Enhanced Electroresponse of Alkaline Earth Metal-Doped Silica/Titania Spheres by Synergetic Effect of Dispersion Stability and Dielectric Property

Yoon, Chang‐Min; Lee, Seungae; Cheong, Oug Jae; Jang, Jyongsik

doi:10.1021/acsami.5b02388

Cited by 34 publications

(27 citation statements)

References 53 publications

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“…Only one broad peak was detected for all materials between 20 and 30 , indicating the amorphous phase of sol-gel fabricated SiO 2 , TiO 2 , and its composite. 33,54 These results conrmed that the HST rod was successfully fabricated as a 1D, hollow, metal oxide composite material.…”

Section: Fabrication Of Hst Rod Materialsmentioning

confidence: 79%

“…[44][45][46] Among various characteristics, the most important factors for ER materials are dispersion stability (or anti-sedimentation property) and the dielectric property, which directly affects the ER activity. 33 Thus, ER materials with a low particle mass and density are necessary to enhance dispersion stability. As 62 Specically, the 1D rod-like material was able to exert excellent mechanical strength owing to the compact overlapping of materials.…”

Section: Electro-response Of Hst Rod-based Er Uidmentioning

confidence: 99%

“…hollow SiO 2 /TiO 2 , TiO 2 , alkaline earth metal-doped SiO 2 /TiO 2 ). [33][34][35] However, none of previous studies including our group have reported the fabrication of hollow metal oxide-composited rod-like nanomaterial with tunable L/D. Accordingly, the objective of this study was to fabricate a material combining all of the advantages of a metal oxide, a 1D orientation, and high porosity by combining well-known simple (sol-gel, modied Stöber, and SMER) methods from other and our groups with some inventive modications according to our experimental condition.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

et al. 2017

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In this study, a 1D oriented hollow SiO 2 /TiO 2 (HST) rod-like material was successfully fabricated via a sequential combination of sol-gel use, TiO 2 incorporation, and a sonication-mediated etching and redeposition method. This carefully manipulated new material has numerous advantageous physical and intrinsic properties, such as increased surface area, pore volume, interfacial polarization, and dielectric properties introduced from each synthetic step. The synthesized HST rod was adopted as an electrorheological (ER) material for practical examination of these characteristics. The HST rod materials exhibited 1.5-and 3-fold higher ER performance than a non-metal SiO 2 rod and a non-hollow SiO 2 /TiO 2 core/shell (ST/CS) rod, which are interim synthetic steps. Moreover, the HST rod exhibited remarkable 6-fold increased ER efficiency relative to a sphere-shaped hollow SiO 2 /TiO 2 particle synthesized using a similar experimental method. These notable enhancements in ER performance are attributed to incorporation of the experimentally designed characteristics of the HST rod: 1D structure, metal oxide incorporation, and creation of a hollow cavity. For future study, we expect that these versatile HST rod materials can be applied in a range of fields including drug delivery, photo-catalysis, and as building blocks.SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (2) TEM micrographs HCl untreated and calcined SiO 2 rod and resulting HST rod, (3) TEM micrographs of shell thickness controlled HST rod, (4) TEM micrographs of SiO 2 rod, ST/CS rod, and HST materials with varying aspect ratio (L/D ¼ 1, 2, 6), (5) low-magnied TEM micrographs of various HST materials (L/D ¼ 1, 2, 6), (6) physical parameters of various HST materials, (7) porosity, pore volume, and BET surface area of HST rod (L/D ¼ 3), (8) EDS analysis of SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (9) STEM elemental mapping of SiO 2 rod (L/D ¼ 3), (10) FT-IR spectra and XRD pattern of SiO 2 rod, ST/CS rod, and HST rod (L/D ¼ 3), (11) FT-IR spectra of HCl treated and untreated SiO 2 rod, (12) atomic compositions of various HST materials (L/D ¼ 1, 2, 6), (13) shear stress of HST material-based ER uids with varying aspect ratio (L/D ¼ 1, 2, 6), (14) dielectric properties of HST sphere. See

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Section: Fabrication Of Hst Rod Materialsmentioning

confidence: 79%

Section: Electro-response Of Hst Rod-based Er Uidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

et al. 2017

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“…Additionally, Mg, which has rarely been used as a dopant in ER fluids, has been reported as a biodegradable, relatively safe, and nonhazardous metal [27,28] . A hollow nanoparticle (HNP)‐based ER fluid without metal doping shows good ER performance, and metal‐doping on HNP further enhances its performance [29] . Vegetable oils are biodegradable at 97–99 % according to the CEC‐L‐33 test, [14] and can be degraded at relatively low temperature compared to the conventional oils such as mineral oil and silicone oil [30,31] …”

Section: Introductionmentioning

confidence: 99%

Electroresponsive Performances of Ecoresorbable Smart Fluids Consisting of Various Plant‐Derived Carrier Liquids

Park

Gwon

Lee

2021

Chemistry A European J

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This paper proposes the fabrication of a new type of electrorheological (ER) fluid with ecoresorbable features as well as excellent electroresponsive performance. The proposed ER fluid consists of biocompatible Mg‐doped silica/titania hollow nanoparticles (ST HNPs) suspended in vegetable oils (canola, grapeseed, olive, and soy). The effects of biodegradable plant‐derived carrier liquids on the ER performance are analyzed. The polarizability and wettability of the fabricated ER fluids are studied. The high polarizability of the nanoparticles contributes to the highly electroresponsive performance by inducing electrostatic interactions between the nanoparticles under electric fields; this enables the formation of a rigid and strong fibril structure. A suitable wettability, which represents the favorable interaction between the oil and the nanoparticles, allows the nanoparticles to disperse evenly in the oil and prevents their aggregation, thereby making the formation of a rigid and strong fibrillar structure under the electric field easier.

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“…Some compounds are attracting attention, such as titanium oxide with different morphologies, and calcium and strontium titanates, because of their high dielectric polarizability. The yield stress of these kinds of inorganic-based ER fluids can be over 130 kPa or higher when modified by polar molecules [35,36,37,38]. The high yield stress is actually enough for applications, however, inorganics always result in serious abrasion to devices and have poor suspension stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrorheological Response of Cellulose: A Double Effect of Modification by Urea-Terminated Silane

et al. 2018

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Abstract:As a natural polymer with abundant sources, cellulose was one of the earliest applied electrorheological (ER) materials. However, cellulose-based ER materials have not attracted much attention because of their relatively low ER effect and sensitivity to water. In this study, cellulose rods were decorated with a urea-terminated silane, 1-(3-(trimethoxysilyl) propyl) urea, after being swelled in sodium hydroxide solution. The morphologies and structures of the cellulose particles were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy and X-ray diffraction, confirming the dramatic differences of the treated cellulose particles from the pristine cellulose. Rheological behaviors of the pristine and modified cellulose particles in silicone oil were observed using a rotational rheometer. It was found that the silane-modified cellulose showed higher ER effect and higher dielectric properties than the pristine cellulose particles, which was not only related to the grafted polar molecules but may also be associated with the porous morphologies of the treated cellulose particles.

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Enhanced Electroresponse of Alkaline Earth Metal-Doped Silica/Titania Spheres by Synergetic Effect of Dispersion Stability and Dielectric Property

Cited by 34 publications

References 53 publications

Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

Fabrication of a silica/titania hollow nanorod and its electroresponsive activity

Electroresponsive Performances of Ecoresorbable Smart Fluids Consisting of Various Plant‐Derived Carrier Liquids

Enhanced Electrorheological Response of Cellulose: A Double Effect of Modification by Urea-Terminated Silane

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