Bi-component inorganic oxide nanofibers from gas jet fiber spinning process

RSC Advances ◽  
2015 ◽  
Vol 5 (127) ◽  
pp. 105313-105318 ◽  
Author(s):  
Monoj Ghosh ◽  
Sadhan C. Jana
Keyword(s):  
Metal Oxide ◽  
Fiber Spinning ◽  
Gas Jet ◽  
Core Shell ◽  
Inorganic Oxide ◽  
Spinning Process ◽  
Fiber Process ◽  
Semiconducting Metal Oxide

Bi-component semiconducting metal oxide nanofibers with core–shell and side-by-side morphologies in mesoporous or solid cylindrical shapes are produced by gas-jet fiber process.

Bicomponent nanofibers from core–shell nozzle in gas jet spinning process

2020 ◽  
Vol 137 (27) ◽  
pp. 48901
Author(s):  
Sepideh Niknezhad ◽  
Sadhan C. Jana
Keyword(s):  
Gas Jet ◽  
Core Shell ◽  
Spinning Process

scholarly journals Fabrication of Hollow and Porous Tin-Doped Indium Oxide Nanofibers and Microtubes via a Gas Jet Fiber Spinning Process

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1539 ◽  
Author(s):  
Monoj Ghosh ◽  
Sadhan C. Jana
Keyword(s):  
Indium Oxide ◽  
Strong Dependence ◽  
Precursor Solution ◽  
Fiber Spinning ◽  
Gas Jet ◽  
Stannic Chloride ◽  
Slow Heating ◽  
Heating Rates ◽  
Indium Chloride ◽  
Spinning Process

We report the morphologies of tin-doped indium oxide (ITO) hollow microtubes and porous nanofibers produced from precursor solutions of polyvinylpyrrolidone (PVP), indium chloride (InCl3), and stannic chloride (SnCl4). The polymer precursor fibers are produced via a facile gas jet fiber (GJF) spinning process and subsequently calcined to produce ITO materials. The morphology shows strong dependence on heating rate in calcination step. Solid porous ITO nanofibers result from slow heating rates while hollow tubular ITO microfibers with porous shells are produced at high heating rates when calcined at a peak temperature of 700 °C. The mechanisms of formation of different morphological forms are proposed. The ITO fibers are characterized using several microscopy tools and thermogravimetric analysis. The concentration of inorganic salts in precursor solution is identified as a key factor in determining the porosity of the shell in hollow fibers. The data presented in this paper show that GJF method may be suitable for fabrication of hollow and multi-tubular metal oxide nanofibers from other inorganic precursor materials.

Sulfur Dioxide Sensors

2021 ◽  
Keyword(s):  
Ionic Liquids ◽  
Sulfur Dioxide ◽  
Metal Oxide ◽  
Gas Sensors ◽  
Optical Sensors ◽  
Recent Progress ◽  
Amperometric Sensors ◽  
Metal Oxide Sensors ◽  
Semiconducting Metal Oxide

Recent progress on the sensing and monitoring of sulfur dioxide in the environment is presented. The sensing materials covered include potentiometric gas sensors, amperometric sensors, optical sensors involving colorimetric and fluorescence changes, sensors based on ionic liquids, semiconducting metal-oxide sensors, photoacoustic detectors and biosensors.

Rational manufacture of yolk–shell and core–shell metal oxide double layers from silica-templated coordination polymer double layers

2021 ◽  
Vol 5 (8) ◽  
pp. 3404-3412
Author(s):  
Jian Yeo ◽  
Gihyun Lee ◽  
Sujeong Lee ◽  
Moonhyun Oh
Keyword(s):  
Coordination Polymer ◽  
Metal Oxide ◽  
Double Layers ◽  
Core Shell ◽  
Hybrid Metal Oxide

Yolk–shell and core–shell hybrid metal oxide double layers with varied metal compositions are rationally constructed via simple calcination of silica-templated coordination polymer double layers.

Hierarchical Fe-Mn binary metal oxide core-shell nano-polyhedron as bifunctional electrocatalyst for efficient water splitting

2021 ◽  
Author(s):  
Yun-Wu Li ◽  
Shi-Kun Su ◽  
Cai-Zhen Yue ◽  
Jun Shu ◽  
Pengfang Zhang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Energy Crisis ◽  
Core Shell ◽  
Bifunctional Electrocatalyst ◽  
Binary Metal ◽  
Bifunctional Electrocatalysts ◽  
Binary Metal Oxide ◽  
Electrochemical Water Splitting

Electrochemical water splitting is convinced as one of the most promising solutions to combat energy crisis. The exploitation of efficient hydrogen and oxygen evolution reactions (HER/OER) bifunctional electrocatalysts is undoubtedly...

scholarly journals Hierarchical spidroin micellar nanoparticles as the fundamental precursors of spider silks

2018 ◽  
Vol 115 (45) ◽  
pp. 11507-11512 ◽  
Author(s):  
Lucas R. Parent ◽  
David Onofrei ◽  
Dian Xu ◽  
Dillan Stengel ◽  
John D. Roehling ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Spider Silk ◽  
Fiber Spinning ◽  
Fiber Formation ◽  
Natural Material ◽  
Physical Form ◽  
Spinning Process ◽  
Black Widow Spiders ◽  
Spider Silks

Many natural silks produced by spiders and insects are unique materials in their exceptional toughness and tensile strength, while being lightweight and biodegradable–properties that are currently unparalleled in synthetic materials. Myriad approaches have been attempted to prepare artificial silks from recombinant spider silk spidroins but have each failed to achieve the advantageous properties of the natural material. This is because of an incomplete understanding of the in vivo spidroin-to-fiber spinning process and, particularly, because of a lack of knowledge of the true morphological nature of spidroin nanostructures in the precursor dope solution and the mechanisms by which these nanostructures transform into micrometer-scale silk fibers. Herein we determine the physical form of the natural spidroin precursor nanostructures stored within spider glands that seed the formation of their silks and reveal the fundamental structural transformations that occur during the initial stages of extrusion en route to fiber formation. Using a combination of solution phase diffusion NMR and cryogenic transmission electron microscopy (cryo-TEM), we reveal direct evidence that the concentrated spidroin proteins are stored in the silk glands of black widow spiders as complex, hierarchical nanoassemblies (∼300 nm diameter) that are composed of micellar subdomains, substructures that themselves are engaged in the initial nanoscale transformations that occur in response to shear. We find that the established micelle theory of silk fiber precursor storage is incomplete and that the first steps toward liquid crystalline organization during silk spinning involve the fibrillization of nanoscale hierarchical micelle subdomains.

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