共查询到20条相似文献,搜索用时 15 毫秒
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Magnetic Susceptibility Study of Sub‐Pico‐emu Sample Using a Micromagnetometer: An Investigation through Bistable Spin‐Crossover Materials 下载免费PDF全文
Souleymane Kamara Quang‐Hung Tran Vincent Davesne Gautier Félix Lionel Salmon Kunwoo Kim CheolGi Kim Azzedine Bousseksou Ferial Terki 《Advanced materials (Deerfield Beach, Fla.)》2017,29(46)
A promising and original method to study the spin‐transition in bistable spin‐crossover (SCO) materials using a magnetoresistive multiring sensor and its self‐generated magnetic field is reported. Qualitative and quantitative studies are carried out combining theoretical and experimental approaches. The results show that only a small part of matter dropped on the sensor surface is probed by the device. At a low bias‐current range, the number of detected nanoparticles depends on the amplitude of the current. However, in agreement with the theoretical model, the stray voltage from the particles is proportional to the current squared. By changing both the bias current and the concentration of particle droplet, the thermal hysteresis of an ultrasmall volume, 1 × 10?4 mm3, of SCO particles is measured. The local probe of the experimental setup allows a highest resolution of 4 × 10?14 emu to be reached, which is never achieved by experimental methods at room temperature. 相似文献
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On‐Chip Magnetic Platform for Single‐Particle Manipulation with Integrated Electrical Feedback 下载免费PDF全文
Marco Monticelli Andrea Torti Matteo Cantoni Daniela Petti Edoardo Albisetti Alessandra Manzin Erica Guerriero Roman Sordan Giacomo Gervasoni Marco Carminati Giorgio Ferrari Marco Sampietro Riccardo Bertacco 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(7):921-929
Methods for the manipulation of single magnetic particles have become very interesting, in particular for in vitro biological studies. Most of these studies require an external microscope to provide the operator with feedback for controlling the particle motion, thus preventing the use of magnetic particles in high‐throughput experiments. In this paper, a simple and compact system with integrated electrical feedback is presented, implementing in the very same device both the manipulation and detection of the transit of single particles. The proposed platform is based on zig‐zag shaped magnetic nanostructures, where transverse magnetic domain walls are pinned at the corners and attract magnetic particles in suspension. By applying suitable external magnetic fields, the domain walls move to the nearest corner, thus causing the step by step displacement of the particles along the nanostructure. The very same structure is also employed for detecting the bead transit. Indeed, the presence of the magnetic particle in suspension over the domain wall affects the depinning field required for its displacement. This characteristic field can be monitored through anisotropic magnetoresistance measurements, thus implementing an integrated electrical feedback of the bead transit. In particular, the individual manipulation and detection of single 1‐μm sized beads is demonstrated. 相似文献
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Spin‐Crossover Materials: Magnetic Susceptibility Study of Sub‐Pico‐emu Sample Using a Micromagnetometer: An Investigation through Bistable Spin‐Crossover Materials (Adv. Mater. 46/2017) 下载免费PDF全文
Souleymane Kamara Quang‐Hung Tran Vincent Davesne Gautier Félix Lionel Salmon Kunwoo Kim CheolGi Kim Azzedine Bousseksou Ferial Terki 《Advanced materials (Deerfield Beach, Fla.)》2017,29(46)
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George Chatzipirpiridis Carmela de Marco Eva Pellicer Olgaç Ergeneman Jordi Sort Bradley J. Nelson Salvador Pané 《Advanced Engineering Materials》2018,20(9)
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Ligand‐Free Fe3O4/CMCS Nanoclusters with Negative Charges for Efficient Structure‐Selective Protein Adsorption 下载免费PDF全文
Qi Yang Yue Zhu Minggang Yang Shaohua Ma Yao Wu Fang Lan Zhongwei Gu 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(17):2344-2353
The easy and effective capture of a single protein from a complex mixture is of great significance in proteomics and diagnostics. However, adsorbing nanomaterials are commonly decorated with specific ligands through a complicated and arduous process. Fe3O4/carboxymethylated chitosan (Fe3O4/CMCS) nanoclusters are developed as a new nonligand modified strategy to selectively capture bovine hemoglogin (BHB) and other structurally similar proteins (i.e., lysozyme (LYZ) and chymotrypsin (CTP)). The ligand‐free Fe3O4/CMCS nanoclusters, in addition to their simple and economical two‐step preparation process, possess many merits, including uniform morphology, high negative charges (?27 mV), high saturation magnetization (60 emu g?1), and high magnetic content (85%). Additionally, the ligand‐free Fe3O4/CMCS nanoclusters are found to selectively capture BHB in a model protein mixture even within biological samples. The reason for selective protein capture is further investigated from nanomaterials and protein structure. In terms of nanomaterials, it is found that high negative charges are conducive to selectively adsorb BHB. In consideration of protein structure, interestingly, the ligand‐free magnetic nanoclusters display a structure‐selective protein adsorption capacity to efficiently capture other proteins structurally similar to BHB, such as LYZ and CTP, showing great potential of the ligand‐free strategy in biomedical field. 相似文献
