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Ultrasonics Sonochemistry

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https://www.readbyqxmd.com/read/28733022/preparation-and-sonophotocatalytic-performance-of-hierarchical-bi2wo6-structures-and-effects-of-various-factors-on-the-rate-of-rhodamine-b-degradation
#1
Liuying Liang, Yalkunjan Tursun, Aisha Nulahong, Talifu Dilinuer, Awuti Tunishaguli, Ge Gao, Abulizi Abulikemu, Kenji Okitsu
Hierarchical Bi2WO6 structures with high surface area were prepared in the presence of polyvinylpyrrolidone by using an optimized hydrothermal method. The samples prepared were characterized by X-ray diffraction, field-emission scanning electron microscopy and N2 adsorption-desorption technique. The results of these characterizations showed the formation of the hierarchical Bi2WO6 structures with high surface area (51m(2)/g). The degradation of Rhodamine B (RhB) with or without visible light was investigated under various experimental conditions to evaluate the sonophotocatalytic activity of the hierarchical Bi2WO6 structures...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733021/sonochemical-synthesis-and-structural-characterization-of-a-new-nanostructured-co-ii-supramolecular-coordination-polymer-with-lewis-base-sites-as-a-new-catalyst-for-knoevenagel-condensation
#2
Monika Joharian, Sedigheh Abedi, Ali Morsali
A new Co(II) mixed-ligand coordination supramolecular polymer with composition [Co2(ppda)(4-bpdh)2(NO3)2]n (1) (where, ppda=p-phenylenediacrylic acid, 4-bpdh=2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) was synthesized using solvothermal, mechanochemical and sonochemical methods. Compound 1 and the new nanostructure have been characterized by single-crystal X-ray, infrared spectroscopy (IR), powder X-ray diffraction (PXRD) analysis and scanning electron microscopy (SEM). The thermal stability of compound 1 was also studied by thermal gravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733020/sonolysis-and-sono-fenton-oxidation-for-removal-of-ibuprofen-in-waste-water
#3
Sandyanto Adityosulindro, Laurie Barthe, Katia González-Labrada, Ulises Javier Jáuregui Haza, Henri Delmas, Carine Julcour
Two sonochemical processes were compared for the removal of ibuprofen in different water matrixes (distilled water and effluent from wastewater treatment plant). The effect of various operating parameters, such as pH (2.6-8.0), ultrasound power density (25-100W/L), sonication frequency (12-862kHz), addition of radical promoters (H2O2 and Fenton's reagent) or scavengers (n-butanol and acetic acid), was evaluated. Sono-degradation of ibuprofen followed a first-order kinetic trend, whose rate constant increased with ultrasound density and frequency...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733019/sonochemical-synthesis-of-hydrogenated-amorphous-silicon-nanoparticles-from-liquid-trisilane-at-ambient-temperature-and-pressure
#4
Andrew P Cádiz Bedini, Benjamin Klingebiel, Martina Luysberg, Reinhard Carius
Silicon nanoparticles (Si-NPs) are increasing in relevance in diverse fields of scientific and nanotechnological inquiry, where currently some of the most important areas of research involve energy storage and biomedical applications. The present article is concerned with a curious and scalable method for the preparation of discrete, unoxidized, hydrogenated, and amorphous Si-NPs of tunable size in the range of 1.5-50nm. Using ultrasound generated with a conventional ultrasonic horn, the "fusion" of Si-NPs is demonstrated at ambient temperature and pressure by sonicating solutions containing readily available, semiconductor-grade purity trisilane (Si3H8)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733018/sono-assisted-preparation-of-bio-nanocomposite-for-removal-of-pb-2-ions-study-of-morphology-thermal-and-wettability-properties
#5
Shadpour Mallakpour, Vajiheh Behranvand
Multi-walled carbon nanotubes (MWCNT) loaded poly(ethylene terephthalate) (PET) composites, with different CNT contents, were fabricated through an ultrasound assisted method as a fast and green way. Then, the obtained composites were fully characterized via FT-IR, UV-Vis, XRD, TGA, FE-SEM and TEM, etc. For this purpose, PET bottle was recycled and applied as matrix of nanocomposites (NC)s. Then, we dispersed the covalent functionalization of MWCNTs with a protein dispersant and obtained a powder of protein-functionalized CNTs...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733017/combined-sonochemical-and-short-wavelength-uv-degradation-of-hydrophobic-perfluorinated-compounds
