Dipeptide biomaterials are strong piezoelectric materials that can convert applied mechanical forces into electricity. We have developed large-scale hybrid electrospun arrays containing N-tert-butoxycarbonyl (Boc) diphenylalanine in the form of nanotubes embedded biocompatible polymers. These nanofibers exhibit properties when a periodic force is applied. The nanostructured were produced by electrospinning technique. Optical absorption measurements show four bands spectral region 240-280 nm...

Dual self-assembly of dipeptides into microspheres and microtapes. Quantum confinement in self-assembled structures dipeptides. Self-assembly as nanospheres nanotubes blue luminescent electrospun fibers.

Using the electrospinning technique nanofibers consisting of organic nonlinear optical 3-nitroaniline (3NA, C

Polylactic acid (PLA) is a bio-based, biodegradable polymer that presents high potential for biomedical and sensing applications. Ongoing works reported in the literature concern mainly applications based on 3D printing, while textile are hindered by limited flexibility of PLA its composite filaments. In present work, PLA/multiwall carbon nanotube (MWCNT) filaments were produced with enhanced electrical conductivity, which may be applied structure. A plasticizer was incorporated...

Intense well polarized second harmonic light was generated by poly(methyl methacrylate) nanofibres with embedded para-nitroaniline nanocrystals. Subwavelength diameter fibres were electro-spun using a 1:2 weight ratio of chromophore to polymer. Analysis the indicates that molecules, which nominally crystalize in centrosymmetric space group, organized into noncentrosymmetric structures leading order susceptibility dominated single tensor element. Under best deposition conditions, nanofibrers...

The work reported demonstrates an simple method of extracting cellulose nanofibers (CNF) from microfibers (CMF) obtained the plant Stipatenacissima. Here, a for production CNF CMF extracted Alfa grass by exfoliation in polyvinyl alcohol (PVA) solution, is demonstrated. were produced powder form and exfoliated PVA aqueous solution to produce composites with 2, 4, 5 10 wt-% CNF. Scanning Electron Microscopy demonstrated CMF, dispersion wetting polymer. characterised thermogravimetry,...

Processing polymers by microinjection molding (μIM) generate specific constraints upon the polymer melt such as high shear stress and rapid cooling, leaving a mark microstructure of micropart. The present work compares morphology structure polyamide 6 samples produced extrusion μIM. specimens obtained were analyzed polarized light microscopy, differential scanning calorimetry, wide-angle X-ray diffraction. α γ crystalline forms formed in prepared both methods. form was dominant skin molded...

The properties of a polymer are strongly influenced by its morphology. In the case fibers from semi-crystalline polymers this consists degree crystallinity, spacing and alignment crystalline regions, molecular orientation chains in amorphous regions. Information on crystallinity can be obtained X-ray analysis. In-situ characterization during melt spinning process is major source information about effects material characteristics processing conditions upon structure evolution along spinline,...

The increasing complexity of printed circuit boards (PCBs) due to miniaturization, increased the density electronic components, and demanding thermal management during assembly triggered research innovative solder pastes electrically conductive adhesives (ECAs). Current commercial ECAs are typically based on epoxy matrices with a high load (>60%) silver particles, generally in form microflakes. present work reports production epoxy/carbon nanomaterials using carbon nanotubes (single...

Abstract Single wall carbon nanotubes (SWNT) are functionalized with poly(vinyl alcohol) (PVA). The homogeneously dispersed in a PVA solution. Nanocomposite films low SWNT content (0.1 to 1%) produced by the wet-casting method. X-ray diffraction shows that crystallinity was not affected presence of SWNT. improvement tensile modulus and strength at such reinforcement loadings is indicative good interfacial bonding between polymer matrix. Keywords: CARBON NANOTUBESCARBON...

