Chemical and biological effects of low pressure N2-O2 plasma setup on polymeric materials

2019 ◽  
Vol 39 (4) ◽  
pp. 309-315 ◽  
Author(s):  
Omar Mrad ◽  
Saker Saloum ◽  
Ayman Al-Mariri ◽  
Iyas M. Ismail
Keyword(s):  
Biological Effects ◽  
Polymeric Materials ◽  
Careful Analysis ◽  
Low Pressure ◽  
Discharge System ◽  
X Ray ◽  
Complete Inactivation ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
O2 Plasma

Abstract The effects of low-pressure RF N2-O2 plasma produced using a 13.56 MHz hollow cathode discharge system on the polymeric materials in terms of both biological and chemical sides are studied. A complete inactivation of most of the studied bacteria has occurred within 30 min. However, this treatment caused an increase of the surface hydrophilicity, as manifested by the contact angle measurements. This increase was explained by the formation of the N and O functionalities revealed by the X-ray photoelectron technique analysis. A careful analysis of the high-resolution C 1s peak has also revealed some variations on the C–C, C–O and O=C– bonds and the emergence of a new C-N bond.

scholarly journals Wood-Mimicking Bio-Based Biporous Polymeric Materials with Anisotropic Tubular Macropores

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2692
Author(s):  
Vierajitha Srikanthan ◽  
Olivier Pitois ◽  
Philippe Coussot ◽  
Benjamin Le Droumaguet ◽  
Daniel Grande
Keyword(s):  
Structural Parameters ◽  
Crosslinking Agent ◽  
Polymeric Materials ◽  
Material Surface ◽  
Water Contact ◽  
X Ray ◽  
Angle Measurements ◽  
Flow Transport ◽  
Contact Angle Measurements ◽  
Physical Phenomena

Understanding physical phenomena related to fluid flow transport in plants and especially through wood is still a major challenge for the scientific community. To this end, we have focused our attention on the design of wood-mimicking polymeric architectures through a strategy based on the double porogen templating approach which relies on the use of two distinct types of porogens, namely aligned nylon threads and a porogenic solvent, to produce macro- and nanoporosity levels, respectively. A bio-based phenolic functional monomer, i.e., vanillin methacrylate, was employed to mimic either hard wood or soft wood. Upon free-radical polymerization with a crosslinking agent in the presence of both types of porogenic agents, followed by their removal, biporous materials with anistotropic tubular macropores surrounded by a nanoporous matrix were obtained. They were further fully characterized in terms of porosity and chemical composition via mercury intrusion porosimetry, scanning electron microscopy and X-ray microtomography. It was demonstrated that the two porosity levels could be independently tuned by varying structural parameters. Further, the possibility to chemically modify the pore surface and thus to vary the material surface properties was successfully demonstrated by reductive amination with model compounds via Raman spectroscopy and water contact angle measurements.

scholarly journals Surface Modification of the Alloy Ti-7.5Mo by Anodization for Biomedical Applications

2016 ◽  
Vol 869 ◽  
pp. 913-917 ◽  
Author(s):  
Ana Lucia do Amaral Escada ◽  
Javier Andres Muñoz Chaves ◽  
Ana Paula Rosifini Alves Claro
Keyword(s):  
Contact Angle ◽  
Electron Microscope ◽  
Biomedical Applications ◽  
Anatase Phase ◽  
Ammonium Fluoride ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Simple Surface ◽  
Scanning Electron

The purpose of this study was to evaluate the TiO2 nanotubes growth and the variation in its diameter to improve the surface properties of Ti-7.5Mo to use for biomedical applications. For the nanotubes TiO2 growth, the samples were anodized in glycerol and ammonium fluoride and divided according to the anodizing potential at 5V to 10V and 24 hour time. The surfaces were examined by scanning electron microscope (SEM), X-ray analysis (XRD) and contact angle measurements. The average tube diameter, ranging in size from 13 to 23 nm, was found to increase with increasing anodizing voltage. It was also observed a decrease in contact angle in accordance with the increase in the anodizing potential. The X-ray analysis showed the presence of anatase phase in samples whose potential was 10V and this condition represents a simple surface treatment for Ti-7.5Mo alloy that has high potential for biomedical applications.

