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Journal articles on the topic 'Magnetic nanocrystals'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Wang, Li, Hong Fang Sun, Hui Hua Zhou, and Jing Zhu. "Self-Assembly Growth and Size Control of Silver Nanocrystals for Nonvolatile Memory Applications." Materials Science Forum 610-613 (January 2009): 585–90. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.585.

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A film with a single-layer of size controlled silver nanocrystals embedded in silicon dioxide (SiO2) dielectric film by magnetic sputtering has been fabricated for nonvolatile memory applications. The effects of sputtering power, deposition time and substrate temperature on Ag nanocrystals formation were investigated. Transmission electron microscopy (TEM) images showed the as-prepared Ag nanocrystals had high uniformity in their size and distribution. The relationship between Ag nanocrystal size, density and electron storage capability as well as date retention time has been discussed.

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2

Zhang, Xinhai, Qiuling Chen, and Shouhua Zhang. "Ta2O5 Nanocrystals Strengthened Mechanical, Magnetic, and Radiation Shielding Properties of Heavy Metal Oxide Glass." Molecules 26, no. 15 (July 26, 2021): 4494. http://dx.doi.org/10.3390/molecules26154494.

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In this study, for the first time, diamagnetic 5d0 Ta5+ ions and Ta2O5 nanocrystals were utilized to enhance the structural, mechanical, magnetic, and radiation shielding of heavy metal oxide glasses. Transparent Ta2O5 nanocrystal-doped heavy metal oxide glasses were obtained, and the embedded Ta2O5 nanocrystals had sizes ranging from 20 to 30 nm. The structural analysis of the Ta2O5 nanocrystal displays the transformation from hexagonal to orthorhombic Ta2O5. Structures of doped glasses were studied through X-ray diffraction and infrared and Raman spectra, which reveal that Ta2O5 exists in highly doped glass as TaO6 octahedral units, acting as a network modifier. Ta5+ ions strengthened the network connectivity of 1–5% Ta2O5-doped glasses, but Ta5+ acted as a network modifier in a 10% doped sample and changed the frame coordination units of the glass. All Ta2O5-doped glasses exhibited improved Vicker’s hardness, magnetization (9.53 × 10−6 emu/mol), and radiation shielding behaviors (RPE% = 96–98.8%, MAC = 32.012 cm2/g, MFP = 5.02 cm, HVL = 0.0035–3.322 cm, and Zeff = 30.5) due to the increase in density and polarizability of the Ta2O5 nanocrystals.

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3

Yin, J. S., and Z. L. Wang. "Self-Assembled Cobalt Oxide Nanocrystals with Tetrahedral Shape." Microscopy and Microanalysis 4, S2 (July 1998): 736–37. http://dx.doi.org/10.1017/s1431927600023801.

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Nanocrystal materials are an emerging research field of chemistry, physics and materials science. The size and shape specificity of nanocrystals suggests them as building blocks for constructing selfassembly passivated nanocrystals superlattices (NCS's) or nanocrystals arrays (NCA) [1-6]. In this paper, NCAs of CoO with controlled tetrahedral shape are reported and their structural stability is examined by in-situ TEM.Cobalt oxide nanocrystals were synthesized by chemical decomposition of Co2(CO)8 in toluene under oxygen atmosphere, as given in detail elsewhere [1].Sodium bis(2-ethylhexyl) sulfosuccinate (Na(AOT)) was added as a surface active agent, forming an ordered monolayer passivation (called the thiolate) over the nanocrystal surface. The particle size was controlled by adjusting the wt.% ratio between the precursor and Na(AOT). The as-prepared solution contained Co, CoO and possibly C03O4 nanoparticles, and pure CoO nanoparticles were separated by applying a small magnetic field, which is generated by a horseshoe permanent magnet in vertical direction.

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4

Xiong, Zichang, Himashi P. Andaraarachchi, Jacob T. Held, Rick W. Dorn, Yong-Jin Jeong, Aaron Rossini, and Uwe R. Kortshagen. "Inductively Coupled Nonthermal Plasma Synthesis of Size-Controlled γ-Al2O3 Nanocrystals." Nanomaterials 13, no. 10 (May 12, 2023): 1627. http://dx.doi.org/10.3390/nano13101627.

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Gamma alumina (γ-Al2O3) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of γ-Al2O3 nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-step synthesis of size-controlled and monodisperse, facetted γ-Al2O3 nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors. Under optimized conditions, we observed phase-pure, cuboctahedral γ-Al2O3 nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO6, AlO5 and AlO4 units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for γ-Al2O3.

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5

Kang, Myung Jong, Na Hyeon An, and Young Soo Kang. "Magnetic and Photochemical Properties of Cu Doped Hematite Nanocrystal." Materials Science Forum 893 (March 2017): 136–43. http://dx.doi.org/10.4028/www.scientific.net/msf.893.136.

