Sustainable, self-cleaning, transparent, and moisture/oxygen-barrier coating films for food packaging

Abstract

Food packaging requirements of gas barrier and self-cleaning are satisfied with the use of bio-renewable cellulose, chitosan, silica, and sunflower oil.

Cephalopods Inspired Rapid Self-Healing Nanoclay Composite Coatings with Oxygen Barrier and Super-Bubble-Phobic Properties

“…Fresnel equations, the refractive index of an LbL coating can be estimated using a simple mixing rule: 47,48 𝑛 𝑙 = 𝑓 𝑎𝑖𝑟 𝑛 𝑎𝑖𝑟 + 𝑓 𝑝𝑜𝑙𝑦𝑒𝑐𝑎𝑡𝑖𝑜𝑛 𝑛 𝑝𝑜𝑙𝑦𝑐𝑎𝑡𝑖𝑜𝑛 + 𝑓 𝑝𝑜𝑙𝑦𝑎𝑛𝑖𝑜𝑛 𝑛 𝑝𝑜𝑙𝑦𝑎𝑛𝑖𝑜𝑛 + 𝑓 𝑎𝑑𝑑𝑖𝑡𝑖𝑣𝑒 𝑛 𝑎𝑑𝑑𝑖𝑡𝑖𝑣𝑒 (1) where 𝑓 𝑥 is the volume fraction, and 𝑛 𝑥 is the refractive index of component 𝑥. The decrease in refractive index leads to a decrease in the surface scattering of the film.…”

“…Oxygen barrier thin films and coatings for packaging applications are of great interest for the stable protection of food, pharmaceuticals, and electronic devices. [1][2][3] In particular, in food packaging, it is an important technology to reduce oxygen permeability, which can inhibit food deterioration and consequently lead to food waste. 4,5 Conventional packaging technology consists of building a multi-layered structure using lamination, vapor deposition, and other methods.…”

Protective Face Masks: Current Status and Future Trends

“…Hydroalcoholic extracts of clove buds, olive leaves, and green tea containing antiviral polyphenols were employed to modify nonwoven PP fabric masks and showed no cytotoxic effects in HeLa and MRC5 cell lines . Antiviral poly­(ethylenimine) was chosen for its low toxicity to chemically modify the surface of low-cost nonwoven cellulosic fiber filters, while chitosan, which is a bio-based material that exhibits relatively low toxicity, , and thus poses little risk in the case of inhalation by the mask user, has been proposed as an antimicrobial coating for biodegradable multiuse face mask filters . Moreover, two different nonwoven antimicrobial fabrics functionalized by dip-coating in two types of commercial cranberry extracts have shown no toxicity in a Caenorhabditis elegans in vivo model …”

Gas permeation and microstructure of reduced graphene oxide/polyethyleneimine multilayer films createdviarecast and layer-by-layer deposition processes

“…1 Over years, packaging lms designed to protect these items from reactive gases and water molecules have attracted strong scientic and technological interest. [2][3][4] Many barrier solutions have been successfully developed in the past 20-30 years, including metallized plastic lms, 5 SiO x , 6,7 and composite lms. [2][3][4][5][6][7][8][9][10][11] Most inorganic lms show excellent intrinsic barrier behavior, but many of them tend to be compromised by pinholes or defects aer being bent or stretched.…”

“…[2][3][4] Many barrier solutions have been successfully developed in the past 20-30 years, including metallized plastic lms, 5 SiO x , 6,7 and composite lms. [2][3][4][5][6][7][8][9][10][11] Most inorganic lms show excellent intrinsic barrier behavior, but many of them tend to be compromised by pinholes or defects aer being bent or stretched. [5][6][7][8] Polymer-based barrier lms are more exible and have better mechanical properties, but their microstructure and barrier property are sensitive to the external environment, resulting in degradation over time.…”