Quantitative Investigation of the Photodegradation of Polyethylene Terephthalate Film by Friction Force Microscopy, Contact-Angle Goniometry, and X-ray Photoelectron Spectroscopy

2009 ◽  
Vol 1 (8) ◽  
pp. 1688-1697 ◽  
Author(s):  
Claire R. Hurley ◽  
Graham J. Leggett
Keyword(s):  
Contact Angle ◽  
Polyethylene Terephthalate ◽  
Friction Force ◽  
Photoelectron Spectroscopy ◽  
Friction Force Microscopy ◽  
Quantitative Investigation ◽  
Polyethylene Terephthalate Film ◽  
X Ray ◽  
Force Microscopy

Ozone-Induced Immobilization of Chitosan and Heparin on Polyethylene Terephthalate Films to Improve Antithrombogenic Properties

2007 ◽  
Vol 342-343 ◽  
pp. 809-812 ◽  
Author(s):  
Jian Xin Li ◽  
Jin Wang ◽  
Peng Li ◽  
Ya Jun Weng ◽  
Ling Ren ◽  
...  
Keyword(s):  
Contact Angle ◽  
Polyethylene Terephthalate ◽  
Photoelectron Spectroscopy ◽  
Platelet Rich Plasma ◽  
Static Contact Angle ◽  
Adhesion Test ◽  
Artificial Blood ◽  
X Ray ◽  
Static Contact ◽  
Pet Films

of artificial blood catheters. This paper describes the immobilization of chitosan and heparin molecules on polyethylene terephthalate (PET) films by ozonization. The concentration of peroxide groups (-OOH) was 1.72 × 10-7 mol/cm2 on the PET surface oxidized by ozonization. The results of X-ray photoelectron spectroscopy (XPS) indicate that chains of chitosan and heparin were successfully immobilized on the PET films. The static contact angle(STA) of water decreases from 83.5° to 68.3° by immobilization of chitosan and heparin, which means that the hydrophilic properties of the modified PET is improved. The antithrombogenic property of PET surface was evaluated by a platelet-rich plasma (PRP) adhesion test. The results indicate that the number of platelet adhered on the modified-PET surface incubated with PRP for 240 min decreased significantly and platelets did not aggregate and distort.

scholarly journals Inhibition mechanism of Ca 2+ , Mg 2+ and Fe 3+ in fine cassiterite flotation using octanohydroxamic acid

2018 ◽  
Vol 5 (8) ◽  
pp. 180158 ◽  
Author(s):  
Liuyi Ren ◽  
Hang Qiu ◽  
Wenqing Qin ◽  
Ming Zhang ◽  
Yubiao Li ◽  
...  
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Chemical Properties ◽  
Solution Chemistry ◽  
Inhibition Mechanism ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Afm Imaging ◽  
Flotation Performance

The existence of metal ions should not be ignored in both hydrometallurgy and flotation. In this study, the effects of Ca 2+ , Mg 2+ and Fe 3+ on the flotation performance of cassiterite using octanohydroxamic acid (OHA) as the collector were investigated by micro-flotation tests, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, contact angle, zeta ( ζ ) potential measurements and atomic force microscopy (AFM) imaging. The results of the flotation and contact angle experiments showed that the addition of Ca 2+ , Mg 2+ and Fe 3+ significantly decreased both the recovery and contact angle of cassiterite with pH ranged from 6.0 to 12.0 in the presence of OHA collector. ζ- Potential measurements, solution chemistry analysis and FTIR measurements indicated that the flotation recovery of the cassiterite declined due to the CaOH + , MgOH + and Fe(OH) 3 sites on the cassiterite surface. XPS results indicated that the chemisorption of OHA and calcium ions on the cassiterite surface finally changed its chemical properties. The AFM images also revealed that new species Fe(OH) 3 of Fe 3+ formed and adsorbed on the cassiterite surface at pH 9.0. The adsorption of Fe(OH) 3 reduced the adsorption of OHA on the cassiterite surface, thus the hydrophobicity of cassiterite was deteriorated.

scholarly journals Surface Modification of Polyethersulfone (PES) with UV Photo-Oxidation

Technologies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 36
Author(s):  
Ibrahim Cisse ◽  
Sarah Oakes ◽  
Shreen Sachdev ◽  
Marc Toro ◽  
Shin Lutondo ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Atomic Force Microscopy ◽  
Photoelectron Spectroscopy ◽  
Water Contact ◽  
X Ray ◽  
Force Microscopy ◽  
Photo Oxidation ◽  
Atomic Force ◽  
Modified Surfaces

Polyethersulfone (PES) films are widely employed in the construction of membranes where there is a desire to make the surface more hydrophilic. Therefore, UV photo-oxidation was studied in order to oxidize the surface of PES and increase hydrophilicity. UV photo-oxidation using low pressure mercury lamps emitting both 253.7 and 184.9 nm radiation were compared with only 253.7 nm photons. The modified surfaces were characterized using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle (WCA) measurements. Both sets of lamps gave similar results, showing an increase of the oxygen concentration up to a saturation level of ca. 29 at.% and a decrease in the WCA, i.e., an increase in hydrophilicity, down to ca. 40°. XPS detected a decrease of sp2 C-C aromatic group bonding and an increase in the formation of C-O, C=O, O=C-O, O=C-OH, O-(C=O)-O, and sulphonate and sulphate moieties. Since little change in surface roughness was observed by AFM, the oxidation of the surface caused the increase in hydrophilicity.

