A Crystalline Hydrated Magnesium Silicate formed in the Breakdown of a Concrete Sea-wall

Nature ◽  
1953 ◽  
Vol 171 (4347) ◽  
pp. 354-355 ◽  
Author(s):  
W. F. COLE
Keyword(s):  
Magnesium Silicate ◽  
Hydrated Magnesium Silicate ◽  
Sea Wall

scholarly journals Low-Cost Investment with High Quality Performance. Bleaching Earths for Phosphorus Reduction in the Low-Temperature Bleaching Process of Rapeseed Oil

Foods ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 603 ◽  
Author(s):  
Barbara Łaska-Zieja ◽  
Damian Marcinkowski ◽  
Wojciech Golimowski ◽  
Gniewko Niedbała ◽  
Ewelina Wojciechowska
Keyword(s):  
Low Temperature ◽  
Rapeseed Oil ◽  
Low Cost ◽  
Magnesium Silicate ◽  
Industrial Plant ◽  
Bleaching Process ◽  
Low Efficiency ◽  
Hydrated Magnesium Silicate ◽  
Cold Pressed ◽  
Phosphorus Reduction

Rapeseed oils are a valuable component of the diet. Mostly, there are refined oils deprived of valuable nutrients in the market, hence in recent times cold-pressed and unrefined oils have been available and popular among consumers. However, the low yield of this oil makes this product expensive. The aim of the study was to analyse the effectiveness of phosphorus reduction in crude oils, cold- and hot-pressed in the low-temperature bleaching process. Eight market-available bleaching earths was compared. The effectiveness of 90% was found with 2% (m/m) of Kerolite with hydrated magnesium silicate. An increase in the share of earths to 4% (m/m) resulted in the effectiveness of phosphorus reduction >90% in seven out of eight analysed cases. Bentonite activated with acid with the lowest MgO content was characterised by low efficiency <64%. The research shows that the effectiveness of phosphorus reduction was significantly affected by the composition of earths applied in the bleaching process at ambient temperature. The results of research confirm the high effectiveness of the process as it is not necessary to heat up the oil before the bleaching process. This method is recommended for existing and new industrial plant for two-stage rapeseed oil pressing.

Spatial distribution and content detection of gefitinib in tablets using confocal micro-raman spectroscopy mapping

2020 ◽  
Vol 10 (9) ◽  
pp. 1444-1451
Author(s):  
Li Ma ◽  
Chun-Hua Zhou ◽  
Bo Yang ◽  
Xu Han ◽  
Ying-Chun Cui
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Distribution ◽  
Magnesium Silicate ◽  
Accurate Identification ◽  
Scanning Method ◽  
Live Video ◽  
Video Imaging ◽  
Micro Raman Spectroscopy ◽  
Spectral Bands ◽  
Hydrated Magnesium Silicate

In this study, we aim at establishing a method to evaluate the spatial distribution and content of gefitinib in tablets without destroying the tablets. The content of gefitinib tablets was determined by HPLC. Using confocal micro-Raman spectroscopy, with a wavelength of 785 nm and power of 10%, gefitinib, starch, and hydrated magnesium silicate were scanned. Tablets with five concentrations of gefitinib (15.63–31.25%) were scanned with a 1000 × 1000 μm spectral resolution and live video imaging was performed. The surfaces of gefitinib tablets were scanned and images were obtained by a continuous scanning method. Characteristic Raman spectra of tablets were obtained after surface scanning and map reviews of tablets with five concentrations of gefitinib for rapid and accurate identification. The characteristic spectral bands of gefitinib, starch, and hydrated magnesium silicate were 1620 cm–1, 480 cm–1, 1350 cm–1 respectively. Comparing the surfaces of the tablets, it was found that the tablets with a flat and round surface are more suitable for Raman spectroscopy. Live video imaging and scanning maps of five concentrations of gefitinib were performed. The results showed that the product with the content of 16.12% had a good mixing homogeneity. In conclusion, confocal micro-Raman spectroscopy can detect the spatial distribution and content of gefitinib tablets without destroying tablets.

Effect of Moisture on Chromatographic Properties of Synthetic Hydrated Magnesium Silicate

1952 ◽  
Vol 24 (10) ◽  
pp. 1670-1671 ◽  
Author(s):  
M. L. Wolfrom ◽  
Alva Thompson ◽  
T. T. Galkowski ◽  
E. J. Quinn
Keyword(s):  
Magnesium Silicate ◽  
Effect Of Moisture ◽  
Hydrated Magnesium Silicate

Synthetic ‘deweylite’

1971 ◽  
Vol 38 (294) ◽  
pp. 225-234 ◽  
Author(s):  
K. Speakman ◽  
A. J. Majumdar
Keyword(s):  
Cement Hydration ◽  
Magnesium Silicate ◽  
Silica Gels ◽  
Hydration Products ◽  
Silicate Mineral ◽  
X Ray ◽  
Synthetic Materials ◽  
Infra Red ◽  
Magnesium Silicates ◽  
Hydrated Magnesium Silicate

SummaryMaterials similar to the natural hydrated magnesium silicate mineral deweylite have been synthesized hydrothermally under low-temperature-low-pressure conditions from magnesia-silica gels. Optical, X-ray, infra-red, and DTA examinations have shown that both the natural and synthetic materials are mixtures of badly crystallized talc and badly crystallized serpentine. The mineral is thought to be a coarse mixture of these two components while the synthetic products are intimately interlayered. These materials are believed to be closely related to the hydrated magnesium silicates detected in high-magnesia cement hydration products.

scholarly journals Optimization And Validation Of Hydrated Magnesium Silicate On Dry Washing Purification Biodiesel Using Response Surface Methodology

2019 ◽  
Vol 158 ◽  
pp. 333-338 ◽  
Author(s):  
Bayu Rudiyanto ◽  
Muhamad Andrianto ◽  
Yuana Susmiati ◽  
Nugroho Agung Pambudi ◽  
Riyanto
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Magnesium Silicate ◽  
Hydrated Magnesium Silicate

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

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