Search results for "fabric"

showing 10 items of 545 documents

Interfacial Self-Assembly to Spatially Organize Graphene Oxide Into Hierarchical and Bioactive Structures

2020

Multicomponent self-assembly holds great promise for the generation of complex and functional biomaterials with hierarchical microstructure. Here, we describe the use of supramolecular co-assembly between an elastin-like recombinamer (ELR5) and a peptide amphiphile (PA) to organize graphene oxide (GO) flakes into bioactive structures across multiple scales. The process takes advantage of a reaction—diffusion mechanism to enable the incorporation and spatial organization of GO within multiple ELR5/PA layers. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ImageJ software were used to demonstrate the hierarchical organization of GO flakes within the ELR5/PA lay…

TechnologyMaterials scienceBiocompatibilityScanning electron microscopeMaterials Science (miscellaneous)Materials Sciencecomposite materialsFABRICATIONMaterials Science Multidisciplinaryhierarchical biomaterialsNanotechnology02 engineering and technology010402 general chemistrylcsh:Technology01 natural scienceselastin-like recombinamerlaw.inventionDESIGNlawPeptide amphiphileBIOMATERIALS0912 Materials EngineeringCHITOSANScience & Technology1007 Nanotechnologylcsh:TGrapheneSCAFFOLD021001 nanoscience & nanotechnologyMicrostructurepeptide amphiphiles0104 chemical sciencesmulticomponent self-assemblyDIFFERENTIATIONMembraneTransmission electron microscopygraphene oxideSelf-assembly0210 nano-technologyFILMFrontiers in Materials
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Plasmonic nanostructures through DNA-assisted lithography

2018

DALI combines DNA origami with conventional top-down fabrication for creating designer high-resolution plasmonic nanostructures.

TechnologyMaterials scienceFabricationmaterials scienceta221ta220Nanotechnology02 engineering and technologySpectrum Analysis Raman010402 general chemistry01 natural sciencesplasmonicssymbols.namesakenanorakenteetnanostructuresDNA origamiDNA nanotechnologyComputer SimulationnanolithographyLithographyNanoscopic scaleResearch ArticlesPlasmonMultidisciplinaryta114PhysicsSciAdv r-articlesMetamaterialself-assemblyDNA021001 nanoscience & nanotechnologyoptics0104 chemical sciencesChemistryTemplateApplied Sciences and EngineeringsymbolsNucleic Acid ConformationPrintingDNA origami0210 nano-technologyRaman spectroscopyBiotechnologyResearch Article
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Fabrication of CZTSe/CIGS Nanowire Arrays by One-Step Electrodeposition for Solar-Cell Application

2021

The paper reports some preliminary results concerning the manufacturing process of CuZnSnSe (CZTSe) and CuInGaSe (CIGS) nanowire arrays obtained by one-step electrodeposition for p-n junction fabrication. CZTSe nanowires were obtained through electrodeposition in a polycarbonate membrane by applying a rectangular pulsed current, while their morphology was optimized by appropriately setting the potential and the electrolyte composition. The electrochemical parameters, including pH and composition of the solution, were optimized to obtain a mechanically stable array of nanowires. The samples were characterized by scanning electron microscopy, Raman spectroscopy, and energy-dispersion spectros…

Technologynanowires solar cellsFabricationMaterials scienceScanning electron microscope020209 energytemplate electrodepositionNanowireCZTSe solar cell02 engineering and technologyArticlelaw.inventionsymbols.namesakelawSettore ING-IND/17 - Impianti Industriali MeccaniciSolar cellnanostructures0202 electrical engineering electronic engineering information engineeringGeneral Materials ScienceThin filmMicroscopyQC120-168.85business.industryTCZTSe solar cell nanostructures nanowires solar cells template electrodepositionQH201-278.5Engineering (General). Civil engineering (General)021001 nanoscience & nanotechnologyCopper indium gallium selenide solar cellsTK1-9971Settore ING-IND/23 - Chimica Fisica ApplicataDescriptive and experimental mechanicssymbolsOptoelectronicsElectrical engineering. Electronics. Nuclear engineeringTA1-20400210 nano-technologybusinessRaman spectroscopyChemical bath depositionMaterials
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A model of oil burnout from glass fabric

