New method for researching one-dimensional nano ZnO standard molar formation enthalpy
A technology of generation enthalpy and nanometer, which is used in measurement devices, instruments, material analysis by electromagnetic means, etc. It can solve the problems of unsolved thermodynamic function value of nanomaterials, unsuitable liquid phase reaction, and narrow application range, and achieve data acquisition. Accurate and fast, wide applicability, simple operation effect
Inactive Publication Date: 2012-09-12
GUANGXI UNIV FOR NATITIES
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[0004] The problem with the above methods is that the entropy, enthalpy, and Gibbs free energy of nanomaterials obtained by measuring the low-temperature heat capacity are based on the standard state of 298.15K instead of 0K, so it does not solve the problem of nanomaterials in essence. The value of the specified thermodynamic function; the establishment and application of the theoretical model is only suitable for nanomaterials that meet specific conditions, so the scope of application is narrow; the standard molar enthalpy of formation of nanomaterials must be known through the reaction heat of the nanometer reaction system. The standard molar enthalpy of formation of each substance is not applicable to liquid phase reactions
At present, the idea and specific method of obtaining the standard molar enthalpy of formation of nanomaterials by using the known standard molar enthalpy of formation of bulk materials as a reference standard to seek the relationship between the standard molar enthalpy of formation of nanomaterials and corresponding bulk materials has not been reported yet.
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Embodiment 1
[0022] 1. At 298.15K and p θ Under the following conditions, a certain amount of one-dimensional nano-ZnO was reacted with excess hydrochloric acid with a concentration of 0.26mol / L and a volume of 1.5mL in a microcalorimeter, and the measured reaction enthalpy became -0.28552J. The volume of the color tube was fixed, and the zinc ion concentration was measured by ICP to be 2.1435 mg / L, so the molar reaction enthalpy of the nano-reaction system was changed to -870.89 kJ / mol;
[0023] 2. At 298.15K and p θ A certain amount of bulk ZnO was reacted with excess hydrochloric acid with a concentration of 0.26mol / L and a volume of 1.5mL in a microcalorimeter, and the measured reaction enthalpy became -0.21925J. The tube was fixed to volume, and the zinc ion concentration measured by ICP was 1.7070mg / L, thus the molar reaction enthalpy of the block reaction system was changed to -839.75kJ / mol;
[0024] 3. According to the thermodynamic potential function method, the relationship bet...
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The invention provides a new idea for obtaining weed-like nano ZnO standard molar formation enthalpy by seeking for relation between weed-like nano ZnO and blocky ZnO standard molar formation enthalpy according to a known blocky ZnO standard molar formation enthalpy serving as a reference standard for the first time. Based on the new idea, a new method for obtaining one-dimensional nano ZnO standard molar formation enthalpy is further provided by performing the same chemical reaction on the one-dimensional nano ZnO and the blocky ZnO under the same condition respectively. In the method, a high-accuracy and high-flexibility micro calorimeter is utilized, and the obtained standard molar formation enthalpy of the weed-like nano ZnO at 298.15K and p theta is -317.14kJ / mol according to a thermodynamic potential function method.
Description
technical field [0001] The present invention relates to a study on the standard molar enthalpy of formation of one-dimensional nano-ZnO, in particular to a method of using the known standard molar enthalpy of formation of bulk ZnO as a reference standard to seek the relationship between one-dimensional nano-ZnO and the standard molar enthalpy of formation of bulk ZnO , so as to obtain the standard molar enthalpy of formation of one-dimensional nano ZnO. Background technique [0002] The entropy, enthalpy, Gibbs free energy and other prescribed thermodynamic functions of nanomaterials have important scientific significance and application value, and are functions of scale and shape. How to obtain the specified thermodynamic function value of nanomaterials through experiments, explore the scale, orientation (morphology) relationship and evolution law of nanometer thermodynamic functions, and establish the basic thermodynamic data standard of nanomaterials with different sizes ...
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IPC IPC(8): G01N25/48G01N27/62G01N27/626
Inventor 黄在银范高超谭学才周泽广
Owner GUANGXI UNIV FOR NATITIES