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Ultrasonics Sonochemistry

Xu Lu, Jinghao Chen, Mingjing Zheng, Juanjuan Guo, Jingxuan Qi, Yingtong Chen, Song Miao, Baodong Zheng
In this paper, a coconut milk composite system (glycerin monostearate as an emulsifier) with different maize additives (e.g., maize kernels and starch with different amylose contents) was treated with high-intensity ultrasound irradiation (HIUS, frequency 20 kHz). The stability and structural features of the added coconut milk emulsion were studied. Comparing the mechanical emulsifications, coconut milk with maize kernels was similar to coconut milk with high-amylose maize starch. However, coconut milk with a high proportion of amylopectin had the best stability...
March 5, 2019: Ultrasonics Sonochemistry
Aniss Zaoui, Zakaria Cherifi, Mohammed Belbachir
Here we describe an efficient and rapid way for the polymerization of the 3-Octyl-1-vinylimidazolium Bromide using ultrasonic irradiation. This way promoted high dispersion polymerization using a water-soluble free radical initiator namely 4,4'-Azobis (4-cyanopentanoic acid) and free of dispersant. The ionic liquid monomer was prepared via quaternization of 1-vinylimidazole with octyl bromide also promoted by ultrasound. The polymerization rates were compared with a conventional heating method and appeared to be higher in the case of the ultrasound method within a short reaction time...
March 1, 2019: Ultrasonics Sonochemistry
Jonas T Guimarães, Eric Keven Silva, C Senaka Ranadheera, Jeremias Moraes, Renata S L Raices, Marcia C Silva, Micheli S Ferreira, Monica Q Freitas, M Angela A Meireles, Adriano G Cruz
This study evaluated the nutritional profile and volatile compounds present in a novel prebiotic (inulin) soursop whey beverage, due to the effects of high-intensity ultrasound (HIUS). The prebiotic soursop whey beverage was produced and processed by non-thermal high-intensity ultrasound varying the power (0, 200, 400 and 600 W) and by high-temperature short time (72 °C for 15 s) thermal treatment. Total acidity, pH, ascorbic acid content, total phenolics compounds content, antioxidant activity, hypertensive activity, fatty acid profile, volatile organic compounds, macro and micro minerals, as well as the heavy metals in these products, were analyzed...
February 28, 2019: Ultrasonics Sonochemistry
Márton Szabados, Adél Anna Ádám, Zoltán Kónya, Ákos Kukovecz, Stefan Carlson, Pál Sipos, István Pálinkó
The output power (30-150 W) and the periodicity (20-100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV-Vis-NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry...
February 26, 2019: Ultrasonics Sonochemistry
M A Almessiere, Y Slimani, A D Korkmaz, S Guner, M Sertkol, Sagar E Shirsath, A Baykal
Co-Tm nano-spinel ferrite with chemical formula CoTmx Fe2-x O4 (0.0 ≤ x ≤ 0.08) NPs were prepared via sonochemical approach. X-ray powder diffraction patterns, microscopic images (SEM and TEM) and infrared spectra proved the formation of Co spinel ferrite. The effect of Tm3+ substituted on spinal structure was evaluated by lattice parameters, tetrahedral and octahedral bond length and cationic distribution. The band gap energy (Eg) of samples were estimated by performing UV-Vis percent diffuse reflectance (% DR) and applying the Kubelka-Munk theory...
February 25, 2019: Ultrasonics Sonochemistry
Shukuan Lu, Xianbo Yu, Renyan Li, Yujin Zong, Mingxi Wan
Recently, passive acoustic mapping (PAM) has been successfully applied for dynamic monitoring of ultrasound therapy by beamforming acoustic emissions of cavitation activity during ultrasound exposure. The most widely used PAM algorithm in the literature is time exposure acoustics (TEA), which is a standard delay, sum, and integrate algorithm. However, it results in large point spread function (PSF) and serious imaging artifacts for the case where a narrow-aperture receiving array such as a standard B-mode linear array is used, therefore degrading the quality of cavitation image...
February 22, 2019: Ultrasonics Sonochemistry
Mariana P Santos, Mariana C Souza, Beatriz R Sumere, Laise C da Silva, Diogo T Cunha, Rosangela Maria N Bezerra, Mauricio A Rostagno
In this study it is proposed the introduction of an expansion gas in high pressure water to maximize the cavitation caused by the application of ultrasound to improve the extraction of phenolic compounds from pomegranate peel. Different combinations of ultrasound power (US-Pwr), expansion gas initial pressure (N2 -Pi), system pressure (SP) and particle size of sample were evaluated using water as solvent. The use of US-Pwr and N2 -Pi individually or combined improved the extraction process proving higher yields...