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In this report, the magnetic and photochemical properties of Cu doped hematite nanocrystal was investigated intensively. The Cu doped hematite nanocrystals were prepared by hydrothermal method, changing the molar ratio of Cu precursors. The XRD and XPS techniques are used for revealing crystal and chemical state of Cu doped hematite nanocrystal. Raman spectroscopy was also used for confirming Cu atoms replacing Fe position in Cu doped hematite crystal. The UV-vis and UPS were used for assigning electronic band position for photocatalytic properties. Cu doped hematite showed the enhanced photocatalytic properties within photodegradation of methyl orange. Finally, by checking magnetic hysteresis loops of Cu doped hematites with VSM, it was revealed that the magnetic property of Cu doped hematite nanocrystal was increased after doping Cu into hematite nanocrystal, get the distortion of magnetic sub-lattices.

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6

Harfenist, S. A., Z. L. Wang, T. G. Schaaff, and R. L. Whettent. "A BCC Superlattice of Passivated Gold Nanocrystals." Microscopy and Microanalysis 4, S2 (July 1998): 716–17. http://dx.doi.org/10.1017/s1431927600023709.

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A recent development in the study of nanocrystalline materials has been the self-assembly of passivated nanometer scale building blocks into larger, well ordered structures reaching the micron scale. Nanocrystal supercrystals (NCS) have been observed in metallic, semiconductor, and magnetic materials. In most cases the nanocrystals (NXs) are encapsulated in some inert medium that effectively protects the nanocrystal core and its unique electronic and optical properties. Here we describe the self-assembly of gold nanocrystals (∼4.5 nm core diameter), passivated with hexanethiol self-assembled-monolayers into ordered regions exhibiting a body-centered-cubic (bcc) superstructure. Transmission Electron Microscopy (TEM) imaging and Electron Diffraction (ED) experiments were used to characterize the NCSs and their resulting superstructures.A large agglomeration of NCSs can be seen in figure 1. One can clearly see regions of periodicity within the nanocrystal aggregation.

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7

Zhan, Li, Qi Wei, Geng Yanxia, Xu Junzheng, and Wu Wangsuo. "Biodistribution of60Co–Co/Graphitic-Shell NanocrystalsIn Vivo." Journal of Nanomaterials 2011 (2011): 1–5. http://dx.doi.org/10.1155/2011/842613.

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The magnetic nano-materials, Co/graphitic carbon- (GC-) shell nanocrystals, were madeviachemicalvapour deposition (CVD) method, and their biodistribution and excretion in mice were studied by using postintravenously (i.v.) injecting with60Co–Co/GC nanocrystals. The results showed that about 5% of Co was embedded into graphitic carbon to form multilayer Co/GC nanocrystals and the size of the particle was ~20 nm, the thickness of the nanocrystal cover layer was ~4 nm, and the core size of Co was ~14 nm. Most of the nanocrystals were accumulated in lung, liver, and spleen after 6, 12, 18, and 24 h afteri.v.with60Co–Co/GC nanocrystals. The nanoparticles were cleared rapidly from blood and closed to lower level in 10 min after injection. The60Co–Co/GC nanocrystals were eliminated slowly from body in 24 h after injection, ~6.09% of60Co–Co/GC nanocrystals were excreted by urine, ~1.85% by feces in 24 h, and the total excretion was less than 10%.

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8

Lin, Fang Hsin, and Reuy An Doong. "Synthesis of Ferrite Nanoparticle and Ferrite-Gold Heterostructures." Advanced Materials Research 123-125 (August 2010): 251–55. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.251.

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The synthesis of uniform and monodispersed magnetic and optical nanocrystals has received much attention in recent years due to the size-dependent physicochemical properties. In this study, we have demonstrated a general approach for the synthesis of size-tunable ferrite and gold nanocrystals and their nanocomposite. The monodispersed magnetite nanocrystals were obtained by thermal decomposition of iron-oleate complex in a high boiling point solvent in presence of oleylamine and oleic acid. The size of magnetite nanocrystal can be tuned from 7 – 11nm by changing the amount of iron-oleate complex. The other key parameters such as temperature, amount of capping agents, types of solvent were also discussed. This synthetic procedure could also apply to synthesis other type of ferrite nanocrystals. When Mn-acetate was partially substituted for iron-oleate in a 1:2 ratio in the same reaction conditions as in the synthesis of Fe3O4, monodispersed MnFe2O4 nanocrytals with 14nm could be obtained. Except those magnetic nanocrystals, we also synthesized various sizes of monodispersed gold nanocrystals by reducing HAuCl4 in presence of t-butylamine-borane and oleylamine. By varying the reaction temperature, the particle size could be well-tuned from 2nm to 8nm with the characteristic surface plasmon absorption between 510 and 520 nm. For Fe3O4/Au composite, it was prepared via the decomposition of iron-oleate over the surface of the Au nanoparticles. The mean size of the Fe3O4/Au nanocomposite was ∼17 nm which shows a saturation magnetization of 46.92 emu/g and absorption peak at 512nm. These composites with both magnetic and optical properties would make them very promising in the fields of biomedine and environment.

