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Journal articles on the topic 'Allophagie'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Parfitt, R. L. "Allophane and imogolite: role in soil biogeochemical processes." Clay Minerals 44, no. 1 (2009): 135–55. http://dx.doi.org/10.1180/claymin.2009.044.1.135.

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AbstractThe literature on the formation, structure and properties of allophane and imogolite is reviewed, with particular emphasis on the seminal contributions by Colin Farmer. Allophane and imogolite occur not only in volcanic-ash soils but also in other environments. The conditions required for the precipitation of allophane and imogolite are discussed. These include pH, availability of Al and Si, rainfall, leaching regime, and reactions with organic matter. Because of their excellent water storage and physical properties, allophanic soils can accumulate large amounts of biomass. In areas of

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2

Parfitt, R. L., A. Parshotam, and G. J. Salt. "Carbon turnover in two soils with contrasting mineralogy under long-term maize and pasture." Soil Research 40, no. 1 (2002): 127. http://dx.doi.org/10.1071/sr00105.

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Total organic carbon (C) and natural 13C abundance were measured in adjacent allophanic soils (Andisols) and non-allophanic soils (Inceptisols) under maize (Zea mays L.) and ryegrass pasture (Lolium perenne L.) to assess the C turnover rate in soils of contrasting mineralogy and specific surface area. The allophanic soil contained more total C than the non-allophanic soil (139 v. 101 t C&sol;ha in the upper 0–35 cm) but neither soil showed a significant difference in C content between pasture and maize, provided maize residue was retained and incorporated. The gross annual inputs under mai

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3

Onodera, Yoshio, Takashi Iwasaki, Abhijit Chatterjee, et al. "Bactericidal allophanic materials prepared from allophane soil." Applied Clay Science 18, no. 3-4 (2001): 123–34. http://dx.doi.org/10.1016/s0169-1317(00)00038-7.

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4

Onodera, Yoshio, Shunji Sunayama, Abhijit Chatterjee, et al. "Bactericidal allophanic materials prepared from allophane soil." Applied Clay Science 18, no. 3-4 (2001): 135–44. http://dx.doi.org/10.1016/s0169-1317(00)00039-9.

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5

Perez del Villar, L., M. C. Moro, and M. L. Cembranos. "Allophane in weathered zones of barite ore deposits (Vide de Alba and San Blas, Zamora, Spain): mineralogy and genesis." Clay Minerals 27, no. 3 (1992): 309–23. http://dx.doi.org/10.1180/claymin.1992.027.3.04.

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AbstractThe allophane studied occurs in the weathered zones of the barite-sulphide-bearing dolomitic levels, interbedded in the barite ore deposits of Vide de Alba and San Bias (Province of Zamora). These ore deposits are interstratified in the Silurian-Devonian sulphide bearing volcano sedimentary materials of the Alcañices Synform. The allophanic samples have been studied by polarizing microscopy, SEM, XRD, DTA, TG, IRS, EMA and chemical analyses, the last after dissolving the samples by acid (HF + HNO3 + 3HCl + H3BO3) and alkaline digestion (0·5 m NaOH). It is suggested that allophane origi

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Moro, M. C., M. L. Cembranos, and A. Fernandez. "Allophane-like materials in the weathered zones of Silurian phosphate-rich veins from Santa Creu d'Olorda (Barcelona, Spain)." Clay Minerals 35, no. 2 (2000): 411–21. http://dx.doi.org/10.1180/000985500546873.

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AbstractAllophane-like materials occur in the weathered zones of the phosphate-rich veins hosted in Silurian metasediments of the Catalonian Coastal Ranges. These metasediments also host sulphide and phosphate sedimentary mineralizations. Mineralogical and geochemical investigations of the allophanic samples indicate that they comprise Si-rich allophane, with a molar SiO2/Al2O3 ratio ranging between 1.19 and 2.23, with amorphous Al-(Ca) phosphate and hydroxylapatite as major minerals, and minor goethite and quartz. It is assumed that allophane, amorphous Al-(Ca) phosphate and hydroxylapatite c

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7

Allbrook, RF. "Shrinkage of some New Zealand soils and its implications for soil physics." Soil Research 31, no. 2 (1993): 111. http://dx.doi.org/10.1071/sr9930111.

