Topic
Calorimeter
About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.
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TL;DR: A self-correcting indirect calorimetry system will be used to more accurately assess long-term measurements of energy balance in the many murine models of leanness and obesity to gain better insights into pathophysiology and treatment of human obesity.
Abstract: Indirect calorimetry involves measurement of CO2 produced and O2 consumed by an organism. These measurements are then used to calculate energy output, metabolic rate (MR), and respiratory quotient ...
24 citations
TL;DR: In this article, a flexible microreactor and measurement setup for exothermic chemical reactions in plate-type microreactors is presented, where precise heat flux measurement is realized by means of Seebeck elements and allows for direct as well as space and time-resolved heat flux determination across the reactor.
Abstract: A flexible reactor and measurement setup to safely obtain thermokinetic data for exothermic chemical reactions in plate-type microreactors is presented. Precise heat flux measurement is realized by means of Seebeck elements and allows for direct as well as space- and time-resolved heat flux determination across the reactor. The microreactor used in this work is manufactured from poly(vinylidene fluoride) foils and consists of 11 SZ-shaped mixing channel elements. The Seebeck elements are calibrated by the Joule effect, while its performance is demonstrated in heat transfer and neutralization reaction experiments. Furthermore, the local resolution enables an estimation of mixing time scale for rapid reactions. A comparison of obtained results indicates good accordance with literature data and is the base of further investigations using the calorimeter.
24 citations
TL;DR: In this article, a new calorimeter of the heatflow type designed to measure the differential heats of adsorption of gases on high surface area solids (e.g., catalysts) is described.
Abstract: A new calorimeter of the heat‐flow type designed to measure the differential heats of adsorption of gases on high surface area solids (e.g., catalysts) is described. Heat flow is measured using conventional thermopiles; the signals from which are amplified, digitized, and then sent to a laboratory computer for ease of data handling and analysis. The instrument allows conventional isotherm and heat data to be collected concomitantly. Other useful information obtained includes qualitative data regarding the rate at which processes take place, the total amount of gas chemisorbed, and the integrated value of the heat of adsorption. The instrument is capable of operating at temperatures from 273 to 373 K. One major advance over previous designs is that the dosing gas is allowed to thermally equilibrate before entering the sample chamber. The results of a simple study of the differential heats of adsorption of oxygen on a high surface area carbon material are presented. This study demonstrates the reliability and utility of the instrument.
24 citations
TL;DR: In this paper, an adiabatic calorimeter was used to measure the enthalpy of fusion of a very pure sample of gallium, which was determined to be ΔfusH = 80.097 ± 0.032 J·g-1, where the uncertainty corresponded to a 95% confidence interval.
Abstract: An adiabatic calorimeter was used to measure the enthalpy of fusion of a very pure sample of gallium. The new value of the enthalpy of fusion was determined to be ΔfusH = 80.097 ± 0.032 J·g-1, where the uncertainty corresponded to a 95% confidence interval. A comparison with previous determinations is made.
24 citations
TL;DR: In this article, a simple isothermal calorimeter ideal to study hydration of cementitious systems is described together with an ampoule design to allow addition of water and mixing with the pump inside.
Abstract: A simple isothermal calorimeter ideal to study hydration of cementitious systems is described together with an ampoule design to allow addition of water and mixing with the ampoule inside the calorimeter. An overview of dynamic corrections is given, and the utilisation of the different dynamic corrections on the calorimeter output is discussed. Correction of data on b-hemihydrate hydration to form gypsum has shown good kinetic agreement with data from synchrotron X-ray diffraction.
24 citations