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9

Posfai, M., and R. E. Dunin-Borkowski. "Magnetic Nanocrystals in Organisms." Elements 5, no. 4 (August 1, 2009): 235–40. http://dx.doi.org/10.2113/gselements.5.4.235.

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10

Kikkawa, Shinichi. "Nanocrystals of Nitrides and Oxides." Journal of Nano Research 24 (September 2013): 16–25. http://dx.doi.org/10.4028/www.scientific.net/jnanor.24.16.

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Nanocrystals are important to attain high performance in optical & magnetic materials such as phosphors, laser emitters and information recording media. They are also required in future devices that involve magnetoresistance, logic gates, magnetic resonance and metamaterials. Nanocrystals of oxides and nitrides (and oxynitrides) were studied as nanosized powders, nanowires and dispersed granular thin films. Recent advancements of such nanocrystals prepared at Hokkaido University are introduced in this paper. Nanocrystals were prepared in transparent conducting oxides, white LED phosphor oxides and oxynitrides and magnetic iron nitride. Nanowires were grown in semiconducting gallium oxynitride and magnetic nanogranular thin films were prepared both in oxide and nitride.

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11

Hwang, J. H., V. P. Dravid, M. H. Teng, J. J. Host, B. R. Elliott, D. L. Johnson, and T. O. Mason. "Magnetic Properties of Graphitically Encapsulated Nickel Nanocrystals." Journal of Materials Research 12, no. 4 (April 1997): 1076–82. http://dx.doi.org/10.1557/jmr.1997.0150.

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Graphitically encapsulated ferromagnetic Ni nanocrystals have been synthesized via a modified tungsten arc-discharge method. By virtue of the protective graphitic coating, these nanocrystals are stable against environmental degradation, including extended exposure to strong acids. The magnetic properties of the encapsulated particles are characterized with regard to the nanoscale nature of the particles and the influence of the graphitic coating which is believed to be benign insofar as the intrinsic magnetic properties of the encapsulated nanocrystals are concerned. The Curie temperature of graphitically encapsulated Ni nanocrystals is the same as that of microcrystalline Ni. However, saturation magnetization, remanent magnetization, and coercivity of these particles are reduced, for a range of temperatures. The unique features are compared with those of unencapsulated nanocrystalline and coarse microcrystalline nickel particles.

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12

Vu, An Nang, Hien Van Nguyen, Uyen Thai Ngọc Nguyen, Nhan Chi Ha Thuc, and Hieu Van Le. "Preparation of magnetic iron Oxide coated on the surface of Cellulose nanocrystals by in-situ coprecipitation process." Science and Technology Development Journal - Natural Sciences 3, no. 4 (February 29, 2020): 271–78. http://dx.doi.org/10.32508/stdjns.v3i4.660.

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This study reported a single-step method for the fabrication of magnetic cellulose nanocrystals (MGCNCs) by coprecipitation iron oxide nanoparticle onto cellulose nanocrystals (CNCs). Cellulose nanocrystals (CNCs) were derived by hydrochloric acid hydrolysis (HCl 6 M, 25 mL/g cellulose) in the optimum condition at 90 °C for 90 min. Pure cellulose was isolated from Nypa fruticans branches, a popular tree in Vietnam. The structure and morphology of CNCs were characterized by crystallinity index, morphology and thermal stability. TEM images showed that the average fiber length of the nanocrystals was 410 nm with a diameter of 10 nm (aspect ratio of 41) and the crystallinity index of 85.2 % (by XRD). The as-prepared MGCNCs were characterized by Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction measurement (XRD), thermal gravity analysis (TGA) and vibrating sample magnetometry (VSM). The results showed that the magnetic cellulose nanocrystals absorbed about 51 % w/w on CNCs surfaces with magnetic properties and the saturation magnetization of about 24 emu/g. Possessing the biocompatibility as well as paramagnetism, the magnetic cellulose nanocrystals were promising materials for environmental treatment.

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13

Veintemillas-Verdaguer, Sabino, Marzia Marciello, Maria del Puerto Morales, Carlos J. Serna, and Manuel Andrés-Vergés. "Magnetic nanocrystals for biomedical applications." Progress in Crystal Growth and Characterization of Materials 60, no. 3-4 (September 2014): 80–86. http://dx.doi.org/10.1016/j.pcrysgrow.2014.09.002.