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Aggregates from three New Zealand soils were used to produce shrinkage curves. Each soil had a clay mineralogy dominated by a different mineral, namely allophane, halloysite and kaolinite.The curves showed marked differences. Only the allophanic soil showed structural shrinkage, and only the halloysitic soil showed residual shrinkage. When the slope of the normal shrinkage line is about unity, this indicates the soil is liable to crack- this was only shown by the allophanic soil. The implication for soil physics is that, since all soils with at least a moderate clay content shrink, bulk densit

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8

Gobin, Mukteshwar, Noriyuki Yasufuku, Midori Watanabe, Guojun Liu, and Ryohei Ishikura. "Influence of time on the small strain shear modulus of an allophanic volcanic ash." E3S Web of Conferences 544 (2024): 01005. http://dx.doi.org/10.1051/e3sconf/202454401005.

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The small strain shear modulus is an important parameter in the assessment of soil dynamics problems. Studies on the small strain shear stiffness of volcanic ash remain rare probably because globally they cover just under 1% of the land surface. However, on a regional scale, this figure may be consequential as in the case of Japan, where about one third of its total land surface is covered by andosols. In this research, we aimed at understanding the influence of confinement time, a non-negligible parameter, contingent on the soil type, which needs to be accounted for when assessing the shear m

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Chevallier, Tiphaine, Kenji Fujisaki, Olivier Roupsard, et al. "Short-range-order minerals as powerful factors explaining deep soil organic carbon stock distribution: the case of a coffee agroforestry plantation on Andosols in Costa Rica." SOIL 5, no. 2 (2019): 315–32. http://dx.doi.org/10.5194/soil-5-315-2019.

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Abstract. Soil organic carbon (SOC) constitutes the largest terrestrial C stock, particularly in the Andosols of volcanic areas. Quantitative information on distribution of SOC stocks is needed to construct a baseline for studying temporal changes in SOC. The spatial variation of soil short-range-order minerals such as allophane usually explains the variability of topsoil SOC contents, but SOC data for deeper soil layers are needed. We found that within a 1 km2 Costa Rican basin covered by coffee agroforestry, SOC stocks in the upper 200 cm of soil were highly variable (24 to 72 kg C m−2). Top

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10

Parfitt, RL. "Surface charge in some New Zealand soils measured at typical ionic strength." Soil Research 30, no. 3 (1992): 331. http://dx.doi.org/10.1071/sr9920331.

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The positive and negative surface charges of some New Zealand soils used for horticulture were measured at different pH values using 0.002 M CaCl2 solutions, Which have a similar ionic strength to soil solutions in New Zealand. The surface negative charge increased with pH for all soil samples including those containing mica and smectite. This behaviour was mainly due to the presence of organic matter and allophane both of which had an appreciable amount of variable negative charge. Allophanic soil B horizons had a higher positive charge than that of the Oxidic soils, which was less than 1 cmo

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11

He, Ming, and Yukiya Horikawa. "Stability of allophane, allophanic clay, and allophane-halloysite floc in aqueous solutions of an anionic exocellular heteropolysaccharide (Gum Xanthan) fromXanthomonas campestris." Soil Science and Plant Nutrition 42, no. 3 (1996): 603–12. http://dx.doi.org/10.1080/00380768.1996.10416329.

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12

Romero-Mancilla, Pablo Eduardo, José Miguel Montenegro-Cooper, Robert W. King, Pablo Lapeña-Mañero, and Carmen García-Casuso. "Experimental Investigation on the Influence of Oven-Drying on the Geotechnical Properties of Volcanic Ash-Derived Residual Soils." Applied Sciences 11, no. 24 (2021): 11708. http://dx.doi.org/10.3390/app112411708.

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For thousands of years, the volcanic activity present along the Andes Mountain range has generated a large amount of pyroclastic material. As a result, around 60 percent of the soils present in Chile have a volcanic origin, of which, we can find soils derived from volcanic ash. These correspond to soils whose origin is the weathering of volcanic ash, which generates minerals such as allophane, imogolite, and halloysite. The presence of these minerals gives these soils unique geotechnical properties, such as high plasticity, low dry unit weight, and a unique internal structure. Subjecting these

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13

Tulin, Anabella. "Characteristics of Interlayer Materials in Non-Allophanic Volcanic Ash and Red Yellow Soils from Japan." Science and Humanities Journal 5, no. 1 (2005): 1–23. http://dx.doi.org/10.47773/shj.1998.051.1.

