Effect of UV radiation damage in air on polymer film thickness, studied by soft X-ray spectromicroscopy

Melo, Lis G. A.; Hitchcock, Adam P.; Susac, Darija; Stumper, Jürgen; Berejnov, Viatcheslav

doi:10.1039/c7cp08621k

Cited by 9 publications

(8 citation statements)

References 53 publications

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“…The OD spectrum is related to the sample properties: OD( x , y , E ) = μ( E ) ρ t ( x , y ), where μ( E ) is the mass absorption coefficient at energy E , ρ is the density, and t ( x , y ) is the thickness of the sample at the ( x , y ) pixel. The spin-coated PFSA film was 50(5) nm thick, as measured by X-ray absorption. , It was uniformly thick to <10 nm over a macroscopically large area (>0.1 × 0.1 mm).…”

Section: Methodsmentioning

confidence: 95%

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Characterization of X-ray Damage to Perfluorosulfonic Acid Using Correlative Microscopy

et al. 2019

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Polymer electrolytes such as perfluorosulfonic acid (PFSA) are key to a variety of electrochemical and clean energy applications. Many analytical techniques for characterizing nanostructured devices containing polymer electrolytes use high-energy electrons or X-rays, which can severely damage soft matter. To better analyze these materials, it is important to understand the chemical, physical, and spectroscopic changes that occur due to radiation damage. Soft X-ray damage to PFSA was characterized using a combination of X-ray microscopy, X-ray absorption spectroscopy, infrared spectroscopy, fluorescence imaging, and atomic force microscopy. X-ray exposure induces substantial and selective loss of fluorine, preferential cleavage of the side chains, and physical ablation of the polymer. The combination of multiple imaging and spectroscopy modalities provides detailed insight into radiation damage mechanisms.

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Section: Methodsmentioning

confidence: 95%

“…The spin-coated PFSA film was 50(5) nm thick, as measured by X-ray absorption. 13,41 It was uniformly thick to <10 nm over a macroscopically large area (>0.1 × 0.1 mm).…”

Section: Methodsmentioning

confidence: 99%

Characterization of X-ray Damage to Perfluorosulfonic Acid Using Correlative Microscopy

et al. 2019

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“…Similarly, STXM was successfully employed in studying the changes in the polymer film thickness that are spincoated as tens of nanometers thick layers. 500 Although this high-end X-ray imaging example still mainly relies on synchrotron facilities, there is a promising development without synchrotron facilities as well. For instance, Sensini et al characterized sub-micron-wide electrospun fibers made of nylon, PLLA, and PLLA−collagen using high-resolution X-ray tomography (XCT).…”

Section: High-resolution X-ray Imagingmentioning

confidence: 99%

“…They demonstrated that STXM was able to distinguish a core diameter and thickness of 40–50 nm, which is otherwise not possible with conventional SEM or TEM techniques. Similarly, STXM was successfully employed in studying the changes in the polymer film thickness that are spincoated as tens of nanometers thick layers . Although this high-end X-ray imaging example still mainly relies on synchrotron facilities, there is a promising development without synchrotron facilities as well.…”

Section: Emerging Techniques For the Surface-sensitive Characterizationmentioning

confidence: 99%

Bioactive Electrospun Fibers: Fabrication Strategies and a Critical Review of Surface-Sensitive Characterization and Quantification

et al. 2021

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Fabricating a porous scaffold with high surface area has been a major strategy in the tissue engineering field. Among the many fabrication methods, electrospinning has become one of the cornerstone techniques due to its enabling the fabrication of highly porous fibrous scaffolds that are of natural or synthetic origin. Apart from the basic requirements of mechanical stability and biocompatibility, scaffolds are further expected to embody functional cues that drive cellular functions such as adhesion, spreading, proliferation, migration, and differentiation. There are abundant distinct approaches to introducing bioactive molecules to have a control over cellular functions. However, the lack of a thorough understanding of cell behavior with respect to the availability and spatial distribution of the bioactive molecules in 3D fibrous scaffolds is yet to be addressed. The rational selection of proper sets of characterization techniques would essentially impact the interpretation of the cell–scaffold interactions. In this timely Review, we summarize the most popular methods to introduce functional compounds to electrospun fibers. Thereafter, the strength and limitations of the conventional characterization methods are highlighted. Finally, the potential and applicability of emerging characterization techniques such as high-resolution/correlative microscopy approaches are further discussed.

