Comparison of Silica Sand Properties from Kandal Province, Cambodia and Tapah, Perak, Malaysia and Characterization of Soda Lime Silicate Glass Produced From Cambodian Silica Sand

Silica sand from Kandal province, Cambodia and Tapah Perak, Malaysia was grounded into an average micron size of 128.12 and 132.68µm. Both sands were characterized by X-ray fluorescence (XRF), X-ray Diffraction, particle Size Analysis, Differential Thermal Analysis and Thermogravimetric Analysis (DTA/TGA). Malaysian silica sand was designated SDMTP and Cambodian Silica sand as SDCK. From theanalysis, XRF showed that the major impurities in SDMTP were Al2O3, K2O and TiO2. On the other hand, SDCK had impurities of Al2O3,K2O and Na2O. DTA results from SDMTP and SDCK showedthere is an endothermic peak occurring at 572°C which can be attributed to β-quartz transformation into α-quartz. TGA for SDMTP showed that maximum weight lost was at 441°C with a weight percent (wt%) change of 0.48%. The TGA for SDCK showed a wt% change of 1.298% at temperature of 1000°C. From XRD analysis, the main phase of SDCK and SDMTP were quartz. The impurities of both sands play an important role in determining the optical and mechanical properties of the soda lime silicate (SLS) glass formed. Particle size of silica sand affects the mechanical properties such as compression, hardness, and transmittance of SLS glass. The smaller particle size would be ideal choice for glassmaking. Melting temperature, soaking time, and melt accelerant can also affect the mechanical properties of SLS glass. The best result obtained for Vickers hardness in this study was the SLS glass sample designated as Run No 12 with a value of 525.02 kg.mm-2. It had a particle size range from 500-600µm, a furnace soaking time of 4 hours at a melting temperature of 1500°C with 1.0 wt% of Sodium Chloride (NaCl) as meltingaccelerant. On the other hand, the highest compressive strength of 356.22 MPa was found in sample designated as Run No 1. It had a particle size range from 75-1800µm, a soaking time of 5 hours at a melting temperature of 1550°C with 0.5 wt% of NaCl. Lastly,the highest UV-VIS transmittance at 520 nm was obtained from sample designated as Run No 5 within the value of 84.26 %Transmittance (T). It had a particle size range of 75-1800µm, soaking time of 3 hours at a melting temperature of 1550°C with 1.5 wt% of NaCl. .

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Nickel Wick by Continuous Freeze-Casting: Influences of the Particle Size on the Capillarity and Mechanical Properties

Materials ◽

10.3390/ma14154340 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4340

Author(s):

Pedro Javier Lloreda-Jurado ◽

Laura Chicote ◽

Ernesto Chicardi ◽

Ranier Sepúlveda

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Size Range ◽

Casting Process ◽

Freeze Casting ◽

Particle Size Range ◽

Particle Sedimentation ◽

Average Pore ◽

Pore Sizes ◽

Interconnected Pore

The aim of this work was to study the effect of the particle size range, the freeze casting temperature and sintering temperature on the capillarity performance and mechanical properties of Ni wicks manufactured by freeze-casting. The use of Ni/camphene-polystyrene suspensions creates wicks with an open porosity above 80% and average pore sizes of 38 μm to 17 μm by tailoring the particle size ranges and freezing temperatures employed. The incorporation of PS and the use of a continuous freeze-casting process reduces the particle sedimentation and generates a highly interconnected pore structure with regular pore sizes across the sample. The capillarity performances exhibit a fast and complete water adsorption, especially in Ni wicks freeze-casted at 10 °C and sintered at 800 °C, but only when the smaller particle size range is used do Ni wicks achieve sufficient mechanical strength.

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Application of mineral magnetism to describe profile development of toposequences of a sedimentary soil in south-eastern Australia

Soil Research ◽

10.1071/sr00077 ◽

2001 ◽

Vol 39 (5) ◽

pp. 927 ◽

Cited By ~ 9

Author(s):

R. H. Crockford ◽

I. R. Willett

Keyword(s):