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The characteristics and properties of interlayer materials from 10 non-allophanic (Melanudand) and red yellow soils (Alfisols and Ultisols) from three locations in Japan were studied by chemical extractions and x-ray diffraction (XRD) analyses. Allophane was dissolved from clay samples using 0.15 M acid oxalate solution while silicon and aluminum were dissolved using both 0.15 M acid oxalate and 0.3 M sodium citrate solutions. XRD analyses were done for the treated and untreated samples. For the chemically extracted samples, the clay samples were treated with bicarbonate citrate solution for t

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14

Wang, Shun, Peixin Du, Peng Yuan, et al. "Structural alterations of synthetic allophane under acidic conditions: Implications for understanding the acidification of allophanic Andosols." Geoderma 376 (October 2020): 114561. http://dx.doi.org/10.1016/j.geoderma.2020.114561.

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15

Close, M. E., G. N. Magesan, R. Lee, M. K. Stewart, and J. C. Hadfield. "Field study of pesticide leaching in an allophanic soil in New Zealand. 1: Experimental results." Soil Research 41, no. 5 (2003): 809. http://dx.doi.org/10.1071/sr02080.

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Seven pesticides, 2,4-D, atrazine, hexazinone, picloram, procymidone, terbuthylazine, and triclopyr, were applied to a Horotiu soil (allophanic loamy silt) located near Hamilton, New Zealand, along with 2 tracer compounds, bromide and deuterated water. Their movement and persistence was monitored for about 2�years using soil sampling down to a maximum of 1 m and 9 suction cups located between 0.2 and 2.5 m down the profile. There was rapid leaching of the tracers as well as hexazinone, picloram, and, to a lesser extent, triclopyr. Procymidone was much less mobile but was very persistent. Atraz

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Close, M. E., L. Pang, G. N. Magesan, R. Lee, and S. R. Green. "Field study of pesticide leaching in an allophanic soil in New Zealand. 2: Comparison of simulations from four leaching models." Soil Research 41, no. 5 (2003): 825. http://dx.doi.org/10.1071/sr02081.

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Seven pesticides were applied to an allophanic silt loam along with a bromide tracer and their concentrations in soil and water monitored over a 2-year period. Inverse modelling was carried out using GLEAMS, LEACHM, and HYDRUS-2D to derive field-based mobility and degradation parameters. Hexazinone and procymidone were more mobile and more persistent than most literature values would suggest, whereas picloram and triclopyr were much less mobile but more persistent. The greater mobility for hexazinone, a weak base, and the reduced mobility of picloram and triclopyr, weak acids, are consistent w

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17

Simamora, Jupri, Purba Marpaung, and Alida Lubis. "DETERMINATION TYPE OF ALLOPHANE ON ANDISOL IN DOLAT RAKYAT VILLAGE TIGA PANAH DISTRICT, REGENCY OF KARO." Jurnal Pertanian Tropik 2, no. 3 (2015): 228–38. http://dx.doi.org/10.32734/jpt.v2i3.2916.

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The aim of the research was to determinate the type of Allophane minerals by means of Thermogram and to know the type of Allophane minerals with Allophane–Organic Matter relations. The research was done in Dolat Rakyat villages, District of Tiga Panah Karo Regency, In Soil Fertility Laboratory University of North Sumatera, and College of Chemical Industry (PTKI), Medan in June - October 2014. Soil type is Andisol. The result of the research in Dolat Rakyat Village Tiga Panah District, Regency of Karo Thermogram interpretation showed that type of Allophane minerals Andisol that is Allophane B.

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18

Filimonova, Svetlana, Stephan Kaufhold, Friedrich E. Wagner, Werner Häusler, and Ingrid Kögel-Knabner. "The role of allophane nano-structure and Fe oxide speciation for hosting soil organic matter in an allophanic Andosol." Geochimica et Cosmochimica Acta 180 (May 2016): 284–302. http://dx.doi.org/10.1016/j.gca.2016.02.033.

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19

Airlangga, Tandaditya Ariefandra, Naoto Matsue, Eko Hanudin, and Erni Johan. "Phosphate Adsorption Capacity of Allophane from Two Volcanic Mountains in Indonesia." JOURNAL OF TROPICAL SOILS 25, no. 1 (2020): 39. http://dx.doi.org/10.5400/jts.2020.v25i1.39-46.

