Search

Your search keyword '"Materials Science and Nanoengineering (MSN) Department"' showing total 6 results
Start Over Author "Materials Science and Nanoengineering (MSN) Department"
6 results on '"Materials Science and Nanoengineering (MSN) Department"'

1. Insight into the structure-elastic property relationship of calcium silicate glasses: a multi-length scale approach

Author

Aurélien Canizares, Abdessamad Faik, Mohamed Naji, Yann Vaills, Othman El Kssiri, Patrick Simon, Sandra Ory, Mohammed Filali, LPAIS, University of Sidi Mohamed Ben Abdellah, Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université d'Orléans (UO), Materials Science and Nanoengineering (MSN) Department, and Université Mohammed VI Polytechnique

Subjects
Length scale, Materials science, Brillouin Spectroscopy, General Physics and Astronomy, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter::Disordered Systems and Neural Networks, 01 natural sciences, Silicate, Light scattering, 0104 chemical sciences, Brillouin zone, Molecular dynamics, chemistry.chemical_compound, symbols.namesake, chemistry, Chemical physics, Calcium silicate, symbols, Physical and Theoretical Chemistry, 0210 nano-technology, Raman spectroscopy
Abstract

Based on a combination of molecular dynamics simulations, and Raman and Brillouin light scattering spectroscopies, we investigate the structure and elastic properties relationship in an archetypical calcium silicate glass system. From molecular dynamics and Raman spectroscopy, we show that the atomic structure at the short and intermediate length scales is made up of long polymerized silicate chains, which adjusts itself by closing the Si–O–Si angles and leaving more space to [CaO]n edge shared polyhedra to strengthen the glass. Using Brillouin spectroscopy, we observe an increase of elastic constants of the glass with the calcium content, as the cohesion of the glass structure is enhanced through an increase of the binding between the cross-linked calcium-silicate frameworks. This result, albeit being simple in its nature, illustrates for the first time the implication of the calcium framework in the elastic behavior of the glass and will contribute substantially to the understanding of the composition–structure–property relationships in multi-component industrial glasses.

Published
2021
Full Text
View/download PDF

2. Bio-sourced porous cellulose microfibrils from coffee pulp for wastewater treatment

Author

Hicham Ben Youcef, V. Trabadelo, Mariana Ruesgas-Ramón, Nour-Elhouda Fayoud, Khalid Draoui, Mounir El Achaby, Maria-Cruz Figueroa-Espinoza, Materials Science and Nanoengineering (MSN) Department, Université Mohammed VI Polytechnique, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Laboratoire Matériaux et Systèmes Interfaciaux LMSI, Faculté Des Sciences, Université Abdelmalek Essaâdi (UAE), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Polymers and Plastics, caféier, microfibrille, Cellulose microfibrils, 02 engineering and technology, engineering.material, 010402 general chemistry, Coffee pulp waste, 01 natural sciences, chemistry.chemical_compound, Adsorption, [SDV.IDA]Life Sciences [q-bio]/Food engineering, Freundlich equation, microfibril, Cellulose, valorisation des sous produits, Porosity, fibre de cellulose, Aqueous solution, Pulp (paper), coffee tree, 021001 nanoscience & nanotechnology, 6. Clean water, 0104 chemical sciences, chemistry, Chemical engineering, Methylene blue adsorption, biomatériau, engineering, Microfibril, 0210 nano-technology, Mesoporous material, Hydrated cellulose
Abstract

