Elisabete Frollini
University of São Paulo
Izod impact strength testComposite numberBagasseNuclear chemistryComposite materialAbsorption of waterThermosetting polymerOrganic chemistryAqueous solutionChemistryPolymer chemistryMaterials scienceSISALCelluloseLigninChemical engineeringCrystallinityFiberPolymerDynamic mechanical analysis
147Publications
38H-index
3,541Citations
Publications 146
Newest
#1Roberta Teixeira Polez (USP: University of São Paulo)
#2Bruno V.M. Rodrigues (USP: University of São Paulo)H-Index: 12
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Abstract null null The increased awareness about environmental issues has resulted in developing novel materials and sustainable solutions to reduce the dependence on fossil-based products. Herein, cellulose from sisal was derivatized into carboxylic esters (acetate, Ac; butyrate, Bu; and hexanoate, Hx); the produced materials were “shaped” into mats composed of nano- and ultrathin fibers. Our objective was to assess the effects of cellulose ester degree of substitution (DS), low- and high DS, c...
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#1Ashvinder K. Rana (Sri Sai University)H-Index: 9
#2Elisabete Frollini (USP: University of São Paulo)H-Index: 38
Last. Vijay Kumar Thakur (Scotland's Rural College)H-Index: 78
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Cellulose nanocrystals (CNCs) have attracted great interest from researchers from academic and industrial areas because of their interesting structural features and unique physicochemical properties, such as magnificent mechanical strength, high surface area, and many hydroxyl groups for chemical modification, low density, and biodegradability. CNCs are an outstanding contender for applications in assorted fields comprehensive of, e.g., biomedical, electronic gadgets, water purifications, nanoco...
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#2Heloisa Ciol (USP: University of São Paulo)H-Index: 2
Last. Elisabete FrolliniH-Index: 38
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The heterogeneous structure of lignocellulosic biomass makes it difficult to dissolve its main components (cellulose, hemicelluloses, and lignin) by solvent action with the aim of further applying the mixture of the biological macromolecules generated in the solvent medium. In the present study, the dissolution efficiency (DE) of lignocellulosic sisal fibers in the lithium chloride/dimethylacetamide solvent system (LiCl/DMAc) was evaluated for further application in the formation of hydrogels. C...
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#1Joice Jaqueline Kaschuk (Aalto University)H-Index: 5
#2Maryam Borghei (Aalto University)H-Index: 21
Last. Orlando J. Rojas (Aalto University)H-Index: 74
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We studied the surface and microstructure of cellulose acetate (CA) films to tailor their barrier and mechanical properties for application in electrochromic devices (ECDs). Cross-linking of CA was...
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#1Rachel Passos de Oliveira Santos (USP: University of São Paulo)H-Index: 6
#2Luiz Antônio Ramos (USP: University of São Paulo)H-Index: 13
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Abstract Cellulose nanocrystals (CNCs), castor oil (CO), and recycled poly(ethylene terephthalate) (rPET), were used to add value to renewable raw materials and to a recycled polymer produced worldwide, producing mats composed of fibers on the nano- and submicrometric (ultrathin) scales through a sustainable process. Bio-based electrospun mats composed of aligned (rotary collector) and nonaligned (static collector) nanofibers/ultrathin fibers were produced from the electrospinning of solutions p...
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#1Joice Jaqueline Kaschuk (USP: University of São Paulo)H-Index: 5
#2Darlisson de Alexandria Santos (USP: University of São Paulo)H-Index: 12
Last. André Luiz Meleiro Porto (USP: University of São Paulo)H-Index: 25
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This study aimed to evaluate the production of cellulases from Aspergillus sp. CBMAI 1198, through solid-state fermentation, and their actions on different cellulosic materials (microcrystalline cellulose, sisal pulp, and filter paper). The influence of pH, temperature, and composition of substrates (sisal pulp and wheat straw), on the filter paper activity (FPase) of the cellulases produced from these substrates, was investigated using a complete central factorial composite design. Low temperat...
2 CitationsSource
#1Joice Jaqueline Kaschuk (USP: University of São Paulo)H-Index: 5
#2Talita M. Lacerda (USP: University of São Paulo)H-Index: 14
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Abstract The goal of this study was to investigate how the use of high concentration of cellulase may impact the properties of the substrate and the reaction medium during the enzymatic hydrolysis of the sisal pulp. Enzyme concentration of 0.9 mL g−1 was considered for hydrolysis of a sisal cellulosic substrate, and the results were compared with previous ones using 0.5 mL g−1 as cellulase concentration. Nonhydrolyzed pulps and the liquors were withdrawn from the reaction medium and characterize...
3 CitationsSource
#1Joice Jaqueline Kaschuk (USP: University of São Paulo)H-Index: 5
#2Kati MiettunenH-Index: 20
Last. Orlando J. RojasH-Index: 74
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Electrospun nanofibers obtained from cellulose acetate before (CA) and after (DCA) deacetylation were used as electrolyte membranes in dye-sensitized solar cells. As holders of the active components of the device and compared to the reference system, the CA and DCA membranes increased the average device efficiency by as much as 14%. The membranes enhanced the charge transfer at the counter electrode (assessed by the Ohmic and charge transfer resistance and corresponding Helmholtz capacitance). S...
3 CitationsSource
#1Daiana M. Furlan (USP: University of São Paulo)H-Index: 1
#2Daniella Lury Morgado (USP: University of São Paulo)H-Index: 9
Last. Elisabete Frollini (USP: University of São Paulo)H-Index: 38
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Abstract In this study, sisal cellulose/magnetite-nanoparticle (Fe3O4 NPs; 0.5, 1.4, and 3.0 g L−1) hybrid films (denoted as FCFe0.5, FCFe1.4, and FCFe3.0, respectively) were prepared by casting, using the solvent system LiCl/DMAc. Sisal was chosen as a cellulose source because it is a fast-growing plant, in contrast to the long cycle of woody trees, and Brazil accounts for most of the sisal produced in the world. Fe3O4 NPs were chosen owing to their excellent properties (superparamagnetic behav...
9 CitationsSource
#1Joice Jaqueline Kaschuk (USP: University of São Paulo)H-Index: 5
#2Elisabete Frollini (USP: University of São Paulo)H-Index: 38
Abstract Properties of cellulosic materials, such as average molar mass (MMvis), crystallinity index and hemicelluloses content may influence the efficiency of the enzymatic conversion of cellulose to glucose. Studies on the simultaneous influence of these parameters have been scarcely found in the literature. In the present study, the conversion of cellulose to glucose was investigated using cellulosic materials with different MMvis, crystallinity, and hemicelluloses content: microcrystalline c...
17 CitationsSource