Thermoporometry of porous carbon: The effect of the carbon surface chemistry on the thickness of non-freezable pore water layer (delta layer)

Zelenková, Gabriela; Zelenka, Tomáš; Slovák, Václav

doi:10.1016/j.micromeso.2021.111358

Cited by 17 publications

(6 citation statements)

References 19 publications

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“…However, it should be taken into consideration that the samples were lyophilised prior to the BJH measurement, and therefore the porous structure may have collapsed during the process, and the lower values of pore size obtained from BJH could partially be attributed to this drying technique, whereas the wet gels were used for the TPM. PSD for porous carbon was also lower in the case of gas adsorption versus TMP [ 92 ], but this phenomenon may be common to previous research, i.e., using materials in different states (dry vs. wet). Compared to SEM micrographs, the TPM method shows a good estimation for organic pyrolyzed aerogels [ 93 ].…”

Section: Thermoporometrymentioning

confidence: 77%

A Brief Evaluation of Pore Structure Determination for Bioaerogels

Horvat

Pantić

Knez

et al. 2022

Gels

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This review discusses the most commonly employed methods for determining pore size and pore size distribution in bioaerogels. Aerogels are materials with high porosity and large surface areas. Most of their pores are in the range of mesopores, between 2 and 50 nm. They often have smaller or larger pores, which presents a significant challenge in determining the exact mean pore size and pore size distribution in such materials. The precision and actual value of the pore size are of considerable importance since pore size and pore size distribution are among the main properties of aerogels and are often directly connected with the final application of those materials. However, many recently published papers discuss or present pore size as one of the essential achievements despite the misinterpretation or the wrong assignments of pore size determination. This review will help future research and publications evaluate the pore size of aerogels more precisely and discuss it correctly. The study covers methods such as gas adsorption, from which BJH and DFT models are often used, SEM, mercury porosimetry, and thermoporometry. The methods are described, and the results obtained are discussed. The following paper shows that there is still no precise method for determining pore size distribution or mean pore size in aerogels until now. Knowing that, it is expected that this field will evolve in the future.

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Section: Thermoporometrymentioning

confidence: 77%

A Brief Evaluation of Pore Structure Determination for Bioaerogels

Horvat

Pantić

Knez

et al. 2022

Gels

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“…The most straightforward use involves the agricultural application of this nutrition-rich substance to the soil as a soil amendment procedure [22]. Other applications include mercury capture from flue gas [23], air purification [24], drinking or wastewater treatment [25], adsorption chiller filling [26], and capture of radioactive substances [27].…”

Section: Introductionmentioning

confidence: 99%

Co-Gasification of Pistachio Shells with Wood Pellets in a Semi-Industrial Hybrid Cross/Updraft Reactor for Producer Gas and Biochar Production

Ryšavý,

Čespiva,

Kuboňová

et al. 2024

Fire

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The possibilities of pistachio shell biochar production on laboratory-scale gasification and pyrolysis devices have been described by several previous studies. Nevertheless, the broader results of the pistachio shell co-gasification process on pilot-scale units have not yet been properly investigated or reported, especially regarding the detailed description of the biochar acquired during the routine operation. The biochar was analysed using several analytical techniques, such as ultimate and proximate analysis (62%wt of C), acid–base properties analysis (pH 9.52), Fourier-transform infrared spectroscopy (the presence of –OH bonds and identification of cellulose, hemicellulose and lignin), Raman spectroscopy (no determination of Id/Ig ratio due to high fluorescence), and nitrogen physisorption (specific surface 50.895 m2·g−1). X-ray fluorescence analysis exhibited the composition of the main compounds in the biochar ash (32.5%wt of Cl and 40.02%wt of Na2O). From the energy generation point of view, the lower heating value of the producer gas achieved 6.53 MJ·m−3 during the co-gasification. The relatively high lower heating value of the producer gas was mainly due to the significant volume fractions of CO (6.5%vol.), CH4 (14.2%vol.), and H2 (4.8 %vol.), while hot gas efficiency accomplished 89.6%.

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“…They might be too brittle for mercury intrusion to be applied, exhibit severe structural changes upon drying or possess large pores so that gas sorption cannot be reliably performed. Under these circumstances, explorations of solid-liquid equilibria for structure determination, commonly referred to as thermoporometry, can be a perspective route [28][29][30][31][32][33][34][35][36][37]. Although the approach itself and the potentials it encodes, like capability to cover broader ranges of the pore sizes [38,39] or applicability to soft materials [40][41][42][43], are known, this method is not commonly used.…”

Section: Introductionmentioning

confidence: 99%

Advanced NMR Cryoporometry

Enninful

Enke

Valiullin

2023

Chemie Ingenieur Technik

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Accurate structural characterization of mesoporous solids is of importance for potential applications and for better understanding of properties of natural porous materials. Among different characterization techniques, thermoporometry has several beneficial features, such as applicability to wetted and soft materials. In this review, we discuss recent advancements concerning nuclear magnetic resonance cryoporometry allowing for a notable improvement of the accuracy of this method.

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Thermoporometry of porous carbon: The effect of the carbon surface chemistry on the thickness of non-freezable pore water layer (delta layer)

Cited by 17 publications

References 19 publications

A Brief Evaluation of Pore Structure Determination for Bioaerogels

A Brief Evaluation of Pore Structure Determination for Bioaerogels

Co-Gasification of Pistachio Shells with Wood Pellets in a Semi-Industrial Hybrid Cross/Updraft Reactor for Producer Gas and Biochar Production

Advanced NMR Cryoporometry

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