Effect of Raw Material SiO2 Powder Size on the Crystallinity of Sr3SiO5:Eu(3+/2+)(4%) Phosphor and Optical Properties of Eu(3+/2+)

2021 ◽  
Vol 71 (4) ◽  
pp. 353-359
Author(s):  
Purevdulam NANKHAI ◽  
Kiwan JANG*
Keyword(s):  
Optical Properties ◽  
Raw Material ◽  
Powder Size ◽  
Sio2 Powder

Preparation and optical properties of Y2O3/SiO2 powder

Rare Metals ◽  
2011 ◽  
Vol 30 (1) ◽  
pp. 33-38 ◽  
Author(s):  
Xiaoyi Shen ◽  
Yuchun Zhai
Keyword(s):  
Optical Properties ◽  
Sio2 Powder

scholarly journals Effect of extraction method on Curcuma xanthorrhiza oleoresin using solar dryer to concentration of curcuminoid, total phenol and antioxidant activty

2017 ◽  
Vol 14 (1) ◽  
pp. 1-9
Author(s):  
THERESIA AGNIEST PRICILLA VITANTI ◽  
KAWIJI KAWIJI ◽  
EDHI NURHARTADI
Keyword(s):  
Antioxidant Activity ◽  
Extraction Method ◽  
Immersion Time ◽  
Size Variation ◽  
Extraction Process ◽  
Total Phenol ◽  
Raw Material ◽  
Powder Size ◽  
Solar Dryer ◽  
Curcuma Xanthorrhiza

Vitanti TAP, Kawiji, Edhi N. 2012. Effect of extraction method on Curcuma xanthorrhiza oleoresin using solar dryer to concentration of curcuminoid, total phenol, and antioxidant activity. Biofarmasi 14: 1-9. Curcuma (Curcuma xanthorrhiza Roxb.) is a type of drug plant that has high enough capacity of production in Indonesia. Generally, commerced in the form of fresh curcuma or processed product as simple as simplicia and curcuma powder. Processed products that could be developed is curcuma oleoresin. It is a mixture of essential oils and resins obtained from extraction process of curcuma powder using an organic solvent. Oleoresin has the same flavor and aroma to the extracted material. Due to these characteristics, it is used as a flavor and food coloring, other than as a raw material in pharmaceutical industry. In addition, it also contains active compounds which can support the utilization of drug and food industries. This study aims to determine whether the size of the powder, powdered curcuma immersion time, and interactions between them that can be influenced the content of curcuminoids, total phenol and antioxidant activity of curcuma oleoresin. Selection of solar dryers in the drying process is based on previously studied that compare the natural drying technique with a solar dryer, and the best results of those studies are shown in the solar dryer. This research using completely randomized design with two factors: the size variation of curcuma powder (60, 80 and 100 mesh) and immersion time variation (extraction) of curcuma powder (12, 24 and 36 hours). The results showed that the powder size of curcuma and immersion time has an effect on curcuminoid content, total phenol and antioxidant activity of curcuma oleoresin. However, there are no interaction between both factors. That is, the size and the immersion time of curcuma powder do not affect each other on the content of curcuminoid, total phenol and activity of antioxidant.

Phase-controlled synthesis of nickel sulfide series via solvothermal method

2014 ◽  
Vol 07 (01) ◽  
pp. 1450003 ◽  
Author(s):  
Binxia Yuan ◽  
Weiling Luan
Keyword(s):  
Optical Properties ◽  
Nickel Sulfide ◽  
Reduction Method ◽  
Solvothermal Method ◽  
Low Cost ◽  
Nickel Chloride ◽  
Raw Material ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Detailed Composition

Nickel sulfide series nanoparticles were synthesized by a simple solvothermal reduction method of nickel chloride and element sulfur in the oleylamine solvent. This method could offer potential advantages of mildness, safety, low cost, and simplified fabrication procedures. Through the adjustment of Ni / S raw material ratio, different phases of nickel sulfide, including cubic NiS 2, hexagonal NiS , orthorhombic Ni 7 S 6, and trigonal Ni 3 S 2 were obtained. In addition, the sulfur sources played important roles in the synthesis of nickel sulfide series compounds. The possible growth mechanisms had been discussed based on the influence of reaction temperatures and solvents on the phase structure and detailed composition of the final products. Finally, the obtained optical properties demonstrated that each sample had the unique absorption peak except cubic NiS 2.

