HIGH PERFORMANCE CALCIUM TITANATE NANOPARTICLE ER FLUIDS

A type of calcium titanate (CTO) nanoparticles was synthesized by means of wet chemical method [1] without coating on the particles. The CTO/silicone oil ER fluid exhibits excellent electrorheological properties: high shear stress (~50-100 kPa ) under dc electric field, a low current density (less than 2μA/cm2 at 5kV/mm), and long term stability against sedimentation. Although there are not special additives in the ER fluids, it is found from the chemical analysis that a trace of alkyl group, hydroxyl group, carbonyl group and some ions is remained in the particles which may dominate the ER response.

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LANTHANUM TITANATE NANOPARTICLES ER FLUIDS WITH HIGH PERFORMANCE

Modern Physics Letters B ◽

10.1142/s0217984912500790 ◽

2012 ◽

Vol 26 (13) ◽

pp. 1250079 ◽

Cited By ~ 1

Author(s):

DE WANG ◽

RONG SHEN ◽

SHIQIANG WEI ◽

KUNQUAN LU

Keyword(s):

Yield Stress ◽

Silicone Oil ◽

Heating Temperature ◽

Hydroxyl Group ◽

Lanthanum Titanate ◽

Different Temperatures ◽

Static Yield ◽

Er Fluids ◽

Er Fluid ◽

Static Yield Stress

A new type of electrorheological (ER) fluid consisting of lanthanum titanate (LTO) nanoparticles is developed. The ER fluids were prepared by suspending LTO powder in silicone oil and the particles were fabricated by wet chemical method. This ER fluid shows excellent ER properties: The static yield stress reaches over 150 kPa under 5 kV/mm with linear dependence on the applied DC electric field, and the current density is below 10 μA/cm2. In order to investigate the affect factor on the ER behavior, the LTO powder were heated under different temperatures. The ER performances of two particles treated under different temperatures were compared and the composition changes for those particles were analyzed with TG-FTIR technique. It was found that the static yield stress of the suspensions fell from over 150 kPa to about 40 kPa and the current densities decreased prominently as the rise of the heating temperature. TG-FTIR analysis indicated that polar groups remained in the particles such as alkyl group, hydroxyl group and carbonyl group etc., contribute to the ER effect significantly. The experimental results are helpful to understand the mechanism of the high ER effect and to synthesize better ER materials.

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EFFECT OF RARE EARTH SUBSTITUTION ON ELECTRORHEOLOGICAL PROPERTIES OF TiO2

International Journal of Modern Physics B ◽

10.1142/s0217979202012384 ◽

2002 ◽

Vol 16 (17n18) ◽

pp. 2371-2377 ◽

Cited By ~ 15

Author(s):

X. P. ZHAO ◽

J. B. YIN ◽

L. Q. XIANG ◽

Q. ZHAO

Keyword(s):

Shear Stress ◽

Rare Earth ◽

Silicone Oil ◽

Anatase Phase ◽

New Class ◽

Dc Electric Field ◽

Er Fluids ◽

Er Fluid ◽

Electrorheological Properties ◽

Rare Earth Substitution

This paper describes a new class of water-free electrorheological (ER) fluids based on nonaqueous doped TiO 2 with rare earth (RE) in silicone oil. The thermal character and crystal structure of these materials are investigated with DSC, TG and XRD. The doped TiO 2 crystals possess anatase phase and their lattice spacing varies significantly with the content of rare earth. The rheological measurements show that the doped TiO 2 ER fluid exhibits an obviously higher shear stress than that of pure TiO 2 ER fluid under dc electric field. Especially, substitution with 10mol% cerium or 8mol% lanthanum for Ti can obtain a relatively high shear stress. On the basis of dielectric and conduction measurements, we preliminarily discuss the influence of the doping of rare earth on ER effects of TiO 2.

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Ultrathin Ir nanowires as high-performance electrocatalysts for efficient water splitting in acidic media

Nanoscale ◽

10.1039/c7nr09377b ◽

2018 ◽

Vol 10 (4) ◽

pp. 1892-1897 ◽

Cited By ~ 56

Author(s):

Luhong Fu ◽

Fulin Yang ◽

Gongzhen Cheng ◽

Wei Luo

Keyword(s):

Water Splitting ◽

High Performance ◽

Acidic Media ◽

Term Stability ◽

Long Term Stability ◽

Overall Water Splitting ◽

Chemical Approach ◽

Wet Chemical ◽

Attachment Mechanism

Ultrathin Ir wavy nanowires with a diameter of 1.7 nm are prepared by a simple wet-chemical approach through a nanoparticle attachment mechanism, and further used as electrocatalysts due to their superior activity and long-term stability toward overall water splitting in acidic media.

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Using MoS2/Fe3O4 as Ion-Electron Transduction Layer to Manufacture All-Solid-State Ion-Selective Electrode for Determination of Serum Potassium

Chemosensors ◽

10.3390/chemosensors9070155 ◽

2021 ◽

Vol 9 (7) ◽

pp. 155

Author(s):

Yan Su ◽

Ting Liu ◽

Caiqiao Song ◽

Aiqiao Fan ◽

Nan Zhu ◽

...

Keyword(s):

High Performance ◽

Accurate Determination ◽

Water Layer ◽

Ion Selective Electrode ◽

Potential Response ◽

Selective Electrode ◽

Response Measurement ◽

Long Term Stability

As an essential electrolyte for the human body, the potassium ion (K+) plays many physiological roles in living cells, so the rapid and accurate determination of serum K+ is of great significance. In this work, we developed a solid-contact ion-selective electrode (SC-ISE) using MoS2/Fe3O4 composites as the ion-to-electron transducer to determine serum K+. The potential response measurement of MoS2/Fe3O4/K+-ISE shows a Nernst response by a slope of 55.2 ± 0.1 mV/decade and a low detection limit of 6.3 × 10−6 M. The proposed electrode exhibits outstanding resistance to the interference of O2, CO2, light, and water layer formation. Remarkably, it also presents a high performance in potential reproducibility and long-term stability.

