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Synthesis of nanoparticles

Qiao Zhang, Yanping Zhou, Feng Xu, Huijuan Lin, Yan Yan, Kun Rui, Chenjun Zhang, Qingqing Wang, Zhongyuan Ma, Yao Zhang, Kama Huang, Jixin Zhu, Wei Huang
Two-dimensional (2D) carbon hybrids have demonstrated promising application in various areas like energy storage and catalysis. Yet, the exploration of simple methods for controllable fabrication of 2D graphitic carbon hybrids in a scalable manner remains challenging. Herein, a novel microwave assisted strategy for mass production of 2D carbon hybrids based on self-boosting catalytic carbonization of metal-agarose framework is demonstrated. Hybrids including hollow Fe3C nanoparticles, Ni/Co nanoparticles, and hollow FeOx nanoparticles uniformly embedded in 2D graphitic carbon nanosheets (GCNs) are obtained respectively, demonstrating the generality of the approach...
October 17, 2018: Angewandte Chemie
Yeong-Gyu Gil, Seounghun Kang, Ari Chae, Young-Kwan Kim, Dal-Hee Min, Hongje Jang
Porous palladium nanoparticles were designed and synthesized to maximize the pharmacological activity of the chaga mushroom (Inonotus obliquus) extract, which has anticancer and antibacterial activities. In the present study, we synthesized anisotropic porous Pd nanostructures with ultraviolet-visible-near infrared whole wavelength region absorption using chaga extract concentration-dependent reductant-mediated synthesis. The porous Pd nanoparticles exhibited a surface chaga extract-derived anticancer effect, controlled delivery of doxorubicin through electrostatic interaction, and a photothermal conversion effect under 808 nm laser irradiation...
October 18, 2018: Nanoscale
H Rojas-Chávez, H Cruz-Martínez, E Flores-Rojas, J M Juárez-García, J L González-Domínguez, N Daneu, J Santoyo-Salazar
A fundamental understanding of the Ostwald ripening effect (ORE) during the mechanochemical synthesis of PbTe nanostructures is presented. The ripening process involves the coarsening of larger particles from those of smaller size; this phenomenon was systematically evaluated at different stages of milling by microscopy analyses (AFM, TEM, STEM and HRTEM). At the early stage of milling, smaller particles and quantum dots are eventually dissolved to lower the total energy assciated with their surfaces. The ripening process - during milling - involves short-range mass transfer among particles...
October 17, 2018: Physical Chemistry Chemical Physics: PCCP
Seyyed Mojtaba Mousavi, Seyyed Alireza Hashemi, Younes Ghasemi, Amir Atapour, Ali Mohammad Amani, Amir Savar Dashtaki, Aziz Babapoor, Omid Arjmand
Development of biologically inspired green synthesis of silver nanoparticles has attracted considerable worldwide attention in matter of medical science and disease treatment. Herein, the green synthesis of silver nanomaterials using organic green sources has been evaluated and discussed. These kinds of materials are widely used for treatment of antibiotic-resistant bacteria, cancer and etc due to their elegant properties compared with other chemical ways and drugs. Moreover, the outcome of green-based approaches were compared with chemical procedures and obtained data were examined via various analyses including UV-visible spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), atomic force microscopy (AFM) and Fourier transforms infrared spectroscopy (FT-IR)...
October 17, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Adél Anna Ádám, Márton Szabados, Ádám Polyákovics, Katalin Musza, Zoltán Kónya, Ákos Kukovecz, Pál Sipos, István Pálinkó
The hydrazine reduction method was applied for the synthesis of nickel nanoparticles without using inert atmosphere and added surface active agents. The effect of the preparation temperature and the chemical quality of the metal sources as well as the solvents were studied. The generation of nanoparticles were studied primarily by X-ray diffractometry, but scanning and transmission electron microscopies as well as dynamic light scattering measurements were also used for the better understanding of the nanoparticles behaviour...
