Synthesis of Silica Nanotube Using Myelin Figure as Template and their Formation Mechanism

Fukamachi, Takumi; Endo, Takeshi; Yabuki, Yukinori; Ogura, Taku; Misono, Takeshi; Torigoe, Kanjiro; Sakai, Kenichi; Abe, Masahiko; Sakai, Hideki

doi:10.5650/jos.ess15029

Cited by 12 publications

(15 citation statements)

References 33 publications

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“…The exposure distance constitutes the relaxation time of amphiphilic polymer and its related quantity which absorbed to solvents interlayer or entered into water. Pluronic as an amphiphilic polymer can also agglomerate, reassemble and form a myelin layer when solved in non‐aqueous solvents (especially in chloroform) and contacted with water . Resembling mucilage, the Pluronic myelin is visible by the naked eye and remains stable at room temperature.…”

Section: Introductionmentioning

confidence: 94%

“…Amongst many methods for attaining a hydrophilized PCL‐based scaffold, bulk blending has shown ease of process, acceptable hydrophilicity in surface and bulk and without any residual chemical reagents when compared to plasma treatment and chemical surface grafting . Polyethylene oxide (PEO)–polypropylene oxide (PPO) copolymer commercially known as Pluronic, with PEO−PPO−PEO configuration, presents good miscibility when blended with most hydrophilic polymers in organic solvents and low leakage in aqueous media and therefore can be a good candidate for achieving hydrophilized scaffold . Electrospinning of linear triblock copolymer styrene‐b‐ethylenebutylene‐b‐styrene with Pluronic F127 was studied and a superhydrophilic mat was achieved.…”

Section: Introductionmentioning

confidence: 99%

“…7,8 Polyethylene oxide (PEO)-polypropylene oxide (PPO) copolymer commercially known as Pluronic, with PEO−PPO−PEO configuration, presents good miscibility when blended with most hydrophilic polymers in organic solvents and low leakage in aqueous media and therefore can be a good candidate for achieving hydrophilized scaffold. 9,10 Electrospinning of linear triblock copolymer styrene-b-ethylenebutylene-b-styrene with Pluronic F127 was studied and a superhydrophilic mat was achieved. Kurusu et al limited the concentration of hydrophilic polymer to 20 wt % as higher concentration had negative effects on jet stability and fibrous mat integrity when submerged in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

“…Pluronic as an amphiphilic polymer can also agglomerate, reassemble and form a myelin layer when solved in non-aqueous solvents (especially in chloroform) and contacted with water. 10,25 Resembling mucilage, the Pluronic myelin is visible by the naked eye and remains stable at room temperature. Furthermore, when another hydrophobic polymer such as PCL is present in chloroform, chain entanglement between PCL and reassembled Pluronic resides at the interface can retain the myelin layer after fiber formation at its surface.…”

Section: Introductionmentioning

confidence: 99%

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Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic polycaprolactone based fibers: Analysis of drug release behavior

Zargarian

Haddadi‐Asl

Kafrashian

et al. 2018

J Biomedical Materials Res

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Surface hydrophilicity and scaffold integrity determine the drug release behavior of drug loaded electrospun fibrous mats. When mixture miscibility is acceptable, blend electrospinning of hydrophobic with hydrophilic polymers can improve scaffold hydrophilicity while the hydrophobic polymer maintains the mechanical strength of scaffold. Polycaprolactone (PCL) and Pluronic P123 (P123) blend electrospinning has been investigated. In routine blend electrospinning, surface enrichment of Pluronic sets a limit for P123 weight ratio in which exceeding from that limit causes the excess P123 to be accumulated within the electrospun fiber core. To overcome this setback, a method named surfactant assisted water exposed (SAWE) electrospinning was introduced which was proven to be effective for increasing the surface enrichment of Pluronic. In order to test the validity of this method, the electrospinning of solution containing PCL which is exposed to aqueous solution of P123 was investigated. This new method was named surfactant aqueous solution exposed (SASE) electrospinning. Myelin formation at the contact interface of aqueous solution and chloroform solution was studied and it was found that this layer can effectively barricade the migration of Pluronic chains between immiscible phases. For SASE, fiber surface coverage by P123 was uneven and loose. Electrospun scaffolds from SAWE and SASE were loaded with drug to investigate the effect of the exposure time during electrospinning on in vitro drug release. By increasing the exposure time, the abnormal two‐stage phased release profile of SAWE became normal with moderate initial burst. Longer exposure time increased the initial burst of the drug loaded SASE fibers. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 597–609, 2019.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic polycaprolactone based fibers: Analysis of drug release behavior

