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1. chinaXiv:201705.00586 [pdf]

Aggregation-induced emission of tetraphenylethylene-modified polyethyleneimine for highly selective CO2 detection

Lu, W [Lu, Wei][ 1,2 ]; Xiao, P [Xiao, Peng][ 1 ]; Gu, JC [Gu, Jincui][ 1 ]; Zhang, JW [Zhang, Jiawei][ 1 ]; Huang, YJ [Huang, Youju][ 1 ]; Huang, Q [Huang, Qing][ 1 ]; Chen, T [Chen, Tao][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

A polymer-based visible and quantitative fluorometric assay for CO2 gas is constructed using branched polyethyleneimine (PEI) covalently modified with tetraphenylethylene (TPE). The sensing mechanism relies on the reaction of CO2 with alkylamines of PEI to induce the “solution-to-precipitation” phase transi- tion of the sensory polymer (TPE–PEI), thus resulting in strong aggregation-induced fluorescent emission of TPE–PEI. It works in a relatively environmental benign ethanol medium and avoids the use of toxic amine compounds with unpleasant odor. More importantly, this system is proved to be highly tolerant to possibly coexisting water, carbon monoxide, acid SO2 and H2 S gases as well as many common volatile organic compounds. These characteristics make the presently developed fluorescent chemosensor hold great potential for many real-world applications.

submitted time 2017-05-02 Hits1591Downloads965 Comment 0

2. chinaXiv:201705.00516 [pdf]

Mechanical Robust and Self-Healable Supramolecular Hydrogel

Zheng, J [Zheng, Jing][ 1 ]; Xiao, P [Xiao, Peng][ 1 ]; Liu, W [Liu, Wei][ 1 ]; Zhang, JW [Zhang, Jiawei][ 1 ]; Huang, YJ [Huang, Youju][ 1 ]; Chen, T [Chen, Tao][ 1 ]

Development of self-healing polymers with spontaneous self-healing capability and good mechanical performance is highly desired and remains a great challenge. Here, mechanical robust and self-healable supramolecular hydrogels have been fabricated by using

submitted time 2017-05-02 Hits1403Downloads797 Comment 0

3. chinaXiv:201705.00479 [pdf]

Highly Efficient Actuator of Graphene/Polydopamine Uniform Composite Thin Film Driven by Moisture Gradients

He, J [He, Jiang][ 1,2 ]; Xiao, P [Xiao, Peng][ 1 ]; Zhang, JW [Zhang, Jiawei][ 1 ]; Liu, ZZ [Liu, Zhenzhong][ 1 ]; Wang, WQ [Wang, Wenqin][ 2 ]; Qu, LT [Qu, Liangti][ 3 ]; Ouyang, Q [Ouyang, Qing][ 1,4 ]; Wang, XF [Wang, Xuefei][ 1,4 ]; Chen, YS [Chen, Yousi][ 1,4 ]; Chen, T [Chen, Tao][ 1 ]

This study demonstrates that uniform materials of reduced graphene oxide/polydopamine composite thin film can serve as a highly sensitive and ultrafast responsive actuator driven by water gradients absorption-induced in situ formation of bilayer structures in swelling difference along the lateral uniform thin film

submitted time 2017-05-02 Hits1179Downloads819 Comment 0

4. chinaXiv:201705.00456 [pdf]

Spatially-controlled growth of platinum on gold nanorods with tailoring plasmonic and catalytic properties

Rong, Yun; Dandapat, Anirban; Huang, Youju; Sasson, Yoel; Zhang, Lei; Dai, Liwei; Zhang, Jiawei; Guo, Zhiyong; Chen, Tao
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

We describe the synthesis of bimetallic dendritic platinum decorated gold nanorods (AuNRs) by the spatial control of Pt growth over gold nanorods using a heterogeneous seed-mediated growth method. The amounts of the Au seed and Pt-precursor were changed to achieve a tunable volume fraction of Pt coverage on the Au NRs surface. Pt nanostructures were spatially separated from each other, which was highly favorable for promising optical and catalytic properties. The dendritic-Pt decorated AuNRs with variable Au/Pt ratios were exploited to study their surface plasmonic properties and catalytic activities. Interestingly, the Pt decorated AuNRs showed strong surface plasmon resonance (SPR) peak due to noncompact dendritic Pt shell in contrast to the conventional core–shell Au@Pt nanoparticles (NPs). Moreover, the longitudinal peak of the AuNRs was finely tuned from 820 to 950 nm (NIR region) by controlling the volume fraction of the Pt decoration over the AuNRs. The catalytic activity of the dendritic-Pt decorated AuNRs on the reduction of 4-nitrophenol (4-NP) by sodium borohydride (NaBH4) as reducing agent was studied and found to be superior to the activities compared to the monometallic Au NRs. Considering practical applications, dendritic-Pt decorated AuNRs nanostructures were immobilized successfully on the hydrophilic polyvinylidene difluoride (PVDF) film as an efficient reusable catalyst.

submitted time 2017-05-02 Hits1319Downloads740 Comment 0

5. chinaXiv:201705.00447 [pdf]

pH- and Sugar-Induced Shape Memory Hydrogel Based on Reversible Phenylboronic Acid-Diol Ester Bonds

Meng, H [Meng, Hao][ 1,2 ]; Zheng, J [Zheng, Jing][ 2 ]; Wen, XF [Wen, Xiufang][ 1 ]; Cai, ZQ [Cai, Zhiqi][ 3 ]; Zhang, JW [Zhang, Jiawei][ 2 ]; Chen, T [Chen, Tao][ 2 ]

A simple strategy is provided to construct a novel pH- and sugar-induced shape memory hydrogel based on dynamic phenylboronic acid [PBA]-diol interactions formed by PBA-modified sodium alginate [Alg-PBA] and poly[vinyl alcohol] [PVA]. The dynamic PBA-diol

submitted time 2017-05-02 Hits966Downloads622 Comment 0

6. chinaXiv:201705.00327 [pdf]

Controlled evaporative self-assembly of Fe3O4 nanoparticles assisted by an external magnetic field

Men, YH [Men, Yonghong][ 1,2 ]; Wang, WQ [Wang, Wenqin][ 1 ]; Xiao, P [Xiao, Peng][ 2 ]; Gu, JC [Gu, Jincui][ 2 ]; Sun, AH [Sun, Aihua][ 2 ]; Huang, YJ [Huang, Youju][ 2 ]; Zhang, JW [Zhang, Jiawei][ 2 ]; Chen, T [Chen, Tao][ 2 ]

High fidelity and regularity structures of nanoscale materials has opened up new opportunities for developing miniaturized devices. A simple yet robust approach of magnetic field assisted controlled evaporative self-assembly [CESA] is developed to achieve

submitted time 2017-05-02 Hits981Downloads595 Comment 0

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