Hydrophilicity and morphological investigation of polycarbonate irradiated by ArF excimer laser

Jaleh, Babak; Parvin, Parviz; Sheikh, N.; Zamanipour, Zahra; Sajad, Batool

doi:10.1016/j.nimb.2007.08.067

Cited by 29 publications

(11 citation statements)

References 4 publications

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“…CO 2 lasers are commonly used for processing different materials, e.g., cutting, welding, and engraving, and in laser surgery. It has been assumed that treatment with laser radiation makes the surface more hydrophilic, creating regions facilitating the attachment of cultivated cells [ 63 ].…”

Section: Introductionmentioning

confidence: 99%

Laser Processing of Polymer Films Fabricated from PHAs Differing in Their Monomer Composition

et al. 2021

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The study reports results of using a CO2-laser in continuous wave (3 W; 2 m/s) and quasi-pulsed (13.5 W; 1 m/s) modes to treat films prepared by solvent casting technique from four types of polyhydroxyalkanoates (PHAs), namely poly-3-hydroxybutyrate and three copolymers of 3-hydroxybutyrate: with 4-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyhexanoate (each second monomer constituting about 30 mol.%). The PHAs differed in their thermal and molecular weight properties and degree of crystallinity. Pristine films differed in porosity, hydrophilicity, and roughness parameters. The two modes of laser treatment altered these parameters and biocompatibility in diverse ways. Films of P(3HB) had water contact angle and surface energy of 92° and 30.8 mN/m, respectively, and average roughness of 144 nm. The water contact angle of copolymer films decreased to 80–56° and surface energy and roughness increased to 41–57 mN/m and 172–290 nm, respectively. Treatment in either mode resulted in different modifications of the films, depending on their composition and irradiation mode. Laser-treated P(3HB) films exhibited a decrease in water contact angle, which was more considerable after the treatment in the quasi-pulsed mode. Roughness parameters were changed by the treatment in both modes. Continuous wave line-by-line irradiation caused formation of sintered grooves on the film surface, which exhibited some change in water contact angle (76–80°) and reduced roughness parameters (to 40–45 mN/m) for most films. Treatment in the quasi-pulsed raster mode resulted in the formation of pits with no pronounced sintered regions on the film surface, a more considerably decreased water contact angle (to 67–76°), and increased roughness of most specimens. Colorimetric assay for assessing cell metabolic activity (MTT) in NIH 3T3 mouse fibroblast culture showed that the number of fibroblasts on the films treated in the continuous wave mode was somewhat lower; treatment in quasi-pulsed radiation mode caused an increase in the number of viable cells by a factor of 1.26 to 1.76, depending on PHA composition. This is an important result, offering an opportunity of targeted surface modification of PHA products aimed at preventing or facilitating cell attachment.

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Section: Introductionmentioning

confidence: 99%

Laser Processing of Polymer Films Fabricated from PHAs Differing in Their Monomer Composition

et al. 2021

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“…Polymer surfaces can be modified, e.g. by deep UV-irradiation of an excimer lamp [1,2], light emitted by an atmospheric pressure plasma source [3,4] or by excimer laser beams [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Gold nano-wires and nano-layers at laser-induced nano-ripples on PET

Siegel

Slepička

Heitz

et al. 2010

Applied Surface Science

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“…A hydrophobic or superhydrophobic silicone is useful for industrial and biomedical applications [23,24]. As useful references, the fabrications of regular patterns on polycarbonate by ArF excimer laser are also available [25,26]. In the series of our work, very recently, a frusto-conical shape of the obtained microswelling structure could be changed to cylindrical by just depositing an Al thin film between microspheres and silicone rubber during laser irradiation, for the use as a micro/nanosuction cup [27,28].…”

Section: Introductionmentioning

confidence: 99%

Micro/nano-suction cup structure of silicone rubber fabricated by ArF excimer laser

Okoshi

2019

SN Appl. Sci.

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Micro/nano-suction cups of silicone rubber, cylindrical swelling structures in micron size with a hole of hundreds nanometer diameter each, were fabricated by 193-nm ArF excimer laser-induced photodissociation of silicone rubber. To be periodically, silica glass microspheres of 2.5 μm diameter were aligned on silicone rubber via Al thin film during laser irradiation. The Al thin film underneath each microsphere was locally laser-ablated to enable a circular irradiation of subsequent laser pulses, then the exposed silicone rubber was photochemically swelled by the photodissociation of Si-O bonds of silicone rubber. Also, debris of aluminum surrounding the laser-ablated areas resulted in pushing microsphere up to adjust a focal point to the surface of silicone rubber to form a hole centered at each the swelled silicone. The fabricated structure showed clear superhydrophobic properties. Dependence of single pulse fluence of ArF excimer laser on the fabrication of micro/nano-suction cup structure was discussed, together with the variation of thickness of Al thin film from 10 to 100 nm. The use of the superhydrophobic silicone rubber we fabricated is expected as a kind of delivery system, toward holding a small object even in water by each micro/nano-suction cup structure.

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Hydrophilicity and morphological investigation of polycarbonate irradiated by ArF excimer laser

Cited by 29 publications

References 4 publications

Laser Processing of Polymer Films Fabricated from PHAs Differing in Their Monomer Composition

Laser Processing of Polymer Films Fabricated from PHAs Differing in Their Monomer Composition

Gold nano-wires and nano-layers at laser-induced nano-ripples on PET

Micro/nano-suction cup structure of silicone rubber fabricated by ArF excimer laser

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