Comparison of Specific Surface Areas of a Micronized Drug Substance as Determined by Different Techniques

Sautel, M.; Elmaleh, H.; Leveiller, F.

doi:10.1016/s0167-2991(00)80069-5

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…A six-station specific surface area analyzer was used to determine the specific surface area and pore size of activated carbon and zeolites (ASAP 2460, Micromeritics, Norcross, GA, USA) [32]. The zeta potential of the two adsorbents was determined using a zetapotential analyzer (ZS90, Malvern Instruments UK Ltd., Malvern, UK) with disposal folded capillary cells [33].…”

Section: Characterization Of Activated Carbon and Zeolitementioning

confidence: 99%

Temperature–Electrokinetic Co-Driven Perfluorooctane Sulfonic Acid (PFOS) Adsorption on Geo-Adsorbents

Yin

Shan

et al. 2023

Processes

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Per- and polyfluoroalkyl substances (PFAS) have concerned the public due to their worldwide distribution and the threat they pose to drinking water safety and human health. Temperature and DC field-induced electroosmotic flow (EOF) are powerful tools to regulate organic contaminant adsorption and control PFOS (as a typical PFAS) transport in porous media. However, the co-driven mechanisms of temperature–electrokinetic transport of contaminants are still unclear. Here, we investigated the synergistic mechanisms of temperature–electrokinetic co-driven PFOS adsorption on zeolite and activated carbon as model geo-adsorbents. We found that DC fields increased PFOS adsorption on activated carbon by up to 19.8%, while they decreased PFOS adsorption on zeolite by up to 21.4%. Increasing the temperature decreased the adsorption of PFOS by activated carbon and zeolite. The temperature and electrokinetic synergistically drive EOF velocity to control PFOS adsorption. Synergistic mechanisms of temperature–electrokinetic regulated kinetic and temperature-regulated thermodynamic (the Gibbs free energy change ΔG) and kinetic (liquid viscosity) under various temperatures and DC field situations were analyzed with models. A kinetic approach interlinking viscosity, EOF velocity, and the kinetic adsorption constants was established to interpret the synergistic mechanisms which can be further adopted to estimate temperature–electrokinetic induced PFOS adsorption benefits to mineral and carbonaceous adsorbents. We concluded that such kinetic regulation may provide support for controlling the transmission of PFOS.

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Section: Characterization Of Activated Carbon and Zeolitementioning

confidence: 99%

Temperature–Electrokinetic Co-Driven Perfluorooctane Sulfonic Acid (PFOS) Adsorption on Geo-Adsorbents

Yin

Shan

et al. 2023

Processes

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“…Compared to the dense and flat film, the nanofiber morphology greatly improves the rate of adsorption and desorption by increasing the effective contact volume with analyte molecules. Here, we introduce specific surface area (SSA) as a dimensionless parameter to explain the difference between flat and nanofibrous films [26,27].…”

Section: Simulation Model Of Finite Element Calculationmentioning

confidence: 99%

Nanofiber-Textured Organic Semiconductor Films for Field-Effect Ammonia Sensors

Yao

et al. 2022

IEEE Open J. Nanotechnol.

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Field-effect gas sensors, integrating the gas sensor and amplification transistor, exhibit excellent sensory performance.Here we report organic thin-film transistors (OTFTs) with nanofiber-textured semiconductor films that exhibit superior ammonia response compared to conventional OTFTs with uniform/flat semiconductor films. The introduce of insulating polymer additives (IPAs) facilitates the formation of semiconducting nanofiber during coating. The effects of IPAs, organic semiconductor/IPA blend ratios and solvents on OTFT-based sensory performance are studied. The results show that the use of SU8 as IPA and chloroform as solvent form intertwined semiconductor nanofibers (~50 nm in diameter) at the bottom. The resulting OTFTs exhibit extraordinarily high sensitivities to ammonia, which reach 13676%/ppm (current) and 457%/ppm (turn-on voltage), respectively. Finite element analysis was conducted to simulate the adsorption/desorption processes of gas molecules and the roles of specific surface area on sensory performance.

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