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Ultrasonics Sonochemistry

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https://www.readbyqxmd.com/read/30322765/depolymerization-of-carboxymethyl-cellulose-using-hydrodynamic-cavitation-combined-with-ultraviolet-irradiation-and-potassium-persulfate
#1
Amrutlal L Prajapat, Parag R Gogate
In the present work, hydrodynamic cavitation (HC) has been used for the depolymerization of sodium salt of carboxymethyl cellulose (CMC) solution. Use of two different cavitating devices as slit and circular venturi has been investigated along with the combination of HC with potassium persulfate (KPS) and ultraviolet (UV) irradiation for understanding the process intensification benefits. The effect of operating parameters as inlet pressure (HC) and power dissipation (UV based treatment) on the degree of polymerization has been studied initially...
October 6, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30322764/optimization-and-modeling-of-simultaneous-ultrasound-assisted-adsorption-of-ternary-dyes-using-copper-oxide-nanoparticles-immobilized-on-activated-carbon-using-response-surface-methodology-and-artificial-neural-network
#2
Abdol Mohammad Ghaedi, Shahnaz Karamipour, Azam Vafaei, Mohammad Mehdi Baneshi, Vahid Kiarostami
The present study examines simultaneous adsorption of ternary dyes such as rose bengal (RB), safranin O (SO) and malachite green (MG) from aqueous media on copper oxide nanoparticles immobilized on activated carbon (CuO-NPs-AC) in a batch system. To forecast and optimize the adsorption, artificial neural network (ANN) and response surface methodology (RSM) were utilized. The effect of various factors, e.g. dye concentration, sonication time, adsorbent dosage and pH on the adsorption process were evaluated through five level six factor central composite design (CCD) using RSM...
October 6, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30327175/growth-control-of-leaf-lettuce-with-exposure-to-underwater-ultrasound-and-dissolved-oxygen-supersaturation
#3
Yuta Kurashina, Tatsuya Yamashita, Shuichi Kurabayashi, Kenjiro Takemura, Keita Ando
The growth rate of vegetables in plant factories can be regulated by environmental factors including light, temperature, and chemicals, which might give rise to mutation in leaf health. Here, we aim to devise a new way that allows for controlling the growth rate of plants in hydroponics as well as maintaining the product quality; we apply underwater ultrasound and dissolved oxygen supersaturation as external stimuli to plants. As an example, we examine the growth of leaf lettuce in hydroponics with exposure to 28-kHz ultrasound and dissolved oxygen supersaturation up to 36 mg/L at 20 °C...
October 5, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30327174/revision-of-the-mechanisms-behind-oil-water-o-w-emulsion-preparation-by-ultrasound-and-cavitation
#4
Tadej Stepišnik Perdih, Mojca Zupanc, Matevž Dular
Today emulsion preparation is receiving a lot of scientific attention, since emulsions are playing an essential role in many of the big industries, such as food, pharmaceutical or cosmetic industry. One of the most promising techniques for emulsion preparation is ultrasound emulsification. The purpose of this study is to expand the knowledge on the ultrasonically assisted emulsification model, that has not been amended since 1978. The model explains that oil-in-water emulsion formation is a two-step process...
October 4, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30322763/experimental-investigation-of-ultrasonic-treatment-effectiveness-on-pore-structure
#5
Ali Ghamartale, Mehdi Escrochi, Masoud Riazi, Ali Faghih
During the whole life of oil production, enhancing the efficiency and optimizing the production of wells always have been discussed. Formation damage is one of the most frequent reasons for oil wells productivity reduction. This phenomenon can be caused by different factors such as fine migration, drilling mud invasion, asphaltene precipitation, capillary blockage reservoir fluids, and inorganic precipitation. Acidizing and hydraulic fracturing are two conventional well treatment methods usually applied to overcome the formation damage...
October 4, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30314818/fabrication-of-al-and-al-si-alloy-microspheres-by-ultrasonic-irradiating-the-molten-salt-aluminum-immiscible-system
#6
Zhiming Wang
Microspheres of pure aluminum and Al-7wt%Si alloy were successfully fabricated by ultrasonic irradiating the molten NaCl-KCl-Al and NaCl-KCl-(Al-Si) systems respectively. Ultrasonic cavitation is mainly responsible for the formation of metal microspheres. A minimum diameter of ∼15 μm of the microspheres can be achieved. The final morphology and size of the metal spheres are determined by both the irradiation process and the subsequent solidification condition. Under the protection of molten salt, this process provides a novel way to fabricate spherical metal powder that has relative high activity and melting point...
