scholarly journals Polysaccharide-Based Aerogel Bead Production via Jet Cutting Method

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1287 ◽  
Author(s):  
Imke Preibisch ◽  
Philipp Niemeyer ◽  
Yusuf Yusufoglu ◽  
Pavel Gurikov ◽  
Barbara Milow ◽  
...  
Keyword(s):  
Particle Production ◽  
Scale Up ◽  
Supercritical Drying ◽  
Absorption Capacity ◽  
Diffusion Method ◽  
Size Distributions ◽  
Solvent Exchange ◽  
Particle Size Distributions ◽  
Cutting Method ◽  
Ph Adjustment

The aim of this work is to develop a method to produce spherical biopolymer-based aerogel particles, which is capable for scale-up in the future. Therefore, the jet cutting method is suggested. Amidated pectin, sodium alginate, and chitosan are used as a precursor (a 1–3 wt. % solution) for particle production via jet cutting. Gelation is realized via two methods: the internal setting method (using calcium carbonate particles as cross-linkers and citric and acidic acid for pH adjustment) and the diffusion method (in calcium chloride solutions). Gel particles are subjected to solvent exchange to ethanol and consequent supercritical drying with CO2. Spherical aerogel particles with narrow particle size distributions in the range of 400 to 1500 µm and a specific surface area of around 500 m2/g are produced. Overall, it can be concluded that the jet cutting method is suitable for aerogel particle production, although the shape of the particles is not perfectly spherical in all cases. However, parameter adjustment might lead to even better shaped particles in further work. Moreover, the biopolymer-based aerogel particles synthesized in this study are tested as humidity absorbers in drying units for home appliances, particularly for dishwashers. It has been shown that for several cycles of absorption and desorption of humidity, aerogel particles are stable with an absorption capacity of around 20 wt. %.

scholarly journals Biopolymer-Based Aerogel Bead Production via Jet Cutting Method

2018 ◽  
Author(s):  
Imke Preibisch ◽  
Philipp Niemeyer ◽  
Yusuf Yusufoglu ◽  
Pavel Gurikov ◽  
Barbara Milow ◽  
...  
Keyword(s):  
Particle Production ◽  
Scale Up ◽  
Supercritical Drying ◽  
Absorption Capacity ◽  
Narrow Particle Size Distribution ◽  
Diffusion Method ◽  
Solvent Exchange ◽  
Cutting Method ◽  
Cross Linker ◽  
And Diffusion

The aim of this work is to develop a method to produce spherical biopolymer-based aerogel particles, which is capable for scale up in the future. Therefore, jet cutting method is suggested. Amidated pectin and sodium alginate were used as precursor (1–3 wt. % solution) for particle production via jet cutting. Gelation was realized via two methods: internal setting method (using calcium carbonate particles as cross-linker and citric and acidic acid for pH adjustment) and diffusion method (in calcium chloride solutions). Gel particles were subjected to solvent exchange to ethanol and consequent supercritical drying with CO2. Spherical aerogel particles with narrow particle size distribution in the range of 400 to 1500 µm and with specific surface area of around 500 m2/g could be produced. Overall, it can be concluded that jet cutting method is suitable for aerogel particle production, although the shape of the particles is not perfectly spherical in all cases. However, parameter adjustment might lead to even better shaped particles in further work. Moreover, the biopolymer-based aerogel particles synthesized in this study were tested as humidity absorber in drying units for home appliances, particularly for dishwashers. It could be shown that for several cycles of absorption and desorption of humidity aerogel particles are stable with an absorption capacity of around 20 wt. %.

Simulation of Particle Synthesis by Premixed Laminar Stagnation Flames

2013 ◽  
Vol 1506 ◽  
Author(s):  
Abhijit Modak ◽  
Karthik Puduppakkam ◽  
Chitralkumar Naik ◽  
Ellen Meeks
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Particle Production ◽  
Soot Formation ◽  
Laminar Flame ◽  
Practical Importance ◽  
Batch Reactors ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Premixed Laminar