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Zorica Konstantinović José Santiso Lluis Balcells Benjamín Martínez 《Small (Weinheim an der Bergstrasse, Germany)》2009,5(2):265-271
Structural strain due to lattice mismatch is used to promote the formation of a self‐assembled network of antidots in highly epitaxial La2/3Sr1/3MnO3 thin films grown on (001) oriented SrTiO3 substrates by radiofrequency magnetron sputtering. Size, depth, and separation between antidots can be controlled by changing deposition parameters and the miscut angle of the substrate. This morphology exhibits a remarkable magnetic anisotropy and offers unique opportunities for versatile nanostencils for the preparation of nano‐object networks that can be of major relevance for the fabrication of oxide‐based magnetic and magnetoelectronic devices. 相似文献
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Multitheragnostic Multi‐GNRs Crystal‐Seeded Magnetic Nanoseaurchin for Enhanced In Vivo Mesenchymal‐Stem‐Cell Homing,Multimodal Imaging,and Stroke Therapy 下载免费PDF全文
Po‐Jung Chen Yi‐Da Kang Chen‐Huan Lin San‐Yuan Chen Chia‐Hung Hsieh You‐Yin Chen Chun‐Wei Chiang Wei Lee Chung‐Y Hsu Lun‐De Liao Chih‐Tai Fan Meng‐Lin Li Woei‐Cherng Shyu 《Advanced materials (Deerfield Beach, Fla.)》2015,27(41):6488-6495
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Carlo Ciulla Ustijana Rechkoska Shikoska Dimitar Veljanovski Filip A. Risteski 《International journal of imaging systems and technology》2018,28(1):54-63
The intensity‐curvature functional (ICF) of a model polynomial function is defined on a pixel‐by‐pixel basis by the ratio between the intensity‐curvature term before interpolation and the intensity‐curvature term after interpolation. Through the comparison with the traditional high‐pass filter (HPF), this work presents evidence that the ICFs of three model polynomial functions can be tuned as HPFs. The evidence consists of the mathematical characterization of the ICF‐based HPFs, qualitative comparisons in magnetic resonance imaging (MRI) of the human brain, and the determination of the finite impulse response (FIR) of the filters. The ICF‐based HPFs can remove periodic noise in the low‐frequency band. 相似文献
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A 4‐Fold‐Symmetry Hexagonal Ruthenium for Magnetic Heterostructures Exhibiting Enhanced Perpendicular Magnetic Anisotropy and Tunnel Magnetoresistance 下载免费PDF全文
Zhenchao Wen Hiroaki Sukegawa Takao Furubayashi Jungwoo Koo Koichiro Inomata Seiji Mitani Jason Paul Hadorn Tadakatsu Ohkubo Kazuhiro Hono 《Advanced materials (Deerfield Beach, Fla.)》2014,26(37):6483-6490
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Mengqiu Huang Lei Wang Ke Pei Wenbin You Xuefeng Yu Zhengchen Wu Renchao Che 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(14)
Metal–organic framework (MOF) is highly desirable as a functional material owing to its low density, tunable pore size, and diversity of coordination formation, but limited by the poor dielectric properties. Herein, by controlling the solvent and mole ratio of cobalt/linker, multidimension‐controllable MOF‐derived nitrogen‐doped carbon materials exhibit tunable morphology from sheet‐, flower‐, cube‐, dodecahedron‐ to octahedron‐like. Tunable electromagnetic parameters of Co@N‐doped carbon composites (Co@NC) can be obtained and the initial MOF precursor determines the distribution of carbon framework and magnetic cobalt nanoparticles. Carbonized Co@NC composites possess the following advantages: i) controllable dimension and morphology to balance the electromagnetic properties with evenly charged density distribution; ii) magnetic‐carbon composites offer plenty of interfacial polarization and strong magnetic coupling network; iii) a MOF‐derived dielectric carbon skeleton provides electronic transportation paths and enhances conductive dissipation. Surface‐mediated magnetic coupling reflects the stray magnetic flux field, which is corroborated by the off‐axis electron holography and micro‐magnetic simulation. Optimized octadecahedral Co@NC sample exhibits the best microwave absorption (MA) of ?53.0 dB at the thickness of 1.8 mm and broad effective frequency from 11.4 to 17.6 GHz (Ku‐band). These results pave the way to fabricate high‐performance MA materials with balanced electromagnetic distribution and controlled morphology. 相似文献
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