A novel method for preparing ultra-fine alumina-borate oxide fibres via an electrospinning technique

Dai, Hailu; Gong, Jian; Kim, Hakyong; Lee, Douk-Rae

doi:10.1088/0957-4484/13/5/327

Cited by 217 publications

(106 citation statements)

References 20 publications

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“…3 The feasibility to construct long and continuous polymeric, [4][5][6] ceramic, 7 and composite 8 nanofibers as well as nanotubes 9 with diameters less than 100 nm has been demonstrated using electrospinning. Typical applications include bioscaffolding, 10 wound dressing, 11 and filtrations 12 to name a few.…”

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confidence: 99%

Near-Field Electrospinning

et al. 2006

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A near-field electrospinning (NFES) process has been developed to deposit solid nanofibers in a direct, continuous, and controllable manner. A tungsten electrode with tip diameter of 25 µm is used to construct nanofibers of 50−500 nm line width on silicon-based collectors while the liquid polymer solution is supplied in a manner analogous to that of a dip pen. The minimum applied bias voltage is 600 V, and minimum electrode-to-collector distance is 500 µm to achieve position controllable deposition. Charged nanofibers can be orderly collected, making NFES a potential tool in direct write nanofabrication for a variety of materials.Electrically driven liquid jets and the stability of electrically charged droplets have been studied for hundreds of years, 1,2 while the practical apparatus of electrospinning, in which a charged jet of polymer solution is deposited onto a collector under the influence of an electrical field, dated back in 1934. 3 The feasibility to construct long and continuous polymeric, 4-6 ceramic, 7 and composite 8 nanofibers as well as nanotubes 9 with diameters less than 100 nm has been demonstrated using electrospinning. Typical applications include bioscaffolding, 10 wound dressing, 11 and filtrations 12 to name a few. Researchers have further explored the possibilities of using electrospun nanofibers in fabricating micro-and nanodevices such as field effect transistors, 13 gas 14 and optical sensors, 15 and deposition of DNA on functional chips. 16 In these and other applications, the controllability of the electrospinning process is critical. Unfortunately, current setup of electrospinning is unstable in nature as it relies on the chaotic whipping of liquid jets to generate nanofibers. Limited works toward the control of electrospinning have emerged, including aligning nanofibers by electrical field 17 and using rotational mechanical mandrels. 18,19 Furthermore, numerous investigations by means of analytical and experimental methodologies have been conducted to study the fundamental physics and chemistry of electrospinning for further improvement and control, such as the effects of polymer solution concentration, applied voltage, and electrode-to-collector distance. 4,[20][21][22] Here we report experiments of controllable electrospinning based on a new type of "near-field" electrospinning (NFES). Figure 1A illustrates the schematic setup of NFES that merges several disparate concepts. First, the electrode-to-collector distance, h, is in the range of 500 µm to 3 mm to utilize the stable liquid jets region for controllable deposition. Second, a solid tungsten spinneret of 25 µm tip diameter as illustrated in Figure 1B is used in NFES to achieve nanofibers with sub-100-nm resolution. Third, the applied electrostatic voltage is reduced due to the short electrode-to-collector distance while the electrical field in the tip region maintains the strength in the range of 10 7 V/m as those used in conventional electrospinning to activate the process. Fourth, discrete droplets of polymer solu...

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confidence: 99%

Near-Field Electrospinning

et al. 2006

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“…The fabrication of such nanostructured materials in well-defined and monodispersed forms with controlled length scales has been a major challenge in materials science and engineering. Recently, electrostatic spinning [3,4] has been shown to be an efficient and facile method to prepare fine fibers and, following the use of pyrolytic techniques, has been used to make carbon, [5] silica, [6] alumina borate, [7] titania, [8,9] alumina, [10] niobium oxide, [11] and some composite fibers such as nickel ferrite. [12] However, we are unaware of any research on the fabrication of non-oxide ceramics via electrostatic spinning of polymeric precursors.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Boron‐Carbide/Carbon Nanofibers from a Poly(norbornenyldecaborane) Single‐Source Precursor via Electrostatic Spinning

