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Ultrasonics Sonochemistry

Ruzaina Rayathulhan, Bashiru Kayode Sodipo, Azlan Abdul Aziz
ZnO nanorods were directly grown on four different wires (silver, nickel, copper, and tungsten) using sonochemical method. Zinc nitrate hexahydrate and hexamethylenetetramine (HMT) were used as precursors. Influence of growth parameters such as precursors' concentration and ultrasonic power on the grown nanorods were determined. The results demonstrated that the precursor concentration affected the growth structure and density of the nanorods. The morphology, distribution, and orientation of nanorods changed as the ultrasonic power changed...
October 10, 2016: Ultrasonics Sonochemistry
Ritu Bala, Jagriti Behal, Varinder Kaur, Subheet Kumar Jain, Riveka Rani, Rajesh Kumari Manhas, Vinit Prakash
Using ultrasonic irradiations, nano-sized cobalt(III) coordination complexes, [Co(NH3)6]Cl3·2H2O (A), [Co(en)3]Cl3·3H2O (B) (en-ethylenediamine) and [Co(dien)2]Cl3·3.5H2O (C) (dien-diethylenetriamine) were synthesized. These complexes were characterized by spectroscopic studies like IR, UV/Visible and NMR. Morphology of these complexes was determined by SEM and particle size with the help of TEM & Zeta-sizer. The comparative thermal stability along with phase difference between nano structures and their respective bulk complexes has been studied by thermal gravimetric analysis (TGA) and X-ray powder diffraction (XRD) study respectively...
October 8, 2016: Ultrasonics Sonochemistry
J Mulinari, B Venturin, M Sbardelotto, A Dall Agnol, T Scapini, A F Camargo, D P Baldissarelli, T A Modkovski, V Rossetto, C Dalla Rosa, F W Reichert, S M Golunski, I Vieitez, G D L P Vargas, C Dalla Rosa, A J Mossi, H Treichel
This study aimed to evaluate the waste cooking oil (WCO) hydrolysis in ultrasonic system using lipase as catalyst. Lipase was produced by the fungus Aspergillus niger via solid state fermentation (SSF) using canola meal as substrate. Prior to the hydrolysis reaction, the lipase behavior when subjected to ultrasound was evaluated by varying the temperature of the ultrasonic bath, the exposure time and the equipment power. Having optimized the treatment on ultrasound, the WCO hydrolysis reaction was carried out by evaluating the oil:water ratio and the lipase concentration...
October 8, 2016: Ultrasonics Sonochemistry
Babak Mirtamizdoust
Nano-sheets of a novel Pb(II)-based 3D metal-organic coordination polymer [Pb2(nih)2(NO3)4(CH3OH)]n (1) were synthesized by a branched-tube method and sonochemical reaction. The synthesis was done using various times, concentrations of initial reagents, and irradiation power. The compound was characterized by scanning electron microscopy (SEM), elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray powder diffraction (XRD), and single-crystal X-ray analysis...
October 3, 2016: Ultrasonics Sonochemistry
Aydin Hassani, Alireza Khataee, Semra Karaca, Canan Karaca, Peyman Gholami
TiO2/Montmorillonite (TiO2/MMT) nanocomposite as sonocatalyst was produced by immobilizing synthesized TiO2 on the surface of montmorillonite. The characteristics of produced nanocomposite were investigated using XRD, XRF, FTIR, TEM, SEM, EDX, UV-vis DRS and nitrogen adsorption-desorption analyses. The synthesized TiO2 and TiO2/MMT samples were applied as catalysts for sonocatalytic degradation of ciprofloxacin (CIP). The performance of the TiO2/MMT was greater than pure TiO2 sample in treatment of CIP solution...
October 1, 2016: Ultrasonics Sonochemistry
Hossein Hamidi, Amin Sharifi Haddad, Erfan Mohammadian, Roozbeh Rafati, Amin Azdarpour, Panteha Ghahri, Peter Ombewa, Tobias Neuert, Aaron Zink
CO2 flooding process as a common enhanced oil recovery method may suffer from interface instability due to fingering and gravity override, therefore, in this study a method to improve the performance of CO2 flooding through an integrated ultraosund-CO2 flooding process is presented. Ultrasonic waves can deliver energy from a generator to oil and affect its properties such as internal energy and viscosity. Thus, a series of CO2 flooding experiments in the presence of ultrasonic waves were performed for controlled and uncontrolled temperature conditions...
