Comparison with Amino Group and Hydrophilic Group for Protein Afftnity by Excimer Laser Induced Functional Groups Substitution Onto Pet Film

2002 ◽  
Vol 735 ◽  
Author(s):  
Hitoshi Omuro ◽  
Masato Nakagawa ◽  
Hiroaki Fukuda ◽  
Masataka Murahara
Keyword(s):  
Contact Angle ◽  
Functional Groups ◽  
Excimer Laser ◽  
Bonding Strength ◽  
Functional Group ◽  
Laser Light ◽  
Artificial Ligament ◽  
Untreated Sample ◽  
Ammonia Gas ◽  
Arf Excimer Laser

ABSTRACTPET has been widely used for medical materials such as an artificial ligament. However, the affinity of tissues is no good. To compensate this, the mesh formed PET has clinically been used for artificial ligament intruding tissue into mesh. However, this method has not shown sufficient affinity with the tissue; that is, the initial adapting strength of the material and tissue is weak. · The artificial ligament must be biocompatible to contact blood and tissue. The foregoing artificial ligament, however, doesn't satisfy the biocompatibility. ·Thus, we have modified the PET surface into hydrophilic by substituting NH2 or OH functional groups. Firstly, an ArF excimer laser light was irradiated the PET with water on top. The OH functional group was substituted on the PET surface by this photochemical reaction. Secondly, the ArF excimer laser light was irradiated the PET in ammonia gas ambient. In this photochemical reaction, the NH2 functional group was substituted on the PET surface.· In this study, the untreated sample had the contact angle with water of 80 degrees and the bonding strength with protein of only 1.0kg/cm2. The contact angle of the modified sample improved to 40 degrees and the bonding strength, to 23kg/cm2. When treated in ammonia gas, the contact angle also improved to 40 degrees; however, the bonding strength was almost the same as that of the untreated sample.It was confirmed that the affinity of the PET for water and protein could be controlled by increasing or decreasing the substitution concentration of OH and NH2 functional groups on the surface.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

ArF Laser Induced Photochemical Substitution of OH Radicals into Teflon Surface Using Al(OH)3 Solution

1992 ◽  
Vol 279 ◽  
Author(s):  
M. Okoshi ◽  
H. Kashiura ◽  
T. Miyokawa ◽  
K. Toyoda ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
Excimer Laser ◽  
Laser Light ◽  
Water Solution ◽  
Sample Surface ◽  
Oh Radicals ◽  
Xps Analysis ◽  
Air Atmosphere ◽  
Arf Excimer Laser ◽  
Teflon Film

ABSTRACTOH radicals were photochemically substituted for fluorine atoms in the teflon surface by using an ArF excimer laser light and an Al(OH)3 solution. This method is simple and can be performed in air atmosphere. In the process, the teflon film was placed on the Al(OH)3 which were dissolved in NaOH water solution; the ArF excimer laser light was irradiated the sample surface and the solution. By irradiating the laser, the surface was defluorinated by the aluminium atoms photodissociated from the Al(OH)3 solution, and the dangling bonds which were formed in the defluorinated surface combined with the OH radicals also photodissociated. The hydrophilic property of the photomodified surface was evaluated by the measurement of the contact angle with water. The defluorination and the OH radicals substitution were inspected by the XPS analysis and the ATR-FTIR measurement.

1701 Birefringence Analysis for Calcium Fluoride Single Crystal Used as Chamber Window of ArF Excimer Laser Light Source

2010 ◽  
Vol 2010.23 (0) ◽  
pp. 437-438
Author(s):  
Yuta KITAMURA ◽  
Noriyuki MIYAZAKI ◽  
Takahito KUMAZAKI ◽  
Naoto NAGAKURA ◽  
Yasuhiro HASHIMOTO ◽  
...  
Keyword(s):  
Single Crystal ◽  
Light Source ◽  
Excimer Laser ◽  
Calcium Fluoride ◽  
Laser Light ◽  
Arf Excimer Laser ◽  
Laser Light Source

Dynamic change of transmission of CaF 2 single crystals by irradiating with ArF excimer laser light

2000 ◽  
Author(s):  
Jochen Alkemper ◽  
Joerg Kandler ◽  
Lorenz Strenge ◽  
Ewald Moersen ◽  
Christian Muehlig ◽  
...  
Keyword(s):  
Single Crystals ◽  
Excimer Laser ◽  
Laser Light ◽  
Dynamic Change ◽  
Arf Excimer Laser

Inner Pore of Porous Fluoropolymer to Hydrophilic by using UV Light and H20 Vapor

1998 ◽  
Vol 544 ◽  
Author(s):  
Shinsuke Ito ◽  
Masataka Murahara
Keyword(s):  
Contact Angle ◽  
Excimer Laser ◽  
Water Permeability ◽  
Uv Light ◽  
Ethanol Solution ◽  
Oh Radicals ◽  
Arf Excimer Laser ◽  
Inner Pore

AbstractInner pores of porous PTFE was modified photochemically by using ArF excimer laser for improvement of water permeability. In this study, two modification methods are described. One is using ethanol solution, and another is H20 vapor as a reaction gas. These reaction sources were employed for modification of inner pores. In the case of using ethanol solution, the modified sample indicates both hydrophilication and oleophilication. On the contrary, the hydrophilic groups are substituted into the inner pore with H20 vapor. The hydrophilication of modified samples were evaluated by the measurement of contact angle with water and water permeability. The substituted OH radicals were inspected by ATR-FTIR measurement.

Real Time Measurement of Functional Groups Substitution on Fluorocarbon Surface by ATR FT-IR

2004 ◽  
Vol 843 ◽  
Author(s):  
Yuki Sato ◽  
Masataka Murahara
Keyword(s):  
Contact Angle ◽  
Formic Acid ◽  
Real Time ◽  
Functional Groups ◽  
Attenuated Total Reflectance ◽  
Untreated Sample ◽  
Total Reflectance ◽  
Real Time Measurement ◽  
Hydrophilic Group ◽  
Ft Ir

ABSTRACTThe photochemical reaction process steps in substituting the functional groups on the surface of fluorocarbon [FEP] by irradiating an Xe2 excimer lamp on water or formic acid and FEP placed on the attenuated total reflectance [ATR] prism, has been measured in real time. These steps include, water photo-dissociation, the defluorination of the FEP and the hydrophilic group substitution.In case of formic acid, the absorption peaks of the -CHO in the region of 2940 cm−1 and the -COOH in the region of 1710 cm−1 decreased respectively by photo dissociation, but that of the -OH in the region of 3300cm−1 increased. The results indicated that the -CHO and -COOH have turned to -OH.Furthermore, the contact angle with water was measured. When compared to the untreated sample, whose contact angle was 110 degrees, the contact angle of the sample treated with water and the Xe2 lamp irradiation for 25 minutes became 31 degrees, and that of the sample modified with formic acid and the lamp irradiated for 25 minutes further improved to 17 degrees. This implies that the hydrophilic groups were produced more in formic acid than in water.

scholarly journals Enhanced photosensitivity in lightly doped standard telecommunication fibre exposed to high fluence ArF excimer laser light

1995 ◽  
Vol 31 (11) ◽  
pp. 879-880 ◽  
Author(s):  
B. Malo ◽  
K.O. Hill ◽  
D.C. Johnson ◽  
F. Bilodeau ◽  
J. Albert ◽  
...  
Keyword(s):  
Excimer Laser ◽  
Laser Light ◽  
High Fluence ◽  
Arf Excimer Laser
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