Controlled shape deformation of bilayer films with tough adhesion between nanocomposite hydrogels and polymer substrates

2018 ◽  
Vol 6 (41) ◽  
pp. 6629-6636 ◽  
Author(s):  
Yu Li ◽  
Jia Yang ◽  
Xianqiang Yu ◽  
Xiangbin Sun ◽  
Feng Chen ◽  
...  
Keyword(s):  
Shape Deformation ◽  
Bilayer Film ◽  
Polymer Substrates ◽  
Nanocomposite Hydrogels ◽  
Bilayer Films ◽  
One Step ◽  
Step Polymerization

A bilayer film prepared by one-step polymerization exhibits self-bending and self-helixing behaviours by adjusting its geometry parameters.

scholarly journals Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1823
Author(s):  
Ivan Marić ◽  
Nataša Šijaković Vujičić ◽  
Anđela Pustak ◽  
Marijan Gotić ◽  
Goran Štefanić ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Ethylene Oxide ◽  
Molar Fraction ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Γ Irradiation ◽  
Nanocomposite Hydrogels ◽  
One Step ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
The One

Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step γ-irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. γ-irradiation dose and concentrations of Fe3+, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of γ-irradiation generated Fe2+ was performed using the 1,10-phenanthroline method. The maximal Fe2+ molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe3+. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe3+ content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.

One-Step In Situ Biosynthesis of Graphene Oxide-Bacterial Cellulose Nanocomposite Hydrogels

2014 ◽  
Vol 35 (19) ◽  
pp. 1706-1711 ◽  
Author(s):  
Hongjuan Si ◽  
Honglin Luo ◽  
Guangyao Xiong ◽  
Zhiwei Yang ◽  
Sudha R. Raman ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Bacterial Cellulose ◽  
Nanocomposite Hydrogels ◽  
One Step

Dopamine-Triggered One-Step Polymerization and Codeposition of Acrylate Monomers for Functional Coatings

2017 ◽  
Vol 9 (39) ◽  
pp. 34356-34366 ◽  
Author(s):  
Chao Zhang ◽  
Meng-Qi Ma ◽  
Ting-Ting Chen ◽  
He Zhang ◽  
Deng-Feng Hu ◽  
...  
Keyword(s):  
Functional Coatings ◽  
One Step ◽  
Acrylate Monomers ◽  
Step Polymerization

scholarly journals Effect of storage condition on the physico-chemical properties of corn–wheat starch/zein edible bilayer films

2020 ◽  
Vol 7 (2) ◽  
pp. 191777 ◽  
Author(s):  
Chen Chen ◽  
Yan Du ◽  
Guanjie Zuo ◽  
Fusheng Chen ◽  
Kunlun Liu ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Storage Time ◽  
Water Resistance ◽  
Storage Temperature ◽  
Barrier Properties ◽  
Wheat Starch ◽  
Bilayer Film ◽  
Oxygen Barrier ◽  
Cross Sectional ◽  
Bilayer Films

The functional properties of biopolymer-based film packaging materials are susceptible to external storage conditions. The effects of different storage temperature, relative humidity (RH) and duration on the apparent form, barrier properties, mechanical properties and microstructure of corn–wheat starch/zein bilayer films were studied. From 0 to 150 days, storage temperature and RH, but not storage time, affected the appearance and colour of the bilayer films. The increase in haze of the bilayer films stored at 25°C was much greater than that at low temperatures. With increased storage time, the moisture content first increased and then decreased, while the water resistance and oxygen barrier properties of the bilayer films worsened. After 150 days, the bilayer film stored at 25°C with 54% RH had better water resistance properties. The oxygen barrier properties of the bilayer film stored at 25°C with 43% RH were preferable to those of other groups because the peroxide value of vegetable oil packed in the former bilayer film was the lowest. The tensile strength of bilayer films stored at 25°C with RH of 43, 54 and 65% decreased, but was still better than those stored at low temperatures (−17°C, 4°C), which were tough due to their high elongation at break. Scanning electron microscopy results showed tight bonds between the bilayer films, and the network structure inside the films disappeared and reappeared during storage. The cross-sectional compactness changed, and there was no film separation after 150 days.

scholarly journals Effect of Sonication Duration in the Performance of Polyvinyl Alcohol/Chitosan Bilayer Films and Their Effect on Strawberry Preservation

