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Journal articles on the topic 'Soft magnetic nanofibers'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Liao, Yuan, Shu Hua Qi, Dong Hong Wang, and You Ming Wu. "Synthesis and Electromagnetic Properties of Polyaniline Nanofibers Using Polyglycol as ‘Soft’ Template in the Aqueous Ethanol." Advanced Materials Research 79-82 (August 2009): 309–12. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.309.

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In this paper Polyglycol (PG) was used as ‘soft’ template to induce the polymerization of aniline in aqueous ethanol and hence control both the nucleation and growth of polyaniline (PANI) nanofibers. The products were characterized by Transmission electro microscope (TEM) and X-ray diffraction (XRD) techniques. TEM photos showed that the diameter of PANI nanofibers synthesized in pure water is 100nm while that of PANI nanofibers synthesized in aqueous ethanol is 50nm. It revealed that the volume fraction of ethanol showed really important effect on the morphological parameters of the PANI nanofibers. The X-ray diffraction patterns of the PANI nanofibers showed high crystallinity. Moreover, the resulting PANI nanofibers exhibited an unusual electromagnetic loss at the microwave frequency (f = 8.2~12.4 GHz) . Compared with 1.79, the highest electrical loss, tanδe, of the microparticles PANI at 8.47 GHz and 0.72, the highest magnetic loss, tanδm at 10.93 GHz, it was noted that the highest electrical loss, tanδe, of PANI nanofibers reached 3.26 at 10.4 GHz, and the highest magnetic loss, tanδm, was 2.85 at 9.35 GHz. It might arise from order arrangement of polaron as charge carrier caused by nanofibers morphology and can be used for the potential application as microwave absorbing materials.

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2

Araujo, R. N., E. P. Nascimento, H. B. Sales, M. R. Silva, G. A. Neves, and R. R. Menezes. "CaFe2O4 ferrite nanofibers via solution blow spinning (SBS)." Cerâmica 66, no. 380 (December 2020): 467–73. http://dx.doi.org/10.1590/0366-69132020663802932.

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Abstract CaFe2O4 nanofibers were successfully synthesized via solution blow spinning (SBS), and the influences of heat-treatment on morphological, microstructural, magnetic, and optical properties of the nanofibers were evaluated. In the synthesis process, stoichiometric amounts of iron and calcium nitrates were dissolved in an aqueous solution containing polyvinylpyrrolidone (PVP) and, after that, hybrid nanofibers (PVP/precursors) were produced by SBS. The hybrid nanofibers were calcined and then subjected to microstructural, morphological, and magnetic characterizations. The results evidenced that the fibers presented the crystalline nature of the single-phase CaFe2O4, with a crystallite size of 32.7 and 34.4 nm for the samples calcined at 800 and 1000 °C, respectively. The CaFe2O4 fibers calcined at 600 and 800 °C presented a homogeneous morphology, without beads, and mean diameters of 521 and 427 nm, respectively. The results also revealed nanofibers with low band gaps of approximately 1.98 eV and characteristics of soft magnetic materials.

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3

Strečková, Magdaléna, Mária Fáberová, Radovan Bureš, and Pavel Kurek. "The Preparation of Soft Magnetic Composites Based on FeSi and Ferrite Fibers." Powder Metallurgy Progress 16, no. 2 (December 1, 2016): 107–16. http://dx.doi.org/10.1515/pmp-2016-0009.

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Abstract The fields of soft magnetic composites and powder metallurgy technologies have a powerful potential to redesign the way of electric motor preparation, and will continue to grow for years to come. A design of the novel soft microcomposite material composed of spherical FeSi particles and Ni0.3Zn0.7Fe2O4 ferrite nanofibers is reported together with a characterization of basic mechanical and electrical properties. The needle-less electrospinning method was used for a preparation of Ni0.3Zn0.7Fe2O4 ferrite nanofibers, which has a spinel-type crystal structure as verified by XRD and TEM analysis. The dielectric coating was prepared by mixing of nanofibers with glycerol and ethanol because of safe manipulation with fumed fibers and homogeneous distribution of the coating around the FeSi particle surface. The final microcomposite samples were prepared by a combination of the traditional PM compaction technique supplemented with a conventional sintering process of the prepared green compacts. The composition and distribution of the secondary phase formed by the spinel ferrite fibers were examined by SEM. It is demonstrated that the prepared composite material has a tight arrangement without any significant porosity, which manifest itself through superior mechanical properties (high mechanical hardness, Young modulus, and transverse rupture strength) and specific electric resistivity compared to the related composite materials including resin as the organic binder.