September 30, 2016: Ultrasonics Sonochemistry
Y M Hunge, M A Mahadik, A V Moholkar, C H Bhosale
The WO3 and stratified WO3/TiO2 thin films are successfully prepared by the spray pyrolysis method. The structural, morphological, compositional and photoelectrocatalytic properties of WO3 and stratified WO3/TiO2 thin films are studied. XRD analysis confirms that films are polycrystalline with monoclinic and tetragonal crystal structures for WO3 and TiO2 respectively. The SEM images clearly show 3D sheeted porous structure of the as-prepared TiO2 forms on WO3 in stratified WO3/TiO2 samples. The synthesized photoelectrodes was used as catalyst for photoelectrocatalytic degradation of oxalic acid in aqueous medium...
September 28, 2016: Ultrasonics Sonochemistry
Faeze Mojtabazade, Babak Mirtamizdoust, Ali Morsali, Pejman Talemi
A sonochemical method by using various time and concentrations of initial reagents and power of irradiation, was used to synthesize nano-card house of a new copper(II) metal-organic coordination system, {[Cu2(p-2yeinh)2Cl2]·(H2O)}n (1), where p-2yeinh=pyridin-2-yl ethylidene-isonicotinohydrazide. The compound was characterized by scanning electron microscopy (SEM), elemental analysis, IR spectroscopy, X-ray powder diffraction (XPRD), and single crystal X-ray analysis. The X-ray structure revealed that the Cu(II) atom is coordinated by one oxygen and three nitrogen atoms from two p-2yeinh ligands and one chloride anion with a CuN3OCl donor set with square pyramid geometry...
September 28, 2016: Ultrasonics Sonochemistry
Ling-Xia Zuo, Li-Ping Jiang, E S Abdel-Halim, Jun-Jie Zhu
Porous MnO2 as a non-noble metal oxygen reduction reaction (ORR) electrocatalyst was prepared by a simple sonochemical route. The as-prepared porous MnO2 exhibited higher electrocatalytic activity, superior stability and better methanol tolerance than commercial Pt/C catalyst in alkaline media. Furthermore, the ORR proceeded via a nearly four-electron pathway. Cyclic voltammetry (CV) and rotating-disk electrode (RDE) measurements verified that the ORR enhancement was attributed to the porous structure and good dispersity, which facilitated sufficient transport of ions, electrons, O2 and other reactants in the process of ORR...
September 28, 2016: Ultrasonics Sonochemistry
Ozkan Acisli, Alireza Khataee, Reza Darvishi Cheshmeh Soltani, Semra Karaca
Nano-sized siderite was used as catalyst for the heterogeneous Fenton process combined with ultrasonic irradiation to degrade reactive yellow 81 (RY-81) in the aqueous phase. As the most efficient process, nano-sized siderite prepared via ball milling was chosen to carry out the experiments. 6h milled siderite at initial pH of 3.0 led to the highest removal efficiency of 92.09% within the reaction time of 30min. At a short reaction time of 20min, increasing siderite nanoparticles dosage from 0.3 to 0.75g/L resulted in increasing removal efficiency from 49...
September 24, 2016: Ultrasonics Sonochemistry
J Prakash Maran, B Priya, Naif Abdullah Al-Dhabi, K Ponmurugan, I Ganesh Moorthy, N Sivarajasekar
The objectives of the present work are to extract pectin from industrial waste of Musa balbisiana by ultrasound assisted citric acid mediated extraction method and optimization was done through central composite statistical experimental design under response surface methodology. The outcomes of this study exhibited that, process variables (ultrasound power, pH and extraction time) had considerable influence on the pectin extraction. Second order mathematical equation was constructed to predict the data through regression analysis...
September 24, 2016: Ultrasonics Sonochemistry
A J Expósito, J M Monteagudo, A Durán, A Fernández
The aim of this study was to examine the kinetics of the different mechanisms (radical pathway, photolysis, molecular reaction with H2O2 and reaction with ultrasonically generated oxidative species) involved in the homogeneous sono-photoFenton (US/UV/H2O2/Fe) mineralization of antipyrine present in a synthetic municipal wastewater effluent (ASMWE). The dynamic behavior of hydroxyl (HO) radical generation and consumption in mineralization reaction under different systems was investigated by measuring hydroxyl radical concentration during the reaction...
September 24, 2016: Ultrasonics Sonochemistry
Atul H Bari, Aseem Chawla, Aniruddha B Pandit
Application of ultrasound in crystallization has showed improved process characteristics. Although several attempts have been made in the past to study the sono-crystallization kinetics, only nucleation and crystal growth were considered, neglecting breakage and agglomeration of crystals. In this study, an attempt is made for the estimation of the kinetic parameters of all the phenomena occurring simultaneously during sono-crystallization. For this, both conventional and ultrasonic crystallization of K2SO4-water system has been reported...