scholarly journals Advantages and Limitations of Surface Analysis Techniques on Plasma-Treated Arabidopsis thaliana Seeds

2021 ◽  
Vol 8 ◽  
Author(s):  
Alexandra Waskow ◽  
Alan Howling ◽  
Ivo Furno
Keyword(s):  
Contact Angle ◽  
Arabidopsis Thaliana ◽  
Surface Analysis ◽  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Attenuated Total Reflection ◽  
X Ray ◽  
Force Microscopy ◽  
Analysis Techniques ◽  
Surface Analysis Techniques

Surface characterization of plasma-treated seeds has made significant progress over the last decade. Most papers in the literature use scanning electron microscopy (SEM) and contact angle goniometry to investigate surface modifications. However, very few papers address the chemical modifications to the seed coat after plasma treatment. Here, a summary of the methods used to analyze plasma-treated seeds is presented, such as SEM, contact angle goniometry, energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The results obtained on Arabidopsis thaliana Col-0 seeds and the limitations of these techniques are discussed. An experiment was designed in order to compare the relative advantages and limitations of these surface analysis techniques by investigating the separate effects of plasma, heat, and ozone on A. thaliana seeds.

scholarly journals UV Photo-Oxidation of Polybenzimidazole (PBI)

Technologies ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 52
Author(s):  
Devon Shedden ◽  
Kristen M. Atkinson ◽  
Ibrahim Cisse ◽  
Shin Lutondo ◽  
Tyshawn Roundtree ◽  
...  
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Treatment Time ◽  
Aerospace Industry ◽  
Water Contact ◽  
X Ray ◽  
Force Microscopy ◽  
Photo Oxidation ◽  
Redox Flow Batteries ◽  
Atomic Force

Since polybenzimidazole (PBI) is often used in the aerospace industry, high-temperature fuel cells, and in redox flow batteries, this research investigated the surface modification of PBI film with 253.7 and 184.9 nm UV photo-oxidation. As observed by X-ray photoelectron spectroscopy (XPS), the oxygen concentration on the surface increased up to a saturation level of 20.2 ± 0.7 at %. With increasing treatment time, there were significant decreases in the concentrations of C-C sp2 and C=N groups and increases in the concentrations of C=O, O-C=O, O-(C=O)-O, C-N, and N-C=O containing moieties due to 253.7 nm photo-oxidation of the aromatic groups of PBI and reaction with ozone produced by 184. 9 nm photo-dissociation of oxygen. Because no significant changes in surface topography were detected by Atomic Force Microscopy (AFM) and SEM measurements, the observed decrease in the water contact angle down to ca. 44°, i.e., increase in hydrophilic, was due to the chemical changes on the surface.

Investigation of the Effect of Uv-Assisted Oxidation and Nitridation of Hafnium Metal Films

2003 ◽  
Vol 780 ◽  
Author(s):  
C. Essary ◽  
V. Craciun ◽  
J. M. Howard ◽  
R. K. Singh
Keyword(s):  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Grazing Angle ◽  
X Ray Diffraction ◽  
Metal Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Silicon Interface

AbstractHf metal thin films were deposited on Si substrates using a pulsed laser deposition technique in vacuum and in ammonia ambients. The films were then oxidized at 400 °C in 300 Torr of O2. Half the samples were oxidized in the presence of ultraviolet (UV) radiation from a Hg lamp array. X-ray photoelectron spectroscopy, atomic force microscopy, and grazing angle X-ray diffraction were used to compare the crystallinity, roughness, and composition of the films. It has been found that UV radiation causes roughening of the films and also promotes crystallization at lower temperatures.Furthermore, increased silicon oxidation at the interface was noted with the UVirradiated samples and was shown to be in the form of a mixed layer using angle-resolved X-ray photoelectron spectroscopy. Incorporation of nitrogen into the film reduces the oxidation of the silicon interface.

scholarly journals Change in Interface Characteristics of ITO Modified with n-decyltrimethoxysilane

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 645
Author(s):  
Myung-Gyun Baek ◽  
Johng-Eon Shin ◽  
Dong-Hyun Hwang ◽  
Sung-Hoon Kim ◽  
Hong-Gyu Park ◽  
...  
Keyword(s):  
Contact Angle ◽  
Work Function ◽  
Indium Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Deposition Time ◽  
Interfacial Properties ◽  
Average Roughness ◽  
Light Emitting ◽  
Force Microscopy ◽  
Angle Measurements

Herein, we examined changes in the interfacial properties of organic light-emitting diodes when n-decyltrimethoxysilane (CH3SAM) was deposited on the surface of an indium tin oxide (ITO) electrode for various deposition times. It was revealed that the interfacial properties varied with deposition time. As the latter increased, so did the measured value of the contact angle, and ITO substrate exhibited a lower wettability. The contact angle measurements for bare ITO at 1, 10, 30, and 90 min were 57.41°, 63.43°, 73.76°, 81.47°, respectively, and the highest value obtained was 93.34°. In addition, the average roughness and work function of the ITO were measured using atomic force microscopy and X-ray photoelectron spectroscopy. As the deposition time of CH3SAM on the ITO substrates increased, it was evident that the former was well aligned with the latter, improving surface modification. The work function of CH3SAM, modified on the ITO substrates, improved by approximately 0.11 eV from 5.05–5.16 eV. The introduction of CH3SAM to the ITO revealed the ease of adjustment of the characteristics of ITO substrates.

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