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Magnetic properties

Wei Lu, Qin Gao, Chao Zou
Lyotropic chromonic (LC) mesophases have received much attention, due to the semi-stable nature of the chromonics. The balance is delicate between the forces attempting to create order and the thermal motion attempting to disrupt it. Thus, changes of temperature, concentration, electric and magnetic fields and the additives to the chromonic systems can be monitored sensitively. The general characterization methods for lyotropic chromonic mesophases, such as POM, multinuclear NMR spectroscopy and X-ray diffractometry, cryo-TEM and rheology etc...
August 11, 2018: Chemistry, An Asian Journal
S Lunghammer, D Prutsch, S Breuer, D Rettenwander, I Hanzu, Q Ma, F Tietz, H M R Wilkening
The realization of green and economically friendly energy storage systems needs materials with outstanding properties. Future batteries based on Na as an abundant element take advantage of non-flammable ceramic electrolytes with very high conductivities. Na3 Zr2 (SiO4 )2 PO4 -type superionic conductors are expected to pave the way for inherently safe and sustainable all-solid-state batteries. So far, only little information has been extracted from spectroscopic measurements to clarify the origins of fast ionic hopping on the atomic length scale...
August 10, 2018: Scientific Reports
Cornelius Krull, Marina Castelli, Prokop Hapala, Dhaneesh Kumar, Anton Tadich, Martina Capsoni, Mark T Edmonds, Jack Hellerstedt, Sarah A Burke, Pavel Jelinek, Agustin Schiffrin
Coordination chemistry relies on harnessing active metal sites within organic matrices. Polynuclear complexes-where organic ligands bind to several metal atoms-are relevant due to their electronic/magnetic properties and potential for functional reactivity pathways. However, their synthesis remains challenging; few geometries and configurations have been achieved. Here, we synthesise-via supramolecular chemistry on a noble metal surface-one-dimensional metal-organic nanostructures composed of terpyridine (tpy)-based molecules coordinated with well-defined polynuclear iron clusters...
August 10, 2018: Nature Communications
Kateřina Valentová, Kateřina Purchartová, Lenka Rydlová, Lenka Roubalová, David Biedermann, Lucie Petrásková, Alena Křenková, Helena Pelantová, Veronika Holečková-Moravcová, Eva Tesařová, Josef Cvačka, Jiří Vrba, Jitka Ulrichová, Vladimír Křen
Silymarin, an extract from milk thistle ( Silybum marianum ) fruits, is consumed in various food supplements. The metabolism of silymarin flavonolignans in mammals is complex, the exact structure of their metabolites still remains partly unclear and standards are not commercially available. This work is focused on the preparation of sulfated metabolites of silymarin flavonolignans. Sulfated flavonolignans were prepared using aryl sulfotransferase from Desulfitobacterium hafniense and p -nitrophenyl sulfate as a sulfate donor and characterized by high-resolution mass spectrometry (HRMS) and nuclear magnetic resonance (NMR)...
August 9, 2018: International Journal of Molecular Sciences
Laleh Adlnasab, Maryam Ezoddin, Rouh Allah Shojaei, Fezzeh Aryanasab
In this work, a new bio-inspired magnetic sorbent doped melamine-phytate supermolecular aggregate (Fe3 O4 /MPA) was applied in ultrasonic assisted dispersive micro solid-phase extraction (Fe3 O4 /MPA-UA-DMSPE) for the extraction of trace quantities of tyrosine kinase inhibitors (TKIs) (dasatinib, erlotinib, nilotinib). For this purpose, a mixture of phytic acid and melamine formed a supramolecular aggregate. In fact, adhesion between the carbon frameworks and nanoparticles was achieved by phytic acid as a crosslinker in order to prevent pores from collapsing...
August 3, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Cristina Lorente, Laura Cabeza, Beatriz Clares, Raúl Ortiz, Lyda Halbaut, Ángel V Delgado, Gloria Perazzoli, José Prados, José L Arias, Consolación Melguizo
Magnetoliposomes (MLPs) offer many new possibilities in cancer therapy and diagnosis, including the transport of antitumor drugs, hyperthermia treatment, detection using imaging techniques, and even cell migration. However, high biocompatibility and functionality after cell internalization are essential to their successful application. We synthesized maghemite nanoparticles (γ-Fe2 O3 ) by oxidizing magnetite cores (Fe3 O4 ) and coating them with phosphatidylcholine (PC) liposomes, obtained using the thin film hydration method, to generate MLPs...
