Showing papers in "Ultrasonics Sonochemistry in 2009"

TL;DR: It is demonstrated that it is possible to create remarkably small transparent O/W nanoemulsions with average diameters as low as 40nm from sunflower oil using ultrasound or high shear homogenization and a surfactant/co-surfactant/oil system that is well optimised.

TL;DR: The sonophotocatalysis process has a futuristic application from an engineering and fundamental aspect in commercial applications and is an excellent opportunity to reduce reaction time and the amount of reagents used without the need for extreme physical conditions.

TL;DR: Among all ultrasound variables, temperature is the most sensitive on stability of phenolic compounds, and when Phenolic compounds from citrus peel extracts were subjected to ultrasound process, the benzoic acids were more stable than the cinnamic acids.

TL;DR: The present study clearly offers efficient extraction methodology from natural dye resources such as beetroot with ultrasound even dispensing with external heating, also making eco-friendly non-toxic dyeing of fibrous substances a potential viable option.

TL;DR: In this paper, the effect of 24kHz, high energy ultrasound in the presence and absence of titanium dioxide particles on the destruction of different bacteria groups was studied, and the results showed that the presence of 5g/L TiO(2) generally enhanced the degradation of gram-negative bacteria, yielding three to five logs reduction.

TL;DR: In this article, a simple sonochemical method was developed to synthesize uniform sphere-like or cubic Co(3)O(4) and Mn( 3)O (4) nanocrystals by using acetate salts and sodium hydroxide or tetramethylammonium hydroxides (TMAH) as precursors.

TL;DR: In the present study ultrasonic waves generated by an ultrasonic horn were used to disperse titanium dioxide nanoparticles into epoxy resin and the process parameters were varied systematically with the aim of achieving an optimum dispersion process.

TL;DR: The results showed that Nano-HAP can be obtained by this method and the particles were achieved to around 30 nm.

TL;DR: Investigating the influence of several parameters of the ultrasound process on the degradation of paracetamol and levodopa revealed that pollutants degradation proceeds principally through radical reactions, although some differences were observed between both molecules.

TL;DR: The magnetite nanoparticles were synthesized in an ethanol-water solution under ultrasonic irradiation from a Fe(OH)(2) precipitate and the monodispersibility of magnetite particles was improved significantly through the sonochemical synthesis in ethanol- water solution.

TL;DR: The results showed that the decolorization rate increased with the increase of hydrogen peroxide concentration and power density, but decreased with the increasing of initial pH value, and there existed an optimal iron powder addition when decolorized rate was concerned.

TL;DR: It has been found that the functionality of starch granules was significantly influenced by the length of sonication and the solution temperature, and the change in the pasting behaviour is explained in terms of the solubilisation of the swollen starch granule and starch aggregates induced by sonication.

TL;DR: The mechanism of bacterial inactivation by ultrasounds at high frequency is discussed here and the rate constants increase with the ultrasonic power delivered into the solution and dramatically decrease by the addition of t-butanol as a radical scavenger to the bacterial suspension.

TL;DR: Results indicated that, compared with conventional solvent extraction, the use of ultrasound gives a more effective extraction at lower temperatures with less dependence on the extraction solvent employed and that scale up of the process is possible.

TL;DR: Simultaneous analysis of the trends in degradation with different experimental techniques and simulation results reveals interesting mechanistic features of sonochemical degradation of the model pollutants.

TL;DR: The experiments indicate that the sonocatalytic method using composite TiO2/ZnO powder may be a more advisable choice for the treatments of non- or low-transparent organic wastewaters in future.

TL;DR: Under the conditions applied, all three systems proved to be effective in inducing diclofenac oxidation, leading to 22% of mineralization for O(3) and 36% for US after 40min of treatment, and to a significantly higher mineralization level for shorter treatment duration.

TL;DR: The use of ultrasonic irradiation allowed higher efficiency for sulfur removal in comparison to experiments performed without its application, under the same reactional conditions.

TL;DR: Results open new paths for the existing oxidation technologies for potable water and wastewater treatment as well as evaluate of possible beneficial effects on the use of coupled systems.

TL;DR: For the first time, zinc oxide nanoparticles have been synthesized by the sonochemical method in an ionic liquid, 1-hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide, liquid [hmim] as a solvent.

TL;DR: The scanning electron microscope images of the morphological and X-ray analyzes were measured for cationized cotton fabrics dyed with both conventional and ultrasound methods, thus showing the sonicator efficiency.

TL;DR: In this work, the sonolytic degradation of an anthraquinonic dye, AB25, in aqueous phase using high frequency ultrasound waves (1700kHz) for an acoustic power of 14W was investigated and the combination of ultrasound with hydrogen peroxide looks to be a promising option to increase the generation of free radicals.

TL;DR: Results indicate that ultrasound enhances the mass transport in the pores as well as across the boundary layer with increasing ultrasonic power for the three studied frequencies.

TL;DR: This study shows that the mild ultrasound irradiation can effectively improve the efficiency of pepsin extraction of natural collagen without any compromise of the resultant collagen quality.

TL;DR: Results have showed that ultrasonically assisted extraction in combination with under vacuum distillation have provided extracts with higher flavouring strength due to the increased concentration of desirable oxygenated compounds compared with hydrodistillation.

TL;DR: The dataset was arranged in a plot of normalized separation degree against the input energy, which suggests that effective separation was attained with a lower power input and a longer irradiation time.

TL;DR: This design may serve as a useful alternative for future sonoreactor design owing to its simplicity to produce dual- or multiple-frequency ultrasound.

TL;DR: Silica supported ammonium dihydrogen phosphate is found to be a recyclable heterogeneous catalyst for a rapid and efficient synthesis of various aryl-14-H-dibenzo[a,j]xanthenes with excellent yields using ultrasonic irradiation.

TL;DR: It is shown that the spent solution of sodium silicate can be multiply used for separation, its reuse even speeding up the yield of oil in the initial period and a functional form of the dependencies of separation efficiency on the mean size of solid particles and the temperature of a working medium is found.

TL;DR: The basic ionic liquid 1-butyl-3-methylimidazolium hydroxide, [bmIm]OH, efficiently catalyzes the condensation reaction of aldehydes and ketones with hydroxylamine hydrochloride under ultrasound irradiation, achieving higher yields and milder conditions.