Carvone-loaded LDPE films for active packaging: Effect of supercritical CO2-assisted impregnation on loading, mechanical and transport properties of the films

2018 ◽  
Vol 133 ◽  
pp. 278-290 ◽  
Author(s):  
María L. Goñi ◽  
Nicolás A. Gañán ◽  
Raquel E. Martini ◽  
Alfonsina E. Andreatta
Keyword(s):  
Transport Properties ◽  
Supercritical Co2 ◽  
Active Packaging ◽  
Packaging Effect

scholarly journals Obtaining Active Polylactide (PLA) and Polyhydroxybutyrate (PHB) Blends Based Bionanocomposites Modified with Graphene Oxide and Supercritical Carbon Dioxide (scCO2)-Assisted Cinnamaldehyde: Effect on Thermal-Mechanical, Disintegration and Mass Transport Properties

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3968
Author(s):  
Carolina Villegas ◽  
Alejandra Torres ◽  
Julio Bruna ◽  
María Ignacia Bustos ◽  
Alvaro Díaz-Barrera ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Graphene Oxide ◽  
Supercritical Carbon Dioxide ◽  
Mass Transport ◽  
Transport Properties ◽  
Active Compound ◽  
Supercritical Co2 ◽  
Impregnation Process ◽  
Elongation Percentage

Bionanocomposites based on Polylactide (PLA) and Polyhydroxybutyrate (PHB) blends were successfully obtained through a combined extrusion and impregnation process using supercritical CO2 (scCO2). Graphene oxide (GO) and cinnamaldehyde (Ci) were incorporated into the blends as nano-reinforcement and an active compound, respectively, separately, and simultaneously. From the results, cinnamaldehyde quantification values varied between 5.7% and 6.1% (w/w). When GO and Ci were incorporated, elongation percentage increased up to 16%, and, therefore, the mechanical properties were improved, with respect to neat PLA. The results indicated that the Ci diffusion through the blends and bionanocomposites was influenced by the nano-reinforcing incorporation. The disintegration capacity of the developed materials decreased with the incorporation of GO and PHB, up to 14 and 23 days of testing, respectively, without compromising the biodegradability characteristics of the final material.

Effects of Supercritical CO2 Drying and Photoresist Strip on Low-k Films

2003 ◽  
Vol 766 ◽  
Author(s):  
R.F. Reidy ◽  
Zhengping Zhang ◽  
R.A. Orozco-Teran ◽  
B.P. Gorman ◽  
D.W. Mueller
Keyword(s):  
Dielectric Constant ◽  
Porous Materials ◽  
Transport Properties ◽  
Supercritical Co2 ◽  
Polar Molecule ◽  
Interlayer Dielectric ◽  
Highly Porous Materials ◽  
Supercritical Co2 Drying ◽  
Low K ◽  
Highly Porous

AbstractFuture interlayer dielectric (ILD) requirements necessitate reductions in dielectric constant to 2.1 within four years. Due to gaseous-like transport properties and near liquid-like densities, supercritical methods have been developed to dry and strip resist from these highly porous materials. Although a non-polar molecule, the solvating capability of supercritical CO2 (SCCO2) can be tailored by varying pressure, temperature, and co-solvents. This flexibility has been employed to remove photoresist and moisture from porous low-k films. The results of these experiments have been characterized using FTIR, ellipsometry, and SEM.

Supercritical CO2 impregnation of α-tocopherol into PET/PP films for active packaging applications

2019 ◽  
Vol 34 ◽  
pp. 266-273 ◽  
Author(s):  
Paola Franco ◽  
Loredana Incarnato ◽  
Iolanda De Marco
Keyword(s):  
Supercritical Co2 ◽  
Active Packaging

Chitosan‐nanocomposites as a food active packaging: Effect of addition of tocopherol and modified montmorillonite

2021 ◽  
Author(s):  
Marali Vilela Dias ◽  
Viviane Machado Azevedo ◽  
Laura Fonseca Ferreira ◽  
Ana Carolina Salgado Oliveira ◽  
Soraia Vilela Borges ◽  
...  
Keyword(s):  
Active Packaging ◽  
Modified Montmorillonite ◽  
Packaging Effect

Spectroscopic Diagnostics of Tokamaks

1988 ◽  
Vol 102 ◽  
pp. 165-174
Author(s):  
C. de Michelis
Keyword(s):  
Transport Properties ◽  
Power Losses ◽  
Spectroscopic Diagnostics ◽  
Important Concern

AbstractImpurities being an important concern in tokamaks, spectroscopy plays a key role in their understanding. Techniques for the evaluation of concentrations, power losses and transport properties are surveyed, and a few developments are outlined.

Structure and Orientation of As Precipitates in LT-MBE Grown GaAs

1991 ◽  
Vol 49 ◽  
pp. 900-901 ◽  
Author(s):  
Alain Claverie ◽  
Zuzanna Liliental-Weber
Keyword(s):  
Transport Properties ◽  
Layer Thickness ◽  
Growth Temperature ◽  
Low Temperatures ◽  
Lattice Parameter ◽  
Crystalline Quality ◽  
Insulating Properties ◽  
Lt Gaas

GaAs layers grown by MBE at low temperatures (in the 200°C range, LT-GaAs) have been reported to have very interesting electronic and transport properties. Previous studies have shown that, before annealing, the crystalline quality of the layers is related to the growth temperature. Lowering the temperature or increasing the layer thickness generally results in some columnar polycrystalline growth. For the best “temperature-thickness” combinations, the layers may be very As rich (up to 1.25%) resulting in an up to 0.15% increase of the lattice parameter, consistent with the excess As. Only after annealing are the technologically important semi-insulating properties of these layers observed. When annealed in As atmosphere at about 600°C a decrease of the lattice parameter to the substrate value is observed. TEM studies show formation of precipitates which are supposed to be As related since the average As concentration remains almost unchanged upon annealing.

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