All Optical Fiber Sensor based on Optically Stimulated Luminescence for radiation detection

International audienc

Thermodynamic properties of anhydrous smectite MX-80, illite Imt-2 and mixed-layer illite-smectite ISCz-1 as determined by calorimetric methods. Part I : Heat capacities, heat contents and entropies

International audienceThe heat capacities of the anhydrous international reference clay minerals, smectite MX-80, illite IMt-2 and mixed-layer illite–smectite ISCz-1, were measured by low temperature adiabatic calorimetry and differential scanning calorimetry, from 6 to 520 K (at 1 bar). The samples were chemically purified and Na-saturated. Dehydrated clay fractions <2 μm were studied. The structural formulae of the corresponding clay minerals, obtained after subtracting the remaining impurities, are ( ) for smectite MX-80, ( for illite IMt-2 and ( )for mixed-layer ISCz-1. From the heat capacity values, we determined the molar entropies, standard entropies of formation and heat contents of these minerals

Capteurs bio-chimiques Groupe I : capteurs chimiques a fibres optiques

Etude recouvrant les subventions 91-B-0270 a 91-B-0279 inclusesAvailable at INIST (FR), Document Supply Service, under shelf-number : AR 15533 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Thermodynamic properties of chlorite CCa-2. Heat capacities, heat contents and entropies

International audienceThe heat capacities of the international reference clay mineral chlorite CCa-2 from Flagstaff Hill, California, were measured by low temperature adiabatic calorimetry and differential scanning calorimetry, from 5 to 520 K (at 1 bar). The studied chlorite is a Fe-bearing trioctahedral chlorite with an intermediary composition between ideal clinochlore (Si3Al)(Mg5Al)O10(OH)8 and chamosite (Si3Al)(Fe5Al)O10(OH)8. Only few TiO2 impurities were detected in the natural chlorite sample CCa-2. Its structural formula, obtained after subtracting the remaining TiO2 impurities, is (Si2.633Al1.367)(Al1.116Mg2.952Mn0.012Ca0.011)O10(OH)8. From the heat capacity results, the entropy, standard entropy of formation and heat content of the chlorite were deduced. At 298.15 K, the heat capacity of the chlorite is 547.02 (±0.27) J mol−1 K−1 and the molar entropy is 469.4 (±2.9) J mol−1 K−1. The standard molar entropy of formation of the clay mineral from the elements is −2169.4 (±4.0) J mol−1 K−1