Electrospun Gelatin Fiber Bundles by Self-Bundling Electrospinning

2015 ◽  
Vol 1105 ◽  
pp. 190-194 ◽  
Author(s):  
Patcharaporn Thitiwongsawet ◽  
Boonchuay Wisesanupong ◽  
Supatcharee Pukkanasut
Keyword(s):  
Electrical Conductivity ◽  
Acetic Acid ◽  
Solvent Mixture ◽  
Electrospinning Process ◽  
Single Fiber ◽  
Fiber Bundles ◽  
Electrospun Gelatin

Electrospun gelatin fiber bundles were successfully prepared by self-bundling electrospinning process. A solvent mixture of 80:20 v/v acetic acid: N,N-dimethylacetamide was used as solvent for gelatin. Self-bundling was achieved by using of a grounded needle tip at the beginning of electrospinning process. Gelatin fiber bundles were fabricated from 30% w/v gelatin solutions with addition of pyridinium formate (PF) at concentrations of 3 and 5% w/v. The averaged diameters of single fiber were 452 and 410 nm, respectively; whereas, the averaged diameter of bundles were 17.2 and 22.3 μm, respectively. Viscosity and electrical conductivity of solutions were important parameters for achieving self-bundling electrospinning. Gelatin solutions with optimum electrical conductivity and viscosity could yield bundles by self-bundling electrospinning.

Polycaprolactone Fiber Bundles Prepared by Self-Bundling Electrospinning

2012 ◽  
Vol 622-623 ◽  
pp. 271-275 ◽  
Author(s):  
Patcharaporn Thitiwongsawet ◽  
Tanwa Tiyajalearn ◽  
Aumnart Klinchan ◽  
Chaninporn Thanatthammachote
Keyword(s):  
Electrical Conductivity ◽  
Fiber Diameter ◽  
Average Diameter ◽  
Electrospinning Process ◽  
Fiber Bundles ◽  
Electrospun Fibers ◽  
Average Fiber Diameter ◽  
Electrospinning Technique

Polycaprolactone (PCL) fiber bundles were successfully prepared by self-bundling electrospinning technique from two different concentrations (i.e. 12% and 15% w/v) of PCL solution. Self-bundling of electrospun fibers was induced by used of a grounded needle tip at the beginning of electrospinning process. Electrical conductivity of PCL solutions were increased and average fiber diameter were decreased by addition and increasing amount of pyridinium formate (PF) at concentration of 3, 4, and 5% w/v into either 12% or 15% w/v PCL solutions. The average diameter of electrospun fibers and bundles were in range of 2.1-3.3 m and 100-120 m, respectively.

scholarly journals SYNTHESIS AND CONFORMATION OF p-(AMINO)BUTOXYCALIX[4]ARENE

2010 ◽  
Vol 7 (1) ◽  
pp. 49-57
Author(s):  
Firdaus Firdaus ◽  
Jumina Jumina ◽  
Hardjono Sastrohamidjojo
Keyword(s):  
Acetic Acid ◽  
Solvent Mixture ◽  
Reduction Reaction ◽  
Nitrogen Atmosphere ◽  
Reduction Reactions ◽  
Partial Cone ◽  
Acetic Acid Glacial

Derivatization of 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrahydroxycalix[4]-arene to 5,11,17,23-tetra-amino-25,26,27,28-tetrabutoxycalix[4]arene compound via etherification, ipso nitration, and reduction reactions, respectively has been conducted. The etherification reaction was carried out by refluxed the mixture of 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrahydroxy-calix[4]arene, 1-bromobutane, NaI, and NaH in solvent mixture of THF-DMF (10:1 v/v) and nitrogen atmosphere for 4 hours to resulted 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrabutoxycalix[4]-arene 84% in yield; ipso nitration reaction was carried out by stirred the mixture of 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrabutoxycalix[4]arene and HNO3 100% in solvent mixture of dichloromethane-acetic acid glacial (1:1 v/v) for 2 hours and than refluxed for 1 hour to resulted 5,11,17,23-tetra-nitro-25,26,27,28-tetra-butoxycalix[4]arene 50% in yield; and reduction reaction was carried out by refluxed the mixture of 5,11,17,23-tetra-nitro-25,26,27,28-tetrabutoxycalix[4]arene and SnCl2/HCl reductor in ethanol solvent for 6 hours to resulted 5,11,17,23-tetra-amino-25,26,27,28-tetrabutoxycalix[4]arene 67% in yield. In the etherification reaction, the conformation of calix[4]arene compound was converted from cone to partial cone; but in the followed reactions, i.e. nitration and reduction reactions, the conformation of calix[4]arene compounds were remain in partial cone.   Keywords: aminobutoxycalixarene, conformation, etherification, ipso nitration, reduction