Effect of electron irradiation on the Crystallite size, Grain size and Contact angle of electrodeposited Cadmium Telluride thin films

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
S. A. Gangawane ◽  
V. P. Malekar ◽  
V. J. Fulari
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Grain Size ◽  
Electron Beam Irradiation ◽  
Crystal Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Cdte Thin Films

In this paper, the effects of electron beam irradiation on the CdTe thin films are studied. The CdTe thin films are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and contact angle measurements for different bath concentration. The thin film layers are subjected to irradiation of 6 MeV electrons. Finally the effect of irradiation is correlated to crystal size, grain size and contact angle measurements of the CdTe thin films

Preparation of N, O-Carboxymethyl Chitosan with Different Substitutional Degree and its Application for Hemostasis

2013 ◽  
Vol 798-799 ◽  
pp. 1061-1066 ◽  
Author(s):  
Yan Wei Zhao ◽  
Lu Liu ◽  
Xiang Han ◽  
Jing Guan
Keyword(s):  
Carboxymethyl Chitosan ◽  
X Ray Diffraction ◽  
Clotting Time ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Ft Ir ◽  
Ubbelohde Viscometer

We prepared N, O-carboxymethyl chitosans (CMCSs) with different substitutional degrees (SDs) to evaluate their effects of hemostasis, and provided experimental basis on biomedical materials. Chloroethanoic acid was used to synthesize CMCSs. The structure were characterized by Fourier transform infrared (FT-IR) and wide-angle X-ray diffraction (WXRD). Potentiometric titration and Ubbelohde viscometer were adopted to determine the SD and intrinsic viscosity of CMCSs. Contact angle measurements were investigated to determine surface wettability. Method of dynamic clotting time and coagulation test in vivo were used to evaluate their effects of hemostasis. SDs of CMCSs were from 50% to 110%. As the SD increased, molecular weight decreased. CMCS powder with SD 63% possessed excellent hemostasis both in vitro and in vivo. CMCS powder owned hemostatic capability prior to CS. CMCS powder with SD 63% (neither too high, nor too low) possessed excellent hemostasis both in vitro and in vivo.

scholarly journals Synthesis and Deposition of Thermochromic VO2 Thin Films from Peroxide-based Chemical Solutions

2021 ◽  
Author(s):  
Matthias Van Zele ◽  
Hannes Rijckaert ◽  
Davy Deduytsche ◽  
Christophe Detavernier ◽  
Isabel Van Driessche ◽  
...  
Keyword(s):  
Coating Thickness ◽  
Optical Transmission ◽  
Solar Modulation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Thermochromic Properties ◽  
Chemical Solutions ◽  
Vo2 Thin Films

In this paper, a novel synthesis for a chemical precursor for nanocrystalline VO2 coatings is elaborated. The compatibility of the precursor towards the substrate is optimized for spin coating. This is done by subjecting multiple solvents to contact angle measurements. A suitable thermal treatment is developed to densify the coating and to induce crystallization. Afterwards the microstructure of the coating is investigated using X-Ray diffraction, electron microscopy and ellipsometry techniques. To assess the thermochromic properties of the fabricated device, optical transmission experiments were conducted both at room temperature and at elevated temperature. A correlation between these thermochromic properties and coating thickness was investigated in order to obtain an optimized thermochromic device, where both high visual transparency and prominent thermochromic switching abilities are aimed for. In this work, an optimal coating thickness is proposed for a thermochromic coating with high switching ability and solar modulation.

scholarly journals The Sensitivity of Estimates of Multiphase Fluid and Solid Properties of Porous Rocks to Image Processing

2019 ◽  
Vol 131 (3) ◽  
pp. 985-1005 ◽  
Author(s):  
Gaetano Garfi ◽  
Cédric M. John ◽  
Steffen Berg ◽  
Samuel Krevor
Keyword(s):  
Image Processing ◽  
Contact Angle ◽  
Surface Area ◽  
Single Phase ◽  
Phase Flow ◽  
Single Phase Flow ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements

