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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: An isothermal, isobaric, flow calorimeter suitable for measuring either endothermic or exothermic heats of mixing from 273 to 423 K and from 01 to 405 MPa is described in this paper.
Abstract: An isothermal, isobaric, flow calorimeter suitable for measuring either endothermic or exothermic heats of mixing from 273 to 423 K and from 01 to 405 MPa is described Energy effects from 015 to 30 J/min can be measured to an accuracy of ±05% for standard test systems at a constant temperature through the use of an automatically controlled heater and a constant cooling Peltier device The calorimeter was tested by measuring the heat of mixing of water‐ethanol at 383 K and 1 MPa and was found to produce data in good agreement with published literature values
46 citations
TL;DR: In this article, the authors describe a high-precision microcalorimetric measurement system using a heat-conduction type and utilizes semi-conductor thermoelectric modules.
Abstract: Apparatus and procedures used for high-precision microcalorimetric measurements are described. The calorimeter is of the heat-conduction type and utilizes semi-conductor thermoelectric modules. The bicompartmental reaction vessel is made of high-density polyethylene and holds about 0.5 mL of solution in each compartment. Imprecision of heat measurement is 0.2 percent when measuring 300 mJ of heat produced by a rapid chemical reaction. Three microcalorimeters are operated simultaneously using a microcomputer and a data acquisition system. Thermochemical and kinetic applications are described. The acquisition of data from an isoperibol solution calorimeter is also described.
45 citations
IBM1
TL;DR: In this paper, the use of pyroelectric polyvinylidene fluoride calorimeters for the measurement of thermal diffusivities of thin films is described, and the potential of this detection scheme combined with photothermal excitation is demonstrated on polymer films with thickness in the 1 μm range.
Abstract: The use of pyroelectric polyvinylidene fluoride calorimeters for the measurement of thermal diffusivities of thin films is described. The potential of this detection scheme combined with photothermal excitation is demonstrated on polymer films with thickness in the 1 μm range.
45 citations
TL;DR: In this paper, the authors used differential scanning calorimetry to measure the heat capacity of diamond-like carbon (DLC) film prepared by a plasma immersion ion processing method.
Abstract: We have used differential scanning calorimetry to measure the heat capacity of diamond-like carbon (DLC) film prepared by a plasma immersion ion processing method. The same calorimeter was used to measure the heat capacity of single crystal natural diamond and of high purity graphite. The amount of atomic hydrogen trapped in the DLC films was determined by elastic-recoil-detection spectrometry. The present data and literature values were used to deduce an expression for the specific heat that factors out the contribution from the sp3/sp2 bonding and from the atomic hydrogen trapped in the carbon. The data shows that the hydrogen contribution to the specific heat of carbon is independent of the sp3/sp2 bonding and amounts to about 0.63kB per hydrogen atom. We propose a simple method to determine the sp3/sp2 bonding ratio in hydrogenated DLC films based on measuring the specific heat and the hydrogen content of the sample.
45 citations
TL;DR: In this paper, the authors described experiments with temperature-modulated calorimetry, in which use is made of multiple modulation frequencies for the evaluation of the heat capacity, and showed that the extrapolation of heat capacity from the amplitudes of the first and higher harmonics of the Fourier-transforms of heat-flow rate and heating rate allowed the correct heat capacity to be obtained from a single experiment.
45 citations