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Debabrata Chakrabarty - One of the best experts on this subject based on the ideXlab platform.
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studies on the mechanical thermal morphological and barrier properties of nanocomposites based on poly vinyl alcohol and Nanocellulose from sugarcane bagasse
Journal of Industrial and Engineering Chemistry, 2014Co-Authors: Arup Ratan Mandal, Debabrata ChakrabartyAbstract:Abstract Nanocomposites from poly(vinyl alcohol) [PVA] in linear and crosslinked state were synthesized using varying proportions of bagasse extracted Nanocellulose. These were characterized by tensile, thermal, X-ray diffraction (XRD), moisture vapor transmission rate (MVTR), and morphological studies. Crosslinked PVA and linear PVA nanocomposite exhibited highest tensile strength at 5 wt.% and 7.5 wt.% of Nanocellulose respectively. Thermogravimetric analysis (TGA) studies showed higher thermal stability of nanocomposite made of crosslinked PVA and Nanocellulose with respect to linear PVA and Nanocellulose. TEM and AFM studies confirm the formation of nanocomposites while the SEM images show the dispersion of Nanocellulose particles in them.
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isolation of Nanocellulose from waste sugarcane bagasse scb and its characterization
Carbohydrate Polymers, 2011Co-Authors: Arup Ratan Mandal, Debabrata ChakrabartyAbstract:Nanocellulose obtained by acid hydrolysis of sugarcane bagasse (SCB) has been characterized by Fourier transformed infrared (FTIR) spectra, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), dynamic light scattering (DLS), scanning electron microscopy (SEM) and atomic force microscopy (AFM) and transmission electron microscopy (TEM) studies. Nanocellulose and cellulose exhibited identical FTIR spectra quite different from SCB. TG analysis shows that the bagasse starts to degrade earlier than cellulose and the Nanocellulose shows an even earlier onset of degradation compared to SCB but leaves the maximum residue within the range of temperatures studied. DSC studies revealed that SCB, cellulose and the Nanocellulose differ in their loosely bound moisture content. The Nanocellulose exhibits an intermediate behavior between SCB and cellulose. The XRD shows enrichment in the proportion of crystalline cellulose in Nanocellulose, which manifests significant conversion of cellulose I to cellulose II. DLS studies show particle size distribution in the nanorange which has been substantiated by SEM, AFM and TEM.
Clément Sanchez - One of the best experts on this subject based on the ideXlab platform.
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Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications
Chemical Reviews, 2018Co-Authors: Bejoy Thomas, Jithin Joy, Audrey Moores, Glenna L. Drisko, Midhun Raj, Athira B, Rubiyah H, Clément SanchezAbstract:With increasing environmental and ecological concerns due to the use of petroleum-based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability, and abundance. In this review, we present Nanocellulose-based materials from sourcing, synthesis, and surface modification of Nanocellulose, to materials formation and applications. Nanocellulose can be sourced from biomass, plants, or bacteria, relying on fairly simple, scalable, and efficient isolation techniques. Mechanical, chemical, and enzymatic treatments, or a combination of these, can be used to extract Nanocellulose from natural sources. The properties of Nanocellulose are dependent on the source, the isolation technique, and potential subsequent surface transformations. Nanocellulose surface modification techniques are typically used to introduce either charged or hydrophobic moieties, and include amidation, esterification, etherification, silylation, polymerization, urethanization, sulfonation, and phosphorylation. Nanocellulose has excellent strength, high Young’s modulus, biocompatibility, and tunable self-assembly, thixotropic, and photonic properties, which are essential for the applications of this material. Nanocellulose participates in the fabrication of a large range of nanomaterials and nanocomposites, including those based on polymers, metals, metal oxides, and carbon. In particular, Nanocellulose complements organic-based materials, where it imparts its mechanical properties to the composite. Nanocellulose is a promising material whenever material strength, flexibility, and/or specific nanostructuration are required. Applications include functional paper, optoelectronics, and antibacterial coatings, packaging, mechanically reinforced polymer composites, tissue scaffolds, drug delivery, biosensors, energy storage, catalysis, environmental remediation, and electrochemically controlled separation. Phosphorylated Nanocellulose is a particularly interesting material, spanning a surprising set of applications in various dimensions including bone scaffolds, adsorbents, and flame retardants and as a support for the heterogenization of homogeneous catalysts.
