A New Compound Phosphate Heat-Cured Foundry Binder

2010 ◽  
Vol 97-101 ◽  
pp. 979-982 ◽  
Author(s):  
Lu Xia ◽  
You Shou Zhang ◽  
Jin Huang
Keyword(s):  
Phosphoric Acid ◽  
Aluminum Hydroxide ◽  
Storage Stability ◽  
Physicochemical Characteristics ◽  
Inorganic Materials ◽  
Combined Effect ◽  
Sand Mold ◽  
Gas Evolution ◽  
Environmental Friendly ◽  
Laboratory Results

Influences of additives on the physicochemical characteristics and technologies of binder are researched, and a new compound phosphate heat-cured foundry binder coded B8M15 is developed. The binder is made from environmental friendly inorganic materials such as phosphoric acid, aluminum hydroxide, B-ion additive and Mg-ion additive. Laboratory results indicate that combined effect of B-ion additive and Mg-ion additive can improve the storage stability of the binder and its sand mold or core, as well as they can increase the dry strength of its sand mold or core from 0.77MPa to 2.51MPa. This binder has low gas evolution and good collapsibility.

scholarly journals Technosols Development in an Abandoned Mining Area and Environmental Risk Assessment

2021 ◽  
Vol 11 (15) ◽  
pp. 6982
Author(s):  
Chiara Ferronato ◽  
Gilmo Vianello ◽  
Mauro De Feudis ◽  
Livia Vittori Antisari
Keyword(s):  
Central Italy ◽  
Organic Matter Content ◽  
Chemical Properties ◽  
Soil Surface ◽  
Mining Area ◽  
Physicochemical Characteristics ◽  
Matter Content ◽  
Mine Tailing ◽  
Inorganic Materials ◽  
Soil Features

The study of Technosols development, spatial distribution and physicochemical characteristics is becoming more and more important in the Anthropocene Era. The aim of the present study was to assess soil features and potential heavy metal release risk of soils developed on different mine tailing types after the waste disposal derived from mining activity in Central Italy. Soils were analyzed for their morphological, physical and chemical properties, and a chemical sequential extraction of heavy metals was performed. The investigated soils were classified as Technosols toxic having in some layer within 50 cm of the soil surface inorganic materials with high concentrations of toxic elements. Our findings showed that the bioavailability of potentially toxic element concentrations in the soil changed according to the origin of the mine tailing. However, because of the acidic pH, there is a serious risk of metals leaching which was reduced where the soil organic matter content was higher.

scholarly journals Potentially Synbiotic Grape Juice: What is the Impact of The Addition of Lacticaseibacillus casei and Prebiotic Components?

2020 ◽  
Vol 11 (3) ◽  
pp. 10703-10715
Keyword(s):  
Storage Stability ◽  
Grape Juice ◽  
Physicochemical Characteristics ◽  
Quality Parameters ◽  
Sensory Acceptance ◽  
Texture Properties ◽  
Hedonic Scale ◽  
Grape Juices ◽  
The Impact ◽  
And Storage

The objective of this study was to evaluate the impact of the addition of oligofructose or polydextrose (2 g/100 g) and Lacticaseibacillus casei (2 g/L) on the quality parameters of grape juices during storage (7 oC/28 days in polyethylene terephthalate flasks). The addition of probiotics or prebiotics did not alter the physicochemical characteristics, texture properties, and storage stability of the grape juices; however, they changed the color and/or turbidity. Oligofructose and polydextrose did not show a protective effect on the probiotic, but the products showed probiotic viability higher than 106 CFU/mL. The grape juice with oligofructose had similar acceptance to the control juice. The addition of polydextrose or reduced probiotic acceptance in most of the evaluated attributes. All grape juices presented scores higher than 6 on a 9-point hedonic scale and an acceptability index higher than 70%. It is possible to produce potentially synbiotic grape juices with suitable quality parameters, probiotic survival, and sensory acceptance.

scholarly journals Improvement of Collapsible Soil Behavior of a Lateritic Soil Using Rice Husk Ash

2015 ◽  
Vol 668 ◽  
pp. 290-296 ◽  
Author(s):  
Luiza P. Fagundes ◽  
Jhaber D. Yacoub ◽  
Andrey C. Lima ◽  
Flávia R. Nakatsuchi ◽  
José A. Lollo ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Combined Effect ◽  
Building Construction ◽  
Lateritic Soil ◽  
Soil Behavior ◽  
Collapsible Soil ◽  
Lateritic Soils ◽  
Environmental Friendly

Great areas of Brazil present lateritic soils, such as the northeast and the south. Some of these soils have, as main characteristic, instable structures that can present considerable volumetric deformation in the presence of water. This behavior, also named collapse, is responsible for several problems on the building construction such as cracks and fractures that can damage the safety of structures. The aim of this paper is to assess the possibility of improvement of collapsible behavior of a lateritic soil using rice husk ash (RHA). A previous characterization of soil and RHA was performed in order to assess the combined effect of soil/RHA. The results are so promising, showing a new alternative to reduce the collapsible behavior of soils using an environmental friendly technology.

