Determination of in-plane permeability of fiber preforms by the gas flow method using pressure measurements

Abstract Isopiestic vapor pressure measurements and calorimetric determination of the heat of dilution have been performed and evaluated with respect to enthalpy, entropy and free enthalpy in the ternary solutions water+ glycin+ urea and water+ alanin + urea. The free enthalpy of transfer for the process: Amino acid from water to water+ urea, which can be derived from these measurements, does not agree with the value calculated from solubility measurements. The reason for this discrepancy and the values of entropy and enthalpy in terms of hydrophobic interaction are discussed. Supplementary measurements of the proton magnetic resonance in these solutions are included.

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On factors affecting surface free energy of carbon black for reinforcing rubber

Nanotechnology Reviews ◽

10.1515/ntrev-2020-0015 ◽

2020 ◽

Vol 9 (1) ◽

pp. 170-181 ◽

Cited By ~ 2

Author(s):

Shangyong Zhang ◽

Ruipeng Zhong ◽

Ruoyu Hong ◽

David Hui

Keyword(s):

Free Energy ◽

Carbon Black ◽

Surface Free Energy ◽

Surface Activity ◽

Gas Flow ◽

Influential Factors ◽

Chromatographic Column ◽

Factors Affecting ◽

Carrier Gas Flow

AbstractThe surface activity of carbon black (CB) is an important factor affecting the reinforcement of rubber. The quantitative determination of the surface activity (surface free energy) of CB is of great significance. A simplified formula is obtained to determine the free energy of CB surface through theoretical analysis and mathematical derivation. The surface free energy for four kinds of industrial CBs were measured by inverse gas chromatography, and the influential factors were studied. The results showed that the aging time of the chromatographic column plays an important role in accurate measurement of the surface free energy of CB, in comparison with the influences from the inlet pressure and carrier gas flow rate of the chromatographic column filled with CB. Several kinds of industrial CB were treated at high temperature, and the surface free energy of CB had a significant increase. With the increase of surface free energy, the maximum torque was decreased significantly, the elongation at break tended to increase, the heat generation of vulcanizates was increased, and the wear resistance was decreased.

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Determination of respiratory gas flow by electrical impedance tomography in an animal model of mechanical ventilation

BMC Pulmonary Medicine ◽

10.1186/1471-2466-14-73 ◽

2014 ◽

Vol 14 (1) ◽

Cited By ~ 6

Author(s):

Marc Bodenstein ◽

Stefan Boehme ◽

Stephan Bierschock ◽

Andreas Vogt ◽

Matthias David ◽

...

Keyword(s):

Mechanical Ventilation ◽

Animal Model ◽

Electrical Impedance Tomography ◽

Gas Flow ◽

Electrical Impedance ◽

Impedance Tomography

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Thermisches Verhalten von festem LaAlCl6 und chemischer Transport von LaCl3 mit AlCl3/Thermical Behaviour of Solid LaAlCl6 and Chemical Transport of LaCl3 with AlCl3

Zeitschrift für Naturforschung B ◽

10.1515/znb-1999-1113 ◽

1999 ◽

Vol 54 (11) ◽

pp. 1410-1416 ◽

Cited By ~ 4

Author(s):

H. Oppermann ◽

H. Dao Quoc ◽

A. Morgenstern

Keyword(s):

Total Pressure ◽

Chemical Transport ◽

Lanthanum Chloride ◽

Pressure Measurements ◽

Melting Diagram

The thermodynamical data of solid aluminium lanthanum chloride LaAlCl6 have been obtained by determination of the decomposition equilibria from total pressure measurements. The melting diagram was determined by DTA. The chemical transport of LaCl3 with AlCl3 is suggesting the existence of the gaseous complex LaAl3Cl12. The data are:ΔH(LaAlCl6f,298) =-427,1 ±2,5 kcal/mol, S°(LaAlCl6,f,298) = 61 ±2,5 cal/K-mol,Δ(LaAl3Cl12,g ,298) =-712 ± 7 kcal/mol, S°(LaAl3Cl12,g,298) = 205 ± 3 cal/K-mol.

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