Method for researching standard molar formation enthalpy of barium molybdate nanometer material
A nanomaterial and barium molybdate technology, which is applied in the field of standard molar formation enthalpy of nanomaterials, can solve the problems of narrow application range, unsolved thermodynamic function value of nanomaterials, inapplicability of liquid phase reaction, etc., and achieves wide applicability and data acquisition. Accurate, fast, and easy-to-use effects
Inactive Publication Date: 2012-09-19
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 obtained through the reaction heat of the nanomaterial reaction system must be known. The standard molar enthalpy of formation of a 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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[0016] 1. At 298.15K and p θ Under the following conditions, a certain amount of barium molybdate nanomaterials 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 -0.15399J. The colorimetric tube was fixed to volume, and the barium ion concentration measured by ICP was 1.089mg / L, and the calculated amount of barium molybdate nanomaterials participating in the reaction was 7.92980×10 -8 mol, thus the molar reaction enthalpy of the nano-reaction system becomes -1941.9kJ / mol;
[0017] 2. At 298.15K and p θ A certain amount of bulk barium molybdate 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 -0.08500J. The colorimetric tube was fixed to volume, and the barium ion concentration measured by ICP was 1.514mg / L, and the calculated amount of bulk barium moly...
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The invention creatively provides a new thought of acquiring the standard molar formation enthalpy of nanometer material by searching for the relation between the standard molar formation enthalpies of barium molybdate nanometer material and corresponding block material on the basis of the known standard molar formation enthalpy of barium molybdate block material used as a reference standard. Based on the new thought, the invention further provides a new method for acquiring the standard molar formation enthalpy of nanometer material when the nanometer materials and corresponding block materials have the same chemical reaction under the same condition. Specifically, taking the reactions of barium molybdate block material and nanometer material with hydrochloric acids with the same concentration as an example, the acquired standard molar formation enthalpy of 298.15K and p theta barium molybdate nanometer material is -336.6kl / mol by using a high-precision high-sensitivity micro-calorimeter 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 barium molybdate nanomaterials, in particular to a method of using the known standard molar enthalpy of formation of barium molybdate bulk material as a reference standard to seek the standard molar formation enthalpy of nanomaterials and corresponding bulk materials. Enthalpy relationship, so as to obtain the standard molar formation enthalpy of nanomaterials. 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 values of nanomaterials through experiments, explore the scale, orientation (morphology) relationship and evolution law of nanomaterial thermodynamic functions, and establish basic thermodynamic data standards for nanomaterials ...
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IPC IPC(8): G01N25/20G01N21/71
Inventor 黄在银王路得谭学才郭云霄王腾辉
Owner GUANGXI UNIV FOR NATITIES