scholarly journals Oxygen-Scavenging Multilayered Biopapers Containing Palladium Nanoparticles Obtained by the Electrospinning Coating Technique

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 262 ◽  
Author(s):  
Adriane Cherpinski ◽  
Piotr Szewczyk ◽  
Adam Gruszczyński ◽  
Urszula Stachewicz ◽  
Jose Lagaron
Keyword(s):  
Palladium Nanoparticles ◽  
Food Packaging ◽  
Ion Beam ◽  
Barrier Properties ◽  
Oxygen Absorption ◽  
Coating Technique ◽  
Water Barrier ◽  
Oxygen Scavenging ◽  
Scavenging Capacity ◽  
Focus Ion Beam

The main goal of this study was to obtain, for the first time, highly efficient water barrier and oxygen-scavenging multilayered electrospun biopaper coatings of biodegradable polymers over conventional cellulose paper, using the electrospinning coating technique. In order to do so, poly(3-hydroxybutyrate) (PHB) and polycaprolactone (PCL) polymer-containing palladium nanoparticles (PdNPs) were electrospun over paper, and the morphology, thermal properties, water vapor barrier, and oxygen absorption properties of nanocomposites and multilayers were investigated. In order to reduce the porosity, and to enhance the barrier properties and interlayer adhesion, the biopapers were annealed after electrospinning. A previous study showed that electrospun PHB-containing PdNP did show significant oxygen scavenging capacity, but this was strongly reduced after annealing, a process that is necessary to form a continuous film with the water barrier. The results in the current work indicate that the PdNP were better dispersed and distributed in the PCL matrix, as suggested by focus ion beam-scanning electron microscopy (FIB-SEM) experiments, and that the Pd enhanced, to some extent, the onset of PCL degradation. More importantly, the PCL/PdNP nanobiopaper exhibited much higher oxygen scavenging capacity than the homologous PHB/PdNP, due to most likely, the higher oxygen permeability of the PCL polymer and the somewhat higher dispersion of the Pd. The passive and active multilayered biopapers developed here may be of significant relevance to put forward the next generation of fully biodegradable barrier papers of interest in, for instance, food packaging.

Preparation, characterization, and oxygen scavenging capacity of biodegradable α-tocopherol/PLA microparticles for active food packaging applications

2015 ◽  
Vol 38 (5) ◽  
pp. 981-986 ◽  
Author(s):  
Paola Scarfato ◽  
Elvira Avallone ◽  
Maria Rosaria Galdi ◽  
Luciano Di Maio ◽  
Loredana Incarnato
Keyword(s):  
Food Packaging ◽  
Oxygen Scavenging ◽  
Scavenging Capacity ◽  
Active Food Packaging

scholarly journals Evaluation of the Potential of Modified Calcium Carbonate as a Carrier for Unsaturated Fatty Acids in Oxygen Scavenging Applications

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5000
Author(s):  
Bettina Röcker ◽  
Gabriel Mäder ◽  
Fabien Wilhelm Monnard ◽  
Magdalena Jancikova ◽  
Matthias Welker ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Calcium Carbonate ◽  
Surface Area ◽  
Food Packaging ◽  
Unsaturated Fatty Acids ◽  
Oxygen Absorption ◽  
Scavenging Activity ◽  
Oxygen Scavenger ◽  
Calcium Carbonates ◽  
Oxygen Scavenging

Modified calcium carbonates (MCC) are inorganic mineral-based particles with a large surface area, which is enlarged by their porous internal structure consisting of hydroxyapatite and calcium carbonate crystal structures. Such materials have high potential for use as carriers for active substances such as oxygen scavenging agents. Oxygen scavengers are applied to packaging to preserve the quality of oxygen-sensitive products. This study investigated the potential of MCC as a novel carrier system for unsaturated fatty acids (UFAs), with the intention of developing an oxygen scavenger. Linoleic acid (LA) and oleic acid (OA) were loaded on MCC powder, and the loaded MCC particles were characterized and studied for their oxygen scavenging activity. For both LA and OA, amounts of 20 wt% loading on MCC were found to provide optimal surface area/volume ratios. Spreading UFAs over large surface areas of 31.6 and 49 m2 g−1 MCC enabled oxygen exposure and action on a multitude of molecular sites, resulting in oxygen scavenging rates of 12.2 ± 0.6 and 1.7 ± 0.2 mL O2 d−1 g−1, and maximum oxygen absorption capacities of >195.6 ± 13.5 and >165.0 ± 2.0 mL g−1, respectively. Oxygen scavenging activity decreased with increasing humidity (37–100% RH) and increased with rising temperatures (5–30 °C). Overall, highly porous MCC was concluded to be a suitable UFA carrier for oxygen scavenging applications in food packaging.