Particle Size ◽

Grain Size ◽

Magnetic Susceptibility ◽

Magnetic Particles ◽

Size Range ◽

The Other ◽

Particle Sizes ◽

Mineral Magnetism ◽

Particle Size Range ◽

Eastern Australia

Mineral magnetism and chemical properties of soil profiles across a valley with an erosion gully in a Yellow Dermosol sedimentary soil suggest that the magnetic profile resulted from a combination of alluviation and pedogenesis. The concentration of soil magnetic minerals in a range of particle sizes (3.36–2 mm to <2 μm) diminished from the surface downwards to a minimum (referred to as layer P), then increased to high values (layer H), after which it decreased to bed rock level at the base layer. It is proposed that the H layer was the surface of a buried soil, and that the ferrimagnetic mineral through the profiles was dominantly maghemite, formed by fire enhancement. The magnetic pattern of the profiles compressed as the soil became shallower up-slope, from 3 m in depth at the lowest site to 0.7 m at a site 40 m up-slope. Above this site the high susceptibility H layer was absent, which is consistent with the H layer being an earlier soil surface. Except for the profile at the very top of the slope (depth of 0.63 m), the magnetic grain size did not vary with depth. In the P layers, there was a greater proportion of paramagnetic minerals than in the other layers. The changes in magnetic susceptibility through the profiles were influenced by ferrimagnetic, paramagnetic, and canted anti-ferromagnetic material. For all depths in all profiles the magnetic susceptibility changed consistently through the particle size range, decreasing from the larger sizes to the 10–20 m size then increasing slightly to the smallest size (<2 μm). The mean magnetic grain size also decreased through the particle size range. Magnetic particles of 3 concentration levels were extracted by a hand magnet from the 4 largest particle sizes and showed the same magnetic-particle size relationships, for both mass susceptibility and magnetic grain size, as the other particle sizes. This showed that the proportion of highly magnetic particles effectively determined the susceptibility and magnetic grain size features of the bulk samples of each particle size class. The particle size/magnetic susceptibility pattern described in this paper occurs in all sedimentary soils and derived river sediments studied in this part of Australia. However, soils and sediments of granitic origin have an inverse pattern. These differences are attributed to pedogenic and geomorphological process. The difficulties in using mineral magnetic properties as a means of sourcing mobile sediments in catchments are discussed.

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Comparative Analysis of Compositions between Calcium Phosphate Calculi and Urinary Crystallites in the Stone-Formers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.881-883.457 ◽

2014 ◽

Vol 881-883 ◽

pp. 457-460 ◽

Cited By ~ 2

Author(s):

Wen Yu Zhu ◽

Meng Xu ◽

Feng Xin Wang ◽

Jian Ming Ouyang

Keyword(s):

Particle Size ◽

Uric Acid ◽

Calcium Phosphate ◽

Healthy Subjects ◽

Size Range ◽

Calcium Oxalate Monohydrate ◽

Particle Size Range ◽

X Ray ◽

Stone Formers ◽

Main Components

The chemical composition of urinary crystallites of less than 1000 nm from 10 calcium phosphate (CaP) stone-formers were investigated and compared with that from healthy subjects using X-ray power diffraction, Fourier transform infrared spectroscopy and nanoparticle size analyzer. Although there were some calcium oxalate monohydrate (COM) crystals in CaP stones, the main components of crystallites in urine of CaP stone formers were uric acid (UA), CaP and COM, while that in healthy urine was mainly UA and a small amount of COM. That is, the CaP content in urinary crystallites of CaP stone-formers was significantly higher than that of controls. The particle size range of crystallites in lithogenic urine was 3~1000 nm and most of these crystallites were aggregated, but it was 30~500 nm in healthy subjects.

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128 Release of Zinc from Shredded Waste Tires Designed for Use as a Substrate Amendment

HortScience ◽

10.21273/hortsci.34.3.463e ◽

1999 ◽

Vol 34 (3) ◽

pp. 463E-463

Author(s):

Amy Dallman ◽

H. Taber ◽

M. Evans ◽

D. Shogren

Keyword(s):

Particle Size ◽

Size Range ◽

Distilled Water ◽

Particle Size Range ◽

Soaking Time ◽

Waste Tires ◽

Substrate Amendment ◽

Coarse Material ◽

Rubber Particles ◽

Potential Component

Shredded rubber from automotive waste tires has been proposed as a potential component for use as a potting root substrate. One of the problems with using shredded rubber as a root substrate is that it releases potentially phytotoxic levels of Zn. Therefore, we were interested in washing the rubber particles with either distilled water, 0.1N HCl, or 0.05N DTPA before inclusion of the rubber in the potting mix. A coarse and a fine grade were used. Seventy-two percent (% w/w) of the particles in the coarse grade were within a particle size range of 2.8-6.3 mm, while only 52% of the particles in the fine grade were within this range. The ratio of extractant to shredded rubber was 2:1 (v/v). The soaking time varied from 1 to 96 hours with the extractant changed every 1, 2, 12, or 24 hours. For either particle size, the 0.1N HCl extractant removed 25 times more Zn than the water and 1.5 times more than the DTPA. With the 0.1N HCl extractant, three times more Zn was removed from the fine rubber as compared with the coarse material. Seventy-five percent of the Zn extracted was removed in the first hour of soaking and 92% removed within 72 hours.

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Synthesis of Oxide Ceramic Powders by Aqueous Coprecipitation

MRS Proceedings ◽

10.1557/proc-73-117 ◽

1986 ◽

Vol 73 ◽

Cited By ~ 5

Author(s):

J. R. Moyer ◽

A. R. Prunier ◽

N. N. Hughes ◽

R. C. Winterton

Keyword(s):

Particle Size ◽

Surface Area ◽

Size Range ◽

Oxide Ceramic ◽

Ceramic Powders ◽

Particle Size Range ◽

X Ray ◽

Computer Controlled ◽

Precursor Powders

ABSTRACTAqueous precipitation in a computer-controlled continuous crystallizer has been applied to the preparation of cordierite, mullite, alumina, and zirconia precursor powders. The particles are dense, spherical, and x-ray amorphous. The powders have a particle size range of 0.2–5 μm and a surface area of 1 – 10 m2/g The properties of the powders and of some green and fired pieces are described.

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