Photochemical modification of polytetrafluoroethylene into oleophilic property using an ArF excimer laser

1992 ◽  
Vol 7 (7) ◽  
pp. 1912-1916 ◽  
Author(s):  
M. Okoshi ◽  
M. Murahara ◽  
K. Toyoda
Keyword(s):  
Excimer Laser ◽  
Polymer Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Photochemical Reactions ◽  
Xps Analysis ◽  
Spectrum Measurement ◽  
Arf Excimer Laser ◽  
The Stability ◽  
Photochemical Modification

Photochemical modification of the polytetrafluoroethylene (PTFE) with incorporation of the CH3 radical released from the B(CH3)3 molecule excited by an ArF excimer laser has been demonstrated. The incorporation of CH3 radicals and the depletion of fluorine atoms of the polymer surface were studied by XPS analysis and infrared ATR spectrum measurement. In these photochemical reactions, the photoirradiated surface changed into oleophilic. The properties were studied by contact angle measurement. The stability of the oleophilic surface was examined at the elevated temperature of 200 °C for 6 h in O2 or N2 ambient and also by immersing in alkaline or acid water solutions.

Growth of Silicon Films Onto Fluororesin Surface by ArF Excimer Laser

1993 ◽  
Vol 334 ◽  
Author(s):  
T. Miyokawa ◽  
M. Okoshi ◽  
K. Toyoda ◽  
M. Murahara
Keyword(s):  
Surface Roughness ◽  
Surface Modification ◽  
Excimer Laser ◽  
High Density ◽  
Silicon Films ◽  
Chemical Compositions ◽  
Xps Analysis ◽  
Modification Process ◽  
Arf Excimer Laser ◽  
Mixed Gases

AbstractSilicon films were deposited on a fluororesin surface. The process was divided into two steps: surface modification process and silicon CVD onto the modified parts. In the modification process, SiH4 and B(CH3)3 mixed gases were used with ArF excimer laser. Fluorine atoms of the surface were pulled out by boron atoms which were photo—dissociated from B(CH3)3 and were replaced with silicon atoms released from SiH4. In the CVD process, SiH4 gas was used with high—density excited ArF excimer laser. Silicon films were deposited onto the nuclei by photodecomposition of SiH4.Chemical compositions of the modified layers and the deposited parts were inspected by XPS analysis. 1000 Å thickness of the deposited silicon films was confirmed by the surface roughness interference–meter.

Preparation and Characterization of Fluoroalkyl Methacrylate Copolymer Emulsion Using in Glass Fiber

2012 ◽  
Vol 580 ◽  
pp. 548-551
Author(s):  
Yi Ming Sun ◽  
Xia Xie ◽  
Xu Huang Chen ◽  
Yan Lin Chen
Keyword(s):  
Glass Fiber ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Copolymer Film ◽  
Latex Film ◽  
Hydrophobic Property ◽  
Particle Size Analyzer ◽  
The Stability ◽  
Methacrylate Copolymer

Copolymer emulsions containing fluorine were prepared by emulsion polymerization with MMA, BA and G06B using SDBS as emulsifier. The copolymer was characterized by FTIR and DSC. The size and distribution of the latex particle in emulsion were obtained by particle size analyzer. The stability of emulsion was observed and the solvent resistance of latex films was investigated. Surface properties of the copolymer film were investigated by contact angle measurement. The results showed that adding fluorine group to copolymer could increase hydrophobic property of the latex film and decrease the surface free energy of copolymer film. Glass fiber will have excellent properties when combining with the copolymer emulsion.

