Numerous theories have been developed for the determination of pore size distribution in adsorbent materials. The calculated pore size distribution is sensitive to the model selected for adsorption in slits, spheres, or cylinders and cannot be independently verified by experimental methods. Physical constants which are independent of theory can be determined from equilibrium thermodynamic exper...

The thermochemical properties for selected hydrogenated silicon clusters (Si(x)H(y), x = 3-13, y = 0-18) were calculated using quantum chemical calculations and statistical thermodynamics. Standard enthalpy of formation at 298 K and standard entropy and constant pressure heat capacity at various temperatures, i.e., 298-6000 K, were calculated for 162 hydrogenated silicon clusters using G3//B3LY...

Quantifying air–sea exchanges of enthalpy and momentum is important for understanding and skillfully predicting tropical cyclone intensity, but the magnitude of the corresponding wind speed–dependent bulk exchange coefficients is largely unknown at major hurricane wind speeds greater than 50 m s. Since direct turbulent flux measurements in these conditions are extremely difficult, the momentum ...

The p K(a) values of 6-fluoro-4,8-diazadodecane-1,12-diamine (6-fluorospermine) (1), 6,6-difluoro-4,8-diazadodecane-1,12-diamine (6,6-difluorospermine) (2), 6-fluoro-4-azaoctane-1,8-diamine (6-fluorospermidine) (3) and 6,6-difluoro-4-azaoctane-1,8-diamine (6,6-difluorospermidine) (4) in D(2)O solution have been determined at 40 degrees C from (13)C NMR chemical shifts data using the new compute...

The modified extended Hansen method was tested for the first time to determine partial solubility parameters of non-polymeric pharmaceutical excipients. The method was formerly tested with drug molecules, and is based upon a regression analysis of the logarithm of the mole fraction solubility of the solute against the partial solubility parameters of a series of solvents of different chemical c...

One of the effective thermochemical properties in determination heat process efficiency is combustion enthalpy changes during complete compounds. According to impor...

The interaction between bovine serum albumin (BSA) and methyl cinnamate (MC), an strawberry flavor compound, was investigated. We found that BSA and MC form complex with stoichiometry (n) equal 1, driven by system’s entropy increase and enthalpy reduce at pH 7.4, 5.0 and 3.5, with binding constants (Kb) in magnitude of 10 5 L.mol -1 . There was difference in variation of standard enthalpy of co...

In this research, the enthalpy of interaction cellulose and esters with various polar liquids was studied. Besides, standard enthalpies combustion formation its were determined. It shown that absolute value exothermic is an indicator accessibility supramolecular structure for these liquids. has been also established materials water, i.e., wetting enthalpy, directly proportional to content non-c...