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Blue nanoparticles

Lucila I Doumic, Micaela Génova, Gregor Žerjav, Albin Pintar, Miryan C Cassanello, Hernán E Romeo, María A Ayude
A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO2 (rutile) monoliths prepared via directional freezing of aqueous dispersions of TiO2 nanoparticles. The catalytic performance was evaluated in the HFT oxidation of an azo dye frequently used as a model contaminant, Orange G (OG). Experiments were carried out in a liquid batch-recycle reactor, in which the liquid flow rate was set to ensure negligible external mass transfer resistance...
February 13, 2019: Journal of Environmental Management
Devaraj Bharathi, R Ranjithkumar, B Chandarshekar, V Bhuvaneshwari
The surface coating of metal oxide nanoparticles using biopolymer chitosan has evolved to become an important area of polymer nanotechnology. Herein, we report the preparation of chitosan coated zinc oxide (CS-ZnO) nanocomposite for the first time by a green chemistry approach using bioflavonoid rutin. The formation of CS-ZnO nanocomposite was preliminarily confirmed by color change and UV-Visible spectroscopy. FE-SEM images revealed agglomeration of CS-ZnO nanocomposite having predominant rod shaped structure...
February 13, 2019: International Journal of Biological Macromolecules
Abhijit Saha, Suman Neogy, Dumpala Rama Mohana Rao, Sadhan Bijoy Deb, Manoj Kumar Saxena, Bhupendra Singh Tomar
The authors describe the synthesis and characterization of 3-mercaptopropionylamidoxime functionalized gold nanoparticles (AuNPs) for visual detection of uranium (U) by cloud point extraction. The method is capable of quantifying U at the concentration limits set by the World Health Organization in drinking water i.e., 30.0 ng mL-1 . The method is based on the gradual color change from red to blue that occurs as a result of the interaction between uranyl ion and the modified AuNPs leading to particle aggregation...
February 15, 2019: Mikrochimica Acta
Zheng Zhao, Chao Chen, Wenting Wu, Fenfen Wang, Lili Du, Xiaoyan Zhang, Yu Xiong, Xuewen He, Yuanjing Cai, Ryan T K Kwok, Jacky W Y Lam, Xike Gao, Pingchuan Sun, David Lee Phillips, Dan Ding, Ben Zhong Tang
The exciting applications of molecular motion are still limited and are in urgent pursuit, although some fascinating concepts such as molecular motors and molecular machines have been proposed for years. Utilizing molecular motion in a nanoplatform for practical application has been scarcely explored due to some unconquered challenges such as how to achieve effective molecular motion in the aggregate state within nanoparticles. Here, we introduce a class of near infrared-absorbing organic molecules with intramolecular motion-induced photothermy inside nanoparticles, which enables most absorbed light energy to dissipate as heat...
February 15, 2019: Nature Communications
Navish Kataria, V K Garg
This work explored the potential of magnetic sawdust carbon nanocomposites for cationic dyes removal from aqueous medium. EDTA modified magnetic sawdust carbon nanocomposites (EDTA@Fe3 O4 /SC ncs) were prepared by biogenic green reduction and precipitation approach. The surface properties, structure and composition of nanocomposites were characterized by HRTEM, FESEM, XRD, EDX, BET, FTIR etc. The Fe3 O4 nanoparticles were 10-20 nm in diameters and having 14 m2 /g surface area. Removal of Methylene blue (MB) and Brilliant green (BG) dyes from aqueous medium was studied in batch mode experiments...
February 2, 2019: Environmental Research
Yukari Kawabe, Takashi Ito, Hiroaki Yoshida, Hiroshi Moriwaki
The unique electronic, optical, and catalytic properties of AuNPs caused by localized surface plasmon resonance (LSPR) have attracted many scientists, but the LSPR diminishes the captivating luster of bulk gold. An exciting challenge is the fabrication of golden-colored AuNPs, but a decisive factor for controlling the absorption/reflection of AuNPs remains elusive. We now propose a simple and versatile method for the fabrication of glowing AuNPs to restore the "lost golden color" of AuNPs in combination with the deposition of AuNPs on a cellulose filter or a PET/cotton fabric by the successive ionic layer adsorption and reaction (SILAR) method and simple pencil drawing...
February 15, 2019: Nanoscale
Chandu Byram, Sree Satya Bharati Moram, Venugopal Rao Soma
Surface enhanced Raman spectroscopy (SERS) is a cutting edge analytical tool for trace analyte detection due to its highly sensitive, non-destructive and fingerprinting capability. Herein, we report the detection of multiple analytes from various mixtures using gold nanoparticles (NPs) and nanostructures (NSs) as SERS platforms. NPs and NSs were achieved through the simple approach of laser ablation in liquids (LAL) and their morphological studies were conducted with a UV-Visible absorption spectrometer, a high resolution transmission electron microscope (HRTEM) and a field emission scanning electron microscope (FESEM)...
