Weina He

Shanghai Jiao Tong University

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Xuetong Zhang

East China University of Technology

Junting Xu

Zhejiang University

Zhiqiang Fan

Zhejiang University

Jin Wang

University of Science and Technology of China

Guangyong Li

Liaocheng University

Binyang Du

Zhejiang University

Wenhui Wang

Chinese Academy of Sciences

Rui Sun

Guizhou University

Xuehua Liu

Northwest University

Xiaochun Zhou

Suzhou Institute of Nano-tech and Nano-bionics

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Chinese Academy of Sciences

Suzhou Institute of Nano-tech and Nano-bionics

University of Chinese Academy of Sciences

University of Science and Technology of China

Beijing Institute of Technology

Shanghai Advanced Research Institute

Zhejiang University

Shanghai Jiao Tong University

Suzhou Research Institute

Shanghai University

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Effect of pH on the Micellar Morphology of Semicrystalline PCL-b -PEO Block Copolymers in Aqueous Solution

Macromolecular Chemistry and Physics (2012)

Weina He Junting Xu Binyang Du Zhiqiang Fan Fangli Sun

The effect of pH on the micellar morphology of a semicrystalline poly(ϵ-caprolactone)-block-poly(ethylene oxide) block copolymer (PCL66-b-PEO44) in aqueous solution is investigated. Spherical micelles are formed in neutral and acidic solutions. However, addition of alkali to the neutral micellar solution triggers a sphere-to-cylinder transformation of the micellar morphology. The micelles are stable in both neutral and acidic solutions, but the size of the micelles becomes gradually larger in the alkali solution. This phenomenon is interpreted in terms of the effect of pH value on the reduced tethering density of the corona in the semicrystalline micelles.

Morphology

10.1002/macp.201100615

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Citations (45)

Elastic, Conductive, Polymeric Hydrogels and Sponges

Scientific Reports (2014)

Yun Lu Weina He T.Q. Cao Haitao Guo Yongyi Zhang

As a result of inherent rigidity of the conjugated macromolecular chains resulted from the delocalized π-electron system along the polymer backbone, it has been a huge challenge to make conducting polymer hydrogels elastic by far. Herein elastic and conductive polypyrrole hydrogels with only conducting polymer as the continuous phase have been simply synthesized in the indispensable conditions of 1) mixed solvent, 2) deficient oxidant, and 3) monthly secondary growth. The elastic mechanism and oxidative polymerization mechanism on the resulting PPy hydrogels have been discussed. The resulting hydrogels show some novel properties, e.g., shape memory elasticity, fast functionalization with various guest objects, and fast removal of organic infectants from aqueous solutions, all of which cannot be observed from traditional non-elastic conducting polymer counterparts. What's more, light-weight, elastic, and conductive organic sponges with excellent stress-sensing behavior have been successfully achieved via using the resulting polypyrrole hydrogels as precursors.

Polypyrrole

Rigidity (electromagnetism)

Elasticity

10.1038/srep05792

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Citations (164)

Two Growth Modes of Semicrystalline Cylindrical Poly(ε-caprolactone)-b-poly(ethylene oxide) Micelles

Macromolecules (2012)

Weina He Bing Zhou Junting Xu Binyang Du Zhiqiang Fan

The micelles of a poly(ε-caprolactone)-b-poly(ethylene oxide) block copolymer (PCL59-b-PEO113) in different mixed solvents were held at 53 °C for 5 min, and seed solutions with different micellar morphologies and amounts of micellar semicrystalline seeds were prepared. The crystallinity of these seed micelles was identified by high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). It is found that mostly amorphous spherical micelles are formed by heating micellar solutions in H2O/THF (5/1 v/v) and H2O/dioxane (5/1 v/v) mixed solvents, a mixture of amorphous spherical micelles and short semicrystalline cylindrical micelles is yielded in H2O/DMF (5/1 v/v), whereas mostly short semicrystalline cylindrical micelles are obtained in H2O/DMSO (5/1 v/v) mixed solvent. The seed solutions were placed at 4 °C for micellar growth. Transmission electron microscope (TEM) shows that micellar growth driven by epitaxial crystallization of core-forming PCL chains takes place and the length of grown cylindrical micelles increases with time. Two growth modes are observed. One is the growth of unimers (or amorphous spherical micelles) on the active ends of semicrystalline cylindrical micelles in micellar solution in H2O/DMF (5/1 v/v) at the initial growth period. The other is the growth by end-to-end coupling of cylindrical micelles in H2O/DMSO (5/1 v/v). The kinetics of micellar growth is strongly dependent on the growth mechanism. The growth of the cylindrical micelles in the H2O/DMF (5/1 v/v) solution is much faster than that in the H2O/DMSO (5/1 v/v) solution. On long time scale, micellar growth by end-to-end coupling of semicrystalline cylindrical micelles occurs with slow rate in both H2O/DMF (5/1 v/v) and H2O/DMSO (5/1 v/v) solutions, and the growth rate in H2O/DMF (5/1 v/v) solution is even slower than that in H2O/DMSO (5/1 v/v).

