Relevant bibliographies by topics / Amorphous Aluminum Fluoride

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  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Amorphous Aluminum Fluoride'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Amorphous Aluminum Fluoride"

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Krahl, Thoralf, and Erhard Kemnitz. "Amorphous Aluminum Bromide Fluoride (ABF)." Angewandte Chemie International Edition 43, no. 48 (December 10, 2004): 6653–56. http://dx.doi.org/10.1002/anie.200460491.

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Kazanski, Barbara, Alexei Kossenko, Alex Lugovskoy, and Michael Zinigrad. "Fluoride Influence on the Properties of Oxide Layer Produced by Plasma Electrolytic Oxidation." Defect and Diffusion Forum 326-328 (April 2012): 498–503. http://dx.doi.org/10.4028/www.scientific.net/ddf.326-328.498.

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Plasma Electrolytic Oxidation (PEO) is a powerful technique allowing hardening and corrosion protection of valve metals due to formation of an oxide layer on the metal surface. The addition of fluoride ions to the alkaline electrolyte for the PEO processing of aluminum and magnesium alloys produces significant changes in the structure and properties of the coating [1-, however the mechanism of these changes is not clear. A study of the influence of the fluoride concentration on the composition, structure and morphology of thin (to 20 µm) PEO layers was performed. The oxide layer thickness on aluminum is significantly smaller than that on magnesium. Fluorine is detected as an amorphous phase in the vicinity of the base metal.
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3

LaZerte, Bruce D., and Joe Findeis. "The relative importance of oxalate and pyrophosphate extractable aluminum to the acidic leaching of aluminium in Podzol B horizons from the Precambrian Shield, Ontario, Canada." Canadian Journal of Soil Science 75, no. 1 (February 1, 1995): 43–54. http://dx.doi.org/10.4141/cjss95-007.

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Four Bf and one Bhf Podzol horizon samples from the Precambrian Shield, Ontario, Canada were leached with pH 3 solutions in three different experiments to determine which soil aluminum fraction was primarily responsible for the aluminum leached into solution. For the Bf horizons, it was primarily the oxalate-extractable aluminum fraction (corrected for pyrophosphate, Alo–Alp); for the Bhf horizon it was equally the pyrophosphate (Alp) and Alo–Alp. A comparison with other studies suggests that when the ratio (Alo–Alp)/Alp is above 0.3–0.7, the oxalate-extractable fraction will be most important, and at lower ratios the pyrophosphate fraction becomes most important. The pattern of fluoride leaching in these experiments suggests that F was concentrated primarily on the surface of the amorphous aluminum fraction. Key words: Aluminum, silica, fluoride, Podzol, acid deposition
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Farrah, H., J. Slavek, and WF Pickering. "Fluoride interactions with hydrous aluminum oxides and alumina." Soil Research 25, no. 1 (1987): 55. http://dx.doi.org/10.1071/sr9870055.

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Fluoride ion interaction with amorphous Al(OH),, gibbsite or alumina (Al2O3) has been investigated over a range of pH values (3-8) and F- concentrations (0.1-1 mM) . At pH <6 and total F- : Al ratios >2.5, most of the amorphous AI(OH)3 gel dissolved through formation of AlF, complexes, with the distribution of fluoro ions being determined by the equilibrium F- value. At lower F : Al ratios, some solid persisted in the pH 4-7 region and strongly sorbed F- from solution. Maximum uptake occurred in the pH 5.5-6.5 region (up to 9 mol kg-1). At lower pH, uptake declined due to preferential formation of AlFx soluble species; at higher pH, OH- displaced F- from the solid and the amount of F- sorbed or converted to complexes declined rapidly towards zero between pH 6 and 8. Similar pH trends were observed using � Al2O3, except that both substrate solubility and the adsorptive capacity was less. At a iixed pH (between 5 and 7.5) uptake varied in accordance with a Langmuir equation (maximum capacity approx. 1 mol kg-1). The amount of substrate converted into AlFx complexes in acid media increased with decreasing pH and increasing initial fluoride concentration. Gibbsite displayed the same dissolution trends, but reacted at a much slower rate. Little F was sorbed by this substrate (10-20 mmol kg-1). The study has confirmed the ability of F- to mobilize A1 and the capacity of Al(OH)3 to scavenge F- from aqueous phases in the pH 4-7 region.
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Gupta, Agman, Chelli Sai Manohar, and Belliraj Siva Kumar. "Optimization of cation-doped nano-hydroxyapatite in combination with amorphous aluminum hydroxide for defluoridation." Water Supply 19, no. 6 (March 5, 2019): 1686–94. http://dx.doi.org/10.2166/ws.2019.041.

