Drying regime maps for particulate coatings

AIChE Journal ◽  
2010 ◽  
Vol 56 (11) ◽  
pp. 2769-2780 ◽  
Author(s):  
Christine M. Cardinal ◽  
Yoon Dong Jung ◽  
Kyung Hyun Ahn ◽  
L. F. Francis
Keyword(s):  
Particulate Coatings ◽  
Drying Regime

A metal- coating Chamber for High-Resolution Cryo-SEM

1990 ◽  
Vol 48 (1) ◽  
pp. 418-419
Author(s):  
John G. Sheehan
Keyword(s):  
High Resolution ◽  
Colloidal Suspensions ◽  
Metal Coating ◽  
Colloidal Interactions ◽  
Amorphous Ice ◽  
High Vapor ◽  
Particulate Coatings ◽  
20 Nm ◽  
Film Nucleation ◽  
Coating Chamber

Improvements in particulate coatings for printable paper require understanding mechanisms of colloidal interactions in paper coating suspensions. One way to deduce colloidal interactions is to mage particle spacings and orientations at high resolution with cryo-SEM. Recent improvements in cryo-SEM technique have increased resolution enough to image particles in coating paints,vhich are sometimes smaller than 100 nm. In this report, a metal-coating chamber is described for preparation of colloidal suspensions for cryo-SEM at resolution down to 20 nm. It was found that etching is not necessary to achieve this resolution.A 120 K cryo-SEM sample will remain in an SEM for hours without noticeable condensation of imorphous ice. This is due to the high vapor pressure of vapor-condensed amorphous ice, measured by Kouchi. However, clean vacuum is required to coat samples with the thinnest possible continuous metal films which are required for high magnification SEM. Vapor contaminants, especially hrydrocarbons, are known to interfere with thin-film nucleation and growth so that more metal is needed to form continuous films, and resolution is decreased. That is why the metal-coating chamber in fig. 1 is designed for the cleanest possible vacuum. Feedthroughs for the manipulator md the shutter, which are operated during metal coating, are sealed with leak-proof stainless-steel Dellows. The transfer rod slides through a baseplate feedthrough that is double o-ring sealed.

Simulation of volumetric heating of a moist medium with allowance for fluid mobility

2012 ◽  
Vol 9 (1) ◽  
pp. 91-93
Author(s):  
U.R. Ilyasov ◽  
A.V. Dolgushev
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Numerical Solution ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Thermal Action ◽  
Mass Transfer Process ◽  
Low Permeability ◽  
Volumetric Heating ◽  
Drying Regime

The problem of volumetric thermal action on a moist porous medium is considered. Numerical solution, the influence of fluid mobility on the dynamics of the heat and mass transfer process is analyzed. It is established that fluid mobility leads to a softer drying regime. It is shown that in low-permeability media, the fluid can be assumed to be stationary.

Selective Radiation Properties of Particulate Coatings

1963 ◽  
Vol 85 (3) ◽  
pp. 213-220 ◽  
Author(s):  
D. A. Williams ◽  
T. A. Lappin ◽  
J. A. Duffie
Keyword(s):  
Optical Properties ◽  
Radiation Properties ◽  
High Fraction ◽  
Energy Absorbers ◽  
Coated Surfaces ◽  
Particulate Coatings ◽  
Aluminum Substrates ◽  
Coating Weight ◽  
Theoretical Considerations ◽  
Better Than

The variation with wavelength of thermal radiation properties of coated surfaces is important for solar energy absorbers and in other applications, and depends on the optical properties of the coating material and the substrate, and on the structure of the coating. Theoretical considerations indicate that, for homogeneous coatings, the good optical properties of semiconductors can be improved if the coating contains a high fraction of voids. This improvement has been shown by experimental particulate PbS coatings which are not homogeneous; the selective properties of particulate coatings are better than those calculated for solid coatings at the same coating weight. PbS coatings on aluminum substrates show absorptances for solar radiation of 0.9 and long wave emittance of 0.2 to 0.3. The feasibility of selective paints has been demonstrated; PbS can be mixed with a transparent binder, silicone, to make a paint which shows a good degree of selectivity, and absorptances of 0.9 and emittances less than 0.4 have been obtained.