July 31, 2018: Colloids and Surfaces. B, Biointerfaces
Ram Baskaran, Ramesh Bandikari, Wu Zuo, Jiaxin Qian, Ziduo Liu
A halo-tolerant glutaminase gene (BlglsA) was isolated from Bacillus licheniformis. Heterologous expression of BlglsA revealed that it encodes for a 36 kDa protein containing 327 amino acid residues. The purified enzyme showed optimal activity at a pH of 9.5 while 35 °C was found to be the optimum temperature. The enzyme retained about 92 and 97% stability at pH 12 and temperature (40 °C) respectively. Subsequent immobilization of BlglsA on nano magnetic cellulose sheet (NMCS) led to an enhanced tolerance to higher temperature...
August 7, 2018: International Journal of Biological Macromolecules
Running Niu, Du Lei, Fuqin Chen, Ying Chen, Xueling Suo, Lingjiang Li, Su Lui, Xiaoqi Huang, John A Sweeney, Qiyong Gong
To psychoradiologically investigate the topological organization of single-subject gray matter networks in patients with PTSD. Eighty-nine adult PTSD patients and 88 trauma-exposed controls (TEC) underwent a structural T1 magnetic resonance imaging scan. The single-subject brain structural networks were constructed based on gray matter similarity of 90 brain regions. The area under the curve (AUC) of each network metric was calculated and both global and nodal network properties were measured in graph theory analysis...
August 10, 2018: Human Brain Mapping
M A Basha, C L Prajapat, M Gupta, Harsh Bhatt, Yogesh Kumar, S K Ghosh, V Karki, S Basu, Surendra Singh
Antiferromagnetic coupling between rare-earth and transition metal ferromagnetic layers gives rise to various magnetic ground states in heterostructures of these materials. Interface structure and morphology tend to play important roles in magnetic properties of such systems. Interface induced magnetization in Gd/Co heterostructures has been studied using a combination of structural and magnetic characterization techniques. The interface morphology of the Gd/Co system was varied by growing Gd/Co multilayers using magnetron sputtering under different argon partial pressures...
August 10, 2018: Physical Chemistry Chemical Physics: PCCP
Ali Reza Allafchian, Seyed Amir Hossein Jalali, Farzane Aghaei, Hamid Reza Farhang
The metal nanoparticles, due to interesting features such as electrical, optical, chemical and magnetic properties, have been investigated repeatedly. Also, the mentioned nanoparticles have specific uses in terms of their antibacterial activity. The biosynthesis method is more appropriate than the chemical method for producing the nanoparticles because it does not need any special facilities; it is also economically affordable. In the current study, the silver nanoparticles (AgNPs) were obtained by using a very simple and low-cost method via Glaucium corniculatum (L...
August 2018: IET Nanobiotechnology
Muthulingam Seenuvasan, Govindasamy Vinodhini, Carlin Geor Malar, Nagarajan Balaji, Kannaiyan Sathish Kumar
Many industrial processes experience the advantages of enzymes which evolved the demand for enzymatic technologies. The enzyme immobilisation technology using different carriers has trustworthy applications in industrial biotechnology as these techniques encompass varied advantages such as enhanced stability, activity along with reusability. Immobilisation onto nanomaterial is highly favourable as it includes almost all aspects of science. Among the various techniques of immobilisation, the uses of nanoparticles are remarkably well perceived as these possess high-specific surface area leading to high enzyme loadings...
August 2018: IET Nanobiotechnology
Shi-Jin Dai, You-Cai Zhao, Dong-Jie Niu, Qiang Li, Yu Chen
Molten salt has been regarded as a versatile and environmental-friendly method for the material preparation and waste destruction. In this work, molten FeCl3 was utilized for the generation of magnetic biochar (MBC) derived from simultaneous activation and magnetization of biomass. The sample characterization indicated that MBC had a rough surface with BET surface area of 404 m2/g and total pore volume of 0.35cm3/g. Highly dispersed Fe3O4 and nitrogen could be deposited on the surface, leading to an excellent magnetization property...
August 10, 2018: Journal of the Air & Waste Management Association
Pia Sander, Aleksandra Markovic, Marc Schmidtmann, Oliver Janka, Gunther Wittstock, Rüdiger Beckhaus
Trinuclear titanium complexes coordinated by one ligand with three coordination sites have shown properties of mixed valency and a high number of reversible redox steps. Herein we report on the hexaphenyl-substituted derivative (Cp2 Ti)3 (μ3 -HATNPh6 ) (2). On reaction of 2 with the ferrocenium salt [Cp2 Fe]BF4 , the cationic complexes [(Cp2 Ti)3 (μ3 -HATNPh6 )] n+ ( n = 1-3; 3-5) become available in a selective way. Cyclic voltammograms show 10 reversible redox states of the trinuclear species 2 without decomposition...