1997

A mathematical model is proposed for the process of the removal (by burning) of oil contained in a glass fibre insulation fabric manufactured in Latvia. The small aspect ratio of the fabric allows simplifications to the modelling which reduce the problem to a single nonlinear ordinary differential equation. When the effects of reflected radiation are also included, the differential equation is supplemented by two integral equations. Predictions of the position of the ‘burning zone’ accord well with observations made at the factory. The effect of the inclusion of extra heating chambers is also examined, and it is found that the temperature gradient in the fabric may be greatly decreased in t…

Temperature gradientMaterials sciencePosition (vector)Differential equationGlass fabricGlass fiberComposite materialNonlinear differential equationsIntegral equationAspect ratio (image)
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Continuous Microfiber Wire Mandrel‐Less Biofabrication for Soft Tissue Engineering Applications

2022

Suture materials are the most common bioimplants in surgical and clinical practice, playing a crucial role in wound healing and tendon and ligament repair. Despite the assortment available on the market, sutures are still affected by significant disadvantages, including failure in mimicking the mechanical properties of the tissue, excessive fibrosis, and inflammation. This study introduces a mandrel-less electrodeposition apparatus to fabricate continuous microfiber wires of indefinite length. The mandrel-less biofabrication produces wires, potentially used as medical fibers, with different microfiber bundles, that imitate the hierarchical organization of native tissues, and tailored mechan…

TendonsBiomaterialsWound HealingSuturesTissue EngineeringTensile Strengthbiofabrication biomaterials host response medical textiles inflammation macrophagic response.Biomedical EngineeringAnimalsPharmaceutical ScienceRatsAdvanced Healthcare Materials
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La scoperta, sistemazione e conservazione della grande Iscrizione di Gortina, nell'isola di Creta (1884-1921): la protezione delle testimonianze e le…

2013

La scoperta e la conservazione della Grande Iscrizione di Gortina a Creta, da parte degli studiosi italiani, fra la fine del XIX sec. e i primi decenni del XX sec., rappresentò un grande riconoscimento scientifico-culturale per la giovane nazione italiana. Nel passato, l’isola di Creta era stata legata alla Repubblica di Venezia e anche questo rapporto favorì l’invio a Creta del giovane epigrafista F. Halbherr, il quale fra notevoli peripezie rinvenne, assieme all’epigrafista tedesco E. Fabricius, la famosa l’iscrizione nell’antica città di Gortina. L’iscrizione, fra le più antiche e complete finora conosciute in tutta Europa, conteneva le norme sulla famiglia, l’eredità e in generale i dir…

The discovery and preservation of the Great Inscription of Gortyna in Crete by Italian researchers in the late nineteenth century. and the first decades of the twentieth century. was an important cultural and scientific recognition for the young Italian nation. In the past the island of Crete had been tied to the Republic of Venice and this report also favored sending in Crete the young epigraphist F. Halbherr who among considerable vicissitudes came to together to the epigraphist german E. Fabricius the inclusion of the famous ancient city of Gortyna. The inscription among the oldest and most comprehensive so far known throughout Europe the rules contained on the family's legacy in general and the rights and duties of some of the people of the Minoan civilization (480-450 BC). The inscription was carved on blocks organic limestone a restored ancient building which later in Roman times was turned into odeon. The Laws of Gortyn were engraved on the remains of the wall forming the passageway in front of the steps of the odeon. The essay traces the events that led to the discovery and subsequent storage made by Halbherr especially with the help of archaeologist L. Pernier and finally with the help of architect E. Stefani who designed a modern cover on the top of the ambulatory of the segments containing the inscription. This coverage was made to perform during the First World War on the basis of the Italian project from the Greek Government in order to protect the membership from possible war damage but especially from vandalism. The roof brick clay of the Laws of Gortyna still serves its function and ensures the use of the monument bearing witness to the preservation of Italian culture in Greece and more generally in the world. But in Sicily in the remains of the Villa del Casale in Piazza Armerina (Enna) its elegant protection (built in 1957) is representative of a whole period of culture of the Italian restoration is removed and replaced because it has not been able to make a ongoing maintenance is due. A bad example of conservation and management of a UNESCO monument from which arise after the work for the construction of new roofs an equally insulting to the archaeological heritage and scenic Italian and world.Settore ICAR/19 - Restauro
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Fabrication and Characterization of Polymeric Optical Waveguides Using Standard Silicon Processing Technology

