Method for researching standard molar formation enthalpy of short bar-shaped nanometer ZnO
A short rod-shaped technology that generates enthalpy, applied in measuring devices, instruments, and material analysis through electromagnetic means, can solve the problems of narrow application range, unresolved thermodynamic function values of nanomaterials, and inapplicability of liquid phase reactions, etc., reaching a wide range Applicability, accurate and fast data acquisition, and simple operation
Inactive Publication Date: 2012-10-24
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
[0021] 1. At 298.15K and p θ A certain amount of short rod-shaped 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 -0.51353J. The volume of the color tube was fixed, and the zinc ion concentration was measured by ICP to be 3.0225mg / L, so the molar reaction enthalpy of the nano reaction system was changed to -1100.82kJ / mol;
[0022] 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;
[0023] 3. According to the thermodynamic potential function method, the relationship between the ZnO nanometer reaction ...
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The invention initially provides a new thought for finding the relation between short bar-shaped nanometer ZnO and the standard molar formation enthalpy of blocky ZnO by taking the known standard molar formation enthalpy of the blocky ZnO as a reference standard to obtain the standard molar formation enthalpy of short bar-shaped nanometer ZnO. Based on the new thought, the invention further provides a new method for undergoing the same chemical reaction on the short bar-shaped ZnO and the blocky ZnO respectively under the same condition to obtain the standard molar formation enthalpy of the short bar-shaped ZnO. The standard molar formation enthalpy of the short bar-shaped nanometer ZnO of 298.15K below p theta is -87.21 kJ / mol according to a thermodynamical potential function method by using a high-accuracy and high-sensitivity micro calorimeter.
Description
technical field [0001] The present invention relates to a research on the standard molar enthalpy of formation of short rod-shaped 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 short rod-shaped nano-ZnO and the standard molar enthalpy of formation of bulk ZnO , so as to obtain the standard molar enthalpy of formation of short rod-shaped 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 ...
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IPC IPC(8): G01N25/48G01N27/62
Inventor 黄在银范高超陈洁马玉洁王腾辉
Owner GUANGXI UNIV FOR NATITIES