The present work describes the production of novel highly hydrated cellulose microfibrils (CMFs) with unique morphology from coffee pulp waste using specific chemical treatments. The as-produced CMFs were successfully characterized and then used as an adsorbent for removal of methylene blue (MB) from concentrated aqueous solutions. Surprisingly, it was found that the novel CMFs display high water-uptake ability, with a maximum swelling ratio of 265%, and that they form an entangled hydrated network gel in water. The morphological observation and nitrogen adsorption measurement demonstrated that the extracted CMFs exhibit an average fibril diameter of 11.5 µm and mesoporous structure with an average pore size of 6.37 nm. These special features make the as-produced CMFs excellent candidates to be used as adsorbents for removal of MB from concentrated solutions. The performed adsorption studies determined that the adsorption equilibrium was reached within 90 min. The adsorption kinetics data were well fitted to the pseudo-second-order kinetic model, and the adsorption isotherms were well described by the Freundlich isotherm model. In addition, the maximum adsorption capacity was 182.5 mg/g, much higher than that determined for other previously reported cellulose-based adsorbents. Through this study, we have demonstrated a possible strategy to give an added value to the coffee pulp waste, a by-product of the coffee processing industry, which is rich in cellulose, inexpensive and renewable source. Indeed, the extracted CMFs are very attractive for developing a sustainable and economically viable bio-sourced material for future growth of cellulose use in advanced applications.

Published
2019
Full Text
View/download PDF

3. Mesoporous nanomaterials based on manganese with different interlayer alkali cations: An efficient approach for the removal of Pb(II) and Cd(II) from aqueous medium

Author

Jocelyne Leroy, Khaoula Khaless, Amina Amarray, Mouad Dahbi, M. Azzi, Sanae El Ghachtouli, Patrick Bonnaillie, Laboratoire Interface Matériaux et Environnement, Faculté des SCiences AînChock, Laboratoire Innovation en Chimie des Surfaces et NanoSciences (LICSEN UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of Chemical and Biochemical Sciences, Université Mohammed VI Polytechnique [Ben Guerir] (UM6P), Materials Science and Nanoengineering (MSN) Department, and Office Chérifien des Phosphates

Subjects
Birnessite, Process Chemistry and Technology, Metal ions in aqueous solution, Inorganic chemistry, chemistry.chemical_element, 02 engineering and technology, Manganese, [CHIM.MATE]Chemical Sciences/Material chemistry, 010501 environmental sciences, Alkali metal, 01 natural sciences, Nanomaterials, Adsorption, 020401 chemical engineering, chemistry, Reagent, 0204 chemical engineering, Safety, Risk, Reliability and Quality, Mesoporous material, Waste Management and Disposal, 0105 earth and related environmental sciences, Biotechnology
Abstract

International audience; The unique properties of nanomaterials provide a promising solution for environmental applications. Thus, three nanomaterials based on manganese birnessite-type in the form of well-structured nanowires and nanoflowers were synthesized by soft hydrothermal treatment, simple economical and without adding reagents or any other processes. Interlayer alkali cations (K+, H+ and Na+) inserted in the birnessite structure have demonstrated their effect on the structural and morphological properties of the nanomaterials and consequently on their metal ions removal efficiency. K-MnO2 nanowires with inserted K+ ions were characterized by high performance in short processing time (5 min) compared to other nanomaterials. The maximum adsorption quantities were respectively for Pb(II): K-MnO2 (300 mg/g)

Published
2021
Full Text
View/download PDF

4. Phosphorylated Micro- and Nanocellulose-Filled Chitosan Nanocomposites as Fully Sustainable, Biologically Active Bioplastics

Author

Mohammed Lahcini, Sara Blilid, Katarzyna Milowska, Emmanuel Belamie, Maria Bryszewska, Mounir El Achaby, Katarzyna Lisowska, Natalia Wrońska, Marta Kędzierska, Bruno Alonso, Nadia Katir, Abdelkrim El Kadib, Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, University of Lódź, Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Materials Science and Nanoengineering (MSN) Department, Université Mohammed VI Polytechnique, Euromed Research Center. Engineering Division [Fès], Université Euro Méditerranéenne de Fès (UEMF), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Cadi Ayyad [Marrakech] (UCA), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)

Subjects
Materials science, Nanocomposite, Renewable Energy, Sustainability and the Environment, General Chemical Engineering, Nanotechnology, General Chemistry, Bioplastic, Nanomaterials, Nanocellulose, Chitosan, chemistry.chemical_compound, chemistry, Environmental Chemistry, [CHIM]Chemical Sciences, Cellulose, ComputingMilieux_MISCELLANEOUS
Abstract

Controlled cellulose fragmentation and its downsizing to micro- and nanocrystals have recently captured tremendous attention to access sustainable nanomaterials. Hitherto, few functionalized cellul...

