Artykuły w czasopismach: „Aluminium Oxide Phosphate”

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Coletti-Previero, M.-A., M. Pugnière, H. Mattras, J. C. Nicolas i A. Previero. "Selective retention of organic phosphate esters and phosphonates on aluminium oxide". Bioscience Reports 6, nr 5 (1.05.1986): 477–83. http://dx.doi.org/10.1007/bf01116139.

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Compounds containing the −PO3H2 function, such as monoesters of phosphoric acid and phosphonic acids, specifically bind to aluminium oxide in aqueous solution under experimental conditions where non-phosphorylated compounds are completely desorbed. The bound organic phosphate can be specifically displaced by aqueous solution of inorganic phosphates thus allowing their separation or detection by a technique similar to that of affinity chromatography. The consequences of this finding for phosphate compound biochemistry are discussed.

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Xie, Weimin, Qunhui Wang, Hongzhi Ma i Hiroaki Ogawa. "Phosphate removal from wastewater using aluminium oxide as adsorbent". International Journal of Environment and Pollution 23, nr 4 (2005): 486. http://dx.doi.org/10.1504/ijep.2005.007611.

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Prijambada, Irfan Dwidya, Jaka Widada, Siti Kabirun i Donny Widianto. "Secretion of Organic Acids by Phosphate Solubilizing Bacteria". JOURNAL OF TROPICAL SOILS 14, nr 3 (1.09.2009): 245. http://dx.doi.org/10.5400/jts.2009.v14i3.245-251.

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Phosphorus availability is a major limiting for crop production. Bacterial solubilization of insoluble inorganic phosphate has been studied as a means of providing available phosphorus for crop production. Bacterial abilities to solubilize calcium phosphate and rock phosphate have been identified to be related with their abilities to produce gluconic acid and ketogluconic acid. However, there is no information regarding the relationship between bacterial ability to solubilize aluminum phosphate and their ability to produce organic acids. This study was conducted to investigate the relationship between bacterial ability to solubilize calcium and aluminum phosphates with their ability to produce organic acids. Bacterial ability to solubilize calcium and aluminum phosphates were determined as the concentration of soluble phosphate in the filtrate of bacterial cultivation media, while bacterial ability to produce organic acids were assessed from the accumulated organic acids in its. The results showed that bacterial abilities to solubilize calcium and aluminum phosphates well related to their abilities to produce organic acids. Organic acids related with the solubilization of calcium phosphate differ from the ones relatedAlam, S., S. Khalil, N. Ayub, and M. Rashid. 2002. In vitro solubilization of inorganic phosphate by phosphate solubilizing microorganisms (PSM) from maize rhizosphere. Int. J. Agri. Biol. 4: 454-458.Beauchemin, S., D. Hesterberg, J. Chou, M. Beauchemin, R.R. Simard, and D.E. Sayers. 2003. Speciation of phosphorus in phosphorus-enriched agricultural soils using X-ray absorption near-edge structure spectroscopy and chemical fractionation. J. Environ. Qual. 32:1809–1819.Bolan, N.S., R. Naidu, S. Mahimairaja, dan S. Baskaran. 1994. Influence of low-molecular-weight organic acids on the solubilization of phosphates. Biol. Fertil. Soils 18: 311-319.Cline, G.R., P.E. Powell, P.J. Szaniszlo, dan C.P. Reid. 1983. Comparison of the abilities of hydroxamic and other natural organic acids to chelate iron and other ions in soil. Soil Sci. 136: 145-157.Curtin, D., and J.K. Syers, 2001. Lime-induced changes in indices of soil phosphate availability. Soil Sci. Soc. Am. J. 65:147–152.Fox, T.R., N.B. Comerford, dan W.W. McFee. 1990. Phosphorus and aluminium release from a spodic Horizon mediated by organic acids. Soil Sci. Soc. Am. J. 54: 1763-1767.Hue, N.V., G.R. Craddock, dan F. Adams. 1986. Effect of organic acids on aluminium toxicity in subsoils. Soil Sci. Soc. Am. J. 50: 28-34.Johnson, S.E., and R.H. Loeppert. 2006. Role of organic acids in phosphate mobilization from iron oxide. Soil Sci. Soc. Am. J. 70:222–234.Kumari, A., K.K. Kapoor, B.S. Kundu, and R.K. Mehta. 2008. Identification of organic acids produced during rice straw decomposition and their role in rock phosphate solubilization. Plant Soil Environ. 54: 72–77Lopez-Hernandez, D., D. Flores, G. Siegert, dan J.V. Rodriguez. 1979. The effect of some organic anions on phosphate removal from acid and calcareous soils. Soil Sci. 128: 321-326.Lopez-Pineiro, A., dan A. Garcia-Navarro. 2001. Phosphate fractions and availability in Vertisols of South-Western Spain. Soil Sci. 166: 548-556.Olsen, S.R. dan Sommers, L.E. 1982. Phosphorus. In Page, A.L., Miller, R.H. & Keeney, D.R. (eds.). Methods of Soil Analysis. Part 2. 2nd ed. ASA and SSSA Publisher, Madison.Rao, W.V.B.S., and M.K. Sinha. 1963. Phosphate dissolving microorganisms in the soil and rhizosphere. Indian J. agric. Sci. 33: 272-278.Rodriguez, H., T. Gonzalez, I. Goire, dan Y. Bashan. 2004. Gluconic acid production and phosphate solubilization by the plant growth-promoting bacterium Azospirillum spp. Naturwissenschaften 91: 552-555.Sagoe, C.I., T. Ando, K. Kouno, and T. Nagaoka. 1997. Effect of organic-acid treatment of phosphate rocks on the phosphorus availability to Italian ryegrass. Soil Sci. Plant Nutr. 43: 1067-1072.Sanchez, P.A. 1976. Properties and Management of Soils in the Tropics. John Wiley & Sons, Inc. New York. 618 pp.Siddique, M.T., and J.S. Robinson. 2003. Phosphorus sorption and availability in soils amended with animal manures and sewage sludge. J. Environ. Qual. 32:1114–1121.Song, O.R., S.J. Lee, Y.S. Lee, S.C. Lee, K.K. Kim, dan Y.L. Choi. 2008. Solubilization of insoluble inorganic phosphate by Burkholderia cepacia DA23 isolated from cultivated soil. Braz. J. Microbiol. 39: 151-156.Sridevi, M., K.V. Mallaiah, and N.C.S. Yadav. 2007. Phosphate solubilization by Rhizobium isolates from Crotalaria species. J. Plant Sci. 2: 635-639.Traina, S.J., G. Sposito, D. Hesterberg, dan U. Kafkafi. 1986. Effects of pH and organic acids on orthophosphate solubility in an acidic, montmorillonitic soil. Soil Sci. Am. J. 50: 45-52.Trivedi, P., and T. Sa. 2008. Pseudomonas corrugata (NRRL B-30409) mutants increased phosphate solubilization, organic acid production, and plant growth at lower temperatures. Curr. Microbiol. 56: 140-144.Tunesi, S., V. Poggi, and C. Gessa. 1999. Phosphate adsorption and precipitation in calcareous soils: The role of calcium ions in solution and carbonate minerals. Nutr. Cycling Agroecosyst. 53:219–227.Zhang, M., A.K. Alva, Y.C. Li, dan D.V. Calvert. 2001. Aluminium and iron fractions affecting phosphorus solubility and reactions in selected sandy soils. Soil Sci. 166: 940-948.with the solubilization of aluminum phosphate. Moreover, there is similarity in the production of organic acids related to the solubilization of aluminum phosphates and iron phosphate.

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Chanthima, Natthakridta, Yaowaluk Tariwong, Hong Joo Kim, Jakrapong Kaewkhao i Narong Sangwaranatee. "Effect of Eu³⁺ Ions on the Physical, Optical and Luminescence Properties of Aluminium Phosphate Glasses". Key Engineering Materials 766 (kwiecień 2018): 122–26. http://dx.doi.org/10.4028/www.scientific.net/kem.766.122.

