The determination of the osmotic coefficients of the aqueous solution of polyhydroxylated compounds such as glycol, glycerol, sucrose and glucose by Vapour PressureOsmometry at 313, 323 and 333K was carried out over t...The determination of the osmotic coefficients of the aqueous solution of polyhydroxylated compounds such as glycol, glycerol, sucrose and glucose by Vapour PressureOsmometry at 313, 323 and 333K was carried out over the concentration range of 0.0-2.1mol.kg-1 and 0.0-2.0 mol.kg-1 respectively. By using a linear least-square fitting routine,the osmotic coefficients were fitted by a simPle polynomial equation, It was found thatthe relation between the experimental results of molal osmotic coefficients and the massmolal concentration of the solution m are in agree with that from the polynomial fit-ting at different temperature. Factors which imldence the osmotic coefficient such as thenumber of hydroxyl of polyhydroxylated compounds or the molecule weight of the solutemolecules should be further studied, this work will also contribute to the studies of otherthermodynamical properties of the aqueous solution of polyhydroxylated compound.展开更多
The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were...The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were greatly improved at CNT/GC,indicating that the redox of hydroquinone could be catalyzed at CNT/GC.The kinetic parameters of thisprocess were calculated.The diffusiong coefficient was 1.7×10-5cm2·s-1,the heterogeneouselectron transfer rate constant k was 0.678s-1,α value was 0.538 and electron transfer numbers was 2.展开更多
文摘The determination of the osmotic coefficients of the aqueous solution of polyhydroxylated compounds such as glycol, glycerol, sucrose and glucose by Vapour PressureOsmometry at 313, 323 and 333K was carried out over the concentration range of 0.0-2.1mol.kg-1 and 0.0-2.0 mol.kg-1 respectively. By using a linear least-square fitting routine,the osmotic coefficients were fitted by a simPle polynomial equation, It was found thatthe relation between the experimental results of molal osmotic coefficients and the massmolal concentration of the solution m are in agree with that from the polynomial fit-ting at different temperature. Factors which imldence the osmotic coefficient such as thenumber of hydroxyl of polyhydroxylated compounds or the molecule weight of the solutemolecules should be further studied, this work will also contribute to the studies of otherthermodynamical properties of the aqueous solution of polyhydroxylated compound.
文摘The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were greatly improved at CNT/GC,indicating that the redox of hydroquinone could be catalyzed at CNT/GC.The kinetic parameters of thisprocess were calculated.The diffusiong coefficient was 1.7×10-5cm2·s-1,the heterogeneouselectron transfer rate constant k was 0.678s-1,α value was 0.538 and electron transfer numbers was 2.