The search for graphene or few-layer production methods that are simple, allow mass production, and yield good quality material continues to provoke intense investigation. present work contributes this investigation through the study of aqueous exfoliation four types sources, which namely graphite nanoflakes with different morphologies geographical origins. was achieved in an solution a soluble pyrene derivative synthesized achieve maximum interaction surface at low concentration (5 × 10-5...

Driven by the need to deliver new, lead-free, eco-friendly solder pastes for soldering electronic components Printed Circuit Boards (PCB), electrically conductive adhesives (ECAs) based on epoxy, carbon nanotubes (CNT), and exfoliated graphite (EG) were designed. The rheology of prepared is paramount success deposition process, which stencil printing. Thus, a rheological analysis process was first performed. Then, an experimental protocol defined assess relevant viscoelastic characteristics...

Abstract In recent years, significant attention has been given to “green” product innovation and related manufacturing processes. This work reports the preparation of few‐layer graphene (FLG) respective PLA‐based composites by an eco‐friendly, efficient, cost‐effective approach. FLG was produced in a scaled‐up process, based on noncovalent functionalization micronized graphite with pyrene derivate (PY), aqueous solution. The exfoliation degree, morphology, thermal stability exfoliated...

AbstractAbstractIn fibre production, draw induced crystallisation and orientation are the dominant factors that influence properties of final end use article. These depend on processing conditions; in particular, rate temperature change, which affects crystallinity, stress applied during drawing process, may also facilitate crystallisation. Polymer crystalline regions can be characterised by wide angle X-ray scattering (WAXS) small (SAXS). An system capable situ determination structure as it...

Abstract Graphene nanoribbons (GNR) were generated in ethanol solution by unzipping pyrrolidine‐functionalized carbon nanotubes under mild conditions. Evaporation of the solvent resulted regular few‐layer stacks graphene observed transmission electron microscopy (TEM) and X‐ray diffraction. The experimental interlayer distance (0.49–0.56 nm) was confirmed computer modelling (0.51 nm). Computer showed that large spacing (compared with graphite) is due to presence functional groups depends on...

Electronic packaging, or assembly of packed electronic components on printed circuit boards, present challenges that require innovative solder pastes and electrically conductive adhesives to face the increasing complexity PCB assembly, with denser board occupation demanding thermal management during assembly. Our aim is prepare carbon particle based adhesives. The first step achieve this goal was composites epoxy resin a variety nano micron scale particle, produced by mixing three roll mill....

Microinjection molding of polymer composites with carbon nanotubes (CNT) requires previous production the nanocomposites, often by melt extrusion. Each processing step has a thermo-mechanical effect on melt, conveying different properties to final product. In this work, polyamide 6 and its pristine functionalized CNT (f-CNT) were processed mini twin-screw extrusion, followed microinjection molding. The morphology induced each process was analyzed differential scanning calorimetry wide angle...

The search for graphene or few layer production methods that are simple, allow mass and yield good quality material continues to provoke intense investigation. present work contributes through the study of aqueous exfoliation four types sources, namely graphite nanoflakes with different morphologies geographical origin. was achieved in an solution a soluble pyrene derivative synthesized achieve maximum interaction surface at low concentration (5 x 10-5 M). bilayer obtained quantified by...

Polymer crystalline regions can be characterized by wide-angle X-ray scattering (WAXS) and small-angle (SAXS). The in-situ study of isotactic polypropylene with measurement wide angle small (WAXS SAXS), at varying distances from the exit extruder have been successfully completed using an system a standard source. processing conditions, used were: 50, 100, 200 400m.min-1 for take up speed, 0.3, 0.6, 1.2 cm3min-1hole-1 melt flow rates, spinning temperature 220°C. These experimental conditions...

In the title compound, C(20)H(18)N(2)O(2)S, indole mean plane and benzene ring form a dihedral angle of 65.0 (1)°. crystal structure, weak inter-molecular N-H⋯π C-H⋯O inter-actions link mol-ecules into ribbons propagated along [100].