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The physical, optical and luminescence properties of lithium aluminium phosphate glasses different doping europium oxide have been investigated to evaluate their properties for solid-state lighting applications. The density and molar volume measurements were carried out at room temperature. The absorption spectra were investigated in the UV-Vis-NIR region from 250 to 2500 nm. The emission spectra, excited with 394 nm excitation wavelength showed four emission transitions corresponding to 5D0→7F1 (591 nm), 5D0→7F2 (612 nm), 5D0→7F3 (648 nm) and 5D0→7F4 (698 nm). The optimal concentration of Eu2O3 in lithium aluminium phosphate glasses was 1.00 mol%.

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Vippola, M., J. Vuorinen, P. Vuoristo, T. Lepistö i T. Mäntylä. "Thermal analysis of plasma sprayed oxide coatings sealed with aluminium phosphate". Journal of the European Ceramic Society 22, nr 12 (listopad 2002): 1937–46. http://dx.doi.org/10.1016/s0955-2219(01)00522-2.

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Birch, W. D., i A. Pring. "Sieleckiite, a New Copper Aluminium Phosphate from Mt Oxide, Queensland, Australia". Mineralogical Magazine 52, nr 367 (wrzesień 1988): 515–18. http://dx.doi.org/10.1180/minmag.1988.052.367.11.

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AbstractSieleckiite is a new copper aluminium phosphate discovered at the Mt Oxide Copper Mine, 150 km north of Mt Isa, Queensland, Australia. It occurs with variscite, turquoise, libethenite and minor pseudomalachite in a fracture in a boulder of quartzite and shale. Sieleckiite forms deep sky blue to royal blue spheres up to 0.5 mm in diameter, made up of fibrous radiating crystals between 20 and 100 µm long and 1 to 2 µm wide. The mineral has a very pale blue streak and a pearly lustre on uneven fracture surfaces. Hardness is about 3 and the measured density is 3.02 g cm−3. The average of nine electron microprobe analyses gave CuO 32.39, Al2O3 26.57, P2O5 19.42%. Separate analyses gave H2O 18.1, CO2 1.6% (carbonate impurity). These data gave an empirical formula of Cu3.1Al4.0(PO4)2.1(OH)12.1.7H2O, calculated on the basis of 22 oxygen atoms. The simplified formula is Cu3Al4.0(PO4)2.1(OH)12.2H2O. The strongest lines in the X-ray powder diffraction pattern are {d(I)(hkl)}; 9.12(50)(100), 5.06(100)(101), 3.852(100)(111), 3.276(30)(2¯20), 2.827(50)(1¯02,102), 2.460(50)(3¯21). These data were indexed on a triclinic cell with a 9.41(8), b 7.56(5), c 5.95(6) Å, α 90.25(12)° β 91.27(12)° γ 104.02(7)° and a volume of 410.8(5) Å3. For Z = 1, the calculated density is 2.94 g cm−3. Optical properties could not be determined in full; the refractive indices are between 1.63 and 1.66, pleochroism is very weak from colourless to very pale blue.The mineral is named for the discoverer, Robert Sielecki (1958- ). Type specimens are preserved at the Museum of Victoria and the South Australian Museum. Sieleckiite was approved by the IMA Commission on New Minerals and Mineral Names prior to publication.

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Borges, I., J. P. Wignacourt, J. C. Boivin, A. Nonat, A. Lorriaux-Rubbens, F. Wallart i J. M. Canini. "The Magnesium Oxide- Mono Aluminium Phosphate Reaction: Mechanism and Concentration Dependence". Advanced Materials Research 1-2 (wrzesień 1994): 609–20. http://dx.doi.org/10.4028/www.scientific.net/amr.1-2.609.

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Ibrahim, Ali M., Y. H. Elbashar, A. M. Badr, H. A. Elshaikh i A. G. Mostafa. "Mixed ionic–polaronic conduction in copper sodium phosphate glasses containing aluminium oxide". Journal of Microwave Power and Electromagnetic Energy 51, nr 1 (2.01.2017): 71–89. http://dx.doi.org/10.1080/08327823.2017.1291069.

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Luchese, Eduardo Bernardi, Ervim Lenzi, Luzia Otília Bortotti Favero i Luceide Heloisa Loubak. "Phosphorus collectors from filter paper and synthetic cloth coated with iron or aluminium oxide to provide phosphorus by diffusion in soils". Brazilian Archives of Biology and Technology 43, nr 2 (2000): 173–79. http://dx.doi.org/10.1590/s1516-89132000000200006.

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Phosphorus collectors made from filter paper and synthetic cloth, were tested to evaluate their feasibility of determining the need for phosphate application. The collectors were coated with two types of oxides, iron oxide and aluminium oxide. The capacity of the collectors was tested by placing them in a 2 mL of solution containing phosphorus (PO4(3-)) in the concentration of 0.0, 1.00, 3.00, 5.00, 7.00, 9.00 and 11.00 µ g.mL-1, respectively, after which they were placed in contact with four types of soil (LBa, LRd, LEd and Ca) and incubed for 0.0 and 24 h. In this test the soils were kept at a humidity equivalent to 150 mmHg suction. The amount of phosphorus extracted from the solutions was tested at intervals between 0,0 and 11.0 µ g of phosphorus/mL. Results indicated that collectors were most efficient in Dystrophic Dark-Red Latosol (LEd) and less efficient in "Bruno álico" Latosol (LBa) and Cambisol (Ca). Synthetic cloth was the support yielding the best performance, whereas iron oxide lining was the most adequate lining material. Phosphorus collection increased with time of incubation.

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Araoyinbo, Alaba O., Mohd Nazree Derman, Azmi Rahmat i Khairel Rafezi Ahmad. "Electrochemical Measurement of PBS Using Cyclic Voltammetry and AAO Fabricated at Ambient Temperature and Low Potential". Advanced Materials Research 795 (wrzesień 2013): 654–57. http://dx.doi.org/10.4028/www.scientific.net/amr.795.654.

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Anodic aluminium oxide fabricated at ambient temperature and low potential in phosphoric acid electrolyte was used as the working electrode for the electrochemical measurement of phosphate buffer saline under different pH conditions using the cyclic voltammetry tool. We investigate the reversibility of the electrochemical reaction as a redox reaction from the cyclic graphs that were obtained. We observed that the ratio of the peak current passed at both the reduction and oxidation when measured was very close to unity in all the pH but except one which produced a none reversible reaction with a non cyclic graph. The peak potential for both reduction and oxidation reactions using phosphate buffer saline as the analyte under different pH of 3, 5, 7, and 9 was also obtained.

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Kim, Y., i R. J. Kirkpatrick. "An investigation of phosphate adsorbed on aluminium oxyhydroxide and oxide phases by nuclear magnetic resonance". European Journal of Soil Science 55, nr 2 (12.01.2004): 243–51. http://dx.doi.org/10.1046/j.1365-2389.2004.00595.x.

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Kobayashi, K., K. Shimizu i D. Teranishi. "Crystalline barrier oxide films formed on aluminium in an aqueous solution of ammonium dihydrogen phosphate". Journal of Materials Science Letters 5, nr 5 (maj 1986): 543–44. http://dx.doi.org/10.1007/bf01728685.

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Steiner Petrovič, Darja, i Djordje Mandrino. "Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging". Materials 14, nr 21 (28.10.2021): 6458. http://dx.doi.org/10.3390/ma14216458.

