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Magnetic nanoparticles

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https://www.readbyqxmd.com/read/28541946/bi-amino-surface-functionalized-polyoxometalate-nanocomposite-as-an-environmentally-friendly-catalyst-synthesis-and-dye-degradation
#1
Niyaz Mohammad Mahmoodi, Mina Oveisi, Mokhtar Alina Asli, Mohammad Ali Rezvani, Amin Valipour
In this paper, cobalt ferrite magnetic nanoparticle was modified by N-(2-aminoethyl)-3-(trimethoxysilyl) propyl amine. Polyoxometalate was immobilized on the modified bi-amino surface functionalized nanoparticle to prepare the environmentally friendly catalyst nanoparticle (EFCN). The synthesized EFCN was characterized using Fourier transform infrared, scanning electron microscopy and X-ray powder diffraction. The EFCN was used for photocatalytic dye degradation. Acid Red 18 and Direct Red 81 were used as model dyes...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541038/conical-ionic-amphiphiles-endowed-with-micellization-ability-but-lacking-air-and-oil-water-interfacial-activity
#2
Hirohisa Nitta, Koji Harano, Mayuko Isomura, Ellen H G Backus, Mischa Bonn, Eiichi Nakamura
Micellization in water and reduction of the surface tension of water interfaces with air and oil are two archetypical properties of surfactants, caused by self-aggregation and Gibbs monolayer formation at the interfaces, respectively. We present here a new type of amphiphiles that possess a conical shape consisting of a hydrophobic apex and five ionic termini at its base of the cone. The conical shape and the high charge density cooperatively impede the monolayer formation at the interfaces, and hence prevent foaming and emulsification...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28540811/gadolinium-doped-iron-oxide-nanoparticles-induced-magnetic-field-hyperthermia-combined-with-radiotherapy-increases-tumour-response-by-vascular-disruption-and-improved-oxygenation
#3
Pei-Shin Jiang, Hsin-Yu Tsai, Philip Drake, Fu-Nien Wang, Chi-Shiun Chiang
The gadolinium-doped iron oxide nanoparticles (GdIONP) with greater specific power adsorption rate (SAR) than Fe3O4 was developed and its potential application in tumour therapy and particle tracking were demonstrated in transgenic adenocarcinoma of the mouse prostate C1 (TRAMP-C1) tumours. The GdIONPs accumulated in tumour region during the treatment could be clearly tracked and quantified by T2-weighted MR imaging. The therapeutic effects of GdIONP-mediated hyperthermia alone or in combination with radiotherapy (RT) were also evaluated...
May 5, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28539274/the-analgesia-efficiency-of-ultrasmall-magnetic-iron-oxide-nanoparticles-in-mice-chronic-inflammatory-pain-model
#4
Ping-Ching Wu, Hung-Tsung Hsiao, Ya-Chi Lin, Dar-Bin Shieh, Yen-Chin Liu
Few studies have investigated the effects of iron oxide nanoparticles (NPs) on analgesia. We developed inflammatory pain models via complete Freund's adjuvant injection over the hind paw in CD1 mice. Various doses of magnetite (Fe3O4) NPs were injected into the paw. Analgesia behavior was checked with von Frey microfilament and thermal irradiation measurements. Paw skin tissues were harvested at the maximal analgesia time point. The presence of activated white cells (CD68, myeloperoxidase) and free radical (reactive oxygen species, ROS) production were also checked...
May 21, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28538684/magnetic-nanoparticles-for-antibiotics-detection
#5
REVIEW
Cecilia Cristea, Mihaela Tertis, Ramona Galatus
Widespread use of antibiotics has led to pollution of waterways, potentially creating resistance among freshwater bacterial communities. Microorganisms resistant to commonly prescribed antibiotics (superbug) have dramatically increased over the last decades. The presence of antibiotics in waters, in food and beverages in both their un-metabolized and metabolized forms are of interest for humans. This is due to daily exposure in small quantities, that, when accumulated, could lead to development of drug resistance to antibiotics, or multiply the risk of allergic reaction...