2005

We report the fabrication and characterization of a rib polymeric waveguide having a thick layer of oxidized porous silicon as an innovative solution for the lower cladding. The waveguide was fabricated using standard silicon substrates and Si-based technology. The multimodal guiding structure has a polymethylmetacrylate (PMMA) core and the innovative lower cladding was obtained by thermal oxidation of a porous silicon layer. The waveguide does not have the upper cladding. Propagation loss measurements were performed at 1.48 /spl mu/m using the cut-back method. We obtained propagation loss of about 1.7 dB/cm, confirming the possibility to use the porous silicon oxide as the lower cladding l…

Thermal oxidationMaterials scienceFabricationSiliconbusiness.industryHybrid silicon laserchemistry.chemical_elementPorous siliconCladding (fiber optics)Waveguide (optics)Optical waveguidesOpticschemistryOptoelectronicsbusinessRefractive indexWaveguidesEthers
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A fully planar approach to the construction of X-Ray microcalorimeters with doped Germanium sensors

2008

We have investigated a fully planar technology for the development of arrays of X-ray microcalorimeters with doped germanium thermal sensor. We describe the proposed approach and show promising results obtained with the deep etching of germanium, the most critical step of the whole process.

Thermal sensorsMaterials sciencebusiness.industryThermistorDetectorDopingX-raychemistry.chemical_elementGermaniumCondensed Matter PhysicsAtomic and Molecular Physics and OpticsPlanarX-ray detectors microcalorimeter planar technologychemistryEtching (microfabrication)OptoelectronicsGeneral Materials Sciencebusiness
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Synthesis and characterisation of a ternary composite of polyaniline, reduced graphene-oxide and chitosan with reduced optical band gap and stable aq…

2019

A ternary composite comprising of p-toluene sulfonic acid doped polyaniline (PANI), chitosan and reduced graphene oxide (RGO) with stable aqueous dispersibility has been synthesised via oxidative polymerisation of aniline in chitosan/RGO dispersion. For comparison; PANI, PANI/chitosan and PANI/RGO composites were also synthesised using the same procedure. FTIR, Raman, XPS, XRD and UV-VIS confirmed the successful synthesis of the PANI and the composites. The aqueous dispersions of the PANI/chitosan and the ternary composites were found to be stable even after more than four months. The stability of the dispersion was attributed to the polycationic nature of the chitosan. The thermogravimetri…

Thermogravimetric analysisMaterials scienceReduced graphene-oxideComposite numberGeneral Physics and Astronomy02 engineering and technologySulfonic acid01 natural sciencesInverse Emulsion Polymerizationlaw.inventionAbsorptionChitosanCorrosion Protectionchemistry.chemical_compoundFabricationOptical band gaplaw0103 physical sciencesPolyanilineThermal stabilityChemical-Modification010302 applied physicschemistry.chemical_classification[PHYS]Physics [physics]ChitosanNanocompositeGrapheneSensorsTernary composite021001 nanoscience & nanotechnologylcsh:QC1-999Enhanced Electrical-ConductivityDoped polyanilinechemistryChemical engineeringFacile SynthesisAdsorption0210 nano-technologyTernary operationlcsh:Physics
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