Exponential growth of layer-by-layer assembled coatings with well-dispersed ultrafine nanofillers: a facile route to scratch-resistant and transparent hybrid coatings

Liu, Xiaokong; Lu, Zhou; Liu, Feng; Ji, Mingyang; Tang, Wenge; Pang, Meijuan; Sun, Junqi

doi:10.1039/c0jm00900h

Cited by 36 publications

(38 citation statements)

References 52 publications

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“…PEI and PAA are weak polyelectrolytes that exhibit pH-dependent electrostatic charge densities in aqueous solution 13 . The thickness and mass of PEI/PAA and PEI/nanoclay coatings can be adjusted by changing the pH and salt concentration of the solutions used for LbL assembly because changes in charge density affect polymer chain conformation and diffusion in-and-out of previously deposited layers 10,[14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite-coated porous templates for engineered bone scaffolds: a parametric study of layer-by-layer assembly conditions

et al. 2019

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Using the layer-by-layer (LbL) assembly technique to deposit mechanically reinforcing coatings onto porous templates is a route for fabricating engineered bone scaffold materials with a combination of high porosity, strength, and stiffness. LbL assembly involves the sequential deposition of nano-to micro-scale multilayer coatings from aqueous solutions. Here, a design of experiments (DOE) approach was used to evaluate LbL assembly of polyethyleneimine (PEI), polyacrylic acid (PAA), and nanoclay coatings onto open-cell polyurethane foam templates. The thickness of the coatings, and the porosity, elastic modulus and collapse stress of coated foam templates were most strongly affected by the pH of PAA solutions, salt concentration, and interactions between these factors. The mechanical properties of coated foams correlated with the thickness of the coatings, but were also ascribed to changes in the coating properties due to the different assembly conditions. A DOE optimization aimed to balance the trade-off between higher mechanical properties but lower porosity of foam templates with increasing coating thickness. Micromechanical modelling predicted that deposition of 116 QLs would achieve mechanical properties of cancellous bone (>0.05 GPa stiffness and >2 MPa strength) at a suitable porosity of >70%. When capped with a final layer of PAA and cross-linked via thermal treatment, the PEI/PAA/PEI/nanoclay coatings exhibited good indirect cytotoxicity with mesenchymal stem cells. The ability of LbL assembly to deposit a wide range of functional constituents within multilayer-structured coatings makes the general strategy of templated LbL assembly a powerful route for fabricating engineered tissue scaffolds that can be applied onto various porous template materials to achieve a wide range of properties, pore structures, and multifunctionality.

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Section: Introductionmentioning

confidence: 99%

Nanocomposite-coated porous templates for engineered bone scaffolds: a parametric study of layer-by-layer assembly conditions

et al. 2019

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“…However, they cover a larger area on the substrate and their optical transmittance is compromised. The oscillation of the UV-Vis curves correspond to Fabry-Pérot fringes that result from the interference of partially transmitted and partially reflected light at the Ag surface/air and Ag/PEN interfaces [31,32] The mechanical behavior of such structures is of paramount importance for flexible electronics manufacturing and service conditions. The monotonic uniaxial tensile loading of Ag micro-patterned lines - Fig.…”

Section: Resultsmentioning

confidence: 99%

Direct writing and electro-mechanical characterization of Ag micro-patterns on polymer substrates for flexible electronics

et al. 2015

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There is currently a great interest in developing flexible electrodes. Such components are used in most electronic devices from displays to solar cells to flexible sensors. To date most of them are fabricated using expensive vacuum techniques, and are based on transparent conducting oxides. These oxides are not entirely compatible with flexible substrates under the application of mechanical stresses, due to their brittle nature. Therefore, there is a need to explore novel low-cost, large-area fabrication methods to deposit alternative conducting materials with enhanced electro-mechanical performance. This work focuses on Ag patterns fabricated at low temperatures (below 150°C) on flexible polyethylene naphthalate utilizing a robotic printing approach. Such lithography-free method minimizes material waste by printing exact amounts of inks on digitally predefined locations. Additionally, it allows a broad feature size range, from a few μm to a few mm, and a variety of ink viscosities for better pattern control. We investigate the synthesis and direct writing of Ag particle-based inks, patterned-on-flex as lines and grids in the μm scale. We report on a high-yield ink synthesis method (~61.6%) with controlled particle size. It is found that the electrical resistivity (1.75 * 10 −4 Ω cm) of the patterns is in the same range with similar particlebased conductive components. The correlation between annealing temperature, microstructural evolution, and electrical performance is established. Also, the optical transmittance of the patterns can be controlled to meet specific application requirements by regulating the substrate surface area covered. Finally, the mechanical behavior under both monotonic and cyclic conditions shows a superior performance compared to brittle counterparts and underlines the potential of such metallic micro-patterns to be utilized in a wide range of flexible electronic applications. It is believed that direct writing of Ag patterns on compliant substrates may hold the key in developing the next generation of truly flexible devices.

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“…The biggest problem in the preparation of nanographite -reinforced composites reside in efficient dispersion of nanographite. It has been widely reported that uniform dispersion of the nanofillers is a critically important requirement to achieve polymer composites with highly enhanced performance (4,5). Thus, a significant challenge in developing high-performance polymer/nanographite composites is to achieve better dispersion and strong interfacial interactions.…”

Section: Introductionmentioning

confidence: 99%

Modification of PMMA/graphite nanocomposites through ion beam technique

Singhal

Rattan

Avasthi

et al. 2013

Radiation Effects and Defects in Solids

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Swift heavy ion (SHI) irradiation is a special technique for inducing physical and chemical modifications in bulk materials. In the present work, the SHI hs been used to prepare nanocomposites with homogeneously dispersed nanoparticles. The nanographite was synthesized from graphite using the intercalation-exfoliation method. PMMA Poly(methyl methacrylate)/graphite nanocomposites have been synthesized by in situ polymerization. The prepared PMMA/graphite nanocomposite films were irradiated with SHI irradiation (Ni ion beam, 80 MeV and C ion beam, 50 MeV) at a fluence of 1 × 10 10 to 3 × 10 12 ions/cm 2 . The nanocomposite films were characterized by scanning electron microscope (SEM) and were evaluated for their electrical and sensor properties. After irradiation, significant changes in surface morphology of nanocomposites were observed as evident from the SEM images, which show the presence of well-distributed nanographite platelets. The irradiated nanocomposites exhibit better electrical and sensor properties for the detection of nitroaromatics with marked improvement in sensitivity as compared with unirradiated nanocomposites.

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Exponential growth of layer-by-layer assembled coatings with well-dispersed ultrafine nanofillers: a facile route to scratch-resistant and transparent hybrid coatings

Cited by 36 publications

References 52 publications

Nanocomposite-coated porous templates for engineered bone scaffolds: a parametric study of layer-by-layer assembly conditions

Nanocomposite-coated porous templates for engineered bone scaffolds: a parametric study of layer-by-layer assembly conditions

Direct writing and electro-mechanical characterization of Ag micro-patterns on polymer substrates for flexible electronics

Modification of PMMA/graphite nanocomposites through ion beam technique

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