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Synthesis of nanoparticles

Abhilash Samykutty, William E Grizzle, Benjamin L Fouts, Molly W McNally, Phillip Chuong, Alexandra Thomas, Akiko Chiba, Dennis Otali, Anna Woloszynska, Neveen Said, Peter J Frederick, Jacek Jasinski, Jie Liu, Lacey R McNally
At the intersection of the newly emerging fields of optoacoustic imaging and theranostic nanomedicine, promising clinical progress can be made in dismal prognosis of ovarian cancer. An acidic pH targeted wormhole mesoporous silica nanoparticle (V7-RUBY) was developed to serve as a novel tumor specific theranostic nanoparticle detectable using multispectral optoacoustic tomographic (MSOT) imaging. We report the synthesis of a small, < 40 nm, biocompatible asymmetric wormhole pore mesoporous silica core particle that has both large loading capacity and favorable release kinetics combined with tumor-specific targeting and gatekeeping...
August 4, 2018: Biomaterials
Valentina Rey, Marcelo E Gramajo Feijoo, Rodrigo E Giménez, María E Tuttolomondo, Faustino E Morán Vieyra, Marcelo C Sosa Morales, Claudio D Borsarelli
A fast and single-step procedure is reported for the preparation of stable solutions of spherical-shaped silver nanoparticles (AgNPs) coated with lysozyme (LZ). The preparation of the AgNP@LZ nanocomposites was based on the reduction of Ag+ with ketyl radicals photo-generated by the UVA-photolysis of the benzoin I-2959. Both reaction precursors bind to LZ, modifying its superficial charge and conformational structure. The photo-induced kinetics of formation of the AgNPs as a function of the LZ concentration was monitored in-situ by UV-vis absorption spectroscopy...
August 10, 2018: Colloids and Surfaces. B, Biointerfaces
Cheng Zhang, Shehzahdi Shebbrin Moonshi, Wenqian Wang, Hang Thu Ta, Yanxiao Han, Felicity Y Han, Hui Peng, Petr Král, Barbara E Rolfe, John Justin Gooding, Katharina Gaus, Andrew Keith Whittaker
Two important challenges in the field of 19F magnetic resonance imaging (MRI) are the maintenance of high fluorine content without compromising imaging performance, and effective targeting of small particles to diseased tissue. To address these challenges, we have developed a series of perfluoropolyether (PFPE)-based hyperbranched (HBPFPE) nanoparticles with attached peptide aptamer as targeting ligands for specific in vivo detection of breast cancer with high 19F MRI sensitivity. A detailed comparison of the HBPFPE nanoparticles (NPs) with the previously reported trifluoroethyl acrylate (TFEA)-based polymers demonstrates that the mobility of fluorinated segments of the HBPFPE nanoparticles is significantly enhanced (19F T2 > 80 ms vs...
August 17, 2018: ACS Nano
Takeshi Kobayashi, Dilini Singappuli-Arachchige, Igor I Slowing, Marek Pruski
The distribution of organic functional groups attached to the surface of mesoporous silica nanoparticles (MSNs) via co-condensation was scrutinized using 1D and 2D 1H solid-state NMR, including the triple-quantum/single-quantum (TQ/SQ) homonuclear correlation technique. The excellent sensitivity of 1H NMR and high resolution provided by fast magic angle spinning (MAS) allowed us to study surfaces with very low concentrations of aminopropyl functional groups. The sequential process, in which the injection of tetraethyl orthosilicate (TEOS) into the aqueous mother liquor was followed by dropwise addition of the organosilane precursor, resulted in deployment of organic groups on the surface, which were highly clustered even in a sample with a very low loading of ∼0...
August 17, 2018: Physical Chemistry Chemical Physics: PCCP
Marziye Sadat Mirhosseyni, Firouzeh Nemati, Ali Elhampour
AIM AND OBJECTIVE: One of the principles of green chemistry is using inexpensive reagents and catalysts to design green route for synthesis of organic compounds. Recently magnetic nanoparticles have provided a considerable merits. In this study, hollow Fe3O4@Dopamine-SO3H has been successfully applied for the green synthesis of tetrahydrobenzo[b]pyrans and spirooxindoles via one-pot multi-component reaction. MATERIALS AND METHODS: Chemical reagents were purchased from Merck and Aldrich...
August 17, 2018: Combinatorial Chemistry & High Throughput Screening
Chanaka Sandaruwan, H M P C K Herath, T S E F Karunarathne, S P Ratnayake, G A J Amaratunga, D P Dissanayake
Palladium nanoparticles display fascinating electronic, optical and catalytic properties, thus they can be used for various applications such as sensor fabrication. Conducting polymers such as polyaniline have also been widely used in sensor technology due to its cost effectiveness, versatility, and ease of synthesis. In this research, attention was given to unify the exceptional properties of these two materials and construct palladium nanoparticle coated polyaniline films to detect hydrogen and moisture. Electrochemical polymerization of aniline was carried out on gold sputtered epoxy resin boards...