Zargarian

Haddadi‐Asl

Kafrashian

et al. 2018

J Biomedical Materials Res

View full text Add to dashboard Cite

show abstract

“…The FSEoHP value remains equal for different weight percentages of blended polymers, conveying that fiber surface enrichment of hydrophilic polymer occurred at lower concentrations than 0.5 wt % and the excess amount of the amphiphilic polymer resides in the bulk of the electrospun fibers. Pluronic block copolymers are capable of forming an exclusive micellar conformation, known as myelin, in presence of immiscible solvents . Using the myelin conformation in our previous study, surfactant‐assisted‐water‐exposed (SAWE) novel electrospinning method was proposed, in which water jet was exposed in parallel to polymer solution.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic Polycaprolactone‐based fibers: Cell culture studies

Zargarian

Haddadi‐Asl

Azarnia

et al. 2019

J Biomedical Materials Res

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Blend electrospun scaffolds composed of Polycaprolactone and Pluronic are suitable for bone tissue engineering due to their excellent biocompatibility and hydrophilicity. However, exceeding from certain amounts of Pluronic, surface enrichment of this polymer leads to segregation of Pluronic chains within the fiber, endangering the integrity and mechanical properties of the scaffold. In this article, a novel method of blend electrospinning has been employed using a parallel water supply, positioning the Pluronic chains on the surface, thus enhancing the miscibility within the fibers. Water uptake test revealed the super hydrophilicity of obtained scaffolds. Atr‐FTIR and X‐ray photoelectron spectroscopy verified a higher percentage of Pluronics on the surface in comparison with conventional blend electrospinning. Tensile test demonstrated improved mechanical properties of the modified scaffolds. The results of cytocompatibility tests have also revealed enhanced viability of cells on these scaffolds confirming their great promise for clinical applications. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 1204–1212, 2019.

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Protein Amyloid Fibrils as Template for the Synthesis of Silica Nanofibers, and Their Use to Prepare Superhydrophobic, Lotus‐Like Surfaces

Rima

Lattuada

2018

Small

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In this work, amyloid fibrils are used as a template for the preparation of long silica fibers, with a variety of aspect ratios and surface roughness. Starting with β‐lactoglobulin fibrils with typical diameters of about 20 nm and a length of several micrometers, two different strategies are followed to grow silica: either in water at acidic pH values, or in ethanol–water mixtures under Stöber conditions and an excellent control of both the thickness and the roughness of the silica layer has been achieved. Silica nanofibers with a thickness ranging from a few nanometers to hundreds of nanometers are prepared. As an application, the rough silica nanotubes are used to create superhydrophobic surfaces by mimicking the structure of the lotus leaf. The papillary structure of the lotus leaf is replicated by depositing 10 μm colloidal particles in either a single colloidal crystal, or in a binary colloidal crystal made with smaller sub‐micrometer particles. Then, silica nanofibers are deposited on the binary colloidal crystal surfaces through a layer‐by‐layer deposition procedure to replicate the nanoscale roughness provided by wax nanotubes. Upon hydrophobization of the silica nanotubes, the final surfaces are highly superhydrophobic, with a water contact angle of 165.5°.

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Synthesis of Silica Nanotube Using Myelin Figure as Template and their Formation Mechanism

Cited by 12 publications

References 33 publications

Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic polycaprolactone based fibers: Analysis of drug release behavior

Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic polycaprolactone based fibers: Analysis of drug release behavior

Surfactant‐assisted‐water‐exposed versus surfactant‐aqueous‐solution‐exposed electrospinning of novel super hydrophilic Polycaprolactone‐based fibers: Cell culture studies

Protein Amyloid Fibrils as Template for the Synthesis of Silica Nanofibers, and Their Use to Prepare Superhydrophobic, Lotus‐Like Surfaces

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