterns on surfaces for applications such as sensors, cell seeding, self-assembled monolayers of proteins and nanoparticles, and micromachining. The process is very precise but is typically confined to depositing a single type of ink per print, which limits the complexity of using multifunctionality patterns. Here we describe a process by which two inks are printed concomitantly in a single operation to create an alternating pattern of hydrophobic and hydrophilic characteristics. The hydrophobic ink, PDMS, is deposited by evaporation on the Noncontact Region, while the hydrophilic polyelectrolyte is transferred on contact. We demonstrate that there is no gap between the two patterns using an optical-electrochemical method. We describe some potential applications of this method, including layer-by-layer deposition of polyelectrolytes for sensors and creation of a scaffold for cell culture.

  • Simultaneous Printing of Two Inks by Contact Lithography
    2018
    Co-Authors: David Moore, Ravi F. Saraf
    Abstract:

    Microcontact printing (μCP) is a valuable technique used to fabricate complex patterns on surfaces for applications such as sensors, cell seeding, self-assembled monolayers of proteins and nanoparticles, and micromachining. The process is very precise but is typically confined to depositing a single type of ink per print, which limits the complexity of using multifunctionality patterns. Here we describe a process by which two inks are printed concomitantly in a single operation to create an alternating pattern of hydrophobic and hydrophilic characteristics. The hydrophobic ink, PDMS, is deposited by evaporation on the Noncontact Region, while the hydrophilic polyelectrolyte is transferred on contact. We demonstrate that there is no gap between the two patterns using an optical–electrochemical method. We describe some potential applications of this method, including layer-by-layer deposition of polyelectrolytes for sensors and creation of a scaffold for cell culture

Bernard Drevillon - One of the best experts on this subject based on the ideXlab platform.

  • Study of the mechanical behavior of plasma-deposited silica films on polycarbonate and steel
    Journal of Vacuum Science & Technology A: Vacuum Surfaces and Films, 2000
    Co-Authors: Alfred Hofrichter, Andrei Constantinescu, S. Benayoun, Pavel Bulkin, Bernard Drevillon
    Abstract:

    In the present study, we deposited amorphous hydrogenated silicon oxide films on polycarbonate, stainless steel, and silicon by plasma enhanced chemical vapor deposition using a low pressure, high density integrated distributed electron cyclotron resonance plasma reactor. Substrate curvature, vibrating slab, and Vickers indentation experiments were used to evaluate the intrinsic stress, the Young modulus of the films, and the composite hardness of the film–substrate system. The indentation experiments were modeled by finite element analysis and the calculated values were compared to experimentally measured hardness values. A reasonable accordance with the experiment was found both for stainless-steel and polycarbonate substrates, indicating that the modeling is valid and may be used to enhance the interpretation of the indentation experiments. The calculations show an important bending of the film in the Noncontact Region in the case of a Vickers indentation on a coated polycarbonate sample. The analysis ...

  • Study of the mechanical behaviour of plasma deposited silica films on polycarbonates and steel
    Journal of Vacuum Science and Technology A, 2000
    Co-Authors: Alfred Hofrichter, Andrei Constantinescu, Pavel Bulkin, S. Benayon, Bernard Drevillon
    Abstract:

    In the present study, we deposited amorphous hydrogenated silicon oxide films on polycarbonate, stainless steel, and silicon by plasma enhanced chemical vapor deposition using a low pressure, high density integrated distributed electron cyclotron resonance plasma reactor. Substrate curvature, vibrating slab, and Vickers indentation experiments were used to evaluate the intrinsic stress, the Young modulus of the films, and the composite hardness of the film–substrate system. The indentation experiments were modeled by finite element analysis and the calculated values were compared to experimentally measured hardness values. A reasonable accordance with the experiment was found both for stainless-steel and polycarbonate substrates, indicating that the modeling is valid and may be used to enhance the interpretation of the indentation experiments. The calculations show an important bending of the film in the Noncontact Region in the case of a Vickers indentation on a coated polycarbonate sample. The analysis of the thus-induced strain distribution in the coating indicates that the measured diagonal might be overestimated and not representative of the real contact area. The calculations indicate that the yield limit of the plasma-deposited silica films is of about 4 GPa.

David Moore - One of the best experts on this subject based on the ideXlab platform.

  • Simultaneous Printing of Two Inks by Contact Lithography.
    ACS applied materials & interfaces, 2018
    Co-Authors: David Moore, Ravi F. Saraf
    Abstract:

    Microcontact printing (μCP) is a valuable technique used to fabricate complex patterns on surfaces for applications such as sensors, cell seeding, self-assembled monolayers of proteins and nanoparticles, and micromachining. The process is very precise but is typically confined to depositing a single type of ink per print, which limits the complexity of using multifunctionality patterns. Here we describe a process by which two inks are printed concomitantly in a single operation to create an alternating pattern of hydrophobic and hydrophilic characteristics. The hydrophobic ink, PDMS, is deposited by evaporation on the Noncontact Region, while the hydrophilic polyelectrolyte is transferred on contact. We demonstrate that there is no gap between the two patterns using an optical-electrochemical method. We describe some potential applications of this method, including layer-by-layer deposition of polyelectrolytes for sensors and creation of a scaffold for cell culture.