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Allophane is known as clay mineral with high capacity of phosphate adsorption via ligand-exchange mechanism. This study aims to compare the phosphate adsorption characteristics by allophane from Mt. Merapi and Mt. Lawu in relation to its chemical and mineralogical properties. The results of X-Ray Flourescence analysis shows that both allophane samples from Merapi and Lawu have low Si/Al ratio, i.e. 1.18 and 1.16, respectively. Infrared spectral characteristics of the allophane materials indicated that the main adsorption bands appeared at the range of 2700-3700 cm-1 (due to stretching vibratio

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20

Al Rawi, Sara, Sophie Louvet-Vallée, Abderazak Djeddi, et al. "Allophagy." Autophagy 8, no. 3 (2012): 421–23. http://dx.doi.org/10.4161/auto.19242.

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21

Calvelo Pereira, R., M. Camps Arbestain, F. M. Kelliher, et al. "Assessing the pore structure and surface area of allophane-rich and non-allophanic topsoils by supercritical drying and chemical treatment." Geoderma 337 (March 2019): 805–11. http://dx.doi.org/10.1016/j.geoderma.2018.10.037.

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22

Singleton, PL, M. Mcleod, and HJ Percival. "Allophane and halloysite content and soil solution silicon in soils from rhyolitic volcanic material, New Zealand." Soil Research 27, no. 1 (1989): 67. http://dx.doi.org/10.1071/sr9890067.

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The relationship between Si in soil solution and allophane and halloysite content was studied by using a drainage sequence of three New Zealand soils from rhyolitic volcanic alluvium. Clay mineralogy was compared with soil colour and drainage. Allophane and halloysite contents of two morphologically similar soils from rhyolitic volcanic ash were also studied and possible reasons for differences in mineralogy were determined. Allophane was estimated by acid oxalate and pyrophosphate dissolution. The Al/Si ratio of the allophane was determined and the allophane content of the soil was estimated

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Singh, Jagrati, S. Saggar, D. L. Giltrap, and Nanthi S. Bolan. "Decomposition of dicyandiamide (DCD) in three contrasting soils and its effect on nitrous oxide emission, soil respiratory activity, and microbial biomass—an incubation study." Soil Research 46, no. 7 (2008): 517. http://dx.doi.org/10.1071/sr07204.

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The objective of this work was to study the degradation kinetics of a nitrification inhibitor (NI), dicyandiamide (DCD), and evaluate its effectiveness in reducing nitrous oxide (N2O) emissions in different types of soils. Three soils contrasting in texture, mineralogy, and organic carbon (C) content were incubated alone (control) or with urine at 600 mg N/kg soil with 3 levels of DCD (0, 10, and 20 mg/kg). Emissions of N2O and carbon dioxide (CO2) were measured during the 58-day incubation. Simultaneously, subsamples were collected periodically from the incubating soils (40-day incubation) an

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Rois, Ibnu, Pranoto Pranoto, and Sunarto Sunarto. "APLIKASI ALOFAN DALAM TANAH ANDISOL SEBAGAI ADSORBEN UNTUK MENURUNKAN BAKTERI Coliform LIMBAH CAIR DOMESTIK." EnviroScienteae 14, no. 2 (2018): 99. http://dx.doi.org/10.20527/es.v14i2.5475.

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Research on allophane has been done as an adsorbent to decrease MPN Coliform in domestic wastewater. The purpose of this study was to look for natural adsorbent materials that can be used to decrease MPN Coliform. Natural allophane was identified from andisol soil by pH analysis of NaF, FTIR, XRD, and SAA. The result of the analysis showed that there was allophane on andisol soil with pH 11,73. The diameter of empty space or alloy pores of 5 nm with a hole/pore size of 0.5 nm. Testing of MPN Coliform is done by method of Most Probable Number (MPN) variety 5: 5: 5. Based on the result of the re

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He, N., T. L. Barr, and J. Klinowski. "ESCA and solid-state NMR studies of allophane." Clay Minerals 30, no. 3 (1995): 201–9. http://dx.doi.org/10.1180/claymin.1995.030.3.04.

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AbstractThe surface/near-surface chemistry of allophane has been studied by X-ray photoelectron spectroscopy (ESCA) and the bulk material by 27A1 and 29Si solid-state NMR and other techniques. The surface/near-surface Si/Al ratio of allophane is c.1.0, similar to that for kaolinite, zeolite Na-A and sodalite. The core level binding energies for kaolinite and allophane are almost identical, but quite different from those for zeolite Na-A and sodalite, both framework aluminosilicates. The nature and size of these differences is consistent with the differences between the chemistry of sheet and f

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Hashizume, H., and B. K. G. Theng. "Adsorption of DL-alanine by allophane: effect of pH and unit particle aggregation." Clay Minerals 34, no. 2 (1999): 233–38. http://dx.doi.org/10.1180/000985599546190.

