摘要 :
Low-temperature heat capacities of pyrimethanil decylate(C_(22)H_(33)N_3O_2)were precisely measured with an automated adiabatic calorimeter over the temperature range from 78 to 373 K.The sample was observed to melt at(311.04(+-)0...
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Low-temperature heat capacities of pyrimethanil decylate(C_(22)H_(33)N_3O_2)were precisely measured with an automated adiabatic calorimeter over the temperature range from 78 to 373 K.The sample was observed to melt at(311.04(+-)0.06)K.The molar enthalpy and entropy of fusion as well as the chemical purity of the compound were determined tobe(45876(+-)12)J/mol,(147.50(+-)0.05)J centre dot mol~(-1)centre dot K~(-1)and(99.21(+-)0.03)%(mass fraction),respectively.The extrapolated melting temperature for the absolutely pure compound obtained from fractional melting experiments is(311.204(+-)0.035)K.
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摘要 :
The birefringence grating and the surface grating in azobenzene polymer liquid-crystal (Azo-PLC) films are studied by a near-field scanning optical microscope. With laser irradiation, the refractive index change caused by birefrin...
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The birefringence grating and the surface grating in azobenzene polymer liquid-crystal (Azo-PLC) films are studied by a near-field scanning optical microscope. With laser irradiation, the refractive index change caused by birefringence and the sinusoidal surface profile are observed at the near-field transmittance image and the surface topography of the grating. The grating period and the peak-to-peak value of the sinusoidal surface profile are 0.8μm and 40 nm, respectively. The maximum diffractive efficiency of the grating is 2%. The dynamic process of the grating formation is probed and analysed. The mass diffusion responsible for the formation of the surface grating due to the temperature rise is analysed.
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