Polyelectrolyte Multilayer Films for Building Energetic Walking Devices

Ma, Ying; Zhang, Yuanyuan; Wu, Baisheng; Sun, Wei; Li, Zhengguang; Sun, Junqi

doi:10.1002/ange.201101054

Cited by 67 publications

(34 citation statements)

References 33 publications

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“…[1][2][3][4] LBL multilayer films are more versatile in many aspects than bulk materials because they have more precisely controlled composition and structure at nanoscale dimensions. 5 Many researchers have investigated freestanding LBL films.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ren

Guo

et al. 2015

J Polym Sci B Polym Phys

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The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied to fabricate a wide range of materials. LBL materials could improve optical transmittance and mechanical properties if the film components were covalently bonded. Covalently bonded nanocomposite multilayer films were prepared by employing hydrophilic aliphatic polyisocyanate (HAPI) as the reactive component, to react with Laponite and polyvinyl alcohol (PVA). FT-IR spectra suggested that HAPI reacted with Laponite and PVA at ambient temperature rapidly. Ellipsometry measurement showed that the film thickness was in linear growth. The influences of HAPI on the optical, mechanical and thermal properties of the films were investigated by UV-Vis spectroscopy, tensile stress measurement, DSC and TGA. The obtained results showed that the optical transmittance and mechanical strength were enhanced when the film components were covalently bonded by HAPI. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000 KEYWORDS: covalently bonded; layer-by-layer; nanocomposites; self-assembly; thin films INTRODUCTION The layer-by-layer (LBL) assembly technique is an attractive method to make functional multilayer thin films and has been applied in the fabrication of nanodevice, drug release, and biomimetic materials.1-4 LBL multilayer films are more versatile in many aspects than bulk materials because they have more precisely controlled composition and structure at nanoscale dimensions. 5 Many researchers have investigated freestanding LBL films.6-8 However, the LBL ultrathin film breaks or decomposes easily during the application, which is one of the main shortages that hampers the application of the materials.9 Covalent assembly is an effective strategy for improving the physical or chemical properties of the LBL films.10-12 Another approach is achieved by introducing inorganic materials such as Laponite, montmorillonite and carbon nanotube into the LBL multilayer films. [13][14][15][16] Researchers have employed hydrogen bond, dipolar bond, or electrostatic attraction between polymer and inorganic particles to fabricate nanocomposite LBL multilayer films. 17,18 This type of physical interaction, however, often leads to unstable multilayer films in strong acid, strong alkali or high humidity conditions.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Ren

Guo

et al. 2015

J Polym Sci B Polym Phys

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“…Twenty bilayers of macroinitiators were deposited, but to ensure high mechanical strength of the free‐standing macroinitiator, ten bilayers of PAA and PAH were deposited after the first ten macroinitiator bilayers. The thermally cross‐linked PAA/PAH film has an ultimate tensile strength of 96 ± 3 MPa and Young's modulus of 4.3 ± 0.1 GPa . The film was released from the surface by the dissolution of the cellulose acetate by acetone.…”

Section: Resultsmentioning

confidence: 99%

Free-Standing Macroinitiator Thin Film for Bifacial Polymer Chain Grafting

Leon

2015

Macromol. Chem. Phys.

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The study reports the fabrication of a free-standing reactive macroinitiator thin fi lm via simple layer-by-layer assembly and dissolution of the sacrifi cial layer. The resulting macroinitiator thin fi lm can be postfunctionalized by grafting polymer brush from it. Since the thin fi lm is free from any substrate, bifacial functionalization can be done on the free-standing fi lm. This approach is expected to signifi cantly increase the functionality of free-standing polymer brush for most applications like catalysis and sensor because of the increase in functional group density per area.

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“…The high diffusion of the polyelectrolytes during the LbL assembly process enables high mobility of the polyelectrolytes in LbL‐assembled films when subjected to external stimuli. [10d‐f], During the LbL assembly process, a high diffusion of polyelectrolytes into the polyelectrolyte films means that the polyelectrolyte complexation in the films is largely suppressed. Therefore, high polyelectrolyte diffusion usually produces polyelectrolyte films with a low electrostatic and/or hydrogen bonding cross‐linking density, which facilitates polyelectrolyte mobility in the resultant polyelectrolyte films under an external stimulus.…”

Section: Methodsmentioning

confidence: 99%

Layer‐by‐Layer‐Assembled Healable Antifouling Films

et al. 2015

Self Cite

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Healable antifouling films are fabricated by the exponential layer-by-layer assembly of PEGylated branched poly(ethylenimine) and hyaluronic acid followed by post-crosslinking. The antifouling function originates from the grafted PEG and the extremely soft nature of the films. The rapid and multiple healing of damaged antifouling functions caused by cuts and scratches can be readily achieved by immersing the films in normal saline solution.

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Polyelectrolyte Multilayer Films for Building Energetic Walking Devices

Cited by 67 publications

References 33 publications

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Preparation and characterization of covalently bonded PVA/Laponite/HAPI nanocomposite multilayer freestanding films by layer‐by‐layer assembly

Free-Standing Macroinitiator Thin Film for Bifacial Polymer Chain Grafting

Layer‐by‐Layer‐Assembled Healable Antifouling Films

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