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4

Khunová, Viera, David Pavliňák, Ivo Šafařík, Martin Škrátek, and František Ondreáš. "Multifunctional Electrospun Nanofibers Based on Biopolymer Blends and Magnetic Tubular Halloysite for Medical Applications." Polymers 13, no. 22 (November 9, 2021): 3870. http://dx.doi.org/10.3390/polym13223870.

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Tubular halloysite (HNT) is a naturally occurring aluminosilicate clay with a unique combination of natural availability, good biocompatibility, high mechanical strength, and functionality. This study explored the effects of magnetically responsive halloysite (MHNT) on the structure, morphology, chemical composition, and magnetic and mechanical properties of electrospun nanofibers based on polycaprolactone (PCL) and gelatine (Gel) blends. MHNT was prepared via a simple modification of HNT with a perchloric-acid-stabilized magnetic fluid–methanol mixture. PCL/Gel nanofibers containing 6, 9, and 12 wt.% HNT and MHNT were prepared via an electrospinning process, respecting the essential rules for medical applications. The structure and properties of the prepared nanofibers were studied using infrared spectroscopy (ATR-FTIR) and electron microscopy (SEM, STEM) along with energy-dispersive X-ray spectroscopy (EDX), magnetometry, and mechanical analysis. It was found that the incorporation of the studied concentrations of MHNT into PCL/Gel nanofibers led to soft magnetic biocompatible materials with a saturation magnetization of 0.67 emu/g and coercivity of 15 Oe for nanofibers with 12 wt.% MHNT. Moreover, by applying both HNT and MHNT, an improvement of the nanofibers structure was observed, together with strong reinforcing effects. The greatest improvement was observed for nanofibers containing 9 wt.% MHNT when increases in tensile strength reached more than two-fold and the elongation at break reached a five-fold improvement.

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5

Barakat, Nasser A. M., Khalil A. Khalil, Ibrahim H. Mahmoud, Muzafar A. Kanjwal, Faheem A. Sheikh, and Hak Yong Kim. "CoNi Bimetallic Nanofibers by Electrospinning: Nickel-Based Soft Magnetic Material with Improved Magnetic Properties." Journal of Physical Chemistry C 114, no. 37 (August 31, 2010): 15589–93. http://dx.doi.org/10.1021/jp1041074.

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6

Dakova, L', J. Fuzer, S. Dobak, P. Kollar, Y. Osadchuk, M. Streckova, M. Faberova, R. Bures, P. Kurek, and M. Vojtko. "Analysis of Magnetic Losses and Complex Permeability in Novel Soft Magnetic Composite With Ferrite Nanofibers." IEEE Transactions on Magnetics 54, no. 12 (December 2018): 1–6. http://dx.doi.org/10.1109/tmag.2018.2866814.

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7

Dong, Juan, Yi Zhang, Xinlei Zhang, Qingfang Liu, and Jianbo Wang. "Improved magnetic properties of SrFe12O19/FeCo core–shell nanofibers by hard/soft magnetic exchange–coupling effect." Materials Letters 120 (April 2014): 9–12. http://dx.doi.org/10.1016/j.matlet.2014.01.022.

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8

Lee, Jimin, Gyutae Lee, Tae-Yeon Hwang, Hyo-Ryoung Lim, Hong-Baek Cho, Jongryoul Kim, and Yong-Ho Choa. "Phase- and Composition-Tunable Hard/Soft Magnetic Nanofibers for High-Performance Permanent Magnet." ACS Applied Nano Materials 3, no. 4 (February 17, 2020): 3244–51. http://dx.doi.org/10.1021/acsanm.9b02470.

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9

Song, Fuzhan, Xiangqian Shen, Mingquan Liu, and Jun Xiang. "Microstructure, magnetic properties and exchange–coupling interactions for one-dimensional hard/soft ferrite nanofibers." Journal of Solid State Chemistry 185 (January 2012): 31–36. http://dx.doi.org/10.1016/j.jssc.2011.10.009.

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10

Seah, Tzu Hui, and Martin Pumera. "Platelet graphite nanofibers/soft polymer composites for electrochemical sensing and biosensing." Sensors and Actuators B: Chemical 156, no. 1 (August 2011): 79–83. http://dx.doi.org/10.1016/j.snb.2011.03.075.

