scholarly journals The Reversible Giant Change in the Contact Angle on the Polysulfone and Polyethersulfone Films Exposed to UV Irradiation.

Langmuir ◽  
2009 ◽  
Vol 25 (8) ◽  
pp. 4828-4828
Author(s):  
Edward Bormashenko ◽  
Roman Pogreb ◽  
Gene Whyman ◽  
Yelena Bormashenko ◽  
Rachel Jager ◽  
...  
Keyword(s):  
Contact Angle ◽  
Uv Irradiation

Surface Modification of Asymmetric Polysulfone Membrane by UV Irradiation

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
Sutthisa Konruang ◽  
Thawat Chittrakarn ◽  
Suksawat Sirijarukul
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Functional Groups ◽  
Uv Irradiation ◽  
Water Flux ◽  
Inversion Method ◽  
Asymmetric Structure ◽  
Polysulfone Membrane ◽  
Polar Functional Groups ◽  
Polysulfone Membranes

The effects of ultraviolet (UV) irradiation for surface modification of hydrophobic asymmetric polysulfone membranes have been investigated. The asymmetric polysulfone (PSF) membranes were prepared by phase inversion method using 19%-25% of PSF in two solvents, viz. dimethylacetamide (DMF) and Acetone (Ac) collectively. The surface of asymmetric polysulfone membranes were modified by UV ray with 254 and 312 nm wavelength. Chemical and physical properties of the untreated and the treated membranes were characterized. Scanning electron microscope (SEM) was used to determine asymmetric structure of polysulfone membranes. Contact angle device was used to analyzed the effected of UV ray treatment on hydrophilicity of membranes surface. Polar functional groups introduced by UV irradiation were examined using FTIR. The water flux was measured under a pressure of 500 kPa to 2,500 kPa with a feed temperature of 25°C. It was shown that asymmetric polysulfone membranes were produced and the UV ray treatment significantly alters the hydrophilicity of membranes surface indicated by the reduction of water contact angle with increasing treatment time. The FTIR analysis showed the formations of polar functional groups such as hydroxyl and carbonyl groups. Consequently, the surface of asymmetric polysulfone membranes was changed from hydrophobic to hydrophilic by UV irradiation leading to the enhancement of the water flux.

scholarly journals Influence of Annealing and UV Irradiation on Hydrophilicity of Ag- Nanostructured Thin Films

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Fanming Meng ◽  
Zhaoqi Sun ◽  
Xueping Song
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Contact Angle ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Annealing Time ◽  
Irradiation Time ◽  
Ambient Air ◽  
Water Contact ◽  
Nanostructured Thin Films

Ag-TiO2nanostructured thin films with silver content of 5 vol% have been deposited on silicon, glass, and quartz substrates by RF magnetron sputtering and annealed in ambient air at 900°C for 15, 30, 60, 90, and 120 min. Their crystal structure, surface morphology, and hydrophilicity have been characterized by X-ray diffractometer, atomic force microscope, and water contact angle apparatus, respectively. The influence of annealing time and UV irradiation time on hydrophilic property of Ag-TiO2thin films have been studied in detail. It is shown that annealing time influences crystal structure of Ag-TiO2thin films. The unannealed film is amorphous and shows poor hydrophilicity. With the increase of annealing time from 15 to 120 min, the grain-size slowly increases and tends to uniformity. A suitable annealing time can significantly enhance the hydrophilic behavior of Ag-TiO2films. Water contact angle decreases with the increase of irradiation time. The mechanism of hydrophilicity has been proposed and can be attributed to the increase of oxygen anion radicals and reactive center of surface .

scholarly journals Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite

2020 ◽  
Author(s):  
Sho Kaneko ◽  
Yuji Yamamoto ◽  
Kaniichro Wada ◽  
Gentaro Kumagai ◽  
Yoshifumi Harada ◽  
...  
Keyword(s):  
Contact Angle ◽  
Uv Irradiation ◽  
Uv Light ◽  
Water Drop ◽  
Area Ratio ◽  
Bone Volume ◽  
High Porosity ◽  
Bone Area ◽  
Dental Surgery ◽  
Significant Difference