scholarly journals Comparison and Impact of Different Fiber Debond Techniques on Fiber Reinforced Flexible Composites

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 472 ◽  
Author(s):  
Julia Beter ◽  
Bernd Schrittesser ◽  
Boris Maroh ◽  
Essi Sarlin ◽  
Peter Filipp Fuchs ◽  
...  
Keyword(s):  
Single Fiber ◽  
Fiber Bundles ◽  
Testing Device ◽  
Adhesion Properties ◽  
Test Setup ◽  
Flexible Composites ◽  
Pull Out ◽  
Specimen Holder ◽  
Microbond Test ◽  
Modified Test

The focus of this paper is the realization and verification of a modified fiber bundle pull-out test setup to estimate the adhesion properties between threads and elastic matrix materials with a more realistic failure mode than single fiber debond techniques. This testing device including a modified specimen holder provides the basis for an adequate estimation of the interlaminar adhesion of fiber bundles including the opportunity of a faster, easier, and more economic handling compared to single fiber tests. The verification was done with the single-fiber and microbond test. Overall, the modified test setup showed the typical pull-out behavior, and the relative comparability between different test scales is given.

Determination of the Iodine Value of Oils and Fats: Summary of Collaborative Study

1994 ◽  
Vol 77 (3) ◽  
pp. 674-676 ◽  
Author(s):  
David Firestone
Keyword(s):  
Acetic Acid ◽  
Iodine Value ◽  
Collaborative Study ◽  
Solvent Mixture ◽  
Acid Mixture ◽  
Collaborative Studies ◽  
Wide Range ◽  
Aoac Method ◽  
Iodine Values

Abstract Two collaborative studies were conducted using the Wijs method for determining the iodine value in a wide range of vegetable and animal oils and fats. The results obtained when using carbon tetrachlo-ride were compared to those obtained when using a substitute solvent mixture of cyclohexane and glacial acetic acid. The values reported for the iodine values indicate that the cyclohexane and acetic acid mixture can be used in place of carbon tetrachloride without loss of precision. The method has been adopted first action by AOAC INTERNATIONAL as an IUPAC/AOCS/AOAC method.

Formation the Polypyrrole / Chitosan / Polylactic Acid Microencapsules

2014 ◽  
Vol 881-883 ◽  
pp. 83-86 ◽  
Author(s):  
Hong Ye ◽  
Ying Liu ◽  
Xiang Hong Peng ◽  
Kun Wan ◽  
Feng Chen
Keyword(s):  
Electrical Conductivity ◽  
Acetic Acid ◽  
Lactic Acid ◽  
Polylactic Acid ◽  
Smooth Surface ◽  
Poly Lactic Acid ◽  
Spray Dried

The emulsion of chitosan in acetic acid aqueous and poly lactic acid in chloroform was spray-dried to obtain the chitosan/poly lactic acid microencapsules (CS-PLA). The polypyrrole / chitosan/ polylactic acid microencapsules were prepared by polymerization pyrrole on CS-PLA. The structures and the morphologies of microencapsules were characterized by FTIR, SEM, TGA and four probes technique. The results showed that multilayer polypyrrole were formation on the surface of CS-PLA microencapsules, the microencapsules had 3.0-8.0 μm diameters with smooth surface, and the electrical conductivity value was 1.03×10-3 S/cm.

