Naceur Belgacem

Naceur Belgacem
Grenoble Institute of Technology | Grenoble INP · Paper Science, Print Media and Biomaterials

PhD

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448
Publications
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Introduction
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Publications

Publications (448)
Article
Full-text available
Cellulose phosphorylation as a pretreatment for CNF production is a robust process allowing to modify the surface charge of the fiber. However, cellulose phosphorylation is associated with a yellowing of the substrate and variations in the grafting of phosphate groups leading to crosslinking during intense curing. In this study, a design of experim...
Article
Full-text available
The development of composite materials with fewer interface problems always helps to obtaining good properties. Two types of insulating biopolymers (7% w/w) were incorporated into a conductive matrix (polyaniline) during polymerization. The synthesis method, inspired by the synthesis of polyaniline and the coating of chitosan for the development of...
Article
Full-text available
Abiotic 3D-printed cathodes for biofuel cells were manufactured using chitosan-cellulose nanofibres-iron doped graphene hydrogels and the cold material extrusion (MEX) 3D printing technique. The subsequent pyrolysis under ammoniac flux and in-situ n-doping of 3D cathodes led to the generation of conductive 3D electrodes with macroporosity that can...
Article
Full-text available
In this research it was analyzed the possibility of producing handmade papers with good properties from mixtures of recycled fibers with kraft pulps of bamboo (Dendrocalamus giganteus) and sugar-cane bagasse (Saccharum officinarum). Handmade papers with higher folding endurance and tear strength were produced with the mixtures whose compositions ha...
Article
This paper discusses mucilage extracted from Opuntia ficus-indica (Cactaceae) cladodes, also known as Barbary fig. Mucilaginous polysaccharides were extracted in hot water and purified with two distinct organic solvents, ethanol and isopropanol. The mucilaginous extract yield precipitated in isopropanol "MUIS″ (i.e. 23.2%) is higher than that of et...
Article
Full-text available
3D printing has recently triggered huge attention in several fields such as construction, artificial tissue engineering, food fabrication, wearable electronics, and electrochemical energy storage. This work investigates the fabrication of a 3D-printed abiotic cathode for implantable glucose/oxygen biofuel cells. The ink formulation was optimized t...
Article
This study evaluated the feasibility of using cactus mucilage (CM) to elaborate biobased composite films blended with styrene-butadiene rubber latex (SBL). The CM was extracted and precipitated with ethanol (CMET) and isopropanol (CMIS). Mucilage-based films were formulated using three levels of mucilage (4, 6, and 8 wt%). The microstructure, thick...
Chapter
Full-text available
Schinus molle L. is a part of the Anacardiaceae family originates from South America and expanded in Mediterranean region and Africa. Many researches have examined the morphological and physicochemical properties of this plant. Some reviews and primary scientific studies were undertaken to identify this species which are used in traditional treatme...
Poster
Full-text available
Two resins were prepared from Stipa tenacissima L. and their physical and chemical behaviors were evaluated. The resins were produced by modification of extracted lignin from the S. tenacissima L. using phenolation reaction (resorcinol). Glyoxal and formaldehyde as cross-linking agents were employed to produce lignin-glyoxal resin and lignin-resorc...
Article
In this work, nanofibrillated cellulose (NFC) was extracted from cactus Cereus jamacaru DC. (mandacaru) for nanopaper production. The technique adopted includes alkaline treatment, bleaching, and grinding treatment. The NFC was characterized according to its properties and scored based on a quality index. Particle homogeneity, turbidity, and micros...
Article
Full-text available
Implantable devices powered by batteries have been used for sixty years. In recent devices, lithium-based batteries are the most widely used power source. However, lithium batteries have many disadvantages in terms of safety, reliability, and longevity and require regular monitoring and substitution. Implantable glucose biofuel cells (BFCs) are inc...
Article
Full-text available
Despite the many existing fibrillation processes for the production of cellulose nanofibrils (CNFs), their exact destructuration effects on fibers remain poorly understood. This work reports the use of disk refining, twin-screw extrusion (TSE), ultra-fine grinding and homogenization for CNF production, alone or in combinations. The same raw materia...