  • Simultaneous Printing of Two Inks by Contact Lithography
    2018
    Co-Authors: David Moore, Ravi F. Saraf
    Abstract:

    Microcontact printing (μCP) is a valuable technique used to fabricate complex patterns on surfaces for applications such as sensors, cell seeding, self-assembled monolayers of proteins and nanoparticles, and micromachining. The process is very precise but is typically confined to depositing a single type of ink per print, which limits the complexity of using multifunctionality patterns. Here we describe a process by which two inks are printed concomitantly in a single operation to create an alternating pattern of hydrophobic and hydrophilic characteristics. The hydrophobic ink, PDMS, is deposited by evaporation on the Noncontact Region, while the hydrophilic polyelectrolyte is transferred on contact. We demonstrate that there is no gap between the two patterns using an optical–electrochemical method. We describe some potential applications of this method, including layer-by-layer deposition of polyelectrolytes for sensors and creation of a scaffold for cell culture

Alfred Hofrichter - One of the best experts on this subject based on the ideXlab platform.

  • Study of the mechanical behavior of plasma-deposited silica films on polycarbonate and steel
    Journal of Vacuum Science & Technology A: Vacuum Surfaces and Films, 2000
    Co-Authors: Alfred Hofrichter, Andrei Constantinescu, S. Benayoun, Pavel Bulkin, Bernard Drevillon
    Abstract:

    In the present study, we deposited amorphous hydrogenated silicon oxide films on polycarbonate, stainless steel, and silicon by plasma enhanced chemical vapor deposition using a low pressure, high density integrated distributed electron cyclotron resonance plasma reactor. Substrate curvature, vibrating slab, and Vickers indentation experiments were used to evaluate the intrinsic stress, the Young modulus of the films, and the composite hardness of the film–substrate system. The indentation experiments were modeled by finite element analysis and the calculated values were compared to experimentally measured hardness values. A reasonable accordance with the experiment was found both for stainless-steel and polycarbonate substrates, indicating that the modeling is valid and may be used to enhance the interpretation of the indentation experiments. The calculations show an important bending of the film in the Noncontact Region in the case of a Vickers indentation on a coated polycarbonate sample. The analysis ...

  • Study of the mechanical behaviour of plasma deposited silica films on polycarbonates and steel
    Journal of Vacuum Science and Technology A, 2000
    Co-Authors: Alfred Hofrichter, Andrei Constantinescu, Pavel Bulkin, S. Benayon, Bernard Drevillon
    Abstract:

    In the present study, we deposited amorphous hydrogenated silicon oxide films on polycarbonate, stainless steel, and silicon by plasma enhanced chemical vapor deposition using a low pressure, high density integrated distributed electron cyclotron resonance plasma reactor. Substrate curvature, vibrating slab, and Vickers indentation experiments were used to evaluate the intrinsic stress, the Young modulus of the films, and the composite hardness of the film–substrate system. The indentation experiments were modeled by finite element analysis and the calculated values were compared to experimentally measured hardness values. A reasonable accordance with the experiment was found both for stainless-steel and polycarbonate substrates, indicating that the modeling is valid and may be used to enhance the interpretation of the indentation experiments. The calculations show an important bending of the film in the Noncontact Region in the case of a Vickers indentation on a coated polycarbonate sample. The analysis of the thus-induced strain distribution in the coating indicates that the measured diagonal might be overestimated and not representative of the real contact area. The calculations indicate that the yield limit of the plasma-deposited silica films is of about 4 GPa.

Bruce H Smaill - One of the best experts on this subject based on the ideXlab platform.

  • atrial electro anatomic mapping with a novel Noncontact approach
    Computing in Cardiology Conference, 2017
    Co-Authors: S Meng, Jichao Zhao, I Legrice, N Lever, Gregory B Sands, Laura Bear, Anne M Gillis, Bruce H Smaill
    Abstract:

    Multi-electrode basket catheters are used for 3D mapping of complex focal arrhythmias in real-time, but full contact is hard to achieve for all electrodes in the atria. We have developed a novel inverse mapping approach, which enables endocardial potentials to be recovered from Noncontact recordings and report on its efficacy. Intra-atrial electrograms were acquired with 64 channel Constellation™ catheters in 4 anesthetized sheep in sinus rhythm (SR), atrial pacing (AP) and atrial fibrillation (AF), with catheters of different dimension at various locations in right and/or left atria (RA, LA). Atrial endocardial potentials were recovered from Noncontact recordings using finite-element and meshless inverse methods. Inverse mapping reproduced contact electrograms, recorded separately at distributed sites, with excellent accuracy in SR and AP [CC 0.8+0.18, time delay 1+3 ms, relative RMS error 0.53+0.17, n=96]. Moreover, repeatable activation time maps were obtained in SR and AP. Focal activity was identified in AF and precise Noncontact Region-of-interest mapping was also demonstrated.

  • CinC - Atrial electro-anatomic mapping with a novel Noncontact approach
    2017 Computing in Cardiology Conference (CinC), 2017
    Co-Authors: S Meng, Jichao Zhao, I Legrice, N Lever, Gregory B Sands, Laura Bear, Anne M Gillis, Bruce H Smaill
    Abstract:

    Multi-electrode basket catheters are used for 3D mapping of complex focal arrhythmias in real-time, but full contact is hard to achieve for all electrodes in the atria. We have developed a novel inverse mapping approach, which enables endocardial potentials to be recovered from Noncontact recordings and report on its efficacy. Intra-atrial electrograms were acquired with 64 channel Constellation™ catheters in 4 anesthetized sheep in sinus rhythm (SR), atrial pacing (AP) and atrial fibrillation (AF), with catheters of different dimension at various locations in right and/or left atria (RA, LA). Atrial endocardial potentials were recovered from Noncontact recordings using finite-element and meshless inverse methods. Inverse mapping reproduced contact electrograms, recorded separately at distributed sites, with excellent accuracy in SR and AP [CC 0.8+0.18, time delay 1+3 ms, relative RMS error 0.53+0.17, n=96]. Moreover, repeatable activation time maps were obtained in SR and AP. Focal activity was identified in AF and precise Noncontact Region-of-interest mapping was also demonstrated.