The signal from one of the constituting elements is monitored as a function of time, thus each detected NP will produce a narrow signal peak (a few hundred μs duration), the height of which is proportional to the mass of the analyte present in the NP. The nanoparticles get atomized and ionized in the plasma. 12–15 In this technique, sensitive ICP-MS spectrometers are used in the time-resolved mode for the measurement of dilute nanodispersions (particle concentrations less than 10 5 mL −1 are adequate). Single particle, or particle-mode, ICP-MS (spICP-MS) is a novel nanoparticle (NP) characterization technique, which is recently gaining increasing attention in the literature owing to its versatility and high throughput. For the determination of the concentration of the active metallic component, solution-mode inductively coupled plasma mass spectrometry (ICP-MS), 6–8 scanning electron microscopy coupled with energy dispersive spectroscopy (SEM-EDS) 9,10 or X-ray photoelectron spectroscopy (XPS) 11 is typically used in the literature. in heterogeneous catalysis, 1,2 sensors, 3 electrochemical 4 or fuel cell 5 research. One of the key parameters assessed is the relative concentration (wt%) of the active metal and the supporting metal–oxide nanoparticle, as this has significant influence on the activity, selectivity and performance, as was shown e.g. The reliable and quick characterization of the synthesized nanomaterials is obviously crucial both in terms of morphology and structure and composition. Introduction Novel metal/metal–oxide nanocomposites are in the focus of intense fundamental research, not only due to their unique characteristics, but also because of their already found several industrial uses in the area of medicine, sensors, energy storage, structural materials or as heterogeneous catalysts for the processing of chemicals or environmental pollutants. The spICP-MS result was concordant with the result obtained by TEM imaging, whereas SEM-EDS, XPS and solution-mode ICP-MS strongly overestimated the concentration. Although the individual measurement of ultra small nanoparticles is not yet possible by spICP-MS, the cumulative signal from such load particles in a nanocomposite allows the accurate determination of the load concentration. This technique works directly with dispersions, the measurement only takes a few minutes, it gives highly reliable results, largely free from interference from precursor residues and can also provide additional information about the particles. After experimentally testing and discussing the pros and cons of each analytical technique, it was found that spICP-MS is one of the most accurate, precise and practical techniques for the analysis of nanocomposites. Four of the techniques (SEM-EDS, TEM imaging, XPS and solution-mode ICP-MS) are often used for the characterization of nanoparticles, whereas single particle ICP-MS (spICP-MS) is an upcoming, novel methodology. Well Services solidifies ProFrac’s position as an industry leader in electric hydraulic fracturing, which we believe represents the future of the industry… It is a true win-win scenario for us, our customers, the environment and the communities in which we operate.In this study, the performance of five analytical techniques applicable to the determination of the load concentration of ultra small nanoparticles in a Pt/SiO 2 nanocomposite was critically evaluated. The transaction expands ProFrac’s fleet to 44 active fleets by yearend, including 13 tier IV dual fuel fleets and 3 tier IV diesel fleets. Enverus values the deal at $226.6 million. Well Services creates the largest provider of electric frac services with 12 electric fleets, and also it gives ProFrac access to USWS’ leading intellectual property, including more than 110 patents, that produced the market’s first e-fleet deployment in 2014. Matt Wilks, ProFrac executive chairman, said the deal for subsidiaries of Signal Peak Silica will “expand our total to three in-basin sand mines” and give ProFrac sand production annual capacity of 6 million tons.Įnverus said ProFrac’s acquisition of U.S. SP Silica provides nearly 3 million tons of annual sand production capacity and nearly 25,000 tons of on-site storage. ![]() Well Services, a leading provider of electric pressure pumping services, in a stock transaction. said last month it agreed to acquire SP Silica and SP Silica Sales of Monahans for $90 million and U.S.
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