The preparation and electrorheological behavior of bowl-like titanium oxide nanoparticles

He, Kai; Wen, Qingkun; Wang, Chengwei; Wang, Baoxiang; Yu, Shoushan; Hao, Chuncheng; Chen, Kezheng

doi:10.1039/c7sm01157a

Cited by 34 publications

(23 citation statements)

References 60 publications

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“…Generally, interfacial polarization is mostly responsible for the formation of the internal structures in the ER suspensions. For a strong ER effect, ER fluids should require dielectric relaxation peak in ɛ″ between 100 and 10 5 Hz, and then have a large Δɛ′ (Δɛ′ = ɛ′ 100 Hz – ɛ′ 100 kHz ) . To gain more insight into the relationship of ER behavior with dielectric property, the permittivity (ɛ′) and dielectric loss factor (ɛ″) were investigated by broadband dielectric spectroscopy (Figure ) for PANI‐1mLPPy and PANI‐2mLPPy copolymers based ER fluid, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Qin

Wen

et al. 2018

J of Applied Polymer Sci

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Hierarchical polyaniline/polypyrrole (PANI/PPy) copolymer nanofiber was prepared via a two-step method and adopted as dispersing materials for electrorheological (ER) fluids. The first step was used to synthesize PANI nanofibers by a rapid mixing method. Subsequently, the PANI/PPy copolymer nanofibers with a rough surface were obtained using an in situ polymerization method continuously. The morphology of the resultant PANI/PPy copolymer nanofibers can be controlled by varying the amount of Py monomer in the secondary in situ polymerization method. The rough surface of PANI/PPy copolymer nanofibers were confirmed by scanning electron microscopy and transmission electron microscopy. The diameter of PANI/PPy nanofiber is within the range 100-200 nm. The obtained PANI/PPy copolymer particles all exhibit amorphous structure through X-ray diffraction measurement. We also demonstrated that the hierarchical PANI/PPy copolymer nanofibers exhibited characteristic ER behaviors, which were investigated using a Haake rotational rheometer at various electric field strengths. The ER efficiency e for PANI-1mLPPy and PANI-2mLPPy ER fluids at shear rate 0.1 s 21 is 36.6 and 28.5 under electric field strength E 5 3 kV/mm, respectively. Low leaking current density is observed even at high electric field strength and wide plateau region appeared, which show a strong ER activity for the PANI/PPy composite nanofibers. The results also indicate that the PANI/PPy composite particles have distinctly enhanced ER effect compared with the pure PANI and PPy particles under electric stimuli. The significantly improved ER property of PANI/PPy-based ER fluid is ascribed to the enhanced interfacial polarization.

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Section: Resultsmentioning

confidence: 99%

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Qin

Wen

et al. 2018

J of Applied Polymer Sci

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“…Because of the unique advantages as discussed above, TiO 2 bowl-like nanomaterials also attract much interest from researchers. Chen et al reported a template-free method to produce bowl-like TiO 2 , [30] which is a typical solvothermal method with the following procedure: a proper amount of tetrabutyl titanate is dropped into a mixture of ethanol and isopropanol. Then, it is heated in a Teflon-lined stainless-steel autoclave for 6 h at 180 °C.…”

Section: Synthetic Strategies Of Bowl-like Nanostructuresmentioning

confidence: 99%

Complex Hollow Bowl‐Like Nanostructures: Synthesis, Application, and Perspective

Liang

Kou

Ding

2020

Adv Funct Materials

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Contourable design and synthesis in nanomaterial morphology are among the most attractive fields in material science. Among the various nanomaterials, hollow bowl‐like nanomaterials have shown promising potential and achieved great success in many different domains, such as lithium‐ion batteries, supercapacitors, and electro‐ and photochemical catalysts. The unique physicochemical properties of hollow bowl‐like nanomaterials have attracted enormous interest from scientists worldwide. Here, recent researches into bowl‐like nanomaterials, including: (i) synthesis methods, such as the no‐template, no‐patchy template, and patchy template methods; (ii) applications in lithium/sodium/potassium ion‐based batteries, microwave absorption, water‐splitting reactions, and so on are reviewed; and (iii) the problems and challenges are also discussed.

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“…The researchers have made extensive studies on the electrorheological performance of titanium dioxide. [ 5,17,18 ] However, in the actual test process, we found that the ER performance of titanium oxide is not ideal and its density is high comparing with silicone oil. Therefore, many researchers began to prepare titanium oxide with different morphologies to improve its ER performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrorheological Properties of Peanut‐Like Hollow Core–Shell Structure TiO₂@SiO₂ Nanoparticles

et al. 2021

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Although titanium oxide has a high dielectric constant, ordinary titanium oxides are not a good electrorheological (ER) fluid material. Herein, hollow peanut-like titanium oxide spheres are synthesized by hydrothermal method, and then coated with silicon oxide to form core-shell hollow TiO 2 @SiO 2 spheres. The structure is characterized by different methods, and the TiO 2 @SiO 2 composite particles are dispersed in silicone oil to prepare an ER suspension. The ER effect of 10% TiO 2 @SiO 2 -based ER fluid under different electric field strengths is tested, and its performance is analyzed. The results show that the coated particles significantly enhance the current meter performance. The shear stress value exceeds 200 Pa at an electric field strength of 3.0 kV mm À1 . The shear stress, shear viscosity, switching effect, and dielectric behavior of the base ER fluid are studied. And, the cause of this strong ER effect is studied. In the end, it is found that TiO 2 @SiO 2 peanut-shaped composite core-shell particles have a good ER effect and which is a kind of ER candidate material with simple preparation and development prospect.

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The preparation and electrorheological behavior of bowl-like titanium oxide nanoparticles

Cited by 34 publications

References 60 publications

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Complex Hollow Bowl‐Like Nanostructures: Synthesis, Application, and Perspective

Preparation and Electrorheological Properties of Peanut‐Like Hollow Core–Shell Structure TiO₂@SiO₂ Nanoparticles

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The preparation and electrorheological behavior of bowl-like titanium oxide nanoparticles

Cited by 34 publications

References 60 publications

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Facile fabrication of polyaniline/polypyrrole copolymer nanofibers with a rough surface and their electrorheological activities

Complex Hollow Bowl‐Like Nanostructures: Synthesis, Application, and Perspective

Preparation and Electrorheological Properties of Peanut‐Like Hollow Core–Shell Structure TiO2@SiO2 Nanoparticles

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Preparation and Electrorheological Properties of Peanut‐Like Hollow Core–Shell Structure TiO₂@SiO₂ Nanoparticles