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Or Perlman, Iris S Weitz, Sarit Sivan, Hiba Abu-Khalla, Madeleine Benguigui, Yuval Shaked, Haim Azhari
Copper oxide nanoparticles (CuO-NPs) are increasingly investigated for diagnostic and therapeutic purposes. Recent work have demonstrated their anticancer potential as well as contrast agent capabilities for magnetic resonance imaging (MRI) and through-transmission ultrasound. However, no capabilities of CuO-NPS were demonstrated using conventional ultrasound systems, which, unlike the formers, are widely deployed in the clinic. Furthermore, in spite of their potential as multifunctional nano-based materials for diagnosis and therapy, CuO-NPs were delayed from further clinical translation due to their inherent toxicity...
February 16, 2018: Nanotechnology
Lidia Morelli, Laura Serioli, Francesca Alessandra Centorbi, Christian Bille Jendresen, Marco Matteucci, Oleksii Ilchenko, Danilo Demarchi, Alex Toftgaard Nielsen, Kinga Zór, Anja Boisen
We present the development of an automated centrifugal microfluidic platform with integrated sample pre-treatment (filtration and liquid-liquid extraction) and detection (SERS-based sensing). The platform consists of eight calibration and four assay modules, fabricated with polypropylene using injection molding and bonded with ultrasonic welding. The platform was used for detection of a secondary bacterial metabolite (p-coumaric acid) from bacterial supernatant. The obtained extraction efficiency was comparable to values obtained in batch experiments and the SERS-based sensing showed a good correlation with HPLC analysis...
February 16, 2018: Lab on a Chip
Qingbai Jiang, Bo Liang, Siqi Tang, Xu Chen
Porous polymer electrolytes (PPEs) doped with nano-Al2O3 were prepared by a joint application of ultrasonic treatment and control evaporation in vacuum oven. The morphology, pore size distribution, thermal, electrochemical and mechanical properties of the PPEs were investigated. The porosity distribution of PPEs was uniform and their pore size was relatively modest. The total resistance (Rt) of PPEs with 10% Al2O3 is only 9 Ω at 80 °C. The maximum tensile strength of the PPEs membranes reached to 24.43 MPa...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Jila Talat, Mohammad Sabzi, Behrouz Safibonab, Iraj Hasanzadeh, Ali Arman, Isa Karimzadeh
The aim of this work was to prepare strong and conductive polyurethane acrylate nanocomposites. First, urethane prepolymers with different molecular weights and hydrophilicities were synthetized. Then, their corresponding polyurethane acrylate nanocomposites were prepared by ultrasonically-assisted emulsion polymerization in the presence of various ratios of urethane prepolymers and acrylate monomers. Thermogravimetric analysis (TGA) and tensile results showed that thermal stability and mechanical properties of polyurethane acrylate samples are significantly dependent on the molecular weight and hydrophilicity of the urethane prepolymer as well as the content of acrylate monomers...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Madhab Bera, Pragya Gupta, Pradip K Maji
Facile one pot synthesis of graphene oxide (GO) by sonication assisted mechanochemical approach has been reported here. The amalgamation of ultrasonication and mechanical stirring has assisted the synthesis of GO in a short time duration of only 4 hours with good reaction yield. The structural characterization of GO was performed by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Visible spectroscopy and Raman spectroscopy. Atomic force microscopic (AFM) analysis manifested the flake like morphology of GO with average sheet thickness ~1...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Richard Nauber, Lars Büttner, Kerstin Eckert, Jochen Fröhlich, Jürgen Czarske, Sascha Heitkam
The flow field of moving foams is relevant for basic research and for the optimization of industrial processes such as froth flotation. However, no adequate measurement technique exists for the local velocity distribution inside the foam bulk. We have investigated the ultrasound Doppler velocimetry (UDV), providing the first two-dimensional, non-invasive velocity measurement technique with an adequate spatial (10mm) and temporal resolution (2.5Hz) that is applicable to medium scale foam flows. The measurement object is dry aqueous foam flowing upward in a rectangular channel...
January 2018: Physical Review. E
Bevis Hutchinson, Mikael Malmström, Johan Lönnqvist, Pete Bate, Hossein Ehteshami, Pavel A Korzhavyi
High temperature crystal elasticity constants for face centred cubic austenite are important for interpreting the ultrasonic properties of iron and steels but cannot be determined by normal single crystal methods. Values of these constants have recently been calculated using an ab-initio approach and the present work was carried out to test their applicability using laser-ultrasonic measurements. Steel samples having a known texture were examined at temperatures between 800 °C and 1100 °C to measure the velocity of longitudinal P-waves which were found to be in good agreement with modelled values...