February 22, 2019: Ultrasonics Sonochemistry
N Contreras-Pereda, P Hayati, S Suárez-García, L Esrafili, P Retailleau, S Benmansour, F Novio, A Morsali, D Ruiz-Molina
Two novel cadmium-based 2D coordination polymers have been synthesized and characterized. Experimental results evidence that the best delamination processes occurs when weak interactions dominate the cohesion between layers and solvent molecules are occluded within the crystalline network. In this case, the delamination of the crystals occurs spontaneously in water. On top of that, and thanks to the high stability of the resulting (flake) colloidal dispersions, we have completed a detailed study of the sonication assisted delamination impact by: I) comparison of two different sonication approaches (bath vs...
February 20, 2019: Ultrasonics Sonochemistry
Yueh-Chan Lee, Chien-Ming Hsieh, Tsung-Neng Tsai, Da-Peng Yang, Pai-Shan Chen
An environmentally friendly thermosensitive nanovesicle-cloud point microextraction technique has been developed with the assistant of ultrasonic waves to determine analgesic drugs with a broad range of polarity in field water and human urine. Based on thin-film hydration, the conformation of nanovesicles formed by a binary mixing system with the nonionic surfactants was evaluated using regular and cryogenic transmission electron microscopy. The multilayered nano-spherical structure was able to capture polar and nonpolar compounds simultaneously...
February 19, 2019: Ultrasonics Sonochemistry
Abhijeet B Muley, Sandeep A Chaudhari, Sandip B Bankar, Rekha S Singhal
This paper reports on stabilization of serine cutinase activity by immobilizing it through cross linking with glutaraldehyde on magnetic nanoparticles (Fe-NPs) and intensification of catalytic activity by ultrasonic treatment. The optimum parameters were cross linking with 10.52 mM glutaraldehyde for 90 min using 1:2 (w/w) ratio of enzyme:Fe-NPs. The characterization of cutinase-Fe-NPs was done by different instrumental analysis. Ultrasonic power showed a beneficial effect on the activity of free and immobilized cutinase at 5...
February 18, 2019: Ultrasonics Sonochemistry
I Calinescu, A Vartolomei, I-A Gavrila, M Vinatoru, T J Mason
A laboratory scale ultrasonic flow reactor capable of enhancing enzymatic reactions has been built and characterized using as a model reaction the enzymatic synthesis of isoamyl acetate using Lipozyme 435 immobilized on a macroporous anion exchange resin. The efficiency of the reactor was determined in relation to ultrasonic power density (measured by 4-nitrophenol dosimetry), position of ultrasonic horn and temperature. The results show that ultrasound can enhance the process efficiency and also reduce the reaction time...
February 18, 2019: Ultrasonics Sonochemistry
L Vernès, M Abert-Vian, M El Maâtaoui, Y Tao, I Bornard, F Chemat
A green and innovative method, manothermosonication (MTS), for proteins extraction from dry Arthrospira platensis cyanobacteria assisted by ultrasound was designed in this work. Manothermosonication (probe, 20 kHz) was compared to a conventional process performed in the same conditions without ultrasounds. The extraction was carried out with a continuous flow rate at 15 mL/hour. Extraction parameters were optimized using a central composite design. Moreover, mathematic modelling and microscopic investigations were realized to allow a better understanding of ultrasound physical and structural effects on spirulina filaments and mass transfer phenomena over time...
February 18, 2019: Ultrasonics Sonochemistry
Tse-Wei Chen, Umamaheswari Rajaji, Shen-Ming Chen, R Jothi Ramalingam
Herein, we developed a silver nanoparticles decorated iron pyrite flowers (FeS2 @Ag NL) based nanocomposite was prepared by a sonochemical method. The formation of FeS2 @Ag NL nanocomposite was confirmed by XRD, XPS, HR-TEM and analytical techniques. The FeS2 @Ag NL/SPCE was potentially applied towards electrochemical detection of toxic herbicide (acifluorfen-AFF). This provided an efficient sensor platform anchoring FeS2 @Ag NL on its surface. Under optimized conditions of differential pulse voltammetric transduction, a linear relationship between the current and the concentration was obtained in the range of 0...
February 16, 2019: Ultrasonics Sonochemistry
Tse-Wei Chen, Umamaheswari Rajaji, Shen-Ming Chen, R Jothi Ramalingam
In this paper, mesoporous tungsten sulfide electrocatalyst (MP-WS2 ) were developed through a facile sonochemical technique (SC) and utilized as an electrocatalyst for the sensitive electrochemical detection of Psychoactive drug. The as-prepared SC-MP-WS2 NRs and HT-WS2 NPs (hydrothermally synthesized) were characterized using XRD, Raman, XPS, FESEM, HRTEM, BET, EDX, and electrochemical analysis, which exposed the formation of WS2 in the form of mesoporous nanorods in shape. Further, the use of the as-developed SC-MP-WS2 NRs and HT-WS2 NPs as an electrocatalyst for the detection of clonazepam (CNP)...
