Polymer self-assembled nano-structures and surface relief gratings induced with laser at 157nm

Sarantopoulou, E.; Kollia, Z.; Cefalas, A.C.; Douvas, Antonios M.; Chatzichristidi, Margarita; Argitis, Panagiotis; Kobe, Spomenka

doi:10.1016/j.apsusc.2007.02.071

Cited by 18 publications

(11 citation statements)

References 40 publications

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“…These techniques range from surface topography modification [6][7][8] to surface chemistry modification [9][10][11] and have given rise to the increased interest in using polymers as biomaterials [12][13][14][15][16][17][18][19]. Nylon 6,6, the strongest and most abrasive resistant unreinforced nylon, has been used for such biological applications as sutures, tracheal tubes and gastrointestinal segments [20].…”

Section: -Introductionmentioning

confidence: 99%

Wettability and osteoblast cell response modulation through UV laser processing of nylon 6,6

Waugh

Lawrence

2011

Applied Surface Science

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1522 668891 -AbstractWith an ageing population the demand for cheap, efficient implants is ever increasing. Laser surface treatment offers a unique means of varying biomimetic properties to determine generic parameters to predict cell responses. This paper details how a KrF excimer laser can be employed for both laser-induced patterning and whole area irradiative processing to modulate the wettability characteristics and osteoblast cell response following 24 hour and 4 day incubation. Through white light interferometry (WLI) it was found that the surface roughness had considerably increased by up to 1.5 µm for the laser-induced patterned samples and remained somewhat constant at around 0.1 µm for the whole area irradiative processed samples. A sessile drop device determined that the wettability characteristics differed between the surface treatments. For the patterned samples the contact angle, θ, increased by up to 25° which can be attributed to a mixed-state wetting regime.For the whole area irradiative processed samples θ decreased owed to an increase in polar component, γ P . For all samples θ was a decreasing function of the surface energy. The laser whole area irradiative processed samples gave rise to a distinct correlative trend between the cell response, θ and γ P . However, no strong relationship was determined for the laser-induced patterned samples due to the mixed-state wetting regime. As a result, owed to the relationships and evidence of cell differentiation one can deduce that laser whole area irradiative processing is an attractive technology for employment within regenerative medicine to meet the demands of an ageing population.Keywords: Excimer laser, nylon 6,6, wettability, osteoblast cells, bioactivity, regenerative medicine. -IntroductionIt has been realized worldwide within the scientific community and various industries that lasers offer major advantages over alternative techniques for materials processing [1][2][3][4]. Some of the main advantages of using a laser for materials processing are:• Relative cleanliness.• Accurate processing.o Allows much control over the Heat Affected Zone (HAZ) due to the ability of relative precise control over the thermal profile and thermal penetration/absorption.• Precise placement of the beam onto the target material allowing user specified areas of the target material to be processed.• Post-processing techniques required are usually minimal.• Non-contact processing.• Automation (repeatability) of the various processing techniques using a laser is relatively easy to implement.With a large number of different lasers now commercially available it is possible for one to deduce that almost all materials can be processed using a laser due to the wide range of laser parameters that can be utilized. With the many benefits of using lasers for materials processing it has been found that the interest in laser-induced surface treatment has grown, especially within the biomedical industry. This is due to the fact that lasers offer the user a highly selective, rapid...

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Section: -Introductionmentioning

confidence: 99%

Wettability and osteoblast cell response modulation through UV laser processing of nylon 6,6

Waugh

Lawrence

2011

Applied Surface Science

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“…[1] Alternatively, vacuum ultraviolet (VUV) photons are effective for modifying the polymer's surface for optimum functionalization. [2,3] For example, it was reported recently that poly(methyl methacrylate) (PMMA) exhibited a considerable increment of hydrophobicity, and surface and bulk swelling during methanol and ethanol sorption after laser irradiation at 157 nm. The methodology was used to engineer the detection efficiency of chemical and biosensor arrays.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polymeric thin films with vacuum ultraviolet light

Sarantopoulou

Kovač

Kollia

et al. 2008

Surface & Interface Analysis

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Spin-coated poly(methyl methacrylate) (PMMA) thin films on SiO 2 substrate were chemically modified with laser light at 157 nm in nitrogen. Film changes involve bond breaking of polymeric chains, etching, and surface morphological changes. The 157 nm photons mainly dissociate the C-O, C O, and C-H bonds, and catalyze the formation of new C-N bonds. The surface roughness of the irradiated films was changed with the formation of elongated patterns. The film thickness during irradiation was reduced with the rate of 0.005 nm at 1 mJ/cm 2 . Furthermore, the PMMA film forms a thin interface layer with the SiO 2 substrate. Its thickness was reduced following vacuum ultraviolet (VUV) irradiation due to photodissociation of molecules inside the interface layer.

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“…This gives rise to considerably smaller features being achievable with an improved quality of surface modification. Laser surface structuring arises from the ability to focus the laser beam onto specific areas of the target material giving rise to evaporation/ablation of the material, leaving behind unique surface features [50]. Much of the research conducted over the last 10 to 20 years in laser structuring of materials has employed ultra-violet (UV) lasers, excimer lasers in particular.…”

Section: Various Surface Treatments 21 Laser Surface Treatmentmentioning

confidence: 99%

“…With the development of nanotechnology and the interest in how nano-surface engineering affects the wettability characteristics of a material considerable research interest has been observed [50,[81][82][83][84]. For instance, lithography is used in the nano-electronics industry in the fabrication of nano-circuitry and nano-electromechanical systems [85].…”

Section: Lithographymentioning

confidence: 99%

Surface Treatments to Modulate Bioadhesion: A Critical Review

Waugh¹,

Toccaceli²,

Gillett³

et al. 2016

rev adhes adhesives

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On account of the recent increase in importance of biological and microbiological adhesion in industries such as healthcare and food manufacturing many researchers are now turning to the study of materials, wettability and adhesion to develop the technology within these industries further. This is highly significant as the stem cell industry alone, for example, is currently worth £3.5 million in the United Kingdom (UK) alone. This paper reviews the current state-of-the-art techniques used for surface treatment with regards to modulating biological adhesion including laser surface treatment, plasma treatment, micro/nano printing and lithography, specifically highlighting areas of interest for further consideration by the scientific community. What is more, this review discusses the advantages and disadvantages of the current techniques enabling the assessment of the most attractive means for modulating biological adhesion, taking in to account cost effectiveness, complexity of equipment and capabilities for processing and analysis.

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Polymer self-assembled nano-structures and surface relief gratings induced with laser at 157nm

Cited by 18 publications

References 40 publications

Wettability and osteoblast cell response modulation through UV laser processing of nylon 6,6

Wettability and osteoblast cell response modulation through UV laser processing of nylon 6,6

Surface modification of polymeric thin films with vacuum ultraviolet light

Surface Treatments to Modulate Bioadhesion: A Critical Review

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