Search results for "Polarized light"

showing 3 items of 23 documents

A multi-analytical approach for the characterization of black crusts on the facade of an historical cathedral

2020

Abstract This study focuses on the characterization of black crusts collected from the Monza cathedral located in the homonymous city (N Italy), a hot spot from the point of view of the atmospheric pollution. Black crusts and substrate marble specimens were analyzed by a multi-analytical approach including X-ray Diffraction (XRD), Fourier Transform-Infrared spectroscopy (FT-IR), Stereomicroscopy (SM), Polarized Light Microscopy (PLM), High Resolution Scanning Electron Microscopy coupled with Energy Dispersive X-ray spectroscopy (HRSEM-EDX) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP/MS). The characterization of the carbon fraction (organic carbon, OC, and element…

Thermogravimetric analysisPolarized light microscopyMaterials scienceScanning electron microscope010401 analytical chemistryMineralogychemistry.chemical_element02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesNitrogenBlack carbonaceous particles Black crusts Conservation Cultural Heritage Marble stone Urban air pollution0104 chemical sciencesAnalytical ChemistryCharacterization (materials science)chemistry.chemical_compoundchemistryCarbonate0210 nano-technologySpectroscopyCarbonSettore GEO/09 -Georis. Miner.e Appl.Mineral.-Petrogr. per l'Ambi.ed i B.Cult.SpectroscopyMicrochemical Journal
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Tetra-alkoxy substituted PPV derivatives: a new class of highly soluble liquid crystalline conjugated polymers

2011

Two first examples of highly soluble tetra-alkoxy substituted PPV derivatives, poly(2,3,5,6-tetrahexyloxy-1,4-phenylene vinylene) (TH-PPV) and poly[2,3,5,6-tetra(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] TEH-PPV, are presented. Both polymers have been fully characterized and the solubility and UV-Vis absorption characteristics have been studied in various organic solvents. Due to the symmetric nature of the repeating unit, TH-PPV and TEH-PPV have an inherently regioregular nature, which is unusual for PPV-type polymers. Observations from polarized light microscopy and differential scanning calorimetry indicate that TH-PPV exhibits thermally induced order resulting in a liquid crystalline m…

chemistry.chemical_classificationPolarized light microscopyMaterials sciencePolymers and PlasticsOrganic ChemistryMesophaseBioengineeringPolymerElectroluminescenceConjugated systemPhotochemistryBiochemistrychemistryPolymer chemistrySide chainAlkoxy groupAlkylPolymer Chemistry
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Composite soy lecithin–decylpolyglucoside vesicles: A theoretical and experimental study

2008

In the present work, vesicles made with soy lecithin and a commercial mixture of alkyl polyglucosides were prepared and characterized. Vesicles with a constant amount of soy lecithin and an increasing amount of a decylpolyglucoside surfactant, (OrNS10), were formulated and their physicochemical properties were studied with the aim to design a drug delivery system suitable for different applications. To this purpose, morphology, size distribution, ζ-potential and apparent viscosity of the prepared vesicles were studied. Vesicles were also characterized by using optical and light polarized microscopy, transmission electron microscopy and photon correlation spectroscopy. A stability study was …

chemistry.chemical_classificationPolarized light microscopyfood.ingredientChromatographyAPPARENT VISCOSITY QUITARVesicleDECYLPOLYGLUCOSIDELECITINAApparent viscosityΖ-POTENTIALLecithinVESICULASVESICLESchemistry.chemical_compoundColloid and Surface ChemistryfoodchemistryDynamic light scatteringPulmonary surfactantPhosphatidylcholineLECITHINAlkylColloids and Surfaces A: Physicochemical and Engineering Aspects
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