2. According to ionic conduction mechanism and the theory of host-guest supramolecular assemble, a novel series of Schiff base type crown ether polymers were synthesized for the first time by solution polycondensation of diformy-dibenzo-14-crown-4 and diamine, which complex with LiClO4 and prepare the SPE.
2. Utilizing the LbL self-assembly method with low-cost nanomicrometer titania particles as the raw material and as SiO_2 supports, successfully obtained nano-structure TiO_2/SiO_2 composite. The influence of times of assembling and assemble medium on the surface condition and content of TiO_2 were studied.
We select a [5-para-alkyloxyphenyl-10,15,20-tri(m-ethoxyphenyl)]porphyrin hydroxy rare earth complexes(HoOH) and 4,4′-bipyridine(44BPY) as the blocking units,and successfully assemble a HoOH monolayer on the 44BPY-modified silver surface based on axial ligation.
2. According to ionic conduction mechanism and the theory of host-guest supramolecular assemble, a novel series of Schiff base type crown ether polymers were synthesized for the first time by solution polycondensation of diformy-dibenzo-14-crown-4 and diamine, which complex with LiClO4 and prepare the SPE.
2. Utilizing the LbL self-assembly method with low-cost nanomicrometer titania particles as the raw material and as SiO_2 supports, successfully obtained nano-structure TiO_2/SiO_2 composite. The influence of times of assembling and assemble medium on the surface condition and content of TiO_2 were studied.
We select a [5-para-alkyloxyphenyl-10,15,20-tri(m-ethoxyphenyl)]porphyrin hydroxy rare earth complexes(HoOH) and 4,4′-bipyridine(44BPY) as the blocking units,and successfully assemble a HoOH monolayer on the 44BPY-modified silver surface based on axial ligation.
A series of the thermal chemical kinetic curves of sodium nitrate-bituminized waste system were obtained by means of thermal analysis equipments assembled by the authers, TG-DSC(Thermogravimetric-differential scanning calorimetric analyzer) and gas chromatography at 190
A series of the thermal chemical kinetic curves of sodium nitrate-bituminized waste system were obtained by means of thermal analysis equipments assembled by the authers, TG-DSC(Thermogravimetric-differential scanning calorimetric analyzer) and gas chromatography at 190
An experimental study of the tetrafluoroborate ion selcetive electrode based on PVC matrix membrane containing the quaternary ammonium salt and solvent mediator was described. Among the different quaternary ammonium salts and various solvents tested, triheptyldodeoylammonium (THDDA) tetrafluoroborate-di (ethylhexyl) phthalate (DEHP)-PVC membrane is the most attractive in respect to the electromotive behaviour of the corresponding electrodes. The optimum membrane composition is (w/w) 2% THDDA, 68% DEHP and 30%...
An experimental study of the tetrafluoroborate ion selcetive electrode based on PVC matrix membrane containing the quaternary ammonium salt and solvent mediator was described. Among the different quaternary ammonium salts and various solvents tested, triheptyldodeoylammonium (THDDA) tetrafluoroborate-di (ethylhexyl) phthalate (DEHP)-PVC membrane is the most attractive in respect to the electromotive behaviour of the corresponding electrodes. The optimum membrane composition is (w/w) 2% THDDA, 68% DEHP and 30% PVC.The following electrochemical cell was assembled to examine the response of the membrane,Ag-AgCl|0.01M NaBF_4, NaCl|PVC Membrane|Sample solution|3M KCl, 3% Agar|SCEThe response to BF_4~- ion is linear with a Nernstian slope (58.3mV/decade) over the concentration range 10~(-1) to 1×10~(-6) M in the pit range from 3.5 to 4.5 and the limit of detection is 8×10~(-7)M. But potential-pH curves showed that with the tetrafluoroborate concentration higher than 10~(-4)M, the membrane potential was independent of pH from 3 to 11.The coefficient of selectivity of various anions were determined and varied from 10~(-3) to 10~(-6), Only ClO_4~-, CNS~- and I~- anions showed remarkable interference.The response to change in BF_4~- concentrations in the range 10~(-1) to 10~(-4) was less than one minute. The electrode potential drift was less than 2 mV for the duration of eight hours period. The life time of the membranes is substantial. No change of characteristics whatsoever has been detected in this membrane, despite more than one year of continuous contact with water.
In order to observe and identify the intermediates and the change of the catalyst under reaction conditions, we have designed and assembled a high temperature and high pressure infrared spectrophotometer cell. The cell, constructed from stainless steel with NaCl or CaF3 windows, can withstanb 100 atm, and 200℃ The measurement system consists of autoclave, circulating pump and spectrophotometer cell. The infrared spectra are recorded using a Microlab-600 infrared spectrophotometer. The temperature and pressure...
In order to observe and identify the intermediates and the change of the catalyst under reaction conditions, we have designed and assembled a high temperature and high pressure infrared spectrophotometer cell. The cell, constructed from stainless steel with NaCl or CaF3 windows, can withstanb 100 atm, and 200℃ The measurement system consists of autoclave, circulating pump and spectrophotometer cell. The infrared spectra are recorded using a Microlab-600 infrared spectrophotometer. The temperature and pressure in the cell are the same as that in the autoclave, so that it can be used in ''in situ" tracing the behaviour of liquid, gase and liguid-gas mixtures.For the hydroformylation reaction of proplene with rhodium-phosphine complex catalyst, the transition of catalyst precursor Rh(acac) (CO) (PPh3) to active species RhH(CO)2(PPh3)3 has been recorded under the industrial reaction conditions (t =100℃, p=17atm. butyl aldehyde as solvent). If the pressure of synthetic gas is rather low, only RhH(CO) (PPh3) 3 can be identified. The active species RhH(CO)2(PPh3)2 disappears while the catalyst loses its reactivity. The oxidation of the ligand PPh3 and the formation of OPPh3 have been characterized under the oxygen atmosphere. In this case, the deactivation of catalysts, the formation of catalyst dimer, oxidation of proplene to acetone and the dynamics of CO oxidation to form CO2 have been traced.In this paper, the experimental method concerning the ''in situ" infrared tracing technique, high temperature and high pressure I. R spectrophotometer cell have been described and some experimental data and results have been given.