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AbstractThe adsorption of DL-alanine at pH 4, 6 and 8 by a soil allophane has been determined. Two sets of experiments were carried out: (1) in which the allophane had been kept in a moist state throughout; and (2) in which the mineral had previously been dried at 50°C. In both instances, the adsorption isotherms showed three distinct regions as the concentration of alanine in solution was increased: (1) an initial, nearly linear, rise at low equilibrium concentrations; (2) a levelling off to a plateau at intermediate concentrations; and (3) a steep linear increase at high concentrations. For

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Cichota, R., I. Vogeler, N. S. Bolan, and B. E. Clothier. "Cation influence on sulfate leaching in allophanic soils." Soil Research 45, no. 1 (2007): 49. http://dx.doi.org/10.1071/sr06070.

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We have examined the influence of the ionic composition of the soil solution on the movement of sulfate and calcium in 2 New Zealand soils with differing allophane content. For this study, we have carried out a series of miscible displacement experiments using repacked and intact soil columns, in which sulfate was applied in the presence of either calcium or potassium as the accompanying cation. Our results showed that sulfate leaching was significantly retarded in the soil with higher allophane content when applied with calcium. On the other hand, no effects were observed for all studied soil

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Silva-Yumi, Jorge, Roberto Cazorla Martínez, Carlos Medina Serrano, and Gabriela Chango Lescano. "Allophane, a natural nanoparticle present in andisols of equatorial Ecuador, properties and applications." Characterization and Application of Nanomaterials 5, no. 1 (2022): 89. http://dx.doi.org/10.24294/can.v5i1.1689.

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Allophane is a natural nanoparticle present in soils of volcanic origin such as andisols, which are distributed around the world in countries with volcanic activity. In Ecuador, andisols constitute 30% of the territory in high and humid areas of the northern highlands. Allophane can be obtained from andisols through physical and chemical processes, or it can be synthesized. This nanomaterial has multiple properties for various applications in different areas. There is a lot of research on these nanoparticles and this type of soils, but they have not been studied yet in Ecuador. In this article

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Hojamberdiev, Mirabbos, Yuki Makinose, Kenichi Katsumata, Toshihiro Isobe, Nobuhiro Matsushita, and Kiyoshi Okada. "Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activity of Allophane – Wakefieldite-(Ce) Composite." Advanced Materials Research 896 (February 2014): 545–48. http://dx.doi.org/10.4028/www.scientific.net/amr.896.545.

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In this study, highly adsorptive mechanically-mixed and as-synthesized allophane–wakefieldite-(Ce) composites were prepared by mechanical mixing and hydrothermal synthesis, respectively. The results from X-ray diffraction and Raman spectroscopy analyses show that the mechanically-mixed composite has higher crystallinity than the as-synthesized composite. The nanoparticles of wakefieldite-(Ce) were homogenously distributed with allophane in the as-synthesized composite. The specific surface areas of the mechanically-mixed and as-synthesized composites are 164 m2/g and 191 m2/g, respectively. Th

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Calabi Floody, M., B. K. G. Theng, P. Reyes, and M. L. Mora. "Natural nanoclays: applications and future trends – a Chilean perspective." Clay Minerals 44, no. 2 (2009): 161–76. http://dx.doi.org/10.1180/claymin.2009.044.2.161.

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AbstractBecause of their large potential for agricultural, industrial and medicinal applications, nanomaterials have been the focus of much research during the past few decades. Nanoclays are natural nanomaterials that occur in the clay fraction of soil, among which montmorillonite and allophane are the most important species. Montmorillonite is a crystalline hydrous phyllosilicate (layer silicate). Organically-modified montmorillonites or ‘organoclays’, formed by intercalation of quaternary ammonium cations, have long been used as rheological modifiers and additives in paints, inks, greases a

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Nakayama, Chieko, and Yoshinori Tanaka. "Adsorption of nitrate as a groundwater pollutant by soil particles." Journal of Nepal Geological Society 34 (October 9, 2006): 141–46. http://dx.doi.org/10.3126/jngs.v34i0.31890.