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The surface stoichiometry of the degraded surface of a commercial Al–Si casting was investigated. The die-cast component was previously stored in a sealed plastic envelope. After that, surface stains in the form of white layers were observed. X-ray photoelectron spectroscopy (XPS) was used to study these layers. For comparison, a seemingly unaffected area as well as a freshly cut surface of the casting were also analysed. In order to additionally assess the surface condition, surface roughnesses were measured. Based on the binding energies (BEs) of the Al and O in the XPS spectra, and the stoichiometric results, it was concluded that the surface layers of the degraded and undegraded samples consist mostly of aluminium oxide and aluminium hydroxide. Furthermore, sodium phosphate from the leftover detergent and silicon oxide were detected in both analysed areas. Analyses of the Al KLL Auger transition were used to corroborate this. The relative shares of Al oxide vs. hydroxide based on the elemental concentrations were determined. The chemical compositions and chemical states of the elements in the top layers were thus obtained. The combination of surface-sensitive analytical techniques was found to be a suitable tool for the ex-post identification of the source of defects.

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Radun, V., R. P. von Metzen, T. Stieglitz, V. Bucher i A. Stett. "Evaluation of adhesion promoters for Parylene C on gold metallization". Current Directions in Biomedical Engineering 1, nr 1 (1.09.2015): 493–97. http://dx.doi.org/10.1515/cdbme-2015-0118.

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AbstractDelamination of thin film polymeric coatings from metallization layers is a common cause of failure in biomedical implants. To address the problem, different adhesion promotion techniques can be applied which include surface pre-treatment with oxygen and argon plasma and the use of different adhesion promoters. In this paper the applicability of titanium (Ti), silicon oxide (SiOx), diamond-like carbon (DLC), tetramethylsilane (TMS) and aluminium oxide (AlOx) as adhesion promoters is evaluated. A cross cut, peel and scratch test are used to qualify and quantify the adhesion before and after storage in phosphate buffered saline (PBS) for 48 hours at a temperature of 37 °C. Promising results could be achieved by a combination of Ti and DLC as well as by AlOx.

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Ullah, Sami, Faiz Ahmad i Anildav Singh. "Development and Testing of Intumescent Fire Retardant Coating on Various Structural Geometries". Applied Mechanics and Materials 699 (listopad 2014): 360–65. http://dx.doi.org/10.4028/www.scientific.net/amm.699.360.

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Materials are prone to fire and in modern construction their protection from fire is required. In any structure, various joints such as T-joint, I-beam and elbows are used. The geometry of the component has significant role in protection of structure. A weak joint may lead to failure of main structure. In order to meet these challenges, Intumescent fire retardant coating (IFRC) were developed and tested on various structural geometries such as T-joints, elbows, I-beams and pipe. The control coating formulation (IFC-C) was developed from main ingredients; Ammonium Polyphosphate (APP), expandable Graphite (EG), Melamine (Mel), Boric Acid (BA) mixed with bisphenol A epoxy resin and polyamide hardener. Another set of formulations containing various percentage of aluminium Tri-Hydrate (ATH). Fire test results of ATH based formulation showed that I-beam geometry showed the high expansion of 19 mm. T-joint showed the average surface temperature of 55°C after one hour of Bunsen burner test. The X-ray Diffraction (XRD) showed the presence of boron oxide, boron phosphate, sassolite and aluminium oxide in IFC-ATH5 residual char. The 5wt% ATH filler in IFC-C enhanced the fire protection performance of intumescent fire retardant coating formulation.

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Sangwaranatee, N., N. Chanthima, Y. Tariwong i J. Kaewkhao. "Effect of alkali oxide on optical and luminescence properties of Sm 3+ doped aluminium phosphate glasses". Materials Today: Proceedings 5, nr 6 (2018): 13891–95. http://dx.doi.org/10.1016/j.matpr.2018.02.035.

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Ahmaniemi, S., M. Vippola, P. Vuoristo, T. Mäntylä, M. Buchmann i R. Gadow. "Residual stresses in aluminium phosphate sealed plasma sprayed oxide coatings and their effect on abrasive wear". Wear 252, nr 7-8 (kwiecień 2002): 614–23. http://dx.doi.org/10.1016/s0043-1648(02)00020-0.

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Andreeva, R., i D. Stoychev. "Phosphate sealing improvement of the corrosion resistance of thin cerium oxides coatings electroless deposited on aluminium". Journal of Physics: Conference Series 2240, nr 1 (1.03.2022): 012001. http://dx.doi.org/10.1088/1742-6596/2240/1/012001.

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Abstract The corrosion-protective ability was investigated of electroless deposited ceria conversion coatings on substrate(s) of technically pure aluminium. By applying different electrochemical methods, a comparative study of the investigated samples was conducted regarding the effect of pre-treatment of the Al substrate and the type of phosphate post-treatment on the change of: E OCP values, monitored EOCP vs. time plot; course of i a transients at the Epit of Al, i.e., ia vs. time plot; Rp vs. time of exposure of the samples in a corrosion medium and connected with this change in the CR of the systems studied. The juxtaposition of the obtained results showed the order of stabilities of the investigated systems towards the appearance and development of pitting corrosion. The presented results can be connected with and explain the data obtained earlier about the calculated stoichiometry of the elements in the so-formed compounds in the surface layers ascertaining that they are built of phosphate and oxide compounds of Ce3+, Ce4+ and Al3+, as well as with the influence of the concentrations of Cu and Fe around them.

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Abu Zeid, Sawsan T., Najlaa M. Alamoudi, Monazah G. Khafagi i Ensanya A. Abou Neel. "Chemistry and Bioactivity of NeoMTA Plus™ versus MTA Angelus® Root Repair Materials". Journal of Spectroscopy 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/8736428.

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Objectives. To analyse the chemistry and bioactivity of NeoMTA Plus in comparison with the conventional root repair materials. Method and Materials. Unhydrated and hydrated (initial and final sets) materials were analysed by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). For bioactivity study, small holes of dentin discs were filled with either materials, immersed in PBS for 15 days, and analysed with FTIR and scanning electron microscope with energy dispersive X-ray (SEM/EDX). The calculation of crystallinity and carbonate/phosphate (CO3/PO4) ratio of surface precipitates (from FTIR) and calcium/phosphate (Ca/P) ratio (from EDX) was statistically analysed using t-test or ANOVA, respectively, at 0.05 significance. Results. Both materials are tricalcium silicate-based that finally react to be calcium silicate hydrate. NeoMTA Plus has relatively high aluminium and sulfur content, with tantalum oxide as an opacifier instead of zirconium oxide in MTA Angelus. NeoMTA Plus showed better apatite formation, higher crystallinity and Ca/P but lower CO3/PO4 ratio than MTA Angelus. SEM showed globular structure with a small particle size in NeoMTA Plus while spherical structure with large particle size in MTA Angelus. Conclusion. Due to fast setting, higher crystallinity, and better bioactivity of NeoMTA Plus, it can be used as a pulp and root repair material.

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Liu, Ting, Bing Chang i Kun Wu. "The performance of phosphate removal using aluminium-manganese bimetal oxide coated zeolite: batch and dynamic adsorption studies". Desalination and Water Treatment 57, nr 9 (16.12.2014): 4220–33. http://dx.doi.org/10.1080/19443994.2014.991759.

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Elliott, Peter. "Refinement of the crystal structure of sieleckiite and revision of its symmetry". Mineralogical Magazine 81, nr 4 (sierpień 2017): 917–22. http://dx.doi.org/10.1180/minmag.2016.080.143.

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AbstractThe crystal structure of the copper aluminium phosphate mineral sieleckiite, Cu3Al4(PO4)2 (OH)12·2H2O, from the Mt Oxide copper mine, Queensland, Australia was solved from single-crystal X-ray diffraction data utilizing synchrotron radiation. Sieleckiite has monoclinic rather than triclinic symmetry as previously reported and is space group C2/m with unit-cell parameters a = 11.711(2), b = 6.9233(14), c = 9.828(2) Å, β = 92.88(3)°, V = 795.8(3) Å3and Z = 2. The crystal structure, which has been refined to R1 = 0.0456 on the basis of 1186 unique reflections with Fo > 4σF, is a framework of corner-, edge- and face- sharing Cu and Al octahedra and PO4 tetrahedra.

