Lattice relaxation of monosize CeO2−x nanocrystalline particles

Tsunekawa, Shin; Sahara, Ryoji; Kawazoe, Yoshiyuki; Ishikawa, Kenji

doi:10.1016/s0169-4332(99)00298-6

Cited by 131 publications

(94 citation statements)

References 8 publications

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“…Figure 4 shows the lattice constant of the ceria nanoparticles as a function of particle size. In the figure, the valence of Ce predicted by Tsunekawa et al [22] is also plotted. The lattice constant increases with decreasing the particle size.…”

Section: Synthesis and Size Characterizationmentioning

confidence: 99%

Electrical conductivity of ceria nanoparticles under high pressure

et al. 2008

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This paper describes the electrical conductivity of ceria nanoparticles under high pressure ranging from 2 to 6 GPa. The samples used were pure and acceptor-doped ceria nanoparticles with a grain size of approximately 2 nm prepared by mixing hexamethylenetramine and metal nitrate solutions. The size of ceria nanoparticles was controlled to be 2 to 15 nm by varying heat-treatment conditions. The in-situ electrical conductivity measurements under high pressure were conducted by using an ac-impedance spectroscopy. By applying a pressure of 6 GPa at 300 • C, the green compact of 6 mol % Sm-doped ceria nanoparticles was densified; a relative density of 93% was achieved. The sample showed an electrical conductivity of 3× 10 −3 S/cm at 300 • C under 6 GPa. The enhancement of electrical conductivity under high pressure seems to be related to ionic conduction in the vicinity of grain boundaries.

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Section: Synthesis and Size Characterizationmentioning

confidence: 99%

Electrical conductivity of ceria nanoparticles under high pressure

et al. 2008

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“…At the nanoscale, lattice strains promote the formation of defect sites and the preferential formation of the Ce 3 + oxidation state. [ 47,48 ] This preferential formation of the Ce 3 + state allows for the regeneration of the defect site via redox cycling reactions, [ 49 ] …”

Section: Full Papermentioning

confidence: 99%

Application of Nanoparticle Antioxidants to Enable Hyperstable Chloroplasts for Solar Energy Harvesting

Boghossian

Şen

Gibbons

et al. 2013

Advanced Energy Materials

106

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The chloroplast contains densely stacked arrays of light‐harvesting proteins that harness solar energy with theoretical maximum glucose conversion efficiencies approaching 12%. Few studies have explored isolated chloroplasts as a renewable, abundant, and low cost source for solar energy harvesting. One impediment is that photoactive proteins within the chloroplast become photodamaged due to reactive oxygen species (ROS) generation. In vivo, chloroplasts reduce photodegradation by applying a self‐repair cycle that dynamically replaces photodamaged components; outside the cell, ROS‐induced photodegradation contributes to limited chloroplast stability. The incorporation of chloroplasts into synthetic, light‐harvesting devices will require regenerative ROS scavenging mechanisms to prolong photoactivity. Herein, we study ROS generation within isolated chloroplasts extracted from Spinacia oleracea directly interfaced with nanoparticle antioxidants, including dextran‐wrapped nanoceria (dNC) previously demonstrated as a potent ROS scavenger. We quantitatively examine the effect of dNC, along with cerium ions, fullerenol, and DNA‐wrapped single‐walled carbon nanotubes (SWCNTs), on the ROS generation of isolated chloroplasts using the oxidative dyes, 2’,7’‐ dichlorodihydrofluorescein diacetate (H2DCF‐DA) and 2,3‐bis(2‐methoxy‐4‐nitro‐5‐sulfophenyl)‐2H‐tetrazolium‐5‐carboxanilide sodium salt (XTT). Electrochemical measurements confirm that chloroplasts processed from free solution can generate power under illumination. We find dNC to be the most effective of these agents for decreasing oxidizing species and superoxide concentrations whilst preserving chloroplast photoactivity at concentrations below 5 μM, offering a promising mechanism for maintaining regenerative chloroplast photoactivity for light‐harvesting applications.

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“…Thermodynamic equilibrium changes with variation in stress and strain due to point defects and related volume changes (Sheldon and Shenoy 2011). Nano-CeO 2 particles exhibit increased oxygen vacancies as the size of the particle decreases (Tsunekawa et al 1999;Deshpande et al 2005). The oxygen vacancy formation energy in CeO 2 is lower in nano-sized CeO 2 particles.…”

Section: Mechanism Of Resistance To Corrosionmentioning

confidence: 99%

Corrosion resistance of BIS 2062-grade steel coated with nano-metal-oxide mixtures of iron, cerium, and titanium in the marine environment

Ashraf

Anuradha

2018

Appl Nanosci

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BIS 2062-grade carbon steel is extensively used for fishing boat construction. The steel is highly susceptible to corrosion on the hull and welding joints under marine environment. Here, we demonstrate the application of a novel multifunctional nano-metal-oxide mixture comprised of iron, titanium, and cerium as a marine coating to prevent corrosion. The electrochemical performance of nano-metal-oxide mixture coatings, applied over boat-building steel, was evaluated at 3.5% NaCl medium. The nano-mixture surface coatings showed an efficient corrosion resistance with increased polarization resistance of 6043 Ω cm 2 and low corrosion current density of 3.53 × 10 −6 A cm −2 . The electrochemical impedance spectral data exhibited improvement in the polarization resistance of outermost surface and internal layers. The coating responded faster recovery to normal state when subjected to an induced stress over the coating. The nano-material in the coating behaves as a semiconductor; this enhanced electronic activity over the surface of the steel.

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Lattice relaxation of monosize CeO2−x nanocrystalline particles

Cited by 131 publications

References 8 publications

Electrical conductivity of ceria nanoparticles under high pressure

Electrical conductivity of ceria nanoparticles under high pressure

Application of Nanoparticle Antioxidants to Enable Hyperstable Chloroplasts for Solar Energy Harvesting

Corrosion resistance of BIS 2062-grade steel coated with nano-metal-oxide mixtures of iron, cerium, and titanium in the marine environment

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