scholarly journals Impact of raw material surface oxide removal on dual band infrared optical properties of As2Se3 chalcogenide glass

2020 ◽  
Vol 10 (9) ◽  
pp. 2274
Author(s):  
Anupama Yadav ◽  
Myungkoo Kang ◽  
Claudia Goncalves ◽  
Cesar Blanco ◽  
Rashi Sharma ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chalcogenide Glass ◽  
Surface Oxide ◽  
Raw Material ◽  
Dual Band ◽  
Material Surface ◽  
Oxide Removal ◽  
Infrared Optical Properties

Effect of raw material and growth method on optical properties of DKDP crystal

2014 ◽  
Vol 12 (10) ◽  
pp. 101604-101608 ◽  
Author(s):  
Baoan Liu Baoan Liu ◽  
Guohang Hu Guohang Hu ◽  
Qinghua Zhang Qinghua Zhang ◽  
Xun Sun Xun Sun ◽  
Xinguang Xu Xinguang Xu
Keyword(s):  
Optical Properties ◽  
Raw Material ◽  
Growth Method

Optical Properties Improvement of Recycled Polypropylene with Material Value Conservation Schemes Using Virgin Plastic Blends

2021 ◽  
Vol 1020 ◽  
pp. 199-205
Author(s):  
Djoko Sihono Gabriel ◽  
Husen Nasrullah
Keyword(s):  
Optical Properties ◽  
New Products ◽  
Plastic Waste ◽  
Raw Material ◽  
Astm Method ◽  
Increasing Trend ◽  
Recycled Plastics ◽  
American Society ◽  
Plastic Pellets

Repetitive implementation of material value conservation (MVC) in plastic packaging may lead to good quality plastic waste and high acceptance for secondary recycling. This makes the obtained recycled plastic pellets has good quality and can be used as an alternative raw material for new products. However, treatments and processing in the recycling processes can lead to the degradation of material properties and disrupt the recycled plastics life cycle to be used for new products with high specifications. Recycled plastics are certainly cheaper than virgin plastics, but they have low properties, contaminated, and are only used for low-value products. Therefore, a solution is needed for this problem. This study proposed mixing recycled and virgin plastic pellets to improve recycled plastics whose optical properties have been subjected to quality degradation. A series of tests were carried out on specimens and tested according to the American Society for Testing and Materials (ASTM) method. The optical properties tested were transparency, gloss, and colour. This study revealed that optical properties had an increasing trend along with the large number of virgin plastic pellets added to the blends. The optimal composition was found in the 50:50 composition of virgin-recycled plastic pellets to the 70:30 composition of virgin-recycled plastic pellets. These findings can be useful in improving the optical properties of recycled plastics. In addition, the widespread implementation of MVC can improve the quality of plastic waste and strengthen its acceptance for secondary recycling.

Effect of anthraquinone on brightness value and crystalline structure of pulp during soda processes

2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Esat Gümüşkaya ◽  
Evren Kalyoncu ◽  
Hüseyin Kirci
Keyword(s):  
Optical Properties ◽  
Crystalline Structure ◽  
Cooking Time ◽  
Raw Material ◽  
Monoclinic Structure ◽  
Triclinic Structure ◽  
Cooking Times

AbstractThe dependence of crystalline structure and optical properties of pulp on anthraquinone (AQ) added to the soda process at different cooking times was determined in this study. Wheat (Triticum aestevum L.) straw was used as the raw material for pulp. Soda and soda-AQ processes were selected for pulping at 80 min and 120 min. The soda-AQ process improved the yield and viscosity of pulp delignification ratio for pulping in comparison with the soda process. Crystallinity of pulp samples decreased by adding anthraquinone to the soda process because of stabilized less ordered cellulose and amorphous hemicelluloses in pulp. It was determined that crystallinity of pulp samples decreased with longer cooking time, from 80 min to 120 min, in both soda and soda-AQ processes. Monoclinic structure was dominant in pulp samples; however, the triclinic structure ratio increased in both soda and soda-AQ processes compared to raw material. It was found that brightness and lightness values in pulp samples decreased when using anthraquinone depending on the changes of the crystalline structure.

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