#6
Kazuhiko Sekiguchi, Takahisa Kudo, Kenshi Sankoda
Perfluorochemicals (PFCs), which are common in the aquatic environment, are toxic substances that have high chemical and heat resistance because of their strong C-F bonds. We investigated the effect of ultrasonication and short-wavelength UV irradiation on the degradation of perfluorooctane, perfluoropropionic acid, and perfluorooctanoic acid, which are examples of hydrophobic, hydrophilic, and intermediate PFCs, respectively. The results confirmed that ultrasonication was more effective for decomposing hydrophobic PFCs and UV irradiation was more effective for decomposing hydrophilic PFCs...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733016/interaction-between-cavitation-microbubble-and-cell-a-simulation-of-sonoporation-using-boundary-element-method-bem
#7
Xiasheng Guo, Chenliang Cai, Guangyao Xu, Yanye Yang, Juan Tu, PinTong Huang, Dong Zhang
Sonoporation has been widely accepted as a significant tool for gene delivery as well as some bio-effects like hemolysis, bringing in high demands of looking into its underlying mechanism. A two-dimensional (2D) boundary element method (BEM) model was developed to investigate microbubble-cell interaction, especially the morphological and mechanical characteristics around the close-to-bubble point (CP) on cell membrane. Based on time evolution analysis of sonoporation, detailed information was extracted from the model for analysis, including volume expansion ratio of the bubble, areal expansion ratio of the cell, jet velocity and CP displacement...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733015/ultrasonic-assisted-synthesis-of-polyvinyl-alcohol-phytic-acid-polymer-film-and-its-thermal-stability-mechanical-properties-and-surface-resistivity
#8
Jihui Li, Yongshen Li, Yunna Song, Shuai Niu, Ning Li
In this paper, polyvinyl alcohol/phytic acid polymer (PVA/PA polymer) was synthesized through esterification reaction of PVA and PA in the case of acidity and ultrasound irradiation and characterized, and PVA/PA polymer film was prepared by PVA/PA polymer and characterized, and the influence of dosage of PA on the thermal stability, mechanical properties and surface resistivity of PVA/PA polymer film were researched, and the influence of sonication time on the mechanical properties of PVA/PA polymer film was investigated...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733014/removal-of-congo-red-dye-from-aqueous-solution-with-nickel-based-metal-organic-framework-graphene-oxide-composites-prepared-by-ultrasonic-wave-assisted-ball-milling
#9
Shuaiqi Zhao, Ding Chen, Fuhua Wei, Nini Chen, Zhao Liang, Yun Luo
Metal-organic frameworks (MOFs) were successfully synthesized by ultrasonic wave-assisted ball milling. In the absence of organic solvent, the coupling effect of ultrasonic wave and mechanical force played an significant role in the synthesis of MOFs. Adsorption of Congo red (CR) was studied in view of adsorption kinetic, isotherm and thermodynamics. The adsorbent was carried out using X-ray diffraction (XRD), thermogravimetric analysis (TGA), N2 adsorption-desorption isotherms, Raman spectroscopy and scanning electron microscope (SEM) methods...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733013/photoluminescence-electrochemical-behavior-and-photocatalytic-activities-of-cobalt-ii-coordination-polymer-nanostructures-synthesized-by-sonochemical-process
#10
Jing-Wang Cui, Yue-Hua Li, Ling-Yan Zhao, Guang-Hua Cui
Nanostructures of a new Co(II) coordination polymer (CP), [Co(Hbibp)(nbta)]n (1), (bibp=4,4'-bis(1-imidazolyl)biphenyl, H3nbta=5-nitro-1,2,3-benzenetricarboxylic acid) was synthesized by a sonochemical method. The nano-sized CP 1 was characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction and scanning electron microscopy (SEM). Structural analysis show that CP 1 exhibits a 1D chain structure with a 3-connected SP 1-periodic net (4,4)(0,2) topology, which can be further extended into a 2D supramolecular layer by the NH⋯O hydrogen bond interactions...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733012/ultrasound-promoted-copper-catalyzed-synthesis-of-bis-arylselanyl-chrysin-derivatives-with-boosted-antioxidant-and-anticancer-activities