scholarly journals Influence of the drying regime on the quality indicators of dry mare’s milk

2021 ◽  
Vol 937 (2) ◽  
pp. 022099
Author(s):  
S Yu Smolentsev ◽  
L M Sufyanova ◽  
A S Makarov ◽  
N Yu Garafutdinova ◽  
O I Shorkina ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Quality Indicators ◽  
Experimental Studies ◽  
Quality Parameters ◽  
Optimum Temperature ◽  
Optimal Temperature ◽  
Drying Process ◽  
Milk Pasteurization ◽  
Drying Regime ◽  
Selection Of

Abstract The data on the influence of the temperature regime of the spray drying process on the quality parameters of dry mare’s milk are given. The results of experimental studies on the selection of the optimal drying mode for maximum preservation of the quality indicators of the final product are presented. It was revealed that the optimum temperature during the drying process of mare’s milk is the temperature at the entrance to the dryer t = 180°C, at the exit t = 70-80°C. The study of qualitative indicators with this drying mode showed that the particle size (more than 68%) was 117-140 microns, the solubility index was 0.18 ml of insoluble sediment in 50 ml of reconstituted mare’s milk, the moisture in dry mare’s milk was 3.8% (at t = 180°C), which met all the requirements of the standard. In addition, it was found that the correct heat treatment of mare’s milk before drying also affects the quality indicators of the dry product. The most optimal temperature for milk pasteurization is a temperature of no more than 60°C.

Influence of Particle Shape on the Drying Regime Maps for Platelike Particle–Polymer Composites

Langmuir ◽  
2020 ◽  
Vol 36 (22) ◽  
pp. 6245-6253 ◽  
Author(s):  
Vı́ctor-Alfonso Gracia-Medrano-Bravo ◽  
Jakob Gröne ◽  
Susanna Baesch ◽  
Philip Scharfer ◽  
Wilhelm Schabel
Keyword(s):  
Polymer Composites ◽  
Particle Shape ◽  
Drying Regime

Kernel brown centres in macadamia: a review

2009 ◽  
Vol 60 (12) ◽  
pp. 1117 ◽  
Author(s):  
M. D. Le Lagadec
Keyword(s):  
Moisture Content ◽  
Cell Membranes ◽  
Future Research ◽  
Causal Factors ◽  
Macadamia Integrifolia ◽  
Drying Regime

The incidence of kernel brown centres in macadamia (Macadamia integrifolia and M. tetraphylla and hybrids) has increased substantially in Australia. Although the defect amounts to only ~1% of all kernels processed in Australia, it costs the macadamia industry over AU$2 million per annum. Little formal research has been conducted, although the defect is mentioned widely in informal grower journals. Possible causal factors are reviewed in this article. Evidence suggests that kernel brown centres may be associated with exposure of enzymes in cell membranes and are also associated with incorrect nut-in-shell drying regimes. There appears to be an interaction among nut-in-shell moisture content, nut drying regime, and the incidence of brown centres. There is some indication that storage of wet nuts in poorly ventilated silos increases the potential for developing kernel brown centres. It is recommended that future research focusses on these issues.

scholarly journals Particulate Coatings via Evaporation-Induced Self-Assembly of Polydisperse Colloidal Lignin on Solid Interfaces

Langmuir ◽  
2018 ◽  
Vol 34 (20) ◽  
pp. 5759-5771 ◽  
Author(s):  
Oriol Cusola ◽  
Samu Kivistö ◽  
Sampsa Vierros ◽  
Piotr Batys ◽  
Mariko Ago ◽  
...  
Keyword(s):  
Self Assembly ◽  
Evaporation Induced Self Assembly ◽  
Particulate Coatings
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