October 3, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30293739/the-ultrasound-thermal-cracking-for-the-tar-sand-bitumen
#7
Qinzhen Fan, Gang Bai, Qing Liu, Ying Sun, Wei Yuan, Shuyao Wu, Xi-Ming Song, De-Zhi Zhao
The influence of ultrasonic irradiation on the tar-sand bitumen in the process of thermal cracking with an inert atmosphere was investigated thoroughly. The product distribution and coke characteristic produced by the conventional thermal cracking (CTC) and ultrasound thermal cracking (UTC) were invested at the following condition: ultrasound frequency 20 kHz, ultrasonic power 2000 W, reaction time 2 h, reaction temperature from 400 to 440 °C. The result of the liquid products distribution indicated that UTC can significantly increase gasoline yield and diesel yield, and dramatically reduce VGO (Vacuum Gas Oil) yield and residuum (greater than 500 °C) yield...
September 29, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30293737/vacuum-pretreatment-coupled-to-ultrasound-assisted-osmotic-dehydration-as-a-novel-method-for-garlic-slices-dehydration
#8
Yabin Feng, Xiaojie Yu, Abu ElGasim A Yagoub, Baoguo Xu, Bengang Wu, Lei Zhang, Cunshan Zhou
This study investigated the effects of multi-frequency mode ultrasound and vacuum technology on the water loss (WL) of garlic slices during osmotic dehydration (OD), and their effects on the microstructure of garlic. A new method of OD for garlic slices was proposed - Vacuum pretreatment coupled to ultrasound assisted osmotic dehydration (VUOD). The results indicated that the WL of the garlic slices treated with VUOD (21.12%) was significantly (p < 0.05) higher than slices treated with normally OD (NOD) (10...
September 29, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30322766/furfural-production-from-lignocellulosic-biomass-by-ultrasound-assisted-acid-hydrolysis
#9
Cezar A Bizzi, Daniel Santos, Tainara C Sieben, Gustavo V Motta, Paola A Mello, Erico M M Flores
Furanic platforms (e.g. furfural, furfuryl alcohol and hydroxymethylfurfural) can be obtained from biomass, being considered as a green alternative to petrochemical products such as fuels, and solvents. In this work, the use of ultrasound energy was investigated for the conversion of several lignocellulosic materials into furfural. The following parameters were evaluated: reaction time (30 to 120 min), ultrasound amplitude (20 to 70%) and feedstock amount (100 to 500 mg). The ultrasound-assisted acid hydrolysis (UAAH) process was applied to several lignocellulosic materials (sugar cane straw, rice husk, yerba-mate waste, grass and wood waste) aiming an investigation about the effects when working with real and complex feedstock...
September 27, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30293738/ultrasonic-assisted-fabrication-of-first-moo-3-copper-complex-bio-nanocomposite-based-on-sesbania-sesban-plant-for-green-oxidation-of-alcohols
#10
Atena Naeimi, Moones Honarmand, Asmaa Sedri
MoO3 nanoparticles were obtained using Sesbania sesban. Novel Schiff base ligand and its nanocomplex of copper were synthesized under ultrasonic irradiation. First MoO3 /Copper Schiff base complex nanocomposite (NMCS) based on this natural plant was prepared and characterized by TEM, SEM, AFM, FT-IR, TGA, EDAX and elemental analysis. Then atom-efficient and selective oxidation of alcohols using hydrogen peroxide catalyzed by NMCS bio-nanocomposite under ultrasonic irradiation was reported. Structurally diverse set of alcohols was transformed into desired aldehyde and ketone products with high conversion and excellent selectivity under solvent free conditions...