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Caliskan, Secil, Nuray Tuloglu i Sule Bayrak. "Clinical applications of BioAggregate in pediatric dentistry: Case reports". Srpski arhiv za celokupno lekarstvo 147, nr 11-12 (2019): 746–50. http://dx.doi.org/10.2298/sarh190509124c.

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Introduction. Calcium-silicate-based, nanoparticle-sized BioAggregate is produced as an alternative version of mineral trioxide aggregate (MTA). It contains additives such as calcium phosphate and silicon dioxide but does not contain aluminium oxide and bismuth oxide. Studies have shown that BioAggregate?s calcium-ion release is better than these qualities in MTA concerning fracture and acid resistance, biocompatibility and sealing ability. Case outline. In this paper, we examine eight case reports. These reports describe the long-term results of using BioAggregate in areas such as pulpotomy and root canal treatment in primary and permanent teeth, partial pulpotomy, artificial apical barrier construction of permanent teeth, root resorption repair, and treatment of dens in dente. Conclusion. As evidenced by the case reports examined here, BioAggregate can be used as alternative material to MTA in many dental treatments. These reports also show that the biocompatibility, antibacterial properties, hardening when moisture is present, ideal expansion percentage, impermeability, and dentine adhesion features of BioAggregate provide advantages in clinical use.

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Guo-Hua, Lv, Gu Wei-Chao, Chen Huan, Li Li, Niu Er-Wu i Yang Si-Ze. "Microstructure and Corrosion Performance of Oxide Coatings on Aluminium by Plasma Electrolytic Oxidation in Silicate and Phosphate Electrolytes". Chinese Physics Letters 23, nr 12 (29.11.2006): 3331–33. http://dx.doi.org/10.1088/0256-307x/23/12/058.

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Karlsson, Philip M., Michael W. Anderson i Anders E. C. Palmqvist. "Adsorption of sodium dodecyl sulfate and sodium dodecyl phosphate at the surface of aluminium oxide studied with AFM". Corrosion Science 52, nr 4 (kwiecień 2010): 1103–5. http://dx.doi.org/10.1016/j.corsci.2009.11.014.

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Hammond, L. L., S. H. Chien, A. H. Roy i A. U. Mokwunye. "Solubility and agronomic effectiveness of partially acidulated phosphate rocks as influenced by their iron and aluminium oxide content". Fertilizer Research 19, nr 2 (czerwiec 1989): 93–98. http://dx.doi.org/10.1007/bf01054680.

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TAKAHASHI, Norimitsu, Hidenori FUNASAKA i Tadao SHIMIZU. "Formation of Aluminium Oxide Film on Al Substrate by Micro-Arc-Technology in Electrolytic Solution of Sodium Phosphate Systems". Journal of the Ceramic Society of Japan 113, nr 1321 (2005): 616–19. http://dx.doi.org/10.2109/jcersj.113.616.

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Liu, Ying, Lin Wu, Ling Tong, Xiaoyu Yang, Ao Chen, Yilai Zhou, Zhiyuan Liao, Baoguo Zhang i Ya Hu. "Preparation of reduced graphene oxide and its application in chromium-free inorganic insulating coating for oriented silicon steel". Journal of Physics: Conference Series 2076, nr 1 (1.11.2021): 012059. http://dx.doi.org/10.1088/1742-6596/2076/1/012059.

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Abstract In the fields of military industry, national defence and major engineering, oriented silicon steel is an indispensable material, but the chromium-containing insulating coating coated on its surface is harmful to the environment and humans. Due to poor performance, the industrialization of chromium-free inorganic coating is hindered. To improve the corrosion resistance of chromium-free inorganic insulating coating for oriented silicon steel, reduced graphene oxide (rGO) was prepared by the hydrothermal reduction method and added to the basic chromium-free inorganic insulating coating composed of small-particle silica sol, large-particle silica sol and aluminium dihydrogen phosphate to obtain rGO-containing coating. Scanning electron microscopy (SEM) and Raman spectroscopy were used to analyse the microscopic morphology and structural characteristics of rGO. Electrochemical impedance spectroscopy (EIS) and Tafel polarization curves were used to test the corrosion resistance of the coating. The results show that the prepared rGO has a multi-layer structure with a smaller size than graphene oxide (GO) and can be dispersed in water-based coatings. And rGO can reduce the corrosion current density of the coating by two orders of magnitude, and improve the corrosion resistance of the coating.

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Al–Makramani, Bandar M. A., Abdul A. A. Razak, Mohamed I. Abu–Hassan, Fuad A. Al–Sanabani i Fahad M. Albakri. "Effect of Luting Cements On the Bond Strength to Turkom-Cera All-Ceramic Material". Open Access Macedonian Journal of Medical Sciences 6, nr 3 (9.03.2018): 548–53. http://dx.doi.org/10.3889/oamjms.2018.111.

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BACKGROUND: The selection of the appropriate luting cement is a key factor for achieving a strong bond between prepared teeth and dental restorations.AIM: To evaluate the shear bond strength of Zinc phosphate cement Elite, glass ionomer cement Fuji I, resin-modified glass ionomer cement Fuji Plus and resin luting cement Panavia-F to Turkom-Cera all-ceramic material.MATERIALS AND METHODS: Turkom-Cera was used to form discs 10mm in diameter and 3 mm in thickness (n = 40). The ceramic discs were wet ground, air - particle abraded with 50 - μm aluminium oxide particles and randomly divided into four groups (n = 10). The luting cement was bonded to Turkom-Cera discs as per manufacturer instructions. The shear bond strengths were determined using the universal testing machine at a crosshead speed of 0.5 mm/min. The data were analysed using the tests One Way ANOVA, the nonparametric Kruskal - Wallis test and Mann - Whitney Post hoc test.RESULTS: The shear bond strength of the Elite, Fuji I, Fuji Plus and Panavia F groups were: 0.92 ± 0.42, 2.04 ± 0.78, 4.37 ± 1.18, and 16.42 ± 3.38 MPa, respectively. There was the statistically significant difference between the four luting cement tested (p < 0.05).CONCLUSION: the phosphate-containing resin cement Panavia-F exhibited shear bond strength value significantly higher than all materials tested.

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Mishra, K. C., I. Osterloh, H. Anton, B. Hannebauer, P. C. Schmidt i K. H. Johnson. "Electronic Structures and Host Excitation of LaPO4, La2O3, and AlPO4". Journal of Materials Research 12, nr 8 (sierpień 1997): 2183–90. http://dx.doi.org/10.1557/jmr.1997.0292.

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We report the electronic structures and associated optical properties of three inorganic oxides, namely lanthanum oxide, aluminum phosphate, and lanthanum phosphate, calculated by the first principles augmented spherical wave (ASW) and full potential linear muffin tin orbital (FP-LMTO) band structure methods, and the self-consistent field Xα scattered wave (Xα SW) molecular orbital cluster approach. Our calculations indicate negligible effect of the choice of exchange correlation potentials on the position, shape, and relative ordering of the energy bands. The ASW energy gaps in lanthanum phosphate and aluminum phosphate agree satisfactorily with the measured values. A comparison of the electronic density of states for an isolated phosphate group from molecular orbital calculation and that of the valance band from the band structure methods indicates that the nature of bonding within the phosphate groups does not change in aluminum and lanthanum phosphates. The states near the top of the valence band and bottom of the conduction band are mostly due to the phosphate bonding and antibonding orbitals, indicating that optical absorption near the band edge involves excitation of electrons from the bonding levels to antibonding levels associated with phosphate groups. This explains why the optical gaps in many rare earth phosphates are nearly equal.