February 8, 2018: Ultrasonics
Reza Abazari, Ali Reza Mahjoub
A visible light-driven amine-functionalized Al-based MOF # @ y x Sm 2 O 3 -ZnO nanocomposite (NH 2 -MOF # @ y x Sm 2 O 3 -ZnO NCP) was synthesized as an effective photocatalyst for AMX degradation in the presence of ultrasound, in which # is MOF synthesis conditions from MOF I to MOF XII and x and y stand for the weight percentages of Sm 2 O 3 -to-ZnO and Sm 2 O 3 -ZnO-to-MOF, respectively. The β-lactam antibiotic AMX, which is widely used for treating Gram-positive and Gram-negative bacterial infections in both animals and humans, was employed as a model pollutant...
February 15, 2018: Inorganic Chemistry
Jicheng Feng, Dong Chen, Ahmad Sediq, Stefan Romeijn, Frans D Tichelaar, Wim Jiskoot, Jun Yang, Marc T M Koper
A key enabling step in leveraging the properties of nanoparticles (NPs) is to explore new, simple, controllable, and scalable nanotechnologies for their syntheses. Among 'wet' methods, cathodic corrosion has been used to synthesize catalytic aggre-gates with some control over their size and preferential faceting. Here, we report on a modification of the cathodic corrosion method for producing a range of non-aggregated nanocrystals (Pt, Pd, Au, Ag, Cu, Rh, Ir, Ni) and nanoalloys (Pt50Au50, Pd50Au50, AgxAu100-x) with potential for scaling up the production rate...
February 15, 2018: ACS Applied Materials & Interfaces
Xu Shen, Min Zhang, Bhesh Bhandari, Zhimei Guo
BACKGROUND: In order to investigate ultrasound dielectric pretreatment effect on oxidation resistance of vacuum fried apple chips, apple slices were pretreated at ultrasonic power for 150, 250 and 400 W and time for 10, 20 and, 30 min, followed by vacuum frying (VF) . The quality and oxidation resistance of fried apple were evaluated by testing the dielectric properties and comparing moisture content, oil uptake, color, acid value (AV) and peroxide value (PV) of apple chips. RESULTS: Ultrasonic treatment can significantly change dielectric properties of apple slices...
February 15, 2018: Journal of the Science of Food and Agriculture
Nadine Schaefer, Ann-Katrin Kroll, Matthias W Laschke, Michael D Menger, Hans H Maurer, Markus R Meyer, Peter H Schmidt
BACKGROUND: Since their appearance on the drugs of abuse market, synthetic cannabinoids (SCs) are gaining increasing toxicological relevance. They are consumed without knowledge of their toxicokinetic (TK) and toxicodynamic properties and human studies are not allowed due to ethical reasons. A controlled animal TK study following nebulization of 4-ethylnaphthalene-1-yl-(1-pentylindole-3-yl)methanone (JWH-210), 2-(4-methoxyphenyl)-1-(1-pentyl-indole-3-yl)methanone (RCS-4) as well as Δ9-tetrahydrocannabinol (THC) to pigs should be helpful for better interpretation of analytical results in cases of misuse or poisoning...
February 14, 2018: Current Drug Delivery
Eiki Kimura, Chiharu Tohyama
Mammalian attachment behaviors, such as crying, are essential for infant survival by receiving food, protection, and warmth from caregivers. Ultrasonic vocalization (USV) of infant rodents functions to promote maternal proximity. Impaired USV emission has been reported in mouse models of autism spectrum disorder, suggesting that USV is associated with higher brain function. In utero and lactational dioxin exposure is known to induce higher brain function abnormalities in adulthood; however, whether perinatal dioxin exposure affects behavior during infancy is unclear...
February 14, 2018: Archives of Toxicology
Daphné Capela, Carlos Dombret, Kevin Poissenot, Manon Poignant, Aude Malbert-Colas, Isabelle Franceschini, Matthieu Keller, Sakina Mhaouty-Kodja
The neural circuitry processing male sexual behavior is tightly regulated by testosterone and its neural metabolite estradiol. The present study evaluated the effects of adult exposure to low doses of nonylphenol (NP), a widespread environmental contaminant, on the neuroendocrine regulation of testosterone and expression of sexual behavior. Oral exposure of C57BL/6J males to NP (0.5, 5 or 50 μg/kg/day) for 4 weeks did not affect circulating levels of testosterone or the kisspeptin system, a key regulator of the gonadotropic axis...