ABSTRACTA sectional method for determining particle size distributions has been implemented within the particle tracking module included with CHEMKIN-PRO. The module is available for use with many types of reactor models, ranging from 0-D batch reactors to laminar flame simulations. Coupled with the Burner-stabilized Stagnation Flame (BSSF) Model, the sectional model offers a high-fidelity, robust, and efficient computational framework for simulating flame synthesis of particles in a laminar, premixed stagnation flame environment. The CHEMKIN-PRO coupling allows inclusion of detailed gas-phase chemistry that determines key particle-formation precursors, along with physical processes such as nucleation and coagulation of particles. These capabilities are demonstrated for two flame-particle systems of practical importance, viz. nanocrystalline titania synthesis and soot formation. The results are compared with experimental data obtained at the University of Southern California (USC) flame facility. Computed particle size distributions show good agreement with experimental data. Simulations have led to exploration of the parameter space for particle production and particle-size influences.

scholarly journals Gellan aerogel production applying supercritical technology

2019 ◽  
Author(s):  
Gabriela Fujita de Freitas ◽  
Julian Martinez ◽  
Juliane Viganó
Keyword(s):  
Carbon Dioxide ◽  
High Surface ◽  
High Surface Area ◽  
Supercritical Drying ◽  
Gelling Agent ◽  
Diffusion Method ◽  
Low Density ◽  
Solvent Exchange ◽  
Hydrogel Formulation ◽  
Pre Treatment

Aerogels are materials with an open porous, low density and high surface area, which make them an interesting material to carry target compounds. The proposal of this work was to produce gellan aerogels and to study the effect of the diffusion method and internal setting method, the temperature of the gellan pre-treatment, and the addition of inulin on the aerogel shrinkage during the process. The aerogels were produced through hydrogel formulation, solvent exchange to obtain alcogel, and supercritical drying with carbon dioxide. The addition of inulin has reduced the shrinkage, but gelling methods to avoid the inulin loss must be studied, as the oil containing the gelling agent.

scholarly journals Review on the Production of Polysaccharide Aerogel Particles

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2144 ◽  
Author(s):  
Kathirvel Ganesan ◽  
Tatiana Budtova ◽  
Lorenz Ratke ◽  
Pavel Gurikov ◽  
Victor Baudron ◽  
...  
Keyword(s):  
Scale Up ◽  
Supercritical Drying ◽  
Pilot Scale ◽  
Scale Production ◽  
Solvent Exchange ◽  
Drying Process ◽  
Potential Scale ◽  
Potential Applications ◽  
Pass Through ◽  
Wet Particles

A detailed study of the production of polysaccharide aerogel (bio-aerogel) particles from lab to pilot scale is surveyed in this article. An introduction to various droplets techniques available in the market is given and compared with the lab scale production of droplets using pipettes and syringes. An overview of the mechanisms of gelation of polysaccharide solutions together with non-solvent induced phase separation option is then discussed in the view of making wet particles. The main steps of particle recovery and solvent exchange are briefly described in order to pass through the final drying process. Various drying processes are overviewed and the importance of supercritical drying is highlighted. In addition, we present the characterization techniques to analyse the morphology and properties of the aerogels. The case studies of bio-aerogel (agar, alginate, cellulose, chitin, κ-carrageenan, pectin and starch) particles are reviewed. Potential applications of polysaccharide aerogel particles are briefly given. Finally, the conclusions summarize the prospects of the potential scale-up methods for producing bio-aerogel particles.

254. A Comparison of the Particle Size Distributions for Aerosols Generated During Wet Grinding and Dry Deburring of Beryllium

1999 ◽  
Author(s):  
K.K. Ellis ◽  
R. Buchan ◽  
M. Hoover ◽  
J. Martyny ◽  
B. Bucher-Bartleson ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Wet Grinding

EXPERIMENTAL INVESTIGATION, SCALE-UP AND MODELING OF DROPLET SIZE DISTRIBUTIONS IN TURBULENT MULTIPHASE JETS

2020 ◽  
Vol 32 (2) ◽  
pp. 113-136 ◽  
Author(s):  
Simeon Pesch ◽  
Rebecca Knopf ◽  
Anahita Radmehr ◽  
Claire B. Paris ◽  
Zachary M. Aman ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Droplet Size ◽  
Scale Up ◽  
Size Distributions ◽  
Droplet Size Distributions

Measurements of Mineral Particle Size Distributions by a Buoyancy Weighing Method

2010 ◽  
Vol 126 (10/11) ◽  
pp. 577-582 ◽  
Author(s):  
Katsuhiko FURUKAWA ◽  
Yuichi OHIRA ◽  
Eiji OBATA ◽  
Yutaka YOSHIDA
Keyword(s):  
Particle Size ◽  
Mineral Particle ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Weighing Method
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