Article
Full-text available
Schinus molle (SM) was investigated as a primary source of cellulose with the aim of discovering resources to generate cellulose nanofibers (CNF). The SM was put through a soda pulping process to purify the cellulose, and then, the fiber was treated with an enzymatic treatment. Then, a twin-screw extruder and/or masuko were utilized to help with fi...
Article
Full-text available
Hydrophobic nanofibrilated cellulose (NFC) films were prepared by the casting of a mixture of NFC suspension in an aqueous emulsion of two blocked isocyanates - one prepared by the reaction of 4,4’- methylenebis (phenyl isocyanate) and phenol (MDI-2Ph) and a commercial one from trimethylol propane and toluene diisocyanate (Desmodur AP Stabil®) (TMP...
Article
Natural biopolymers have become key players in the preparation of biodegradable food packaging. However, biopolymers are typically highly hydrophilic, which imposes limitations in terms of barrier properties that are associated with water interactions. Here, we enhance the barrier properties of biobased packaging using multilayer designs, in which...
Article
This study aimed to evaluate the properties of cellulose nanofibers (CNFs) with different hemicellulose contents and cellulose II polymorphs. A link was found between these polysaccharides and the properties of CNFs. A decrease in crystallinity (from 69 to 63%) and changes in the crystalline structure of cellulose subjected to an alkaline environme...
Article
Full-text available
The exploitation of biomass represents a major environmental challenge related to the protection of the environment and the progressive exhaust of fossil resources. In this perspective, the main objective of this work is the extraction and the characterization of natural lignocellulosic fibers from the Schinus molle. The cellulose fibre extraction...
Article
Lignin-cellulose nanofibrils (LCNF) are of attracting an increasing interest due to the benefits of maintaining the lignin in the nanomaterial composition. The production of LCNF requires considerable energy consumption, which has been suppressed employing pretreatment of biomass, in which it highlights those that employ enzymes that have the advan...
Chapter
Polymer networks derived from furan monomers are discussed, with particular emphasis on recent contributions. Resins based on furfural and furfuryl alcohol represent the most important family within this context, but other materials are becoming relevant, such as polyurethane foams, various photocurable macromolecules bearing furan rings within the...
Article
Nowadays, drug encapsulation and drug release from cellulose nanofibrils systems are intense research topics, and commercial grades of cellulose nanomaterials are currently available. In this work we present an ester-containing prodrug of metronidazole that is covalently bound to cellulose nanofibrils in aqueous suspension through a two-step immobi...
Article
Full-text available
Nanofibrilated cellulose (NFC) films have potential to replace synthetic polymers as flexible films for packaging. However, NFC is hydrophilic and water acts as plasticizer decreasing the stiffness of the films and reducing its barrier effectiveness against water vapor and oxygen. Here we describe the surface modification of cellulose films with bl...
Article
The aim of this work was to study the cellulose fibers deconstruction by twin-screw extrusion with in situ enzymatic hydrolysis via bioextrusion, for cellulose nanofibrils (CNF) production. Cellulose pulp was extruded with an optimized screw profile, with or without (reference) the addition of an enzymatic solution. An increase of crystallinity ind...
Article
In this study, a new approach to optimize the cellulose nanocrystals (CNCs) extraction using acidic natural deep eutectic solvents (NADES) was introduced using, for the first time, design of experiment method. Choline chloride:oxalic acid dihydrate with a molar ratio of 1:1 was used to extract CNCs. Then, three most important parameters were varied...
Article
Full-text available
Bio-based polyurethanes (PUs) have been occurred a large attention nowadays. It was found to be an alternative to the petrochemical based materials to the fact of their weak environmental influence, availability, good price and biodegradability. In addition, the nature shows several bio-derived compounds as raw materials for the synthesis of polyol...
Article
Cellulose (CNF) and chitin (ChNF) nanofibers are known to form materials that are both tough and strong. In this study, we hypothesize that the inertness of networks produced from CNF and ChNF make them ideal templates for heterogenous reactions and in-situ formation of nanoarchitectures. We expand nanoparticles templating on polysaccharide colloid...
Chapter
Over the last decades, the development of renewable resources of fibres was intensified, which amplified the market request of such a raw material. This is due to three potential advantages associated with these natural substances, namely: very cheap, bio-renewable and their availability in large quantities with various varieties forms. This chapte...
