Size dependent absorption kinetics of sedimenting nanoparticles

2013 ◽  
Author(s):  
Manoranjan Ghosh ◽  
Karabi Ghosh ◽  
Seema Shinde ◽  
S. C. Gadkari
Keyword(s):  
Absorption Kinetics ◽  
Size Dependent ◽  
Dependent Absorption ◽  
Kinetics Of

Effect of iron source on iron absorption by in situ ligated intestinal loops of broilers

2017 ◽  
Vol 57 (2) ◽  
pp. 308 ◽  
Author(s):  
Xiaofei Li ◽  
Lingyan Zhang ◽  
Liyang Zhang ◽  
Lin Lu ◽  
Xugang Luo
Keyword(s):  
Amino Acids ◽  
Absorption Rate ◽  
Iron Absorption ◽  
Protein Complexes ◽  
Absorption Kinetics ◽  
Main Site ◽  
Dependent Absorption ◽  
Kinetics Of ◽  
Menten Constant

Two experiments were conducted to investigate the effect of iron (Fe) source on Fe absorption by in situ ligated intestinal loops of broilers. In Experiment 1, in situ ligated intestinal loops from Fe-deficient chicks (29 days old) were perfused with solutions containing 0.45 mmol Fe/L from FeSO4 (FeSO4·7H2O), Fe-Gly chelate, Fe-Met chelate, one of three Fe-amino acid or protein complexes with weak, moderate or extremely strong complex strength (Fe-Met W, Fe-Pro M, or Fe-Pro ES), or the mixtures of FeSO4 with either Gly or Met (Fe + Gly or Fe + Met), respectively, up to 30 min. In Experiment 2, in situ ligated duodenal loops from Fe-deficient chicks (29 days old) were perfused with solutions containing 0–3.58 mmol Fe/L from FeSO4, Fe-Met W, Fe-Pro M, or Fe-Pro ES up to 30 min. The absorptions of Fe from both inorganic and organic Fe sources in the ligated duodenum were ~1.35–2.8 times higher (P < 0.05) than that in the ligated jejunum or ileum. The absorption of Fe as Fe-Pro M or Fe-Pro ES was higher (P < 0.05) than that of Fe as inorganic Fe or Fe-Met W at Fe concentration of 3.58 mmol/L. The absorption kinetics of Fe from organic and inorganic Fe sources in the ligated duodenal loops followed a saturable process as determined by regression analysis of concentration-dependent absorption rates. The maximum absorption rate and Michaelis–Menten constant values in the ligated duodenal loops were higher (P < 0.05) for Fe-Pro M and Fe-Pro ES than for FeSO4 and Fe-Met W. The results from this study indicate that the duodenum was the main site of Fe absorption in the intestines of broilers; organic Fe sources with stronger complex strength values showed higher Fe absorptions at a higher concentration of added Fe; and the simple mixture of FeSO4 with amino acids did not increase Fe absorption.

scholarly journals Physical properties and water absorption kinetics of three varieties of Mucuna beans

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ajibola B. Oyedeji ◽  
Olajide P. Sobukola ◽  
Ezekiel Green ◽  
Oluwafemi A. Adebo
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Rate Constant ◽  
Geometric Mean ◽  
Seed Mass ◽  
Activation Energies ◽  
Mucuna Pruriens ◽  
Absorption Kinetics ◽  
Kinetics Of ◽  
Soaking Temperature

AbstractThe physical properties and water absorption kinetics of three varieties of Mucuna beans (Mucuna pruriens, Mucuna rajada and Mucuna veracruz) were determined in this study. Physical properties including length, width, thickness, geometric mean diameter, sphericity, porosity, bulk density, area, volume and one thousand seed mass were calculated while hydration kinetics was studied by soaking Mucuna beans in water at 30 °C, 40 °C and 50 °C and measuring water uptake at 9 h interval. Peleg’s equation was used to model the hydration characteristics and Arrhenius equation was used to describe the effect of temperature on Peleg’s rate constant k1 and to obtain the activation energies for soaking. Significant variations were observed in almost all the physical properties of the different varieties, however, there were no significant differences (p < 0.05) in their thicknesses and bulk densities. The effectiveness of fit of Peleg’s model (R2) increased with increase in soaking temperature. Peleg’s rate constant k1 decreased with increase in soaking temperature while k2 increased with temperature increase. Activation energies of Mucuna pruriens, Mucuna rajada and Mucuna veracruz were 1613.24 kJ/mol, 747.95 kJ/mol and 2743.64 kJ/mol, respectively. This study provides useful information about the properties of three varieties of Mucuna beans that could be of importance to processors and engineers for process design and optimization.