January 1, 2019: Journal of Nanoscience and Nanotechnology
E Bartfai, K Nemeth, B El Mrabate, M Udayakumar, K Hernadi, Z Nemeth
Here we report the application of zinc oxide (ZnO) coated multi-walled carbon nanotube (MWCNT) composites in the photocatalytic decomposition of acetaldehyde (AA). Zinc oxide nanoparticles were successfully coated on the multi-walled carbon nanotube via impregnation process using zinc acetate (Zn(CH₃COO)₂×2H₂O) as precursor and sodium dodecyl sulfate (SDS) treated multiwalled carbon nanotube as raw material under different solvent conditions. The applied solvents during preparation were ethanol (EtOH) and water (H₂O)...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Wenlong Fu, Fei Xue, Maochang Liu, Liejin Guo
With giving property to guide and control charge carries at the nanoscale, fabrication of heterostructure photocatalyst with desirable spatial distribution has been significantly valued. In this study, by using CuS nanoplates as seeds, CuS@ZnS core-shell heterojunction photocatalysts with diverse morphologies were developed via controlled synthesis kinetics. Kinetic control was completed through manipulation of the injection rate of Zn2+ precursor with a syringe pump as well as the reaction temperature. It is found that the growth is determined by the deposition rate relative to the diffusion rate of the ZnS growth monomers...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Kamal Kumar Paul, P K Giri
Shape tailored TiO₂ nanostructures with various dimensionality (zero to three dimension) have unique physicochemical and functional properties that facilitates its efficient energy and environment applications, e.g., solar light driven photocatalytic hydrogen generation and decontamination of organic/inorganic toxic pollutants, CO₂ reduction into the hydrocarbon fuels, solar cells, supercapacitors and lithium-ion batteries etc. However, the wide band gap nature and the fast recombination of the photogenerated charge carriers in TiO₂ usually limit its overall performance under solar light illumination...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Iris Martín-García, Francisco Alonso
Lately, the cross-dehydrogenative coupling of tetrahydroisoquinolines and nitroalkanes has become a widely studied reaction in organic chemistry; the corresponding β-nitroamines are generally formed irrespective of the catalysis and activation mode utilized. A quite distinct behavior has been observed when the reaction is catalyzed by copper nanoparticles supported on titania, leading to the formation of 5,6-dihydroindolo[2,1-a]isoquinolines with high selectivity and good yields. A meticulous reaction mechanism is proposed, based on experimentation, and discussed along with a key chemical modification of these compounds...
October 16, 2018: Chemistry: a European Journal
Margaryta Babych, Geneviève Bertheau-Mailhot, Ximena Zottig, Jessica Dion, Laurie Gauthier, Denis Archambault, Steve Bourgault
The design of nanoparticles exposing a high density of antigens constitutes a promising strategy to address safety concerns of conventional life-attenuated vaccines as well as to increase the immunogenicity of subunit vaccines. In this study, we developed a fully synthetic nanovaccine based on an amyloid peptide sequence with high self-assembling properties. The immunogenic epitope E2EP3 from the E2 glycoprotein of the Chikungunya virus was used to evaluate the potential of a 10-mer peptide derived from an endogenous amyloidogenic polypeptide as a novel vaccine platform...
October 16, 2018: Nanoscale
Feng Yang, Aimei Li, Han Liu, Hairong Zhang
Purpose: Gastric cancer is one of the most common human epithelial malignancies, and using nanoparticles (NPs) in the diagnosis and treatment of cancer has been extensively studied. The aim of this study was to develop hyaluronic acid (HA) containing lipid NPs coloaded with cisplatin (CDDP) and sorafenib (SRF) for the treatment of gastric cancer. Materials and methods: HA and CDDP containing lipid prodrug was synthesized using polyethylene glycol (PEG) as a linker (HA-PEG-CDDP)...
2018: Drug Design, Development and Therapy
Fransiscus F A Kerans, Lisa Lungaro, Asim Azfer, Donald M Salter
The magnetization of mesenchymal stem cells (MSC) has the potential to aid tissue engineering approaches by allowing tracking, targeting, and local retention of cells at the site of tissue damage. Commonly used methods for magnetizing cells include optimizing uptake and retention of superparamagnetic iron oxide nanoparticles (SPIONs). These appear to have minimal detrimental effects on the use of MSC function as assessed by in vitro assays. The cellular content of magnetic nanoparticles (MNPs) will, however, decrease with cell proliferation and the longer-term effects on MSC function are not entirely clear...
October 14, 2018: International Journal of Molecular Sciences
Ludmila Otilia Cinteza, Cristina Scomoroscenco, Sorina Nicoleta Voicu, Cristina Lavinia Nistor, Sabina Georgiana Nitu, Bogdan Trica, Maria-Luiza Jecu, Cristian Petcu
Silver nanoparticles (AgNPs) are considered a promising alternative to the use of antibiotics in fighting multidrug-resistant pathogens. However, their use in medical application is hindered by the public concern regarding the toxicity of metallic nanoparticles. In this study, rationally designed AgNP were produced, in order to balance the antibacterial activity and toxicity. A facile, environmentally friendly synthesis was used for the electrochemical fabrication of AgNPs. Chitosan was employed as the capping agent, both for the stabilization and to improve the biocompatibility...
October 13, 2018: Nanomaterials
James Aluha, Stéphane Gutierrez, François Gitzhofer, Nicolas Abatzoglou
A study was done on the effect of temperature and catalyst pre-treatment on CO hydrogenation over plasma-synthesized catalysts during the Fischer⁻Tropsch synthesis (FTS). Nanometric Co/C, Fe/C, and 50%Co-50%Fe/C catalysts with BET specific surface area of ~80 m² g⁻1 were tested at a 2 MPa pressure and a gas hourly space velocity (GHSV) of 2000 cm³ h-1 g-1 of a catalyst (at STP) in hydrogen-rich FTS feed gas (H₂:CO = 2.2). After pre-treatment in both H₂ and CO, transmission electron microscopy (TEM) showed that the used catalysts shifted from a mono-modal particle-size distribution (mean ~11 nm) to a multi-modal distribution with a substantial increase in the smaller nanoparticles (~5 nm), which was statistically significant...