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14

Banerjee, I. A., L. Yu, M. Shima, T. Yoshino, H. Takeyama, T. Matsunaga, and H. Matsui. "Magnetic Nanotube Fabrication by Using Bacterial Magnetic Nanocrystals." Advanced Materials 17, no. 9 (May 2, 2005): 1128–31. http://dx.doi.org/10.1002/adma.200400724.

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15

Liu, Xian Ming, and Shao Yun Fu. "Synthesis and Magnetic Properties of Spherical NiO Nanocrystals." Solid State Phenomena 121-123 (March 2007): 1437–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.1437.

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Spherical NiO nanocrystals were obtained by thermal decomposition of the precursor obtained via a hydrothermal method using urea as precipitant and polyethylene glycol (PEG) as surfactant. The structure, morphology and magnetic properties of the products were examined by XRD, TEM, ED, IR and VSM. The results of the structure and magnetic measurements on NiO nanocrystals were discussed. The results showed that the products were nanocrystalline NiO with a diameter of 21 and 50 nm, respectively, after calcined at 300 and 500 oC. The calcined NiO nanocrystals exhibited the characteristics of weak ferromagnetism by magnetic analysis at room temperature. At low external field, the hysteresis loops exhibit low coercivity, Hc=144.7 and 200.5 Oe, for the samples calcined at 300 and 500 oC, respectively.

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16

Cheng, Shun-Jen. "Magnetic phases of magnetic polarons in diluted magnetic semiconductor nanocrystals." physica status solidi (c) 6, no. 4 (April 2009): 829–32. http://dx.doi.org/10.1002/pssc.200880596.

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17

Privitera, Alberto, Marcello Righetto, Renato Bozio, and Lorenzo Franco. "The central role of ligands in electron transfer from perovskite nanocrystals." MRS Advances 2, no. 43 (2017): 2327–35. http://dx.doi.org/10.1557/adv.2017.302.

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ABSTRACTThe nanoscale miniaturization of hybrid organic-inorganic perovskite has given rise to new functionalities, but the full understanding of the multifaceted properties of perovskite nanostructures is still incomplete. Using a combination of optical and magnetic resonance (EPR) spectroscopies, we focused our investigation on the photoinduced electron transfer process taking place in perovskite nanocrystals blended with the fullerene derivative PCBM. In particular we analyzed the different effect of two types of nanocrystal ligands, namely octylamine and oleylamine, on the photoinduced processes. The electron transfer process resulted in efficient fluorescence quenching in a mixed solution and in the formation of charges (PCBM anions) detected by EPR in the blends. Both the optical and EPR techniques revealed a stronger effect when the shorter ligand is present. Finally, pulsed EPR demonstrated the stabilization of the photogenerated charges in proximity of perovskite nanocrystals.

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18

Yee, Ying Chuin, Rokiah Hashim, Ahmad Ramli Mohd Yahya, and Yazmin Bustami. "Colorimetric Analysis of Glucose Oxidase-Magnetic Cellulose Nanocrystals (CNCs) for Glucose Detection." Sensors 19, no. 11 (May 31, 2019): 2511. http://dx.doi.org/10.3390/s19112511.

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Glucose oxidase (EC 1.1.3.4) sensors that have been developed and widely used for glucose monitoring have generally relied on electrochemical principle. In this study, the potential use of colorimetric method for glucose detection utilizing glucose oxidase-magnetic cellulose nanocrystals (CNCs) is explored. Magnetic cellulose nanocrystals (magnetic CNCs) were fabricated using iron oxide nanoparticles (IONPs) and cellulose nanocrystals (CNCs) via electrostatic self-assembly technique. Glucose oxidase was successfully immobilized on magnetic CNCs using carbodiimide-coupling reaction. About 33% of GOx was successfully attached on magnetic CNCs, and the affinity of GOx-magnetic CNCs to glucose molecules was slightly higher than free enzymes. Furthermore, immobilization does not affect the specificity of GOx-magnetic CNCs towards glucose and can detect glucose from 0.25 mM to 2.5 mM. Apart from that, GOx-magnetic CNCs stored at 4 °C for 4 weeks retained 70% of its initial activity and can be recycled for at least ten consecutive cycles.

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19

Wu, Hsi Chin, J. Y. Lin, and Tzu Wei Wang. "Development of Mesoporous Magnetic Hydroxyapatite Nanocrystals." Materials Science Forum 916 (March 2018): 161–65. http://dx.doi.org/10.4028/www.scientific.net/msf.916.161.

