scholarly journals Superhydrophobic Bio-Coating Made by Co-Continuous Electrospinning and Electrospraying on Polyethylene Terephthalate Films Proposed as Easy Emptying Transparent Food Packaging

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 364 ◽  
Author(s):  
Maria Pardo-Figuerez ◽  
Alex López-Córdoba ◽  
Sergio Torres-Giner ◽  
José Lagaron
Keyword(s):  
Contact Angle ◽  
Polyethylene Terephthalate ◽  
Water Contact Angle ◽  
Food Packaging ◽  
Functional Performance ◽  
Surface Hydrophobicity ◽  
Sliding Angle ◽  
Water Contact ◽  
Pet Films ◽  
Pet Substrate

Interest in coated films with micro/nanofeatures has grown rapidly in recent years due to their enhanced functional performance and better durability under demanding contact conditions or aggressive environments. In the current work, it is reported a one-step co-continuous bilayer coating process to generate a multilayer film that rendered superhydrophobicity to a polyethylene terephthalate (PET) substrate. A continuous coating based on ultrathin polylactide (PLA) fibers was deposited onto PET films by means of electrospinning, which increased the water contact angle of the substrate. Sequentially, nanostructured silica (SiO2) microparticles were electrosprayed onto the coated PET/PLA films to achieve superhydrophobic behavior. This multilayer was then treated at different annealing temperatures, that is, 150 °C, 160 °C, and 170 °C, in order to create interlayers’ adhesion to each other and to the substrate. It was found that co-continuous deposition of PLA fibers and nanostructured SiO2 microparticles onto PET films constituted a useful strategy to increase the surface hydrophobicity of the PET substrate, achieving an optimal apparent water contact angle of 170° and a sliding angle of 6°. Unfortunately, a reduction in background transparency was observed compared to the uncoated PET film, especially after electrospraying of the SiO2 microparticles but the films were seen to have a good contact transparency. The materials developed show significant potential in easy emptying transparent food packaging applications.

scholarly journals Transparent superhydrophobic PTFE films via one-step aerosol assisted chemical vapor deposition

RSC Advances ◽  
2017 ◽  
Vol 7 (47) ◽  
pp. 29275-29283 ◽  
Author(s):  
Aoyun Zhuang ◽  
Ruijin Liao ◽  
Sebastian C. Dixon ◽  
Yao Lu ◽  
Sanjayan Sathasivam ◽  
...  
Keyword(s):  
Contact Angle ◽  
Chemical Vapor Deposition ◽  
Water Contact Angle ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Sliding Angle ◽  
Water Contact ◽  
Visible Transmittance ◽  
One Step

Hierarchical micro/nano-structured transparent superhydrophobic polytetrafluoroethylene films with water contact angle 168°, water sliding angle <1° and visible transmittance >90% were prepared on glass via aerosol-assisted chemical vapor deposition.

Hydrophobic Performance of Core/Shell Nanoarrays Modified by Stearic Acid

2020 ◽  
Vol 15 (2) ◽  
pp. 264-268
Author(s):  
Hongxing Han ◽  
Lin Pan ◽  
Manying Zhang ◽  
Lei Zhao ◽  
Zhifeng Liu
Keyword(s):  
Contact Angle ◽  
Stearic Acid ◽  
Water Contact Angle ◽  
Zno Nanorods ◽  
Hydrophobic Surface ◽  
Optical Transmittance ◽  
Surface Hydrophobicity ◽  
Core Shell ◽  
Water Contact ◽  
Angle Measurements

In this paper, we successfully prepare hydrophobic surface of ZnO/ZnS nanorods arrays modified by stearic acid. The morphology, microstructure, optical transmittance and self-cleaning property are examined by SEM, XRD, UV-vis and water contact angle measurements, respectively. The ZnO/ZnS core/shell nanoarrays shows a higher value of water contact angle in compare with that of pure ZnO nanorods arrays. After treatment by stearic acid, the resulting ZnO/ZnS nanostructure exhibits the best hydrophobicity with water droplets about 146.5 . The results show that the surface hydrophobicity of ZnO/ZnS nanoarrays can be improved by using stearic acid with low-surface-energy.

