Instability of Si3N4/, SiC/, and MoSi2/ethanol suspensions

2003 ◽  
Vol 18 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Yoko Fukada ◽  
Patrick S. Nicholson
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Ammonium Hydroxide ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Tetramethyl Ammonium Hydroxide ◽  
Powder Addition ◽  
The Stability ◽  
Insight Into

Time-dependent suspension behavior is reported for nonoxide ceramic powders (Si3N4, SiC, and MoSi2) in ethanol. The suspension pH (and therefore the stability) changed with time. X-ray photoelectron spectroscopy, inert gas fusion, inductively coupled plasma, and high-resolution transmission electron microscopy were used to track changes of surface chemistry. The adsorption of the base, tetramethyl ammonium hydroxide (TMAH), is examined. The pH drop on powder addition to pure EtOH was used to gain insight into the role of TMAH coverage of the powder surfaces.

Au NPs Loaded Al-MOF@PPy as Excellent Catalyst for the Removal of Organic Pollutants from Water

NANO ◽  
2021 ◽  
pp. 2150002
Author(s):  
Yalu Wu ◽  
Yinyin Xu ◽  
Jingbo Feng ◽  
Yan Zhang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Water Solution ◽  
Catalytic Performance ◽  
Degradation Efficiency ◽  
X Ray ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Growth Method ◽  
Infrared Spectrometer

The novel Al-MOF@PPy@Au nanocomposites were synthesized by an in-situ growth method. The prepared Al-MOF@PPy@Au nanocomposites were characterized by Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectrometer (FTIR), X-ray powder diffraction (XRD), Inductively Coupled Plasma (ICP) and X-ray photoelectron spectroscopy (XPS). The catalytic properties of the prepared Al-MOF@PPy@Au nanocomposites with different content of Au were investigated. The results illustrated that the Al-MOF@PPy@Au(G) with 27.80 wt.% (w/w) Au obtained good catalytic performance. P-nitrophenol (4-NP), methyl orange (MO), methylene blue (MB) and rhodamine B (RhB) were used to test the catalytic degradation of Al-MOF@PPy@Au(G) nanocomposites. The degradation efficiency of the Al-MOF@PPy@Au(G) nanocomposites for 4-NP, MO, MB and RhB reached 92.12%, 93.84%, 93.19% and 92.44% within 25 min, 7 min, 16 min and 2 min, respectively. The Al-MOF@PPy@Au(G) nanocomposites still have good degradation efficiency and good stability for 4-NP within one month being in water. The Al-MOF@PPy@Au(G) nanocomposites can be applied to the real water solution without causing the change of the degradation efficiency.

Inductively Coupled Plasma-Mass Spectrometric Determination of Iodine in Food Using Tetramethyl Ammonium Hydroxide Extraction—Results from a U.S. Food and Drug Administration Level 3 Interlaboratory Study

2019 ◽  
Vol 102 (4) ◽  
pp. 1194-1198 ◽  
Author(s):  
Todor I Todorov ◽  
Yunseol Kim ◽  
Jennifer Fong Sam ◽  
Erica Mote ◽  
Cynthia C Smith ◽  
...  
Keyword(s):  
Drug Administration ◽  
Reference Materials ◽  
Inductively Coupled Plasma ◽  
Food And Drug Administration ◽  
Ammonium Hydroxide ◽  
Mass Spectrometric ◽  
Interlaboratory Study ◽  
Inductively Coupled ◽  
Tetramethyl Ammonium Hydroxide

Abstract Background: The performance of U.S. Food and Drug Administration (FDA) Elemental Analysis Manual (EAM) 4.13 method (Inductively Coupled Plasma-Mass Spectrometric Determination of Iodine in Food Using Tetramethyl Ammonium Hydroxide Extraction) was tested in an interlaboratory study. Objective: The aim of the study is to demonstrate that the FDA EAM method 4.13 is applicable for the analysis of food and multivitamins. Methods: Six collaborators participated in the study using four different models of inductively coupled plasma-mass spectrometry instruments. The method evaluation included determination of the limits of detection and quantification, analysis of National Institute of Standards and Technology standard reference materials (SRMs), unknown samples, blinded SRMs, and fortified analytical portions by all six collaborators. The samples were chosen to represent all sectors of the AOAC food triangle and additionally included pet food and multivitamin tablets. Results: The repeatability and reproducibility ranges were 1.8–11.4% and 3.6–13.7%, respectively; the calculated HorRat values were in the 0.17–1.18 range; and 174 of 175 SRM analyses had z-scores <2 and fortified analytical portion samples with recoveries of 102–105%, indicating acceptable method performance. Conclusions: The study supports a Level Three Multilaboratory Validation according to FDA Food and Veterinary Program Guidelines performed by six collaborators using six certified reference materials and nine unknown samples. Highlights: The method is applicable for quantification of the total extractable iodine in food and multivitamin dietary supplements.