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Mesoporous magnetic hydroxyapatite nanocrystals (MPmHAp NCs) were successfully prepared through one-step co-precipitate process. From the results, the MPmHAp NCs kept HAp lattice structure and had short rod-like morphology with superparamagnetic property. The size of MPmHAp was 60-80 nm in length and 10-20 nm in width. It also had excellent cell viability when coculture with 3T3 cells in vitro. In addition, MPmHAp NCs not only possessed mesoporous architecture with high surface area for effective drug loading capacity and drug release. The above results indicate that the biocompatible MPmHAp NCs showed great potential as multifunctional therapeutic nanoagent for biomedical application.

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20

Muscas, G., G. Concas, C. Cannas, A. Musinu, A. Ardu, F. Orrù, D. Fiorani, et al. "Magnetic Properties of Small Magnetite Nanocrystals." Journal of Physical Chemistry C 117, no. 44 (October 18, 2013): 23378–84. http://dx.doi.org/10.1021/jp407863s.

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21

Lisiecki, Isabelle, and Marie-Paule Pileni. "Ordering at Various Scales: Magnetic Nanocrystals." Journal of Physical Chemistry C 116, no. 1 (December 12, 2011): 3–14. http://dx.doi.org/10.1021/jp2085445.

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22

Mahdy, Iman A. "Magnetic performance of orthorhombic Mn35Ge35Te30 nanocrystals." Journal of Magnetism and Magnetic Materials 422 (January 2017): 77–83. http://dx.doi.org/10.1016/j.jmmm.2016.08.070.

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23

Chien, C. L., Gang Xiao, and S. H. Liou. "MAGNETIC PROPERTIES OF NANOCRYSTALS OF Fe." Le Journal de Physique Colloques 49, no. C8 (December 1988): C8–1821—C8–1822. http://dx.doi.org/10.1051/jphyscol:19888832.

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24

Zhou, H., A. Hofstaetter, D. M. Hofmann, and B. K. Meyer. "Magnetic resonance studies on ZnO nanocrystals." Microelectronic Engineering 66, no. 1-4 (April 2003): 59–64. http://dx.doi.org/10.1016/s0167-9317(03)00025-x.

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25

Li, Shuiming, Hongyan Zhou, Lijun Zhao, Liping Du, and Hua Yang. "Magnetic Properties of NiMnLa Ferrite Nanocrystals." Materials and Manufacturing Processes 27, no. 12 (December 2012): 1285–89. http://dx.doi.org/10.1080/10426914.2012.667898.

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26

Kuryliszyn-Kudelska, I., B. Hadžić, D. Sibera, M. Romčević, N. Romčević, U. Narkiewicz, W. Łojkowski, M. Arciszewska, and W. Dobrowolski. "Magnetic properties of ZnO(Co) nanocrystals." Journal of Alloys and Compounds 561 (June 2013): 247–51. http://dx.doi.org/10.1016/j.jallcom.2013.01.178.

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27

Jun, Young-wook, Yoon-young Jung, and Jinwoo Cheon. "Architectural Control of Magnetic Semiconductor Nanocrystals." Journal of the American Chemical Society 124, no. 4 (January 2002): 615–19. http://dx.doi.org/10.1021/ja016887w.

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CAO, L. F., M. P. WANG, D. XIE, Z. LI, and G. Y. XU. "MELTING-THERMODYNAMIC CHARACTERISTICS OF Fe, Co, Ni MAGNETIC NANOCRYSTALS." Modern Physics Letters B 19, no. 25 (November 10, 2005): 1253–60. http://dx.doi.org/10.1142/s0217984905009298.

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A simplified model that describes the size and shape dependence of melting thermodynamics of full free nanocrystals was established. Critical sizes of Fe , Co , Ni magnetic nanocrystals when the crystals keep their crystallinity were calculated and the corresponding minimum melting temperature was predicted. Theoretical predictions were consistent with experimental results.

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29

Bhattacharjee, A. K. "Nanocrystals of diluted magnetic semiconductors: Model for magnetic polaron." Physical Review B 51, no. 15 (April 15, 1995): 9912–16. http://dx.doi.org/10.1103/physrevb.51.9912.

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30

Pileni, M. P. "Magnetic Fluids: Fabrication, Magnetic Properties, and Organization of Nanocrystals." Advanced Functional Materials 11, no. 5 (October 2001): 323–36. http://dx.doi.org/10.1002/1616-3028(200110)11:5<323::aid-adfm323>3.0.co;2-j.

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31

Pileni, M. P. "Mesoscopic domains of cobalt nanocrystals." Pure and Applied Chemistry 74, no. 9 (January 1, 2002): 1707–17. http://dx.doi.org/10.1351/pac200274091707.

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In this paper, various mesoscopic structures made of cobalt nanocrystals are presented. It is demonstrated that the evaporation time and the application of an external magnetic field during the evaporation process play a major role in the shape of mesostructure obtained. Their magnetic properties change with the shape of the mesostructure.