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This study discusses nitrogen adsorption in several soil samples of the Kanto loam collected from two locations in the Kanto plain. Their chemical properties were assessed on each of the soil samples as well as on pure allophane clay by instrumental analysis using batch and soil column tests. Nitrogen-nitrate adsorption by soil samples was determined by a 10-hour batch test using a nitric acid solution of 0.14 mmol. A saturation column test was conducted to obtain a breakthrough curve and calculate the coefficients of dispersion and retardation. The extent of nitrate adsorption in soil s

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Baskaran, S., N. S. Bolan, A. Rahman, and R. W. Tillman. "Pesticide sorption by allophanic and non‐allophanic soils of New Zealand." New Zealand Journal of Agricultural Research 39, no. 2 (1996): 297–310. http://dx.doi.org/10.1080/00288233.1996.9513189.

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Parfitt, RL. "Allophane in New Zealand - a review." Soil Research 28, no. 3 (1990): 343. http://dx.doi.org/10.1071/sr9900343.

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Studies of allophanes from New Zealand are reviewed, and a definition of the allophane group of minerals is suggested. Three types of allophane are identified, and their structures are discussed under headings Al-rich soil allophanes, Si-rich soil allophanes and stream deposit allophanes. Examples from New Zealand soils and tephras are discussed in relation to properties, identification and weathering processes.

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Childs, C. W., K. Inoue, H. Seyama, M. Soma, B. K. G. Theng, and G. Yuan. "X-ray photoelectron spectroscopic characterization of Silica Springs allophane." Clay Minerals 32, no. 4 (1997): 565–72. http://dx.doi.org/10.1180/claymin.1997.032.4.07.

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AbstractA range of allophane samples (atomic AI/Si bulk ratios 1.1-1.9) from Silica Springs, New Zealand, has been characterized by X-ray photoelectron spectroscopy (XPS). Binding energies of Si 2s, Si 2p, Al 2p, O 1s, C 1s, and N 1s electrons, together with the kinetic energies of Al KL23L23 Auger electrons, at or near the surface of allophane aggregates, have been derived. The values for Al, Si and O electrons are similar to those for kaolinite but also to those for some framework silicates (feldspars) having 4-coordinate Al. Values for N electrons suggest that N occurs in organic structures

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Ohashi, F., S. I. Wada, M. Suzuki, M. Maeda, and S. Tomura. "Synthetic allophane from highconcentration solutions: nanoengineering of the porous solid." Clay Minerals 37, no. 3 (2002): 451–56. http://dx.doi.org/10.1180/0009855023730052.

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AbstractThe amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10 – 100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorphous structure with a particle diameter of 3 – 5 nm. The amorphous products had a high BET specific surface area (490 – 552 m2/g) in comparison with natural allophane and had a narrow pore-size distribution (2 – 5 nm in diameter). The results of water vapour adsorption isotherm stu

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Duwig, C., B. Prado, A. J. Tinet, et al. "Impacts of land use on hydrodynamic properties and pore architecture of volcanic soils from the Mexican Highlands." Soil Research 57, no. 6 (2019): 629. http://dx.doi.org/10.1071/sr18271.

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Volcanic soils are important resources because of their unique mineralogical and physical characteristics, and allophanic Andosols represent some of the world’s most fertile soils. However, their unique properties can be lost when cultivated. Most soils in the Central Valley, Mexico, are derived from volcanic materials. This valley encompasses one of the largest water supply systems in the world by volume, but is affected by soil degradation and deforestation. Sustainably managing volcanic soils requires understanding how land use affects their hydrodynamic properties. Gas adsorption and mercu

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Addison, B., M. Boyes, and P. L. Singleton. "Differences in particle density between field-moist and oven-dry samples from Allophanic Soils." Soil Research 37, no. 5 (1999): 965. http://dx.doi.org/10.1071/sr98116.

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Particle density is used to calculate total soil porosity and related measurements such as macroporosity and water storage capacity. Methods for measuring particle density often advise using dry samples. This study measured particle density by displacement of water using both field-moist and oven-dry samples from 4 New Zealand Allophanic Soils. There were significant differences in particle density between the 2 methods. Oven-dry samples under-estimated particle density by up to 0.33 Mg/m 3 and as a result, calculations of porosity were under-estimated by up to 0.05 m 3/m 3 . Under-estimation

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Liu, Q., P. Loganathan, M. J. Hedley, and M. F. Skinner. "Root processes influencing phosphorus availability in volcanic soils under young Pinus radiata plantations." Canadian Journal of Forest Research 36, no. 8 (2006): 1913–20. http://dx.doi.org/10.1139/x06-083.

