Topic
Differential scanning calorimetry
About: Differential scanning calorimetry is a research topic. Over the lifetime, 50315 publications have been published within this topic receiving 1152335 citations. The topic is also known as: DSC.
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TL;DR: In this article, a drop calorimetric study of amorphous SiO 2, NaAlSi 3 O 8, KAlSi3 O 8, NaO 2 O 6, NaO 4 O 4, NaSiO 4 and KSiO 8 O 8 showed that the fictive temperature has negligible effect on the heat capacity above room temperature.
157 citations
TL;DR: A concept for highly ordered solid-state structures with bright fluorescence is proposed: liquid crystals based on tetraethynylpyrene chromophores, where the rigid core is functionalized with flexible, promesogenic alkoxy chains.
Abstract: A concept for highly ordered solid-state structures with bright fluorescence is proposed: liquid crystals based on tetraethynylpyrene chromophores, where the rigid core is functionalized with flexible, promesogenic alkoxy chains. The synthesis of this novel material is presented. The thermotropic properties are studied by means of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), and X-ray diffraction. The mesogen possesses an enantiotropic Colh phase over a large temperature range before clearing. The material is highly fluorescent in solution and, most remarkably, in the condensed state, with a broad, strongly red shifted emission. Fluorescence quantum yields (…F) have been determined to be 70% in dichloromethane solution and 62% in the solid state. Concentration- and temperature-dependent absorption and emission studies as well as quantum-chemical calculations on isolated molecules and dimers are used to clarify the type of intermolecular interactions present as well as their influence on the fluorescence quantum yield and spectral properties of the material. The high luminescence efficiency in the solid state is ascribed to rotated chromophores, leading to an optically allowed lowest optical transition.
157 citations
TL;DR: In this article, the long term degradation behavior of polycaprolactone (PCL) films, potentially useful as substrates for tissue engineering, obtained by two different methods (compression molding or casting in chloroform) in two biologically related media: phosphate buffered solution (PBS) and Dulbecco's modified Eagle's medium (DMEM).
157 citations
TL;DR: In this article, a wide-angle X-ray diffraction (WAXD), solid-state 13C NMR, differential scanning calorimetry (DSC), and atomic force microscopy (AFM) analysis was performed on poly(butylene adipate-co-butylene terephthalate) copolyesters.
156 citations
TL;DR: In this article, two poly(p-phenylenevinylene) (PPV) based polymers functionalized with an electron-deficient oxadiazole segment as the side chain by mimicking the chemical structure of 2-(4-biphenylyl)-5-( 4-tert-butylphenyl)-1,3,4-oxadiazoles (PBD) have been successfully synthesized through the Gilch route and Wittig method.
Abstract: Two poly(p-phenylenevinylene) (PPV) based polymers functionalized with an electron-deficient oxadiazole segment as the side chain by mimicking the chemical structure of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) have been successfully synthesized through the Gilch route and Wittig method. The obtained polymer II, which is a copolymer, is completely soluble in conventional organic solvents. However, polymer I, which is a homopolymer, is not soluble in any common organic solvents tried. The structure and purity of II have been characterized by FT-IR, 1H NMR, 13C NMR, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), UV−vis and photoluminescence (PL) spectroscopy, and electrochemical analysis. The TGA results indicate that II has very high thermal stability, while DSC investigation demonstrates that the glass transition temperature (Tg) of II is higher than 200 °C, which might be a merit for the long-life operation of light-emi...
156 citations