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32

Tyagi, Sachin, Ramesh Chandra Agarwala, and Vijaya Agarwala. "Microwave Absorption and Magnetic Studies of Strontium Hexaferrites Nanoparticles Synthesized by Modified Flux Method." Journal of Nano Research 10 (April 2010): 19–27. http://dx.doi.org/10.4028/www.scientific.net/jnanor.10.19.

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M-type strontium hexaferrite nanocrystals of radar absorbing material (NRAM) i.e. SrFe12O19 were synthesized by modified flux method that combine the controlled chemical co-precipitation process for nucleation and complete uniform growth during annealing with NaCl flux. Uniform structural morphological transformation of nanocrystals from needle to hexagonal prism faces were noticed after annealing with increasing of heat treatment (HT) temperature from 800 to 1200°C for 4h. X-ray diffraction (XRD) results show the formation of various phases with increase in annealing temperature. The crystallinity and crystallite size are found to increase with increase in heat treatment temperature (15-40nm). The superparamagnetic behavior of strontium hexaferrite is confirmed by vibrating sample magnetometer (VSM) wherein it was noticed that magnetic field (10000 gauss max) did not have any effect on these materials. The transformation of magnetic properties i.e. from superparamagnetic to ferromagnetic behaviour after heating at various HT temperatures have been revealed by hysteresis loops under VSM study. The increase in saturation magnetization from 2.44 to 75.03 emu/gm is observed. Formation of ultrafine particles has been confirmed through field emission scanning electron microscope (FESEM). About 5 to10% of the needle like crystals in the ‘as synthesized’ condition were transformed to hexagonal pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. The effect of such systematic morphological transformation of nanocrystals was observed in reflection loss properties in X band (8-12 GHz). The maximum reflection loss of -20.05, -24.31, -24.16, -25.22, -25.12, -24.01 dB at 8.1, 8.6, 9.2, 9.6, 10.7, and 12 GHz respectively are observed for the material heat treated at 1200°C. A significant increment from - 6.5 to -25.22 dB at 9.6 GHz in reflection loss (RL) is noticed due to symmetric morphological growth of RAM nanocrystal during annealing.

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Ohodnicki, P., E. J. Kautz, A. Devaraj, Y. Yu, N. Aronhime, Y. Krimer, M. E. McHenry, and A. Leary. "Nanostructure and compositional segregation of soft magnetic FeNi‐based nanocomposites with multiple nanocrystalline phases." Journal of Materials Research 36, no. 1 (January 15, 2021): 105–13. http://dx.doi.org/10.1557/s43578-020-00066-5.

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AbstractSoft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co‐rich and FeNi‐based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi‐phase crystallization processes have been reported for Co‐rich alloys but relatively few have investigated FeNi‐based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi‐based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high‐resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb‐enriched shell surrounding nanocrystals.

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Jin, Yizheng, Yuping Ren, MoTao Cao, and Zhizhen Ye. "Doped Colloidal ZnO Nanocrystals." Journal of Nanomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/985326.

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Colloidal ZnO nanocrystals are promising for a wide range of applications due to the combination of unique multifunctional nature and remarkable solution processability. Doping is an effective approach of enhancing the properties of colloidal ZnO nanocrystals in well-controlled manners. In this paper, we analyzed two synthetic strategies for the doped colloidal ZnO nanocrystals, emphasizing our understanding on the critical factors associated with the high temperature and nonaqueous approach. Latest advances of three topics, bandgap engineering, n-type doping, and dilute magnetic semiconductors related to doped ZnO nanocrystals were discussed to reveal the effects of dopants on the properties of the nanocrystalline materials.

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Ершов, Н. В., Ю. П. Черненков, В. А. Лукшина, О. П. Смирнов, and Д. А. Шишкин. "Влияние температуры продолжительного отжига на структуру и магнитные свойства нанокристаллического сплава FeSiNbCuB." Физика твердого тела 63, no. 7 (2021): 834. http://dx.doi.org/10.21883/ftt.2021.07.51032.041.

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A dependence of the soft magnetic properties of the Fe73.5Si13.5Nb3Cu1B9 alloy on the temperature of annealing (Tan) carried out in air for 2 hours at temperatures from 520 to 620°C was investigated. It was shown that with Tan increasing, the magnetic hysteresis loop broadens significantly and becomes more inclined, and the Curie temperature of the amorphous matrix surrounding the α-FeSi nanocrystals decreases. The atomic structure and phase composition of the alloy samples were investigated by X-ray diffraction in transmission geometry. After annealing at temperatures of up to 580°C, nanocrystals contain predominantly D03 phase (Fe3Si stoichiometry) and have average size of about 7 nm. Their relative fraction in the alloy increases as the temperature increases due to the additional diffusion of iron from the matrix into the nanocrystals. After annealing at Tan ≥ 600°C, the average size of the nanocrystals increases, and reflections of iron boride crystals appear in the diffractograms. The deterioration of the soft magnetic properties of the Fe73.5Si13.5Nb3Cu1B9 nanocrystalline alloy, when the annealing temperature rises from 520 to 580°C, is explained by a decrease in the silicon concentration in Fe-Si nanocrystals, which leads to a growth of the constant of the magnetocrystalline anisotropy.

