1,720,998 research outputs found
Mechanical dispersion of layered double hydroxides hosting active molecules in polyethylene: Analysis of structure and physical properties
No full textEdible bio-nano-hybrid coatings for food protection based on pectins and LDH-salicylate: Preparation and analysis of physical properties
No full textSynthesis and characterization of new photoluminescent oxadiazole/carbazole-containing polymers
No full textWe report on the synthesis and the characterization of a new class of segmented polyethers POC containing the oxadiazole and
carbazole units. The polymers exhibit a high thermal stability, high glass transition temperatures, and good solubility in common
organic solvents, despite the extended aromatic portion in the main polymer chain. The synthetic procedures are simple, and
no acid side-products are obtained. According to previous reports on oxadiazole/carbazole-containing materials, POCs show
high photoluminescence activity in the blue region of the visible spectra. The good solubility in chlorinate solvents allows the
preparation of films with homogeneous thickness by spin coating. Glass transition temperature in the range 115–125◦C ensures
good stability of film morphology at room temperature. The only exception is POC(6), which shows a poor solubility and higher
Tg (170◦C), due to its shorter aliphatic chain portion. For these features, polymers POC are potential candidate materials for
fabricating blue light-emitting devices
Influence of the powder dimensions on the antimicrobial properties of modified layered double hydroxide
No full textPET and active coating based on a LDH nanofiller hosting p-hydroxybenzoate and food-grade zeolites: Evaluation of antimicrobial activity of packaging and shelf life of red meat
No full textEncapsulation of Lysozyme into halloysite nanotubes and dispersion in PLA: Structural and physical properties and controlled release analysis
No full textActive packaging based on cellulose trays coated with layered double hydroxide as nano‐carrier of parahydroxybenzoate: Application to fresh‐cut iceberg lettuce
No full textAntimicrobial Membranes of Bio-Based PA 11 and HNTs Filled with Lysozyme Obtained by an Electrospinning Process
No full textBio-based membranes were obtained using Polyamide 11 (PA11) from renewable sources and a nano-hybrid composed of halloysite nanotubes (HNTs) filled with lysozyme (50 wt % of lysozyme), as a natural antimicrobial molecule. Composites were prepared using an electrospinning process, varying the nano-hybrid loading (i.e., 1.0, 2.5, 5.0 wt %). The morphology of the membranes was investigated through SEM analysis and there was found to be a narrow average fiber diameter (0.3–0.5 μm). The mechanical properties were analyzed and correlated to the nano-hybrid content. Controlled release of lysozyme was followed using UV spectrophotometry and the release kinetics were found to be dependent on HNTs–lysozyme loading. The experimental results were analyzed by a modified Gallagher–Corrigan model. The application of the produced membranes, as bio-based pads, for extending the shelf life of chicken slices has been tested and evaluated
Nanocomposites Based on PCL and Halloysite Nanotubes Filled with Lysozyme: Effect of Draw Ratio on the Physical Properties and Release Analysis
No full textHalloysite nanotubes (HNTs) were loaded with lsozyme, as antimicrobial molecule, at a HNTs/lysozyme ratio of 1:1. Such a nano-hybrid was incorporated into a poly (ε-caprolactone) (PCL) matrix at 10 wt % and films were obtained. The nano-composites were submitted to a cold drawn process at three different draw ratios, λ = 3, 4, and 5, where λ is l(final length)/l0(initial length). Morphology, physical, and barrier properties of the starting nanocomposite and drawn samples were studied, and correlated to the release of the lysozyme molecule. It was demonstrated that with a simple mechanical treatment it is possible to obtain controlled release systems for specific active packaging requirements
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