Dimethylsulphoxide induction of the murine macrophage-like line P388D1: change of phagocytic ability and cell surface properties

1983 ◽  
Vol 64 (1) ◽  
pp. 281-293
Author(s):  
C. Capo ◽  
Z. Mishal ◽  
V. Balloy ◽  
A.M. Benoliel ◽  
P. Bongrand
Keyword(s):  
Surface Charge ◽  
Surface Properties ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Membrane Dynamics ◽  
Murine Macrophage ◽  
Before And After ◽  
Dmso Treatment ◽  
The Stability

The murine macrophage-like cell line P388D1 ingests immunoglobulin-coated sheep red cells (IgG-SRC) poorly, but after 3 days incubation in the presence of 1.5% dimethyl sulphoxide (DMSO), it becomes highly phagocytic. We used this model to correlate triggering of phagocytosis with some surface properties of P388D1 cells, possibly involved in recognition or engulfment of particles. The accessibility of Fc receptors on the cell membranes did not seem to be affected by DMSO treatment since the binding of IgG-SRC to cells was the same before and after treatment with DMSO. A technique allowing quantitative determination of the stability of cell-particle binding showed that binding strength was not the only essential factor in triggering ingestion. Hydrophobicity and surface charge were postulated to play a role in phagocytic recognition. No change in hydrophobicity, as assayed by contact-angle measurement, and in net surface charge evaluated by cell electrophoresis, was observed for normal and DMSO-treated P388D1 cells. On the other hand, the fluorescence polarization of a membrane lipophilic probe (1,6-diphenyl-1,3,5-hexatriene) was significantly (P less than 0.01) decreased when P388D1 cells were treated with DMSO. Since the effect of DMSO on P388D1 function was delayed, our results were consistent with the view that enhancement of phagocytosis might be a consequence of some modification of membrane dynamics, due to changes in lipid composition.

scholarly journals Polylactic acid surface activation by atmospheric pressure dielectric barrier discharge plasma

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Beáta Hergelová ◽  
Anna Zahoranová ◽  
Dušan Kováčik ◽  
Monika Stupavská ◽  
Mirko Černák
Keyword(s):  
Polylactic Acid ◽  
Barrier Discharge ◽  
Treatment Time ◽  
Polymer Surface ◽  
Nonthermal Plasma ◽  
Ambient Air ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Surface Barrier ◽  
Barrier Discharge Plasma

AbstractPolylactic acid (PLA) is suitable for applications in packaging and biomedicine due to its biodegradability. To improve PLA surface adhesion a plasma-chemical treatment using nonthermal plasma generated in ambient air via diffuse coplanar surface barrier discharge (DCSBD) was used. The optimal treatment time and power were investigated. Interaction between active plasma species and the polymer surface, and the resulting surface changes were studied by contact angle measurement, surface energy determination, FTIR, and XPS. The most hydrophilic surface was obtained after only 3–4 s treatment. Treatment up to 10 s did not damage the polymer but longer treatments (30 and 60 s) caused partial degradation. The plasma broke C-C/C-H bonds and formed more C-O, O-C=O and C-O-C bonds. During storage surface oxygen decreased and a negligible amount of nitrogen was adsorbed. The oxygen-containing functional groups probably sank into the PLA volume after treatment.

Electroless Copper Deposition on PET Sheets

2013 ◽  
Vol 802 ◽  
pp. 262-266 ◽  
Author(s):  
Katesara Phasuksom ◽  
Walaiporn Prissanaroon-Ouajai ◽  
Narelle Brack ◽  
Paul Pigram
Keyword(s):  
Electroless Deposition ◽  
Chemical Change ◽  
Contact Angle Measurement ◽  
Copper Surface ◽  
Angle Measurement ◽  
Copper Deposition ◽  
Xps Analysis ◽  
Contact Printing ◽  
Flexible Sensors ◽  
Printing Technique

This paper describes metallization of PET surface by Sn-free electroless deposition (ELD) of thin copper layer. Prior to introduction to ELD process, the PET surface was plasma-pretreated in argon atmosphere. ELD is a multi-step process involving silanization with TMS, activation with PdCl2 and copper deposition. Contact angle measurement and XPS analysis were carried out at each stage in order to confirm the chemical change of the PET surface after modification. XPS analysis revealed that the copper surface consisted mainly of Cu2O, combined with Cu0, making Cu-coated PET sheet suitable for the use as substrate for electropolymerization of pyrrole. This study offers an alternative to preparing flexible sensors. This process could be further applied to micro-contact printing technique to fabricate flexible patterned electrodes.