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11

Toprakci, Hatice A. K., Saral K. Kalanadhabhatla, Richard J. Spontak, and Tushar K. Ghosh. "Polymer Nanocomposites Containing Carbon Nanofibers as Soft Printable Sensors Exhibiting Strain-Reversible Piezoresistivity." Advanced Functional Materials 23, no. 44 (May 17, 2013): 5536–42. http://dx.doi.org/10.1002/adfm.201300034.

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12

Lan, Boling, Xiao Xiao, Aiden Di Carlo, Weili Deng, Tao Yang, Long Jin, Guo Tian, Yong Ao, Weiqing Yang, and Jun Chen. "Topological Nanofibers Enhanced Piezoelectric Membranes for Soft Bioelectronics (Adv. Funct. Mater. 49/2022)." Advanced Functional Materials 32, no. 49 (December 2022): 2270282. http://dx.doi.org/10.1002/adfm.202270282.

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13

Angarano, Marco, Simon Schulz, Martin Fabritius, Robert Vogt, Thorsten Steinberg, Pascal Tomakidi, Christian Friedrich, and Rolf Mülhaupt. "Layered Gradient Nonwovens of In Situ Crosslinked Electrospun Collagenous Nanofibers Used as Modular Scaffold Systems for Soft Tissue Regeneration." Advanced Functional Materials 23, no. 26 (February 6, 2013): 3277–85. http://dx.doi.org/10.1002/adfm.201202816.

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14

Abrougui, Mariem Mekni, Ezzeddine Srasra, Modesto T. Lopez-Lopez, and Juan D. G. Duran. "Rheology of magnetic colloids containing clusters of particle platelets and polymer nanofibres." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2171 (April 13, 2020): 20190255. http://dx.doi.org/10.1098/rsta.2019.0255.

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Magnetic hydrogels (ferrogels) are soft materials with a wide range of applications, especially in biomedicine because (i) they can be provided with the required biocompatibility; (ii) their heterogeneous structure allows their use as scaffolds for tissue engineering; (iii) their mechanical properties can be modified by changing different design parameters or by the action of magnetic fields. These characteristics confer them unique properties for acting as patterns that mimic the architecture of biological systems. In addition, and (iv) given their high porosity and aqueous content, ferrogels can be loaded with drugs and guided towards specific targets for local (non-systemic) pharmaceutical treatments. The ferrogels prepared in this work contain magnetic particles obtained by precipitation of magnetite nanoparticles onto the porous surface of bentonite platelets. Then, the particles were functionalized by adsorption of alginate molecules and dispersed in an aqueous solution of sodium alginate. Finally, the gelation was promoted by cross-linking the alginate molecules with Ca 2+ ions. The viscoelastic properties of the ferrogels were measured in the absence/presence of external magnetic fields, showing that these ferrogels exhibited a strong enough magnetorheological effect. This behaviour is explained considering the field-induced strengthening of the heterogeneous (particle–polymer) network generated inside the ferrogel. This article is part of the theme issue ‘Patterns in soft and biological matters'.

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15

Pullar, Robert C. "Hexagonal Ferrite Fibres and Nanofibres." Solid State Phenomena 241 (October 2015): 1–68. http://dx.doi.org/10.4028/www.scientific.net/ssp.241.1.

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Hexagonal ferrites, or hexaferrites, are hugely important materials commercially and technologically, with common applications as permanent magnets, magnetic recording and data storage media, components in electrical devices operating at wireless frequencies, and as GHz electromagnetic wave absorbers for EMC, RAM and stealth technologies. Hexaferrites are all ferrimagnetic materials, and their magnetic properties are intrinsically linked to their crystalline structures, all having a strong magnetocrystalline anisotropy; that is the induced magnetisation has a preferred orientation within the crystal structure. They can be divided into two main groups: those with an easy axis of magnetisation (known as uniaxial), the hard hexaferrites, and those with an easy plane (or cone) of magnetisation (known as ferroxplana or hexaplana), soft ferrites. The common hexaferrite members are:M-type ferrites, such as BaFe12O19and SrFe12O19Z-type ferrites (Ba3Me2Fe24O41)Y-type ferrites (Ba2Me2Fe12O22)W-type ferrites (BaMe2Fe16O27)X-type ferrites (Ba2Me2Fe28O46)U-type ferrites (Ba4Me2Fe36O60)where Me = a small 2+ion such as cobalt, nickel or zinc, and Ba can be fully substituted by Sr. Generally, the M ferrites are hard, the Y, Z and U ferrites are soft, and the W and X ferrites can very between these two extremes, but all have large magnetisation (M) values.There is currently increasing interest in composite materials containing hexaferrite fibres. It had been predicted that properties such as thermal and electrical conductivity, and magnetic, electrical and optical behaviour will be enhanced in material in fibrous form. This is because a continuous fine fibre can be considered as effectively one-dimensional, and it does not behave as a homogeneously distributed solid. Although the intrinsic magnetisation of the material is unaffected, the effective magnetisation of an aligned fibre sample should be greater when a field is applied parallel with fibre alignment compared to when applied perpendicularly to fibre alignment. This feature was first demonstrated by the author for aligned hexaferrite fibres in 2006. This chapter will deal with progress in the manufacture and properties of hexaferrite fibres, from the first syntheses of BaM, SrM,Co2Y,Co2Z, Co2W, Co2X and Co2U micron-scale fibres by the author 12-15 years ago, to recent developments in M ferrite hollow fibres and nanofibres, and hexaferrite-coated CNTs (carbon nanotubes).The relative properties of all reported hexaferrite fibres are compared and summarised at the end of this chapter.

