THE DEVELOPMENT OF A CRYOGENIC CALORIMETRIC SYSTEM FOR STUDYING THE STATE OF LIQUIDS IN INHOMOGENEOUS MATERIALS

2021 ◽  
Vol 43 (2) ◽  
pp. 84-90
Author(s):  
S.O. Ivanov ◽  
L.V. Dekusha ◽  
L.Y. Vorobiov ◽  
O.L. Dekusha
Keyword(s):  
Differential Scanning Calorimetry ◽  
Experimental Studies ◽  
Heterogeneous Materials ◽  
The State ◽  
Measuring System ◽  
Organic Liquids ◽  
Inhomogeneous Materials ◽  
Scanning Calorimetry ◽  
Calorimetric System ◽  
Representative Samples

The analysis of methods and means of experimental determination of the ratio of free and bound moisture in materials is carried out, and it is shown that most of the available measuring instruments do not allow investigating the ratio of free and bound moisture on representative samples of heterogeneous materials, therefore there is a need to create a specialized device for these purposes. Thus, the concerned work is aimed to the development of the differential scanning calorimetry method for studying the state of liquids in inhomogeneous materials and the creation of a cryogenic calorimetric system for the implementation of this method. On the basis of the performed analysis, recommendations were formulated for the development of a measuring system that is capable of examining representative samples of heterogeneous materials of various structures without the need for their preliminary grinding. The method of differential scanning calorimetry has been improved for studying the state of water and organic liquids in inhomogeneous materials in a wide temperature range, which is based on the use of a three-cell differential measurement scheme, as well as the use of cells, the configuration of which allows taking into account the peculiarities of inhomogeneous raw materials. A prototype of a cryogenic calorimetric system has been created, and a method for studying the metrological characteristics of such a system has been developed. On the basis of experimental studies, it has been established that the limits of the permissible relative measurement error of using the developed cryogenic calorimetric system are ± 5%, which corresponds to world analogues.

scholarly journals Determining Thermal Conductivity of Small Molecule Amorphous Drugs with Modulated Differential Scanning Calorimetry and Vacuum Molding Sample Preparation

Pharmaceutics ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 670 ◽  
Author(s):  
Maximilian Karl ◽  
Jukka Rantanen ◽  
Thomas Rades
Keyword(s):  
Thermal Conductivity ◽  
Differential Scanning Calorimetry ◽  
Sample Preparation ◽  
Small Molecule ◽  
Specific Property ◽  
Organic Liquids ◽  
Preparation Technique ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Vacuum Molding

Thermal conductivity is a material specific property, which influences many aspects of pharmaceutical development, such as processing, modelling, analysis, and the development of novel formulation approaches. We have presented a method to measure thermal conductivity of small molecule organic glasses, based on a vacuum molding sample preparation technique combined with modulated differential scanning calorimetry. The method is applied to the two amorphous model compounds indomethacin and celecoxib. The measured values of below 0.2 W/m °C indicate very low thermal conductivity of the amorphous compounds, within the range of organic liquids and low conducting polymers.

Investigation of the forms of moisture binding in the grain of triticale of the Gorka variety by the method of thermal analysis

2021 ◽  
Vol 30 (4) ◽  
pp. 44-47
Author(s):  
T. N. Tertychnaya ◽  
◽  
I.V. Kuznetsova ◽  
A.A. Shevtsov ◽  
S.S. Kulikov ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Sample Preparation ◽  
Experimental Studies ◽  
Thermal Exposure ◽  
Whole Grains ◽  
Thermal Impact ◽  
Scanning Calorimetry ◽  
Synchronous Thermal Analysis

The work carried out experimental studies of Gorka triticale grain using differential scanning calorimetry (DSC) and thermogravimetry (TG) methods. To study the patterns of thermal impact on grain samples, a synchronous thermal analysis device (TG-DTA/DSC) of the STA 449 F3 Jupiter model was used. The importance of sample preparation for analysis with ground and whole grains was noted. The obtained relationships made it possible to distinguish periods of dehydration of water and conversion of dry substances during thermal exposure to triticale grain, as well as to identify temperature zones that correspond to the release of moisture with various forms and energy of communication.

scholarly journals Effect of heat treatment on the structure and magnetic properties of Sm-Fe alloys obtained by mechanical alloying

2018 ◽  
Vol 44 ◽  
pp. 00072
Author(s):  
Nikolay Razumov ◽  
Aleksandr Verevkin
Keyword(s):  
Heat Treatment ◽  
Differential Scanning Calorimetry ◽  
Magnetic Properties ◽  
Mechanical Alloying ◽  
Isothermal Holding ◽  
Experimental Studies ◽  
Magnetic Characteristics ◽  
Scanning Calorimetry ◽  
Fe Alloys ◽  
Holding Temperature

The effect of heat treatment on the structure and magnetic properties of Sm-Fe alloys obtained by mechanical alloying was investigated. The crystallization temperature of Sm2Fe17, an amorphous alloy obtained by mechanical alloying, was determined using differential scanning calorimetry. Based on these results, various samples were annealed at different isothermal holding temperatures, and those with the best magnetic properties were found. Experimental studies show that decreasing the isothermal holding temperature from 750 °C to 630 °C increases magnetic characteristics nearly four times. The saturation magnetization, romance and coercivity of the Sm2Fe17 powder were 121 emu/g, 28.5 emu/g and 800 Oe, respectively.

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