Micro- and nano-spheres of low melting point metals and alloys, formed by ultrasonic cavitation

Friedman, H.; Reich, S.; Popovitz‐Biro, Ronit; Huth, Palle von; Halevy, I.; Koltypin, Yuri; Gedanken, Aharon; Porat, Ze’ev

doi:10.1016/j.ultsonch.2012.08.009

Cited by 51 publications

(25 citation statements)

References 24 publications

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“…In conjunction with injected micro-bubbles, HIU can induce high speed fluid micro-jets [ Fig. 3(E), left] that are strong enough to forge or break metal 63,64 . Micro-jets present a method to physically modify both hard and soft tissue.…”

Section: Basic Ultrasonic Principlesmentioning

confidence: 99%

The potential utility of high-intensity ultrasound to treat osteoarthritis

Nieminen

Salmi

Karppinen

et al. 2014

Osteoarthritis and Cartilage

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Osteoarthritis (OA) is a widespread musculoskeletal disease that reduces quality of life and for which there is no cure. The treatment of OA is challenging since cartilage impedes the local and systemic delivery of therapeutic compounds (TCs). This review identifies high-intensity ultrasound (HIU) as a non-contact technique to modify articular cartilage and subchondral bone. HIU enables new approaches to overcome challenges associated with drug delivery to cartilage and new non-invasive approaches for the treatment of joint disease. Specifically, HIU has the potential to facilitate targeted drug delivery and release deep within cartilage, to repair soft tissue damage, and to physically alter tissue structures including cartilage and bone. The localized, non-invasive ultrasonic delivery of TCs to articular cartilage and subchondral bone appears to be a promising technique in the immediate future.

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Section: Basic Ultrasonic Principlesmentioning

confidence: 99%

The potential utility of high-intensity ultrasound to treat osteoarthritis

Nieminen

Salmi

Karppinen

et al. 2014

Osteoarthritis and Cartilage

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“…7 Nanoparticles of alloys can have different phase behavior, such as solubility of one of the components, melting and crystallization, very different from the corresponding bulk alloys. 14 Recently, we reported on the formation of gallium microspheres by ultrasonic irradiation of molten gallium in either water or in silicone oil. 9 Micro-and nanoparticles of alloys were prepared using various methods (such as laser ablation, and ultrasonic, sol-gel, and hydrothermal techniques, etc.).…”

Section: Introductionmentioning

confidence: 99%

Formation of particles of bismuth-based binary alloys and intermetallic compounds by ultrasonic cavitation

et al. 2015

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This work describes the interactions of molten bismuth with other low-melting point metals (Sn, In, Ga and Zn) under sonication. Binary combinations of bismuth and one of these metals were melted together in hot silicone oil and irradiated with ultrasonic energy to form micro/nano alloy particles. The morphology, composition and crystal structure of these particles were analyzed. It was found that bismuth forms metal matrix composites with tin and zinc, intermetallic compounds with indium and an alloy with gallium. We also followed the structural changes in the system by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and electron microscopy.

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“…According to the former, the shock waves, which are produced by the collapse of bubbles, can result in dendrite fragmentation and promote nucleation events . In the latter cavitation enhances the wettability of impurities, which enables the impurities to act as nucleation sites . At present these mechanisms are not fully understood.…”

Section: Ultrasonic Antifouling Of Membrane Filtersmentioning

confidence: 99%

Ultrasonic Mastering of Filter Flow and Antifouling of Renewable Resources

Radziuk

Möhwald

2016

ChemPhysChem

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Abstract:Inadequate access to purify water and sanitation requires new ergonomic methods at lower cost, less energy consumption, minimal use of chemicals and impact on the environment. Among them ultrasound is a unique means to control physics and chemistry of complex fluid (wastewater) with excellent performance in mass transfer, cleaning and disinfection. In membrane filtration processes it overcomes diffusion limits and can accelerate the fluid flow towards the filter preventing antifouling. Here we outline the current state of knowledge and technological design with the focus on physico-chemical strategies of ultrasound for water cleaning. We highlight important parameters of ultrasound for the delivery of fluid flow from a technical perspective employing principles of physics and chemistry. By introducing various ultrasonic methods involving bubbles or cavitation in combination with external fields we show advancements in flow acceleration and mass transportation to the filter. In most of them we emphasize the main role of streaming and impact of cavitation with a perspective to prevent and remove fouling deposits during the flow. We also elaborate on the deficiencies of present technology and on problems to be solved to achieve a wide spread application.

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Micro- and nano-spheres of low melting point metals and alloys, formed by ultrasonic cavitation

Cited by 51 publications

References 24 publications

The potential utility of high-intensity ultrasound to treat osteoarthritis

The potential utility of high-intensity ultrasound to treat osteoarthritis

Formation of particles of bismuth-based binary alloys and intermetallic compounds by ultrasonic cavitation

Ultrasonic Mastering of Filter Flow and Antifouling of Renewable Resources

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