#11
Sergio F Fonseca, Nathalia B Padilha, Samuel Thurow, Juliano A Roehrs, Lucielli Savegnago, Maurice N de Souza, Mariana G Fronza, Tiago Collares, Julieti Buss, Fabiana K Seixas, Diego Alves, Eder J Lenardão
Herein we report the use of ultrasonic irradiation (US) in the synthesis of six new semi-synthetic selenium-containing chrysin derivatives by a simple and effective methodology utilizing CuI as catalyst, in good to excellent yields (60-89%). It was observed that US accelerates the reaction compared to conventional heating with excellent selectivity for diselenylated products. Compounds were tested for their antioxidant and anticancer activities in vitro and it was observed that the presence of selenium in the A-ring of chrysin enhanced both antioxidant and anticancer properties...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733011/rapid-preparation-of-high-electrochemical-performance-lifepo4-c-composite-cathode-material-with-an-ultrasonic-intensified-micro-impinging-jetting-reactor
#12
Bin Dong, Xiani Huang, Xiaogang Yang, Guang Li, Lan Xia, George Chen
A joint chemical reactor system referred to as an ultrasonic-intensified micro-impinging jetting reactor (UIJR), which possesses the feature of fast micro-mixing, was proposed and has been employed for rapid preparation of FePO4 particles that are amalgamated by nanoscale primary crystals. As one of the important precursors for the fabrication of lithium iron phosphate cathode, the properties of FePO4 nano particles significantly affect the performance of the lithium iron phosphate cathode. Thus, the effects of joint use of impinging stream and ultrasonic irradiation on the formation of mesoporous structure of FePO4 nano precursor particles and the electrochemical properties of amalgamated LiFePO4/C have been investigated...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733010/effects-of-high-intensity-ultrasound-on-acid-induced-gelation-properties-of-whey-protein-gel
#13
Xue Shen, Changhui Zhao, Mingruo Guo
Pre-heated whey protein isolate (WPI) solution (10% w/v, 85°C for 30min) was prepared and subjected to high-intensity ultrasound (HUS, 20kHz) at different durations (5-40min) before acidification to determine the effects of HUS on glucono-δ-lactone (GDL)-induced gelation properties of whey protein gel. Results showed that HUS reduced the particle size and increased surface free sulfhydryl groups of pre-heated whey protein solution. Free sulfhydryl (-SH) content of the acid-induced WPI gels (GIWG) and protein solubility in presence of 8M urea were significantly reduced (P<0...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733009/design-of-a-new-technique-based-on-combination-of-ultrasound-waves-via-magnetite-solid-phase-and-cloud-point-microextraction-for-determination-of-cr-iii-ions
#14
Shadi Kheirandish, Mehrorang Ghaedi, Kheibar Dashtian, Faezeh Pourebrahim
In this work, we focused on development of a new techniques by coupling of ultrasound irradiation, cloud point method and magnetite solid phase microextraction for the extraction and preconcentration of Cr(III) ions from aqueous solutions. In order to reduce cost and improve practicability of proposed process a new efficient and regenerable magnetite sorbent (functionalized chitosan grafted-amino graphene oxide (GO) decorated by zinc ferrite nanoparticles (CS-GO-Zn: Fe2O4)) was synthesized through hydrothermal method and then characterized by FT-IR, FE-SEM, EDS and XRD analysis...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733008/highly-transparent-cerium-doped-gadolinium-gallium-aluminum-garnet-ceramic-prepared-with-precursors-fabricated-by-ultrasonic-enhanced-chemical-co-precipitation
#15
Ji-Yun Zhang, Zhao-Hua Luo, Hao-Chuan Jiang, Jun Jiang, Chun-Hua Chen, Jing-Xian Zhang, Zhen-Zhen Gui, Na Xiao
