Preparation of silica fibers and non-woven cloth by electrospinning

Iimura, Kenji; Oi, Toshiyuki; Suzuki, Michitaka; Hirota, Mitsuaki

doi:10.1016/j.apt.2009.11.006

Cited by 27 publications

(24 citation statements)

References 16 publications

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“…It clearly showed the BET surface area increased from 5.35 to 45.23 m 2 g -1 with the increasing of the salt contents, which were comparable with previous reported self-stranding silica nanofibers. [44][45][46] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 16 NPs content, in which the NiFe@SNM-8 exhibited the maximum pore volume of 0.069 cm 3 g -1 .…”

Section: Methodsmentioning

confidence: 98%

Nickel Ferrite Nanoparticles Anchored onto Silica Nanofibers for Designing Magnetic and Flexible Nanofibrous Membranes

Hong

Yan

et al. 2015

ACS Appl. Mater. Interfaces

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Many applications proposed for magnetic silica nanofibers require their assembly into a cellular membrane structure. The feature to keep structure stable upon large deformation is crucial for a macroscopic porous material which functions reliably. However, it remains a key issue to realize robust flexibility in two-dimensional (2D) magnetic silica nanofibrous networks. Here, we report that the combination of electrospun silica nanofibers with zein dip-coating can lead to the formation of flexible, magnetic, and hierarchical porous silica nanofibrous membranes (SNM). The 290 nm diameter silica nanofibers act as templates for the uniform anchoring of nickel ferrite nanoparticles (size of 50 nm). Benefiting from the homogeneous and stable nanofiber-nanoparticle composite structure, the resulting magnetic SNM can maintain their structure integrity under repeated bending as high as 180° and can facilely recover. The unique hierarchical structure also provides this new class of silica membrane with integrated properties of ultralow density, high porosity, large surface area, good magnetic responsiveness, robust dye adsorption capacity, and effective emulsion separation performance. Significantly, the synthesis of such fascinating membranes may provide new insight for further application of silica in a self-supporting, structurally adaptive, and 2D membrane form.

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Section: Methodsmentioning

confidence: 98%

Nickel Ferrite Nanoparticles Anchored onto Silica Nanofibers for Designing Magnetic and Flexible Nanofibrous Membranes

Hong

Yan

et al. 2015

ACS Appl. Mater. Interfaces

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“…Our results indicate that the optimal viscosity for electrospinning polymer-free silica is in the range of 2 to 4 mPa·s. This is significantly lower that the optimal viscosity range (200-800 mPa·s) for electrospinning reported (29) for carrier-polymer-free silica sols. This is also different than the optimal electrospinning viscosity range reported for polymeric solutions.…”

Section: Resultsmentioning

confidence: 66%

“…In 2003, Choi et al demonstrated that silica could be electrospun without the addition of a carrier polymer (27). Further work by Iimura, et al demonstrated that the TEOS:water ratio was crucial in these carrier polymer-free films; if it was too high the sols were too viscous for the electrospinning process (29). In both works, an acidic catalyst was used during sol synthesis because it promoted the formation of linearized silica chains which Choi et al contend is advantageous for electrospinning (27).…”

Section: Introductionmentioning

confidence: 97%

Electrospun Silica Nanofiber Mats

Freyer

Savage

2014

ACS Symposium Series

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Electrospun nanofiber mats were prepared from low-viscosity sol-gel silica without the addition of a carrier polymer. Silica sols synthesized from tetraethyl orthosilicate (TEOS) under acidic conditions were electrospun into nanofibers in the viscosity range of 2 to 4 mPa·s. The influence of ethanol and water concentrations on the viscosity of as-synthesized and aged silica sols was also determined. Nanofibers produced from as-synthesized sols with a TEOS:H 2 O ratio of 1:2 ranged in diameter from 50 nm to 200 nm. Increases in viscosity, whether due to aging or increased water concentration in the sol resulted in fragmented nanofibers. Nanofiber mats used as the stationary phase for thin layer chromatography (TLC) were able to separate components of a test dye mixture.

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“…This can be attributed to the brittleness of gel which differs vastly from the silica fiber with cotton or wool-like tactile as found in our previous work. 13) In order to give fibers flexibility modifying tactile, silicon was employed into the system. Figure 3 shows the viscosities of solution as a function of reaction time for three different compositions.…”

Section: Resultsmentioning

confidence: 99%

“…12) Then the solution was reacted under gentle mixing with magnetic stirring at ambient temperature introducing humidified air of 90% relative humidity, controlled by potassium chloride saturated aqueous solution, at the flow rate of 300 ml/min. 13) Although the detailed mechanism is still unclear, the employment of humidified air could drastically decrease the reaction time. 12) And it is also notable that the onset amount of water, including originated from concentrated hydrochloric acid, was fixed to be unity based on the atomic ratio to the total amount of alkoxide, both TTIP and TEOS, to obtain spinnable sol.…”

Section: Methodsmentioning

confidence: 99%

Preparation of purely inorganic silica doped titania fibers via electrospinning

Iimura¹,

Oi²,

Kikuchi³

et al. 2014

J. Ceram. Soc. Japan

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The preparation technique to obtain purely inorganic silica doped titania fibers using electrospinning together with solgel method was proposed. For the system without silicon doping, fibers were too brittle to form long fiber. And it was clarified that small amount of doped silicon could modify the flexibility of fibers drastically and long fibers with appropriate mechanical property could be obtained. After calcination at 500°C for 2 h anatase phase was appeared and the specific surface area of fibers with composition of [Ti]/[Si] = 6 showed highest value 71.9 m 2 /g among all the samples tested, which is even higher than typical fine particles. The result of decomposition experiment of Rhodamine B dye solution showed that the silica doped titania fiber has adequate photocatalytic activity to decompose organic matters.

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Preparation of silica fibers and non-woven cloth by electrospinning

Cited by 27 publications

References 16 publications

Nickel Ferrite Nanoparticles Anchored onto Silica Nanofibers for Designing Magnetic and Flexible Nanofibrous Membranes

Nickel Ferrite Nanoparticles Anchored onto Silica Nanofibers for Designing Magnetic and Flexible Nanofibrous Membranes

Electrospun Silica Nanofiber Mats

Preparation of purely inorganic silica doped titania fibers via electrospinning

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