Abstract Background Treating a titanium or titanium alloy implant with ultraviolet (UV) light is known to improve its associated cell growth and osseointegration. However, little is known about the effect of UV irradiation on hydroxyapatite (HA), which is also used frequently in orthopaedic and dental surgery. Here we examined the effect of UV irradiation on the hydrophilicity of HA, and on its osteoconduction ability in rats. Methods HA implants of low and high porosity were treated with UV light, and photofunctionalisation was assessed by the contact angle of a water drop on the surface. HA implants were also inserted into rat femurs, and the rats were killed two or four weeks later. The bone volume and bone area ratio were calculated from microcomputed tomography and histological data. Results The contact angle of a water drop on HA implants of both porosities was significantly reduced after UV irradiation. In the rat femurs, there was no significant difference in the bone volume between the UV light-treated and control implants at two or four weeks. The bone area ratio for the UV light-treated versus control implants was significantly increased at two weeks, but there was no significant difference at four weeks. Conclusions The surface of UV-irradiated HA disks was hydrophilic, in contrast to that of non-irradiated HA disks. Photofunctionalisation accelerated the increase in the bone area ratio in the early healing stage. This technology can be applied to surgical cases requiring the early fusion of bone and HA.

scholarly journals Ultraviolet irradiation improves the hydrophilicity and osteo-conduction of hydroxyapatite

2020 ◽  
Author(s):  
Sho Kaneko ◽  
Yuji Yamamoto ◽  
Kaniichro Wada ◽  
Gentaro Kumagai ◽  
Yoshifumi Harada ◽  
...  
Keyword(s):  
Contact Angle ◽  
Uv Irradiation ◽  
Uv Light ◽  
Water Drop ◽  
Area Ratio ◽  
Bone Volume ◽  
High Porosity ◽  
Bone Area ◽  
Dental Surgery ◽  
Significant Difference

Abstract Background: Treating a titanium or titanium alloy implant with ultraviolet (UV) light is known to improve its associated cell growth and osseointegration. However, little is known about the effect of UV irradiation on hydroxyapatite (HA), which is also used frequently in orthopaedic and dental surgery. Here we examined the effect of UV irradiation on the hydrophilicity of HA, and on its osteoconduction ability in rats. Methods: HA implants of low and high porosity were treated with UV light, and photofunctionalisation was assessed by the contact angle of a water drop on the surface. HA implants were also inserted into rat femurs, and the rats were killed two or four weeks later. The bone volume and bone area ratio were calculated from microcomputed tomography and histological data. Results: The contact angle of a water drop on HA implants of both porosities was significantly reduced after UV irradiation. In the rat femurs, there was no significant difference in the bone volume between the UV light-treated and control implants at two or four weeks. The bone area ratio for the UV light-treated versus control implants was significantly increased at two weeks, but there was no significant difference at four weeks. Conclusions: The surface of UV-irradiated HA disks was hydrophilic, in contrast to that of non-irradiated HA disks. Photofunctionalisation accelerated the increase in the bone area ratio in the early healing stage. This technology can be applied to surgical cases requiring the early fusion of bone and HA.