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Abstract Given widespread fluoride in the ground water, there is a need for effective defluoridation in several geographical areas. In this regard, we explored heavily doped cationic nano-composites of hydroxyapatite (HA) given its surface chemistry for adsorption of the specific anion. We synthesized and extensively characterized HA nano-rods (HA-NR), Al/Mg-HA nanocomposites and amorphous aluminum hydroxide, and optimized their efficient defluoridation. The kinetics and thermodynamics of adsorption were further evaluated to establish the mechanistic rationale and its spontaneity. We report the optimized ideal adsorbents for the near-total removal of fluoride that demonstrated 99.99% and 99.98% efficiency with adsorption capacities of 83.3 and 81.3mg/g respectively. The adsorbent composites were (Mg-HA)-Al(OH)3 and (HA-NR)-Al(OH)3 in 1:1 ratio. The optimal conditions for defluoridation were 25mg of adsorbent in 25ml (10mg/L) fluoride solution at room temperature agitated for 10h in the pH range of 4.88–7.20.
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Zhang, Yong-Xing, and Yong Jia. "Fluoride adsorption onto amorphous aluminum hydroxide: Roles of the surface acetate anions." Journal of Colloid and Interface Science 483 (December 2016): 295–306. http://dx.doi.org/10.1016/j.jcis.2016.08.054.

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7

Kang, Dongjuan, Shengrui Tong, Xiaolin Yu, and Maofa Ge. "Template-free synthesis of 3D hierarchical amorphous aluminum oxide microspheres with broccoli-like structure and their application in fluoride removal." RSC Advances 5, no. 25 (2015): 19159–65. http://dx.doi.org/10.1039/c4ra13688h.

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8

Mamchenkov, Evgeniy A., and Valery Yu Prokof’ev. "SODIUM SILICATE MANUFACTURING FROM MODIFIED SILICA GEL AS BY-PRODUCT OF ALUMINUM FLUORIDE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 3 (February 21, 2019): 89–93. http://dx.doi.org/10.6060/ivkkt.20196203.5949.

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The article considers the waste-free production of sodium silicate from modified silica gel. The proposed method corresponds the principles of green chemistry. Synthesis is carried out from industrial raw materials at atmospheric pressure without the formation of unrecyclable by-products. Silica gel is an amorphous silica with impurities of aluminum fluoride and fluorosilicic acid, which is obtained as a by-product of aluminum fluoride production from Cherepovets "Phosagro". The goal of this study is to investigate the possibilities of using modified silica gel, for manufacture of sodium silicate with minimum waste production. Studies show, that sodium hydroxide can be used for chemical modification of the surface of silica gel at 20 °C. Optimal alkali concentration and time of silica modification was determined. Alkaline solution with concentration 25% or more could be used multiple times in a process of silica modification. The following variables in this work had been analyzed: time of reaction (varying of 0 to 90 min), molar ratio SiO2/NaOH (1, 2, 3), mass ratio H2O/SiO2 (1; 2.5; 5) and reaction temperature (60, 80, 95, and 105 °C). It is observed that the SiO2/NaOH ratio reaching 2.8 at 95 °C, in 12-15 min of reaction. In the process of dissolving the modified microsilica, it was possible to achieve a transition to soluble sodium silicate about 92% of silicon dioxide.
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Yassaei, Sogra, Hossein Aghili, Neda Shahraki, and Isa Safari. "Efficacy of erbium-doped yttrium aluminum garnet laser with casein phosphopeptide amorphous calcium phosphate with and without fluoride for remineralization of white spot lesions around orthodontic brackets." European Journal of Dentistry 12, no. 02 (April 2018): 210–16. http://dx.doi.org/10.4103/ejd.ejd_265_17.