Article
Polyurethanes are synthesized from polyols, which can be fossil- or plant-sourced. The goal of this study was to investigate how the use of plant-sourced polyols, i.e., the ricinoleic acid triglyceride (the main component of castor oil, CO) and lignosulfonate, impacts the properties of the materials, as well as of their composites reinforced with s...
Article
Cellulose nanofibrils were efficiently produced from eucalyptus fibers using a combined NaOH and enzymatic treatment followed by a pilot scale grinding process. The structural changes of fibers were assessed after NaOH treatments at 5, 10 and 15 wt% concentrations. A progressive shift from a cellulose I to a cellulose II crystalline structure was o...
Article
Developing polyols from abundant and renewable biomass resources is an important topic for polymer synthesis. In this work, the Response Surface Methodology (RSM) was applied to a novel oxypropylation case study, almond shell (AS), an agroindustry lignocellulosic by-product. Mathematical models were developed to determine responses maximizing the r...
Article
Full-text available
In the current context, the development of bio-based and high-performance materials is one of the main research priorities. This study aims to combine the outstanding properties of cellulose nanofibrils (CNFs) or nanocrystals (CNCs) with those of bio-based poly(lactic acid) (PLA). Three-phase multilayered materials (TMLs) were built up by complexin...
Article
Full-text available
The biocompatibility and very high specific area of cellulose nanofibrils (CNF) are properties of high interest for the development of active substrates for new medical device development. Enzyme pretreated CNF (CNF-e) can be self-organized into nanostructured membranes that are suitable for active principle ingredients (API) encapsulation through...
Article
Full-text available
In this study, the grafting of 1-methyl-3-phenylpropylamine (1-M-3-PP) on cellulose nanocrystals (CNCs) via a two-step reaction route was investigated and compared with physico-chemical surface adsorption. The first step involved subjecting CNCs to a 2,2,6,6-Tetramethyl-1-piperidinyloxy (TEMPO)-mediated oxidation. The carboxylic groups present on r...
Article
Full-text available
The recent emergence of bio-based nanocomposites makes perfect sense from a technical and environmental point of view. Cellulose nanocrystals (CNCs) are novel bio-based nanomaterials with a wide range of beneficial properties. Their biodegradability, crystallinity, high surface area, and mechanical strength, as well as their highly reactive surface...
Article
Full-text available
Cellulose nanocrystals (CNCs) are used to design nanocomposites because of their high aspect ratio and their outstanding mechanical and barrier properties. However, the low compatibility of hydrophilic CNCs with hydrophobic polymers remains a barrier to their use in the nanocomposite field. To improve this compatibility, poly(glycidyl methacrylate)...
Article
Full-text available
Cellulose nanofibrils (CNF) are renewable bio-based materials with high specific area, which makes them ideal candidates for multiple emerging applications including for instance on-demand drug release. However, in-depth chemical and structural characterization of the CNF surface chemistry is still an open challenge, especially for low weight perce...
Chapter
Full-text available
During the last two decades, interest in cellulosic nanomaterials has greatly increased. Among these nanocelluloses, cellulose nanocrystals (CNC) exhibit outstanding properties. Indeed, besides their high crystallinity, cellulose nanocrystals are interesting in terms of morphology with high aspect ratio (length 100–1000 nm, width 2–15 nm), high spe...
Poster
Full-text available
Lignin and cellulose are two bio-based and biodegradable polymers with matching properties. The goal of this study is to process it at the nanoscale to obtain new interactions. The reduced scale enhances the contact surface between materials and the surface availability for contact applications. The preparation of lignin particles on 3 different ty...
Article
The study deals with the synthesis of thermally reversible hydrogels from modified cellulose nanofibers via the Diels-Alder "click" reaction in an aqueous medium. "Never-dried" cellulose fibres derived from hardwood were submitted to shearing and surface TEMPO-oxidation before being modified with furfurylamine. The ensuing pendant furan moieties we...
Article
Chemical modifications of cellulose fibers as pretreatment for cellulose nanofibrils (CNF) production have been investigated to improve the production process and the quality of obtained cellulosic nanomaterial. In this study, phosphorylation of cellulose fibers was done in anticipation of a future nanofibrillation. Different phosphate salts, namel...