Theoretical analysis of water absorption kinetics of recycled aggregates immersed in water

2021 ◽  
Vol 302 ◽  
pp. 124156
Author(s):  
Kun Liang ◽  
Yingjie Hou ◽  
Jianchun Sun ◽  
Xiaoguang Li ◽  
Jiahong Bai ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Water Absorption ◽  
Recycled Aggregates ◽  
Absorption Kinetics ◽  
Kinetics Of

Study on the Formaldehyde Adsorption Kinetics of Dry Waters

2014 ◽  
Vol 809-810 ◽  
pp. 907-911
Author(s):  
Jun Long Wang ◽  
Jie Hou ◽  
Ting Jiang ◽  
Yong Jun He ◽  
Yao Dong Liang
Keyword(s):  
Adsorption Kinetics ◽  
High Speed ◽  
Adsorption Process ◽  
Average Diameter ◽  
Adsorption Rate ◽  
Absorption Kinetics ◽  
Order Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Formaldehyde Adsorption

Dry waters with an average diameter of 82 μm were prepared by a high speed mixed route. The formaldehyde absorption kinetics of dry waters was investigated by simulating indoor formaldehyde pollution in glass chamber. The results showed that pseudo-second order model could be used to simulate the adsorption process; the adsorption rate was highest in the initial 60 minutes; when the adsorption lasted for 180 minutes, the adsorption reached equilibrium.

Oxygen Absorption Kinetics of Sheets and Films Containing a Commercial Iron-based Oxygen Scavenger

2009 ◽  
Vol 15 (2) ◽  
pp. 159-168 ◽  
Author(s):  
M.J. Galotto ◽  
S.A. Anfossi ◽  
A. Guarda
Keyword(s):  
Relative Humidity ◽  
Kinetic Parameters ◽  
Oxygen Absorption ◽  
Absorption Kinetics ◽  
Oxygen Scavenger ◽  
Arrhenius Behavior ◽  
Oxygen Scavengers ◽  
Iron Based ◽  
Empirical Growth ◽  
Kinetics Of

Absorption kinetics of three different forms of the same iron-based oxygen scavenger were studied. Oxygen scavengers were used as pellet, sheet, and film materials. Two scavenger concentrations were used for sheet and film forms. Scavenger samples were analyzed at 75 or 100% relative humidities and stored at 5, 15, and 25°C. Oxygen concentration in the headspace was measured as a function of time. Absorption kinetics was best described by the Chapman-Richards empirical growth model rather than by a first-order reaction. Arrhenius behavior was observed for variations in the final absorption rate with temperature. Absorption capacities, final absorption rates, and activation energies were evaluated and discussed. Scavenger concentration, relative humidity, and temperature effects on kinetic parameters were studied for each experimental condition. Temperature was the most important factor that affected kinetic parameters. At the relative humidity levels studied, any important effect on kinetic parameters was not observed, except on absorption capacities.

Size-dependent thermal decomposition and kinetics of ultrafine alkali metal styphnates

RSC Advances ◽  
2014 ◽  
Vol 4 (74) ◽  
pp. 39463-39471 ◽  
Author(s):  
Rui Liu ◽  
Wenyuan Zhao ◽  
Tonglai Zhang ◽  
Li Yang ◽  
Zunning Zhou ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Alkali Metal ◽  
Decomposition Temperature ◽  
Size Dependent ◽  
Kinetics Of

The styphnate of smaller size possesses lower decomposition temperature and higher reactivity.

scholarly journals Aminophosphine Reduction Mechanisms and the Synthesis of Indium Phosphide Nanomaterials

2021 ◽  
Author(s):  
◽  
Geoffry Laufersky
Keyword(s):  
Indium Phosphide ◽  
Density Functional ◽  
Large Scale ◽  
Visible Spectrum ◽  
Size Dependent ◽  
Reduction Mechanisms ◽  
Highly Sensitive ◽  
Dependent Absorption ◽  
Entire Visible Spectrum ◽  
The Impact

<p>Indium phosphide (InP) nanomaterials are attractive for countless technological applications due to their well-placed band gap energies. The quantum confinement of these semiconductors can give rise to size-dependent absorption and emission features throughout the entire visible spectrum. Therefore, InP materials can be employed as low-toxicity fluorophores that can be implemented in high value avenues such as biological probes, lighting applications, and lasing technologies. However, large scale development of these quantum dots (QDs) has been stymied by the lack of affordable and safe phosphorus precursors. Syntheses have largely been restricted to the use of dangerous chemicals such as tris(trimethylsilyl)phosphine ((TMS)₃P), which is costly and highly sensitive to oxygen and water. Recently, less-hazardous tris(dialkylamino)phosphines have been introduced to produce InP QDs on par with those utilizing (TMS)₃P. However, a poor understanding of the reaction mechanics has resulted in difficulties tuning and optimizing this method.  In this work, density functional theory (DFT) is used to identify the mechanism of this aminophosphine precursor conversion. This understanding is then implemented to design an improved InP QD synthesis, allowing for the production of high-quality materials outside of glovebox conditions. Time is spent understanding the impact of different precursor salts on the reaction mechanisms and discerning their subsequent effects on nanoparticle size and quality. The motivation of this work is to formulate safer and less technical indium phosphide quantum dot syntheses to foster non-specialist and industrial implementation of these materials.</p>

Absorption Kinetics of Griseofulvin in Man

1968 ◽  
Vol 57 (6) ◽  
pp. 984-989 ◽  
Author(s):  
M. Rowland ◽  
S. Riegelman ◽  
W.L. Epstein
Keyword(s):  
Absorption Kinetics ◽  
Kinetics Of
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