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ABSTRACT Objective: This study aimed to assess the efficacy of erbium-doped yttrium aluminum garnet (Er:YAG) laser, pastes containing casein phosphopeptide amorphous calcium phosphate (CPP-ACP) with and without fluoride and their combination for prevention of white spot lesions in the enamel. Materials and Methods: This in vitro experimental study was conducted on 90 extracted sound premolars. The teeth were then randomly divided into six groups of 15: (1) Control, (2) laser, (3) CPP-ACP with fluoride (GC MI Paste, RecaldentTM 900 ppm as NaF), (4) CPP-ACP without fluoride (GC Tooth Mousse RecaldentTM), (5) laser + CPP-ACP with fluoride, and (6) laser + CPP-ACP without fluoride. In each group, enamel surface was exposed to the remineralizing agent. The teeth were then subjected to pH cycling for 14 days. The teeth were then sectioned, polished, and underwent cross-sectional microhardness testing at 20–160 μ depth quantitatively. Using the Simpson's rule, the amount of mineral loss was calculated in each group. Statistical Analysis Used: ANOVA was used for the comparisons, and Tukey's test was applied for pairwise comparisons. Results: The highest mean volume percentage of microhardness at 20–60 μ depth belonged to the group laser + CPP-ACP with fluoride and the lowest belonged to the control group (P = 0.001). The differences were not significant at 80-120 μ depth (P > 0.05). These finding are confirmed according to △Z (mineral loss). Conclusion: Based on these results, Er: YAG laser was able to decrease demineralization and was a potential alternative to preventive dentistry and was more effective when combined with CPP-ACP products.
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Chen, G. S., P. Y. Lee, C. B. Boothroyd, and C. J. Humphreys. "Crystallization transformations in vacuum-deposited amorphous aluminum fluoride self-developing thin-film resists induced by electron-beam irradiation." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 20, no. 3 (May 2002): 986–90. http://dx.doi.org/10.1116/1.1464842.

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Dissertations / Theses on the topic "Amorphous Aluminum Fluoride"

1

Krahl, Thoralf. "Amorphes Aluminiumchlorofluorid und -bromofluorid - die stärksten bekannten festen Lewis-Säuren." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2005. http://dx.doi.org/10.18452/15384.

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Die feste nichtkristalline Lewis-Säure Aluminiumchlorofluorid (ACF, AlCl(x)F(3-x), x = 0.05 .. 0.3) hat die höchste bisher bekannte Lewis-Acidität aller heterogenen Katalysatoren. Sie erreicht die Stärke von Antimonpentafluorid SbF5 und übertrifft sie in manchen Fällen sogar. In dieser Arbeit wurden die Bulk-Struktur des ACF und der sehr ähnlichen Verbindung Aluminiumbromofluorid (ABF) mittels IR-, ESR-, NMR- und Röntgenabsorptionsspektroskopie studiert. Die Oberfläche der Verbindungen wurde durch die Adsorption von Gasen bei niedrigen Temperaturen untersucht, sowie durch IR- und ESR-Spektroskopie adsorbierter Sondenmoleküle. Das thermische Verhalten dieser nichtkristallinen Verbindungen wurde mittels DTA verfolgt. Die Lewis-Acidität kleiner Modellverbindungen wurde NMR-spektroskopisch und mit ab initio Methoden untersucht. Alle Daten wurden mit denen der gut charakterisierten und bekannten Modifikationen des Aluminiumfluorids (AlF3) verglichen. Die kombinierten Ergebnisse der Messungen an beiden festen Phasen erlauben die Entwicklung eines Strukturmodells für diese Verbindungen, das die meisten spektroskopischen Daten und die außergewöhnlich hohe Lewis-Acidität erklären kann. Beide Phasen sind sehr ähnlich zueinander. Das Vorhandensein des schwereren Halogens (Cl, Br) erzeugt eine Störung des Netzwerkes und verhindert die Ausbildung geordneter Strukturen. Der Grad der Unordnung in diesen Phasen ist höher als bei allen anderen Verbindungen des Aluminiumfluorids. Daraus resultiert eine gestörte Oberfläche, was wiederum zu koordinativ ungesättigtem Aluminium an der Oberfläche führt. Die sauren Zentren in ACF und ABF sind stärker als in anderen aluminiumhaltigen Lewis-Säuren.
The solid non-crystalline Lewis acid aluminum chlorofluoride (ACF, AlCl(x)F(3-x), x = 0.05 .. 0.3) has the highest Lewis acidity of any heterogeneous catalyst known so far. It reaches the acidity of antimony pentafluoride (SbF5) and in some cases even exceeds it. In this work the bulk structure of ACF and of the very similar compound aluminium bromofluoride (ABF) was studied by IR, ESR, NMR, and X-ray absorption spectroscopy. The surface of the compounds was investigated by adsorption of gases at low temperatures, as well as by IR and ESR spectroscopy of adsorbed probe molecules. The thermal behavior of these non-crystalline compounds was followed by DTA. The Lewis acidity of small model compounds was studied by NMR spectroscopy and ab initio calculations. All data were compared to those of well characterized known samples of the different modifications of aluminum fluoride (AlF3). The combined results of the measurements of both solid phases allow to set up a structure model for these compounds which can explain most of the spectrocopic data and the extraordinary high Lewis acidity. Both phases are very similar to each other. The occurrence of the heavier halogen (Cl, Br) causes a perturbation of the network and prevents it from forming ordered structures. The degree of disorder of these phases is higher than for any other known compounds of aluminum fluoride. This results in an disordered surface which leads to coordinatively unsaturated aluminum at the surface. The acidic centers of ACF and ABF are stronger than in any other aluminum containing Lewis acid.
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Magnfält, Daniel. "Alternative method for deposition of alumina thin films." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16706.