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1408 ◽  
Author(s):  
Jie Ding ◽  
Rong Zhang ◽  
Saeed Ahmed ◽  
Yaowen Liu ◽  
Wen Qin
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Vapor Permeability ◽  
Ascorbic Acid Content ◽  
Titratable Acidity ◽  
Solid Content ◽  
Bilayer Film ◽  
Vapor Permeability ◽  
Soluble Solid Content ◽  
Health Food ◽  
Bilayer Films

In this study, we fabricated polyvinyl alcohol (PVA)/chitosan (CS) bilayer films by casting and investigated the effects of preparation conditions and CS content (2, 2.5, or 3 wt.%) on the ability of these films to preserve packaged strawberries. The best performance was achieved at a CS loading of 2.5 wt.% (ultrasound time, 25 min); the strain and stress values were 143.15 ± 6.43% and 70.67 ± 0.85 MPa, respectively, oxygen permeability was 0.16 ± 0.08 cm2·m2·day−1·MPa−1, water vapor permeability was 14.93 ± 4.09 g·cm−1·s−1·Pa−1, and the shelf life of fresh strawberries packaged in the PVA/CS 2.5 wt.% bilayer film was determined to be 21 days at 5 ± 2 °C and a relative humidity of 60 ± 5%. Treatment with PVA/CS bilayer films prevented the decrease in the firmness of strawberries during storage (21 days). The evaluated physicochemical parameters (weight loss, decay, firmness, titratable acidity, soluble solid content, ascorbic acid content, and color) indicated that treatment with PVA/CS bilayer films led to better maintenance of the fruit quality. We believe that our study makes a significant contribution to literature because it paves the way to the fabrication of smart packaging materials and facilitates the commercialization of fresh strawberries as an important health food.

Improving the photocatalytic activity of polyaniline and a porphyrin via oxidation to obtain a salt and a charge-transfer complex

2017 ◽  
Vol 41 (23) ◽  
pp. 14595-14601 ◽  
Author(s):  
Ramesh Gottam ◽  
Palaniappan Srinivasan ◽  
Duong Duc La ◽  
Sheshanath V. Bhosale
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Charge Transfer Complex ◽  
One Step ◽  
A Charge ◽  
Step Polymerization

Simple, efficient, and one-step polymerization of aniline to a novel polyaniline salt consisting of sulfate and porphyrin dopants as an efficient photocatalyst for dyes.

Resistive Switching in NiO Bilayer Films with Different Crystallinity Layers

2011 ◽  
Vol 470 ◽  
pp. 188-193 ◽  
Author(s):  
Koji Kita ◽  
Atsushi Eika ◽  
Tomonori Nishimura ◽  
Kosuke Nagashio ◽  
Akira Toriumi
Keyword(s):  
Resistive Switching ◽  
Film Deposition ◽  
Bilayer Film ◽  
Film Properties ◽  
Oxide Interfaces ◽  
Crystalline Film ◽  
Bilayer Films ◽  
Switching Characteristics ◽  
Nio Films ◽  
Deposition Conditions

Two kinds of NiO films with different crystallinity were fabricated by controlling the film deposition conditions. The well-crystalline film showed resistive switching characteristics whereas the poorly-crystalline film did not. From I-V characteristics of the NiO bilayer film consisting of those two kinds of films, it was found that the initial characteristics significantly differed according to the bias polarity. The forming voltage became lower and had less variety when the well-crystalline side was positively-biased. These results suggest that the forming voltage and currents are controllable by modifying the film properties at the metal-oxide interfaces.

Super-tough and thermo-healable hydrogel – promising for shape-memory absorbent fiber

2014 ◽  
Vol 2 (43) ◽  
pp. 7631-7638 ◽  
Author(s):  
Xinkun Lu ◽  
Ching Ying Chan ◽  
Ka I Lee ◽  
Pui Fai Ng ◽  
Bin Fei ◽  
...  
Keyword(s):  
Shape Memory ◽  
One Step ◽  
Step Polymerization

Super-tough and highly squeezable hydrogel by a one-step polymerization shows ultra extendability and healability and leads to a shape-memory absorbent fiber.

Sign in / Sign up

Export Citation Format

Share Document