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Phosphorus (P) availability was investigated in rhizosphere soils under 4- to 5-year-old, second-rotation Pinus radiata D. Don and understorey grass (browntop, Agrostis capillaris L.) in two P-deficient Andosols (a Pumice Soil and an Allophanic Soil). Pinus radiata rhizosphere had more soil organic matter, greater mycorrhizal hyphal length density, higher acid phosphatase activity, and more concentrated dissolved organic carbon than bulk soil or the rhizosphere of grass species in one or both soils. Concentrations of resin P and organic P in the P. radiata rhizosphere were higher than those in

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Hashimoto, Yohey, Jihoon Kang, Nobuhiko Matsuyama, and Masahiko Saigusa. "Path Analysis of Phosphorus Retention Capacity in Allophanic and Non-allophanic Andisols." Soil Science Society of America Journal 76, no. 2 (2012): 441–48. http://dx.doi.org/10.2136/sssaj2011.0196.

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Ito, Kiyoshi, Tadashi Takahashi, and Masami Nanzyo. "Aluminum toxicity of synthetic aluminum–humus complexes derived from non-allophanic and allophanic Andosols and its amelioration with allophanic materials." Soil Science and Plant Nutrition 55, no. 1 (2009): 35–41. http://dx.doi.org/10.1111/j.1747-0765.2008.00328.x.

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Calderon, Edward H. Jiménez, Marco Rosero, and Magdalena Diaz. "Use of Allophane as Face Mask Filter for Coronaviruses (Sars-Cov-2)." Key Engineering Materials 878 (March 2021): 62–72. http://dx.doi.org/10.4028/www.scientific.net/kem.878.62.

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The traditional mouth cover masks can be made by hand. But with the arrival of the Coronavirus pandemic, these masks have special requirements and we will have to use these until at least 2022. Therefore, the current technological problem is what must be the appropriate filter nanomaterial (cuprum, zinc, zeolite or Allophane) to absorb and/or destroy coronaviruses. In addition, the preparation of this specific purpose mask must be certified, easy to manufacture and inexpensive. Taking these requirements into account, there is a suitable nanomaterial called Allophane, which has active centers o

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Taylor, T. S., J. C. Hughes, and L. W. Titshall. "Mineralogy of volcanically derived alluvial soils at Moshi, Tanzania." Soil Research 54, no. 8 (2016): 926. http://dx.doi.org/10.1071/sr15252.

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Despite intensive commercial agriculture in the rift zone of Tanzania, mineralogical studies on the soils influenced by volcanic parent materials are scarce. A mineralogical investigation of the soils and two buried ash layers from an irrigated sugar estate was undertaken using X-ray diffraction, transmission electron microscopy and measurements of extractable iron, aluminium and silicon and the specific surface area (SSA) of the clay fraction. The dominant mineral in the sand and silt fractions was sanidine. The clay fractions contained mainly high-defect kaolin, illite and K-feldspar, with s

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Jiménez Calderón, Edward Henry, Ana Emperatriz Paucar Tipantuña, Paulina Fernanda Herrera Mullo, et al. "Natural and Activated Allophane Catalytic Activity Based on the Microactivity Test in Astm Norm 3907/D3907M-2019." Applied Sciences 10, no. 9 (2020): 3035. http://dx.doi.org/10.3390/app10093035.

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The optimal conditions of the catalytic activation of allophane were evaluated for possible use as a catalyst within a fluidized bed catalytic cracking unit (FCC). The physicochemical properties of natural allophane and activated allophane were studied by using an alkaline activating agent, followed by a hydrothermal treatment. For the characterization, analytical techniques were used: Fourier transform infrared spectroscopy, particle size, (BET) surface area, thermogravimetry (TGA), X-ray diffraction (XRD), chemisorption, X-ray fluorescence (XRF), atomic force microscopy (AFM), and chromatogr

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Cardinale, Anna Maria, Cristina Carbone, Marco Fortunato, Bruno Fabiano, and Andrea Pietro Reverberi. "ZnAl-SO4 Layered Double Hydroxide and Allophane for Cr(VI), Cu(II) and Fe(III) Adsorption in Wastewater: Structure Comparison and Synergistic Effects." Materials 15, no. 19 (2022): 6887. http://dx.doi.org/10.3390/ma15196887.