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Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications
Chemical reviews, 2018Co-Authors: Bejoy Thomas, Midhun C. Raj, Athira K. B, Rubiyah M. H, Jithin Joy, Audrey Moores, Glenna L. Drisko, Clément SanchezAbstract:With increasing environmental and ecological concerns due to the use of petroleum-based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability, and abundance. In this review, we present Nanocellulose-based materials from sourcing, synthesis, and surface modification of Nanocellulose, to materials formation and applications. Nanocellulose can be sourced from biomass, plants, or bacteria, relying on fairly simple, scalable, and efficient isolation techniques. Mechanical, chemical, and enzymatic treatments, or a combination of these, can be used to extract Nanocellulose from natural sources. The properties of Nanocellulose are dependent on the source, the isolation technique, and potential subsequent surface transformations. Nanocellulose surface modification techniques are typically used to introduce e...
Arup Ratan Mandal - One of the best experts on this subject based on the ideXlab platform.
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studies on the mechanical thermal morphological and barrier properties of nanocomposites based on poly vinyl alcohol and Nanocellulose from sugarcane bagasse
Journal of Industrial and Engineering Chemistry, 2014Co-Authors: Arup Ratan Mandal, Debabrata ChakrabartyAbstract:Abstract Nanocomposites from poly(vinyl alcohol) [PVA] in linear and crosslinked state were synthesized using varying proportions of bagasse extracted Nanocellulose. These were characterized by tensile, thermal, X-ray diffraction (XRD), moisture vapor transmission rate (MVTR), and morphological studies. Crosslinked PVA and linear PVA nanocomposite exhibited highest tensile strength at 5 wt.% and 7.5 wt.% of Nanocellulose respectively. Thermogravimetric analysis (TGA) studies showed higher thermal stability of nanocomposite made of crosslinked PVA and Nanocellulose with respect to linear PVA and Nanocellulose. TEM and AFM studies confirm the formation of nanocomposites while the SEM images show the dispersion of Nanocellulose particles in them.
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isolation of Nanocellulose from waste sugarcane bagasse scb and its characterization
Carbohydrate Polymers, 2011Co-Authors: Arup Ratan Mandal, Debabrata ChakrabartyAbstract:Nanocellulose obtained by acid hydrolysis of sugarcane bagasse (SCB) has been characterized by Fourier transformed infrared (FTIR) spectra, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD), dynamic light scattering (DLS), scanning electron microscopy (SEM) and atomic force microscopy (AFM) and transmission electron microscopy (TEM) studies. Nanocellulose and cellulose exhibited identical FTIR spectra quite different from SCB. TG analysis shows that the bagasse starts to degrade earlier than cellulose and the Nanocellulose shows an even earlier onset of degradation compared to SCB but leaves the maximum residue within the range of temperatures studied. DSC studies revealed that SCB, cellulose and the Nanocellulose differ in their loosely bound moisture content. The Nanocellulose exhibits an intermediate behavior between SCB and cellulose. The XRD shows enrichment in the proportion of crystalline cellulose in Nanocellulose, which manifests significant conversion of cellulose I to cellulose II. DLS studies show particle size distribution in the nanorange which has been substantiated by SEM, AFM and TEM.
Byungdae Park - One of the best experts on this subject based on the ideXlab platform.
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tensile and thermal properties of Nanocellulose reinforced poly vinyl alcohol nanocomposites
Journal of Industrial and Engineering Chemistry, 2011Co-Authors: Mijung Cho, Byungdae ParkAbstract:Abstract This work reports on the mechanical and thermal properties of poly(vinyl alcohol) (PVA) nanocomposites reinforced with Nanocelluloses isolated by the sulfuric acid hydrolysis using commercial microcrystalline cellulose (MCC). Nanocellulose-reinforced PVA nanocomposite films were prepared by the casting method with different Nanocellulose loadings, which were exposed to tensile test, thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The Nanocellulose obtained by the acid hydrolysis was a rod-like whisker form. Wet particle size analysis resulted in an average size of about 340 nm. But, the measurements of individual Nanocelluloses using transmission electron microscopy (TEM) provided the dimensions of about 6.96 nm wide and 178 nm long. The crystallinity of the Nanocellulose was quite high (85.2%), which was greater than that of the MCC. The tensile modulus and strength of the nanocomposites were improved with an increase in the Nanocellulose content, but decreased at the Nanocellulose content of 7 wt%. Thermal stability of the nanocomposites was improved as the Nanocellulose content increased up to 7 wt%. The DMA result shows a significant increase of the storage modulus of the nanocomposite at the 3 wt% Nanocellulose. These results indicate that the Nanocellulose has a great potential to reinforce PVA polymers.
