Ultrathin Hybrid Films of Polyoxohydroxy Clusters and Proteins: Layer-by-Layer Assembly and Their Optical and Mechanical Properties

Langmuir ◽  
2014 ◽  
Vol 30 (18) ◽  
pp. 5248-5255 ◽  
Author(s):  
You-Xian Yan ◽  
Hong-Bin Yao ◽  
Scott E. Smart ◽  
Li-Bo Mao ◽  
Wei Hu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Layer By Layer ◽  
Hybrid Films ◽  
Layer By Layer Assembly ◽  
Optical And Mechanical Properties ◽  
Layer Assembly

Strongly coupled polypyrrole/molybdenum oxide hybrid films via electrochemical layer-by-layer assembly for pseudocapacitors

2019 ◽  
Vol 7 (16) ◽  
pp. 9815-9821 ◽  
Author(s):  
Ming-Yue Zhang ◽  
Yu Song ◽  
Di Guo ◽  
Duo Yang ◽  
Xiaoqi Sun ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Molybdenum Oxide ◽  
Valence State ◽  
Hybrid Film ◽  
Layer By Layer ◽  
Hybrid Films ◽  
Strongly Coupled ◽  
Layer By Layer Assembly ◽  
Kinetics Of ◽  
Layer Assembly

A strongly coupled layer-by-layer (LbL) PPy/MoOx hybrid film is demonstrated. The spectroscopy results indicate the protonation level of PPy is enhanced and the valence state of Mo in MoOx is reduced, which synergistically improve the charge transfer kinetics of the composites.

Flame behavior and mechanical properties of polyester fabrics coated with intumescent coatings via layer-by-layer assembly

2019 ◽  
Vol 89 (21-22) ◽  
pp. 4691-4701 ◽  
Author(s):  
Warunee Wattanatanom ◽  
Sireerat Charuchinda ◽  
Pranut Potiyaraj
Keyword(s):  
Mechanical Properties ◽  
Flame Retardancy ◽  
Layer By Layer ◽  
Typical Structure ◽  
Polyester Fabrics ◽  
Intumescent Coatings ◽  
Layer By Layer Assembly ◽  
Assembly Technique ◽  
Coated Fabrics ◽  
Layer Assembly

Intumescent coatings consisting of branched-polyethyleneimine (BPEI) and ammonium polyphosphate (APP) solution were successfully applied on polyester fabrics by the layer-by-layer assembly technique to enhance the flame retardant and anti-dripping properties of polyester fabrics. The surface morphology of fabrics revealed that the coatings thoroughly covered the fabrics. The assessment of the vertical burning test of thin material (UL-94 rating VTM 0) indicated that the flame retardancy of coated polyester fabrics was improved significantly as compared with the uncoated fabric. The self-extinguishing ability and anti-dripping behaviors of coated polyester fabrics were also enhanced markedly. The improvement of flame retardancy depends on the number of coating layers and the amount of APP. However, after washing, the flame retardancy decreases to some extent. The morphology of char exhibits the typical structure of intumescent char on coated fabrics. The assessment of mechanical properties revealed that the intumescent coating via layer-by-layer assembly did not deteriorate the strength of the fabric. The increasing number of coated layers leads to the slight increase of the breaking force of the fabric; however, the increasing number of layers and the increasing amount of prepared APP lead to increased rigidity of the fabrics.

Complex formation of modified chitosan and carboxymethyl cellulose and its effect on paper properties

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 29-35 ◽  
Author(s):  
PEDRAM FATEHI ◽  
LIYING QIAN ◽  
RATTANA KITITERAKUN ◽  
THIRASAK RIRKSOMBOON ◽  
HUINING XIAO
Keyword(s):  
Carboxymethyl Cellulose ◽  
Polymer System ◽  
Layer By Layer ◽  
Paper Strength ◽  
Anionic Polymer ◽  
Paper Properties ◽  
Modified Chitosan ◽  
Layer By Layer Assembly ◽  
Polyelectrolyte Titration ◽  
Layer Assembly

The application of an oppositely charged dual polymer system is a promising approach to enhance paper strength. In this work, modified chitosan (MCN), a cationic polymer, and carboxymethyl cellulose (CMC), an anionic polymer, were used sequentially to improve paper strength. The adsorption of MCN on cellulose fibers was analyzed via polyelectrolyte titration. The formation of MCN/CMC complex in water and the deposition of this complex on silicon wafers were investigated by means of atomic force microscope and quasi-elastic light scattering techniques. The results showed that paper strength was enhanced slightly with a layer-by-layer assembly of the polymers. However, if the washing stage, which was required for layer-by-layer assembly, was eliminated, the MCN/CMC complex was deposited on fibers more efficiently, and the paper strength was improved more significantly. The significant improvement was attributed to the extra development of fiber bonding, confirmed further by scanning electron microscope observation of the bonding area of fibers treated with or without washing. However, the brightness of papers was somewhat decreased by the deposition of the complex on fibers. Higher paper strength also was achieved using rapid drying rather than air drying.

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