Cerium doped gadolinium gallium aluminum garnet (GGAG:Ce) ceramic precursors have been synthesized with an ultrasonic chemical co-precipitation method (UCC) and for comparison with a traditional chemical co-precipitation method (TCC). The effect of ultra-sonication on the morphology of powders and the transmittance of GGAG:Ce ceramics are studied. The results indicate that the UCC method can effectively improve the homogenization and sinterability of GGAG:Ce powders, which contribute to obtain high transparent GGAG ceramic with the highest transmittance of 81%...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733007/ultrasound-assisted-synthesis-of-poly-mma-co-ba-zno-nanocomposites-with-enhanced-physical-properties
#16
Maneesh Kumar Poddar, Sachin Sharma, Srinivas Pattipaka, D Pamu, Vijayanand S Moholkar
The present study reports synthesis and characterization of poly(MMA-co-BA)/ZnO nanocomposites using ultrasound-assisted in-situ emulsion polymerization. Methyl methacrylate (MMA) was copolymerized with butyl acrylate (BA), for enhanced ductility of copolymer matrix, in presence of nanoscale ZnO particles. Ultrasound generated strong micro-turbulence in reaction mixture, which resulted in higher encapsulation and uniform dispersion of ZnO (in native form - without surface modification) in polymer matrix, as compared to mechanical stirring...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733006/physical-and-chemical-mechanism-underlying-ultrasonically-enhanced-hydrochloric-acid-leaching-of-non-oxidative-roasting-of-bastnaesite
#17
Dongliang Zhang, Mei Li, Kai Gao, Jianfei Li, Yujun Yan, Xingyu Liu
In this study, we investigated an alternative to the conventional hydrochloric acid leaching of roasted bastnaesite. The studies suggested that the rare earth oxyfluorides in non-oxidatively roasted bastnaesite can be selectively leached only at elevated temperatures Further, the Ce(IV) in oxidatively roasted bastnaesite does not leach readily at low temperatures, and it is difficult to induce it to form a complex with F(-) ions in order to increase the leaching efficiency. Moreover, it is inevitably reduced to Ce(III) at elevated temperatures...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733005/ultrasonic-cavitation-erosion-of-316l-steel-weld-joint-in-liquid-pb-bi-eutectic-alloy-at-550%C3%A2-c
#18
Yucheng Lei, Hongxia Chang, Xiaokai Guo, Tianqing Li, Longren Xiao
Liquid lead-bismuth eutectic alloy (LBE) is applied in the Accelerator Driven transmutation System (ADS) as the high-power spallation neutron targets and coolant. A 19.2kHz ultrasonic device was deployed in liquid LBE at 550°C to induce short and long period cavitation erosion damage on the surface of weld joint, SEM and Atomic force microscopy (AFM) were used to map out the surface properties, and Energy Dispersive Spectrometer (EDS) was applied to the qualitative and quantitative analysis of elements in the micro region of the surface...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733004/study-on-thermal-mechanical-and-adsorption-properties-of-amine-functionalized-mcm-41-pmma-and-mcm-41-ps-nanocomposites-prepared-by-ultrasonic-irradiation
#19
Gholamhossein Mohammadnezhad, Saeed Abad, Roozbeh Soltani, Mohammad Dinari
In this study, two common industrial polymers, poly(methyl methacrylate) (PMMA) and polystyrene (PS), were incorporated into amine-functionalized MCM-41 mesoporous silica as reinforcement agents via an ultrasonic assisted method as a facile, fast, eco-friendly, and versatile synthetic tool. Amino functionalization of MCM-41 were performed by 3-aminopropyl triethoxysilane as a coupling agent and it is denoted as APTS-MCM-41. The obtained nanocomposites (NCs), APTS-MCM-41/PMMA and APTS-MCM-41/PS, were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM), and thermogravimetric analysis (TGA)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28733003/interactions-at-the-planar-ag3sn-liquid-sn-interface-under-ultrasonic-irradiation
#20
Huakai Shao, Aiping Wu, Yudian Bao, Yue Zhao, Lei Liu, Guisheng Zou
The interactions at the interface between planar Ag3Sn and liquid Sn under ultrasonic irradiation were investigated. An intensive thermal grooving process occurred at Ag3Sn grain boundaries due to ultrasonic effects. Without ultrasonic application, planar shape of Ag3Sn layer gradually evolved into scalloped morphology after the solid-state Sn melting, due to a preferential dissolution of the intermetallic compounds from the regions at grain boundaries, which left behind the grooves embedding in the Ag3Sn layer...
November 2017: Ultrasonics Sonochemistry
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