Basic Study on Dispersion and Surface Modification of Diamond Powders by Sonochemical Reaction

Uchida, Takeyoshi; Sato, Toshio; Takeuchi, Shinichi; Kuramochi, Naimu; Kawashima, Norimichi

doi:10.1143/jjap.42.2967

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…The solution was placed in an ultrasonic bath operated at a vibration frequency of 185 kHz for 30 min to prevent the formation of the nanodiamond clusters. It may be due to the acoustic cavitation effect [ 26 , 27 ] so that the ultrasonic wave heats up the water and breaks the water molecules into H + and OH − ions. The OH − ions attach onto the nanodiamond surface and induce a Coulomb repulsion force between nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

Protein Functionalized Nanodiamond Arrays

Liu

Sun

2010

Nanoscale Res Lett

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Various nanoscale elements are currently being explored for bio-applications, such as in bio-images, bio-detection, and bio-sensors. Among them, nanodiamonds possess remarkable features such as low bio-cytotoxicity, good optical property in fluorescent and Raman spectra, and good photostability for bio-applications. In this work, we devise techniques to position functionalized nanodiamonds on self-assembled monolayer (SAMs) arrays adsorbed on silicon and ITO substrates surface using electron beam lithography techniques. The nanodiamond arrays were functionalized with lysozyme to target a certain biomolecule or protein specifically. The optical properties of the nanodiamond-protein complex arrays were characterized by a high throughput confocal microscope. The synthesized nanodiamond-lysozyme complex arrays were found to still retain their functionality in interacting with E. coli.

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Section: Methodsmentioning

confidence: 99%

Protein Functionalized Nanodiamond Arrays

Liu

Sun

2010

Nanoscale Res Lett

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“…However, when these methods are used, such problems as (1) unstable dispersal effects, (2) poor reproducibility, and (3) reduced polishing efficiency due to adherence of surfactants are encountered [6][7][8]. We attempted to disaggregate nano-diamonds by exposing a nano-diamond suspension fluid to ultrasound in order to generate acoustic cavitation.…”

Section: Introductionmentioning

confidence: 99%

Disaggregation and surface modification of nano‐size diamond by ultrasound exposure: Relationships among acoustic intensity, disaggregation, and surface modification

Uchida

Hamano

Kawashima

et al. 2007

Electron Comm Jpn Pt III

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SUMMARYWe used ultrasound exposure to perform disaggregation and surface modification of aggregated nano-diamond particles. We formed a standing-wave sound field using a Langevin transducer to drive a stainless-steel vibrating disk installed at the bottom of a water tank, and generated efficient acoustic cavitation. With 20 minutes of ultrasonic exposure, we were able to reduce aggregated nano-diamond particles with average particle diameters of 5 µm to average particle diameters of 100 nm or less. We also confirmed that we had improved the zeta potential, an index of surface modification, by a factor of more than two. Furthermore, we used a hydrophone to measure the sound field inside the water tank, and calculated the average acoustic intensity at 800 W/m 2 or more to demonstrate that the nano-diamond surfaces had been modified. We confirmed that the zeta potential and average particle diameter of the nano-diamonds could be maintained for at least 150 days after ultrasound exposure.

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“…Therefore, we focus on acoustic cavitation and sonochemical reactions using ultrasound irradiation into a liquid. [3][4][5][6][7] Methods of efficient thickening and dehydration of sludge are investigated using a hot spot, activated oxygen, and a shock wave by acoustic cavitation. 8,9) We report the effects of the ultrasound exposure condition on the activated sludge in this paper.…”

Section: Introductionmentioning

confidence: 99%

Basic Study on Sludge Concentration and Dehydration with Ultrasonic Exposure

Sawada¹,

Nagashima²,

Uchida³

et al. 2005

Jpn. J. Appl. Phys.

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We study the condensation of sludge and the improvement of the dehydration efficiency of sludge by acoustic cavitation for efficiency improvement and cost reduction in water treatment. An ultrasound wave was irradiated into activated sludge in the water tank of our ultrasound exposure system and a standing wave acoustic field was formed using a vibrating disk driven by a Langevin-type transducer. The vibrating disk was mounted on the bottom of the water tank. Acoustic cavitation was generated in the activated sludge suspension and the sludge was floated to the water surface by ultrasound exposure with this system. We observed B-mode ultrasound images of the activated sludge suspension before ultrasound exposure and that of the floated sludge and treated water after ultrasound exposure. The ultrasound diagnostic equipment was used for the observation of the B-mode ultrasound images of the sludge. It was found that the sludge floated to the water surface because of adhesion of microbubbles generated by acoustic cavitation to the sludge particles, which decreased the sludge density. It can be expected that the drifting sludge in water can be recovered by the flotation thickening method of sludge as an application of the results of this study. It is difficult to recover the drifting sludge in water by the conventional gravity thickening method.

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Basic Study on Dispersion and Surface Modification of Diamond Powders by Sonochemical Reaction

Cited by 14 publications

References 4 publications

Protein Functionalized Nanodiamond Arrays

Protein Functionalized Nanodiamond Arrays

Disaggregation and surface modification of nano‐size diamond by ultrasound exposure: Relationships among acoustic intensity, disaggregation, and surface modification

Basic Study on Sludge Concentration and Dehydration with Ultrasonic Exposure

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