18 research outputs found
A delineating procedure to retrieve relevant publication data in research areas: the case of nanocellulose
Advances concerning publication-level classification system have been
demonstrated striking results by dealing properly with emergent, complex and interdisciplinary
research areas, such as nanotechnology and nanocellulose. However, less attention
has been paid to propose a delineating method to retrieve relevant research areas on
specific subjects. This study aims at proposing a procedure to delineate research areas
addressed in case nanocellulose. We investigate how a bibliometric analysis could provide
interesting insights into research about this sustainable nanomaterial. The research topics
clustered by a Publication-level Classification System were used. The procedure involves
an iterative process, which includes developing and cleaning a set of core publication
regarding the subject and an analysis of clusters they are associated with. Nanocellulose
was selected as the subject of study, but the methodology may be applied to any other
research area or topic. A discussion about each step of the procedure is provided. The
proposed delineation procedure enables us to retrieve relevant publications from research
areas involving nanocellulose. Seventeen research topics were mapped and associated with
current research challenges on nanocellulose.Merit, Expertise and Measuremen
Effects of cellulose nanofibrils on the structure and properties of maleic anhydride crosslinked poly(vinyl alcohol) electrospun nanofibers
Nanofibers of poly(vinyl alcohol) (PVA) reinforced with cellulose nanofibrils (CNFs) and/or crosslinked with maleic anhydride (MA) were produced by electrospinning technique to compare the additivation effects of the polymeric matrix. The results suggested that the PVA mass fraction equal to 14%, CNFs volumetric fraction of 3% and maleic acid at the molar ratio 20:1 are the best proportions for renewable base fibres production. In this study, the best electrospinning parameters for membranes production were obtained at the applied voltage of 24 kV, needle tip-to-collector distance of 14.5 cm, feed rate of 0.3 mL h1 and using a plate collector. CNFs and MA additions allow to improve nanofiber thermal properties and resistance to water degradation, which result in an eco-friendlier, biocompatible and long-term biodegradable nanofiber mats with diameters of 74±33 nm for water filtration purposes.The authors acknowledge the Portuguese Foundation for Science and Technology (FCT) for funding the project UID/CTM/00264/2013 and A. Zille contract IF/00071/2015.info:eu-repo/semantics/publishedVersio