Modulated differential scanning calorimetry

Gill, P. S.; Sauerbrunn, Steve; Reading, M.

doi:10.1007/bf02546852

Cited by 490 publications

(221 citation statements)

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“…The total heat flow, which is the standard (non-modulated) DSC signal, is deconvoluted into reversing and non-reversing heat flows. 9,10 In the simplest case, the reversing heat flow ef0498667 arises from amorphous material. This signal was used to identify several T g s in bitumen.…”

Section: Resultsmentioning

confidence: 99%

Steric Hardening and the Ordering of Asphaltenes in Bitumen

2004

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1021/ef0498667 Energy & Fuels, 19, 1, pp. 120-122, 2005-01-01 Steric hardening and the ordering of asphaltenes in bitumen Masson, J-F.; Collins, P.; Polomark, G. M. Steric hardening and the ordering of asphaltenes in bitumenMasson, J-F.; Collins, P.; Polomark, G. NRCC-47288 AbstractSteric hardening is the hardening of bitumen over time at room temperature. It occurs after bitumen is melted and it often leads to poor reproducibility in standard testing.Modulated differential scanning calorimetry shows that asphaltenes order when bitumen is cooled from the melt and that this phenomenon is time dependent. This communication establishes the link between the ordering of the asphaltenes in bitumen and its steric hardening. It is suggested that at least 24 h elapse between the melting and pouring of bitumen and its subsequent testing by standardized methods.

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Section: Resultsmentioning

confidence: 99%

Steric Hardening and the Ordering of Asphaltenes in Bitumen

2004

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“…ADSC scans of all samples are taken at a 5°C min −1 scan rate and 1°C min −1 modulation rate. Glass transition temperatures are deduced from the inflection point of the reversing heat flow curves and crystallization peaks from the nonreversing curves; 9 typical error in the measurements is within ±2°C. Ag concentrations ͑x ജ 0.10͒, an important observation, which will be discussed later.…”

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confidence: 99%

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Pattanayak

Asokan

2004

Journal of Applied Physics

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Temperature modulated alternating differential scanning calorimetric studies show that Se rich Ge 0.15 Se 0.85−x Ag x ͑0 ഛ x ഛ 0.20͒ glasses are microscopically phase separated, containing Ag 2 Se phases embedded in a Ge 0.15 Se 0.85 backbone. With increasing silver concentration, Ag 2 Se phase percolates in the Ge-Se matrix, with a well-defined percolation threshold at x = 0.10. A signature of this percolation transition is shown up in the thermal behavior, as the appearance of two exothermic crystallization peaks. Density, molar volume, and microhardness measurements, undertaken in the present study, also strongly support this view of percolation transition. The superionic conduction observed earlier in these glasses at higher silver proportions is likely to be connected with the silver phase percolation.

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“…It is usually applied as temperature-modulated differential scanning calorimetry, TMDSC. 62 Figure 5(c) presents results establishing the limit of the reversibility of crystallization and melting of paraffins and polyethylenes. 49 For these experiments standard DSC and quasi-isothermal TMDSC were used.…”

Section: Molecular or Intramolecular Nucleationmentioning

confidence: 99%

“…68 commonly designated as RAF. With the development of TMDSC, 62 it became possible to separate latent heat effects from the heat capacity in the temperature range between T g and T m . Three important results arose from the application of this technique: First, it was found that many folded-chain crystals exhibit a certain amount of reversibility of melting.…”

Section: Nanophase Structure Of Macromolecules the Overall Phase Strumentioning

confidence: 99%

Thermodynamics and kinetics of crystallization of flexible molecules

Wunderlich

2008

J Polym Sci B Polym Phys

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Modulated differential scanning calorimetry

Cited by 490 publications

References 0 publications

Steric Hardening and the Ordering of Asphaltenes in Bitumen

Steric Hardening and the Ordering of Asphaltenes in Bitumen

Signature of a silver phase percolation threshold in microscopically phase separated ternary Ge0.15Se0.85−xAgx (⩽x⩽0.20) glasses

Thermodynamics and kinetics of crystallization of flexible molecules

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