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“…Different rates of depletion of polymer coatings are reported to be linked to surface or bulk driven photo-chemical erosion. The initial rate of material erosion is reported to be constant and non-specific to two polymers studied by Melo et al [16].According to Tator [17], polyurethane resins are transparent to short wave UV radiations and they allow them to pass through with very little molecular absorption. Kim et al [18] reported that long term natural weathering on historical monuments degraded the lignin linearly from the surface.…”

Section: The Effect Of Bleaching On the Film Thickness (Ft)mentioning

confidence: 99%

Finishing Properties of Poly Urethane Coating on Bleached and Ammonia Fumigated Mango Wood Surface

Panigrahi

Rout

Sahoo

et al. 2021

IJPSS

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Aims: The impact of bleaching chemicals on the gloss and film thicknesses of poly urethane (PU) coated surface of mango wood (Mangifera indica) with ammonia fumigation and an exposure towards sunlight was investigated Study Design: Thirty six wood samples of size 10.6 cm (length) C 7.62 cm (width) were prepared from 2.5 cm thick kiln dried mango wood (Mangifera indica). Specimens were divided into six groups, each group having 6 samples for the study. Place and Duration of Study: The experiment was carried out in year 2016 at the Laboratory of Forest Product Division, Forest Research Institute, Dehradun, Uttarakhand, India. Methodology: All the samples were sanded with 80 grit size sand paper and coated with poly urethane. Two chemicals were used for bleaching purpose like an aqueous solution of oxalic acid (H2C2O4) was prepared with 30% concentration (by mixing 42.9 g of the solute in 100 ml of hot water) and a commercially available Hydrogen peroxide (H2O2) was used as such (30%). For the purpose of bleaching, these chemicals were applied on to the sanded surfaces using brush at room temperature. The bleached sample surfaces were allowed to dry before proceeding to the next step. The PU (Poly Urethane) coated samples were treated with ammonia fumigation before and after bleached with the two chemicals. Ammonia fumigation was carried out in a fumigation chamber for 24 hours for all the samples (except T1). Results: On exposure to natural sunlight for 60 hours, all the samples showed reduction in film thickness in PU coating but in a wide range of 2.8 % to 11.4%. The highest loss of coating thickness was shown by samples which were neither fumigated nor bleached. Among the fumigated samples, those bleached with oxalic acid resulted in high film thickness loss. Samples bleached with hydrogen peroxide after ammonia fumigation resulted in least film thickness reduction. Both ammonia fumigation and bleaching in general brought down the original gloss of poly urethane coating. The gloss value reduced as expected on exposure to sunlight. Bleaching by hydrogen peroxide prior to ammonia fumigation resulted in highest loss in gloss Conclusion: The un-fumigated and unbleached surface resulted in minimum gloss reduction due to long exposure to sunlight.

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Effect of UV radiation damage in air on polymer film thickness, studied by soft X-ray spectromicroscopy

Cited by 9 publications

References 53 publications

Characterization of X-ray Damage to Perfluorosulfonic Acid Using Correlative Microscopy

Characterization of X-ray Damage to Perfluorosulfonic Acid Using Correlative Microscopy

Bioactive Electrospun Fibers: Fabrication Strategies and a Critical Review of Surface-Sensitive Characterization and Quantification

Finishing Properties of Poly Urethane Coating on Bleached and Ammonia Fumigated Mango Wood Surface

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