September 27, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30287179/ultrasound-assisted-oil-in-water-nanoemulsion-produced-from-pereskia-aculeata-miller-mucilage
#11
Amanda Maria Teixeira Lago, Isabelle Cristina Oliveira Neves, Natália Leite Oliveira, Diego Alvarenga Botrel, Luis Antonio Minim, Jaime Vilela de Resende
For the preparation of nanoemulsions, the correct choice of emulsifiers, together with the emulsification methods, directly influences the final product quality. The present study reports the ultrasound-assisted preparation of oil-in-water nanoemulsions produced with mucilage extracted from leaves of Pereskia aculeata Miller (ora-pro-nobis; OPN). The OPN mucilage (%) and soybean oil (%) concentration range, and the process operating parameters, ultrasonic power amplitude (%) and sonication time (min), were optimized based on the mean droplet diameter (d32 )...
September 27, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30274888/sonochemically-recovered-silver-oxide-nanoparticles-from-the-wastewater-of-photo-film-processing-units-as-an-electrode-material-for-supercapacitor-and-sensing-of-2-4-6-trichlorophenol-in-agricultural-soil-samples
#12
Elanthamilan Elaiyappillai, Sakthivel Kogularasu, Shen-Ming Chen, Muthumariappan Akilarasan, Christy Ezhilarasi Joshua, Princy Merlin Johnson, M Ajmal Ali, Fahad M A Al-Hemaid, M S Elshikh
The present work describes the sensing application and supercapacitive behavior of silver oxide nanoparticles recovered from wastewater of photo film processing units via one-pot green sonochemical recovery process. The recovered silver oxide nanoparticles (Ag2 O NPs) were characterized by spectral techniques such as FT-IR, Raman, UV-Vis and analytical tools such as XRD, FE-SEM, TEM, EDX, XPS and BET. In view of Ag2 O NPs as electrode material with wide technological applications, the recovered Ag2 O NPs were examined for their sensing and supercapacitive behavior...
September 25, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30274886/the-study-of-changes-in-raw-meat-salting-using-acoustically-activated-brine
#13
Olga Krasulya, Lina Tsirulnichenko, Irina Potoroko, Vladimir Bogush, Zhanna Novikova, Andrey Sergeev, Tatyana Kuznetsova, Sambandam Anandan
The article for the first time studies the kinetics of the activated brines diffusion inside meat based on the research of microstructure and nuclear magnetic resonance relaxation. The effect of ultrasound on the increase of hydration properties of pork proteins was found positive. The results of the experiments prove that spray penetration into not only interfibrillar spaces like during jetting but also inside muscle fibers leads to essential changes in meat structure, redistribution of brine components and acceleration of biochemical processes...
September 25, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30270006/sonochemical-driven-ultrafast-facile-synthesis-of-wo-3-nanoplates-with-controllable-morphology-and-oxygen-vacancies-for-efficient-photoelectrochemical-water-splitting
#14
Tayyebeh Soltani, Ahmad Tayyebi, Byeong-Kyu Lee
Among the various synthetic techniques, the sonochemical method has emerged as an interesting method for fabricating different photocatalysis materials with unique photoelectrochemical (PEC) properties. In comparison with the classical method without sonication, this study examines the promoting effect of ultrasonic irradiation during the synthesis of tungsten oxide (WO3 ) nanoplates within short reaction times (15 and 30 min). The shorter ultrasonic reaction time (15 min) was sufficient for the uniform growth of thin and compact layers of WO3 nanoparticles (NPs) on the surface of a tungsten foil...
September 25, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30322762/stimulation-of-low-intensity-ultrasound-on-fermentation-of-skim-milk-medium-for-yield-of-yoghurt-peptides-by-lactobacillus-paracasei
#15
Guoping Huang, Suwan Chen, Yingxiu Tang, Chunhua Dai, Ling Sun, Haile Ma, Ronghai He
Herein the effect of low intensity ultrasound on the fermentation of skim milk medium by Lactobacillus paracasei were investigated to obtain optimum ultrasonic conditions for the highest yield of yoghurt peptides. The results showed that the fermented skim milk medium treated with ultrasound with its seed culture without ultrasonic treatment was an optimum scheme. In this scheme with the ultrasonic conditions of 28 kHz, ultrasonic pulsed model of on-time 100 s and off-time 10 s, 100 W/L for the treatment time of 30 min after the fermentation time of 9 h, the peptide content in the fermented skim milk media increased by 49...
