Laser interference lithography as a new and efficient technique for micropatterning of biopolymer surface

Yu, Fayou; Li, Ping; Shen, Hao; Mathur, Sanjay; Lehr, Claus‐Michael; Bakowsky, Udo; Mücklich, Frank

doi:10.1016/j.biomaterials.2004.07.021

Cited by 79 publications

(51 citation statements)

References 24 publications

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“…Some of these methods are radiation grafting [17], plasma surface modification [18,19] and using various coatings [20]. Another method which has the ability to produce surface modifications is that of laser treatment [21,22] and offers a number of benefits such as accurate, precise, non-contact and clean processing. One other major advantage that lasers offer over other competing techniques is that they can produce micro and nano scale topographical and surface chemical variations with negligible affect to the bulk properties of the material.…”

Section: -Introductionmentioning

confidence: 99%

Interaction of CO2 laser-modified nylon with osteoblast cells in relation to wettability

Waugh

Lawrence

Morgan

et al. 2009

Materials Science and Engineering: C

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2 -AbstractIt has been amply demonstrated previously that CO 2 lasers hold the ability to surface modify various polymers. In addition, it has been observed that these surface enhancements can augment the biomimetic nature of the laser irradiated materials. This research has employed a CO 2 laser marker to produce trench and hatch topographical patterns with peak heights of around 1 μm on the surface of nylon 6,6. The patterns generated have been analysed using white light interferometery, optical microscopy and X-ray photoelectron spectroscopy was employed to determine the surface oxygen content. Contact angle measurements were used to characterize each sample in terms of wettability.

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Section: -Introductionmentioning

confidence: 99%

Interaction of CO2 laser-modified nylon with osteoblast cells in relation to wettability

Waugh

Lawrence

Morgan

et al. 2009

Materials Science and Engineering: C

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“…Laser surface modification [16,17] is another process which has the ability to modify both the topography and surface chemistry of a material with negligible affect to the bulk properties. In comparison to other competing techniques lasers offer a number of benefits such as relative cleanliness, accurate processing, non-contact and flexible processing.…”

Section: -Introductionmentioning

confidence: 99%

On the effects of using CO2 and F2 lasers to modify the wettability of a polymeric biomaterial

Waugh

Lawrence

Walton

et al. 2010

Optics & Laser Technology

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-AbstractEnhancement of the surface properties of a material by means of laser radiation has been amply demonstrated previously. In this work a comparative study for the surface modification of nylon 6,6 has been conducted in order to vary the wettability characteristics using CO 2 and excimer lasers. This was done by producing 50 μm spaced (with depths between 1 and 10 μm) trench-like patterns using various laser parameters such as varying the laser power for the CO 2 laser and number of pulses for the excimer laser. Topographical changes were analysed using optical microscopy and white light interferometry which indicated that both laser systems can be implemented for modifying the topography of nylon 6,6.Variations in the surface chemistry were evaluated using energy-dispersive X-ray spectroscopy and x-ray photoelectron spectroscopy analysis and showed that the O 2 increased by up to 1.5% At. and decreased by up to 1.6% At. for the CO 2 and F 2 laser patterned samples, respectively. Modification of the wettability characteristics was quantified by measuring the advancing contact angle, which was found to increase in all instances for both laser systems. Emery paper roughened samples were also analysed in the same manner to determine that the topographical pattern played a major role in the wettability characteristics of nylon 6,6. From this, it is proposed that the increase in contact angle for the laser processed samples is due to a mixed intermediate state wetting regime owed to the periodic surface roughness brought about by the laser induced trench-like topographical patterns.Keywords: CO 2 laser, F 2 laser, nylon 6,6, wettability, contact angle. -IntroductionThe study of wettability has been a major focal point for many researchers and has been applied to a wide range of applications such as biomedical [1][2][3][4], coating technologies [5,6] and adhesion [7][8][9]. As the interface between a solid and liquid can be very complex it is necessary to account for the wetting regime that takes place. Two of the most common wetting regimes is that of Wenzel and Cassie-Baxter. In most instances it is seen that for hydrophilic surfaces (surfaces which provide contact angles of less than 90°) the Wenzel wetting regime dominates in which the whole of the liquid wets the surface. For hydrophobic surfaces (contact angles greater than 90°) the wetting regime tends to be that of Cassie-Baxter in which air-gaps are formed between the liquid-solid interface. However, in some cases it has been seen that it may be possible for a hydrophilic surface to give rise to some form of Cassie-Baxter wetting or CassieBaxter/Wenzel mixed intermediate wetting regime owed to the roughness and topographical pattern on the surface [10,11]. In this instance it is seen in some cases that increasing the surface roughness, through the patterning of a surface, can give rise to an increase in contact angle for hydrophilic materials. On the other hand, it has also been observed that in general, when the surface energy and its components are a ...

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“…[20] However, to the best of our knowledge, this method has not been used to produce patterns directly on CPs. Furthermore, PANI can be polymerized onto different substrates (i.e., glass, gold, and different polymers including low-density polyethylene among others) using suitable oxidants with a good adherence.…”

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confidence: 99%

Simple Fabrication Method of Conductive Polymeric Arrays by Using Direct Laser Interference Micro‐/Nanopatterning

et al. 2007

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Thin films of polyaniline (PANI) deposited onto different polymeric substrates are nanostructured by using “direct laser interference patterning” at room temperature and pressure in air atmosphere. Regular linelike arrays (see figure) with thicknesses up to 600 nm are fabricated and their activity is determined using different techniques. The structuring mechanisms of PANI supported in both polycarbonate and polyimide films are demonstrated using cross‐sectional analyses performed with a dual‐beam workstation.

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Laser interference lithography as a new and efficient technique for micropatterning of biopolymer surface

Cited by 79 publications

References 24 publications

Interaction of CO2 laser-modified nylon with osteoblast cells in relation to wettability

Interaction of CO2 laser-modified nylon with osteoblast cells in relation to wettability

On the effects of using CO2 and F2 lasers to modify the wettability of a polymeric biomaterial

Simple Fabrication Method of Conductive Polymeric Arrays by Using Direct Laser Interference Micro‐/Nanopatterning

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