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Navarro-Quezada, Andrea, Katarzyna Gas, Tia Truglas, Viola Bauernfeind, Margherita Matzer, Dominik Kreil, Andreas Ney, Heiko Groiss, Maciej Sawicki, and Alberta Bonanni. "Out-of-Plane Magnetic Anisotropy in Ordered Ensembles of FeyN Nanocrystals Embedded in GaN." Materials 13, no. 15 (July 24, 2020): 3294. http://dx.doi.org/10.3390/ma13153294.

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Phase-separated semiconductors containing magnetic nanostructures are relevant systems for the realization of high-density recording media. Here, the controlled strain engineering of GaδFeN layers with FeyN embedded nanocrystals (NCs) via AlxGa1−xN buffers with different Al concentration 0<xAl<41% is presented. Through the addition of Al to the buffer, the formation of predominantly prolate-shaped ε-Fe3N NCs takes place. Already at an Al concentration xAl≈ 5% the structural properties—phase, shape, orientation—as well as the spatial distribution of the embedded NCs are modified in comparison to those grown on a GaN buffer. Although the magnetic easy axis of the cubic γ’-GayFe4−yN nanocrystals in the layer on the xAl=0% buffer lies in-plane, the easy axis of the ε-Fe3N NCs in all samples with AlxGa1−xN buffers coincides with the [0001] growth direction, leading to a sizeable out-of-plane magnetic anisotropy and opening wide perspectives for perpendicular recording based on nitride-based magnetic nanocrystals.

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Lv, Shu-Qing, Peng-Zhao Han, Xiao-Juan Zhang, and Guang-Sheng Wang. "Graphene-wrapped pine needle-like cobalt nanocrystals constructed by cobalt nanorods for efficient microwave absorption performance." RSC Advances 11, no. 50 (2021): 31499–504. http://dx.doi.org/10.1039/d1ra06050c.

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Pesic, O., M. Spasojevic, B. Jordovic, P. Spasojevic, and A. Maricic. "Effect of electrodeposition current density on the microstructure and magnetic properties of nickel-cobalt-molybdenum alloy powders." Science of Sintering 46, no. 1 (2014): 117–27. http://dx.doi.org/10.2298/sos1401117p.

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Nanostructured nickel-cobalt-molybdenum alloy powders were electrodeposited from an ammonium sulfate bath. The powders mostly consist of an amorphous phase and a very small amount of nanocrystals with an mean size of less than 3 nm. An increase in deposition current density increases the amorphous phase percentage, the density of chaotically distributed dislocations and internal microstrains in the powders, while decreasing the mean nanocrystal size. The temperature range over which the structural relaxation of the powders deposited at higher current densities occurs is shifted towards lower temperatures. A change in relative magnetic permeability during structural relaxation is higher in powders deposited at higher current densities. Powder crystallization takes place at temperatures above 700?C. The formation of the stable crystal structure causes a decrease in relative magnetic permeability.

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Asuigui, Dane Romar C., Michael C. De Siena, Rachel Fainblat, Derak James, Daniel R. Gamelin, and Sarah L. Stoll. "Giant band splittings in EuS and EuSe magnetic semiconductor nanocrystals." Chemical Communications 56, no. 43 (2020): 5843–46. http://dx.doi.org/10.1039/d0cc00994f.

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Puntes, Victor F., Kannan M. Krishnan, and A. Paul Alivisatos. "Colloidal Nanocrystal Shape and Size Control: The Case of Cobalt." Science 291, no. 5511 (March 16, 2001): 2115–17. http://dx.doi.org/10.1126/science.1058495.

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We show that a relatively simple approach for controlling the colloidal synthesis of anisotropic cadmium selenide semiconductor nanorods can be extended to the size-controlled preparation of magnetic cobalt nanorods as well as spherically shaped nanocrystals. This approach helps define a minimum feature set needed to separately control the sizes and shapes of nanocrystals. The resulting cobalt nanocrystals produce interesting two- and three-dimensional superstructures, including ribbons of nanorods.

