Heat capacities, volumes and solubilities of pentanol in aqueous alkyltrimethylammonium bromides

Thermodynamic properties of aqueous 1-n-alkanepyridinium chlorides at temperatures from 283.15 K to 343.15 K

“…That choice can be ambiguous because m(cmc) is neither rigorously nor universally defined. However, we can calculate the difference (D r H* m − D r H°m) from equation (13) using the parameters in table 5 if we take m(cmc) as that molality where (1 2 a/1m 2 ) = 0. (19) The result of this calculation is shown in figure 13, from which it is evident that the largest differences between D r H* m and D r H°m are for surfactants with the smallest n-alkane moiety.…”

“…Values for C8PC (r) are based on our analysis of data from references 16 and 18 as described in the text. Error bars are our estimates of total uncertainties based on values in To use equation (13) to obtain D r H* m requires the choice of a value of m(cmc). That choice can be ambiguous because m(cmc) is neither rigorously nor universally defined.…”

“…FIGURE 13. Differences (DrH* m − DrH°m) between molar enthalpy changes at m = m(cmc) and in the standard state as functions of temperature T calculated from equation (13) with the parameters in tables 2, 3, and 5: r, C8PC; w, C10PC; q, C12PC; r, C14PC; t, C16PC.…”

“…(6)(7)(8)(9)(10)(11)(12)(13) The calibration constant was determined from measurements on NaCl(aq), and the total uncertainty in average values of f for surfactant solutions is estimated to range from 0.01 to 0.03. (12) All solutions used in the osmotic coefficient determinations were prepared by dilution of stock solutions.…”

Coadsorption of Naphthalene Derivatives and Cetyltrimethylammonium Bromide on Alumina/Water, Titanium Dioxide/Water, and Silica/Water Interfaces

“…A value of V sur f Å 0.362 which it will be applied. liter/mol was used (25). Equation [4] is presented in the b. Coadsorption results for NaphEtOH and NaphNH 2 on molar scale.…”