Monitoring Carbon in Electron and Ion Beam Deposition within FIB-SEM

Farr, Nicholas T. H.; Hughes, Gordon; Rodenburg, Cornelia

doi:10.3390/ma14113034

Cited by 24 publications

(16 citation statements)

References 44 publications

(66 reference statements)

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“…Figure 6D,E show the SE spectra (SES) generated. In previously published SEHI data, a SE Ti peak was identified at 4.9–5.3 eV, with Ti oxides found in a peak range of 5.5–6.2 eV 20 . Both of these peaks are apparent in all SES spectra collected.…”

Section: Resultsmentioning

confidence: 72%

“…In previously published SEHI data, a SE Ti peak was identified at 4.9-5.3 eV, with Ti oxides found in a peak range of 5.5-6.2 eV. 20 Both of these peaks are apparent in all SES spectra collected. We can therefore confirm that Ti is still present on the surface of both explanted Ti-PP meshes.…”

Section: Sehi Is a Novel Highly Surface Sensitive Technique That Has ...mentioning

confidence: 80%

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Characterization in respect to degradation of titanium‐coated polypropylene surgical mesh explanted from humans

2023

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Titanium-coated polypropylene (Ti-PP) mesh was introduced in 2002 as a surgical mesh for the treatment of hernias and shortly after for pelvic floor surgery, with the aim of improving biocompatibility when compared to non-titanised/regular PP mesh implants. The application of a titanium coating could also be beneficial to address concerns regarding the exposure of PP in an in vivo environment. Many studies have shown that PP, although it is widely accepted as a stable polymer, is subject to oxidation and degradation, such degradation affects the mechanical behavior, that is, the stiffness and tensile strength of PP mesh. Despite the wide clinical use of Ti-PP surgical meshes, no study has yet investigated the residual material properties post clinical deployment and subsequent explantation. In this study, two explanted Ti-PP mesh samples each having different incorporation durations from two patients were examined. Material analysis conducted within this study includes the following techniques: attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, low voltagescanning electron microscopy (LV-SEM), backscattered electron (BSE) imaging, energy dispersive X-ray spectroscopy (EDS) and secondary election hyperspectral imaging (SEHI). The hypothesis of this study is that the Ti coating successfully shields the PP mesh from oxidative stress in vivo and thus protects it from degradation. The results of this analysis show for the first time evidence of bulk oxidation, surface degradation, and environmental stress cracking on explanted Ti-PP meshes.

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Section: Resultsmentioning

confidence: 72%

Section: Sehi Is a Novel Highly Surface Sensitive Technique That Has ...mentioning

confidence: 80%

Characterization in respect to degradation of titanium‐coated polypropylene surgical mesh explanted from humans

2023

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“…SEHI data collection and processing: The methodology of the application of SEHI has been published in depth previously [ 23 , 24 , 25 , 26 ]. Briefly, SE spectra generation was performed on PGS-M using the Helios FEI Helios G4 CX DualBeam microscope by applying consistent operating conditions of 1 kV and a 50 pA immersion mode.…”

Section: Methodsmentioning

confidence: 99%

“…Secondary electron hyperspectral imaging (SEHI) is a multiscale material characterisation technique applied within a scanning electron microscope (SEM). SEHI is based on the collection of secondary electron (SE) emission spectra [ 11 , 12 , 13 , 14 , 15 ] at low primary beam energies, making the technique applicable to the chemical inspection of uncoated polymer surfaces [ 4 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ] as well as metals [ 23 ]. SE spectra for some hydrocarbon materials have been found to be influenced by the excitation of intramolecular vibrations [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Revealing Localised Mechanochemistry of Biomaterials Using In Situ Multiscale Chemical Analysis

Farr

2022

Materials

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The study of mechanical and chemical phenomena arising within a material that is being subjected to external stress is termed mechanochemistry (MC). Recent advances in MC have revealed the prospect not only to enable a greener route to chemical transformations but also to offer previously unobtainable opportunities in the production and screening of biomaterials. To date, the field of MC has been constrained by the inability of current characterisation techniques to provide essential localised multiscale chemically mapping information. A potential method to overcome this is secondary electron hyperspectral imaging (SEHI). SEHI is a multiscale material characterisation technique applied within a scanning electron microscope (SEM). Based on the collection of secondary electron (SE) emission spectra at low primary beam energies, SEHI is applicable to the chemical assessment of uncoated polymer surfaces. Here, we demonstrate that SEHI can provide in situ MC information using poly(glycerol sebacate)-methacrylate (PGS-M) as an example biomaterial of interest. This study brings the use of a bespoke in situ SEM holder together with the application of SEHI to provide, for the first time, enhanced biomaterial mechanochemical characterisation.

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“…The detection of C in all samples could be due to sources of contamination inherent to the instrument (e.g., small drops of oil from the vacuum pumps or remains of previous samples) or contamination resulting from the sample preparation and handling process (e.g., from sanding or from carbon tape used to adhere the sample). [43,44] 4 | CONCLUSIONS Cerium molybdate and aluminum molybdate were synthesized by precipitation at controlled pH. Both solids are partially soluble in aqueous NaCl solutions, thus providing two ionic species with aluminum corrosion inhibiting properties: the trivalent cations Ce(III) and Al(III), and molybdate anions.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions

Byrne,

Quesada Cangahuala,

D'Alessandro

et al. 2023

Materials & Corrosion

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Cerium molybdate and aluminum molybdate were synthesized by precipitation at controlled pH. The inhibitory properties of these solids on the corrosion process of aluminum in near‐neutral aqueous NaCl solutions were studied. Potentiodynamic polarization curves showed that both molybdates act as mixed‐type inhibitors. This is due to molybdate anion acts as an anodic inhibitor, while the trivalent cations Ce(III) and Al(III) have an inhibitory effect on the cathodic reaction. Linear polarization tests demonstrated a large increase in polarization resistance when these solids are added, resulting in an inhibition efficiency of 97% in both cases. Scanning electron microscopy and X‐ray energy dispersive microanalysis of the exposed surfaces revealed the formation of compact protective films rich in Mo and with no detectable Cl levels.

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Monitoring Carbon in Electron and Ion Beam Deposition within FIB-SEM

Cited by 24 publications

References 44 publications

Characterization in respect to degradation of titanium‐coated polypropylene surgical mesh explanted from humans

Characterization in respect to degradation of titanium‐coated polypropylene surgical mesh explanted from humans

Revealing Localised Mechanochemistry of Biomaterials Using In Situ Multiscale Chemical Analysis

Cerium and aluminum molybdates as inhibitors of the aluminum AA1050 corrosion process in aqueous NaCl solutions

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