August 16, 2018: Chemistry Central Journal
Chaoqiao Liu, Jianzhi Huang, Lishi Wang
The authors describe a method for electrochemical synthesis of a nanocomposite consisting of carboxylated multi-walled carbon nanotubes, polythionine and platinum nanoparticles (denoted as cMWCNT@pTh@Pt). The composite was placed on a glassy carbon electrode (GCE) to obtain a sensor for simultaneous determination of myricetin and rutin by differential pulse voltammetry, with typical peak voltages of 0.16 and 0.34 V (vs. SCE). Under optimal conditions, the modified GCE has a linear response in the range of 0...
August 16, 2018: Mikrochimica Acta
Alexander Egeberg, Lucas Warmuth, Sven Riegsinger, Dagmar Gerthsen, Claus Feldmann
CoN, Ni3N and Cu3N nanoparticles were obtained by pyridine-based synthesis using CoI2, NiI2, and CuI as the starting materials as well as NH3/KNH2 as the base and nitride source. Colloidally stable suspensions of crystalline, small-sized CoN (4.5 ± 0.7 nm), Ni3N (2.7 ± 0.4 nm), and Cu3N (4.2 ± 0.7 nm) were instantaneously available from refluxing pyridine. This approach strictly avoids all oxygen sources (including starting materials and solvents), which is highly relevant with regard to the material purity and properties...
August 17, 2018: Chemical Communications: Chem Comm
Kollur Shiva Prasad, Govindaraju Shruthi, Chandan Shivamallu
In the present study, we describe the facile synthesis of silver nanoparticles (AgNPs) and their nanostructures functionalized with 2-aminopyrimidine-4,6-diol (APD-AgNPs) for Hg2+ ion detection. The promising colorimetric response of APD-AgNPs to detect Hg2+ ions was visible with naked eyes and spectroscopic changes were examined by using a UV-Visible spectrophotometer. The aggregation of APD-AgNPs upon addition of Hg2+ ions was due to the chelation effect of the functionalized nanostructures and results in a color change from pale brown to deep yellow color...
August 16, 2018: Sensors
Saumaya Kirti, Vinay M Bhandari, Jyotsnarani Jena, Arnab S Bhattacharyya
In the present study, two synthesis methods of nanocomposites-one involving a mixture of biomass and the other using chemical modification were investigated to evaluate practical application of green approach in pollution control, specifically for water and wastewater treatment. Newer multifunctional superparamagnetic nanocomposites using biomaterials such as unripened fruit of Cassia fistula (Golden shower) and Aloe vera were developed as an example of green approach while chemical modification was illustrated using n-octanol...
August 13, 2018: Journal of Environmental Management
Yasin Karakaya, Sebastian Peukert, Tina Kasper
This work investigates the decomposition of tetramethylsilane and the formation of silicon oxide clusters in a laminar premixed low-pressure hydrogen flame using molecular-beam mass spectrometry (MBMS). A comprehensive list of the species that exist in the gas phase was compiled and spatially resolved mole fraction profiles of species in the flame were obtained. Quantitative data in dependence of height above the burner were obtained for all major species and intermediates. The MBMS detection technique allowed to monitor Si-C-O-H, and Si-O-H-containing compounds as well as C1-C2 species...
August 16, 2018: Journal of Physical Chemistry. A
Venkatesh S Manikandan, BalRam Adhikari, Aicheng Chen
The issue of foodborne related illnesses due to additives and contaminants poses a significant challenge to food processing industries. The efficient, economical and rapid analysis of food additives and contaminants is therefore necessary in order to minimize the risk of public health issues. Electrochemistry offers facile and robust analytical methods, which are desirable for food safety and quality assessment over conventional analytical techniques. The development of a wide array of nanomaterials has paved the way for their applicability in the design of high-performance electrochemical sensing devices for medical diagnostics and environment and food safety...
August 16, 2018: Analyst
Patricia Tegeder, Marcello Marelli, Matthias Freitag, Laura Polito, Sebastian Lamping, Rinaldo Psaro, Frank Glorius, Bart Jan Ravoo, Claudio Evangelisti
The synthesis of N-heterocyclic carbene (NHC)-stabilized palladium nanoparticles (PdNPs) by an entirely new strategy comprising the NHC functionalization of ligand-free PdNPs obtained by metal vapor synthesis is described. Detailed characterization confirms the formation of very small monodisperse PdNPs (2.3 nm) and the presence of the NHC ligand on the Pd surface. The stable NHC-functionalized PdNPs dispersed onto a carbon support showed high activity in the hydrogenation of limonene with enhanced regioselectivity in comparison to bare PdNPs on carbon...