February 15, 2019: Analyst
Henry H Mungondori, Spencer Ramujana, David M Katwire, Raymond T Taziwa
This work investigates the preparation of a magnetically recoverable photocatalytic nanocomposite of maghemite nanoparticles coated with silica and carbon doped titanium dioxide. The novel nanocomposite boasts the advantages of efficient photocatalytic degradation of organic pollutants in water and ease of recovery of the fine particles after water treatment. The photocatalytic nanocomposite was successfully synthesized through a stepwise approach via co-precipitation and sol-gel methods. Characterisation by Fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) substantiated the existence of the intended structure of the nanocomposite and the particles were found to be in the size range of 15-22 nm with a quasi-spherical shape...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Xiangxue Lyu, Qiufen Zhang, Dehai Liang, Yanbin Huang
Currently there is no successful platform technology for the sustained release of protein drugs. It seems inevitable to specifically develop new materials for such purpose, and hence the understanding of protein-material interactions is highly desirable. In this study, we synthesized cholesterol-grafted polyglutamate (PGA- g -Chol) as a hydrophobically-modified polypeptide, and thoroughly characterized its interaction with a model protein (human serum albumin) in the aqueous solution by using circular dichroism, fluorescence methods, and light scattering...
January 2019: Acta Pharmaceutica Sinica. B
Dong-Yung Kim, Jun-Hyung Kim, Jae-Chul Lee, Moo-Ho Won, Se-Ran Yang, Hyoung-Chun Kim, Myung-Bok Wie
Nanoparticles (NPs) have been recognized as both useful tools and potentially toxic materials in various industrial and medicinal fields. Previously, we found that zinc oxide (ZnO) NPs that are neurotoxic to human dopaminergic neuroblastoma SH-SY5Y cells are mediated by lipoxygenase (LOX), not cyclooxygenase-2 (COX-2). Here, we examined whether human bone marrow-derived mesenchymal stem cells (MSCs), which are different from neuroblastoma cells, might exhibit COX-2- and/or LOX-dependent cytotoxicity of ZnO NPs...
January 2019: Toxicological Research
Ariadna Lafourcade Prada, Hady Keita, Tatiane Pereira de Souza, Emerson Silva Lima, Leonard Domingo Rosales Acho, Márcia de Jesus Amazonas da Silva, José Carlos Tavares Carvalho, Jesus Rafael Rodriguez Amado
Purpose: This study aimed to evaluate the hypoglycemic effect, antioxidant, α-glucosidase and lipase inhibitory activity, and the cytotoxicity of the Cassia grandis nanodispersion (CgND). Methods: The hypoglycemic effect was evaluated in alloxan-induced diabetic mice. The particle size, polydispersion index, ζ-potential, and conductivity, as well as the drug-loaded content, were monitored in shelf-live, along a year. The delivery profile was evaluated in simulated intestinal fluids at pH 6...
February 2019: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
C Karunakaran, I JebaSing, P Vinayagamoorthy
Nanodiscs with ZnFe₂O₄ core and Ag-deposited ZnO shell have been synthesized by hydrothermal method. Scanning electron microscopy (SEM) shows the morphology as nanodiscs. X-ray diffractometry (XRD), selected area electron diffractometry (SAED) and Raman spectroscopy reveal cubic ZnFe₂O₄, hexagonal ZnO and face centered cubic Ag as the constituents of the synthesized nanodiscs. Energy dispersive X-ray spectroscopy (EDS) provides the atomic percentage of Ag as 0.6. High resolution transmission electron microscopy (HRTEM) displays the core-shell structure of the synthesized nanodiscs...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Shahin Homaeigohar, Niharika Krishna Botcha, Eman S Zarie, Mady Elbahri
Given the exponentially expanding water pollution causing water scarcity, there is an urgent need for operative nanotechnological systems that can purify water, with insignificant energy consumption, and rapidly. Here, we introduce a nanocomposite system based on TiO₂ nanoparticles (NPs) and PES nanofibers (NFs) that can adsorb and then photodecompose organic water pollutants such as dye molecules. We evaluate pros and cons of this system with respect to its purification efficiency and structural properties that can be impacted by the photocatalytic activity of the nanofillers...
