Pulsed laser deposition of smooth poly(methyl methacrylate) films at 248nm

Organic films can be produced either by MAPLE or directly by PLD (Pulsed laser deposition). For a reasonable deposition rate of ng/cm 2 per pulse for film production by MAPLE a fluence of 1-1.5 J/cm 2 is required at the laser wavelength of 355 nm, while the fluence can be considerably lower at 248 nm. At high fluence the deposition rate of proteins by MAPLE seems to decrease. The surface roughness is still an issue, but at low fluence it seems to be acceptable. The fragmentation rate increases with fluence, and seems to be less pronounced for MAPLE than for PLD. Also this issue is not yet resolved.

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“…At higher fluence (> 0.5 J/cm 2 ) the PMMA films exhibit a pronounced roughness and a high number of droplets [40].…”

Section: Surface Morphology Of Maple-and Pld-filmsmentioning

confidence: 99%

A study on matrix assisted pulsed evaporation (MAPLE) of organic materials

Matei¹,

Canulescu²,

Constantinescu³

et al. 2012

AIP Conference Proceedings

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“…The background pressure within the deposition chamber was lower than 5 × 10 −8 mbar. All PMMA films investigated in this study were deposited using a laser fluence of about 125 mJ/cm 2 and were smooth without any droplets as described in [10]. Films of thicknesses between 100 nm and 30 µm were grown at different substrate temperatures.…”

Section: Methodsmentioning

confidence: 99%

“…In the literature, it was claimed that smooth films can only be obtained for strong absorbing materials [1,2]. But in an earlier work, we already showed that for PMMA completely smooth films (with a surface roughness of less than 1 nm) can be grown without any droplets by PLD in a narrow fluence range slightly above the deposition threshold [10] also when using a laser wavelength of 248 nm, where the absorption of the laser radiation is only 500 cm −1 [11].…”

Section: Introductionmentioning

confidence: 99%

Hardening of smooth pulsed laser deposited PMMA films by heating

et al. 2009

Self Cite

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Smooth poly(methyl methacrylate) (PMMA) films without any droplets were pulsed laser deposited at a wavelength of 248 nm and a laser fluence of 125 mJ/cm 2 . After deposition at room temperature, the films possess low universal hardness of only 3 N/mm 2 . Thermal treatments up to 200°C, either during deposition or afterwards, lead to film hardening up to values of 200 N/mm 2 . Using a combination of complementary methods, two main mechanisms could be made responsible for this temperature induced hardening effect well above the glass transition temperature of 102°C. The first process is induced by the evaporation of chain fragments and low molecular mass material, which are present in the film due to the ablation process, leading to an increase of the average molecular mass and thus to hardening. The second mechanism can be seen in partial cross-linking of the polymer film as soon as chain scission occurs at higher temperatures and the mobility and reactivity of the polymer material is high enough.

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“…Excimer lasers have been more commonly implemented for this technique as the absorption coefficient of materials increases at shorter laser wavelengths and is a major benefit as it allows greater control of the deposited layer thickness [73]. With specific regard to polymeric materials smooth thin films of poly(methyl methacrylate) (PMMA) can be produced using relatively high energy densities [71] and by using these high energy densities, the chemical structure can be modulated [71,72]. The work of Cristescu et al [72] compared pulsed laser deposition with matrix-assisted pulsed laser evaporation (MAPLE), and concluded that pulsed laser deposition of pullulan (a polymeric biomaterial) could not be used with this technique as resulting thin films had a different composition.…”

Section: Figure 4: Sem Images Femtosecond Laser Periodic High Spatialmentioning

confidence: 99%

“…Laser modification of surfaces for the prevention of bacterial attachment could provide a high value technique for producing nanostructured surfaces with superhydrophobicity which could prevent or control the attachment of bacteria to polymeric biomaterials and other important surfaces. For the production of thin film materials, pulsed laser deposition has been widely implemented [71][72][73] with excimer lasers been somewhat the most common laser to conduct pulsed laser deposition [73]. Excimer lasers have been more commonly implemented for this technique as the absorption coefficient of materials increases at shorter laser wavelengths and is a major benefit as it allows greater control of the deposited layer thickness [73].…”

Section: Figure 4: Sem Images Femtosecond Laser Periodic High Spatialmentioning

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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Pulsed laser deposition of smooth poly(methyl methacrylate) films at 248nm

Cited by 21 publications

References 13 publications

A study on matrix assisted pulsed evaporation (MAPLE) of organic materials

A study on matrix assisted pulsed evaporation (MAPLE) of organic materials

Hardening of smooth pulsed laser deposited PMMA films by heating

Surface Treatments to Modulate Bioadhesion: A Critical Review

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