Modulated differential scanning calorimetry MDSC

In this section, some case studies will be presented on the characterization of CMP pad and slurry [17-20] using such advanced analytical techniques as dynamic mechanical analysis (DMA), modulated differential scanning calorimetry (MDSC), thermal gravimetric analysis (TGA), thermal mechanical analysis (TMA), dynamic rheometry, dual emission laser induced fluorescence (DELIF), and the dynamic nuclear magnetic resonance (DNMR). More specifically, these techniques were used to characterize (a) the effect of heat... 

G.M. Wang and A.D.J. Haymet, Trehalose and other sugar solutions at low temperature modulated differential scanning calorimetry (MDSC), J. Phys. Chem. B, 1998, 102, 5341-5347. 

Modulated differential scanning calorimetry (MDSC) X-ray powder diffractometer (XRPD)... 

The latest development (1992) is the Modulated Differential Scanning Calorimetry (MDSC). Here the linear heating rate is superimposed by a sinoidal modulation. The following advantages of this mode are claimed direct measurement of heat capacity improved resolution of adjacent or superimposed effects improved sensitivity for weak transition effects separation of reversible from irreversible effects... 

TA Instruments (2005), Modulated Differential Scanning Calorimetry (MDSC ),TA Instruments Customer Training, June 2005. 

Modulated differential scanning calorimetry (MDSC) curves were obtained using a Universal V2.4F TA spectrometer. First scan MDSC heating curves were obtained by heating at 5 C min to the desired temperature. Second scan MDSC heating curves were obtained by first cooling the sample after the first heating in the instrument over ca. 17 min. The sample was then heated at 5 °C min to the desired temperature. 

Table 8-1. Latent Heats measured in pure 8CB by different techniques. A comparison of latent heats (error bars in parentheses) from Intensity fluctuation microscopy (IFM latent heats are estimated from the measured (/q = I.2 0.I) x 10 [66] and Landau parameters in [65]), Adiabatic Scanning Calorimetry (ASC errors from [69]) and Modulated differential scanning calorimetry (MDSC errors estimated from smaller error bar). Also listed is the molar fraction X of lOCB in 8CB-10CB (alkyl-cyanobiphenyl) mixtures at which the latent heat appears to vanish...

Lafouresse et al [67] and Sied et al [68] have used Modulated Differential Scanning Calorimetry (MDSC) to measure latent heats as a function of concentration in two liquid crystal mixtures (8CB-10CB and 80CB -lOOCB). In both cases, they obtain results quantitatively differing from previous calorimetry results. 

The glass transition of PETP samples which were subjected to solvent induced crystallisation (SINC) was investigated by modulated differential scanning calorimetry (MDSC) and density measurements. The differential heat capacity signal from MDSC was used to monitor the SINC process. 16 refs. 

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