Orlando J. Rojas - One of the best experts on this subject based on the ideXlab platform.
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Nanocellulose Applications in Papermaking
Production of Materials from Sustainable Biomass Resources, 2019Co-Authors: Carlos Salas, Martin A. Hubbe, Orlando J. RojasAbstract:Research on the utilization of biomass feedstocks has evolved rapidly in the past decades. Key developments include the production of materials with a more sustainable footprint than those derived from petrochemicals. Among associated materials, Nanocelluloses have been produced from different sources and routes, such as high shear fibrillation and hydrolysis (chemical or enzymatic) or their combinations. The unique properties of Nanocelluloses have sparked a myriad of uses including those related to the fields of oil and gas, adhesion, film formation, coating, packaging, food and composite processing. High end uses include the development of advanced lightweight materials, biosensors and energy harvesting systems; however, central to this review are uses closer to the source itself, namely fiber processing and, in particular, papermaking. In this chapter, the literature in these latter applications is discussed with emphasis on the use of Nanocellulose to achieve favorable strength and barrier properties as well as in coating and paper sheet-forming.
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Nanocellulose–surfactant interactions
Current Opinion in Colloid & Interface Science, 2017Co-Authors: Blaise L. Tardy, Tetsuo Kondo, Shingo Yokota, Mariko Ago, Wenchao Xiang, Romain Bordes, Orlando J. RojasAbstract:Biomass-derived nanomaterials, such as cellulose nanocrystals and nanofibrils, are attractive building blocks for the formulation of foams, emulsions, suspensions and multiphase systems. Depending on their surface chemistry, aspect ratio and crystallinity, Nanocelluloses can control the rheology and stability of dispersions; they can also confer robust mechanical properties to composites. Synthetic modification of fibrillar cellulose is an option to achieve chemical compatibility in related systems, in the formation of composites, etc. However, this can also limit the environmental benefits gained from the use of the cellulosic component. Thus, an attractive mean to compatibilize and to further expand the applications of Nanocelluloses is through the use of surfactants. The chemical toolbox of surfactants developed over the last 60 years allows for a large versatility while their environmental impact can also be minimized. Furthermore, relatively small amounts of surfactants are sufficient to significantly impact the interfacial forces, which has implications in material development, from the colloidal scale to the macro-scale. In this review we attempt to cover the literature pertaining to the combined uses of surfactants and Nanocelluloses. We summarize reports on the incorporation with Nanocellulose of nonionic, anionic, amphoteric and cationic surfactants. With the ever-expanding interest in the use of renewable materials in a vast range of applications, we hope to provide insights into the application of surfactants as a tool to tailor the compatibility and the surface chemistry of Nanocelluloses.
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Nanocellulose properties and applications in colloids and interfaces
Current Opinion in Colloid and Interface Science, 2014Co-Authors: Carlos Salas, Orlando J. Rojas, Tiina Nypelo, Carlos Rodriguezabreu, Carlos A CarrilloAbstract:Abstract In this review we introduce recent advances in the development of cellulose nanomaterials and the construction of high order structures by applying some principles of colloid and interface science. These efforts take advantage of natural assemblies in the form of fibers that nature constructs by a biogenetic bottom-up process that results in hierarchical systems encompassing a wide range of characteristic sizes. Following the reverse process, a top-down deconstruction, cellulose materials can be cleaved from fiber cell walls. The resulting Nanocelluloses, mainly cellulose nanofibrils (CNF) and cellulose nanocrystals (CNC, i.e., defect-free, rod-like crystalline residues after acid hydrolysis of fibers), have been the subject of recent interest. This originates from the appealing intrinsic properties of Nanocelluloses: nanoscale dimensions, high surface area, morphology, low density, chirality and thermo-mechanical performance. Directing their assembly into multiphase structures is a quest that can yield useful outcomes in many revolutionary applications. As such, we discuss the use of non-specific forces to create thin films of Nanocellulose at the air–solid interface for applications in nano-coatings, sensors, etc. Assemblies at the liquid–liquid and air–liquid interfaces will be highlighted as means to produce Pickering emulsions, foams and aerogels. Finally, the prospects of a wide range of hybrid materials and other systems that can be manufactured via self and directed assembly will be introduced in light of the unique properties of Nanocelluloses.