Photocatalytic and Self-Cleaning Properties of TiO2-Cu Thin Films on Glass Substrate

2012 ◽  
Vol 152-154 ◽  
pp. 409-413 ◽  
Author(s):  
Weerachai Sangchay ◽  
Lek Sikong ◽  
Kalayanee Kooptarnond
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Uv Irradiation ◽  
Sol Gel ◽  
Dip Coating ◽  
Glass Slides ◽  
Coating Method ◽  
Small Contact Angle ◽  
Self Cleaning ◽  
Dip Coating Method

TiO2-Cu thin films containing 0 to 1%Cu coated on glass slides were prepared by sol gel-dip coating method. The prepared thin films were synthesized at the temperature of 400 ◦C for 2 h with a heating rate of 10◦C/min. The microstructures of synthesized TiO2-Cu thin films were characterized by XRD, FT-IR and SEM. The photocatalytic activities of TiO-2Cu thin films were tested using methylene blue (MB) solution under UV irradiation. Finally, the self-cleaning property was evaluated by means of contact angle of water droplet on the films. The results show all samples have the thickness in range of 1 um and surfaces are dense with a large surface area. It can be noted that TiO2-1.0Cu thin films were found to give the highest photocatalytic efficiency and exhibited self-cleaning effect (small contact angle, 17°) under UV irradiation.

scholarly journals Experiment Research on Bonding Effect of Poly(lactic-co-glycolic acid) Device by Surface Treatment Method

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaopeng Wang ◽  
Kun Lian ◽  
Tianning Chen
Keyword(s):  
Contact Angle ◽  
Surface Treatment ◽  
Uv Irradiation ◽  
Bonding Temperature ◽  
Treatment Method ◽  
Degradable Polymer ◽  
Bonding Effect ◽  
Experimental Surface ◽  
Surface Contact Angle ◽  
Plga Film

According to the low temperature and high effective bonding problem of microdevices made of degradable polymer PLGA, chemical, plasma, and UV irradiation method are used to study the experimental surface treatment of PLGA films and microdevices bonding process. The results show that all three methods can reduce the surface contact angle of PLGA films, the contact angle increases with time at room temperature, and the PLGA films contact angle is almost unchanged under refrigeration. The PLGA film bonding temperature is significantly reduced after UV irradiation, and the bonding interfaces also generate diffusion cross linking layer are dense and uniform.

Modification of cellulose by UV-grafting of an organopolysilazane oligomer

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
P.M. Serafini ◽  
R. Bongiovanni ◽  
E. Zeno
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Thermal Resistance ◽  
Uv Irradiation ◽  
New Products ◽  
Cellulose Fiber ◽  
Water Repellency ◽  
Cellulose Fibers ◽  
Fiber Network

AbstractThe modification of cellulose fibers by grafting specific functions could improve their quality and allow their use for the development of new products. In this work we report about the functionalization of a cellulose fiber network (filters) with organo-polysilazane oligomers by UV-irradiation. Photo-induced grafting, as assessed by contact angle and TGA measurements, was successful: an interesting enhancement of thermal resistance and mechanical properties was obtained. Water repellency was also achieved.

Effects of Ultraviolet (UV) Treatment on the Properties of Black Tilapia Fish Skins Gelatin

2020 ◽  
Vol 1010 ◽  
pp. 465-470
Author(s):  
Norhasikin Ismail ◽  
Maizlinda Izwana Idris ◽  
Hasan Zuhudi Abdullah
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Water Contact Angle ◽  
Uv Irradiation ◽  
Functional Group ◽  
Gel Strength ◽  
Fish Gelatin ◽  
Uv Treatment ◽  
Water Contact

The aim of the study is to investigate the effects of ultraviolet (UV) treatment on the properties of black tilapia fish skins gelatin. The fish gelatin were investigated in terms of gel strength, functional group and the water contact angle of the gelatin. The UV treatment were irradiated with UVA and UVC at different time (0.5, 1.0, 1.5 and 2.0 h). The gel strength of gelatin gel significantly increases after UV irradiation for both UVA and UVC sample. The water contact angle of the gelatin was categorized as hydrophobic for both gelatin that treated with UVA and UVC which the angle >65°. The interactions and characteristic of functional groups for gelatin that treated with UV were analyzed via Fourier Transform Infrared Spectroscopy (FTIR). Results indicated that employing UV irradiation as an alternative method to enhance some of the quality attributes of fish gelatin.

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