August 10, 2018: Inorganic Chemistry
Jacob Overgaard, Emil A Klahn, Chen Gao, Beatrice Gillon, Arsen Gukasov, Xavier Fabreges, Ross O Piltz, ShangDa Jiang
The anisotropy of the magnetic properties of molecular magnets is a key descriptor in the search for improved magnets. Herein, we prove how a novel analysis approach using single crystal polarized neutron diffraction (PND) provides direct access to atomic magnetic susceptibility tensors. The technique has been applied for the first time to two Dy-based single molecule magnets, showing clear axial atomic susceptibility for both Dy(III)-ions. For the triclinic system, bulk magnetization methods are not symmetry-restricted, and the experimental magnetic easy axes from both PND, angular-resolved magnetometry (ARM) and theoretical approaches all match reasonably well...
August 10, 2018: Chemistry: a European Journal
Hui-Yan Liu, Jie Liu, Gui-Mei Gao, Hai-Ying Wang
Solvothermal reaction of 3,5-di(pyridin-4-yl) benzoic acid (HDPB) with Co(II) leads to a novel metal-organic framework, [Co2 O(DPB)2 (DMF)2 ]· xS (1), which represents a rare reo-type net with trigonal prismatic cobalt dimer, [Co2 O(CO2 )2 N4 ], as building blocks to construct a 3D framework containing three different types of nanoscale M12 L12 and M24 L12 polyhedron cages. More interestingly, under the same condition, the assembly of 4-methyl-3,5-di(pyridin-4-yl) benzoic acid (HMDPB) with Co(II) facilitates the formation of a cationic framework, [Co2 (MDPB)3 (DMF)](NO3 )· xS (2), with cobalt dimer, [Co2 (CO2 )3 N4 ], as building blocks...
August 10, 2018: Inorganic Chemistry
Mihai Flaviu Şuhani, Grigore Băciuţ, Mihaela Băciuţ, Raluca Şuhani, Simion Bran
Introduction: The key idea of nanotechnology is to construct and preserve functional structures by means of exploiting atoms and molecules. Nanotechnology has proven to be crucial in pharmacological medicine, tissue engineering, clinical diagnosis, long term conservation of biological tissues in a cryogenic state, protein detection, tumor destruction and magnetic resonance imaging.The aim of this paper is to review the literature on the specific characteristics of nanostructured materials, their applications and advantages that they bring to dentistry...
July 2018: Clujul Medical (1957)
John D Murray, Murat Demirtaş, Alan Anticevic
Noninvasive neuroimaging has revolutionized the study of the organization of the human brain and how its structure and function are altered in psychiatric disorders. A critical explanatory gap lies in our mechanistic understanding of how systems-level neuroimaging biomarkers emerge from underlying synaptic-level perturbations associated with a disease state. We describe an emerging computational psychiatry approach leveraging biophysically based computational models of large-scale brain dynamics and their potential integration with clinical and pharmacological neuroimaging...
July 19, 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
Behdad Pouran, Vahid Arbabi, Ambika G Bajpayee, Jasper van Tiel, Juha Töyräs, Jukka S Jurvelin, Jos Malda, Amir A Zadpoor, Harrie Weinans
As articular cartilage is an avascular tissue, the transport of nutrients and cytokines through the tissue is essential for the health of cells, i.e. chondrocytes. Transport of specific contrast agents through cartilage has been investigated to elucidate cartilage quality. In laboratory, pre-clinical and clinical studies, imaging techniques such as magnetic imaging resonance (MRI), computed tomography (CT) and fluorescent microscopy have been widely employed to visualize and quantify solute transport in cartilage...
June 22, 2018: Journal of Biomechanics
Paola Camiscia, Enrique D V Giordano, M Emilia Brassesco, Pablo Fuciños, Lorenzo Pastrana, M F Cerqueira, Guillermo A Picó, Nadia Woitovich Valetti
The cellulose from soybean hull, a waste without value from the argentine agriculture, was successfully obtained by using two different treatments: the traditional alkaline-bleaching pathway and from a simple pre-alkaline treatment at low temperatures. The comparison of both methods yielded similar results regarding its ability to open the lignin cellulosic structure of the hull and the total elimination of the lignin content. Fourier Transform Infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), Scanning electron microscopy (SEM), 13 C nuclear magnetic resonance (13 C-RMN) and Raman spectroscopy were used to characterize the structures and the properties of cellulose...
October 15, 2018: Carbohydrate Polymers
Jianfang Jiang, Chunyang He, Sen Wang, Hao Jiang, Jida Li, Linshan Li
Decomposing phenol and phenolic compounds to purify the environment is a focus of social attention. The use of ferromagnetic nanoparticles (MNP) to degrade phenol and phenolic compounds possesses many advantages and has received extensive attention. However, the unsatisfied catalyst activity and stability of MNP hamper its industrial applications. To improve MNP's properties, a ferromagnetic chitosan nanozyme (MNP@CTS) was synthesized via an improved hydrothermal method and molecular self-assembly technology...
October 15, 2018: Carbohydrate Polymers
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