May 24, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28537455/efficacy-of-dipeptide-coated-magnetic-nanoparticles-in-lung-cancer-models-under-pulsed-electromagnetic-field
#6
Ganga Baskar, Mathangi Ravi, Jiban Jyoti Panda, Anjali Khatri, Bhawna Dev, Roy Santosham, Sekar Sathiya, Chidambaram Saravana Babu, Virander Singh Chauhan, Suresh K Rayala, Ganesh Venkatraman
Lung cancer is the leading cause of cancer deaths and the overall 5-year survival rate is less than 17%. Hyperthermia is an alternative approach for the treatment of lung cancer and is associated with fewer side effects. We employed ironoxide nanoparticles in inducing localized hyperthermia in lung cancer cells using a pulsed electromagnetic field (PEMF). We synthesized, characterized and determined the uptake of dipeptide-coated iron oxide nanoparticles. Further, their ability in inducing localized hyperthermia in PEMF on lung cancer cells was assessed...
May 24, 2017: Cancer Investigation
https://www.readbyqxmd.com/read/28537321/magneto-induced-anisotropy-in-magnetic-colloids-of-superparamagnetic-magnetite-nanoparticles-in-an-external-magnetic-field
#7
S V Kredentser, M M Kulyk, V M Kalita, K Y Slyusarenko, V Yu Reshetnyak, Yu A Reznikov
Here we report a study of chain formation and the magnetic anisotropy induced by them in suspensions of slightly anisotropic Fe3O4 nanoparticles in water and in aqueous V2O5 suspensions. An investigation into the magnetization of the fluid and frozen suspensions, the application of dynamic light scattering techniques and the observation of the magnetic anisotropy in the frozen magnetically aligned samples allowed us to confirm the existence of chains of Fe3O4 in both suspensions. Our study shows that the magneto-induced anisotropy appearing in magnetic fields in colloids with Fe3O4 particles is mainly due to many particle (chain) magneto-induced anisotropy, but not due to single particle magneto-induced anisotropy connected with particle shape anisotropy...
May 24, 2017: Soft Matter
https://www.readbyqxmd.com/read/28537285/towards-improved-magnetic-fluid-hyperthermia-major-loops-to-diminish-variations-in-local-heating
#8
Cristina Munoz-Menendez, David Serantes, Juan M Ruso, Daniel Baldomir
In the context of using magnetic nanoparticles for heat-mediated applications, the need of an accurate knowledge of the local (at the nanoparticle level) heat generation in addition to the usually studied global counterpart has been recently highlighted. Such a need requires accurate knowledge of the links among the intrinsic particle properties, system characteristics and experimental conditions. In this work we have investigated the role of the particles' anisotropy polydispersity in relation to the amplitude (Hmax) of the AC magnetic field using a Monte Carlo technique...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28536061/time-course-assessment-of-the-aggregation-and-metabolization-of-magnetic-nanoparticles
#9
José M Rojas, Helena Gavilán, Vanesa Del Dedo, Eduardo Lorente-Sorolla, Laura Sanz-Ortega, Gustavo B da Silva, Rocío Costo, Sonia Perez-Yagüe, Marina Talelli, Marzia Marciello, M Puerto Morales, Domingo F Barber, Lucía Gutiérrez
To successfully develop biomedical applications for magnetic nanoparticles, it is imperative that these nanoreagents maintain their magnetic properties in vivo and that their by-products are safely metabolized. When placed in biological milieu or internalized into cells, nanoparticle aggregation degree can increase which could affect magnetic properties and metabolization. To evaluate these aggregation effects, we synthesized citric acid-coated iron oxide nanoparticles whose magnetic susceptibility can be modified by aggregation in agar dilutions and dextran-layered counterparts that maintain their magnetic properties unchanged...
May 20, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28534925/osmotin-loaded-magnetic-nanoparticles-with-electromagnetic-guidance-for-the-treatment-of-alzheimer-s-disease
#10
Faiz Ul Amin, Ali Kafash Hoshiar, Ton Duc Do, Yeongil Noh, Shahid Ali Shah, Muhammad Sohail Khan, Jungwon Yoon, Myeong Ok Kim
Alzheimer's disease (AD) is the most prevalent age-related neurodegenerative disease, pathologically characterized by the accumulation of aggregated amyloid beta (Aβ) in the brain. Here, we describe for the first time the development of a new, pioneering nanotechnology-based drug delivery approach for potential therapies for neurodegenerative diseases, particularly AD. We demonstrated the delivery of fluorescent carboxyl magnetic Nile Red particles (FMNPs) to the brains of normal mice using a functionalized magnetic field (FMF) composed of positive- and negative-pulsed magnetic fields generated by electromagnetic coils...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534619/quantitative-solid-state-nmr-study-on-ligand-surface-interaction-in-cysteine-capped-cdse-magic-sized-clusters
#11
Takuya Kurihara, Yasuto Noda, Kiyonori Takegoshi
Ligand-surface interaction of semiconductor nanoparticles (NPs) controls their optoelectronic properties, and thus examinations of the interaction are essential for the nanoelectronic applications of NPs. Herein, solid-state nuclear magnetic resonance (NMR) is performed to unravel the ligand-surface interaction in cysteine-capped CdSe magic-sized clusters. (15)N-(113)Cd through-bond J-filtered NMR directly shows the presence of the nitrogen-cadmium chemical bond for the first time and indicates that ~43% of the amines form the chemical bond...