February 12, 2019: Nanomaterials
Arya Hakimian, Steven McWilliams, Anna Ignaszak
The photoactive materials broadly applied in catalysis and energy conversion are generally composed of metal oxides. Among these oxides, ZnO showed a promising photocatalytic activity; however, traditional synthetic routes generated by-products and large amounts of secondary waste. Herein, we report the use of bipolar electrochemistry to generate ZnO nanoparticles using deionized water and a zinc metal to conform to green chemistry practices. TEM imaging demonstrated that the sizes of the bipolar-made ZnO particles were smaller than the commercial sample...
February 11, 2019: Materials
Xingcan Qian, Xu Zhou, Xin Ran, Hangcheng Ni, Zhi Li, Qing Qu, Jun Li, Guanben Du, Long Yang
In this work, a novel, facile, clean synthesis of monodisperse Au nanoparticles (AuNPs) with an average diameter of 5 nm was achieved by reducing HAuCl4 with dihydroxylatopillar[5]arene (2HP5) in basic solution without the use of harsh reagents and/or external energy. Accordingly, toluidine blue (TB), one electrochemcial indicator, could enter into the cavity of 2HP5 to fabricate host-guest complex through strong electrostatic interaction and charge-transfer interaction, which significantly enhanced the loading quantity of TB and effectively suppressed the leaking of TB resulting in an ultrasensitive and robust electrochemical response...
January 29, 2019: Biosensors & Bioelectronics
Kiran Preethi Kirubakaran, Sakthivel Thangavel, Gouthami Nallamuthu, Vinesh Vasudevan, Priya Arul Selvi Ramasubramanian, Ashwini Kumar, Gunasekaran Venugopal
In this paper, we report on the facile synthesis of graphitic carbon nitride (g-C₃N₄)-tin oxide (SnO₂) nanohybrid as an efficient photocatalyst prepared via sol-gel method. SnO₂ nanoparticles are pointcontacted with g-C₃N₄. The results of physio-chemical characterizations such as SEM-EDAX, XRD, BET, FT-IR and UV-DRS spectra reveal the successful formation and integration of nanohybrid. The photocatalytic activity has been studied by using methylene-blue as a model dye for degradation. It has been observed that the pseudo-first order rate constant was increased up to 1...
June 1, 2019: Journal of Nanoscience and Nanotechnology
S Rosy Christy, L Srimathi Priya, M Durka, A Dinesh, N Babitha, S Arunadevi
In this present study, semiconductor zinc oxide (ZnO) nanoparticles were successfully prepared by microwave irradiation (ZnO-MIM) and conventional combustion (ZnO-CCM) method, respectively using Aloe vera plant extract as reducing agent. Crystal structure, purity and surface morphology of the samples were examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. UV-Visible diffuse reflectance (DRS) and photoluminescence (PL) spectral studies was used to analysis the optical property and band gap energy of the samples...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Ge Li, Bao-Dong Wang, Qi Sun, Wayne-Qiang Xu, Yi-Fan Han
Pure TiO₂ nanoparticles and ones doped with Fe and/or Ni were successfully prepared by a co-precipitation method from ilmenite. The samples were structurally characterized by XRD, XPS, FT-IR, UV-vis, SEM, EDX, AAS and BET measurement. The XRD results showed that all samples were anatase TiO₂, and no characteristic peaks of dopants were observed. The crystallite sizes of all doped TiO₂ nanoparticles were less than 20 nm and doping TiO₂ with metal ions can suppress the crystal growth of the particles...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Bing-Qiong Yu, Jian-Cheng Jin, Han-Feng Zou, Bei-Bei Wang, Huan He, Peng Jiang, Feng-Lei Jiang, Yi Liu
Intracellular reactive oxygen species (ROS) generation are associated with many diseases. Lots of studies focus on the detection of intracellular ROS by small fluorescent molecules. However, ROS recognized by biocompatible nanoparticles are relatively less reported. It is widely known that albumin-based nanomaterials possess unique advantages in biomedical applications because they are biodegradable and biocompatible. Herein, fluorescent protein nanoparticles (PNPs) were prepared using BSA as a starting material without introducing extra fluorescent molecules...
February 1, 2019: Colloids and Surfaces. B, Biointerfaces
Zahra Bahrami, Ali Akbari, Bagher Eftekhari-Sis
In this work, for the first time, we presented a novel design strategy to fabricate a new type of Octa-aminopropyl polyhedral oligomeric silsesquioxane hydrochloride salt (OA-POSS)-based Alg/PAAm DN gels, consisting of PAAm gel as the first chemical network and Alg/OA-POSS gel as the second chemical-physical network. Incorporation of OA-POSS nanoparticles with various feed ratio into the second network not only led to form strong coordination interactions but also in comparison to the other Alg/PAAm gels demonstrated superior mechanical properties...
February 8, 2019: International Journal of Biological Macromolecules
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