1,721,105 research outputs found
Introduzione alla spettroscopia Raman
No full textLo scopo di questo capitolo è quello di introdurre il lettore alla Spettroscopia Raman. Partendo dalle teorie che stanno alla base di questa tecnica d’analisi, pur non dilungandosi troppo in dettagli, a cui si rimanda a testi di approfondimento riportati nei riferimenti bibliografici, si cercherà di trattare l’argomento in modo semplice e conciso.
Lo scopo del capitolo infatti è quello di capire le basi su cui si basa una tecnica di analisi spettroscopica a volte sottovalutata. Verrà fatto un confronto con la spettroscopia infrarosso evidenziandone vantaggi e svantaggi. Il lettore potrà in questo modo apprezzare meglio la tecnica e trovare possibili applicazioni nel proprio campo di ricerca.
Infine un paragrafo sarà dedicato allo strumento che verrà descritto in tutte le sue principali componenti
Biochar Emerging applications
Full text linkThis reference text covers the latest developments in biochar materials research, a field which is becoming increasingly popular due to the potential of biochar to replace carbon materials derived from non-renewable sources. Emerging and innovative applications of biochar materials are discussed, and all aspects of the field are covered, from production to applications, including details on the techniques used. There is a particular focus on biochar as a material for composites and sensors. This is the first book to cover emerging applications of biochar as an innovative, versatile, carbon-based renewable material, beyond its traditional uses in agriculture. It is a valuable reference for all researchers in the fields of biochar and carbon materials, including industry practitioners
Carbon Nanostructures for Actuators: An Overview of Recent Developments
Full text linkIn recent decades, micro and nanoscale technologies have become cutting-edge frontiers in material science and device developments. This worldwide trend has induced further improvements in actuator production with enhanced performance. A main role has been played by nanostructured carbon-based materials, i.e., carbon nanotubes and graphene, due to their intrinsic properties and easy functionalization. Moreover, the nanoscale decoration of these materials has led to the design of doped and decorated carbon-based devices effectively used as actuators incorporating metals and metal-based structures. This review provides an overview and discussion of the overall process for producing AC actuators using nanostructured, doped, and decorated carbon materials. It highlights the differences and common aspects that make carbon materials one of the most promising resources in the field of actuators
Development of Coffee Biochar Filler for the Production of Electrical Conductive Reinforced Plastic
Full text linkIn this work we focused our attention on an innovative use of food residual biomasses. In particular, we produced biochar from coffee waste and used it as filler in epoxy resin composites with the aim to increase their electrical properties. Electrical conductivity was studied for the biochar and biochar-based composite in function of pressure applied. The results obtained were compared with carbon black and carbon black composites. We demonstrated that, even if the coffee biochar had less conductivity compared with carbon black in powder form, it created composites with better conductivity in comparison with carbon black composites. In addition, composite mechanical properties were tested and they generally improved with respect to neat epoxy resin
A Short Note on the Interference Layer Microscopy
Full text linkThe interference layer microscopy is a specific technique of microscopy that requires the deposition on the specimen of a thin layer of a transparent dielectric material to enhance the contrast of the observed images. In white light, the different components of the specimen appear as having different and distinctive colors. In this manner, the specimen can be rendered in beautiful colored micrographs. Here, we shortly discuss this technique. We also propose an analysis of a colored image obtained by this technique, analysis made by means of a processing based on RGB histograms
Alignments of Carbon Nanotubes in Polymer Matrix: A Raman Perspective
No full textCarbon nanotubes are highly anisotropic due to their high aspect ratio, therefore it is very important to align them in CNT/polymer composites. The extent of alignment can be easily studied by Raman spectroscopy. Carbon nanotubes are aligned perpendicular and parallel to the polymer film by application of an external magnetic field in polyvinyl butyral (PVB). FT-IR spectra of these films suggest that there is no chemical reaction between CNT and polyvinyl butyral, but the decrease in the G band intensity of carbon nanotubes in Raman spectra suggests that the tangential site of carbon nanotubes faces the surface of the polymer film, indicating the alignment of the carbon nanotubes in a CNT/polymer composite
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