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16

Füzer, J., M. Strečková, S. Dobák, Ľ. Ďáková, P. Kollár, M. Fáberová, R. Bureš, Y. Osadchuk, P. Kurek, and M. Vojtko. "Innovative ferrite nanofibres reinforced soft magnetic composite with enhanced electrical resistivity." Journal of Alloys and Compounds 753 (July 2018): 219–27. http://dx.doi.org/10.1016/j.jallcom.2018.04.237.

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17

Sinatra, N. R., T. Ranzani, J. J. Vlassak, K. K. Parker, and R. J. Wood. "Nanofiber-reinforced soft fluidic micro-actuators." Journal of Micromechanics and Microengineering 28, no. 8 (May 21, 2018): 084002. http://dx.doi.org/10.1088/1361-6439/aab373.

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18

Birčáková, Zuzana, Ján Füzer, Peter Kollár, Magdalena Streckova, Juraj Szabó, Radovan Bureš, and Mária Fáberová. "Magnetic properties of Fe-based soft magnetic composite with insulation coating by resin bonded Ni-Zn ferrite nanofibres." Journal of Magnetism and Magnetic Materials 485 (September 2019): 1–7. http://dx.doi.org/10.1016/j.jmmm.2019.04.060.

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19

Slimani, Yassine, Munirah A. Almessiere, Sadik Guner, Abdulhadi Baykal, Murat Sertkol, Fatimah S. Alahmari, Eman M. Alsulami, and Ismail A. Auwal. "An investigation on structural, optical and magnetic properties of hard-soft SrFe12O19/(CoEu0.02Fe1.98O4)x nanofiber composites." Journal of Alloys and Compounds 905 (June 2022): 164240. http://dx.doi.org/10.1016/j.jallcom.2022.164240.

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20

Gong, Junyi, Peichen Wu, Zhichuan Bai, Jianjun Ma, Tao Li, Yali Yao, and Cairong Jiang. "Insight into the Electrospinning Process for SOFC Cathode Nanofibers." Journal of Physical Chemistry C 125, no. 13 (March 26, 2021): 7044–53. http://dx.doi.org/10.1021/acs.jpcc.1c00317.

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21

D’Anniballe, Riccardo, Andrea Zucchelli, and Raffaella Carloni. "The effect of morphology on poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene)-based soft actuators: Films and electrospun aligned nanofiber mats." Sensors and Actuators A: Physical 333 (January 2022): 113255. http://dx.doi.org/10.1016/j.sna.2021.113255.

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22

Lan, Boling, Xiao Xiao, Aiden Di Carlo, Weili Deng, Tao Yang, Long Jin, Guo Tian, Yong Ao, Weiqing Yang, and Jun Chen. "Topological Nanofibers Enhanced Piezoelectric Membranes for Soft Bioelectronics." Advanced Functional Materials, September 30, 2022, 2207393. http://dx.doi.org/10.1002/adfm.202207393.

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23

Yan, Guihua, Shuaiming He, Gaofeng Chen, Sen Ma, Anqi Zeng, Binglin Chen, Shuliang Yang, et al. "Highly Flexible and Broad-Range Mechanically Tunable All-Wood Hydrogels with Nanoscale Channels via the Hofmeister Effect for Human Motion Monitoring." Nano-Micro Letters 14, no. 1 (March 29, 2022). http://dx.doi.org/10.1007/s40820-022-00827-3.