Article
Full-text available
Phosphorylated cellulose nanofibrils (CNFs) were produced using a twin-screw extruder (TSE). The energy efficiency was compared with that of an ultra-fine grinder (UFG). CNFs at different solid contents were produced (10 wt% for the TSE and 2 wt% for the UFG), and their quality was compared using several characterization tests, such as optical micr...
Article
Full-text available
This paper describes the use of agricultural wastes for the preparation of carboxymethylcellulose (CMC) with a high degree of substitution using two methods: the classic and a microwave-assisted method. A series of CMC samples with degrees of substitution from 0.43 to 2.83 were prepared from cellulose extracted from almond shells, almond stems, and...
Article
In this study, an innovative and green process to produce cellulose nanofibers (CNF) is proposed. CNF are usually produced uses via mechanical, enzymatic, and/or chemical treatment such as TEMPO-mediated oxidation of cellulose fibers, but for now this method involves high energy consumption, which limits the commercialization of the CNF. Moreover,...
Poster
Full-text available
This work is devoted to the valorization of two residues: Prunus amygdalus and Tamarisk sp. First, their chemical compositions were studied according to standard methods. The results revealed that the existing amounts of holocellulose, lignin and cellulose were close to those encountered in other annual plants and non-wood species. The chemical com...
Article
Enzymatic biofuel cells are emerging technologies which gain a lot of interest as a power source for implantable devices. Effective enzyme wiring and simplification of the cell architecture are the main limitations of the fuel cell development nowadays. In the present study, spray coating was used as a reliable process to produce flexible biocathod...
Article
Full-text available
In Tunisia, important quantities of almond and fig stems are accumulated each year. An approach to valorizing these renewable resources has been proposed in this study. This work is focused on the chemical composition of almond and fig stems. The polysaccharide content for both materials was determined to be of about 60%. That is the main reason th...
Article
The production of nanocellulose has garnered increased attention in the past decades and is now the second-ranked priority of the European bioeconomy. The number of papers published on nanocellulose has increased by six fold in the last five years and studies on nanofibrillated cellulose (CNF) represent nearly 65% of that literature. Studies in the...
Article
Full-text available
Process simulation is a useful tool that has been widely used to analyze, design and optimize energy balances in chemical technologies including those related to biomass processing, biorefinery processes and chemical engineering. The presented data set serves as basis for the simulation of chitin purification, nanofibers and nanocrystals production...
Article
Chitin nanocrystals (ChNCs) and chitin nanofibers (ChNFs) are nanomaterials with great innovative potential for sustainable applications in academic and industrial fields. The research related to their isolation and production, characterization, and utilization is still new. The aim of this study is to investigate the effects of the production proc...
Article
Full-text available
Oxidized cellulose nanocrystals with sodium carboxylate groups (TOCNC-COONa) and with free carboxyl groups (TOCN-COOH) were prepared and then chemically modified with beta-cyclodextrin (βCD) and hydroxypropyl-beta-cyclodextrin (HPβCD) to prepare materials able to load and release antibacterial molecules over a prolonged period of time. The material...
Chapter
The development of renewable resources has become a very attractive concept, and so the main purpose of this chapter is to discuss the potential for adding economic value to Posidonia oceanica. This marine biomass has recently received considerable attention as a potential eco-friendly and novel source of lignocellulosic material. A general overvie...
Article
Nanocomposites are an opportunity to increase the performance of polymer membranes by fine-tuning their morphology. In particular, the understanding of the contribution of the polymer matrix/nanofiller interface to the overall transport properties is key to design membranes with tailored selective and adsorptive properties. In that aim, cellulose n...
Article
Superhydrophobic surfaces have high potential in self-cleaning and anti-fouling applications. We developed a one-step superhydrophobic coating formulation containing sodium oleate (NaOl), hydrophobized precipitated calcium carbonate and biobased cellulose nanofibrils (CNFs) hydrophobized with either alkyl ketene dimer (AKD) or amino propyl trimetho...