Caprolactone

Selected area diffraction

10.1021/ma301267k

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Citations (112)

Polypyrrole/Silver Coaxial Nanowire Aero-Sponges for Temperature-Independent Stress Sensing and Stress-Triggered Joule Heating

ACS Nano (2015)

Weina He Guangyong Li Shangquan Zhang Yong Wei Jin Wang

To obtain ideal sensing materials with nearly zero temperature coefficient resistance (TCR) for self-temperature-compensated pressure sensors, we proposed an Incipient Network Conformal Growth (INCG) technology to prepare hybrid and elastic porous materials: the nanoparticles (NPs) are first dispersed in solvent to form an incipient network, another component is then introduced to coat the incipient network conformally via wet chemical route. The conformal coatings not only endow NPs with high stability but also offer them additional structural elasticity, meeting requirements for future generations of portable, compressive and flexible devices. The resultant polypyrrole/silver coaxial nanowire hybrid aero-sponges prepared via INCG technology have been processed into a piezoresistive sensor with highly sensing stability (low TCR 0.86 × 10–3/°C), sensitivity (0.33 kPa–1), short response time (1 ms), minimum detectable pressure (4.93 Pa) after suffering repeated stimuli, temperature change and electric heating. Moreover, a stress-triggered Joule heater can be also fabricated mainly by the PPy-Ag NW hybrid aero-sponges with nearly zero temperature coefficient.

Coaxial

Polypyrrole

Piezoresistive effect

Temperature coefficient

Heating element

10.1021/acsnano.5b00626

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Citations (188)

[Spectra characteristics of an aminated glucose and its complex with Cu(II)].

PubMed (2008)

Qiangqiang Liao Yijiu Li Bo Xiang Rumei Cheng Lin Chen

Characteristics of an aminated glucose and its complex with Cu (II) were investigated by FTIR, 1H-NMR and UV spectroscopy, respectively. Compared with glucose, the FTIR spectrum of an aminated glucose showed a moderate peak at 1 629-1 608 cm(-1) which was attributed to deltaNH vibration, suggesting that glucose reacted with ethylenediamine. The 1H-NMR spectrum of an aminated glucose demonstrated the signal of the C1 hydroxy proton and one of the amino proton at 4. 82-4. 79 ppm, illustrating that the amino of ethylenediamine was substituted for the hydroxy group of C1. As for UV spectra, an aminated glucose did not show absorbance in the ultraviolet region while its complex with Cu(II) had obvious absorption peak at about 236 nm. The complex ratio of the aminated glucose to Cu(II) was about 1 to 1 and the stability constant of its Cu(II) complex was 6.8 x 10(7) L x mol(-1).

Ethylene diamine

Absorbance

Proton NMR

D-Glucose

Source

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Reduced-graphene-oxide/metal-oxide p-n heterojunction aerogels as efficient 3D sensing frameworks for phenol detection

Carbon (2015)

Dongman Guo Peijie Cai Jie Sun Weina He Xiaohan Wu

Thermal Stability

Specific surface area

Tin oxide

10.1016/j.carbon.2015.12.074

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Citations (98)

Controlled Assembly of Graphene-Based Aerogels

Acta Physico-Chimica Sinica (2016)

Guangyong Li Xiao-Han WU Weina He Jianhui Fang Xue-Tong ZHANG

Abstract:

10.3866/pku.whxb201605243

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Citations (4)

CCDC 786866: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Yafeng Li Leilei Wu Jin-Xu Sun Weina He Chao Wang

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccvdsss

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Crystallization assisted self-assembly of semicrystalline block copolymers

Progress in Polymer Science (2012)

Weina He Junting Xu

10.1016/j.progpolymsci.2012.05.002

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Citations (354)

Self-crosslinked polyaniline hydrogel electrodes for electrochemical energy storage

Carbon (2015)

Haitao Guo Weina He Yun Lu Xuetong Zhang

Ammonium persulfate

10.1016/j.carbon.2015.03.062

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Citations (161)