logging in or signing up DIFFERENTIAL THERMAL ANALYSIS (DTA) ppt jacobshaise Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 251 Category: Education License: All Rights Reserved Like it (1) Dislike it (0) Added: November 15, 2011 This Presentation is Public Favorites: 1 Presentation Description DIFFERENTIAL THERMAL ANALYSIS (DTA) ppt Comments Posting comment... By: gemoo (5 month(s) ago) thanxxxxxxxxxxxxxxxx Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript DIFFERENTIAL THERMAL ANALYSIS (DTA): DIFFERENTIAL THERMAL ANALYSIS (DTA) Presented By Mr. Shaise Jacob Faculty Dept. of Pharmaceutical Analysis Nirmala College of Pharmacy Muvattupuzha, Kerala India E mail - jacobshaise@gmail.comThermal Analysis Techniques: Thermal Analysis Techniques When a material is heated its structural and chemical composition can undergo changes such as fusion, melting, crystallization, oxidation, decomposition, transition, expansion and sintering. Using Thermal Analysis such changes can be monitored in every atmosphere of interest. The obtained information is very useful in both quality control and problem solving. Types of thermal analysis : Types of thermal analysis TG (Thermogravimetric) analysis: weight DTA (Differential Thermal Analysis): temperature DSC (Differential ScanningCalorimetry): temperaturePowerPoint Presentation: In Differential Thermal Analysis , the temperature difference that develops between a sample and an inert reference material is measured, when both are subjected to identical heat - treatments . The related technique of Differential Scanning Calorimetry relies on differences in energy required to maintain the sample and reference at an identical temperature.Thermogravimetry (TG): Thermogravimetry (TG) Thermogravimetry is the measurement of the mass of a sample as the temperature increases. This method is useful for determining sample purity and water, carbonate, and organic content; and for studying decomposition reactions.INTRODUCTION: INTRODUCTION This is a comparison method Analytical method for recording the difference in temperature (∆T) b/w a substance and an inert reference material as a function of temperature or time Any transformation – change in specific heat or an enthaply of transition can be detected by DTAPowerPoint Presentation: In DTA both test sample & an inert reference material (alumina) – controlled heating or cooling programming If zero temperature difference b/w sample & reference material – sample does not undergo any chemical or physical change. If any reaction takes place temperature difference (∆T) will occur b/w sample & reference materialPowerPoint Presentation: A DTA curve can be used as a finger print for identification purposes, for example, in the study of clays where the structural similarity of different forms renders diffraction experiments difficult to interpret.PowerPoint Presentation: ∆T VS Temp. Sharp Endothermic – changes in crystallanity or fusion Broad endotherms - dehydration reaction Physical changes usually result in endothermic curves Chemical reactions are exothermicApparatus: Apparatus The key features of a differential thermal analysis kit are as follows 1. Sample holder comprising thermocouples, sample containers and a ceramic or metallic block. 2. Furnace. 3. Temperature programmer. 4. Recording system.PowerPoint Presentation: Heart of the analysis – heating block Identical pair of cavities for the sample, ref. material Whole unit is set in an oven- control pressure Thermocouple is place directly in contact with the sample and another in contact with the reference Temp.of the block is raised, the temperature of the sample & reference follow Zero temp. difference – no physical or chemical change If any reaction – difference in ∆TPowerPoint Presentation: Differential Thermal Analysis advantages: instruments can be used at very high temperatures instruments are highly sensitive characteristic transition or reaction temperatures can be accurately determined disadvantages: uncertainty of heats of fusion, transition, or reaction estimations is 20-50% DTAFactors affect results in DTA: Factors affect results in DTA Sample weight Particle size Heating rate Atmospheric conditions Conditions of sample packing into dishesApplications: Applications Quantitative identification and purity assessment of materials are accomplished by comparing the DTA curve of sample to that of a reference curve Impurities may be detected by depression of the M.P You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
