Structure, electronic and mechanical properties of Ga 1−x B x P alloys

Zhao, Beijun; Zhang, Junqin; Ma, Huihui; Wei, Qun; Yang, Yintang

doi:10.1016/j.physb.2017.06.076

Cited by 17 publications

(28 citation statements)

References 49 publications

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“…O ‐quinone, the oxidation product of gallol, is well known to react with primary amine and thiol nucleophiles to yield cross‐linked gelatin macromolecular networks via Michael addition reaction as well as Schiff base . In addition, supramolecular interactions, that is, hydrogen bond and π–π stacking, also contribute to the cross‐linking of the hydrogel (Figure ). Oxidation of gallol is also achieved in alkaline environment and consequently leads to the formation of the hydrogel; details are gathered in the supporting information.…”

Section: Resultsmentioning

confidence: 99%

“…In our case, the cross‐linking of the hydrogel is accomplished via a combination of supramolecular bonds and covalent bonds, which endows the hydrogel with good recovery as well as mechanical strength. With the addition of NaIO 4 , the hydrogel is partly cross‐linked by covalent bonds, but there are considerable supramolecular interactions existing because the maximum amount of NaIO 4 was 0.3 molar rate . Thus, the enhanced strength along with the supramolecular interactions favor the increase of the SHR value of the hydrogel.…”

Section: Resultsmentioning

confidence: 99%

“…Here, the reconnected hydrogel is denoted as “after healing,” and the original hydrogel without cutting is denoted as “before healing.” Both hydrogel samples were immersed into 30% (NH 4 ) 2 SO 4 w/w for 24 h to improve their mechanical strength, thus the obtained samples will be strong enough to withstand the clamp of UTM . Tensile tests were subsequently conducted at a stretch rate of 20 mm s −1 , and the self‐healing rate (SHR, %) was calculated by the following equation:

S H R (%) = S_{after} ​ / ​ S_{before} \times 100 %

where S before is the tensile stress of “before healing” hydrogel at break, and S after is tensile stress of “after healing” hydrogel at break …”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

Zhao

Xiong

et al. 2018

Macro Chemistry & Physics

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Injectable self‐healing hydrogels have drawn growing attention for their extensive applications in biomedical fields. Hydrogels containing nanoparticles also exhibit promising potentials in catalysis, wastewater treatment, and organic synthesis. Inspired by the multifunction of gallol presented herein, a simple one‐pot method to produce a gallol‐tethered gelatin hydrogel via Schiff base under oxidizing conditions using various oxidants is presented. The hydrogels prepared by NaIO4‐induced cross‐linking present a high self‐healing rate (up to 84.5%), injectable ability, tunable mechanical property, flexible viscoelasticity, and macroporous structure owing to the combination of covalent cross‐linking and supramolecular interactions. HAuCl4 contributes to the 3D structure formation of the gelatin hydrogel via oxidation cross‐linking. It is reduced by the gallol groups to produce nanogold (AuNP)‐decorated hydrogel (Au‐gel). This Au‐gel is fully characterized by UV–vis, XRD, TEM, SEM, EDX, and ICP‐MS and exhibits a high‐catalytic activity for the reduction of 4‐nitrophenol. The solid Au‐gel catalyst is robust, easily recyclable, and reused at least eight times.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

S H R (%) = S_{after} ​ / ​ S_{before} \times 100 %

where S before is the tensile stress of “before healing” hydrogel at break, and S after is tensile stress of “after healing” hydrogel at break …”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

Zhao

Xiong

et al. 2018

Macro Chemistry & Physics

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“…In Figure S2 peaks at 309 and 580 nm, which are owed to the π-π* transition of the benzene ring and the π B -π Q transition of the benzenoid (B) to quinoid (Q) excitonic transition, respectively. [37,38] The doped SE has no change in the UV-vis spectra in Figure 2f. But the color of all SE-AT samples changes from blue to green, and two new absorption peaks at 426 and 798 nm appear.…”

Section: Self-healing Elastomersmentioning

confidence: 97%

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

Liu

Yan

Zhang

2018

Macromol. Rapid Commun.

