Fibrous membranes of cellulose acetate and poly(vinyl pyrrolidone) by electrospinning method: Preparation and characterization

2010 ◽  
pp. NA-NA
Author(s):  
M. M. Castillo-Ortega ◽  
J. Romero-García ◽  
F. Rodríguez ◽  
A. Nájera-Luna ◽  
P. J. Herrera-Franco
Keyword(s):  
Cellulose Acetate ◽  
Vinyl Pyrrolidone ◽  
Electrospinning Method ◽  
Fibrous Membranes ◽  
Poly Vinyl Pyrrolidone

Preparation, characterization and release of amoxicillin from cellulose acetate and poly(vinyl pyrrolidone) coaxial electrospun fibrous membranes

2011 ◽  
Vol 31 (8) ◽  
pp. 1772-1778 ◽  
Author(s):  
M.M. Castillo-Ortega ◽  
A. Nájera-Luna ◽  
D.E. Rodríguez-Félix ◽  
J.C. Encinas ◽  
F. Rodríguez-Félix ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Vinyl Pyrrolidone ◽  
Fibrous Membranes ◽  
Poly Vinyl Pyrrolidone

Ultrafine Cellulose Acetate Fibers with Nanoscale Structural Features

2008 ◽  
Vol 8 (9) ◽  
pp. 4461-4469 ◽  
Author(s):  
Lifeng Zhang ◽  
You-Lo Hsieh
Keyword(s):  
Hydrogen Bonding ◽  
Cellulose Acetate ◽  
Pore Volume ◽  
Structural Features ◽  
Fiber Formation ◽  
Vinyl Pyrrolidone ◽  
Chain Entanglement ◽  
Bicomponent Fibers ◽  
Micron Size ◽  
Poly Vinyl Pyrrolidone

Nano-structural features were introduced to ultrafine cellulose acetate (CA) fibers by electrospinning of its mixtures with either poly(vinyl pyrrolidone) PVP or β-cyclodextrin (β-CD) in DMF, followed by dissolution of the added PVP or β-CD. The presence of the charge-holding PVP enabled fiber formation from CA below its entanglement chain length and improved the electrospinning efficiency to produce bicomponent fibers with wide ranging diameters from 30 to 650 nm. At up to 50% contents, the PVP in the bicomponent fibers was phase-separated from CA and, upon removal, resulting in highly angulated fiber surfaces with nanometer-size spherulites and sub-micron size ridges and grooves. Adding β-CD to CA enabled fiber formation at concentrations below the chain entanglement concentration Ce (16.5%). Hydrogen bonding between β-CD and CA, as evident by FTIR, helped to distribute β-CD as individual molecules in the CA matrix and producing more uniform and finer (130–150 nm in diameters) fibers, irrespective of their β-CD contents. Removal of β-CD from the fibers originally containing 40% β-CD, generated nanoporous fibers with 2-nm nanopores and 70% increase in specific surface and doubled pore volume.

Preparation of PCL/PVP/Ag Nanofiber Membranes by Electrospinning Method

2012 ◽  
Vol 268-270 ◽  
pp. 580-583 ◽  
Author(s):  
Yong Tang Jia ◽  
Cui Wu ◽  
Feng Chun Dong ◽  
Gang Huang ◽  
Xian Hua Zeng
Keyword(s):  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Composite Nanofibers ◽  
Average Diameter ◽  
Vinyl Pyrrolidone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrospinning Method ◽  
Nanofiber Membranes ◽  
Poly Vinyl Pyrrolidone

The composite nanofiber membranes of poly (ε-caprolactone)/poly(vinyl pyrrolidone) (PCL/PVP) containing silver nanoparticles were prepared by electrospinning method. The morphology of composite nanofibers was characterized by scanning electron microscopy (SEM). The silver nanoparticles on the electrospun fibers were characterized by X-Ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The contact angle and water uptake of PCL/PVP/Ag nanofiber membranes were measured. The SEM photos indicated that the average diameter of the fibers was significantly decreased with the addition of silver nanoparticles. The X-Ray images showed that Ag nanoparticles were distributed on the surface of nanofiber membranes. When the PVP mole ratio was higher than 15%, the nanofiber membranes showed good hydrophilic property. The PCL/PVP/Ag nanofiber membranes could be applied to prepare wound dressing.

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