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High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽

10.1039/c4nr00277f ◽

2014 ◽

Vol 6 (12) ◽

pp. 6521-6525 ◽

Cited By ~ 7

Author(s):

Ming Zhuo ◽

Yuejiao Chen ◽

Tao Fu ◽

Haonan Zhang ◽

Zhi Xu ◽

...

Keyword(s):

High Performance ◽

Humidity Sensor ◽

High Sensitivity ◽

Fast Response ◽

Humidity Sensors ◽

Term Stability ◽

Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

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High-performance hole conductor-free perovskite solar cell using a carbon nanotube counter electrode

RSC Advances ◽

10.1039/d0ra05975g ◽

2020 ◽

Vol 10 (59) ◽

pp. 35831-35839 ◽

Cited By ~ 4

Author(s):

Mustafa K. A. Mohammed

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Carbon Nanotube ◽

High Performance ◽

Counter Electrode ◽

Perovskite Solar Cells ◽

Perovskite Solar Cell ◽

Manufacturing Cost ◽

Long Term Stability

Carbon-based perovskite solar cells (C-PSCs) are the most promising photovoltaic (PV) due to their low material and manufacturing cost and superior long-term stability.

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Bioinspired nano-ordered liquid membrane for precise molecular separation

10.21203/rs.3.rs-87445/v1 ◽

2020 ◽

Author(s):

Haozhen Dou ◽

Mi Xu ◽

Baoyu Wang ◽

Zhen Zhang ◽

Guobin Wen ◽

...

Keyword(s):

Self Assembly ◽

High Performance ◽

Liquid Membrane ◽

Three Dimensional ◽

Cellular Membrane ◽

Liquid Structure ◽

Long Term Stability ◽

Separation Membranes ◽

Molecular Separation

Abstract Cellular membranes provide ideal archetypes for molecule or ion separations with sub-angstrom scale precision, which are featured with both extremely high permeability and selectivity due to the well-defined membrane protein channels. However, the development of bioinspired membranes with artificial channels for sub-angstrom scale ethylene/ethane (0.416 nm / 0.443 nm) separation remains an uncharted territory and a significant challenge. Herein, a bioinspired nano-ordered liquid membrane is constructed by a facile ion/molecule self-assembly strategy for highly efficient ethylene/ethane separation, which mimics the structure of cellular membrane elegantly and possesses plenty of three-dimensional (3D) nanochannels. The elaborate regulation of non-covalent interactions by optimizing the ion/molecule compositions within membrane confers the nano-ordered liquid structure with interpenetrating and bi-continuous apolar domains and polar domains, which results in the formation of regular carrier wires and enormous 3D interconnected ethylene transport nanochannels. By virtue of these 3D nanochannels, the bioinspired nano-ordered liquid membrane manifests simultaneously super-high selectivity, excellent permeance and long-term stability, which exceeds previously reported ethylene/ethane separation membranes. This methodology in this work for construction of bioinspired membrane with tunable 3D nanochannels through ion/molecule self-assembly will enlighten the design and development of high-performance separation membranes for angstrom/sub-angstrom scale ion or molecule separations.

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Iodine-Loaded Calcium Titanate for Bone Repair with Sustainable Antibacterial Activity Prepared by Solution and Heat Treatment

Nanomaterials ◽

10.3390/nano11092199 ◽

2021 ◽

Vol 11 (9) ◽

pp. 2199

Author(s):

Seiji Yamaguchi ◽

Phuc Thi Minh Le ◽

Seine A. Shintani ◽

Hiroaki Takadama ◽

Morihiro Ito ◽

...

Keyword(s):

Heat Treatment ◽

Antibacterial Activity ◽

Bone Repair ◽

Reduction Rate ◽

Calcium Titanate ◽

Apatite Formation ◽

Oh Groups ◽

Long Term Stability ◽

Combined Solution

In the orthopedic and dental fields, simultaneously conferring titanium (Ti) and its alloy implants with antibacterial and bone-bonding capabilities is an outstanding challenge. In the present study, we developed a novel combined solution and heat treatment that controllably incorporates 0.7% to 10.5% of iodine into Ti and its alloys by ion exchange with calcium ions in a bioactive calcium titanate. The treated metals formed iodine-containing calcium-deficient calcium titanate with abundant Ti-OH groups on their surfaces. High-resolution XPS analysis revealed that the incorporated iodine ions were mainly positively charged. The surface treatment also induced a shift in the isoelectric point toward a higher pH, which indicated a prevalence of basic surface functionalities. The Ti loaded with 8.6% iodine slowly released 5.6 ppm of iodine over 90 days and exhibited strong antibacterial activity (reduction rate >99%) against methicillin-resistant Staphylococcus aureus (MRSA), S. aureus, Escherichia coli, and S. epidermidis. A long-term stability test of the antibacterial activity on MRSA showed that the treated Ti maintained a >99% reduction until 3 months, and then it gradually decreased after 6 months (to a 97.3% reduction). There was no cytotoxicity in MC3T3-E1 or L929 cells, whereas apatite formed on the treated metal in a simulated body fluid within 3 days. It is expected that the iodine-carrying Ti and its alloys will be particularly useful for orthopedic and dental implants since they reliably bond to bone and prevent infection owing to their apatite formation, cytocompatibility, and sustainable antibacterial activity.

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