Results 11 to 20 of about 934,272 (151)

Supercritical CO2 Extraction of High-Added Value Compounds from Chlorella vulgaris: Experimental Design, Modelling and Optimization

open access: yesMolecules, 2022
Microalgae are well-known for their high-added value compounds and their recovery is currently of great interest. The aim of this work is the recovery of such components from Chlorella vulgaris through supercritical fluid extraction (SFE) with CO2.
Ioulia Georgiopoulou   +3 more
doaj   +1 more source

Thermodynamic Analysis of the Adsorption and Micellization Activity of the Mixtures of Rhamnolipid and Surfactin with Triton X-165

open access: yesMolecules, 2022
The surface tension of aqueous solutions of Triton X-165 with rhamnolipid or surfactin mixtures was measured. The obtained results were applied for the determination of the concentration and composition of the Triton X-165 and biosurfactants mixture at ...
Edyta Rekiel   +3 more
doaj   +1 more source

Problems of training scientific and pedagogical staff in chemistry in pre-revolutionary universities of Ukraine (19th – early 20th centuries)

open access: yesВісник Харківського національного університету: Серія xімія, 2021
The article identifies a number of problems that arose in the process of training students in chemistry at Ukrainian universities in the 19th – early 20th centuries.
Sergii Kulish
doaj   +1 more source

Extraction of Bioactive Compounds from Ulva lactuca

open access: yesApplied Sciences, 2022
Macroalgae Ulva lactuca, has been employed as a natural source for the production of extracts with potent bioactivity. The biochemical characterization showed that the macroalgae biomass contains a remarkable amount of the polysaccharide Ulvan (49.9 wt%)
Sofia Pappou   +5 more
doaj   +1 more source

Modelling the Drying Kinetics of Apple (Golab Variety): Fractional Calculus vs Semi-empirical Models [PDF]

open access: yesKemija u Industriji, 2021
In this work, two novel models have been proposed based on semi-empirical and factional calculus incorporating non-integer time derivatives in the Fick’s first law of anomalous diffusion.
Abdelkader Mahdad   +4 more
doaj   +1 more source

Comparative Study of Conventional, Microwave-Assisted and Supercritical Fluid Extraction of Bioactive Compounds from Microalgae: The Case of Scenedesmus obliquus

open access: yesSeparations, 2023
The recovery of bioactive products with green processes is a critical topic for the research and industry fields. In this work, the application of solid–liquid (SLE), microwave-assisted extraction (MAE) with aq.
Ioulia Georgiopoulou   +2 more
doaj   +1 more source

Electrochemical impedance spectroscopy as a diagnostic tool for passive direct methanol fuel cells

open access: yesEnergy Reports, 2022
Passive direct methanol fuel cells (pDMFCs) are a promising power source for portable electronic devices since they achieve higher power densities than the traditional batteries, and use a liquid fuel, methanol, which is easy to handle, storage and ...
B.A. Braz   +3 more
doaj   +1 more source

Artificial Neural Network Models for Prediction of Density and Kinematic Viscosity of Different Systems of Biofuels and Their Blends with Diesel Fuel. Comparative Analysis [PDF]

open access: yesKemija u Industriji, 2020
In the present article, two models based on the artificial neural network methodology (ANN) have been optimised to predict the density (ρ) and kinematic viscosity (μ) of different systems of biofuels and their blends with diesel fuel.
Souad Belmadani   +4 more
doaj   +1 more source

Behavior of Auramine O in the Aqueous Solution of Two Kolliphors and Their Mixture

open access: yesMolecules, 2022
The studies on the behavior of Auramine O (AuO) at the water–air interface and in the bulk phase of the aqueous solution of Kolliphor® ELP (ELP) and Kolliphor® RH 40 (RH40) and their mixture were based on the results obtained from the measurements of the
Katarzyna Szymczyk   +4 more
doaj   +1 more source

Vapor-liquid equilibrium of acid gases with imidazolium-based ionic liquids using the UMR-PRU model

open access: yesChemical Thermodynamics and Thermal Analysis, 2022
The UMR-PRU group contribution equation of state (EoS), which couples the Peng-Robinson EoS with UNIFAC via the Universal Mixing Rules, is extended to pure imidazolium-based ionic liquids (ILs), as well as to their mixtures with CO2 and H2S.
Anthoula Plakia   +3 more
doaj   +1 more source

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