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Ultrasonics Sonochemistry

Dui Qin, Lei Zhang, Nan Chang, Pengying Ni, Yujin Zong, Ayache Bouakaz, Mingxi Wan, Yi Feng
In this study, the bioeffects of acoustic droplet vaporization (ADV) on adjacent cells were investigated by evaluating the real-time cell response at the single-cell level in situ, using a combined ultrasound-exposure and optical imaging system. Two imaging modalities, high-speed and fluorescence imaging, were used to observe ADV bubble dynamics and to evaluate the impact on cell membrane permeabilization (i.e., sonoporation) using propidium iodide (PI) uptake as an indicator. The results indicated that ADV mainly led to irreversible rather than reversible sonoporation...
February 6, 2018: Ultrasonics Sonochemistry
Alejandro Martínez-Velasco, Consuelo Lobato-Calleros, Blanca E Hernández-Rodríguez, Angélica Román-Guerrero, Jose Alvarez-Ramirez, E Jaime Vernon-Carter
Response surface methodology was used for establishing the amplitude (72.67%) and time (17.29 min) high-intensity ultrasound (HIUS) conditions leading to an optimized faba bean protein isolate (OFPI) with lower interfacial tension, zeta potential and viscosity, and higher solubility than native faba bean protein isolate (NFPI). OFPI showed significantly higher adsorption dynamics at the air-water interface, and produced foam with significant smaller bubble diameter, higher overrun, stability and yield stress, and lower liquid drainage than NFPI...
June 2018: Ultrasonics Sonochemistry
Zhehao Sun, Cheng Liu, Zhen Cao, Wei Chen
High frequency ultrasonic radiation technology was developed as a novel and efficient means of regenerating spent biological activated carbon (BAC) used in drinking water treatment plants (DWTPs). The results of this study indicated that high frequency ultrasonic treatment could recover the spent BAC, to some extent, with the following optimal conditions: a frequency of 400 kHz, sonication power of 60 W, water temperature of 30 °C, and sonication time of 6 min. Under the above conditions, the iodine value increased from 300 mg/g to 409 mg/g, the volume of total pores and micropores increased from 0...
June 2018: Ultrasonics Sonochemistry
V Ramasamy Raja, D Rani Rosaline, A Suganthi, M Rajarajan
The NiO/Ag3 VO4 nanocomposite photocatalysts were developed by ultrasonic assisted preparation method to study the photocatalytic activity under visible light irradiation. The samples were characterized by UV-DRS, XRD, FT-IR, XPS, SEM, EDX, TEM, EIS and BET analysis. The photocatalytic activity of NiO/Ag3 VO4 nanocomposite for the photodegradation of 4-Nitro Phenol (4-NP) and Rose Bengal (RB) under visible light irradiation was studied and it is observed that the activity has been much higher than that of the pure Ag3 VO4 ...
June 2018: Ultrasonics Sonochemistry
Gooyong Lee, Shaliza Ibrahim, Shanmuga Kittappa, Heekyung Park, Chang Min Park
Novel heterostructured β-Bi2 O3 /Bi2 O2 CO3 nanoplates (hBN) were synthesized to observe the sonocatalytic degradation of bisphenol A (BPA) (widely used as a model pollutant) under ultrasonic (US) irradiation. Prior to obtaining the hBN, the Bi2 O2 CO3 micropowder precursor was prepared under hydrothermal conditions and then converted to hBN by increasing the calcination temperature to 300 °C. The synthesized hBN samples were characterized by field emission scanning electron microscope with energy dispersive X-ray analysis (FESEM/EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet-visible spectrophotometer diffuse reflection spectroscopy (UV-vis DRS), and X-ray photoelectron spectroscopy (XPS)...
June 2018: Ultrasonics Sonochemistry
Li Feng, Shuang Liu, Huaili Zheng, Jianjun Liang, Yongjun Sun, Shixin Zhang, Xin Chen
In this study, the ultrasonic (US)-initiated template copolymerization was employed to synthesize a novel cationic polyacrylamide (CPAM) characterized by a microblock structure using dimethyldiallylammonium chloride (DMDAAC) and acrylamide (AM) as monomers, and sodium polyacrylate (NaPAA) as template. The polymers structure property was analyzed by Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance spectroscopy (1 H NMR) and thermogravimetric analysis (TGA). The results showed that a novel cationic microblock structure was successfully synthesized in the template copolymer of DMDAAC and AM (TPADM)...