February 16, 2019: Ultrasonics Sonochemistry
Rajalakshmi Sakthivel, Subbiramaniyan Kubendhiran, Shen-Ming Chen
The present work reports the facile and cost-effective synthesis of rod like structured nickel doped bismuth sulphide (Ni-Bi2 S3 ) via the ultrasonication process. The sonochemical synthesis technique is rapid, simple, non-explosive, and harmless than other conventional synthesis technique. After the synthesis, the resultant material was characterized through the various spectrophotometric techniques including FESEM, EDX, XRD, XPS and EIS. After the structural evaluation, as-synthesized Ni-Bi2 S3 was applied for the electrocatalytic detection of promethazine hydrochloride (PMTZ) using CV and amperometry (i-t) techniques...
February 16, 2019: Ultrasonics Sonochemistry
Zhaoli Zhang, Feng Xiong, Yang Wang, Chunhua Dai, Zheng Xing, Mokhtar Dabbour, Benjamin Mintah, Ronghai He, Haile Ma
In this study, the influences of ultrasonic treatments with different working modes (fixed frequency and sweeping frequency) and various frequencies on the bacterial growth and metabolism yield of Saccharomyces cerevisiae (S. cerevisiae) were investigated by employing an in situ ultrasonic irradiation slot coupled with a flask fermentation equipment. The results revealed that the in situ ultrasonic treatment could promote the bacterial growth and metabolism yield, and the effect of fixed frequency ultrasound (FF) was higher than sweeping frequency ultrasound (SF)...
February 16, 2019: Ultrasonics Sonochemistry
A J Sojahrood, D Wegierak, H Haghi, R Karshfian, Michael C Kolios
The bubble oscillator is a highly nonlinear system, which makes it difficult to generate a comprehensive understanding of its oscillatory behavior. One method used to investigate such complex dynamical systems is the bifurcation analysis. Numerous investigations have employed the method of bifurcation diagrams to study the effect of different control parameters on the bubble behavior. These studies, however, focused mainly on investigating the subharmonic (SH) and chaotic oscillations of the bubbles. Super-harmonic (SuH) and ultra-harmonic (UH) bubble oscillations remain under-investigated...
February 13, 2019: Ultrasonics Sonochemistry
Zhigang Yi, Xuguang Ma, Jiuhua Song, Xiaorong Yang, Qiong Tang
In this study, complicated model sulfur compounds in crude oil were biodesulfurized in a batch process by microbial consortium enriched from oil contaminated soil. Dibenzothiophene (DBT) was selected as model sulfur compounds. Ultrasonic radiation was used to pre-oxidize the model sulfur compounds before the biodesulfurization (BDS) process. The enhancement mechanism of ultrasound pre-oxidation (UPO) on the biodesulfurization of DBT was investigated. The effects of initial conditions on the biodesulfurization of DBT in UPO/BDS system such as solution initial pH, DBT initial concentration, sulfur source, biocatalyst initial concentration, and incubation temperature were discussed...
February 12, 2019: Ultrasonics Sonochemistry
Liang Ee Low, See Kiat Wong, Siah Ying Tang, Chien Lye Chew, Hithanadura Ashcharya De Silva, Jacqueline May Vern Lee, Cheng Hao Hoo, Khor Kenrick
The current work proposed an alternative ultrasound (US) technology, namely the high-intensity ultrasonic tubular reactor (HUTR) for preparing Pickering emulsions. Using the non-toxic and environmentally friendly cellulose nanocrystal (CNC) as a solid stabilizer, Pickering emulsions were produced using the HUTR and the results showed that Pickering emulsions as small as 1.5 µm can be produced using HUTR at the US power and sonication time of 300 W and 15 min respectively. Additionally, the sizes of Pickering emulsion obtained are found to remain the same upon 30 days of storage...
February 11, 2019: Ultrasonics Sonochemistry
B Naidji, L Hallez, A Et Taouil, M Rebetez, J-Y Hihn
This paper provides proofs of the respective contributions of dissolved gases and solvent vapor on cavitation activity in sonoreactors. This activity can be detected by electrochemistry because the fluctuating events measured at the electrode surface are only linked to physical effects of cavitation. As ionic liquids present very low volatilities, their vaporization is reduced, and cavitation bubbles only depend on the presence of gases. Then, cavitation activity may be trigged by reactor atmosphere control...
February 11, 2019: Ultrasonics Sonochemistry
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