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Ultrasonics Sonochemistry

Arup Jyoti Borah, Mayank Agarwal, Arun Goyal, Vijayanand S Moholkar
Invasive weeds ubiquitously found in terrestrial and aquatic ecosystems form potential feedstock for lignocellulosic ethanol production. The present study has reported a bioprocess for production of ethanol using mixed feedstock of 8 invasive weeds found in India. The feedstock was subjected to pretreatment comprising dilute acid hydrolysis (for hydrolysis of hemicellulosic fraction), alkaline delignification and enzymatic hydrolysis of cellulosic fraction. Pentose-rich and hexose-rich hydrolyzates obtained from pretreatment were fermented separately using microbial cultures of S...
August 1, 2018: Ultrasonics Sonochemistry
Lifeng Xu, Shuangling Zhong, Chao Shi, Yuexin Sun, Shengnan Zhao, Yan Gao, Xuejun Cui
In this work, a novel, biocompatible, non-immunogenic and reductive-responsive magnetic starch-based microcapsules (RMSMCs) were designed and fabricated successfully via a facile sonochemical method for targeted delivery and triggered release of hydrophobic drugs. TEM image indicated that oleic acid (OA) modified Fe3 O4 nanoparticles (OA-Fe3 O4 NPs) were encapsulated into RMSMCs. The obtained RMSMCs were endowed with magnetism for drug targeted delivery because that the superparamagnetic OA-Fe3 O4 NPs were encapsulated into RMSMCs...
August 1, 2018: Ultrasonics Sonochemistry
M Morales-de la Peña, O Martín-Belloso, J Welti-Chanes
Ultrasound (US) was applied as a pre-treatment in hydrated soybeans (HSB) and soybean slurry (SBS) during soymilk elaboration process to evaluate the feasibility of increasing the isoflavone content (IC) in the resultant soymilk. A predictive model and optimum US processing conditions were obtained by response surface methodology (RSM) using a three-level-three-factor Box-Behnken statistical design (BBD) in which US amplitude (50, 75, and 100%), temperature (30, 45, and 60 °C), and time (20, 40, and 60 min) were selected as independent variables...
July 31, 2018: Ultrasonics Sonochemistry
Anwar J Sayyed, Lalaso V Mohite, Niteen A Deshmukh, Dipak V Pinjari
The present study deals with the effect of ultrasound on the swelling and dissolution behavior of the cellulose pulp. Hardwood, acid sulfite cellulose pulp sheets were sonicated at different temperatures, operated at a fixed frequency (37 kHz) and power (320 W) to break the intermolecular forces and hydrogen bonds of crystalline region. The obtained samples were evaluated for crystallinity, intrinsic viscosity, molecular weight (MW), molecular weight distribution (MWD) and surface morphology. It was observed that the crystallinity reduced from 61...
July 30, 2018: Ultrasonics Sonochemistry
Hugo M Oliveira, Alice Q Pinheiro, António J M Fonseca, Ana R J Cabrita, Margarida R G Maia
The present report studied the role of ultrasound (US) energy in the amyloglucosidase-based starch hydrolysis using two complementary approaches: (i) in the activity of six commercially-available amyloglucosidases (using soluble starch as substrate), and (ii) in the hydrolysis of four pure starches from different botanical sources. This corresponds to the first systematic evaluation of the role of US in starch hydrolysis mediated by amyloglucosidase, being a consequence of our previous report that assessed the effect of US in the activity of alpha-amylase (LWT - Food Science and Technology 84 (2017) 674-685)...
July 29, 2018: Ultrasonics Sonochemistry
Krishna P Solanki, Meghal A Desai, Jigisha K Parikh
Environmental benign approach for extraction of essential oil was made. An essential oil rich in citronellol, linalool and citronellal was extracted from the leaves of Cymbopogon winterianus using a clean hybrid extraction technique, sono hydrodistillation. Sono hydrodistillation combines ultrasonic waves along with conventional hydrodistillation process to have symbiotic outcomes in terms of process improvement. Significant process parameters such as size of the plant material, extraction time, power, ultrasound amplitude, pulse interval and solid loading were investigated independently to study the effect on yield of oil and composition of oil...