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.

Novel Process for Ceramic Epitaxy Using Laser Mbe

1990 ◽  
Vol 201 ◽  
Author(s):  
Mamoru Yoshimoto ◽  
Hirotoshi Nagata ◽  
Tadashi Tsukahara ◽  
Satoshi Gonda ◽  
Hideomi Koinuma
Keyword(s):  
Thin Films ◽  
Excimer Laser ◽  
Xps Analysis ◽  
Heteroepitaxial Growth ◽  
Ceramic Thin Films ◽  
Depth Analysis ◽  
Band Profile ◽  
Arf Excimer Laser ◽  
Laser Mbe

AbstractAn ArF excimer laser MBE system specially designed for the deposition of ceramic thin films was used to construct atomi-cally defined epitaxial SrCuO2−x films. According to XPS analysis, Cu valence was evaluated to be 2+ in the film as-grown in the presence of 10−7 Torr NO2, but it was less than 2+ in the film prepared in the presence of 10−7Torr 02. In situ XPS depth analysis of as-grown SrCuO2−x film on SrTiO3 substrate revealed the band profile at the interface of the film and substarte. Ceramic superlattices composed of metallic SrCuO2−x (3∼8nm thick) and insulative SrTiO3 (8nm thick) were prepared by sequential heteroepitaxial growth.

scholarly journals An Investigation of the Effect of Electrode Geometry and Frequency of Power Supply in the Homogeneity of Dielectric Barrier Discharge in Air

1970 ◽  
Vol 6 (1) ◽  
pp. 96-101 ◽  
Author(s):  
RB Tyata' ◽  
DP Subedi
Keyword(s):  
Contact Angle ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Polymer Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Electrode Geometry ◽  
Dielectric Barrier ◽  
Digital Oscilloscope ◽  
Measurement Surface

An experimental investigation of dielectric barrier discharge (DBD) produced in air isreported in the present paper. The discharge was produced by applying 0?20 kV AC source atfrequency 10?30 kHz. The main objective of the study was to investigate the dependence ofthe discharge homogeneity on the frequency of applied source and the geometry of theelectrodes. For this propose, three different types of electrodes were used. The discharge wassystematically investigated on an extended range of electrical parameters using highfrequency digital oscilloscope. Non-thermal nature of the discharge was tested by thetreatment of hydrophobic polymer surface by measuring the change in contact angle withwater drops.Key words: DBD; electrode geometry; contact angle measurement; surface treatmentDOI: 10.3126/kuset.v6i1.3316 Kathmandu University Journal of Science, Engineering and Technology Vol.6(1) 2010, pp96-101

Selective Surface Modification of a Fluorocarbon Resin Into Hydrophilic Material Using an Excimer Laser

1990 ◽  
Vol 201 ◽  
Author(s):  
M. Okoshi ◽  
M. Murahara ◽  
K. Toyoda
Keyword(s):  
Surface Modification ◽  
Laser Beam ◽  
Excimer Laser ◽  
Contact Angles ◽  
Xps Analysis ◽  
Sem Image ◽  
Ammonia Complex ◽  
Hydrophilic Material ◽  
Arf Excimer Laser ◽  
Selective Surface Modification

AbstractSelective surface modification of fluorocarbon resin has been demonstrated by using an ArF excimer laser beam and an ammonia complex which was made from NH3 and B2H6 gases. The fluorocarbon resin was set in the atmosphere of NH3 gas. NH3 molecules which were adsorbed on the surface reacted quickly with the B2H6 molecules, and an ammonia complex was produced. As a result, the complex was adsorbed on the surface. The resin surface was selectively irradiated by ArF laser beam. The complex and C-F bonds of this resin were excited by the laser beam, and the surface was selectively modified to be hydrophilic property. The modified samples were evaluated by XPS analysis, measuring the contact angles of the water and the SEM image on the surface.

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