Two-step spray-drying synthesis of dense and highly luminescent YAG:Ce3+ phosphor powders with spherical shape

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 8345-8350 ◽  
Author(s):  
Jung Sang Cho ◽  
Kyeong Youl Jung ◽  
Yun Chan Kang
Keyword(s):  
Size Distribution ◽  
Spray Drying ◽  
Spherical Shape ◽  
Potential Method ◽  
Luminescence Properties ◽  
Spray Dryer ◽  
Narrow Size Distribution ◽  
Drying Process

Two-step spray drying using a commercially available spray dryer was carried out to prepare YAG:Ce3+ phosphor particles. The two-step spray-drying process was a potential method for producing YAG:Ce3+ phosphor particles with spherical shape, narrow size distribution, and good luminescence properties.

Macrostructure and microphysics of Saturn's E-ring

1984 ◽  
Vol 75 ◽  
pp. 607-613 ◽  
Author(s):  
Kevin D. Pang ◽  
Charles C. Voge ◽  
Jack W. Rhoads
Keyword(s):  
Size Distribution ◽  
Spherical Shape ◽  
Mie Scattering ◽  
Narrow Size Distribution ◽  
Electrostatic Levitation ◽  
Volcanic Origin ◽  
Micron Diameter

Abstract.All observed optical and infrared properties of Saturn's E-ring can be explained in terms of Mie scattering by a narrow size distribution of ice spheres of 2 - 2.5 micron diameter. The spherical shape of the ring particles and their narrow size distribution imply a molten (possibly volcanic) origin on Enceladus. The E-ring consists of many layers, possibly stratified by electrostatic levitation.

Nanocomposites by Covalent Bonding between Inorganic Nanoparticles and Polymers

2001 ◽  
Vol 676 ◽  
Author(s):  
Yigal D. Blum ◽  
Nobuyuki Kambe ◽  
D. Brent MacQueen ◽  
Sujeet Kumar ◽  
Shiv Chiruvolu ◽  
...  
Keyword(s):  
Size Distribution ◽  
Spherical Shape ◽  
Covalent Bonding ◽  
Polymeric Matrix ◽  
Inorganic Nanoparticles ◽  
Narrow Size Distribution ◽  
Processing Capability

ABSTRACTA generic approach to chemically facilitate the interactions of nanoparticles with conventional polymers is developed to address the design and processing capability of inorganic-organic nanocomposites. This approach introduces homogeneity to the composite and can be used as a tailoring tool for microstructure architecture.Nanoparticles produced by NanoGram's technology are excellent for such nanocomposites. Their spherical shape and narrow size distribution assist in the processing of homogeneous blends. High loads of particles within a polymeric matrix can be achieved without losing homogeneity. Alternatively, the particles can be selectively attracted into desired domains.

scholarly journals Effect of Drying Temperature of Small Scale Spray Dryer on Physical Properties of Coffee Powder

2020 ◽  
Vol 28 (4) ◽  
Author(s):  
Joko Nugroho Wahyu Karyadi ◽  
Dwi Ayuni ◽  
Tsania Ayu Rohani ◽  
Devi Yuni Susanti
Keyword(s):  
Moisture Content ◽  
Physical Properties ◽  
Spray Drying ◽  
Product Yield ◽  
Feed Solution ◽  
Small Scale ◽  
Inlet Temperature ◽  
Spray Dryer ◽  
Drying Process ◽  
High Product Yield

Nowadays, coffee has become one of the most favorable commodities for beverages, flavoring as well as for cosmetic industries. In Indonesia, coffee becomes more popular, especially among youngsters. In this study, the spray drying process was evaluated, giving the potential of how simple spray dryer can help local farmers of Indonesia to produce their coffee powders. One small scale of spray dryer was constructed with the total dimensions of 2.85 x 0.64 for length x width, with a height of 2.32 m. The spray dryer was equipped with a digital thermo regulator, the pneumatic nozzle system, and 4 finned heaters with the power of 2700 watt for each. The spray drying constructed was revealed to be able to produce coffee powders with fine quality. The inlet temperature of the drying chamber, as well as the initial Brix content of feed solution, were proven to affect the physical properties of powder produced such as moisture content, product yield, and solubility. The final moisture content of powders was ranged from 3 - 7% db, with the high product yield of the drying process, which could reach up to 70%.

Large-scale production of spherical Y2O3:Eu3+ phosphor powders with narrow size distribution using a two-step spray drying method

RSC Advances ◽  
2014 ◽  
Vol 4 (108) ◽  
pp. 62965-62970 ◽  
Author(s):  
Jung Sang Cho ◽  
Kyeong Youl Jung ◽  
Mun Young Son ◽  
Yun Chan Kang
Keyword(s):  
Size Distribution ◽  
Spray Drying ◽  
Mass Production ◽  
Large Scale ◽  
Scale Production ◽  
Narrow Size Distribution ◽  
Drying Method ◽  
Large Scale Production

Dense spherical Y2O3:Eu3+ phosphor particles with a narrow size distribution were successfully prepared by using a two-step spray drying method. This method is easily scalable and can therefore be applied to the mass production of phosphor particles with high photoluminescence.