scholarly journals Effects of palm wax on the physical, mechanical and water barrier properties of fish gelatin films for food packaging application

2020 ◽  
Vol 23 ◽  
pp. 100437 ◽  
Author(s):  
Sahid Nurul Syahida ◽  
Mohammad Rashedi Ismail-Fitry ◽  
Zuriyati Mohamed Asa’ari Ainun ◽  
Zainal Abedin Nur Hanani
Keyword(s):  
Food Packaging ◽  
Barrier Properties ◽  
Fish Gelatin ◽  
Water Barrier ◽  
Gelatin Films

Modeling the Water Barrier Properties of Nylon Film Intended for Food Packaging Applications

2003 ◽  
Vol 68 (4) ◽  
pp. 1334-1340 ◽  
Author(s):  
M.A. Nobile ◽  
G.G. Buonocore ◽  
C. Altieri ◽  
G. Battaglia ◽  
L. Nicolais
Keyword(s):  
Food Packaging ◽  
Barrier Properties ◽  
Water Barrier

scholarly journals Transparent and Robust All-Cellulose Nanocomposite Packaging Materials Prepared in a Mixture of Trifluoroacetic Acid and Trifluoroacetic Anhydride

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 368 ◽  
Author(s):  
Susana Guzman-Puyol ◽  
Luca Ceseracciu ◽  
Giacomo Tedeschi ◽  
Sergio Marras ◽  
Alice Scarpellini ◽  
...  
Keyword(s):  
Trifluoroacetic Acid ◽  
Food Packaging ◽  
Cellulose Nanofibers ◽  
Barrier Properties ◽  
Trifluoroacetic Anhydride ◽  
Packaging Films ◽  
Force Microscopy ◽  
Water Barrier ◽  
Cellulose Composites ◽  
Food Packaging Films

All-cellulose composites with a potential application as food packaging films were prepared by dissolving microcrystalline cellulose in a mixture of trifluoroacetic acid and trifluoroacetic anhydride, adding cellulose nanofibers, and evaporating the solvents. First, the effect of the solvents on the morphology, structure, and thermal properties of the nanofibers was evaluated by atomic force microscopy (AFM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA), respectively. An important reduction in the crystallinity was observed. Then, the optical, morphological, mechanical, and water barrier properties of the nanocomposites were determined. In general, the final properties of the composites depended on the nanocellulose content. Thus, although the transparency decreased with the amount of cellulose nanofibers due to increased light scattering, normalized transmittance values were higher than 80% in all the cases. On the other hand, the best mechanical properties were achieved for concentrations of nanofibers between 5 and 9 wt.%. At higher concentrations, the cellulose nanofibers aggregated and/or folded, decreasing the mechanical parameters as confirmed analytically by modeling of the composite Young’s modulus. Finally, regarding the water barrier properties, water uptake was not affected by the presence of cellulose nanofibers while water permeability was reduced because of the higher tortuosity induced by the nanocelluloses. In view of such properties, these materials are suggested as food packaging films.

scholarly journals Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2523
Author(s):  
Gregor Lavrič ◽  
Ana Oberlintner ◽  
Inese Filipova ◽  
Uroš Novak ◽  
Blaž Likozar ◽  
...  
Keyword(s):  
Contact Angle ◽  
Food Packaging ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Good Alternative ◽  
Bacterial Nanocellulose ◽  
Water Barrier ◽  
And Function

 The aim of the study was to characterize and compare films made of cellulose nanocrystals (CNC), nano-fibrils (CNF), and bacterial nanocellulose (BNC) in combination with chitosan and alginate in terms of applicability for potential food packaging applications. In total, 25 different formulations were made and evaluated, and seven biopolymer films with the best mechanical performance (tensile strength, strain)—alginate, alginate with 5% CNC, chitosan, chitosan with 3% CNC, BNC with and without glycerol, and CNF with glycerol—were selected and investigated regarding morphology (SEM), density, contact angle, surface energy, water absorption, and oxygen and water barrier properties. Studies revealed that polysaccharide-based films with added CNC are the most suitable for packaging purposes, and better dispersing of nanocellulose in chitosan than in alginate was observed. Results showed an increase in hydrophobicity (increase of contact angle and reduced moisture absorption) of chitosan and alginate films with the addition of CNC, and chitosan with 3% CNC had the highest contact angle, 108 ± 2, and 15% lower moisture absorption compared to pure chitosan. Overall, the ability of nanocellulose additives to preserve the structure and function of chitosan and alginate materials in a humid environment was convincingly demonstrated. Barrier properties were improved by combining the biopolymers, and water vapor transmission rate (WVTR) was reduced by 15–45% and oxygen permeability (OTR) up to 45% by adding nanocellulose compared to single biopolymer formulations. It was concluded that with a good oxygen barrier, a water barrier that is comparable to PLA, and good mechanical properties, biopolymer films would be a good alternative to conventional plastic packaging used for ready-to-eat foods with short storage time. 

