KLn(MoO4)2 micro/nanocrystals (Ln = La-Lu, Y): systematic hydrothermal crystallization, structure, and the performance of doped Eu3+ for optical thermometry

2021 ◽  
Author(s):  
Zhixin Xu ◽  
Panpan Du ◽  
Qi Zhu ◽  
Xiaodong Li ◽  
Xudong Sun ◽  
...  
Keyword(s):  
Hydrothermal Reaction ◽  
Double Molybdate ◽  
Hydrothermal Crystallization ◽  
Lanthanide Elements ◽  
Optical Thermometry ◽  
The Family ◽  
Optimized Conditions ◽  
Crystallization Structure

Systematic crystallization of KLn(MoO4)2 double molybdate micro/nanocrystals was achieved in this work for the family of lanthanide elements (excluding Pm) and Y via hydrothermal reaction under the optimized conditions of...

What Are Rare Earths?

2017 ◽  
Author(s):  
Sophia Kalantzakos
Keyword(s):  
Rare Earths ◽  
Environmental Risks ◽  
High Tech ◽  
Lanthanide Elements ◽  
Low Concentrations ◽  
The Family ◽  
Processing Techniques

Rare earths are seventeen elements essential for hundreds of applications in renewables, high-tech, and defense. They include the family of lanthanide elements, as well as yttrium and scandium, and are divided into two main categories: light and heavy. They are called “rare” because of the low concentrations in which they are found and because it is difficult to mine and process them. This chapter catalogues a range of their most important uses for different industries and provides an overview of processing techniques and the serious environmental risks that accompany them. Finally, it examines the possibilities and limitations of recycling and substitution.

scholarly journals Hydrothermal crystallization of a Ln2(OH)4SO4·nH2O layered compound for a wide range of Ln (Ln = La–Dy), thermolysis, and facile transformation into oxysulfate and oxysulfide phosphors

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13331-13339 ◽  
Author(s):  
Xuejiao Wang ◽  
Ji-Guang Li ◽  
Maxim S. Molokeev ◽  
Xiaojun Wang ◽  
Weigang Liu ◽  
...  
Keyword(s):  
Layered Compound ◽  
Hydrothermal Crystallization ◽  
Wide Range ◽  
Facile Transformation ◽  
Crystallization Structure

Ln-Dependent crystallization, structure, and thermolysis were systematically studied for layered Ln2(OH)4SO4·nH2O compounds, and their transformation into oxysulfate and oxysulfide phosphors was demonstrated.

Determination of Experimental Conditions of Preparation of Zeolites from Fly Ashes via Alkaline Fusion Followed by Hydrothermal Crystallization

2014 ◽  
Vol 1061-1062 ◽  
pp. 342-350
Author(s):  
Yun Xia Chen ◽  
Cheng Wan ◽  
Xiao Li Su ◽  
Tao Zeng ◽  
Si Yang Rao
Keyword(s):  
Experimental Method ◽  
Hydrothermal Crystallization ◽  
Fly Ashes ◽  
Experimental Conditions ◽  
Crystalline Phases ◽  
Alkaline Fusion ◽  
Acid Solubility ◽  
Si Content ◽  
Two Stages ◽  
Optimized Conditions

In this study, we converted high silicon fly ashes (FA) to zeolites using a two stages conversion process: alkaline fusion followed by hydrothermal crystallization. The orthogonal experimental method was applied to design the experimental variables of alkaline fusing and hydrothermal crystallizing procedure. Alkaline fusion prior to hydrothermal synthesis was applied to collapse the FA crystalline phases and release Si content. Different from most of the research, the mixtures of NaOH and Na2CO3were used to increase the fusion temperature in order to remove the residue carbon simultaneously. Acid solubility was used to evaluate the efficiency of alkaline fusion. Then the optimized alkali-fused FA was resolved in the NaOH solutions and the experiment conditions were designed by the orthogonal experimental method. XRD and SEM were employed to characterize the crystalline phases and microimages of the raw FA and the treated FA. Adsorption process of methylene blue was applied to simulate the adsorption ability of the fly ash zeolites. Finally, the optimized conditions of alkaline fusion and hydrothermal treatment were concluded.

scholarly journals Facile and Low-Cost SPE Modification Towards Ultra-Sensitive Organophosphorus and Carbamate Pesticide Detection in Olive Oil

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4988
Author(s):  
Dionysios Soulis ◽  
Marianna Trigazi ◽  
George Tsekenis ◽  
Chrysoula Chandrinou ◽  
Apostolos Klinakis ◽  
...  
Keyword(s):  
Olive Oil ◽  
Limit Of Detection ◽  
Organophosphorus Pesticides ◽  
Low Cost ◽  
Linear Range ◽  
The Family ◽  
Forward Transfer ◽  
Optimized Conditions ◽  
Carbamate Pesticide