scholarly journals High Stability Performance of Superhydrophobic Modified Fluorinated Graphene Films on Copper Alloy Substrates

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Rafik Abbas ◽  
N. Elkhoshkhany ◽  
Ahmed Hefnawy ◽  
Shaker Ebrahim ◽  
Aya Rahal
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sliding Angle ◽  
Water Contact ◽  
Stability Performance ◽  
Graphene Films ◽  
Superhydrophobic Property ◽  
Self Cleaning ◽  
Fluorinated Graphene ◽  
Highly Hydrophobic

A stable self-cleaning superhydrophobic modified fluorinated graphene surface with micro/nanostructure was successfully fabricated on copper substrates via drop coating process. Irregularly stacked island-like multilayered fluorinated graphene nanoflakes comprised the microstructure. The fabricated films exhibited outstanding superhydrophobic property with a water contact angle 167° and water sliding angle lower than 4°. The developed superhydrophobic surface showed excellent corrosion resistance with insignificant decrease of water contact angle 166° in 3.5 wt.% NaCl solution. This stable highly hydrophobic performance of the fluorinated graphene films could be useful in self-cleaning, antifogging, corrosion resistive coatings and microfluidic devices.

Facile Method to Prepare Superhydrophobic High-Density Polyethylene Coating

2013 ◽  
Vol 634-638 ◽  
pp. 2960-2963
Author(s):  
Xin Fu ◽  
Hui Fang Gong ◽  
Xi Mei Xiao
Keyword(s):  
Contact Angle ◽  
Aqueous Solutions ◽  
Water Contact Angle ◽  
High Density Polyethylene ◽  
High Density ◽  
Sliding Angle ◽  
Water Contact ◽  
Alkali Salt ◽  
Polyethylene Coating

A superhydrophobic HDPE coating was obtained by a facile but yet effective way. The water contact angle and sliding angle of the superhydrophobic HDPE coating were 156±1.9ºand 3±1.6º, respectively. The HDPE coating was still superhydrophobic contacting with acid, alkali, salt aqueous solutions.

Preparation and Characterization of Superhydrophobic Polypropylene Surface with Excellent Self-Cleaning Property

2011 ◽  
Vol 295-297 ◽  
pp. 1613-1616 ◽  
Author(s):  
Zhi Qing Yuan ◽  
Jun Liang Wu ◽  
Xi Hai Hao ◽  
Xu Nan Wang ◽  
Xun Meng Xu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Sliding Angle ◽  
Water Contact ◽  
Artificial Rain ◽  
Self Cleaning

A superhydrophobic polypropylene surface was obtained by a facile method. The water contact angle and sliding angle of the superhydrophobic polypropylene surface were 157±1.8ºand 1.6º, respectively. When the superhydrophobic polypropylene surface was contaminated, 99 % contaminant particles were removed from the superhydrophobic polypropylene surface by artificial rain, showing excellent self-cleaning property.

scholarly journals Pullulan–Apple Fiber Biocomposite Films: Optical, Mechanical, Barrier, Antioxidant and Antibacterial Properties

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 870
Author(s):  
Ângelo Luís ◽  
Ana Ramos ◽  
Fernanda Domingues
Keyword(s):  
Contact Angle ◽  
Water Vapor ◽  
Water Contact Angle ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Consumer Products ◽  
Vapor Permeability ◽  
P Value ◽  
Water Contact ◽  
Biocomposite Films

