Polytetrafluoroethylene coating fragments during neuroendovascular therapy: An analysis of two damaged microguidewires

2021 ◽  
pp. 159101992110151
Author(s):  
Rasmus Holmboe Dahl ◽  
René Wugt Larsen ◽  
Esben Thormann ◽  
Goetz Benndorf
Keyword(s):  
Surface Coating ◽  
Polymer Coating ◽  
Silicone Oil ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Future Studies ◽  
Coating Delamination ◽  
Intravascular Devices ◽  
Exact Origin ◽  
Scanning Electron

Cerebral polymer coating embolism from intravascular devices represents a potentially serious complication to endovascular therapy (EVT). We report two cases of neuroendovascular treatment where filamentous polymer fragments were noted possibly due to damage of the surface coating during manipulation and backloading of microguidewires. As the exact origin of the debris was initially not known, microguidewires and fragments were examined with light microscopy, stereomicroscopy, scanning electron microscopy and attenuated-total-reflection Fourier transform infrared spectroscopy. Fragments consisted of polytetrafluoroethylene and silicone oil stemming from the proximal shaft of a standard microguidewire. To our knowledge, this is the first report of polytetrafluoroethylene coating fragments created during EVT. Future studies should assess the mechanism of polymer coating delamination and its potential consequences during EVT including inadvertent fragment migration into the cerebral circulation.

scholarly journals Study of surface-enhanced infrared absorption spectroscopy (SEIRAS) of black inkjet prints using silver colloid

2017 ◽  
Vol 10 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Michal Oravec ◽  
Katsuya Miura ◽  
Michal Čeppana
Keyword(s):  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Document Analysis ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Infrared Absorption Spectroscopy ◽  
Silver Colloid ◽  
Absorption Signal ◽  
Surface Enhanced ◽  
Scanning Electron

Abstract Only black inkjet prints were studied with regard to forensic examination of documents. We analysed twenty-one inkjet prints using surface-enhanced infrared absorption spectroscopy (SEIRAS). The present paper deals with micro-destructive document analysis based on silver nanoparticles (AgNPs) use to obtain surface enhanced ATR-FTIR (attenuated total reflection - Fourier transform infrared) spectra directly from the document. For this experiment, AgNPs in colloid form was applied. AgNPs for SEIRAS analyses were synthesised and afterwards analysed by scanning electron microscopy (SEM). The purpose of the enhancement of colloids was to improve the resolution of the absorption signal of the analysed samples from noise. In the experiment, the obtained ink ATR-FTIR spectra, with and without silver treatment, were significantly affected by the paper base.

scholarly journals Application of Fluorescent Label in Polymer Nanofibers

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Lucie Zarybnicka ◽  
Radka Bacovska ◽  
Zuzana Nadvornikova ◽  
Numan Almonasy ◽  
Tomas Syrovy
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Fluorescent Probe ◽  
Solid Phase ◽  
Polyamide 6 ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Fluorescent Label ◽  
Microscope Images ◽  
Scanning Electron

The electrospinning of fluorescent probe polyamide 6 doped by 7H-benzimidazo[2,1-a]benzo[de]isoquinolin-7-on is presented as a model processing photoluminescent nanofibers. The presence of the fluorescent probe in the fiber layers was confirmed by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR); the surface nanofiber structure was described by high-resolution fluorescence microscope and scanning electron microscope images. The prepared nanofibers with the fluorescent label were further characterized by fluorescence spectroscopy, both in the solid phase and in the solution.

scholarly journals Pengamatan Surface Plasmon Resonance pada ZnO Nanorods dengan Menggunakan Konfigurasi Prisma/Au/ZnO

2020 ◽  
Vol 23 (1) ◽  
pp. 27
Author(s):  
Rina Dewi Mayasari ◽  
Ajeng Novita Sari ◽  
Aditya Eka Mulyono ◽  
Agus Setyo Budi ◽  
Ratno Nuryadi
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Zno Nanorods ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
X Ray Diffraction ◽  
X Ray ◽  
20 Nm ◽  
Scanning Electron