May 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28532118/facile-synthesis-of-polymeric-fluorescent-organic-nanoparticles-based-on-the-self-polymerization-of-dopamine-for-biological-imaging
#12
Yingge Shi, Ruming Jiang, Meiying Liu, Lihua Fu, Guangjian Zeng, Qing Wan, Liucheng Mao, Fengjie Deng, Xiaoyong Zhang, Yen Wei
Polymeric fluorescent organic nanoparticles (polymer-FONs) have raised considerable research attention for biomedical applications owing to their advantages as compared with fluorescent inorganic nanoparticles and small organic molecules. In this study, we presented an efficient, facile and environment-friendly strategy to produce polymer-FONs, which relied on the self-polymerization of dopamine and polyethyleneimine (PEI) in rather mild conditions. To obtain the final polymer-FONs, aldehyde group-containing copolymers (named as poly(UA-co-PEGMA)) were synthesized by reversible addition-fragmentation chain-transfer polymerization using polyethylene glycol methyl ether methacrylate (PEGMA) and 1-undecen-10-al (UA) as monomers...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532109/lactoferrin-modified-graphene-oxide-iron-oxide-nanocomposite-for-glioma-targeted-drug-delivery
#13
Meng-Meng Song, Huai-Liang Xu, Jun-Xing Liang, Hui-Hui Xiang, Rui Liu, Yu-Xian Shen
Targeting delivery of drugs in a specific manner represents a potential powerful technology in gliomas. Herein, we prepared a multifunctional targeted delivery system based on graphene oxide (GO) that contains a molecular bio-targeting ligand and superparamagnetic iron oxide nanoparticles on the surface of GO for magnetic targeting. Superparamagnetic Fe3O4 nanoparticles was loaded on the surface of GO via chemical precipitation method to form GO@Fe3O4 nanocomposites. Lactoferrin (Lf), an iron-transporting serum glycoprotein that binds to receptors overexpressed at the surface of glioma cells and vascular endothelial cell of the blood brain barrier, was chosen as the targeted ligand to construct the targeted delivery system Lf@GO@Fe3O4 through EDC/NHS chemistry...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532042/ph-responsive-poly-aspartic-acid-hydrogel-coated-magnetite-nanoparticles-for-biomedical-applications
#14
Jaime Vega-Chacón, María Isabel Amaya Arbeláez, Janaina Habib Jorge, Rodrigo Fernando C Marques, Miguel Jafelicci
A novel multifunctional nanosystem formed by magnetite nanoparticles coated with pH-responsive poly(aspartic acid) hydrogel was developed. Magnetite nanoparticles (Fe3O4) have been intensively investigated for biomedical applications due to their magnetic properties and dimensions similar to the biostructures. Poly(aspartic acid) is a water-soluble, biodegradable and biocompatible polymer, which features makes it a potential candidate for biomedical applications. The nanoparticles surface modification was carried out by crosslinking polysuccinimide on the magnetite nanoparticles surface and hydrolyzing the succinimide units in mild alkaline medium to obtain the magnetic poly(aspartic acid) hydrogel...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532032/agar-gelatin-bilayer-gel-matrix-fabricated-by-simple-thermo-responsive-sol-gel-transition-method
#15
Yifeng Wang, Meng Dong, Mengmeng Guo, Xia Wang, Jing Zhou, Jian Lei, Chuanhang Guo, Chaoran Qin
We present a simple and environmentally-friendly method to generate an agar/gelatin bilayer gel matrix for further biomedical applications. In this method, the thermally responsive sol-gel transitions of agar and gelatin combined with the different transition temperatures are exquisitely employed to fabricate the agar/gelatin bilayer gel matrix and achieve separate loading for various materials (e.g., drugs, fluorescent materials, and nanoparticles). Importantly, the resulting bilayer gel matrix provides two different biopolymer environments (a polysaccharide environment vs a protein environment) with a well-defined border, which allows the loaded materials in different layers to retain their original properties (e...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531994/a-facile-one-step-method-for-preparation-of-fe3o4-cs-inh-nanoparticles-as-a-targeted-drug-delivery-for-tuberculosis
#16
Chili Zhao, Xun Liu, Xia Zhang, Hong Yan, Zhilei Qian, Xinghui Li, Zhenye Ma, Qiaorong Han, Chonghua Pei