Article
Two distinct lignocellulosic fractions (rind and core) can be obtained through a physical separation of sugarcane stalks. Although presenting differences in morphology, both fractions can be employed to produce pulps and papers. The pulps and paper sheets produced from the core and rind fractions were characterized by their chemical composition, ph...
Article
Nucleic acid amplification testing is a very powerful method to perform efficient and early diagnostics. However, the integration of a DNA amplification reaction with its associated detection in a low-cost, portable, and autonomous device remains challenging. Addressing this challenge, the use of screen-printed electrochemical sensor is reported. T...
Article
Nucleic acid amplification testing is a very powerful method to perform efficient and early diagnostics. However, the integration of a DNA amplification reaction with its associ-ated detection in a low-cost, portable and autonomous device remains challenging. Addressing this challenge, the use of screen-printed electrochemical sensor is reported. T...
Poster
Full-text available
The hydrolyzation/condensation process of APMS in 100% aqueous solution was studied by 29Si NMR. APMS affinity toward CNF was also monitored by QCM-D and compared with other organotrimethoxy silane. The resulting material surface and the barrier properties of CNF films were assessed. Interestingly, the prepared materials showed rather good hydropho...
Article
Production of nanofibrillated cellulose (CNF) has gained increasing attention during the last decades with its recent industrialisation, but such process consumes still too high amount of energy. Here, cellulose nanofibrils at high solid content (20-25 wt%) and consuming 60% less energy compared to conventional process were produced from enzymatic...
Poster
Efficient and reliable Point-of-Care diagnostics are of utmost importance in the fight against infectious diseases and epidemics in developing countries. In fact to avoid overtreatment and the use of broad-spectrum antibiotics, which may result in an increased antimicrobial resistance [1,2], sensitivs diagnostics are required. Besides, because thes...
Poster
Full-text available
In this study, superhydrophobic coatings and strucutred surfaces are expected to delay or reduce bacterial growth on a cardboard. Cellulose nanofiber (CNF) as a replacement of usual latex binder could provide in addition to its renewability, a site for antibacterial grafting in addition to superhydrophobicity of the SH coating. A collaboration proj...
Article
Due to their compactness and independence of exterior energy sources, capillary microsystems are increasingly used in many different scientific domains, from biotechnology to medicine and biology, chemistry, energy and space. Obtaining a capillary flow depends on channel geometry and contact angle. A general condition for the establishment of a spo...
Conference Paper
Accurate and sensitive diagnostics are of utmost importance in the fight against infectious diseases and epidemics. Indeed, without such diagnostics broad-spectrum atibiotics are used and it may result in an increased antimicrobial resistance [1,2]. Because laboratories and medical infrastructures are not always available, in particular in developp...
Article
Hydrophilic porous substrates, in particular paper, are now widely used for the fabrication of microfluidic devices. These materials are very attractive because of their low-cost and their ability to generate capillary flow. Such materials avoid the need of external pressure sources or syringe pumps. However, capillary flows wicking a hydrophilic f...
Article
Full-text available
The present investigation deals with the development and characterization of a new controlled release packaging system for food. Novel sustained system was developed by direct grafting of beta-cyclodextrin (βCD) on the carboxyl groups of TEMPO-oxidized cellulose nanofibers (TEMPO-CNF) in aqueous solution and without using any spacer. Carvacrol, an...
Article
Large mineral fillers have long been used in papermaking for many reasons. The finish of the writing and printing paper depends on using the fillers as internal or surface treatments. During this study, Tamarisk sp. and Prunus amygdalus pulp-filled papers with raw phosphogypsum (PG) and calcined PG (CPG) at different percentages were studied. First...
Article
Full-text available
In the present work two agricultural residues (apple tree pruning and pea stalks) were studied as sources of nanocellulose. Different pretreatments that might be used in a biorefinery were applied to these lignocellulosic materials: autohydrolysis, organosolv (acetosolv) and alkaline pretreatments. After conventional bleaching, the resulting cellul...
Article
Recent focus on the preparation of antimicrobial surfaces using cellulose nanofibers (CNF) has gained considerable attention. In this work, functionalization of CNF films in 100% aqueous solution with three different aminosilanes, including 3-aminopropyl trimethoxysilane (APMS), 2-aminoethyl 3-aminopropyl trimethoxysilane (DAM