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Owing to their structure, layered double hydroxides (LDHs) and allophane are nowadays considered as promising materials for application in different fields. The goal of this work is to compare the efficacy of allophane and ZnAl-SO4 LDH to remove, by adsorption, some cationic and anionic pollutants from industrial wastewater. Both compounds were synthesized via the co-precipitation route (direct method) followed by hydrothermal treatment, obtaining nanoscopic crystallites with a partially disordered turbostratic (ZnAl-SO4 LDH) or amorphous (allophane) structure. The characterization of the obta

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Wilson, M. A., S. A. McCarthy, and P. M. Fredericks. "Structure of poorly-ordered aluminosilicates." Clay Minerals 21, no. 5 (1986): 879–97. http://dx.doi.org/10.1180/claymin.1986.021.5.03.

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AbstractThe structure of synthetic aluminosilicates prepared at pH 6 has been investigated by 29Si and 27Al high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy. Fourier transform infrared (FTIR) spectroscopy and electron microscopy have also been used to characterize the products. The amount of Si and Al in protoimogolite, disordered allophane and other structures has been measured. There is a fair correlation between the intensity of the 349 cm−1 band in the FTIR spectra and the proportion by weight of protoimogolite Si measured by NMR. It is shown that disordered alloph

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Schwertmann, U., J. Friedl, H. Stanjek, and D. G. Schulze. "The effect of clay minerals on the formation of goethite and hematite from ferrihydrite after 16 years’ ageing at 25°C and pH 4 – 7." Clay Minerals 35, no. 4 (2000): 613–23. http://dx.doi.org/10.1180/000985500547034.

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AbstractIn soils and other weathering environments, hematite and goethite are usually formed in the presence of clay minerals. Two-line ferrihydrite was aged in the presence of six different clay minerals in aqueous suspension at 25°C and pH 4, 5, 6 and 7 for 16 years. The transformation into hematite/goethite mixtures was complete in the systems with gibbsite, kaolinite, illite and smectite, but incomplete in those with soil smectite and allophane. Soil smectite and allophane, as well as increasing pH, favoured hematite over goethite. The grainy and multi-domainic hematite crystals in the all

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Pranoto, Pranoto, Tri Martini, and Deta Agustin Rachmawati. "Karakterisasi dan Uji Efektivitas Allophane-Like untuk Adsorpsi Ion Logam Tembaga (Cu)." ALCHEMY Jurnal Penelitian Kimia 14, no. 2 (2018): 202. http://dx.doi.org/10.20961/alchemy.14.2.18538.202-218.

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<p>Telah dilakukan penelitian karakterisasi dan uji efektivitas <em>allophane-like</em> untuk adsorpsi ion logam tembaga (Cu). <em>Allophane-like</em> dibuat dengan mencampurkan larutan <em>Tetraethyl Orthosilicate</em> (TEOS) dan <em>Aluminum Nitrate Nonahydrate</em> [Al(NO<sub>3</sub>)<sub>3</sub>.9H<sub>2</sub>O] dengan perbandingan 0,5; 0,75; 1; 1,25 dan 1,5. Proses pencampuran dilakukan penambahan NaOH secara bertahap dan dilakukan pengadukan serta pemanasan. Penambahan NaOH dilakukan dengan membuat

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Nishikiori, Hiromasa, Shingo Matsunaga, Naoyuki Furuichi, et al. "Influence of allophane distribution on photocatalytic activity of allophane–titania composite films." Applied Clay Science 146 (September 2017): 43–49. http://dx.doi.org/10.1016/j.clay.2017.05.026.

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Oh, Young-Mi, Paul V. Nelson, and Dean L. Hesterberg. "256 Evaluation of Phosphate Desorption Characteristics of Clay Minerals for Soilless Root Media." HortScience 34, no. 3 (1999): 486C—486. http://dx.doi.org/10.21273/hortsci.34.3.486c.

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Soilless root media retain very little phosphate. This characteristic necessitates continual application of phosphate, which leads to excessive application and leaching. The phosphate desorption characteristics of synthetic hematite (a-Fe2O3), goethite (a-FeOOH), allophane (Si3Al4O12*nH2O), and a commercial alumina (Al2O3), previously determined for their maximum adsorption capacities, were evaluated to determine their potential for providing a low, constant soil solution phosphate supply with low phosphate leaching from soilless root media. The desorption isotherms of the clay minerals were o

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Takahashi, J., and T. Higashi. "Sulphate retention: a simplified method for categorizing soils into allophanic and non-allophanic Andosols." European Journal of Soil Science 66, no. 1 (2014): 65–73. http://dx.doi.org/10.1111/ejss.12211.

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