scholarly journals Preparation and Characterization of Films Based on Disintegrated Bacterial Cellulose and Montmorillonite

2020 ◽  
Author(s):  
Agata Sommer ◽  
Hanna Staroszczyk ◽  
Izabela Sinkiewicz ◽  
Piotr Bruździak
Keyword(s):  
Bacterial Cellulose ◽  
Food Packaging ◽  
Barrier Properties ◽  
Packaging Material ◽  
Mechanical And Thermal Properties ◽  
Natural Polymers ◽  
Vapour Permeability ◽  
Water Barrier ◽  
Bond Network

AbstractThe food packaging materials from natural polymers including polysaccharides offer an ecologically important alternative to commonly used synthetic, non-biodegradable counterparts. The purpose of this work was to modify of bacterial cellulose (BC) leading to the improvement of its functional properties in terms of use as a food packaging material. Effects of disintegration of BC and addition of montmorillonite (MMT) on its water barrier, mechanical and thermal properties were investigated. Disintegration of BC increased its water vapour permeability (WVP) and thermal stability, but decreased its tensile strength (σ). These changes were closely related to the rearrangement of hydrogen-bond network in the BC structure, resulting in a partial conversion from the Iα to Iβ allomorph. The addition of 2% of MMT did not affect WVP and σ of the disintegrated BC (bBC), while the plasticization of the modified bBC generally decreased WVP, and did not increase σ. The improvement in water barrier properties of bBC modified by adding 2% of MMT in the presence of glycerol was caused by the formation of hydrogen bonds between the components of the composite. The results presented show the potential usefulness of BC modified by disintegration and adding 2% of MMT and 10–15% of glycerol as a food packaging material.

Focused Ion Beam (FIB) Method for Reconditioning Worn Tungsten Atomic Force Probe (AFP) Tips

2005 ◽  
Author(s):  
Randal E. Mulder ◽  
Sam Subramanian ◽  
Tony Chrastecky
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Minimal Amount ◽  
Atomic Force ◽  
Focus Ion Beam

Abstract Atomic force probing (AFP) uses very sharp tungsten tips (100nm in radius) which wear out rather quickly, even with the greater durability of tungsten as compared to silicon. This paper demonstrates how worn tips that no longer image and probe properly can be reconditioned using the focus ion beam (FIB) tool. The method works best for tips that are under approx. 750nm in diameter and are not bent. It works well for freshly manufactured tips that do not work properly due to mishandling or improper storage which allowed particulates/oxide to build up on the tip. The method also works well for fresh tips that have been worn down (or slightly bent) after several hours of scanning and probing. This method is straightforward and requires a minimal amount of time. Typically, four probe tips can be reconditioned in about 30 minutes on the FIB.

scholarly journals Low-Density Polyethylene Films Carrying ferula asafoetida Extract for Active Food Packaging: Thermal, Mechanical, Optical, Barrier, and Antifungal Properties

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Razieh Niazmand ◽  
Bibi Marzieh Razavizadeh ◽  
Farzaneh Sabbagh
Keyword(s):  
Polymer Matrix ◽  
Food Packaging ◽  
Barrier Properties ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Optical Barrier ◽  
Leaf Extracts ◽  
Polyethylene Films ◽  
Active Food Packaging ◽  
Ferula Asafoetida

The physical, thermal, mechanical, optical, microstructural, and barrier properties of low-density polyethylene films (LDPE) containing ferula asafoetida leaf and gum extracts were investigated. Results showed a reduction in elasticity and tensile strength with increasing extract concentration in the polymer matrix. The melting temperature and enthalpy increased with increasing concentration of extracts. The films containing extracts had lower L∗ and a∗ and higher b∗ indices. The films containing leaf extract had more barrier potential to UV than the gum extracts. The oxygen permeability in films containing 5% of leaf and gum extracts increased by 2.3 and 2.1 times, respectively. The morphology of the active films was similar to bubble swollen islands, which was more pronounced at higher concentrations of gum and leaf extracts. FTIR results confirmed some chemical interactions of ferula extracts with the polymer matrix. At the end of day 14th, the growth rate of Aspergillus niger and Saccharomyces cerevisea in the presence of the PE-Gum-5 reduced more than PE-Leaf-5 (3.7 and 2.4 logarithmic cycles, respectively) compared to the first day. Our findings showed that active LDPE films have desire thermo-mechanical and barrier properties for food packaging.

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