Results 11 to 20 of about 4,671,197 (329)

Chemical Phenomena of Atomic Force Microscopy Scanning [PDF]

Analytical Chemistry, 2018
Atomic force microscopy is widely used for nanoscale characterization of materials by scientists worldwide. The long-held belief of ambient AFM is that the tip is generally chemically inert but can be functionalized with respect to the studied sample.
Petro Maksymovych, Joshua C. Agar, Olga S. Ovchinnikova, Gabriel Velarde, Chance Brown, Anton V. Ievlev, Matthew J. Burch, Lane W. Martin, Lane W. Martin, Sergei V. Kalinin   +9 more
openaire   +6 more sources

Does Augmented Reality Help to Understand Chemical Phenomena during Hands-On Experiments?-Implications for Cognitive Load and Learning

Multimodal Technologies and Interaction, 2023
Chemical phenomena are only observable on a macroscopic level, whereas they are explained by entities on a non-visible level. Students often demonstrate limited ability to link these different levels.
Hendrik Peeters, Sebastian Habig, Sabine Fechner   +2 more
semanticscholar   +1 more source

Process Optimization of Microwave-Assisted Extraction of Chlorophyll, Carotenoid and Phenolic Compounds from Chlorella vulgaris and Comparison with Conventional and Supercritical Fluid Extraction

Applied Sciences, 2023
The production of bioactive products from microalgae biomass with efficient and environmentally friendly technologies is a field of great research interest.
Ioulia Georgiopoulou, Soultana Tzima, Vasiliki Louli, Kostis Magoulas   +3 more
doaj   +1 more source

Recovery of Bioactive Extracts from Olive Leaves Using Conventional and Microwave-Assisted Extraction with Classical and Deep Eutectic Solvents

Separations, 2022
The recovery of phenolic compounds from olive leaves (Olea europaea L.) has received special attention due to their significant potential for applications in food, nutraceuticals, cosmetics, and pharmaceuticals.
Eleni Boli, Nikos Prinos, Vasiliki Louli, Georgia Pappa, Haralambos Stamatis, Kostis Magoulas, Epaminondas Voutsas   +6 more
doaj   +1 more source

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

Molecules, 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, Soultana Tzima, Vasiliki Louli, Kostis Magoulas   +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

Molecules, 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, Anna Zdziennicka, Katarzyna Szymczyk, Bronisław Jańczuk   +3 more
doaj   +1 more source

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

Kemija 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, Maamar Laidi, Salah Hanini, Mohamed Hentabli, Mohamed Benhelal   +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

Separations, 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, Vasiliki Louli, Kostis Magoulas   +2 more
doaj   +1 more source

Extraction of Bioactive Compounds from Ulva lactuca

Applied 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, Maria Myrto Dardavila, Maria G. Savvidou, Vasiliki Louli, Kostis Magoulas, Epaminondas Voutsas   +5 more
doaj   +1 more source

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

Вісник 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