scholarly journals Morphological Transformation of Silver Nanoparticles from Commercial Products: Modeling from Product Incorporation, Weathering through Use Scenarios, and Leaching into Wastewater

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1258 ◽  
Author(s):  
Selvan Mohan ◽  
Juliska Princz ◽  
Banu Ormeci ◽  
Maria C. DeRosa
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Environmental Fate ◽  
Consumer Products ◽  
Morphological Transformation ◽  
Environmental Testing ◽  
X Ray ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Plasma Mass Spectrometry

There is increasing interest in the environmental fate and effects of engineered nanomaterials due to their ubiquitous use in consumer products. In particular, given the mounting evidence that dramatic transformations can occur to a nanomaterial throughout its product lifecycle, the appropriateness of using pristine nanomaterials in environmental testing is being questioned. Using a combination of transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-mass spectrometry (ICP-MS), this work examines the morphological and compositional effects of conditions mimicking a typical lifecycle of a nano-enabled product, from the production of the silver nanoparticle (AgNP)-laden textiles, through its use, laundering, and then finally, its leaching and incubation in the wastewater collection system. These simulated weathering conditions showed evidence for the transformation of AgNPs into AgCl and Ag2S. Incubation in raw wastewater had the most dramatic effect on the AgNPs in terms of transformation, no matter what initial weathering was applied to the NPs prior to incubation. However, despite extensive transformation noted, AgNPs were still present within all the samples after the use scenarios.

scholarly journals Methionine-mediated synthesis of magnetic nanoparticles and functionalization with gold quantum dots for theranostic applications

2017 ◽  
Vol 8 ◽  
pp. 1734-1741 ◽  
Author(s):  
Arūnas Jagminas ◽  
Agnė Mikalauskaitė ◽  
Vitalijus Karabanovas ◽  
Jūrate Vaičiūnienė
Keyword(s):  
Quantum Dots ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Superparamagnetic Iron Oxide ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Initial Stage ◽  
Before And After ◽  
Co Precipitation ◽  
Theranostic Applications

Biocompatible superparamagnetic iron oxide nanoparticles (NPs) through smart chemical functionalization of their surface with fluorescent species, therapeutic proteins, antibiotics, and aptamers offer remarkable potential for diagnosis and therapy of disease sites at their initial stage of growth. Such NPs can be obtained by the creation of proper linkers between magnetic NP and fluorescent or drug probes. One of these linkers is gold, because it is chemically stable, nontoxic and capable to link various biomolecules. In this study, we present a way for a simple and reliable decoration the surface of magnetic NPs with gold quantum dots (QDs) containing more than 13.5% of Au+. Emphasis is put on the synthesis of magnetic NPs by co-precipitation using the amino acid methionine as NP growth-stabilizing agent capable to later reduce and attach gold species. The surface of these NPs can be further conjugated with targeting and chemotherapy agents, such as cancer stem cell-related antibodies and the anticancer drug doxorubicin, for early detection and improved treatment. In order to verify our findings, high-resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), FTIR spectroscopy, inductively coupled plasma mass spectroscopy (ICP-MS), and X-ray photoelectron spectroscopy (XPS) of as-formed CoFe2O4 NPs before and after decoration with gold QDs were applied.

scholarly journals Hydrous Hydrazine Decomposition for Hydrogen Production Using of Ir/CeO2: Effect of Reaction Parameters on the Activity

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1340
Author(s):  
Davide Motta ◽  
Ilaria Barlocco ◽  
Silvio Bellomi ◽  
Alberto Villa ◽  
Nikolaos Dimitratos
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Precipitation Method ◽  
Reaction Conditions ◽  
X Ray ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Icp Ms ◽  
Hydrazine Decomposition

In the present work, an Ir/CeO2 catalyst was prepared by the deposition–precipitation method and tested in the decomposition of hydrazine hydrate to hydrogen, which is very important in the development of hydrogen storage materials for fuel cells. The catalyst was characterised using different techniques, i.e., X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with X-ray detector (EDX) and inductively coupled plasma—mass spectroscopy (ICP-MS). The effect of reaction conditions on the activity and selectivity of the material was evaluated in this study, modifying parameters such as temperature, the mass of the catalyst, stirring speed and concentration of base in order to find the optimal conditions of reaction, which allow performing the test in a kinetically limited regime.

