scholarly journals Novel Coatings to Minimize Corrosion of Titanium in Oral Biofilm

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 342
Author(s):  
Samira Esteves Afonso Camargo ◽  
Tanaya Roy ◽  
Xinyi Xia ◽  
Chaker Fares ◽  
Shu-Min Hsu ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Pure Titanium ◽  
Titanium Implant ◽  
Sem Images ◽  
Force Microscopy ◽  
Inductively Coupled ◽  
Surface Corrosion ◽  
Atomic Force ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

The aim of this work is to investigate the effects produced by polymicrobial biofilm (Porphyromonas gingivalis, Streptococcus mutans, Streptococcus sanguinis, and Streptococcus salivarius) on the corrosion behavior of titanium dental implants. Pure titanium disks were polished and coated with titanium nitride (TiN) and silicon carbide (SiC) along with their quarternized versions. Next, the disks were cultivated in culture medium (BHI) with P. gingivalis, S. mutans, S. sanguinis, and S. salivarius and incubated anaerobically at 37 °C for 30 days. Titanium corrosion was evaluated through surface observation using Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM). Furthermore, the Ti release in the medium was evaluated by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). SEM images showed that coated Ti disks exhibited lower corrosion compared to non-coated disks, except for the quartenized TiN. This was confirmed by AFM, where the roughness was higher in non-coated Ti disks. ICP showed that Ti levels were low in all coating disks. These results indicate that these SiC and TiN-based coatings could be a useful tool to reduce surface corrosion on titanium implant surfaces.

scholarly journals Partitioning and Surficial Segregation of Trace Elements in Iron Oxides in Hydrothermal Fluid Systems

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 57
Author(s):  
Nikolay Smagunov ◽  
Vladimir Tauson ◽  
Sergey Lipko ◽  
Dmitriy Babkin ◽  
Taisa Pastushkova ◽  
...  
Keyword(s):  
Trace Elements ◽  
Inductively Coupled Plasma ◽  
Absorption Spectrometry ◽  
X Ray ◽  
Force Microscopy ◽  
Inductively Coupled ◽  
Atomic Force ◽  
Fluid Systems ◽  
Nonautonomous Phase ◽  
Plasma Mass Spectrometry

Partitioning experiments were done by hydrothermal synthesis of crystals containing trace elements (TEs) by internal sampling of fluid at the temperature of 450 °C and pressure of 1 kbar. The crystal phases obtained were magnetite, hematite, and Ni-spinel, which were studied using X-ray diffraction (XRD), X-ray electron probe microanalysis (EPMA), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), atomic absorption spectrometry (AAS), and atomic force microscopy (AFM). The solutions from the sampler’s fluid probes were analysed by AAS for TEs included elements of the iron group plus aluminium. The highest co-crystallisation coefficients of TE and Fe between mineral and fluid (DTE/Fe) in magnetite were measured for V, Al, Ni and Cr (in decreasing order of n units in value), a lower value was observed for Co (2 × 10−1), and still lower values for Ti, Zn, and Mn (n × 10−2–10−3). In hematite, DTE/Fe values were highest for Al and V (order of n units in value), while lower values characterised Ti, Cr, and Co (n × 10−1–10−3), and the lowest values were exhibited by Cu, Mn, and Zn (n × 10−5). Copper was confirmed to be the most incompatible with all minerals studied; however, Cu had a high content on crystal surfaces. This surficial segregation contributes to the average TE concentration even when a thin layer of nonautonomous phase (NAP) is enriched in the element of interest. The accumulation of TEs on the surface of crystals increased bulk content 1–2 orders of magnitude above the content of structurally-bound elements even in coarse crystals. The inverse problem—evaluation of TE/Fe ratios in fluids involved in the formation of magnetite-containing deposits—revealed that the most abundant metals in fluids were Fe followed by Mn, Zn, and Cu, which comprised 10 to 30% of the total iron content.

Investigation of Antibacterial Effect of Hypericum perforatum L. on Woolen Fabrics

2020 ◽  
Vol 7 (4) ◽  
pp. 22-26
Author(s):  
Fazlıhan Yılmaz
Keyword(s):  
Inductively Coupled Plasma ◽  
Hypericum Perforatum ◽  
Antibacterial Properties ◽  
Sem Images ◽  
Inductively Coupled ◽  
Tin Chloride ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Hypericum Perforatum L ◽  
Dyed Fabric

In this study, Hypericum perforatum L. has been used for dyeing woolen fabrics and improving antibacterial properties. Tin chloride, iron II sulfate, alum and copper II sulfate mordant materials were used to dye wool with Hypericum perforatum L. Dyeings were also performed without using mordant materials. H. perforatum was extracted prior to dyeing. Fourier transform infrared (FTIR), inductively coupled plasma-mass spectrometry (ICP-MS), antibacterial activity, and fastness testing of the dyed fabric samples were performed. Scanning electron microscope (SEM) images of the dyed samples were also examined. It was determined that H. perforatum L. can be used for dyeing woolen fabrics while imparting antibacterial properties.

Single Particle Inductively Coupled Plasma Mass Spectrometry: Investigating Nonlinear Response Observed in Pulse Counting Mode and Extending the Linear Dynamic Range by Compensating for Dead Time Related Count Losses on a Microsecond Timescale

2019 ◽  
Author(s):  
Ingo Strenge ◽  
Carsten Engelhard
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Nonlinear Response ◽  
Dynamic Range ◽  
Dead Time ◽  
Inorganic Nanoparticles ◽  
Linear Dynamic Range ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

<p>The article demonstrates the importance of using a suitable approach to compensate for dead time relate count losses (a certain measurement artefact) whenever short, but potentially strong transient signals are to be analysed using inductively coupled plasma mass spectrometry (ICP-MS). Findings strongly support the theory that inadequate time resolution, and therefore insufficient compensation for these count losses, is one of the main reasons for size underestimation observed when analysing inorganic nanoparticles using ICP-MS, a topic still controversially discussed.</p>

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