Surface free energy analysis of poly(HEMA)‐poly(perfluoroacrylate) copolymer networks

Eroğlu, Mehmet S.

doi:10.1002/app.23936

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…Over the glass-transition temperature, because polymers undergo substantial segmental rotations and movements, their surface presents a dynamic nature. In nonpolar environments (e.g., air), the density of hydrophobic groups on the surface increases, whereas in a polar environment, the polar groups are oriented toward the surface, which becomes more energetic. − …”

Section: Resultsmentioning

confidence: 99%

Levan Nanostructured Thin Films by MAPLE Assembling

Sima

Mutlu²,

Eroğlu

et al. 2011

Biomacromolecules

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Synthesis of nanostructured thin films of pure and oxidized levan exopolysaccharide by matrix-assisted pulsed laser evaporation is reported. Solutions of pure exopolysaccharides in dimethyl sulfoxide were frozen in liquid nitrogen to obtain solid cryogenic pellets that have been used as targets in pulsed laser evaporation experiments with a KrF* excimer source. The expulsed material was collected and assembled onto glass slides and Si wafers. The contact angle studies evidenced a higher hydrophilic behavior in the case of oxidized levan structures because of the presence of acidic aldehyde-hydrogen bonds of the coating formed after oxidation. The obtained films preserved the base material composition as confirmed by Fourier transform infrared spectroscopy. They were compact with high specific surface areas, as demonstrated by scanning electron and atomic force microscopy investigations. In vitro colorimetric assays revealed a high potential for cell proliferation for all coatings with certain predominance for oxidized levan.

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Section: Resultsmentioning

confidence: 99%

Levan Nanostructured Thin Films by MAPLE Assembling

Sima

Mutlu²,

Eroğlu

et al. 2011

Biomacromolecules

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“…In addition, the SFE of the laser‐processing surface had a higher polar part than the dispersive part, and the polar part comprised all‐electron donor–acceptor interactions and hydrogen bonding. [ 40 ] This result revealed that the hydrogen bonding and chemical bonding also contributed to the joining. A higher W ad meant that there was a higher affinity and intermolecular force between the laser‐processing surface and the CFRP, and it was easier to form hydrogen and chemical bonding during FLJ.…”

Section: Resultsmentioning

confidence: 96%

“…Surface free energy of experimental liquid. [40] Liquid Total surface tension γ L [mN m À1 ] calculation considerably because the groove with high curvature will have a higher SFE than measured.…”

Section: Adhesion Properties Of Laser-processing Surface and Bonding ...mentioning

confidence: 99%

“…Due to the low laser power, only small grooves with small depths were formed on the Al surface after each scan. To obtain the optimum surface structure, different parameters of the laser processing including scanning speeds (3000, 5000, and 7000 mm min À1 ), hatch distances (0.15-0.5 mm), and the frequency and the power (100 kHZ and 100 W), as well as the number of scans (1,5,10,20,40) were employed previously. [22] An optimized laser-processing parameter was as follows: power of 100 W, pulse frequency of 100 kHz, scan speed of 7000 mm min À1 , hatch distance of 0.4 mm.…”

Section: Laser-processing Pretreatmentmentioning

confidence: 99%

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Achieving a Strong Friction‐Lap Joint of Continuous Carbon‐Fiber‐Reinforced Plastic/Aluminum Alloy via a Surface Laser‐Processing Pretreatment

Jiang

Liu

et al. 2023

Adv Eng Mater

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It is difficult to achieve high‐strength joints of metals to carbon‐fiber‐reinforced plastics (CFRPs) with high contents of continuous fibers with the poor fluidity. Herein, a special designed laser‐processing pretreatment is conducted on the surface of 5052Al, and friction‐lap joining (FLJ) is employed to join pretreated 5052Al to the CFRP with 50%–55% fiber content. The maximal tensile shear force and strength reach 4.06 kN and 18.04 MPa, respectively, with an increment of 72% compared to the untreated sample. It is the first time to achieve the high‐strength joint of Al alloys to CFRPs with high contents of continuous fibers via FLJ. The joining area and adhesion work are quantified by theoretical calculations, and the residual stresses are visualized by finite‐element analysis. The laser‐processing pretreatment changes the plain Al alloy surface structure into the rough and porous structure, largely increasing the mechanical interlocking effect of the joint, and also changes the Al alloy surface wetting behavior and increases the adhesion work from 59.66 to 81.17 mN m−1. That largely changes the chemical reaction feature between the CFRP and Al alloy, resulting in their tight bonding. In addition, the residual stresses weaken, which further improve the tight bonding effect.

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“…The dynamics of polymers at surface is substantially altered especially when some solvent molecules induce rearrangements. Totally different to rigid ceramic or metal materials, the composition of the polymer varies also with the depth [139]. The morphology is quite similar for L and OL thin films obtained by MAPLE exhibiting a spatial orientation due to a collective influence of evaporation-induced assembly with the specific linkages of the linear structures of polysaccharides.…”

Section: Nanostructured Levan Thin Filmsmentioning

confidence: 94%

Biopolymer Thin Films Synthesized by Advanced Pulsed Laser Techniques

Axente¹,

Sima²,

Ristoscu³

et al. 2016

Recent Advances in Biopolymers

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This chapter provides an overview of recent advances in the field of laser-based synthesis of biopolymer thin films for biomedical applications. The introduction addresses the importance of biopolymer thin films with respect to several applications like tissue engineering, cell instructive environments, and drug delivery systems. The next section is devoted to applications of the fabrication of organic and hybrid organic-inorganic coatings. Matrix-assisted pulsed laser evaporation (MAPLE) and Combinatorial-MAPLE are introduced and compared with other conventional methods of thin films assembling on solid substrates. Advantages and limitations of the methods are pointed out by focusing on the delicate transfer of bio-macromolecules, preservation of properties and on the prospect of combinatorial libraries' synthesis in a single-step process. The following section provides a brief description of fundamental processes involved in the molecular transfer of delicate materials by MAPLE. Then, the chapter focuses on the laser synthesis of two polysaccharide thin films, namely Dextran doped with iron oxide nanoparticles and Levan, followed by an overview on the MAPLE synthesis of other biopolymers. The chapter ends with summary and perspectives of this fast-expanding research field, and a rich bibliographic database.

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Surface free energy analysis of poly(HEMA)‐poly(perfluoroacrylate) copolymer networks

Cited by 7 publications

References 31 publications

Levan Nanostructured Thin Films by MAPLE Assembling

Levan Nanostructured Thin Films by MAPLE Assembling

Achieving a Strong Friction‐Lap Joint of Continuous Carbon‐Fiber‐Reinforced Plastic/Aluminum Alloy via a Surface Laser‐Processing Pretreatment

Biopolymer Thin Films Synthesized by Advanced Pulsed Laser Techniques

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