June 2018: Ultrasonics Sonochemistry
S Behnia, M Yahyavi, R Habibpourbisafar
Dynamics of a cluster of chaotic oscillators on a network are studied using coupled maps. By introducing the association schemes, we obtain coupling strength in the adjacency matrices form, which satisfies Markov matrices property. We remark that in general, the stability region of the cluster of oscillators at the synchronization state is characterized by Lyapunov exponent which can be defined based on the N-coupled map. As a detailed physical example, dynamics of microbubble cluster in an ultrasonic field are studied using coupled maps...
June 2018: Ultrasonics Sonochemistry
Asya Svirinovsky, Ilana Perelshtein, Michal Natan, Ehud Banin, Aharon Gedanken
Multifunctional substrates with superhydrophobic and biocidal properties are gaining interest for a wide range of applications; however, the production of such surfaces remains challenging. Here, the sonochemical method is utilized to impart superhydrophobicity and antimicrobial properties to a polyethylene (PE) sheet. This is achieved by sonochemically depositing nanoparticles (NPs) of a hydrophobic fluoro-polymer (FP) on the PE sheets. The polymer is a flexible, transparent fluoroplastic composed of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride in the form of a powder...
June 2018: Ultrasonics Sonochemistry
A L Nikolaev, A V Gopin, A V Severin, V N Rudin, M A Mironov, N V Dezhkunov
The size control of materials is of great importance in research and technology because materials of different size and shape have different properties and applications. This paper focuses on the synthesis of hydroxyapatite in ultrasound fields of different frequencies and intensities with the aim to find the conditions which allow control of the particles size. The results are evaluated by X-ray diffraction, Transmission Electron Microscopy, morphological and sedimentation analyses. It is shown that the hydroxyapatite particles synthesized at low intensity non-cavitation regime of ultrasound have smaller size than those prepared at high intensity cavitation regime...
June 2018: Ultrasonics Sonochemistry
Zahra Sharifalhoseini, Mohammad H Entezari, Mohsen Shahidi
Considering the current interest in the preparation of modified surfaces with fixed nanostructures, in this research, the hot water treatment was chosen as a simple and efficient procedure for the direct growth of ZnO nanostructures (ZnO NSs) on the metallic surface. To improve the method and reduce the cost of experiments, the commercial galvanized steel (steel containing a thin layer of zinc) was used as the base substrate. The use of the galvanized steel as an inexpensive and available metal surface has advantages compared to the pure Zn foil (used in other researches)...
June 2018: Ultrasonics Sonochemistry
Ya Su, Min Zhang, Bhesh Bhandari, Weiming Zhang
The combination of ultrasound and microwave in vacuum frying system was investigated to achieve higher drying efficiency and quality attributes of fried products. Purple-fleshed potato were used as test specimen and different power levels of microwave (0 W, 600 W, 800 W) and ultrasound (0 W, 300 W, 600 W) during vacuum frying. Drying kinetics, dielectric properties, moisture state variation and quality attributes of fried samples were measured in a vacuum frying (VF), and an innovatively designed ultrasound and microwave assisted vacuum frying (USMVF) equipment...
June 2018: Ultrasonics Sonochemistry
Yuequn Tao, Jun Cai, Xiulan Huai, Bin Liu
Antibiotics degradation remains a longstanding challenge in wastewater treatment. Towards this objective, we have developed a novel technique combining cavitating jets impingement with multiple synergetic methods, i.e., UV/Fenton, analogous Fenton, and photocatalytic oxidation in the present work. Three kinds of antibiotics namely amoxicillin, doxycycline and sulfadiazine sodium, are selected as model pollutants. Individual application of cavitating jets impingement is firstly conducted to evaluate the effects of jets impinging forms and nozzle inlet pressure...
June 2018: Ultrasonics Sonochemistry
Firouzeh Siadatnasab, Saeed Farhadi, Alireza Khataee
The sonocatalytic activity of the magnetic CuS/CoFe2 O4 (CuS/CFO) nanohybrid was studied through the H2 O2 -assisted system for degradation of water soluble organic pollutants such as methylene blue (MB), rhodamine B (RhB) and methyl orange (MO). The CuS/CFO nanohybrid was fabricated at 200 °C by hydrothermal method. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray microanalysis (EDX), Fourier-transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, magnetic measurements, and Brunauere-Emmette-Teller (BET) were employed for the characterizing the structure and morphology of the so-synthesized nanohybrid...