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Bairwa, Rajendra, Mamta ., Nintu Mandal, Nilanjan Chattopadhyaya i Neeraj Bagoria. "Adsorption and Desorption of zinc in soil and its implication". International Journal of Agricultural Invention 3, nr 02 (27.11.2018): 191–202. http://dx.doi.org/10.46492/ijai/2018.3.2.17.

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Zn availability mostly regulated through adsorption-desorption on soil (or adsorbent). Fly ash (FA) application influence on zinc adsorption-desorption in recommended chemical fertilizer (RDF) and farmyard manure (FYM) treatments of acidic Inceptisols of Assam. Zinc adsorption was better explained by Freundlich over the Langmuir adsorption equation. Adsorption was greatest in the treatment receiving FA only at 15 t ha−1 and least in the treatment receiving RDF 50 percent + FYM 5 t ha−1 + FA 5 t ha−1. Ni and Zn co-sorption to aluminium oxides (γ-Al2O3) in binary-sorbate systems were compared to their sorptionin single-sorbate systems as a function of pH using both macroscopic batch experiments and synchrotron-based X-ray absorption fine structure spectroscopy At pH 6.0, Ni and Zn were sorbed as inner-sphere surface complexes and competed for the limited number of reactive sites on γ-Al2O3.In binary-sorbate systems, Ni had no effect on Zn sorption, owning to its lower affinity for the metal oxide surface. In contrast, Zn had a higher affinity for the metal oxide surface and reduced Ni sorption. The influence of P on the Zn adsorption capacity of eight surface horizons in soils on granite and amphibolites materials. The presence of P, especially at high concentrations, was found to boost Zn adsorption. The effect was more marked in the soils on amphibolite, which contained increased concentrations of Fe and Al oxides relative to those on granite. The increased adsorption of zinc by effect of the presence of phosphate is ascribed primarily to the formation of a P–Zn complex in colloid surfaces.Studies should be undertaken while considering adsorption and desorption capacities of Zn for soils as well as ionic interactions for better Zn management in soils.

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K., Mbene, Tening A.S., Suh C.E. i Fomenky N.N. "The Influence of Organic Matter on Phosphorus Fixation in Soils from the Eastern Flank of Mount Cameroon". African Journal of Environment and Natural Science Research 6, nr 3 (23.08.2023): 1–22. http://dx.doi.org/10.52589/ajensr-izwspokl.

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The maximum phosphate fixation (KF) and phosphorus sorption capacity (PSC) of soil samples collected from the surface and sub-surface horizons of five volcanic soil profiles from the eastern flank of Mount Cameroon were investigated before and after organic matter removal. The aim of this research was to investigate the influence of soil organic matter (OM) on phosphorus (P) fixation. The removal of soil OM from the soil samples was accomplished by the use of sodium hypochlorite. Phosphorus fixation studies were performed on the treated and untreated soil samples using calcium chlorite as the background electrolyte. Fixation data were interpreted with Freundlich adsorption isotherm. The results indicated that the removal of OM had an influence on both KF and PSC. Removal of soil OM decreased PSC and increased KF for all soils. The inhibition of aluminium oxide and the reduction of soil surface area after the removal of OM were the justifications for the increase in P fixation.

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Ramirez, Paula Duenas, Chaedong Lee, Rebecca Fedderwitz, Antonia R. Clavijo, Débora P. P. Barbosa, Maxime Julliot, Joana Vaz-Ramos i in. "Phosphate Capture Enhancement Using Designed Iron Oxide-Based Nanostructures". Nanomaterials 13, nr 3 (1.02.2023): 587. http://dx.doi.org/10.3390/nano13030587.

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Phosphates in high concentrations are harmful pollutants for the environment, and new and cheap solutions are currently needed for phosphate removal from polluted liquid media. Iron oxide nanoparticles show a promising capacity for removing phosphates from polluted media and can be easily separated from polluted media under an external magnetic field. However, they have to display a high surface area allowing high removal pollutant capacity while preserving their magnetic properties. In that context, the reproducible synthesis of magnetic iron oxide raspberry-shaped nanostructures (RSNs) by a modified polyol solvothermal method has been optimized, and the conditions to dope the latter with cobalt, zinc, and aluminum to improve the phosphate adsorption have been determined. These RSNs consist of oriented aggregates of iron oxide nanocrystals, providing a very high saturation magnetization and a superparamagnetic behavior that favor colloidal stability. Finally, the adsorption of phosphates as a function of pH, time, and phosphate concentration has been studied. The undoped and especially aluminum-doped RSNs were demonstrated to be very effective phosphate adsorbents, and they can be extracted from the media by applying a magnet.

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Szara, Ewa, Tomasz Sosulski i Magdalena Szymańska. "Impact of long-term liming on sandy soil phosphorus sorption properties". Soil Science Annual 70, nr 1 (1.03.2019): 13–20. http://dx.doi.org/10.2478/ssa-2019-0002.

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Abstract The static fertilisation experiment conducted in Skierniewice (Central Poland) since 1923 investigates the effect of mineral fertilisation with lime (CaNPK) or without lime (NPK) on the accumulation and release of phosphorus in reference to phosphorus sorption properties in the sandy soil profile. In the case of application of same doses of mineral fertilisers, the content of total phosphorus was higher in NPK than CaNPK soil. Parameters related to sorption capacity and bonding energy from Langmuir and Freundlich model of P sorption were significantly lower in CaNPK than NPK soil profile. This was particularly caused by a lower content of poorly crystallised hydro(oxide) aluminium and iron forms in CaNPK than NPK soil. Higher content of oxide-extractable and bioavailable phosphorus extracted with double lactate solution, dissolved reactive phosphorus in water solution as well as degree of phosphorus saturation in the CaNPK soil profile suggests higher mobility and possibility of occurrence of losses of phosphorus from the profile of limed soil than from acidified soil. Therefore, management of phosphate fertilizers on permanently limed sandy soils requires the optimisation of phosphorus doses to a greater degree corresponding to the actual take-off of the element with crop. An additional finding of the study was evidence of the possibility of re-estimating contents of bioavailable phosphorus and, as a consequence, the degree of phosphorus saturation with Mehlich3 method in strongly acid soil receiving P mineral fertilisers, which can make it difficult to use the test for fertiliser recommendation.

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Nur Aainaa, Hasbullah, Osumanu Haruna Ahmed, Susilawati Kasim i Nik Muhamad Ab. Majid. "Reducing Egypt Rock Phosphate Use in Zea mays Cultivation on an Acid Soil Using Clinoptilolite Zeolite". Sustainable Agriculture Research 4, nr 1 (3.12.2014): 56. http://dx.doi.org/10.5539/sar.v4n1p56.

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Insufficient supply of P for initial growth of crops does not only limit N uptake but it also leads to poor yield of crops. In acidic soils of the tropics, sorption of P occurs mainly on surfaces of Fe and Al oxides and hydroxides. Most of the P added through mineral fertilizers is fixed by high Al and Fe oxide concentrations and transformed into insoluble P compounds. Reduction of Al and Fe is important so as to ensure adequate supply and readily available P for crops uptake. A number of studies using zeolites as an amendment in the fertilization programs of crops have improved crops production, nutrients uptake, and nutrients use efficiency. However, there is dearth of information on the use of clinoptilolite zeolite (CZ) to reduce P fixation not to mention reduction of N, P, and K fertilizers use in agriculture. This study was conducted to: (i) determine dry matter production, nutrients concentration, nutrients uptake, and use efficiency of Zea mays (Hibrimas variety) by including CZ in the fertilization program of Zea mays planted on an acidic soil, and (ii) determine the effect of including CZ in the fertilization program of Zea mays on selected chemical properties of an acidic soil. Egypt rock phosphate (ERP), urea, and muriate of potash were used in this study. Seventy five percent (w/w) of the recommended N, P, and K fertilizers for Zea mays were combined with CZ. Standard procedures were used to determine soil pH, inorganic nitrogen, available phosphorus, exchangeable aluminium, iron, potassium, calcium, magnesium, and organic matter before and after planting. Zea mays were harvested at tasselling stage and measured for dry matter production, nutrients uptake and use efficiency. The effect of CZ application with 75% of fertilizers (E2) and 100% fertilizers (E1) were statistically similar for selected soil chemical properties, dry matter production, nutrients concentration, uptake of nutrients, and nutrients use efficiency except for N. Nitrogen use efficiency for E2 was better than that of E1. These findings suggest that adoption of CZ with 25% reduction of N, P, and K fertilizers are useful. Further field trials and economic analysis are recommended to confirm the findings of this study. These aspects are being investigated in our on-going field experiments.