Essential Oils Encapsulation into Nanoliposome and Novel Application of Nanoliposome as a Storage Pesticide

2020 ◽  
Vol 62 ◽  
pp. 96-107
Author(s):  
Zahra Faraji ◽  
Jahanshir Shakarami ◽  
Jaleh Varshosaz ◽  
Shahriar Jafari
Keyword(s):  
Thin Film ◽  
Essential Oil ◽  
Essential Oils ◽  
Storage Stability ◽  
Physicochemical Characteristics ◽  
Release Profile ◽  
Mentha Pulegium ◽  
Preparation Methods ◽  
Mean Size ◽  
Fumigation Toxicity

This study attempted to evaluate the physicochemical characteristics of essential oil nanoliposomes from three plants by two preparation methods including thin film sonication and heating. Also, the durability of fumigation toxicity of the essential oil nanoliposome and pure essential oil of Mentha pulegium against Tribolium castaneum Herbst adults were compared. The smallest mean size of the nanoliposome was prepared by the thin film sonication method (P<0.05). The encapsulation efficiency of the nanoliposome was higher than 96%. Nanoliposmes prepared by using two methods showed high stability during storage. The release profile of essential oils at the heating method showed that the essential oil diffusion from the nanoliposome was in the following order: Mentha pulegium > Ferula gummosa > Zattaria multiflora. These findings indicate that both preparation methods had the same effect on the formation of nanoliposomes, their characteristics, and their storage stability. The durability of fumigation toxicity of the nanoliposome M. pulegium essential oil had a significant effect on mortality of T. castaneum adults in comparison with pure essential oil of this plant. The result showed that nanoliposome encapsulation of M. pulegium essential oil significantly increased fumigation toxicity against T. castaneum. Therefore, essential oil encapsulation into a nanoliposome carrier can potentially be used in pest management.

scholarly journals Flame Retardancy Properties and Physicochemical Characteristics of Polyurea-Based Coatings Containing Flame Retardants Based on Aluminum Hydroxide, Resorcinol Bis(Diphenyl Phosphate), and Tris Chloropropyl Phosphate

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5168
Author(s):  
Wojciech Dukarski ◽  
Piotr Krzyżanowski ◽  
Marcin Gonsior ◽  
Iwona Rykowska
Keyword(s):  
Mechanical Properties ◽  
Aluminum Hydroxide ◽  
Flame Retardancy ◽  
Flame Retardants ◽  
Oxygen Index ◽  
Good Alternative ◽  
Physicochemical Characteristics ◽  
Limiting Oxygen Index ◽  
Diphenyl Phosphate ◽  
Further Development

Polyurea is a synthetic material made by the reaction of isocyanate and polymer blend-containing amines. Due to its outstanding mechanical properties and fast curing, polyurea-based coatings have found dozens of applications, including waterproofing and anti-corrosion coatings. Further development of this material can create a flame-retardant product, a good alternative for common products available on the market, such as intumescent coatings. To improve the flame retardancy of polyurea, several flame retardants were investigated. The influence of aluminum hydroxide, resorcinol bis(diphenyl phosphate) (RDP), and tris chloropropyl phosphate (TCPP) on flame retardancy and morphology was studied. The following methods were used: infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, limiting oxygen index, and tensile strength. The examinations mentioned above showed the improvement of flame-retardancy of polyurea for two products: chlorinated organophosphate and organophosphate. Nevertheless, using the chlorinated organophosphate additive caused a rapid deterioration of mechanical properties.

Thermal stability and oil absorption of aluminum hydroxide treated by dry modification with phosphoric acid

2007 ◽  
Vol 14 (6) ◽  
pp. 779-782 ◽  
Author(s):  
Xiang-yang Zhou ◽  
Chang-lin Li ◽  
Deng-wei Huo ◽  
Jie Li ◽  
Shang-yuan Wu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Phosphoric Acid ◽  
Aluminum Hydroxide ◽  
Oil Absorption ◽  
Dry Modification

scholarly journals Selection, Preparation, and Characterization of Commutable Frozen Human Serum Pools as Potential Secondary Reference Materials for Lipid and Apolipoprotein Measurements: Study within the Framework of the Dutch Project “Calibration 2000”

2002 ◽  
Vol 48 (9) ◽  
pp. 1526-1538 ◽  
Author(s):  
Christa Cobbaert ◽  
Cas Weykamp ◽  
Henk Baadenhuijsen ◽  
Aldy Kuypers ◽  
Jan Lindemans ◽  
...  
Keyword(s):  
Human Serum ◽  
Reference Materials ◽  
Ldl Cholesterol ◽  
External Quality Assessment ◽  
Hdl Cholesterol ◽  
Physicochemical Characteristics ◽  
Field Method ◽  
External Quality ◽  
Laboratory Results

Abstract Background: The Dutch project “Calibration 2000” aims at harmonization of laboratory results via calibration by development of matrix-based secondary reference materials. We considered the selection, preparation, and characterization of 34 potential reference materials (PRMs). Methods: Sixteen PRMs were prepared either strictly according to the NCCLS C37-A protocol or in a less stringent and more convenient way. In addition, 18 commercial, so-called human serum-based calibrators or controls were purchased and tested. Lipoprotein integrity was evaluated by examining the physicochemical characteristics of the materials. Commutability of the PRMs was assessed in 86 Dutch clinical laboratories, using a multicenter split-patient-sample between-field-method (twin-study) design. Normalized residuals of the PRMs with respect to the patient regression lines were calculated; in addition, the extra contribution of each PRM to the total measurement uncertainty (CVNetto) was calculated. On the basis of these results, the most native PRM was selected to investigate its potential to reduce interlaboratory variation and to improve lipid and apolipoprotein standardization. Results: In general, only the NCCLS C37-A-type materials displayed normalized residuals below the decision limit for commutability and had small CVNetto values ranging between 0 and 3.8%. This contrasts with the findings in regularly pooled frozen sera and lyophilized cryoprotected PRMs. In two subsequent external quality assessment surveys, the NCCLS type C37-A materials contributed to reducing the intermethod lipid and (apo)lipoprotein variation to ∼2–4%. Conclusions: NCCLS C37-A materials have a strong potential as secondary reference materials, not only for cholesterol but also for HDL-cholesterol, LDL-cholesterol, triglyceride, and apolipoprotein measurements.

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