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A new design strategy to produce a supramolecular elastomer with self‐healing and dielectric properties by synthesizing an aniline tetramer (AT)‐functionalized supramolecular elastomer (SE‐AT) is demonstrated. The termination of AT in the supramolecular system not only shortens linear amide molecular chain to decrease glass transition temperature but also destroys the crystallization to achieve amorphous structure. The SE‐AT provides two kinds of noncovalent bonding including π–π stacking and the hydrogen bond, which makes the material more easily healed. The SE‐AT20% can heal mechanical properties within 24 h at room temperature without any external stimulus. The dielectric constant shows a continuous increase overall with increasing AT content. The material exhibits good electro‐mechanical properties, which is attributed to a simultaneous increase in dielectric constant and decrease in modulus. The maximum actuated strain significantly increases with the increasing AT content and the SE‐AT20% reaches 10% at 1 V µm−1. Moreover, SE‐AT exhibits the ability to regain actuated strain on the location of the mechanical damage after self‐healing.

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“…Ma and co-workers recently reported a review 27 compiling the main studies on bioactive scaffolds for tissue regeneration that employ electrically conducting polymers, such as polyaniline (PAni) and oligomers, polypyrrole (PPy) and polythiophene (PTh) combined with poly(ethylene glycol) (PEG), 28,29 polylactide (PLA), 30 and polycaprolactone (PCL). 31 Although amphiphilic conducting polymers for biomedical functions have not been yet extensively addressed, systems derived from polypyrrole (PPy) and polythiophene (PTh) are among the most well studied. For example, pH responsive PTh-g-poly(N,N-dimethylaminoethylmethacrylate) (PTh-g-PDMA) was proposed as an aqueous sensor for biological applications, 32 an amphiphilic copolymer consisting of a PTh backbone and sparsely attached oligo-ε-caprolactone side chains (PTh-g-PCL) was proven effective as a dopamine biosensor, 33 and PPy-g-poly(styrenesulfonic acid) (PPy-g-PSSA) was used for the electrocatalytic biosensing of hypoxanthine.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic polypyrrole-poly(Schiff base) copolymers with poly(ethylene glycol) side chains: synthesis, properties and applications

et al. 2018

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New amphiphilic poly(ethylene glycol) (PEG)-grafted random intrinsically conducting copolymers which combine three different functionalities have been engineered, prepared and characterized. Specifically, these "rod-coil" type copolymers bear conducting polypyrrole (PPy) and poly(Schiff base) (PSB) sequences randomly distributed in their backbones; hydrophilic grafted side chains consisting of well-defined PEG chains are attached to the PSB units. Basically, the synthesis of the copolymers is conducted sequentially by employing the "macromonomer" technique via electrochemical co-polymerization of a bis ( pyrrole) benzoic Schiff base-containing PEG macromonomer with pyrrole monomers. After investigation of the chemical and electrochemical properties of the synthesized copolymers, their advantages of multi-functionality in terms of biomedical applications have been demonstrated. More specifically, the conjugated PPy and PSB sequences enabled the grafted copolymers to exhibit great ability to catalyse the oxidation of serotonin, an important neurotransmitter found in blood platelets and in the central nervous systems of animals and humans. On the other hand, the enhanced biocompatibility in comparison with bare PPy is due to the presence of PEG side chains, while bacteriostatic activity against both Gram-negative and Gram-positive bacteria is imparted by the synergistic combination of the polycationic character of the PPy main chain with the benzoic Schiff base functional groups and with the bent-shaped architecture of the facially amphiphilic PSB sequences, respectively. Accordingly, these grafted copolymers are promising materials for developing implantable electrodes for serotonin detection which present the abovementioned characteristics. c "Petru

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Structure, electronic and mechanical properties of Ga 1−x B x P alloys

Cited by 17 publications

References 49 publications

Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

A Self‐Healing Dielectric Supramolecular Elastomer Functionalized with Aniline Tetramer

Amphiphilic polypyrrole-poly(Schiff base) copolymers with poly(ethylene glycol) side chains: synthesis, properties and applications

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