August 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Nusaiba K Al-Nemrawi, Juliana Marques, Carlos J Tavares, Rami J Oweis, Mohamed G Al-Fandi
The aim of this work is to prepare ultraviolet (UV) triggered controlled release of compounds from microcapsule systems (MCs). Polyurethane (PU) and poly(methyl methacrylate) (PMMA) microcapsules were studied with/without chemical functionalization using photocatalytic TiO2 nanoparticles (NPs) on their surface. Once TiO2 nanoparticles are illuminated with UV light (λ = 370nm) they initiate the rupture of the polymeric bonds of the microcapsule and subsequently initiate the encapsulated compound release, methotrexate (MTX) or rhodamine (Rh), in the present work...
August 16, 2018: Drug Development and Industrial Pharmacy
Kazuhiko Maeda, Daehyeon An, Ryo Kuriki, Daling Lu, Osamu Ishitani
Graphitic carbon nitride (g-C3 N4 ) was synthesized by heating urea at different temperatures (773-923 K) in air, and was examined as a photocatalyst for CO2 reduction. With increasing synthesis temperature, the conversion of urea into g-C3 N4 was facilitated, as confirmed by X-ray diffraction, FTIR spectroscopy and elemental analysis. The as-synthesized g-C3 N4 samples, further modified with Ag nanoparticles, were capable of reducing CO2 into formate under visible light (λ > 400 nm) in the presence of triethanolamine as an electron donor, with the aid of a molecular Ru(II) cocatalyst (RuP)...
2018: Beilstein Journal of Organic Chemistry
Donya Farhanian, Gregory De Crescenzo, Jason R Tavares
Photo-initiated chemical vapor deposition (PICVD) has been adapted for use in a jet-assisted fluidized bed configuration, allowing for the encapsulation of magnetic iron oxide nanoparticles on a larger scale than ever reported (5 g). This new methodology leads to a functional coating with a thickness of 1.4-10 nm, confirmed by HRTEM and TGA. XPS and TOF-SIMS characterization confirm that the coating is composed of both aliphatic and polymerized carbon chains, with incorporated organometallic bonds and oxygen-containing moieties...
August 15, 2018: Scientific Reports
Anna Dzimitrowicz, Piotr Cyganowski, Pawel Pohl, Dorota Jermakowicz-Bartkowiak, Dominik Terefinko, Piotr Jamroz
Poly(vinylpyrrolidone)-stabilized Pt nanoparticles (PVP-PtNPs) were produced in a continuous-flow reaction-discharge system by application of direct current atmospheric pressure glow discharge (dc-APGD) operated between the surface of a flowing liquid anode (FLA) and a pin-type tungsten cathode. Synthesized PVP-PtNPs exhibited absorption across the entire UV/Vis region. The morphology and elemental composition of PVP-PtNPs were determined with transmission electron microscopy (TEM) and energy dispersive X-ray scattering (EDX), respectively...
August 15, 2018: Nanomaterials
Yongling Zhang, Yudi Shi, Zhengkun Qin, Mingxing Song, Weiping Qin
Small fluoride nanoparticles (NPs) with strong down-conversion (DC) luminescence at 1.5 μm are quite desirable for optical fiber communication systems. Nevertheless, a problem exists regarding how to synthesize small fluoride NPs with strong DC emission at 1.5 μm. Herein, we propose an approach to improve 1.5 μm emission of BaLuF₅:Yb3+ ,Er3+ NPs by way of combining doping Ce3+ ions and coating multiple BaLuF₅: Yb3+ active-shells. We prepared the BaLuF₅:18%Yb3+ ,2%Er3+ ,2%Ce3+ NPs through a high-boiling solvent method...
August 14, 2018: Nanomaterials
Gang Li, Yao Su, Yong-Yu Li, Yi-Xiang Li, Zheng Guo, Xing-Jiu Huang, Jinhuai Liu
Porous ZnO nanobelts sensitized with Ag nanoparticles have been prepared via a partial cation-exchange reaction assisted by a thermal oxidation treatment, employing ZnSe•0.5N2H4 nanobelts as precursors. After partially exchanged with Ag+ cations, the belt-like morphology of the precursors is still preserved. Continuously calcined in air, they are in-situ transformed into Ag nanoparticles sensitized porous ZnO nanobelts. The size of the Ag nanoparticles can be tuned through manipulating the amount of exchanging Ag+ cations...
August 15, 2018: Nanotechnology
Salwa Mowafi, Hany Kafafy, Amany Arafa, Karima Haggag, Mohamed Rehan
In this manuscript, we report the simple method to multifunctional wool fiber surfaces. The multifunctional wool fibers were devised with brilliant coloration, antimicrobial activity, and UV-protection property. These multifunctional properties were progressed by in situ assemble of silver nanoparticles (Ag NPs) into the wool fiber surface using green cleaner one-pot route. The proteins existing in the wool fibers acted being a redox active bio-template, facilitating the reduction of Ag+ to Ag0 , with simultaneous binding of the produced Ag NPs both on the surface and within the center of the wool fibers...
August 14, 2018: Environmental Science and Pollution Research International
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