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Deposition of alumina thin films in the presence of fluorine as a method for reducing thehydrogen incorporation in the films was investigated in this thesis. Hydrogen incorporated in alumina thin films have been shown to cause a lower density and refractive index in amorphous films, assist electrical conduction through thin amorphous films as well as inhibiting the formation of the thermally stable α-phase. The depositions were made in a ultra high vacuum system where high vacuum conditions were simulated by leaking water vapor into the system. No substrate heating or substratebias was applied. Films were deposited at a range of fluorine partial pressures, from 2,5×10-6- 5×10-5 Torr, and were analyzed by elastic recoil detection analysis, nuclear reaction analysis, scanning electron microscopy and x-ray diffraction. Mass spectrometry measurements were done during the depositions to analyze the deposition process. The mass spectrometry investigations show that there is a trend of increasing O2 partial pressures with increasing fluorine partial pressures during the depositions. This is attributed to the well known reaction: 2H2O+F2→O2+4HF. However, no trend in the measured water partial pressures can be observed. The increase in the O2 partial pressure is therefore attributed to a reaction between water and fluorine on the chamber walls. The chemical analysis show that the hydrogen incorporation in the films were lowered from ~10 at.% when deposited in the presence of water vapor to ~3 at.% when deposited in the presence of water vapor and 2×10-5 Torr fluorine. The hydrogen incorporation stabilize at ~3 at.% at higher fluorine partial pressures. However, there is also a large amount of fluorine incorporated in the films, ~20 at.% with a fluorine partial pressure during the deposition of 2×10-5 Torr and ~46 at.% with a fluorine partial pressure of 5×10-5 Torr. There is a slight increase in the aluminum concentration in the films deposited with fluorine. This is attributed to bonding the hydrogen in aluminum hydroxide while the reminder forms Al2O3 or Al leading to an increase in the aluminum concentration in the film. A linear decrease in the deposition rate with increasing fluorinepartial pressures during the deposition was observed, this can be explained by sputter etching of AlFx and AlOxFy by energetic O- ions. The XRD investigation show that the films deposited with the highest fluorine partial pressures were x-ray amorphous, the films with deposited with lower fluorine partial pressures are therefore also assumed to be amorphous.
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Conference papers on the topic "Amorphous Aluminum Fluoride"

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Luo, Jian-Shing, Hui-Min Lo, and Jeremy D. Russell. "The Microstructure Evolution of Corrosion Phenomenon on Aluminum Bond Pads." In ISTFA 2005. ASM International, 2005. http://dx.doi.org/10.31399/asm.cp.istfa2005p0266.

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Abstract X-ray photoelectron spectroscopy (XPS) is a very popular tool for identification of the chemical state of fluorine contamination on aluminum (Al) bond pads. To date, as far as the authors are aware the detailed microstructures of fluorine corrosion on bond pads have not been reported. This paper reports the microstructure evolution of fluorine corrosion on bond pads in a plastic box under specific environment conditions by using transmission electron microscopy (TEM), optical microscopy, focused ion beam and scanning electron microscopy (SEM). The elemental distributions and chemical bonding were performed by using Gatan Image Filter/TEM, energy dispersive X-ray/Scanning TEM (STEM), Auger electron spectroscopy and XPS, respectively. On Al pads with 35 atomic %, fluorine residual, corrosion was observed after around 10 days of storage and became more severe with time. The corrosion layers consist of nano-crystalline and amorphous for both single and double-layer structures.
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