Process Factors Using Centrifugal Spray Drying to Prepare Bauxite Microspheres

2011 ◽  
Vol 399-401 ◽  
pp. 828-833
Author(s):  
Xiao Su Cheng ◽  
Meng Qi Peng ◽  
Yu Fa Zhong
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Spray Drying ◽  
Average Diameter ◽  
Optimal Operation ◽  
Solid Content ◽  
Diameter Distribution ◽  
Drying Process ◽  
Process Factors

The centrifugal spray drying process of bauxite slurry was studied to investigate the influence of slurry solid content on the particle size distribution and the sphericity of the microspheres, and so was operation technology on average diameter and the sphericity of the microspheres. The optimal operation parameters are obtained to prepare high spherical microspheres bauxite with the diameter distribution of 100 μm and whose particle size distribution is narrow: the slurry solid content is 70 wt%, the dry air temperature is 250 °C, the rotation rate of spray head is 6000 rpm and the feed flow rate is 1 L/h in the experiments.

scholarly journals Energetic Analysis in a Spray Drying Process

2020 ◽  
Vol 7 ◽  
pp. 40-47
Author(s):  
Alex Notaroberto Madeira ◽  
Carlos Alberto Chaves ◽  
Wendell de Queiróz Lamas
Keyword(s):  
Spray Drying ◽  
Water Mass ◽  
Spray Dryer ◽  
Water Spray ◽  
Drying Process ◽  
Power Sources ◽  
Atmospheric Air ◽  
Energetic Analysis

 The present work aims in evaluate the installation of an equipment of spray drying, by psychrometry technique, analyse the power sources consumption and relates with the productivity of the equipment, by energy auditory. This work consists in comparing the evaporation capacity of a 750 kg/h of water spray dryer and the amount of water that comes from atmospheric air, where the equipment consumes 160 kWh and 80 kg of LGP/h. Therefore, this work demonstrates that to project a spray dryer it must be analysed these water mass values in atmospheric air and be contemplated a dehumidifier in order to prevent so significant and different losses in different periods of the same day.

scholarly journals Influence of combined hydrolyzed collagen and maltodextrin as carrier agents in spray drying of cocona pulp

2020 ◽  
Vol 23 ◽  
Author(s):  
Diana Patricia Vargas-Muñoz ◽  
Louise Emy Kurozawa
Keyword(s):  
Particle Size ◽  
Spray Drying ◽  
Chemical Structure ◽  
Particle Diameter ◽  
Spray Dryer ◽  
Drying Process ◽  
Hydrolyzed Collagen ◽  
Bioactive Properties ◽  
Encapsulation Process ◽  
Mean Particle Diameter

Abstract This work aimed to evaluate the effect of carrier agents containing maltodextrin and protein, represented by hydrolyzed collagen on the spray drying process of cocona (Solanum sessiliflorum Dunal), and on the properties of the resulting powders. We used pre-established proportions between the solids of cocona pulp and the carrier agents (P:CA), and among carrier agents themselves, maltodextrin and hydrolyzed collagen, (MD:HC). The process was carried out in a spray dryer at an inlet air temperature of 120 ºC. We prepared twelve feed solutions containing 20% of total solids, with P:CA ratios of 1:3, 1:4, 1:5 and 1:6, and MD:HC ratios of 0:100, 50:50, and 100:0. Solids recovery was obtained for the evaluation of the spray drying process. The cocona pulp powders were analyzed for moisture content, water activity, particle size distribution, mean particle diameter, chemical structure (FTIR) and color. For a P:CA of 1:6, for the sample formulated with hydrolyzed collagen only, solids recovery (96.2%) was much higher than that of the sample with maltodextrin only (39.2%). The chemical structure of cocona powders can be considered a sign of a good encapsulation process. The color of the cocona pulp powder was similar to that of the carrier agents. The formulation with highest content of hydrolyzed collagen improved the recovery of solids, guaranteed the cocona pulp encapsulation, and obtained fruit powders with bioactive properties.

Photo-Luminescence Properties of Novel ZnO Nano-Phosphors

2014 ◽  
Vol 938 ◽  
pp. 311-315
Author(s):  
Manmohan Singh Kurrey ◽  
Bhoopendra Dhar Diwan
Keyword(s):  
Zinc Oxide ◽  
Size Distribution ◽  
Visible Region ◽  
Photo Luminescence ◽  
Luminescence Properties ◽  
Narrow Size Distribution ◽  
Solgel Method ◽  
Optoelectronic Applications ◽  
Size And Morphology ◽  
Thermo Luminescence

In this paper we have reported excellent luminescence properties of novel nanophosphors synthesized through solgel method with narrow size distribution. The size and morphology of the prepared ZnO nanophosphors has been confirmed through XRD and SEM. We have investigated their photo-luminescence (PL) intensity as a function of wavelength. We have prepared ZnO nanophosphor of size 6 nm. It is observed two different emission peaks near 375 nm in the ultraviolet (UV) and near 525 nm in the visible region. The prepared ZnO nanophosphor has enough potential for optoelectronic applications. Keywords: Dosimetry; Thermo-luminescence; Zinc oxide; Nanophosphors.

scholarly journals Şeker İçeriği Yüksek Gıdaların Püskürtülerek Kurutulması: Ürün Kazanımı ve Toz Ürün Özelliklerinin Geliştirilmesi

2016 ◽  
Vol 4 (5) ◽  
pp. 336 ◽  
Author(s):  
Mehmet Koç ◽  
Figen Kaymak-Ertekin
Keyword(s):  
Spray Drying ◽  
Food Industry ◽  
Low Molecular Weight ◽  
Spray Dryer ◽  
Powder Form ◽  
Drying Method ◽  
Drying Process ◽  
High Moisture ◽  
Rich Liquid ◽  
Low Solubility

Spray drying is the most preferred drying method to produce powdered food in the food industry and it is also widely used to convert sugar-rich liquid foods to a powder form. During and/or after spray drying process of sugar-rich products, undesirable situation was appeared such as stickiness, high moisture affinity (hygroscopicity) and low solubility due to low molecular weight monosaccharides that found naturally in the structure. The basis of these problems was formed by low glass transition temperature of sugar-rich products. This review gives information about the difficulties in drying of sugar-rich products via spray dryer, actions need to be taken against these difficulties and drying of sugar-rich honey and fruit juices with spray drying method.

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