September 22, 2016: Ultrasonics Sonochemistry
Yutong Lin, Lizhou Lin, Mouwen Cheng, Lifang Jin, Lianfang Du, Tao Han, Lin Xu, Alfred C H Yu, Peng Qin
SonoVue microbubbles could serve as artificial nuclei for ultrasound-triggered stable and inertial cavitation, resulting in beneficial biological effects for future therapeutic applications. To optimize and control the use of the cavitation of SonoVue bubbles in therapy while ensuring safety, it is important to comprehensively understand the relationship between the acoustic parameters and the cavitation behavior of the SonoVue bubbles. An agarose-gel tissue phantom was fabricated to hold the SonoVue bubble suspension...
September 20, 2016: Ultrasonics Sonochemistry
Fengli Chen, Qiang Zhang, Shimin Fei, Huiyan Gu, Lei Yang
In this study, ultrasonic circulating extraction (UCE) technique was firstly and successfully applied for extraction of samara oil from Acer saccharum. The extraction kinetics were fitted and described, and the extraction mechanism was discussed. Through comparison, n-hexane was selected as the extraction solvent, the influence of solvent type on the responses was detailedly interpreted based on the influence of their properties on the occurrence and intensity of cavitation. Seven parameters potentially influencing the extraction yield of samara oil and content of nervonic acid, including ultrasound irradiation time, ultrasound irradiation power, ultrasound temperature, liquid-solid ratio, soaking time, particle size and stirring rate, were screened through Plackett-Burman design to determine the significant variables...
September 20, 2016: Ultrasonics Sonochemistry
Wenjing Yang, Yufeng Zhou
Vascular occlusion by the thrombi is the main reason for ischemic stroke and deep vein thrombosis. High-intensity focused ultrasound (HIFU) and histotripsy or microtripsy pulses can effectively dissolve the blood clot with no use of thrombolytic agent and ultrasound contrast agent (microbubbles). In this study, HIFU bursts at the same duty cycle (2%) but varied pulse repetition frequency (PRF) from 1Hz to 1000Hz were delivered to in vitro porcine blood clot for 30s. Thrombolysis efficiency initially increases slightly with the PRF, 86...
September 19, 2016: Ultrasonics Sonochemistry
O Louisnard
The steady liquid flow observed under ultrasonic emitters generating acoustic cavitation can be successfully predicted by a standard turbulent flow calculation. The flow is driven by the classical averaged volumetric force density calculated from the acoustic field, but the inertial term in Navier-Stokes equations must be kept, and a turbulent solution must be sought. The acoustic field must be computed with a realistic model, properly accounting for dissipation by the cavitation bubbles [Louisnard, Ultrason...
September 17, 2016: Ultrasonics Sonochemistry
Sahar Dehghani, Mohammad Haghighi
Sono-sulfated zirconia nanocatalyst supported on MCM-41 was prepared by an ultrasound-assisted impregnation/hydrothermal hybrid method. The effect of irradiation power was studied by changing power of the sonication (30, 60 and 90W) during the synthesis which led to different physiochemical properties of the nanocatalyst. XRD, FESEM, EDX, FTIR and BET analyses exhibited smaller particles with higher surface area and less population of particle aggregates at highly irradiated nanocatalysts. The nanocatalyst irradiated at 90W for 30min showed a very narrow particle size distribution...
September 14, 2016: Ultrasonics Sonochemistry
R Galleguillos-Silva, Y Vargas-Hernández, L Gaete-Garretón
Ultrasonic radiation can modify some physical properties in liquid/solid interactions, such as wettability. The dependence of solid surface wettability on its vibrational state was studied. Experiments with an interface formed by distilled water deposited on a titanium alloy and surrounded by air were carried out. It is shown that it is possible to control the apparent wettability of a given liquid/solid/gas system by applying sonic-ultrasonic vibrations of controlled amplitude at the interface. The system studied is composed of a drop of distilled water deposited on a flat titanium surface in air...
September 13, 2016: Ultrasonics Sonochemistry
Marlene Lariza Andrade Guel, Lourdes Díaz Jiménez, Dora Alicia Cortés Hernández
Synthesis of tetragonal ZrO2 by both conventional sol-gel and ultrasound-assisted sol-gel methods and using a non-ionic surfactant Tween-20, was performed. A porous microstructure composed of nanometric particles was observed. Tetragonal ZrO2 was obtained using a low heat treatment temperature of powders, 500°C by both methods. A higher crystallinity and a shorter reaction time were observed when ultrasound was used in the sol-gel method due to the cavitation phenomenon.
September 13, 2016: Ultrasonics Sonochemistry
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