October 12, 2018: Nanomaterials
Kumiko Miyajima, Yuki Miwa, Yoshitaka Kitamoto
Porous FePt microcapsules are fabricated for use in bead-based immunoassay technologies, that generally use magnetic spheres to immobilize biomolecules on their surface. The magnetic capsules can be used to carry assay reagents to reduce the time required to perform immunoassay processes, and microsize capsules are easier to manipulate magnetically than nanosize ones. Silica particles of approximately 2.5 μm diameter are used as templates and modified with poly(ethyleneimine) (PEI), which enables FePt nanoparticles to accumulate selectively on the template particles and an FePt shell to be formed by a polyol process...
October 3, 2018: Colloids and Surfaces. B, Biointerfaces
Hamed Nosrati, Marziyeh Salehiabar, Zahra Bagheri, Hamid Rashidzadeh, Soodabeh Davaran, Hossein Danafar
This study is a report about the synthesis iron oxide magnetic nanoparticles (IONPs) which modified with positive and negative charged amino acids (AAs). L-arginine (Arg) and L-aspartic acid (Asp) which have of guanidinium and carboxylic acid groups, respectively, were selected for this study. After loading Chrysin in amino acids modified iron oxide magnetic nanoparticles (F@AAs@Chrysin NPs), it was characterized by XRD, TGA, FTIR, VSM and TEM techniques. Finally, MTT assays on HFF-2 and HEK-293 cell lines were performed for determination of biocompatibility of AA coated IONPs...
October 15, 2018: Pharmaceutical Development and Technology
Sania Naz, Saira Tabassum, Nelson Freitas Fernandes, Mohammad Mujahid, Muhammad Zia, Esperanza J Carcache de Blanco
The present study reports ecofriendly synthesis of CuO nanoparticles (NPs) using an extract of Rhus punjabensis as a reducing agent. NPs structural and composition analysis are evaluated by X-rays diffraction (XRD), Fourier transform infrared, Energy dispersive spectroscopy, Scanning electron microscopy, Transmission electron microscopy, and Thermal analysis. The NPs have pure single phase monoclinic geometry with spherical structure and high stability toward heat and with average particle size of about 36...
October 15, 2018: Natural Product Research
Dengke Wang, Xiang Li, Ling-Ling Zheng, Lu-Mei Qin, Shuang Li, Peng Ye, Yan Li, Jian-Ping Zou
CdS nanoparticle-decorated covalent triazine-based frameworks (CdS NPs/CTF-1) were controllably synthesized via a facile one-pot solvothermal method. Due to the Lewis basic nature of well-defined nitrogen sites in triazine units of CTF-1, highly dispersed and size-controlled CdS NPs were obtained and stabilized on the surface of CTF-1 layers. The as-prepared CdS NPs/CTF-1 assembly showed higher photocatalytic activity in a hydrogen evolution reaction under visible light irradiation as compared with pure CdS and CTF-1 and their physical mixture...
October 15, 2018: Nanoscale
Sun-Jie Xu, Qian Shen, Gui-E Chen, Zhen-Liang Xu
Organic solvent nanofiltration (OSN) membranes are always troubled by the "trade-off" effect between solvent flux and solute rejection. Hence, a rapid, convenient, and effective way to synthesize novel β-cyclodextrin-enhanced zeolite imidazole framework-8 (β-CD@ZIF-8) nanoparticles was first proposed and the nanoparticles were doped into both selective layer and poly( m -phenylene isophthalamide) support for fabricating thin-film nanocomposite membranes. Transmission/scanning electron microscopy images and X-ray photoelectron spectroscopy results demonstrate the successful synthesis of β-CD@ZIF-8...
September 30, 2018: ACS Omega
Faria K Naqvi, Mohd Faraz, Saba Beg, Neeraj Khare
Recently, Bi4 V2 O11 as an electrolyte material has pulled in considerable consideration because of its remarkable novel applications. In this article, novel, dysprosium-doped ( x = 0.2, 0.3, 0.4, and 0.5) Bi4 V2 O11 (Dy/BVO) nanoparticles have been synthesized by sol-gel strategy. The photocatalyst Dy/BVO nanoparticles exhibit higher photocatalytic efficiency than BVO nanoparticles assessed by debasement of tetracycline drug under visible light illumination. Our work focuses on the phase transformation, conducting properties, and mechanisms of the Dy/BVO nanoparticles in relation to execute some methods of processing and manufacturing product in commercial applications...
September 30, 2018: ACS Omega
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