Incubation Layer-Free Nanocrystalline-Si Thin Film Fabricated by ICP-CVD at 150°C for Flexible Electronics

2006 ◽  
Vol 910 ◽  
Author(s):  
Sang-Myeon Han ◽  
Young-Kwan Cha ◽  
Joong-Hyun Park ◽  
Sang-Geun Park ◽  
YoungSoo Park ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Inductively Coupled Plasma ◽  
Chemical Vapor ◽  
Dilution Effect ◽  
Cross Sectional ◽  
Plasma Chemical Vapor Deposition ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Si Films

AbstractThe nc-Si films where the troublesome incubation layer was almost eliminated were deposited by inductively coupled plasma chemical vapor deposition (ICP-CVD) under various dilution conditions. The nc-Si films were analyzed with cross-sectional high resolution transmission electron microscopy (HR-TEM) images. It was verified that the Si crystalline components formed and grew from the surface of buffer layer. The grain size of 20~50nm was measured. The absence of incubation layer in nc-Si film may be attributed mainly to ICP-CVD which generates remote plasma of high density, the role of hydrogen, and the dilution effect on the growth of crystalline. Our experimental results show that incubation-free nc-Si film deposited by ICP-CVD may be suitable for the active layer of bottom gate nc-Si TFTs as well as top gate nc-Si TFTs.

scholarly journals Rhodium Nanoparticles Stabilized by PEG-Tagged Imidazolium Salts as Recyclable Catalysts for the Hydrosilylation of Internal Alkynes and the Reduction of Nitroarenes

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1195
Author(s):  
Guillem Fernández ◽  
Roser Pleixats
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Water Soluble ◽  
X Ray ◽  
Rhodium Nanoparticles ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Internal Alkynes ◽  
Recyclable Catalysts

PEGylated imidazolium (bromide and tetrafluoroborate) and tris-imidazolium (bromide) salts containing triazole linkers have been used as stabilizers for the preparation of water-soluble rhodium(0) nanoparticles by reduction of rhodium trichloride with sodium borohydride in water at room temperature. The nanomaterials have been characterized (Transmission Electron Microscopy, Electron Diffraction, X-ray Photoelectron Spectroscopy, Inductively Coupled Plasma-Optical Emission Spectroscopy). They proved to be efficient and recyclable catalysts for the stereoselective hydrosilylation of internal alkynes, in the presence or absence of solvent, and in the reduction of nitroarenes to anilines with ammonia-borane as hydrogen donor in aqueous medium (1:4 tetrahydrofuran/water).

scholarly journals Surfactant-assisted microwave synthesis of carbon supported MnO2 nanocomposites and their application for electrochemical supercapacitors

Chemija ◽  
2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Jolita Jablonskienė ◽  
Dijana Šimkūnaitė ◽  
Jūratė Vaičiūnienė ◽  
Algirdas Selskis ◽  
Audrius Drabavičius ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
High Specific Capacitance ◽  
Mass Loading ◽  
X Ray ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Scan Rate

MnO2/C nanocomposites have been prepared using a simple onestep microwave heating method by applying different concentrations of cationic surfactant – cetyl trimethylammonium bromide (CTAB). The morphology and composition of the prepared MnO2/C nanocomposites have been investigated using X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and inductively coupled plasma optical emission spectroscopy (ICP-OES). The electrochemical performance of the prepared nanocomposites has been analysed using cyclic voltammetry. It was found that a high specific capacitance (Cs) of 742 F g−1 at a scan rate of 10 mV s−1 in a 1 M Na2SO4 solution has been obtained for the MnO2/C nanocomposite that has the mass loading of 0.140 mg cm−2 and has been synthesized in the absence of CTAB. Meanwhile, the application of CTAB allowed the increase in the mass loading of MnO2 in the nanocomposites. In the presence of CTAB, the highest value of 654 F g−1 at a scan rate of 10 mV s−1 has been obtained for MnO2/C that has the mass loading of 0.570 mg cm−2. This result confirmed a good performance of the prepared MnO2/C nanocomposites as the electrode material for supercapacitors.

scholarly journals Green Synthesis of CuInS2/ZnS Nanocrystals with High Photoluminescence and Stability

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Min Fu ◽  
Weiling Luan ◽  
Shan-Tung Tu ◽  
Leslaw Mleczko
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Shell Growth ◽  
Optical Emission ◽  
Growth Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Zns Nanocrystals

Highly photoluminescent core/shell CuInS2/ZnS (CIS/ZnS) nanocrystals were synthesized. Zinc acetate and dodecanethiol in octadecene solvent were used for shell growth. The structure and composition of QDs were investigated with inductively coupled plasma-optical emission spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. The crystal phase of CIS was tetragonal chalcopyrite. Based on X-ray diffraction analysis, it has been concluded that the growth of the ZnS shell did not affect the phase structure of CuInS2(CIS). Photoluminescence (PL) quantum yield (QY) of CIS increased to 80% after epitaxial growth of ZnS, and the PL emission wavelength can be feasibly tuned to be in the range of 560–710 nm by adjusting shell growth time. The superb photostability with high PL QY of CIS/ZnS nanocrystals is ascribed to the gradient of the chemical composition that has been formed between the core and the shell.

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