Liquid crystalline inorganic nanosheets for facile synthesis of polymer hydrogels with anisotropies in structure, optical property, swelling/deswelling, and ion transport/fixation

Miyamoto, Nobuyoshi; Shintate, Morio; Ikeda, Shogo; Hoshida, Yasutomo; Yamauchi, Yusuke; Motokawa, Ryuhei; Annaka, Masahiko

doi:10.1039/c2cc36654a

Cited by 72 publications

(85 citation statements)

References 51 publications

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“…1(b) shows the typical TEM image of the BNNS. High flat and transparent properties are clearly visible, probably indicating that high-quality crystalline BNNSs have been achieved [12]- [14]. This is confirmed using a high-resolution TEM (HRTEM) microscope equipped with an imaging aberration corrector.…”

Section: Resultssupporting

confidence: 54%

Development of 2-D Boron Nitride Nanosheets UV Photoconductive Detectors

Aldalbahi

Feng

2015

IEEE Trans. Electron Devices

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We report on our new approach to low-temperature synthesis of high-quality single crystalline wide bandgap boron nitride nanosheets (BNNSs) semiconductor for the development of deep ultraviolet (UV) photoconductive detectors. We focus our experiments on studies of electrical and electronic properties, as well as sensitivity, response and recovery times, and repeatability of newly fabricated deep UV detectors. Raman scattering spectroscopy, X-ray diffraction, scanning electron microscope (SEM), transmission electron microscopy (TEM), and electrometers were used to characterize the BNNS photoconductive materials. The SEM and TEM measurements clearly indicate that each sample consists of a large amount of high-quality BNNSs. High transparency related to high quality of crystalline structures of BNNS has been identified. Based on the synthesized BNNSs, deep UV detector is designed, fabricated, and tested. High sensitivity, quick time responsivity <0.6 ms has been achieved.

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Section: Resultssupporting

confidence: 54%

Development of 2-D Boron Nitride Nanosheets UV Photoconductive Detectors

Aldalbahi

Feng

2015

IEEE Trans. Electron Devices

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“…Moreover, some research groups have developed nanocomposite hydrogels with ordered structures using techniques for assembling 2D nanosheets such as GO nanosheets, nanoclay, and some liquid-crystalline inorganic nanosheets. [133][134][135][136][137] These reported ordered structured nanocomposite hydrogels can serve as high-performance bioengineering materials for tissue engineering. Figure 7.…”

Section: Self-assemblymentioning

confidence: 99%

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

et al. 2017

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In the human body, many soft tissues with hierarchically ordered composite structures, such as cartilage, skeletal muscle, the corneas, and blood vessels, exhibit highly anisotropic mechanical strength and functionality to adapt to complex environments. In artificial soft materials, hydrogels are analogous to these biological soft tissues due to their “soft and wet” properties, their biocompatibility, and their elastic performance. However, conventional hydrogel materials with unordered homogeneous structures inevitably lack high mechanical properties and anisotropic functional performances; thus, their further application is limited. Inspired by biological soft tissues with well‐ordered structures, researchers have increasingly investigated highly ordered nanocomposite hydrogels as functional biological engineering soft materials with unique mechanical, optical, and biological properties. These hydrogels incorporate long‐range ordered nanocomposite structures within hydrogel network matrixes. Here, the critical design criteria and the state‐of‐the‐art fabrication strategies of nanocomposite hydrogels with highly ordered structures are systemically reviewed. Then, recent progress in applications in the fields of soft actuators, tissue engineering, and sensors is highlighted. The future development and prospective application of highly ordered nanocomposite hydrogels are also discussed.

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“…The self-alignment of large aspect ratio polymer-coated nanoclays can be rationalized due to the formation of nematic liquid-crystalline phases, whose critical concentration depends on the aspect ratio ( Supplementary Fig. 4) 56,57 . For the ultrasmall PVA-coated LAP nanoclay, the behaviour is however less self-evident, as the cationic rim regions can in principle interact with the anionic basal planes to form edge-on-plane structures, also known as 'house of cards' structure 48,58 .…”

Section: Strategy and Building Blocks And Structural Characterizationmentioning

confidence: 99%

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

et al. 2015

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Nacre-mimetics hold great promise as mechanical high-performance and functional materials. Here we demonstrate large progress of mechanical and functional properties of self-assembled polymer/nanoclay nacre-mimetics by using synthetic nanoclays with aspect ratios covering three orders in magnitude (25-3,500). We establish comprehensive relationships among structure formation, nanostructuration, deformation mechanisms and mechanical properties as a function of nanoclay aspect ratio, and by tuning the viscoelastic properties of the soft phase via hydration. Highly ordered, large-scale nacre-mimetics are obtained even for low aspect ratio nanoplatelets and show pronounced inelastic deformation with very high toughness, while those formed by ultralarge nanoplatelets exhibit superb stiffness and strength, previously only reachable for highly crosslinked materials. Regarding functionalities, we report formerly impossible glass-like transparency, and excellent gas barrier considerably exceeding earlier nacre-mimetics based on natural nanoclay. Our study enables rational design of future high-performance nacre-mimetic materials and opens avenues for ecofriendly, transparent, self-standing and strong advanced barrier materials.

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Liquid crystalline inorganic nanosheets for facile synthesis of polymer hydrogels with anisotropies in structure, optical property, swelling/deswelling, and ion transport/fixation

Abstract: Macroscopically anisotropic hydrogels were synthesized by hybridization of poly(N-isopropylacrylamide) with liquid crystalline inorganic nanosheets; their anisotropies in the structure and properties are demonstrated.

Cited by 72 publications

References 51 publications

Development of 2-D Boron Nitride Nanosheets UV Photoconductive Detectors

Development of 2-D Boron Nitride Nanosheets UV Photoconductive Detectors

Bioinspired Nanocomposite Hydrogels with Highly Ordered Structures

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

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