February 14, 2018: Scientific Reports
Naoto Katakami, Tomoya Mita, Masahiko Gosho, Mitsuyoshi Takahara, Yoko Irie, Tetsuyuki Yasuda, Taka-Aki Matsuoka, Takeshi Osonoi, Hirotaka Watada, Iichiro Shimomura
AIM: It remains unclear whether measures used in carotid ultrasonography such as the intima-media thickness (IMT) and ultrasonic tissue characterization of the carotid using the gray-scale median (GSM) can add prognostic information beyond the conventional cardiovascular risk markers in patients with diabetes. METHODS: This study employed a combined analysis of data obtained in five longitudinal studies including a total of 3263 patients with diabetes but without apparent cardiovascular disease (CVD) at baseline...
February 14, 2018: Journal of Atherosclerosis and Thrombosis
Xiaowei Liu, Terence T W Wong, Junhui Shi, Jun Ma, Qing Yang, Lihong V Wang
Photoacoustic microscopy (PAM) with ultraviolet (UV) laser illumination has recently been demonstrated as a promising tool that provides fast, label-free, and multilayered histologic imaging of human breast tissue. Thus far, the axial resolution has been determined ultrasonically. To enable optically defined axial resolution, we exploit the Grüneisen relaxation (GR) effect. By imaging mouse brain slices, we show that GRUV-PAM reveals detailed information about three-dimensional cell nuclear distributions and internal structures, which are important diagnostic features for cancers...
February 15, 2018: Optics Letters
Zhengwei Luo, Min Zhu, Mulin Guo, Zhouyang Lian, Wen Tong, Jirong Wang, Binghua Zhang, Wuji Wei
The activity inhibition of fungi by ZnO nanoparticles (NPs) has shown huge potential applications in the area of hygienic coatings. However, the inhibition efficiency was limited due to the agglomeration of NPs. To obtain well-dispersed and highly stabilized ZnO nanofluids, ZnO NPs were capped with four kinds of surfactants under ultrasonication. The capping procedure was optimized by varying the dosage of surfactants, the ultrasonic duration, ultrasonic power and temperature. Capped ZnO nanofluids were then used for the inhibition of Trichoderma viride...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Rajeev Kr Sharma, Rajesh Kumar, Anirudh P Singh
Herein, we report a greener, total chlorine free, ultrasonic physicochemical process of extraction and purification of cellulose micro-whiskers from rice husk. The initial step involves the treatment of the rice husk with a concentrated aqueous alkali solution for the duration of 6 h at 80 °C in round bottom flask in order to completely dissolve lignin and silica. After alkali pretreatment, the product obtained was thoroughly washed with distilled water, filtered and dried. The dried product was subjected to mechanical treatment followed by a bleaching process...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Andrew J Stollenwerk, Eric Clausen, Matthew Cook, Keith Doore, Ryan Holzapfel, Jacob Weber, Rui He, Timothy E Kidd
Ultrasonic agitation is a proven method for breaking down layered materials such as MoS2 into single or few layer nanoparticles. In this experiment, MoS2 powder is sonicated in isopropanol for an extended period of time in an attempt to create particles of the smallest possible size. As expected, the process yielded a significant quantity of nanoscale MoS2 in the form of finite layer sheets with lateral dimensions as small as a few tens of nanometers. Although no evidence was found to indicate a larger the longer sonication times resulted in a significant increase in yield of single layer MoS2, the increased sonication did result in the formation of several types of carbon allotropes in addition to the sheets of MoS2...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Feng Zhang, Tian-Yu Liu, Gui-Hua Hou, Rong-Feng Guan, Jun-Hao Zhang
The fast development of solid-liquid phase change materials calls for nanomaterials with large specific surface area for rapid heat transfer and encapsulation of phase change materials to prevent potential leakage. Here we report a combined miniemulsion/emulsion polymerization method to prepare poly(styrene-co-acrylic acid)-encapsulated paraffin (paraffin@P(St-co-AA)) nanocapsules. The method could suppress the shortcomings of common miniemulsion polymerization (such as evaporation of monomer and decomposition of initiator during ultrasonication)...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Pan Yang, Zi-Jun Hu, Hong Lin, Xin-Chun Lai, Xiao-Chong Zhao, Li-Jun Yang
Low-cost carbon materials (carbon black and graphite power) were applied as substitution of platinum (Pt) in counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). Three fabrication methods, such as ball-milled, pulp-refined, and ultrasonic-crushed, were applied to remove the particle aggregation in the carbon pastes. Then the carbon based pastes were printed on fluorine-doped transparent conducting oxide (FTO) glasses, used as the CEs for DSSCs. Under illumination of 100 mW/cm2, DSSCs with ultrasonic-crushed CEs (U-CEs) show an energy conversion efficiency of 3...
June 1, 2018: Journal of Nanoscience and Nanotechnology
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