In this paper, Fe3O4/chitosan/isoniazid magnetic nanoparticles (Fe3O4/CS/INH-MNPs) were prepared as an environmental stimuli-responsive drug-delivery system by automated in situ click technology, in which Fe3O4 magnetic nanoparticles, chitosan and isoniazid were simultaneously in situ crystallized by one-step method. The Fe3O4 magnetic nanoparticles and tripolyphosphate act as stable crosslinkers to produce numerous intermolecular crosslinkages for the mobility of the chitosan chains. Characterization results indicated that the multifunctional drug delivery system with optimized size, excellent loading capacity, well magnetic properties, nontoxicity and pH triggered drug release property is expected to be applied in tuberculosis treatment with excellent magnetic sensitivity and sustained release...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531979/synthesis-and-characterization-of-glycyrrhizic-acid-coated-iron-oxide-nanoparticles-for-hyperthermia-applications
#17
Mostafa Saeedi, Omid Vahidi, Shahin Bonakdar
In the present study, iron oxide magnetic nanoparticles (IONPs) were synthesized using the oxidative precipitation method for biomedical applications. Glycyrrhizic acid (GA) extracted from the roots of licorice plant was used as the coating agent for the synthesized nanoparticles (GAIONPs). The crystal phase, morphology and size were investigated by XRD, FE-SEM and TEM. The saturation magnetization (ms) value of the nanoparticles was measured by VSM indicating lowered ms of the GAIONPs with respect to that of the IONPs due to the presence of GA...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531147/oriented-growth-of-%C3%AE-mno%C3%A2-nanorods-using-natural-extracts-from-grape-stems-and-apple-peels
#18
Lina Sanchez-Botero, Adriana P Herrera, Juan P Hinestroza
We report on the synthesis of alpha manganese dioxide (α-MnO₂) nanorods using natural extracts from Vitis vinifera grape stems and Malus domestica 'Cortland' apple peels. We used a two-step method to produce highly crystalline α-MnO₂ nanorods: (1) reduction of KMnO₄ in the presence of natural extracts to initiate the nucleation process; and (2) a thermal treatment to enable further solid-state growth of the nuclei. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) images provided direct evidence of the morphology of the nanorods and these images were used to propose nucleation and growth mechanisms...
May 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28530736/magnetic-field-controlled-graphene-oxide-based-origami-with-enhanced-surface-area-and-mechanical-properties
#19
Ok-Kyung Park, Chandra Sekhar Tiwary, Yang Yang, Sanjit Bhowmick, Soumya Vinod, Qingbo Zhang, Vicki L Colvin, S A Syed Asif, Robert Vajtai, Evgeni S Penev, Boris I Yakobson, Pulickel M Ajayan
One can utilize the folding of paper to build fascinating 3D origami architectures with extraordinary mechanical properties and surface area. Inspired by the same, the morphology of 2D graphene can be tuned by addition of magnetite (Fe3O4) nanoparticles in the presence of a magnetic field. The innovative 3D architecture with enhanced mechanical properties also shows a high surface area (∼2500 m(2) g(-1)) which is utilized for oil absorption. Detailed microscopy and spectroscopy reveal rolling of graphene oxide (GO) sheets due to the magnetic field driven action of magnetite particles, which is further supported by molecular dynamics (MD) simulations...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28530722/the-origin-of-enhanced-photocatalytic-activities-of-hydrogenated-tio2-nanoparticles
#20
Yani Liu, Haifeng Feng, Xiaobing Yan, Jiaou Wang, Huagui Yang, Yi Du, Weichang Hao
The photocatalytic activity of semiconductors is largely governed by their light absorption, separation of photoinduced charge carriers and surface catalytically active sites, which are primarily controlled by the morphology, crystalline size, structure, and especially the electronic structure of photocatalysts. Black TiO2 is recognized as one of the most promising visible-light photocatalysts, due to its significantly enhanced visible-light photocatalytic performance in comparison to intrinsic TiO2. In this work, black TiO2 is synthesized through the hydrogenation process...
May 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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