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AbstractWood-based hydrogel with a unique anisotropic structure is an attractive soft material, but the presence of rigid crystalline cellulose in natural wood makes the hydrogel less flexible. In this study, an all-wood hydrogel was constructed by cross-linking cellulose fibers, polyvinyl alcohol (PVA) chains, and lignin molecules through the Hofmeister effect. The all-wood hydrogel shows a high tensile strength of 36.5 MPa and a strain up to ~ 438% in the longitudinal direction, which is much higher than its tensile strength (~ 2.6 MPa) and strain (~ 198%) in the radial direction, respectively. The high mechanical strength of all-wood hydrogels is mainly attributed to the strong hydrogen bonding, physical entanglement, and van der Waals forces between lignin molecules, cellulose nanofibers, and PVA chains. Thanks to its excellent flexibility, good conductivity, and sensitivity, the all-wood hydrogel can accurately distinguish diverse macroscale or subtle human movements, including finger flexion, pulse, and swallowing behavior. In particular, when “An Qi” was called four times within 15 s, two variations of the pronunciation could be identified. With recyclable, biodegradable, and adjustable mechanical properties, the all-wood hydrogel is a multifunctional soft material with promising applications, such as human motion monitoring, tissue engineering, and robotics materials.

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24

Cho, Sumin, Sunmin Jang, Donghan Lee, Yoonsang Ra, Dongik Kam, Jong Woo Kim, Dongjin Shin, Kyoung Duck Seo, and Dongwhi Choi. "Self-Powered Hybrid Triboelectric–Piezoelectric Electronic Skin Based on P(VDF-TrFE) Electrospun Nanofibers for Artificial Sensory System." Functional Composites and Structures, November 8, 2022. http://dx.doi.org/10.1088/2631-6331/aca139.

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Abstract Piezoelectric sensors have been developed due to the self-powered sensing and flexibility and the promising potential applications in the electronic skin (e-skin) inspired by human skin. However, although the piezoelectric sensors have an excellent performance in detecting human movements, it is difficult to distinguish external mechanical stimuli such as tapping in a single structure, together. Here, we suggest a self-powered e-skin based on electrospun poly (vinylidene fluoride-trifluoroethylene), P(VDF-TrFE), nanofiber hybrid triboelectric-piezoelectric sensor (E-HTPS), that can identify between human motions and external touch based on both triboelectric effect and piezoelectric effect. Triboelectric effect-based sensors have a good electrical output characteristic with various advantages of high-flexibility and simple working operation. Hence, the E-HTPS consists of two layers, triboelectric layer as a tactile sensor and piezoelectric layer as a human motion sensor. Therefore, we demonstrate that the E-HTPS can detect human movements and even finger touch with attached to the target body part. Consequently, the E-HTPS could provide an effective approach to designing the self-powered e-skin as an artificial sensory system for healthcare monitoring and soft robotics.

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25

Huang, Danqiang, Xinchao Wen, Jianfeng Dai, Wei Feng, Hui Liu, and Zengpeng Li. "Magnetic Properties and Exchange Coupling Effects of Srfe12o19@Mfe2o4 (M=Co, Ni, Zn) as Hard-Soft Magnetic Ferrite Core-Shell Nanofibres." SSRN Electronic Journal, 2022. http://dx.doi.org/10.2139/ssrn.4184585.

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26

Hosseini, Seyedmajid, Hassan Hajghassem, and Masoud Faraghi Ghazani. "A Sensitive and Flexible Interdigitated Capacitive Strain Gauge Based on Carbon Nanofiber/PANI/Silicone Rubber Nanocomposite for Body Motion Monitoring." Materials Research Express, June 13, 2022. http://dx.doi.org/10.1088/2053-1591/ac7851.

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Abstract Stretchable nanocomposites-based strain gauges have received much attention due to their adjustable properties in various applications, including soft robotics, human health monitoring, body motion detection, structural health monitoring, and artificial intelligence. Although low sensitivity (gauge factor) is one of the challenges of capacitive strain gauges, in this study, we design, manufacture, and illustrate characterizations of a stretchable interdigitated capacitive strain gauge based on carbon nanofiber/ polyaniline/ silicone rubber nanocomposite by an improvement in sensitivity with linearity, and low hysteresis. This strain gauge reaches a gauge factor of about 14 over an applied strain of 2% and about 2.8 over an applied strain of 20% and demonstrates linearity with negligible hysteresis. The sensitivity of the strain sensor is enhanced not only by the interdigitated design of electrodes but also by the electrodes' outstanding electrical conductivity, even in a large strain. Due to its sensitivity, the proposed device is suitable for detecting small and large strains and can be used in wearable applications or straight on the skin for human motion detection.

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