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35

Shin, Euisup S., Ill Yong Kim, Sung Baek Cho i Chikara Ohtsuki. "Inhibitory Effects of Doped Aluminum and Silicon on HAp-Forming Ability of Titania in Simulated Body Fluid". Key Engineering Materials 529-530 (listopad 2012): 641–45. http://dx.doi.org/10.4028/www.scientific.net/kem.529-530.641.

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Chemical modification of titanium substrate provides ability of hydroxyapatite (HAp) formation that is important property for bone-bonding capability after implantation in bony defects. Potential of the HAp-formation is occasionally reduced. In the present study, we investigated potential of the HAp-formation on titanium oxide (titania) with doped silicon or aluminum in simulated body fluid (SBF). Sol-gel processing was applied to prepare titania with doped silicon (TSx) or aluminum (TAx), in its nominal composition ranging from 0 to 10 mol%. Specific surface area of the prepared samples was gradually increased with increasing the amounts of silicon or aluminum. Zeta potential of TAx was definite changed from negative charge to positive charge with increasing aluminum amounts, but TSx slightly changed to be positive with increasing silicon amounts. The pure titania sample free from doping of silicon or aluminum showed formation of calcium phosphate precipitates, that is HAp-formation, after soaking in SBF for 14 d. In contrast, all the titania samples with doped silicon or aluminum hardly showed evidence of precipitates of calcium phosphates, although absorption of calcium and phosphate ions were detected. Especially, TAx showed remarkable adsorption of phosphate ions. Aluminum-doping in titania enhances the adsorption of phosphate ion on the surface, but reduce nucleation rate of calcium phosphates in body environment.

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Benato, Roberto, Sebastian Dambone Sessa, Maura Musio, Francesco Palone i Rosario Polito. "Italian Experience on Electrical Storage Ageing for Primary Frequency Regulation". Energies 11, nr 8 (10.08.2018): 2087. http://dx.doi.org/10.3390/en11082087.

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The paper describes the results of different types of ageing tests performed by Terna (the Italian Transmission System Operator) applied to several electrochemical technologies, namely lithium-based and sodium-nickel chloride-based technologies. In particular, the tested lithium-based technologies exploit a graphite-based anode and the following cathode electrochemistries: lithium iron phosphate, lithium nickel cobalt aluminium, lithium nickel cobalt manganese, and lithium titanate. These tests have been performed in the storage labs located in Sardinia (Codrongianos) and Sicily (Ciminna). The aim of the storage labs is intended to give the electrical grid ancillary services, for example, primary frequency regulation, secondary frequency regulation, voltage regulation, synthetic rotational inertia provision, and many more. For the primary frequency regulation service, the ageing of the batteries is difficult to foresee as the ageing tests are not standardized. The authors proposed some novel cycle types, which showed that, in several cases, the frequency regulation cycle ages the batteries much more than the standard cycle. The standard cycle definition has been adopted in the paper to identify a battery cycle test that was carried out to uniformly compare and rank the different technologies. Moreover, sodium-nickel chloride batteries are unaffected by the types of cycle and have a negligible ageing. In addition, lithium manganese oxide and lithium titanate batteries show very good behaviour with a slight degradation of the dischargeable energy, irrespectively of the type of cycle. Inversely, lithium nickel cobalt aluminium technology shows a considerable ageing and a strong dependence on the cycle types. Even if the theoretical explanations of such aging behaviours need time to be understood and expounded, the authors are convinced that the scientific community should become aware of these experimental results.

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Vaidya, K. J., i L. F. Francis. "Processing of calcium metaphosphate-based glass-ceramic coatings on alumina". Journal of Materials Research 11, nr 1 (styczeń 1996): 100–109. http://dx.doi.org/10.1557/jmr.1996.0013.

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Dense, crystalline, glass-ceramic coatings containing calcium metaphosphate and aluminum phosphate were prepared on aluminum oxide substrates by a three-step method. The processing involved glass (40 mol% CaO, 10 mol% Al2O3, 50 mol% P2O5) formation, deposition of a glass particle coating, and heat treatment to sinter the glass and crystallize the phosphates. Sintering and microstructure evolution were influenced by wet coating thickness, heat-treatment temperature, time, and heating rate. Heat treatment for 1 h at 725 °C using a 50 °C/min heating rate was found to give a dense, crack-free coating. The resultant coating microstructure has spherulitic morphology (0.3 μm size) with aluminum phosphate in the center of the spherulite. The hardness of the fully crystallized glass-ceramic coating was ∼5.2 GPa.

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38

Mu, Cheng, i Jun Hui He. "Synthesis of RePO4 (Re=La, Nd, Pr, or Y) Nanowires by Chemical Precipitation in Nanochannels". Advanced Materials Research 181-182 (styczeń 2011): 495–500. http://dx.doi.org/10.4028/www.scientific.net/amr.181-182.495.

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Monodisperse nanowires of rare earth phosphates were synthesized by chemical precipitation method using anodic aluminum oxide (AAO) template. Scanning electron microscope (SEM) images indicated that rare earth phosphate nanowires are parallelly arranged in AAO template, all of which are in uniform diameter of about 50 nm. X-ray diffraction (XRD) patterns and high magnification transmission electron microscopy (HRTEM) images showed that the nanowires were polycrystal structure.

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Kisinyo, P. O., C. O. Othieno, S. O. Gudu, J. R. Okalebo, P. A. Opala, J. K. Maghanga, W. K. Ng’etich i in. "Phosphorus Sorption and Lime Requirements of Maize Growing Acid Soils of Kenya". Sustainable Agriculture Research 2, nr 2 (28.01.2013): 116. http://dx.doi.org/10.5539/sar.v2n2p116.

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In Kenya, maize (Zea mays L.) is mainly grown on acid soils in high rainfall areas. These soils are known for low available phosphorus (P), partly due to its sorption by aluminium (Al) and iron oxides. The study determined soil P sorption, lime requirements and the effects of lime on soil pH, Al levels and available P on the main maize growing acids soils in the highlands east and west of Rift Valley (RV), Kenya. Burnt lime containing 21% calcium oxide was used. The soils were strongly to extremely acid (pH 4.85-4.07), had high exchangeable Al3+ (> 2 cmol Al kg-1) and Al saturation (> 20% Al), which most maize germplasm grown in Kenya are sensitive to. The base cations, cation exchange capacity and available P (< 10 mg P kg-1 bicarbonate extractable P) were low, except at one site in the highlands east of RV indicative with history of high fertilizer applications. Highlands east of RV soils had higher P sorption (343-402 mg P kg-1) than the west (107-258 mg P kg-1), probably because of their high Al3+ ions and also the energies of bonding between the soil colloids and phosphate ions. Highlands east of RV also had higher lime requirements (11.4-21.9 tons lime ha-1) than the west (5.3-9.8 tons lime ha-1). Due to differences in soil acidity, Al levels and P sorption capacities within and between highlands east and west of RV, blanket P fertilizer and lime recommendations may not serve all soils equally well.