July 29, 2018: Ultrasonics Sonochemistry
Chang-Cheng Zhao, Jong-Bang Eun
The effects of ultrasound application on the brining kinetics of Chinese cabbage leaves was evaluated at different NaCl concentrations (10, 15, and 20%) of the brine, and its influence on textural properties and salt distribution was also investigated. To identify the effects of these two factors on water and NaCl fluxes, the kinetics of transport was analyzed by taking the diffusion theory into account. The results showed that NaCl concentration and ultrasound application significantly affected moisture and NaCl transport...
July 29, 2018: Ultrasonics Sonochemistry
Haoyu Li, Shiwei Li, C Srinivasakannan, Libo Zhang, Shaohua Yin, Kun Yang, Huimin Xie
The process to fast recovery of silver from the spent symbiosis lead-zinc mine enhanced by ultrasound has been developed. A system composed of thiosulfate and the spent symbiosis lead-zinc mine under ultrasound radiation is researched and compared with regular methods to prove the superiority of ultrasound enhanced leaching. Oxygen is not provided by the usual way but by the cavitation of ultrasound, and the effect of ultrasonic enhanced leaching is more obvious than oxygen enhanced leaching effect. We are more authoritative by combining some valuable literature after conducting systematic experiments...
July 26, 2018: Ultrasonics Sonochemistry
Aashima, Satish Kumar Pandey, Suman Singh, S K Mehta
Gadolinium oxide nanoparticles (GdO) have recently gained attention due to their diverse bio-applications. However, their functionalization with amino acids has not been reported yet to the best of our knowledge. In the present report, the potential of sonication technique (for the first time to the best of our knowledge) in the fabrication of GdO nanoparticles was explored. Sonication is an efficient technique for the synthesis of evenly dispersing nanoparticles in liquids thus, the present report highlights the use of ultrasonication technique for the fabrication of uniform 2 nm sized luminescent l-lysine coated gadolinium oxide nanoparticles (l-lysine@GdO)...
July 26, 2018: Ultrasonics Sonochemistry
Jongbok Choi, Jeehyeong Khim, Bernaurdshaw Neppolian, Younggyu Son
The effect of air sparging on sonochemical oxidation reactions was investigated using a relatively large reactor equipped with a 36 kHz transducer module at the bottom. KI dosimetry and luminol techniques were used for quantitative and qualitative analysis of the reactions. The cavitation yield increased and then varied minimally as the liquid height increased from 1λ (42 mm) to 8λ (333 mm) with no air sparging. The flow rate of the air used for sparging and the position of the sparger significantly affected the extent of the sonochemical oxidation reactions...
July 24, 2018: Ultrasonics Sonochemistry
Swapnil N Mane, Sagar M Gadalkar, Virendra K Rathod
Paracetamol (acetaminophen) is one of the most frequently used analgesic and antipyretic drugs. This work deals with ultrasound assisted synthesis (UAS) of paracetamol from hydroquinone using ammonium acetate as an amidating agent. The optimization of various reaction and ultrasound parameters was performed to minimize the energy and time requirement. UAS of paracetamol was achieved at a lower temperature (60 °C) and the time (150 min) without formation of salt as a byproduct, making reaction green and inherently safer...
July 23, 2018: Ultrasonics Sonochemistry
Yoshihiro Kojima, Miyako Takayasu, Maricella Toma, Shinobu Koda
Ultrasonic degradation of cellulose with low molecular weight in NaOH and NaOH/urea solutions was investigated at 20 and 500 kHz frequencies by measuring the solution viscosity. The viscosity decreased with sonication time. A small difference in viscosity ratio which is defined as the ratio of specific viscosity of solution after and before sonication was observed for the longer sonication. The degrees of the polymerization were reduced from 230 to 150 for 30 min sonication at 20 kHz and for 120 min sonication at 500 kHz...
July 23, 2018: Ultrasonics Sonochemistry
Dongxin Yang, Zhengyang Ni, Yanye Yang, Guangyao Xu, Juan Tu, Xiasheng Guo, Pintong Huang, Dong Zhang
High intensity focused ultrasound (HIFU) has been regarded as a promising technology for treating cancer and other severe diseases noninvasively. In the present study, dual modality magnetic ultrasound contrast agent microbubbles (MBs) were synthesized by loading the super paramagnetic iron oxide nanoparticles (SPIOs) into the albumin-shelled MBs (referred as SPIO-albumin MBs). Then, both experimental measurements and numerical simulations were performed to evaluate the ability of SPIO-albumin MBs of enhancing HIFU-induced thermal effect...
