Fabricating fiber, rice and leaf-shaped TiO2 by tuning the chemistry between TiO2 and the polymer during electrospinning

Anjusree, G. S.; Bhupathi, Arun; Balakrishnan, Avinash; Vadukumpully, Sajini; Subramanian, K. R. V.; Sivakumar, N.; Ramakrishna, Seeram; Nair, Shantikumar V.; Nair, A. Sreekumaran

doi:10.1039/c3ra42250j

Cited by 26 publications

(14 citation statements)

References 39 publications

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“…Nature offers a variety of surfaces with brilliant properties and is a source of inspiration for numerous applications and techniques. A number of researchers have paid close attention to the fantastic surfaces triggered by nature, such as the anisotropy of the rice leaves [1,2], the self-cleaning of the lotus leaves [3][4][5], the antireflection of moth eyes [6][7][8], the fog collection system in cactus [9,10], the reversible adhesive of the gecko feet [11,12], the superhydrophobicity of the water strider legs [13,14], and the iridescence of the butterfly wings [15][16][17]. Mimicking or studying the basic principles of the sophisticated tactics from nature is of significant importance for the design of artificial analogs.…”

Section: Introductionmentioning

confidence: 99%

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

Han¹,

Li²,

Mu³

et al. 2016

Nano Online

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Based on the super light trapping property of butterfly Trogonoptera brookiana wings, the SiO 2 replica of this bionic functional surface was successfully synthesized using a simple and highly effective synthesis method combining a sol-gel process and subsequent selective etching. Firstly, the reflectivity of butterfly wing scales was carefully examined. It was found that the whole reflectance spectroscopy of the butterfly wings showed a lower level (less than 10 %) in the visible spectrum. Thus, it was confirmed that the butterfly wings possessed a super light trapping effect. Afterwards, the morphologies and detailed architectures of the butterfly wing scales were carefully investigated using the ultra-depth three-dimensional (3D) microscope and field emission scanning electronic microscopy (FESEM). It was composed by the parallel ridges and quasi-honeycomb-like structure between them. Based on the biological properties and function above, an exact SiO 2 negative replica was fabricated through a synthesis method combining a sol-gel process and subsequent selective etching. At last, the comparative analysis of morphology feature size and the reflectance spectroscopy between the SiO 2 negative replica and the flat plate was conducted. It could be concluded that the SiO 2 negative replica inherited not only the original super light trapping architectures, but also the super light trapping characteristics of bio-template. This work may open up an avenue for the design and fabrication of super light trapping materials and encourage people to look for more super light trapping architectures in nature.

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Section: Introductionmentioning

confidence: 99%

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

Han¹,

Li²,

Mu³

et al. 2016

Nano Online

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“…[1][2][3][4][5] The working fluid 20 in a traditional single fluid electrospinning process is often a mixed solution of an active ingredient and a filament-forming polymer; suspensions of functional nanoparticles may also be used. [6][7][8][9][10] The active ingredient must have sufficient solubility in the chosen solvent to give an effective therapeutic dose in the 25 patient.…”

Section: Introductionmentioning

confidence: 99%

Electrospun acid–base pair solid dispersions of quercetin

Yan

et al. 2014

RSC Adv.

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An electrospun acid-base pair solid dispersion in the form of core-shell nanofibers was developed for improving the dissolution of quercetin (8 cm× 4 cm, 600 dpi)In this work, electrospinning was used to fabricate core-shell nanofibers containing acid-base pairs. Quercetin was used as a model active ingredient. To exploit its solubility in basic conditions, a solution of quercetin, polyvinylpyrrolidone (PVP) and sodium hydroxide was used as the core fluid, and one consisting of citric acid and PVP as the shell fluid. Scanning and transmission electron microscopy demonstrated that core-shell nanofibers with linear morphologies were obtained, without beads or 10 spindles. X-ray diffraction showed that quercetin was present in the fibers in an amorphous state; Fourier transform infrared spectroscopy indicated this may be a result of hydrogen bonding between the drug and the polymer matrix. In in vitro dissolution tests the drug was found to be released immediately when the fibers encountered an aqeuous medium. There was no change in the pH of the medium after dissolution, as a result of the presence of the acid-base pair. This provides a new strategy for improving the 15 dissolution behavior of poorly water-soluble drugs using polymeric nanostructures.

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“…After optimization, we found that a concentration of 0.1 g/mL was optimal for the density and the size of nanofiber (Supplementary Figure S1). Polyvinyl acetate (PVA) was also tested, but because of the low degree of bonding with titanium (IV) isopropoxide1920, the surfaces of nanofibers after firing were not smooth and the nanofibers were shorter (Supplementary Figure S2). Before electrospinning, the polymer mixture was stirred vigorously at room temperature for 24 h. A high voltage power supply (eS-robot ® ) was used to provide voltages of 15–20 kV for electrospinning.…”

Section: Methodsmentioning

confidence: 99%

“…Instead, a high voltage power supply, a spinneret containing a polymer solution, and a collector are required. This technique is widely used to fabricate nanofibers, nano/meso composites, core-shell materials, and hollow configurations1819. Zhou et al 16,.…”

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confidence: 99%

High-performance spinel-rich Li1.5MnTiO4+δ ultralong nanofibers as cathode materials for Li-ion batteries

Arunkumar

2017

Sci Rep

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Recently, composite materials based on Li-Mn-Ti-O system were developed to target low cost and environmentally benign cathodes for Li-ion batteries. The spinel-layered Li1.5MnTiO4+δ bulk particles showed excellent cycle stability but poor rate performance. To address this drawback, ultralong nanofibers of a Li1.5MnTiO4+δ spinel-layered heterostructure were synthesized by electrospinning. Uniform nanofibers with diameters of about 80 nm were formed of tiny octahedral particles wrapped together into 30 μm long fibers. The Li1.5MnTiO4+δ nanofibers exhibited an improved rate capability compared to both Li1.5MnTiO4+δ nanoparticles and bulk particles. The uniform one-dimensional nanostructure of the composite cathode exhibited enhanced capacities of 235 and 170 mAh g−1 at C/5 and 1 C rates, respectively. Its unique structure provided a large effective contact area for Li+ diffusion, and low charge transfer resistance. Moreover, the layered phase contributed to its capacity in over 3 V region, which increased specific energy (726 Wh kg−1) compared to the bulk particles (534 Wh kg−1).

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Fabricating fiber, rice and leaf-shaped TiO2 by tuning the chemistry between TiO2 and the polymer during electrospinning

Cited by 26 publications

References 39 publications

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

An Ingenious Super Light Trapping Surface Templated from Butterfly Wing Scales

Electrospun acid–base pair solid dispersions of quercetin

High-performance spinel-rich Li1.5MnTiO4+δ ultralong nanofibers as cathode materials for Li-ion batteries

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