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Chang, Jeng-Kuei, Chi-Min Liao, Chih-Hsiung Chen i Wen-Ta Tsai. "Material characteristics and capacitive properties of aluminum anodic oxides formed in various electrolytes". Journal of Materials Research 19, nr 11 (1.11.2004): 3364–73. http://dx.doi.org/10.1557/jmr.2004.0434.

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The microstructure and composition of aluminum oxide films, formed by a two-step anodization process in various electrolytes at 100 V then subject to an intermediate heat treatment (500 °C, 2 min), were investigated. The anodization electrolytes used included ammonium adipate electrolyte, phosphoric acid electrolyte, ammonium dihydrogen phosphate electrolyte, and their mixtures. The cross-section morphologies, crystal structure, and chemical composition of aluminum anodic oxides were examined by transmission electron microscopy. X-ray photoelectron spectroscopy was carried out to study the surface chemical state of the anodic films. The corresponding capacitances and retention voltages of these oxide films were also explored. The results indicated that amorphous-to-crystalline transformation of the oxide, primarily in films formed in ammonium adipate electrolyte, was induced by the heat treatment. Electron diffraction analyses further revealed the oxide films consisted of two distinct zones, which included an inner amorphous layer and an outer layer containing crystalline γ′-Al2O3. This study found that the phosphorous species in either the primary or the re-anodization electrolytes had a potential to cause changes of Al and O distributions within the oxides. The oxide film primarily anodized in ammonium adipate and re-anodized in phosphoric acid had the highest capacitance due to its high degree of crystallinity and thinness compared to oxides formed in other electrolytes. The presence of phosphorus, from the primary anodization electrolytes, in the oxides could inhibit the formation of crystalline γ′-Al2O3 and, consequently, decrease the capacitances of the anodic films. At the same time, the retention voltage and hydration resistance of these oxide films were improved.

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Duwell, E. J., R. J. Cosmano, G. R. Abrahamson i J. J. Gagliardi. "Grinding Titanium With Coated Abrasives Under an Aqueous Solution of Inorganic Phosphate Salts". Journal of Engineering for Industry 110, nr 1 (1.02.1988): 19–24. http://dx.doi.org/10.1115/1.3187836.

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Aqueous solutions of inorganic salts are known to be effective grinding lubricants for titanium. Early work by Professor Shaw at MIT drew particular attention to the use of phosphate salts, and although not commercially available as grinding fluids, some metal fabricators have compounded phosphate-containing fluids for their own use from the raw chemicals. In this paper, the dynamics of grinding Ti(6Al-4V) alloy are described using phosphate salt solutions. The results show that both aluminum oxide and silicon carbide coated abrasive belts have unique advantages in this application, with aluminum oxide exhibiting easy penetration and fast cutting behavior early on, while silicon carbide appears to have longer range durability.

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A. Hussein, Hussein, Mohammed J. Kahdim i Alaa Abdulhasan Atiyah. "Corrosion Behaviour of Passive Layer Growth by Controlling Additives of Nano-Metals-Phosphate to Pure Aluminum". Diyala Journal of Engineering Sciences 13, nr 4 (9.12.2020): 1–9. http://dx.doi.org/10.24237/djes.2020.13401.

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This study investigates how microstructure and chemistry effects by Nano-Metal-Phosphate and the kinetics of growth passive layer and passivity breakdown. Additionally, the passive layer germination behavior on aluminum alloy 1050 with anticorrosive properties. The passive layer is an alloying method which allows an aluminum oxide to germinate. Morphologically and structurally, the aluminum oxide films were characterized using microscopy analyzes and XRD analysis. Results indicated that the reinforcements are well distributed and the grin size is downy. Corrosion behavior tested by Cyclic polarization exam and done at room temperature in (3.5 per cent NaCl) solution. The reinforcement increased the hardness for processed aluminum from Hv81.1 to HV=120.492 as castings. The parameter Nano-Metal-Phosphate has attenuated the current density of corrosion (7.15μA / cm2) compared to the as-cast sample results.

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Zou, Chao, Da Hai Zhang, Yi Li, Wen Jian Weng, Kui Cheng, Chen Lu Song, Gao Ling Zhao i in. "Phase Evolution of Aluminum-Chromium-Phosphate Binders during Heat-Treatment". Key Engineering Materials 336-338 (kwiecień 2007): 1280–83. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1280.

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Aluminum phosphate is one of the best inorganic binders, and the addition of chromium oxide can improve the properties of the binder. In this work, the phase evolutions in chromium phosphate system and aluminum-chromium-phosphate system during heat-treatment were investigated. The initial binder solutions were prepared by dissolving Al(OH)3 and Cr2O3 in aqueous H3PO4 solution. The binder solutions consolidated at 100°C. The as-consolidated products were heated at different temperature. The experimental results showed the phase evolution of the consolidated products as: amorphous phase in 300~800°C, Cr(PO3)3 and Cr4(P2O7)3 in 900~1200°C for chromium phosphate system binder; amorphous phase in 300~1000°C, Cr(PO3)3 and AlPO4 in 1100°C, Cr4(P2O7)3 and AlPO4 in 1200°C for aluminumchromium- phosphate system binder. The addition of chromium oxide demonstrates to strengthen amorphous network, which further improves the thermal stability.

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Tanada, Seiki, Mineaki Kabayama, Naohito Kawasaki, Toru Sakiyama, Takeo Nakamura, Mamiko Araki i Takamichi Tamura. "Removal of phosphate by aluminum oxide hydroxide". Journal of Colloid and Interface Science 257, nr 1 (styczeń 2003): 135–40. http://dx.doi.org/10.1016/s0021-9797(02)00008-5.

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Dziuba, Kamil, Krystyna Wnuczek, Patryk Wojtachnio, Rodolphe Sonnier i Beata Podkościelna. "New Polymer Composites with Aluminum Phosphates as Hybrid Flame Retardants". Materials 16, nr 1 (2.01.2023): 426. http://dx.doi.org/10.3390/ma16010426.

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Polymeric aluminum organophosphates are a class of nanostructured aluminum-based compounds that can be considered organic and inorganic hybrid materials. Aluminum phosphates have attracted considerable interest due to their ability to enhance composite materials’ mechanical characteristics, lightweight, and thermal properties. Extensive studies have shown the potential of aluminum organophosphates as a component in the development of fire-retardant materials. Aluminum–organophosphorus hybrid (APH) materials have been prepared by reacting aluminum oxide hydroxide (boehmite) with alkyl and aryl phosphoric acids and used to prepare composites with epoxy resin. Boehmite is an aluminum oxide hydroxide (γ-AlO(OH)) mineral, a component of the aluminum ore bauxite. In this work, the composites based on epoxy resin Epidian 601 and commercial curing agent IDA were obtained. Pure boehmite and APH hybrids were added as flame retardants. FTIR and TGA analysis showed that obtained APH possesses a hybrid structure, high thermostability, and various morphologies. These new APH were incorporated into epoxy resin. The infrared spectroscopy confirmed the structure of hybrids and composites. Pyrolysis combustion flow calorimetry (PCFC) and cone calorimeter analyses were performed to assess the flame retardant properties of the composites. The results showed that the incorporation of 17 wt% APH allows a reduction of heat release rate but to a limited extent in comparison to pure boehmite, which is due to the different decomposition mechanisms of both boehmite and hybrids. The cone calorimetry test showed that residue contents correspond quite well to the mineral fraction from boehmite only. The hybrid APHs appear no more efficient than pure boehmite because the mineral fraction in APH is reduced while phosphate fraction cannot promote significant charring.