September 24, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30314819/formation-of-particle-of-bismuth-indium-alloys-and-particle-diameter-by-ultrasonic-cavitation
#16
Akio Furusawa, Kiyohiro Hine, Yamato Hayashi, Hirotsugu Takizawa
The miniaturization of electronic equipment requires fine bonding. Therefore, it is necessary to miniaturize the solder particles used for bonding different materials. Ultrasonic cavitation is a technique that uses ultrasonic irradiation to synthesize such microparticles. In this study, we investigated the effects of ultrasonic irradiation conditions on synthetic microparticles produced by this technique. Spherical particles were obtained by irradiating Bi-45 wt% In melted in a solvent with ultrasonic waves for 15 s, and the resultant metal composition was found to be equivalent to the raw material composition...
September 24, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30287181/ultrasonically-formation-of-supramolecular-based-ultrasound-energy-assisted-solidification-of-floating-organic-drop-microextraction-for-preconcentration-of-methadone-in-human-plasma-and-saliva-samples-prior-to-gas-chromatography-mass-spectrometry
#17
Maryam Ezoddin, Laleh Adlnasab, Akram Afshari Kaveh, Mohammad Ali Karimi
In this work, an ultrasonic-assisted supramolecular based on solidification of floating organic drop microextraction (UA-SM-SFO-ME) was developed as a green method for preconcentration of methadone prior to gas chromatography-mass spectrometry (GC-MS). The supramolecular solvent aggregates containing reverse micelles of 1-dodecanol in tetrahydrofuran (THF) were formed by ultrasonication that subsequently dispersed in the sample solution. Ultrasonic waves caused the fast formation of supramolecular solvent aggregates...
September 24, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30270007/mechanistic-investigation-in-degradation-mechanism-of-5-fluorouracil-using-graphitic-carbon-nitride
#18
G Kumaravel Dinesh, Sankar Chakma
The present study reports the synthesis of metal-free polymeric catalyst, graphitic carbon nitride (g-C3 N4 ), through sonochemical method followed by thermal treatment. The synthesized g-C3 N4 was characterized using XRD, DRS, FESEM, TGA, EDX, etc. and the characterization results revealed that it possesses medium band-gap energy, high thermal and chemical stability. The photo-activity of the catalyst was also evaluated using degradation of 5-Fluorouracil under different experimental conditions. The results revealed that the addition of H2 O2 during sonolysis process did not show any significant synergy...
September 24, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30274889/combined-effect-of-ultrasound-treatment-and-exogenous-phytohormones-on-the-accumulation-of-bioactive-compounds-in-broccoli-florets
#19
Miguel Aguilar-Camacho, Jorge Welti-Chanes, Daniel A Jacobo-Velázquez
Postharvest treatments such as wounding, ultrasound (US) and the exogenous application of ethylene (ET) and methyl jasmonate (MJ) have been studied as an effective tool to improve the content of secondary metabolites in fresh produce. The present study evaluated the immediate and late response (storage for 72 h at 15 °C) to US treatment (20 min, frequency 24 kHz, amplitude 100 μm) alone and combined with exogenous MJ (250 ppm) and/or ET (1000 ppm) on glucosinolates, isothiocyanates, phenolic compounds and ascorbic acid content in broccoli florets...
September 22, 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/30274887/synergistic-effect-of-sono-photocatalytic-process-for-the-degradation-of-organic-pollutants-using-cuo-tio-2-rgo
#20
Sundaram Ganesh Babu, Peramaiah Karthik, Miriam C John, Sandeep Kumar Lakhera, Muthupandian Ashokkumar, Jeehyeong Khim, Bernaurdshaw Neppolian
Combinations of different Advanced Oxidation Processes (AOPs) are being exploited for waste water treatment. The usage of ultrasound in photocatalysis finds much attention as the combined process offers some advantages over individual processes. Herein, we report the ultrasound assisted photocatalytic degradation of an organic pollutant (methyl orange as a model dye) in the presence of CuO-TiO2 /rGO photocatalyst which was prepared by a simple wet impregnation method. A synergistic effect (3.7-fold) was observed by combining the sonolysis and photocatalysis processes...
September 22, 2018: Ultrasonics Sonochemistry
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