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Zheng, Xusheng, Li Song, Shoujie Liu, Tiandou Hu, Jiafu Chen, Xing Chen, Augusto Marcelli, Muhammad Farooq Saleem, Wangsheng Chu, and Ziyu Wu. "Synthesis and magnetic properties of samarium hydroxide nanocrystals." New Journal of Chemistry 39, no. 6 (2015): 4972–76. http://dx.doi.org/10.1039/c4nj01682c.

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Liang, Xiaolu, Xianhua Wei, and Daocheng Pan. "Dilute Magnetic SemiconductorCu2FeSnS4Nanocrystals with a Novel Zincblende Structure." Journal of Nanomaterials 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/708648.

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Diluted magnetic semiconductorCu2FeSnS4nanocrystals with a novel zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+ions occupy the same position in the zincblende unit cell, and their occupancy possibilities are 1/2, 1/4, and 1/4, respectively. The nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive spectroscopy (EDS), and UV-vis-NIR absorption spectroscopy. The nanocrystals have an average size of 7.5 nm and a band gap of 1.1 eV and show a weak ferromagnetic behavior at low temperature.

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BAKER, BENJAMIN A., and JONG HYUN CHOI. "OLIGONUCLEOTIDE DNA AND RNA AS DIRECT CAPPING LIGAND FOR NANOCRYSTALS: AN EMERGING METHOD FOR BIOLOGICAL DIAGNOSTICS AND THERAPEUTICS." Nano 04, no. 04 (August 2009): 189–99. http://dx.doi.org/10.1142/s1793292009001678.

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Various types of nanocrystals have extensively demonstrated significant advantages in magnetic, chemical, catalytic, and particularly optical properties. Still, some limitations prevent these properties from being utilized for improved biological imaging, therapeutics or micro/nano-optoelectronics. A recently emerging, facile approach employing oligonucleotide DNA or RNA for direct surface passivation of nanocrystals is showing promise to bridge the gap between functional potential and realization. Oligonucleotide capping can provide hydrophilic nature, target recognition capabilities, and enhanced cellular uptake for nanocrystals, with a simplified synthesis capable of both templating and functionalizing. We overview synthesis, properties, and applications of nucleic acid templated nanocrystals and contrast these with nanocrystals synthesized by more classical capping methods. Finally, we highlight areas of research in oligonucleotide templated nanocrystals that have been largely unexplored to date, where further investigations can provide many new insights.

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Armijo, Leisha M., Yekaterina I. Brandt, Dimple Mathew, Surabhi Yadav, Salomon Maestas, Antonio C. Rivera, Nathaniel C. Cook, et al. "Iron Oxide Nanocrystals for Magnetic Hyperthermia Applications." Nanomaterials 2, no. 2 (May 7, 2012): 134–46. http://dx.doi.org/10.3390/nano2020134.

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Thiessen, Wladimir, Aliaksei Dubavik, Vladimir Lesnyak, Nikolai Gaponik, Alexander Eychmüller, and Thomas Wolff. "Amphiphilic and magnetic behavior of Fe3O4 nanocrystals." Physical Chemistry Chemical Physics 12, no. 9 (2010): 2063. http://dx.doi.org/10.1039/b917276a.

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Bhattacharyya, Sayan, D. Zitoun, and A. Gedanken. "Magnetic properties of Cd1 −xMnxTe/C nanocrystals." Nanotechnology 22, no. 7 (January 14, 2011): 075703. http://dx.doi.org/10.1088/0957-4484/22/7/075703.

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Lomanova, N. A., M. V. Tomkovich, A. V. Osipov, V. V. Panchuk, V. G. Semenov, I. V. Pleshakov, M. P. Volkov, and V. V. Gusarov. "Magnetic Properties of Bi1 – xCaxFeO3 – δ Nanocrystals." Physics of the Solid State 61, no. 12 (December 2019): 2535–41. http://dx.doi.org/10.1134/s1063783419120278.

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Zheng, X. G., H. Kubozono, H. Yamada, K. Kato, Y. Ishiwata, and C. N. Xu. "Giant negative thermal expansion in magnetic nanocrystals." Nature Nanotechnology 3, no. 12 (October 19, 2008): 724–26. http://dx.doi.org/10.1038/nnano.2008.309.

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Xiong, Gang, and Zhen Hong Mai. "Preparation and magnetic properties of Ba2Co2Fe28O46 nanocrystals." Journal of Applied Physics 88, no. 1 (July 2000): 519–23. http://dx.doi.org/10.1063/1.373689.

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Giacometti, M., C. Rinaldi, M. Monticelli, L. Callegari, A. Collovini, D. Petti, G. Ferrari, and R. Bertacco. "Electrical and magnetic properties of hemozoin nanocrystals." Applied Physics Letters 113, no. 20 (November 12, 2018): 203703. http://dx.doi.org/10.1063/1.5050062.

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