Thermoporometry by differential scanning calorimetry: experimental considerations and applications

Landry, Michael R.

doi:10.1016/j.tca.2005.02.015

Cited by 281 publications

(246 citation statements)

References 46 publications

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“…Temperature uncertainties were within ±0.03°C near 0°C, as inferred by testing isothermal melting of bulk ice. Referencing the temperature to the onset of ice melting (in a heating ramp) was avoided because of ice premelting (Dash et al 2006) and thermal lagging (Landry 2005).…”

Section: Methodsmentioning

confidence: 99%

“…The last step N is fully above 0°C; it does not melt any ice and, as the first step, only serves the determination of sample heat capacity, C N = Q N /dT N . The specific enthalpy q i is calculated by considering its dependence on temperature (Landry 2005),…”

Section: Theorymentioning

confidence: 99%

“…Thermoporometry (also named cryoporometry or thermoporosimetry) is based on the temperature depression of ice-water phase change inside pores (Petrov and Furó 2009). In the calorimetric version of the technique, TP-DSC, pore volumes are derived from measured heat flows due to phase transitions (Landry 2005).…”

Section: Introductionmentioning

confidence: 99%

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Dynamic vapor sorption and thermoporometry to probe water in celluloses

2012

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Dynamic vapor sorption and thermoporometry probe complementary dimensions of water interaction with cellulose. While sorption is primarily sensitive to the first hydration layers, thermoporometry is primarily sensitive to the nanometric water-filled pores. In this article, these analytical techniques are detailed and applied to model mesoporous materials and to a wide spectrum of celluloses. Correlations between techniques are explored. In dynamic vapor sorption, celluloses present a general characteristic time of desorption. On the other hand, they present highly variable characteristic times of sorption, indicating that material-specific properties may be inferred from sorption kinetics. Regarding thermoporometry, the thermodynamics of ice melting in irregular pore shapes is introduced. Moreover, in our thermoporometry analysis with differential scanning calorimeter, freezing temperature is extended to -70°C, allowing pores smaller than a few nanometers to be measured. Nevertheless, several data corrections are required for accurate thermoporometry at this condition. Comparisons between techniques show that sorption hysteresis is positively correlated with wet porosity. The presented developments and results will guide future application of these techniques to probe water in celluloses.

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Section: Methodsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Dynamic vapor sorption and thermoporometry to probe water in celluloses

2012

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“…For experimental observations, there is further the difficulty of reaching, maintaining and identifying equilibrium states. Clearly, the temperature ramps used in DSC and in other methods are of paramount importance, and the use of (too) high cooling or heating rates may give dubious results (Landry 2005).…”

Section: Green Wood and Fibre Saturationmentioning

confidence: 99%

A critical discussion of the physics of wood–water interactions

et al. 2012

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This paper reviews recent findings on wood-water interaction and puts them into context of established knowledge in the field. Several new findings challenge prevalent theories and are critically discussed in an attempt to advance current knowledge and highlight gaps. The focus of this review is put on water in the broadest concept of wood products, that is, the living tree is not considered. Moreover, the review covers the basic wood-water relation, states and transitions. Secondary effects such as the ability of water to alter physical properties of wood are only discussed in cases where there is an influence on state and/or transition.

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“…Another advantage of using water is that its heat of fusion, DH m = 334 Jg -1 , is up to an order of magnitude larger than the heat of fusion of most organic liquids. The large DH m enhances the sensitivity of the DSC technique and allows decreasing size of the studied samples [24].…”

Section: Introductionmentioning

confidence: 99%

Water thermoporosimetry as a tool of characterization of the textural parameters of mesoporous materials

Majda

Zimowska

Tarach

et al. 2016

J Therm Anal Calorim

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Water thermoporosimetry (TPM) is a powerful method for studying the properties of porous materials, devoted especially for investigation of the samples that can be destroyed in drying process. However, this method is not very popular and relatively rarely used because of problems with proper measurement procedure and choosing correct equation for the result interpretation. This report focused on refinement of general experimental protocols for water TPM. For the first time, the role of various parameters on the TPM outcomes was deeply investigated and simple and fast experimental mode was proposed. Additionally, based on the series of mesoporous silica SBA-15, the calibration procedure was employed and the reliable calibration equations were established.

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Thermoporometry by differential scanning calorimetry: experimental considerations and applications

Cited by 281 publications

References 46 publications

Dynamic vapor sorption and thermoporometry to probe water in celluloses

Dynamic vapor sorption and thermoporometry to probe water in celluloses

A critical discussion of the physics of wood–water interactions

Water thermoporosimetry as a tool of characterization of the textural parameters of mesoporous materials

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