et al. 2005

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glass in this work is lower than that of phosphate glass. According to the investigation by Weyl, [6] the above results are on account of the multiabsorption of V 4+ and V 3+ . If one could adjust the composition and modify the procedure properly, more V 3+ and V 4+ states could be converted into the V 5+ state, and the transmission of the vanadate glass would likely be much better. In summary, a novel vanadate glass with remarkable optical transmission was fabricated for the first time. The vanadate glass used in this experiment is suitable for optical applications. Furthermore, when doped with neodymium, it demonstrated quite encouraging laser properties. The results indicated the feasibility of utilizing the novel transparent vanadate glasses in optics, especially in laser-related fiber optics. ExperimentalThe glass samples were prepared from high purity materials. The composition of the sample materials was carefully monitored and the experimental conditions were controlled to obtain a higher concentration of V 5+ in the glass samples. After hundreds of experiments, the glass was developed from the traditional binary composition to a quaternary one: 28V 2 O 5 ±22SiO 2 ±23MO (CaO, BaO, SrO)±27X 2 O (Na 2 O, K 2 O, Cs 2 O) in weight percentage. The batch materials were melted in a platinum crucible inside a silica tube heated by a medium induction furnace. Oxygen gas of 99.99% purity was introduced into the silica tube throughout the whole melting process. The crucible was heated at 1650 K for 2 h. The melted substances were then cast in a graphite mould and annealed. All the samples were fabricated to the size of 25 mm 20 mm 5 mm and optically polished.The absorption spectra were measured using a HITACHI330 spectrometer at room temperature (295 K). The IR spectra were measured using a SHIMADZU RF±5301PC at room temperature. The emission spectra were obtained by exciting the samples with an 805 nm diode laser. The light from the light source was chopped at 80 Hz and focused onto the 5 mm 25 mm faces of the samples. One millimeter from the edge was excited to minimize the re-absorption of the emission. The emission from the samples was focused to a monochrometer and detected by a germanium detector. The signal was intensified with a lock-in amplifier and processed by a computer.The fluorescence lifetime was measured by exciting the samples with a xenon lamp and detected by an S-1 photomultiplier tube. The fluorescence decay curves were recorded and averaged by a computer-controlled transient digitizer. The stimulated-emission cross-section of the neodymium-doped vanadate glass was calculated according to the Judd±Ofelt theory [9,10].

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“…Dai et al have reported the synthesis of alumina-borate composite fibers by electrospinning, starting from a mixture of aluminum acetate stabilized with boric acid in 10% aqueous solution of PVA, followed by calcination. 9) They obtained fibers thicker than 0.5 μm upon firing the composite up to 1400°C.…”

Section: )3)mentioning

confidence: 99%

Electrospun fibers composed of Al2O3-TiO2 nanocrystals

Nakata

Watanabe

Yuda

et al. 2009

J. Ceram. Soc. Japan

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Electrospun Al2O3-TiO2 composite fibers were fabricated and characterized. Morphologies of the fibers after calcination at 500, 1000 and 1150°C, respectively, were examined by SEM, which showed that the diameters of the fibers decreased with increasing calcination temperature. XRD and TGA/DTA revealed that the Al2O3-TiO2 fibers consisted of α-Al2O3 and rutile TiO2 phases after calcination above 1150°C. FE-SEM images showed that the Al2O3-TiO2 composite was consisted of both small round particles and large block-like ones, which were assigned as α-Al2O3 and rutile TiO2 crystals, respectively. The Al2O3-TiO2 fibers displayed a photocatalytic reaction to decompose acetaldehyde under UV irradiation.

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A novel method for preparing ultra-fine alumina-borate oxide fibres via an electrospinning technique

Cited by 217 publications

References 20 publications

Near-Field Electrospinning

Near-Field Electrospinning

Preparation of Boron‐Carbide/Carbon Nanofibers from a Poly(norbornenyldecaborane) Single‐Source Precursor via Electrostatic Spinning

Electrospun fibers composed of Al2O3-TiO2 nanocrystals

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