Novel ceria–polymer microcomposites for chemical mechanical polishing

Coutinho, Cecil A.; Mudhivarthi, Subrahmanya R.; Kumar, Ashok; Gupta, Vinay

doi:10.1016/j.apsusc.2008.08.093

Cited by 42 publications

(14 citation statements)

References 49 publications

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“…CeO 2 is one of the most important rare-earth oxides, having numerous applications, such as in catalysis [11], fuel cells [12], polishing materials [13], oxygen gas sensors [14], optical devices [15]. Thus, nanocrystalline ceria has an important role in enhancing macroscopic properties, using its aliovalent tendency, tailoring crystallite sizes, and manipulating the surface area for these applications [16,17].…”

Section: Introductionmentioning

confidence: 99%

Non-monotonic lattice parameter variation in ball-milled ceria

2015

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High-energy ball milling is utilized in creating microstructural changes (such as change in lattice parameter, lattice strain) within micro-ceria, which were quantified using line profile analysis by X-ray diffraction. Crystallite size significantly decreased from 85 to 11 nm when subjected to 4 h of high-energy ball milling, and then remained same with increase in milling duration (up to 16 h of milling). Three different methods, namely NelsonRiley function, Cohen's method, and Pawley fitting, were used to calculate the lattice parameter and a lattice expansion from 5.4082 to 5.4147 Å was observed for a duration of 0 up to 12 h. The effect of milling on generation of residual strain and the probability of stacking fault in affecting the lattice parameter are delineated in the current work. Non-monotonic change of lattice parameter with saturation of crystallite size is attributed to the vacancy-induced stresses that generate at inter-crystallite regions and render excessive free volume during high-energy ball milling.

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Section: Introductionmentioning

confidence: 99%

Non-monotonic lattice parameter variation in ball-milled ceria

2015

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“…[1][2][3][4][5] CeO 2 has been used as an industrial catalyst for three-way catalysis (TWC) and the fluid catalytic cracking (FCC) process. [6][7][8] Ceria can be used as a polishing agent in the microelectronic industry for chemical mechanical planarization (CMP) 9,10 and as an oxygen ion conductor in solid oxide fuel cells, 11 amperometric oxygen monitors, 12 and oxygen pumps. 13 Ceria also finds other uses as luminescent material, 14 in gas sensors, 15 sunscreen cosmetics, 16 etc.…”

Section: Introductionmentioning

confidence: 99%

Engineering of nanoscale defect patterns in CeO₂ nanorods via ex situ and in situ annealing

et al. 2015

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Single-crystalline ceria nanorods were fabricated using a hydrothermal process and annealed at 325 °C-800 °C. As-synthesized CeO2 nanorods contain a high concentration of defects, such as oxygen vacancies and high lattice strains. Annealing resulted in an improved lattice crystalline quality along with the evolution of novel cavity-shaped defects in the nanorods with polyhedral morphologies and bound by e.g. {111} and {100} (internal) surfaces, confirmed for both air (ex situ) and vacuum (in situ) heating. We postulate that the cavities evolve via agglomeration of vacancies within the as-synthesized nanorods.

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“…A wide range of nanoparticles, such as carbon-based [18], ceramic [19], and metallic nanomaterials [20] can be incorporated/embedded within the hydrogel structure to obtain nanocomposites with tailored functionality [21]. Nanocomposite hydrogels, also known as hybrid hydrogels, are highly hydrated polymeric networks, either physically or covalently crosslinked with nanoparticles [22,23].…”

Section: Introductionmentioning

confidence: 99%

In situ formation of copper nanoparticles in a p(NIPAM-VAA-AAm) terpolymer microgel that retains the swelling behavior of microgels

Khan¹,

Shaikh²,

Siddiq

et al. 2015

Journal of Polymer Engineering

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Abstract Copper nanoparticles (CuNPs) are formed inside a microgel assembly by an in situ reduction method, confirmed by changes observed in the absorption spectra of CuNPs at different pH values. The presence of CuNPs has been also confirmed by X-ray diffraction (XRD) studies. The terpolymer microgel p(N-isopropylacrylamide-vinyl acetic acid-acrylamide) (p[NIPAM-VAA-AAm]), which is reported for the first time, was synthesized by free radical emulsion polymerization of a temperature-sensitive NIPAM monomer, pH sensitive VAA monomer and a hydrophilic AAm monomer. The effect of temperature below and above the pKa of VAA and the effect of pH at 20°C in the absence and presence of CuNPs on the hydrodynamic radius of microgel was studied. Size of microgel particles is a function of temperature due to the presence of NIPAM, and a function of pH due to the presence of VAA. The presence of CuNPs has little or no effect on the size of microgels by varying pH, which allows these gels to retain their properties with added benefits of CuNPs for possible drug delivery applications.

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Novel ceria–polymer microcomposites for chemical mechanical polishing

Cited by 42 publications

References 49 publications

Non-monotonic lattice parameter variation in ball-milled ceria

Non-monotonic lattice parameter variation in ball-milled ceria

Engineering of nanoscale defect patterns in CeO₂ nanorods via ex situ and in situ annealing

In situ formation of copper nanoparticles in a p(NIPAM-VAA-AAm) terpolymer microgel that retains the swelling behavior of microgels

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Novel ceria–polymer microcomposites for chemical mechanical polishing

Cited by 42 publications

References 49 publications

Non-monotonic lattice parameter variation in ball-milled ceria

Non-monotonic lattice parameter variation in ball-milled ceria

Engineering of nanoscale defect patterns in CeO2 nanorods via ex situ and in situ annealing

In situ formation of copper nanoparticles in a p(NIPAM-VAA-AAm) terpolymer microgel that retains the swelling behavior of microgels

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Engineering of nanoscale defect patterns in CeO₂ nanorods via ex situ and in situ annealing