More than 150 million tons of synthetic plastics are produced worldwide from petrochemical-based materials, many of these plastics being used to produce single-use consumer products like food packaging. The main goal of this work was to research the production and characterization of pullulan–apple fiber biocomposite films as a new food packaging material. The optical, mechanical, and barrier properties of the developed biocomposite films were evaluated. Furthermore, the antioxidant and antibacterial activities of the biocomposite films were additionally studied. The results show that the Tensile Index and Elastic Modulus of the pullulan–apple fiber films were significantly higher (p-value < 0.05) when compared to the pullulan films. Regarding the water vapor permeability, no significant differences (p-value < 0.05) were observed in water vapor transmission rate (WVTR) when the apple fiber was incorporated into the biocomposite films. A significant increase (p-value < 0.05) of water contact angle in both sides of the films was observed when the apple fiber was incorporated into pullulan, indicating an increase in the hydrophobicity of the developed biocomposite films. It is worth noting the hydrophobicity of the (rough) upper side of the pullulan–apple fiber films, which present a water contact angle of 109.75°. It was possible to verify the microbial growth inhibition around the pullulan–apple fiber films for all the tested bacteria.

scholarly journals Facile Fabrication of Breathable and Superhydrophobic Fabric Based on Silica Nanoparticles and Amino‐Modified Polydimethylsiloxane

2020 ◽  
Author(s):  
Mahdi Hasanzadeh ◽  
Hossein Shahriyari Far ◽  
Aminoddin Haji ◽  
Giuseppe Rosace
Keyword(s):  
Contact Angle ◽  
Silica Nanoparticles ◽  
Water Contact Angle ◽  
Average Particle Size ◽  
Hydrophobic Surface ◽  
Water Repellency ◽  
Average Particle ◽  
Sliding Angle ◽  
Water Contact ◽  
Fabric Surface

This work attempted to fabricate superhydrophobic fabric via simple immersion technique. Textile fabrics were coated with silica nanoparticles prepared from tetraethoxysilane (TEOS) to obtain sufficient roughness with hydrophobic surface chemistry. Then the coated fabrics were treated with polydimethylsiloxane (PDMS) and aminopropyltriethoxysilane (APTES) to reduce the surface energy. The effects of PDMS concentration on the surface morphology and superhydrophobicity of as-prepared fabric were investigated. The morphology and the composition of superhydrophobic fabric was characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDS) and Fourier transform infrared (FTIR) spectroscopy. The results revealed the formation of spherical silica nanoparticles with average particle size of 250 nm throughout the fabric surface. The possible interactions between silica nanoparticles and APTES, as well as the fabrics were elucidated. Investigating the hydrophobicity of fabrics via water contact angle (WCA) measurement showed that the treated fabric exhibits excellent water repellency with a water contact angle as high as 151&deg; and a very low water sliding angle. It also found that the treated fabric maintained most of its hydrophobicity against repeated washing. The comfort properties of the obtained superhydrophobic fabrics in term of air permeability and bending length did not reveal any significant changes.

Preparation and Characterization of Waterborne Fluorinated Polyurethane-Acrylate

2017 ◽  
Vol 753 ◽  
pp. 60-64
Author(s):  
Wei Yang ◽  
Ming Jian Song ◽  
Bin Xie ◽  
Yue Jing Zhou
Keyword(s):  
Contact Angle ◽  
Phase Separation ◽  
Water Contact Angle ◽  
Film Surface ◽  
Surface Hydrophobicity ◽  
Toluene Diisocyanate ◽  
Water Contact ◽  
Obvious Effect ◽  
Fluorinated Polyurethane ◽  
Polyurethane Acrylate

Fluorinated urethane-acrylic monomer (FUA) was synthesized using toluene diisocyanate (TDI), 1H, 1H, 2H, 2H-Perfluorooctanol(FOH) as well as hydroxyethyl methacrylate(HEMA), and then applied to prepare waterborne fluorinated polyurethane-acrylate (FPUA) via emulsion polymerization. The effect of FUA content on surface properties of latex films was evaluated by means of nuclear magnetic resonance (1H NMR), atomic force microscope (AFM) and water contact angle test. It is shown that FUA monomer content is related to phase separation of the film surface and water contact angle. As FUA content was increased from 0 wt% to 11.8 wt%, water contact angle was increased from 84° to 104.5°. Further increase of FUA has little influence on surface hydrophobicity but obvious effect on surface phase separation, and the reason which led to this phenomenon is described.

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