AbstractX-ray microcomputed tomography (X-ray μ-CT) is a rapidly advancing technology that has been successfully employed to study flow phenomena in porous media. It offers an alternative approach to core scale experiments for the estimation of traditional petrophysical properties such as porosity and single-phase flow permeability. It can also be used to investigate properties that control multiphase flow such as rock wettability or mineral topology. In most applications, analyses are performed on segmented images obtained employing a specific processing pipeline on the greyscale images. The workflow leading to a segmented image is not straightforward or unique and, for most of the properties of interest, a ground truth is not available. For this reason, it is crucial to understand how image processing choices control properties estimation. In this work, we assess the sensitivity of porosity, permeability, specific surface area, in situ contact angle measurements, fluid–fluid interfacial curvature measurements and mineral composition to processing choices. We compare the results obtained upon the employment of two processing pipelines: non-local means filtering followed by watershed segmentation; segmentation by a manually trained random forest classifier. Single-phase flow permeability, in situ contact angle measurements and mineral-to-pore total surface area are the most sensitive properties, as a result of the sensitivity to processing of the phase boundary identification task. Porosity, interfacial fluid–fluid curvature and specific mineral descriptors are robust to processing. The sensitivity of the property estimates increases with the complexity of its definition and its relationship to boundary shape.

Surface Treatments of Titanium Alloy for Preparing Laminated Composite Material

2015 ◽  
Vol 1101 ◽  
pp. 229-232 ◽  
Author(s):  
Svetlana Vladimirovna Sibileva ◽  
Andrey Leonidovich Botanogov ◽  
Nikolay Vadimovich Trofimov ◽  
Ludmila Viktorovna Zaharova
Keyword(s):  
Titanium Alloy ◽  
Laminated Composite ◽  
Adhesive Bond ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Alloy Vt20 ◽  
Before And After ◽  
Laminated Composite Material

In this investigation surface treatment of titanium alloy VT20 is carried out by phosphating and anodization in order to increase the adhesive bond strength. The surfaces were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), profilometry, contact angle measurements. The joined titanium specimens were shear tested before and after exposure to high humidity to a period of three months.

Nanotubes Growth on Ti-15Mo Alloys by Anodization at Low Voltage

2016 ◽  
Vol 869 ◽  
pp. 924-929 ◽  
Author(s):  
André Luiz Reis Rangel ◽  
Guilherme Rogeri Moreira Santos ◽  
Ana Paula Rosifini Alves Claro
Keyword(s):  
Positive Characteristic ◽  
Low Voltage ◽  
Ammonium Fluoride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Biological Environment ◽  
Post Implantation ◽  
Microscopy Images

Surface modification by nanotubes growth is an efficient technique to improve the interaction between implant and biological environment. Several studies indicate who low voltages anodizations are able to generate nanotubes with smaller diameters, positive characteristic for the post-implantation cell growth. The aim of this study was to characterize the morphology of the nanotubes formed on Ti-15Mo surfaces applying 5 or 10 V as anodizing voltage. For both conditions were used glycerol based electrolyte with ammonium fluoride and the anodization time was 24 hours. The samples were cleaned in an ultrasonic bath and annealed at 450 ° for 1 hour after anodization. In order to characterize the surfaces were performed scanning electron microscopy images, contact angle measurements and X-ray diffraction analysis. The results confirmed the formation of nanotubes evenly distributed on the surfaces and a direct relation between anodizing voltage and nanotubes diameters.

Studying Effects of Bias Voltage on Properties, Wettability and Platelet Adhered Behavior of DLC Films Prepared By DC-MFCVAD

2007 ◽  
Vol 353-358 ◽  
pp. 2203-2206
Author(s):  
Feng Wen ◽  
Nan Huang ◽  
Yong Xiang Leng ◽  
Zhi Li ◽  
Yang Cao
Keyword(s):  
Bias Voltage ◽  
Biomedical Applications ◽  
Vacuum Arc ◽  
X Ray ◽  
Magnetic Filter ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Vacuum Arc Deposition ◽  
Scratch Tests ◽  
Arc Deposition

Diamond-Like carbon (DLC) films were prepared under different bias voltage by direct current magnetic filter cathode vacuum arc deposition (DC-MFCVAD). Bias voltages changed from 0 to -200 V. The study intends to investigate the effect on the properties of DLC films for biomedical applications. X-ray photoelectron spectrum (XPS) was used to investigate composition of the films. Nano-scratch tests were used to characterize effects of bias voltage to adhesion. Furthermore, the wettability of the DLC films was investigated by contact angle measurements using four common liquids. Finally, platelet adhesion experiments were done to evaluate the interaction of blood with DLC films. The results showed that the adhesion, wettability and hemo-compatibility of DLC films were affected by bias voltage.

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