Pengamatan fenomena surface plasmon resonance (SPR) telah berhasil dilakukan pada ZnO nanorods yang ditumbuhkan di atas lapisan tipis emas. Sistem SPR menggunakan konfigurasi Kretschmann termodifikasi dimana permukaan prisma dideposisi dengan lapisan tipis emas dan ZnO nanorods (prisma/Au/ZnO). Penumbuhan ZnO nanorods menggunakan metode hidrotermal dengan dua tahapan, yaitu pelapisan ZnO seed dan penumbuhan rods. Waktu penumbuhan divariasikan selama 5 menit, 2 jam, dan 4 jam, pada suhu 95 °C yang diikuti dengan annealing pada suhu 500 °C selama 1 jam. Struktur ZnO dikarakterisasi dengan X-ray diffraction (XRD), field emission scanning electron microscope - energy dispersive X-ray spectroscopy (FESEM-EDS), serta diamati fenomena SPR melalui grafik attenuated total reflection (ATR). Hasil karakterisasi menunjukkan bahwa ZnO nanorods (2 jam dan 4 jam) memiliki struktur kristal heksagonal dengan distribusi ukuran diameter pada rentang 20 nm – 60 nm. Fenomena SPR hanya teramati pada nanopartikel ZnO (5 menit) pada sudut SPR (θSPR) 58,2°. Fenomena SPR tidak terlihat pada ZnO nanorods (2 jam dan 4 jam) dikarenakan panjang rods melebihi 100 nm.

scholarly journals Dyeing of Polyester and Polyamide Synthetic Fabrics with Natural Dyes Using Ecofriendly Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Khaled Elnagar ◽  
Tarek Abou Elmaaty ◽  
Sally Raouf
Keyword(s):  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Natural Dyes ◽  
Colour Strength ◽  
Ozone Pretreatment ◽  
Infrared Spectrometer ◽  
Elongation Percentage ◽  
Uv Ozone ◽  
Scanning Electron ◽  
Modification Of The Surface

This work presents an ecofriendly method for dyeing synthetic fabrics with natural dyes using UV/ozone pretreatment to activate fiber and improve dyeability of polyester and nylon. Fabrics are pretreated with UV/ozone for different periods of time ranged from 5 min to 120 min. Effect of pretreatment on surface morphology was studied by scanning electron microscope (SEM). Mechanical behavior was studied by testing tensile strength and elongation percentage. Chemical modification of the surface was studied using attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR). Dyeability of the treated samples was investigated in terms of their colour strength expressed as K/s in addition to fastness to washing and light. This research showed the increment of the affinity of the studied synthetic fabrics towards curcumin and saffron natural dyes using ecofriendly technique.

Direct Synthesis of Pure Radiative Vo2 (M) Plate Like Structures Via Hydrothermolysis at Low Temperature

2012 ◽  
Vol 1406 ◽  
Author(s):  
A. Simo ◽  
L.C. Edomwonyi-Otu ◽  
R. Madjoe ◽  
M. Maaza
Keyword(s):  
Direct Synthesis ◽  
High Surface ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Vibrational Bands ◽  
High Surface Energy ◽  
Scanning Electron

ABSTRACTFacile and direct synthesis of radiative VO2 (M) plate-like is reported. The snowflake material presents superstructures plate-like aggregate with an anisotropic orientation in shape governed by V2O5 and NaOH concentration giving high surface energy liable for chemical reactions with the medium. Pure crystalline VO2 (M) has been obtained with a complete hydrothermolysis of the precursor. The morphological, structural, elemental composition, crystallinity and vibrational bands of the powders were characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Selected Area Electron Diffraction (SAED) and Fourier Transform-Attenuated Total Reflection (FTIR-ATR) infrared spectroscopy.

scholarly journals Effect of Cryostructuring Treatment on Some Properties of Xanthan and Karaya Cryogels for Food Applications

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2788
Author(s):  
Jonathan Coria-Hernández ◽  
Rosalía Meléndez-Pérez ◽  
Abraham Méndez-Albores ◽  
José Luis Arjona-Román
Keyword(s):  
Food Preservation ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Indirect Contact ◽  
Freeze Thaw ◽  
Food Applications ◽  
Novel Material ◽  
Scanning Electron

Cryogels are novel materials because the manufacturing process known as cryostructuring allows biopolymers to change their properties as a result of repeated controlled freeze–thaw cycles. Hydrogels of xanthan and karaya gums were evaluated after undergoing up to four controlled freeze–thaw cycles in indirect contact with liquid nitrogen (up to −150 °C) to form cryogels. Changes in structural, molecular, rheological, and thermal properties were evaluated and compared to those of their respective hydrogels. Samples were also analyzed by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy with Attenuated Total Reflection (FTIR-ATR), Rotational Rheology (RR), Modulated Differential Scanning Calorimetry (MDSC) and zeta potential (ζ). In general, significant differences (p < 0.05) between the numbers of freeze–thaw cycles were found. Karaya cryogels were not stable to repeated cycles of cryostructuring such as the three-cycle xanthan cryogel, which has the best structural order (95.55%), molecular interactions, and thermal stability, which allows the generation of a novel material with improved thermal and structural properties that can be used as an alternative in food preservation.

