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Mechanism for Sustainable Magnetic Nanoparticles under Ambient Conditions
N. H. Hai,N. D. Phu,N. H. Luong,N. Chau,H. D. Chinh,L. H. Hoang,D. L. Leslie-Pelecky 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Iron-based magnetic fluids are widely used in physical applications. Recently, they have been extended to many biological applications due to their magnetic and biocompatible properties. However, their stability under an ambient environment still has not been systematically investigated. In this report, we present the oxidation process of magnetic fluids. The oxidation process depends on the materials that make the nanoparticles, the diffusion of oxygen atoms from the environment to the magnetic nanoparticles, which mainly depends on the viscosity of the solution and the surfactant that coats the nanoparticles. We suggest three ways to protect nanoparticles from oxidation: (a) using highly viscous carrier liquid (b) using relevant surfactants and (c) substitution of Ni²+ and Co²+ for Fe²+ in magnetite. Methods (a) and (b) are general, so they can be applied for many environmentally sensitive magnetic fluids. Method (c) is specific for a magnetite fluid. Iron-based magnetic fluids are widely used in physical applications. Recently, they have been extended to many biological applications due to their magnetic and biocompatible properties. However, their stability under an ambient environment still has not been systematically investigated. In this report, we present the oxidation process of magnetic fluids. The oxidation process depends on the materials that make the nanoparticles, the diffusion of oxygen atoms from the environment to the magnetic nanoparticles, which mainly depends on the viscosity of the solution and the surfactant that coats the nanoparticles. We suggest three ways to protect nanoparticles from oxidation: (a) using highly viscous carrier liquid (b) using relevant surfactants and (c) substitution of Ni²+ and Co²+ for Fe²+ in magnetite. Methods (a) and (b) are general, so they can be applied for many environmentally sensitive magnetic fluids. Method (c) is specific for a magnetite fluid.
A lower hybrid current drive system for ITER
Hoang, G.T.,Bé,coulet, A.,Jacquinot, J.,Artaud, J.F.,Bae, Y.S.,Beaumont, B.,Belo, J.H.,Berger-By, G.,Bizarro, Joã,o P.S.,Bonoli, P.,Cho, M.H.,Decker, J.,Delpech, L.,Ekedahl, A.,Garcia, J. International Atomic Energy Agency 2009 Nuclear fusion Vol.49 No.7
<P>A 20 MW/5 GHz lower hybrid current drive (LHCD) system was initially due to be commissioned and used for the second mission of ITER, i.e. the <I>Q</I> = 5 steady state target. Though not part of the currently planned procurement phase, it is now under consideration for an earlier delivery. In this paper, both physics and technology conceptual designs are reviewed. Furthermore, an appropriate work plan is also developed. This work plan for design, R&D, procurement and installation of a 20 MW LHCD system on ITER follows the ITER Scientific and Technical Advisory Committee (STAC) T13-05 task instructions. It gives more details on the various scientific and technical implications of the system, without presuming on any work or procurement sharing amongst the possible ITER partners. This document does not commit the Institutions or Domestic Agencies of the various authors in that respect.</P>
Validation and application of HPLC-ESI-MS/MS method for the determination of irsogladine
Hoang, N. H.,Huong, N. L.,Hong, S.-Y.,Park, Je Won Akademiai Kiado Zrt. 2017 Acta chromatographica Vol.29 No.4
<P>A highly sensitive analytical tool for the fast quantification of irsogladine in human plasma was developed. Cleanup using a solid-phase extraction technique is a simple method for extracting both irsogladine and lamotrigine (internal standard) spiked into human plasma. The resolvable separation of both analytes through reversed-phase high-performance liquid chromatography (HPLC) was carried out within 5 min. The HPLC-electrospray ionization (ESI)-tandem mass spectrometry (MS/MS) method, which was operated in a selected reaction monitoring mode specific to the target analytes, was verified for use in the quantification of irsogladine. The inter-and intra-day precision (relative standard deviation, RSD) of irsogladine spiked into quality control samples were <7%, and their accuracies were between 96.6% and 102.1%. The calibration curve for irsogladine spiked into human plasma was linear over the range from 1.8 to 100 ng mL(-1) with lower limit of quantification at 1.8 ng mL(-1). The established method was successfully applied for a bioequivalence study of irsogladine.</P>
Sorting CD4+ T Cells in Blood by Using Magnetic Nanoparticles Coated with Anti-CD4 Antibody
N. T. Khuat,V. T. A. Nguyen,T. N. Phan,L. H. Hoang,C. V. Thach,N. H. Hai,N. Chau 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
We used Fe3O4 magnetic nanoparticles (MNPs) which are coated with antiCD4 monoclonal antibody to bind selectively onto membranes of CD4+ T cells (hereafter antiCD4-MNPs). The antiCD4-MNPs were prepared through direct covalent interaction between the carboxyl group of the antiCD4 antibody and the amino group of amino-modified MNPs. The antiCD4-MNPs were mixed with human blood cells, followed by bursting the red blood cells with hypotonic buffer; then, the antiCD4-MNPs coated cells were separated by using a magnet. We observed the number of cells bound with magnetite clusters and particles. When fluorescence isothiocyanate labeled antiCD4- MNPs was used to observe the CD4+ T cells, the fluorescent intensity was improved by about two times compared to that when cells were labeled with the antiCD4 antibody only. This is a potential method to sort helper CD4+ T cells for observation under conventional microscopes. We used Fe3O4 magnetic nanoparticles (MNPs) which are coated with antiCD4 monoclonal antibody to bind selectively onto membranes of CD4+ T cells (hereafter antiCD4-MNPs). The antiCD4-MNPs were prepared through direct covalent interaction between the carboxyl group of the antiCD4 antibody and the amino group of amino-modified MNPs. The antiCD4-MNPs were mixed with human blood cells, followed by bursting the red blood cells with hypotonic buffer; then, the antiCD4-MNPs coated cells were separated by using a magnet. We observed the number of cells bound with magnetite clusters and particles. When fluorescence isothiocyanate labeled antiCD4- MNPs was used to observe the CD4+ T cells, the fluorescent intensity was improved by about two times compared to that when cells were labeled with the antiCD4 antibody only. This is a potential method to sort helper CD4+ T cells for observation under conventional microscopes.
Synthesis of hollow carbon-W18O49 composite and its photocatalytic properties
Park, J. e.,Vo, V.,Hoan, N. T.,Hoang, L. H.,Kim, S. J. Springer Science + Business Media 2016 Journal of materials science. Materials in electro Vol.27 No.3
<P>Composites of carbon and W18O49 were successfully synthesized by heating the mixtures of WO3 and urea at a temperature between 600 and 800 degrees C in inert atmosphere. The obtained materials were characterized by XRD, SEM, TEM, Raman, XPS, TG-DTA and N-2 adsorption/desorption at 77 K. The results showed that the composites consisted of W18O49 as a main phase which was coated by a thin carbon layer and exhibited a change in shape with heating temperature. The hollow form appeared from the treatment temperature of 700 degrees C and remained till 900 degrees C. However, at treatment 900 degrees C, the W18O49 disappeared and WO2 formed instead. The adsorption and visible-light photocatalytic degradation of methylene blue on the composites were evaluated.</P>