July 23, 2018: Ultrasonics Sonochemistry
Pengfei Wu, Lixin Bai, Weijun Lin, Xiuming Wang
Bubble clusters in hydrodynamic cavitation, acoustic cavitation and hydrodynamic-acoustic cavitation (HAC) are investigated via high-speed photography. By introducing a cavitation state variable, a method for cavitation characterization is proposed. The periodic characteristics and intensity distributions of hydrodynamic cavitation, acoustic cavitation and HAC are quantitatively analyzed using this method. It is found that the range of HAC is evidently widened and the strength of HAC is significantly enhanced compared with hydrodynamic cavitation or acoustic cavitation...
July 21, 2018: Ultrasonics Sonochemistry
Hemant Kumar, Vimal Kumar
An energy efficient and scalable method designed to form stable and transparent water-in-oil (W/O) nanoemulsion can be attained by optimization of process parameters and study of ternary diagram. Application of high energy in addition to the low energy at the optimized conditions have been targeted to make the process energy efficient, since later part is applied to droplets formed at less energy. In the present work, formation of combined energy mixed surfactant nanoemulsion was achieved by combined approach of isothermal low energy followed by ultrasonication that could be used as a fuel in compression ignition engine free from NOx and particulate matter emissions...
July 21, 2018: Ultrasonics Sonochemistry
Guoxia Fei, Xiaoxue Pu, Guo Li, Zhanhua Wang, Hesheng Xia
High-intensity Focused Ultrasound (HIFU) was used to stimulate the embedded copper sulfate (CuSO4 ) particles to release from the crosslinked poly (methyl methacrylate-co-butyl acrylate) copolymer solid matrix. In order to better understand the ultrasound release mechanism for drug/polymer delivery systems, the synchrotron radiation X-ray computed microtomography (SR-CT) was used to non-destructively investigate the structure of drug/polymer delivery systems after different HIFU treatment time. For the first time, we clearly demonstrate that ultrasonic waves can overcome the constraints of the polymer chain and drive the filler to move from the strong region to the weak region in the solid polymer matrix, thus resulting in a change in distribution of the filler in solid polymers...
July 20, 2018: Ultrasonics Sonochemistry
Daria V Andreeva, Pavel V Cherepanov, Y S Avadhut, Jürgen Senker
Progress in understanding of energy transfer in nature and human being requires novel approaches to the processing of solids on demand, in specially those with composition gradients and those thermodynamically and kinetically inaccessible. We demonstrate that rapidly oscillating microbubbles are useful for materials processing, because they manipulate surface temperature and creates temperature gradients in predictable way. Ultrasonic treatment leads to an increase in the surface area of particles up to 180 m2 g-1 and the formation of micropores in metal phase and mesopores in metal oxide phase...
July 19, 2018: Ultrasonics Sonochemistry
S Shabana, R Prasansha, I Kalinina, I Potoroko, U Bagale, S H Shirish
Starch is second most abundant biomaterial available after cellulose but the intensity of research on starch is less compared to cellulose. It is a carbohydrate based polymer synthesized in plants for the storage of the energy. Major percentage of starch is being utilized by food industries as raw material for giving texture, flavor, gelling, fat replacement etc. and also has multiple applications in different area due to its biological origin and properties. Native starch possesses low shear stress, poor thermal properties and less digestion resistance and retro-gradation...
July 19, 2018: Ultrasonics Sonochemistry
Yuan Yao, Mingxuan Sun, Xiaojiao Yuan, Yuanhua Zhu, Xiaojing Lin, Sambandam Anandan
N/Ti3+ co-doping multiphasic TiO2 /BiOBr heterojunctions (NT-TBx) were prepared by one-step in situ hydrothermal processes. The crystal phase, morphology, component, and optical properties of the heterojunctions were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, and Ultraviolet-visible diffuse reflectance spectroscopy techniques, respectively. The as-prepared samples exhibit better sonocatalytic activity for the degradation methylene blue, Rhodamine B, and p-Nitrophenol aqueous solution compared with pristine TiO2 and N/Ti3+ co-doping multiphasic TiO2 ...
July 19, 2018: Ultrasonics Sonochemistry
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