June 2018: Ultrasonics Sonochemistry
Xavier Sánchez-Sánchez, Alex Elias-Zuñiga, Marcelo Hernández-Avila
Ultrasonic injection moulding was confirmed as an efficient processing technique for manufacturing ultra-high molecular weight polyethylene (UHMWPE)/graphite composites. Graphite contents of 1 wt%, 5 wt%, and 7 wt% were mechanically pre-mixed with UHMWPE powder, and each mixture was pressed at 135 °C. A precise quantity of the pre-composites mixtures cut into irregularly shaped small pieces were subjected to ultrasonic injection moulding to fabricate small tensile specimens. The Taguchi method was applied to achieve the optimal level of ultrasonic moulding parameters and to maximize the tensile strength of the composites; the results showed that mould temperature was the most significant parameter, followed by the graphite content and the plunger profile...
June 2018: Ultrasonics Sonochemistry
Xin Rui Wang, Xing Ze Wang, Yong Li, Kun Liu, Shi Xin Liu, Jing Du, Zhuo Huang, Yan Luo, Jian Zhong Huo, Xiang Xia Wu, Yuan Yuan Liu, Bin Ding
In this work, a novel water-stable coordination polymer with {44 } network topology {[Zn(L)2 (NO3 )2 ]}n (1) (L = 4,4'-Bis(triazol-1-ylmethyl)biphenyl) has been synthesized through the hydrothermal and sonochemical approaches. 1 has been characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), Fourier Transform Infrared Spectroscopy, UV-vis absorption spectrum and scanning electron microscopy (SEM). PXRD patterns of the as-synthesized samples 1 have confirmed the purity of the bulky samples...
June 2018: Ultrasonics Sonochemistry
Karthikeyan Selvam, Priya Mandal, Harpreet Singh Grewal, Harpreet Singh Arora
Cavitation erosion remains the primary cause of material degradation in fluid machinery components operating at high speed. Micro-jets/shock waves caused by implosion of bubbles on material surface results in significant material loss and premature failure of the components. The presence of corrosive medium further exuberates this effect, causing rapid degradation. Here, we demonstrate a novel pathway to control cavitation erosion-corrosion by tailoring the surface properties using submerged friction stir processing (FSP), a severe plastic deformation process...
June 2018: Ultrasonics Sonochemistry
S Selvarajan, A Suganthi, M Rajarajan
A silver/polypyrrole/copper oxide (Ag/PPy/Cu2 O) ternary nanocomposite was prepared by sonochemical and oxidative polymerization simple way, in which Cu2 O was decorated with Ag nanoparticles, and covered by polyprrole (PPy) layer. The as prepared materials was characterized by UV-vis-spectroscopy (UV-vis), FT-IR, X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM) with EDX, high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS)...
June 2018: Ultrasonics Sonochemistry
V Ramasamy Raja, D Rani Rosaline, A Suganthi, M Rajarajan
This study presents a novel method for the preparation of Zn2 SnO4 /V2 O5 nanocomposites via a sonochemical aqueous route. This method is mild, convenient, cheap and efficient. The as prepared samples were characterized by XRD, SEM, EDAX, TEM, BET, FT-IR and UV-DRS spectra. DRS spectrum shows the adsorption edge of Zn2 SnO4 -V2 O5 in visible region of spectrum. The structural and morphological features of the as synthesized Zn2 SnO4 -V2 O5 nanocomposites have been observed using both scanning and transmission electron microscopy...
June 2018: Ultrasonics Sonochemistry
Shivendu Saxena, Sunil Rajoriya, Virendra Kumar Saharan, Suja George
In the present study, coagulation followed by cavitation was studied as a pretreatment tool for tannery waste effluent (TWE) with the aim of reducing its COD, TOC, TSS etc. and enhancing its biodegradability to make it suitable for anaerobic digestion. Initially, coagulation was applied to TWE using alum as a coagulant. The residual pH of treated effluent was found to be around pH of 4.5 where maximum COD and TSS reduction was achieved. In order to enhance the efficiency of pretreatment process, coagulated tannery waste effluent (CTWE) was further subjected to hydrodynamic cavitation (HC) and ultrasonication (US)...
June 2018: Ultrasonics Sonochemistry
Ubong Eduok, Jerzy Szpunar
Zinc molybdate (ZM) is a safer anticorrosive additive for cooling systems when compared with chromates and lead salts, due to its insolubility in aqueous media. For most molybdate pigments, their molybdate anion (MoO4 -2 ) acts as an anionic inhibitor and its passivation capacity is comparable with chromate anion (CrO4 -2 ). To alleviate the environmental concerns involving chromates-based industrial protective coatings, we have proposed new alternative in this work. We have synthesized ZM nanocrystals via ultrasound-assisted process and encapsulated them within an epoxy/PDMS coating towards corrosion protection...
June 2018: Ultrasonics Sonochemistry
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