Despite the fact that a considerable amount of effort has been invested in the development of biosensors for the detection of pesticides, there is still a lack of a simple and low-cost platform that can reliably and sensitively detect their presence in real samples. Herein, an enzyme-based biosensor for the determination of both carbamate and organophosphorus pesticides is presented that is based on acetylcholinesterase (AChE) immobilized on commercially available screen-printed carbon electrodes (SPEs) modified with carbon black (CB), as a means to enhance their conductivity. Most interestingly, two different methodologies to deposit the enzyme onto the sensor surfaces were followed; strikingly different results were obtained depending on the family of pesticides under investigation. Furthermore, and towards the uniform application of the functionalization layer onto the SPEs’ surfaces, the laser induced forward transfer (LIFT) technique was employed in conjunction with CB functionalization, which allowed a considerable improvement of the sensor’s performance. Under the optimized conditions, the fabricated sensors can effectively detect carbofuran in a linear range from 1.1 × 10−9 to 2.3 × 10−8 mol/L, with a limit of detection equal to 0.6 × 10−9 mol/L and chlorpyrifos in a linear range from 0.7 × 10−9 up to 1.4 × 10−8 mol/L and a limit of detection 0.4 × 10−9 mol/L in buffer. The developed biosensor was also interrogated with olive oil samples, and was able to detect both pesticides at concentrations below 10 ppb, which is the maximum residue limit permitted by the European Food Safety Authority.

Hydrothermal Preparation and Sintering of Fine Ceramic Powders

1983 ◽  
Vol 24 ◽  
Author(s):  
Shigeyuki Sōmiya
Keyword(s):  
Hydrothermal Reaction ◽  
Metal Powders ◽  
Hydrothermal Crystallization ◽  
Ceramic Powders ◽  
Hydrothermal Conditions ◽  
Hydrothermal Preparation ◽  
Fine Ceramic ◽  
Fine Powders ◽  
Hydrothermal Oxidation ◽  
Hydrothermal Precipitation

ABSTRACTHydrothermal preparation is one of the methods to make fine ceramic powders. There are: (1) hydrothermal oxidation, (2) hydrothermal precipitation, (3) hydrothermal synthesis, (4) hydrothermal decomposition, (5) hydrothermal crystallization, etc. Starting materials for hydrothermal oxidation is mainly metal. Reaction between metal and high temperature-high pressure solution occurs to form oxide. Therefore, starting materials for very fine powders are: (1) metal powders or chips, (2) gel, solutions, etc., (3) oxides and solutions, (4) solids, and (5) hydrous material. This paper describes hydrothermal crystallization and oxidation. Fine powders of ZrO2, Al2O3, HfO2, and Al2O3-ZrO2 are described.Sintered bodies are also able to get under hydrothermal conditions with reactions. Hydrothermal reaction sintered bodies of iron oxides, Cr2O3, ZrO2 and HfO2 were obtained under 100 MPa above 1000°C with 1–5 μm grains.

Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

1988 ◽  
Vol 62 (03) ◽  
pp. 419-423 ◽  
Author(s):  
Baba Senowbari-Daryan ◽  
George D. Stanley
Keyword(s):  
Endemic Species ◽  
Upper Triassic ◽  
Island Arc ◽  
Tropical Island ◽  
The Family ◽  
Wallowa Terrane ◽  
Unique Condition ◽  
Hells Canyon

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges areAmblysiphonellacf.A. steinmanni(Haas), known from the Tethys region, andColospongia whalenin. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

Electron Microscopy of Mycoplasma Pneumoniae

1971 ◽  
Vol 29 ◽  
pp. 258-259 ◽  
Author(s):  
E. S. Boatman ◽  
G. E. Kenny
Keyword(s):  
Electron Microscopy ◽  
Light Microscopy ◽  
Growth Phase ◽  
Hela Cells ◽  
Sulfonic Acid ◽  
Gamma Globulin ◽  
Horse Serum ◽  
Morphological Aspects ◽  
The Family

Information concerning the morphology and replication of organism of the family Mycoplasmataceae remains, despite over 70 years of study, highly controversial. Due to their small size observations by light microscopy have not been rewarding. Furthermore, not only are these organisms extremely pleomorphic but their morphology also changes according to growth phase. This study deals with the morphological aspects of M. pneumoniae strain 3546 in relation to growth, interaction with HeLa cells and possible mechanisms of replication.The organisms were grown aerobically at 37°C in a soy peptone yeast dialysate medium supplemented with 12% gamma-globulin free horse serum. The medium was buffered at pH 7.3 with TES [N-tris (hyroxymethyl) methyl-2-aminoethane sulfonic acid] at 10mM concentration. The inoculum, an actively growing culture, was filtered through a 0.5 μm polycarbonate “nuclepore” filter to prevent transfer of all but the smallest aggregates. Growth was assessed at specific periods by colony counts and 800 ml samples of organisms were fixed in situ with 2.5% glutaraldehyde for 3 hrs. at 4°C. Washed cells for sectioning were post-fixed in 0.8% OSO4 in veronal-acetate buffer pH 6.1 for 1 hr. at 21°C. HeLa cells were infected with a filtered inoculum of M. pneumoniae and incubated for 9 days in Leighton tubes with coverslips. The cells were then removed and processed for electron microscopy.

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