DIFFERENTIAL THERMAL ANALYSIS (DTA) ppt jacobshaise Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 251 Category: Education License: All Rights Reserved Like it (1) Dislike it (0) Added: November 15, 2011 This Presentation is Public Favorites: 1 Presentation Description DIFFERENTIAL THERMAL ANALYSIS (DTA) ppt Comments Posting comment... By: gemoo (5 month(s) ago) thanxxxxxxxxxxxxxxxx Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript DIFFERENTIAL THERMAL ANALYSIS (DTA): DIFFERENTIAL THERMAL ANALYSIS (DTA) Presented By Mr. Shaise Jacob Faculty Dept. of Pharmaceutical Analysis Nirmala College of Pharmacy Muvattupuzha, Kerala India E mail - jacobshaise@gmail.comThermal Analysis Techniques: Thermal Analysis Techniques When a material is heated its structural and chemical composition can undergo changes such as fusion, melting, crystallization, oxidation, decomposition, transition, expansion and sintering. Using Thermal Analysis such changes can be monitored in every atmosphere of interest. The obtained information is very useful in both quality control and problem solving. Types of thermal analysis : Types of thermal analysis TG (Thermogravimetric) analysis: weight DTA (Differential Thermal Analysis): temperature DSC (Differential ScanningCalorimetry): temperaturePowerPoint Presentation: In Differential Thermal Analysis , the temperature difference that develops between a sample and an inert reference material is measured, when both are subjected to identical heat - treatments . The related technique of Differential Scanning Calorimetry relies on differences in energy required to maintain the sample and reference at an identical temperature.Thermogravimetry (TG): Thermogravimetry (TG) Thermogravimetry is the measurement of the mass of a sample as the temperature increases. This method is useful for determining sample purity and water, carbonate, and organic content; and for studying decomposition reactions.INTRODUCTION: INTRODUCTION This is a comparison method Analytical method for recording the difference in temperature (∆T) b/w a substance and an inert reference material as a function of temperature or time Any transformation – change in specific heat or an enthaply of transition can be detected by DTAPowerPoint Presentation: In DTA both test sample & an inert reference material (alumina) – controlled heating or cooling programming If zero temperature difference b/w sample & reference material – sample does not undergo any chemical or physical change. If any reaction takes place temperature difference (∆T) will occur b/w sample & reference materialPowerPoint Presentation: A DTA curve can be used as a finger print for identification purposes, for example, in the study of clays where the structural similarity of different forms renders diffraction experiments difficult to interpret.PowerPoint Presentation: ∆T VS Temp. Sharp Endothermic – changes in crystallanity or fusion Broad endotherms - dehydration reaction Physical changes usually result in endothermic curves Chemical reactions are exothermicApparatus: Apparatus The key features of a differential thermal analysis kit are as follows 1. Sample holder comprising thermocouples, sample containers and a ceramic or metallic block. 2. Furnace. 3. Temperature programmer. 4. Recording system.PowerPoint Presentation: Heart of the analysis – heating block Identical pair of cavities for the sample, ref. material Whole unit is set in an oven- control pressure Thermocouple is place directly in contact with the sample and another in contact with the reference Temp.of the block is raised, the temperature of the sample & reference follow Zero temp. difference – no physical or chemical change If any reaction – difference in ∆TPowerPoint Presentation: Differential Thermal Analysis advantages: instruments can be used at very high temperatures instruments are highly sensitive characteristic transition or reaction temperatures can be accurately determined disadvantages: uncertainty of heats of fusion, transition, or reaction estimations is 20-50% DTAFactors affect results in DTA: Factors affect results in DTA Sample weight Particle size Heating rate Atmospheric conditions Conditions of sample packing into dishesApplications: Applications Quantitative identification and purity assessment of materials are accomplished by comparing the DTA curve of sample to that of a reference curve Impurities may be detected by depression of the M.P