scholarly journals Comprehensive Multi-Analytical Investigations on the Vietnamese lacquered Wall-Panel “The Return of the Hunters” by Jean Dunand

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Valentina Pintus ◽  
Anthony J. Baragona ◽  
Karin Wieland ◽  
Michael Schilling ◽  
Silvia Miklin-Kniefacz ◽  
...  
Keyword(s):  
Linseed Oil ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Gas Chromatography Mass Spectrometry ◽  
Inorganic Pigments ◽  
Wall Panel ◽  
X Ray ◽  
Scientific Approach ◽  
Materials Used ◽  
Scanning Electron

AbstractThis work presents a comprehensive, multi-analytical scientific approach for determining the type of lacquer and artistic materials used by Jean Dunand on his work “The Return of the Hunters” (1935). For this purpose, thermally assisted hydrolysis and methylation – gas chromatography/mass spectrometry (THM-GC/MS), optical microscopy (OM) in visible (Vis) and ultraviolet light (UV), and scanning electron microscopy - energy-dispersive X-ray spectroscopy (SEM-EDX) were selected. Furthermore, a novel application of micro attenuated total reflection Fourier transform infrared (µATR-FTIR) spectroscopic mapping by univariate and multivariate analysis was applied for studying the complex lacquer paint stratigraphy. The results show that Vietnamese lacquer was used as a binder, mixed together with linseed oil and pine resins as additives in combination with inorganic pigments, and that shellac was included on the top of the paint; they document an important step in the story of the transfer of Vietnamese lacquer painting techniques to Europe.

scholarly journals Analysis of paint traces to determine the ship responsible for a collision

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Lee ◽  
D. Lee ◽  
J. M. Seo
Keyword(s):  
Electron Microscopy ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
X Ray ◽  
Pyrolysis Gas Chromatography ◽  
Ship Collision ◽  
Derivative Thermogravimetry ◽  
Scanning Electron

AbstractAlthough there have been many instances of ship collision at sea in recent times, not much research has been conducted on the topic. In this study, paint from an actual site of ship collision was collected and analyzed as evidence. The amount of evidence collected from the ships involved in the collision is either small or has inconsistent morphology. In addition, the contaminants and samples are often mixed in this evidence, making its analysis difficult. Paint traces of the damaged ship and the ship suspected to be responsible for the collision were compared through scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM–EDS), attenuated total reflection–Fourier transform infrared spectroscopy (ATR–FTIR), thermogravimetry (TG) and derivative thermogravimetry (DTG), and pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS) analyses. The ship responsible for the collision could be identified by characterization and by performing a comparative analysis of the extracted paint. Among the methods used in this study, Py–GC/MS can sensitively analyze even similar paints, and identified styrene and phthalic anhydride as the most prominent components of the paint used as evidence. The results obtained can be used to investigate the evidence collected from collision sites and to determine the ship responsible for the collision.

Competitive Self-Assembly Manifests Supramolecular Darwinism in Soft-Oxometalates

2015 ◽  
Vol 03 (01n02) ◽  
pp. 1540008 ◽  
Author(s):  
Santu Das ◽  
Saurabh Kumar ◽  
Apabrita Mallick ◽  
Soumyajit Roy
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Inorganic Materials ◽  
Time Dependent ◽  
Length Scale ◽  
Topological Transformation ◽  
Two Component ◽  
Scanning Electron

Topological transformation manifested in inorganic materials shows manifold possibilities. In our present work, we show a clear topological transformation in a soft-oxometalate (SOM) system which was formed from its polyoxometalate (POM) precursor [ PMo 12 @Mo 72 Fe 30]. This topological transformation was observed due to time dependent competitive self-assembly of two different length scale soft-oxometalate moieties formed from this two-component host–guest reaction. We characterized different morphologies by scanning electron microscopy, electron dispersive scattering spectroscopy, dynamic light scattering, horizontal attenuated total reflection–infrared spectroscopy and Raman spectroscopy. The predominant structure is selected by its size in a sort of supramolecular Darwinian competition in this process and is described here.

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