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Kale, Ediz, Ayça Deniz İzgi i Remzi Niğiz. "Bond Strength Evaluation of Inlay-Retained Resin-Bonded Fixed Partial Dentures with Two Different Cavity Designs and Two Different Adhesive Systems: In Vitro Study". Balkan Journal of Dental Medicine 24, nr 1 (1.03.2020): 21–28. http://dx.doi.org/10.2478/bjdm-2020-0004.

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SummaryBackground/Aim: The purpose of this in-vitro study was to compare the resin-bonded fixed partial dentures (RBFPD) fabricated using two different structural designs and two different antibacterial adhesive lutting protocols in regard to their resistance to debonding.Material and Methods: Forty samples for a model with single missing molar were divided into 4 groups (M1, M2, C1, C2) (n=10). M1 and M2 were prepared in accordance with modified inlay slot-cavity retained RBFPD design; C1 and C2 were prepared according to conventional inlay slot-cavity retained RBFPD design. M1 and C1 cavities were treated with 2% chlorhexidine-based (CHX) cavity disinfectant and 10-methacryloyloxydecyl dihydrogen phosphate (MDP) containing adhesive system; M2 and C2 cavities were treated with MDP and 12-methacryloyloxydodecylpyridinium bromide (MDPB) containing adhesive system featuring antibacterial cavity cleansing effect. The RBFPDs were made of base-metal alloy and their fit surfaces sandblasted with aluminium oxide (Al2O3). Adhesive resin cement was used for cementation, and the RBFPD retainers were interlocked into their corresponding inlay cavities using composite resin. After 1 week being immersed in aqueous environment, the RBFPDs were subjected to tensile loading at a crosshead speed of 1 mm/min until failure. One way ANOVA and Tukey HSD tests were used for statistical evaluation (α=0.05). Mode of failure and tooth damage was also noted.Results: Mean tensile bond strength values were 356 N for M1, 305 N for M2, 467 N for C1, and 455 N for C2. Tensile strength values of C1 and C2 were significantly higher than those of M1 and M2 (p<0.05). The mode of failure was mostly adhesive in character at the metal-cement interface in all groups. Tooth fracture was observed nearly in all specimens. No significant difference was detected between the antibacterial adhesive lutting protocols (p>0.05).Conclusions: The RBFPDs with the conventional design were found to be more retentive than those with the modified design. Using an adhesive system featuring antibacterial properties with no need of separate antibacterial agent application during bonding may be favourable.

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Meyers, Stephen T., Jeremy T. Anderson, David Hong, Celia M. Hung, John F. Wager i Douglas A. Keszler. "Solution-Processed Aluminum Oxide Phosphate Thin-Film Dielectrics". Chemistry of Materials 19, nr 16 (sierpień 2007): 4023–29. http://dx.doi.org/10.1021/cm0702619.

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Wang, Xiaoming, Brian Phillips, Jean-François Boily, Yongfeng Hu, Zhen Hu, Peng Yang, Xionghan Feng, Wenqian Xu i Mengqiang Zhu. "Phosphate Sorption Speciation and Precipitation Mechanisms on Amorphous Aluminum Hydroxide". Soil Systems 3, nr 1 (20.03.2019): 20. http://dx.doi.org/10.3390/soilsystems3010020.

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Aluminum (Al) oxides are important adsorbents for phosphate in soils and sediments, and significantly limit Phosphate (P) mobility and bioavailability, but the speciation of surface-adsorbed phosphate on Al oxides remains poorly understood. Here, phosphate sorption speciation on amorphous Al hydroxide (AAH) was determined under pH 3–8 and P concentration of 0.03 mM–15 mM using various spectroscopic approaches, and phosphate precipitation mechanisms were discussed as well. AAH exhibits an extremely high phosphate sorption capacity, increasing from 3.80 mmol/g at pH 7 to 4.63 mmol/g at pH 3. Regardless of reaction pH, with increasing P sorption loading, the sorption mechanism transits from bidentate binuclear (BB) surface complexation with dP-Al of 3.12 Å to surface precipitation of analogous amorphous AlPO4 (AAP), possibly with ternary complexes, such as (≡Al-O)2-PO2-Al, as intermediate products. Additionally, the percentage of precipitated phosphate occurring in AAP linearly and positively correlates with P sorption loading. Compared to phosphate reaction with ferrihydrite, phosphate adsorbs and precipitates more readily on AAH due to the higher solubility product (Ksp) of AAH. The formation of AAP particles involves AlIII release, which is promoted by phosphate adsorption, and its subsequent precipitation with phosphate at AAH surfaces or in the bulk solution.

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Joyce, Nicholas, Daniel Layton-Matthews, Kurt Kyser, Matthew Leybourne, Kevin Ansdell, Tom Kotzer, David Quirt i Gerard Zaluski. "Alteration mineralogy and pathfinder element inventory in the footprint of the McArthur River unconformity-related uranium deposit, Canada". Canadian Mineralogist 59, nr 5 (1.09.2021): 985–1019. http://dx.doi.org/10.3749/canmin.2000067.

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ABSTRACT Pathfinder elements associated with the exploration footprint of the McArthur River unconformity-related U deposit include U, radiogenic Pb, V, Ni, Co, Cu, Mo, As, Zn, and rare earth elements. In this study, the mineralogical and paragenetic context for their occurrence was established by integrating in situ mineral chemistry and laser ablation mass spectrometry chemical mapping of interstitial assemblages, detrital grains, and cements with whole-rock analyses of drill core samples from the diagenetically altered background and the hydrothermally altered sandstone host rocks. Diagenetically altered background sandstones contain a matrix assemblage of illite and dickite, with trace to minor aluminum-phosphate-sulfate (APS) minerals, apatite, and Fe-Ti oxide minerals. Aluminum-phosphate-sulfate minerals account for the majority of the Sr and light rare earth element concentrations, whereas early diagenetic apatite, monazite, and apatite inclusions in detrital quartz and detrital zircon contribute significant U and heavy rare earth elements to samples analyzed with an aggressive leach (partial digestion) such as aqua regia. Hydrothermally altered sandstone host rocks also contain variable assemblages of Al-Mg chlorite (sudoite), alkali-deficient tourmaline, APS minerals, kaolinite, illite, Fe-oxide, and sulfide minerals. Late pre-mineralization chlorite accounts for a significant portion of the observed Ni concentrations, whereas Co, Cu, Mo, and Zn occur predominantly in cryptic sub-micron sulfide and sulfarsenide inclusions within clay mineral aggregates and in association with Fe-Ti oxides. Elevated concentrations of U were observed in cryptic micro-inclusions associated with sulfides in quartz overgrowths, with Fe-Ti oxide micro-inclusions in kaolinite, and in post-mineralization Fe-oxide veins. The distribution of pathfinder elements throughout the deposit footprint appears to be less related to the primary dispersion of alteration minerals from the hydrothermal system than to the secondary dispersion of elements post-mineralization. Their occurrence throughout pre-, syn-, and post-mineralization assemblages further demonstrates the limitations to defining geochemical footprints from pathfinder element concentrations expressed in lithogeochemical data sets without structural, lithological, and mineralogical context.

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Vanin, A. I., Yu A. Kumzerov, V. G. Solov’ev, S. D. Khanin, S. E. Gango, M. S. Ivanova, M. M. Prokhorenko, S. V. Trifonov, A. V. Cvetkov i M. V. Yanikov. "Electrical and Optical Properties of Nanocomposites Fabricated by the Introduction of Iodine in Porous Dielectric Matrices". Glass Physics and Chemistry 47, nr 3 (maj 2021): 229–34. http://dx.doi.org/10.1134/s1087659621030123.

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Abstract The electrical and optical properties of nanocomposite materials fabricated by the dispersion of iodine in porous dielectric matrices of zeolites, zeolite-like aluminum phosphates, opals, asbestos, and porous aluminum oxide are studied. It is demonstrated that the physical properties of the produced nanocomposites depend significantly on the structure of a matrix.

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