Sodium-ion storage performance of hierarchically structured (Co1/3Fe2/3)Se2nanofibers with fiber-in-tube nanostructures

2016 ◽  
Vol 4 (40) ◽  
pp. 15471-15477 ◽  
Author(s):  
Young Jun Hong ◽  
Jung Hyun Kim ◽  
Yun Chan Kang
Keyword(s):  
Electrical Conductivity ◽  
Hierarchical Structures ◽  
Electrospinning Process ◽  
Sodium Ion ◽  
Rate Performance ◽  
High Electrical Conductivity ◽  
Storage Performance ◽  
Synergetic Effects ◽  
Ion Storage ◽  
Sodium Ion Storage

Hierarchically structured (Co1/3Fe2/3)Se2nanofibers with fiber-in-tube nanostructures were prepared by an electrospinning process and subsequent selenization. The synergetic effects of the hierarchical structures and ultrafine nanorods with high electrical conductivity resulted in superior rate performance of the hierarchically structured (Co1/3Fe2/3)Se2nanofibers.

Bathochromic shift of the Q-bands of octakis(p-t-butylbenzyloxy)phthalocyanines with magnesium(II), nickel(II) and copper(II) in a solvent mixture of chloroform and acetic acid

2005 ◽  
Vol 09 (09) ◽  
pp. 646-650 ◽  
Author(s):  
Kuninobu Kasuga ◽  
Katsuyori Yashiki ◽  
Tamotsu Sugimori ◽  
Makoto Handa
Keyword(s):  
Acetic Acid ◽  
Trifluoroacetic Acid ◽  
Bathochromic Shift ◽  
Solvent Mixture ◽  
Red Shift ◽  
Weak Band ◽  
Propanol Solution ◽  
Phthalocyanine Ring

1,4,8,11,15,18,22,25-octakis(p-t-butylbenzyloxy)phthalocyanine complexes of magnesium(II), nickel(II) and copper(II) were prepared by refluxing the propanol solution of 3,6-di(p-t-butylbenzyloxy)phthalonitrile in the presence of magnesium turnings. The complexes showed intense Q-bands between 740 and 750 nm in chloroform. The magnesium(II) complex showed an additional weak band at 807 nm in chloroform, while the nickel(II) and copper(II) did not. The Q-band of the magnesium(II) species was red-shifted with increase of acetic acid in the solvent mixture of chloroform and acetic acid; 745, (765, 807) and (810, 868 nm) in chloroform, 0.1% (v/v) acetic acid and 60% (v/v) acetic acid, respectively. The magnesium(II) complex has bands at 900 and 999 nm in trifluoroacetic acid. In the solvent mixture of 1% (v/v) acetic acid, the red-shift of the Q-band was larger for the magnesium(II) derivative, a little for the nickel(II) and scarcely for the copper(II), respectively. The shift was explained by protonation of the external nitrogen atoms of the phthalocyanine ring.

Preparation and characterization of polyvinyl alcohol/carbon nanotube (PVA/CNT) conductive nanofibers

2012 ◽  
Vol 32 (6-7) ◽  
pp. 407-413 ◽  
Author(s):  
Ozcan Koysuren
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Polyvinyl Alcohol ◽  
Specific Capacitance ◽  
Electrode Surface ◽  
Electrospinning Process ◽  
Morphology Analysis ◽  
Highly Porous

Abstract The aim of this study was to prepare polyvinyl alcohol/carbon nanotube (PVA/CNT) conductive nanofibers by the electrospinning process. Prior to composite preparation, carbon nanotubes are dispersed homogeneously in N-methyl-2-pyrrolidone (NMP) and mixed with a PVA solution. A series of PVA/CNT films and nanofibers with various CNT compositions are prepared. Electrical conductivity and specific capacitance of spin-coated PVA/CNT films and electrospun PVA/CNT fibers increase with an increase in CNT content. Electrospun PVA/CNT nanofibers with a larger electrode surface result in a higher specific capacitance when compared with spin-coated PVA/CNT films. According to the morphology analysis, homogeneous and highly porous PVA/CNT mats containing 50–300 nm diameter nanofibers are obtained by the electrospinning process.

Sign in / Sign up

Export Citation Format

Share Document