Published
2020
Full Text
View/download PDF

5. Inhibiting effect of textile wastewater on the activity of sludge from the biological treatment process of the activated sludge plant.

Author

Gebrati L, El Achaby M, Chatoui H, Laqbaqbi M, El Kharraz J, and Aziz F

Abstract

Textile industry represents an important source of toxic substances rejected in environment. Indeed, effluent of these industries contains dyes and chemicals. They are rejected in environment without any treatment. The aim of this work is to evaluate ecotoxicological effect of industrial textile effluents on the sludge harvested from activated sludge treatment plant of Marrakech city (Morocco). For this, we are interested in determining the inhibition condition that corresponds to 50% decrease of bacterial activity in sludge. Obtained results showed that inhibition percentage of bacterial activity depends narrowly on contact time and on added effluent volume, until a limit concentration where there is no degradation of substratum. In fact, substratum degradation speed shows about 65 times decrease when 80% (v/v) of textile wastewater is added, in comparison with the controlled one. Consequently the inhibition constant (Ki) that corresponds to 50% of bacterial inhibition activity is estimated to 0.65 mg l -1 of dye. These studies confirm a real ecotoxicological risk of these effluents. Therefore, a treatment is mandatory before their rejection in environment., (© 2018 Production and hosting by Elsevier B.V. on behalf of King Saud University.)

Published
2019
Full Text
View/download PDF

6. Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites.

Author

El Achaby M, Kassab Z, Aboulkas A, Gaillard C, and Barakat A

Subjects
Acids chemistry, Alkalies chemistry, Cellulose isolation & purification, Elastic Modulus, Hardness, Hydrolysis, Materials Testing, Nanocomposites ultrastructure, Nanoparticles ultrastructure, Temperature, Tensile Strength, Cellulose chemistry, Nanocomposites chemistry, Nanoparticles chemistry, Polyvinyl Alcohol chemistry, Rhodophyta chemistry, Waste Products
Abstract

Red algae is widely available around the world and its exploitation for the production of agar products has become an important industry in recent years. The industrial processing of red algae generates a large quantity of solid fibrous wastes, which constitutes a source of serious environmental problems. In the present work, the utilization of red algae waste as raw material to produce high-quality cellulose nanocrystals (CNC) has been investigated, and the ability of the as-isolated CNC to reinforce polymer has been studied. Red algae waste was chemically treated via alkali, bleaching and acid hydrolysis treatments, in order to obtain pure cellulose microfibers and CNC. The raw waste and the as-extracted cellulosic materials were successively characterized at different stages of treatments using serval analysis techniques. It was found that needle-like shaped CNC were successfully isolated at nanometric scale with diameters and lengths ranged from 5.2±2.9 to 9.1±3.1nm, and from 285.4±36.5 to 315.7±30.3nm, respectively, and the crystallinity index ranged from 81 to 87%, depending on the hydrolysis time (30, 40 and 80min). The as-extracted CNC were used as nanofillers for the production of polyvinyl alcohol (PVA)-based nanocomposite films with improved thermal and tensile properties, as well as optical transparency. It is shown that the addition of 8wt% CNC into the PVA matrix increased the Young's modulus by 215%, the tensile strength by 150%, and the toughness by 45%. Additionally, the nanocomposite films maintained the same transparency level of the neat PVA film (transmittance of ∼90% in the visible region), suggesting that the CNC were dispersed at the nanoscale., (Copyright © 2017 Elsevier B.V. All rights reserved.)

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results