Cellulose Acetate Electrospun Fiber Mats for Controlled Release of Silymarin

2012 ◽  
Vol 12 (1) ◽  
pp. 793-799 ◽  
Author(s):  
Manisara Phiriyawirut ◽  
Thawatchai Phaechamud
Keyword(s):  
Controlled Release ◽  
Cellulose Acetate ◽  
Electrospun Fiber ◽  
Fiber Mats

Controlled release of curcumin from electrospun fiber mats with antibacterial activity

2020 ◽  
Vol 55 ◽  
pp. 101386 ◽  
Author(s):  
Md Musavvir Mahmud ◽  
Sumaiya Zaman ◽  
Asma Perveen ◽  
Rumana A. Jahan ◽  
Md Fakhrul Islam ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Controlled Release ◽  
Electrospun Fiber ◽  
Fiber Mats

Preparation of Thai silk fibroin/gelatin electrospun fiber mats for controlled release applications

2010 ◽  
Vol 46 (5) ◽  
pp. 544-550 ◽  
Author(s):  
Manunya Okhawilai ◽  
Ratthapol Rangkupan ◽  
Sorada Kanokpanont ◽  
Siriporn Damrongsakkul
Keyword(s):  
Controlled Release ◽  
Silk Fibroin ◽  
Electrospun Fiber ◽  
Fiber Mats

Factors Influencing the Morphology of Cellulose Acetate Electrospun Fiber Mats

2012 ◽  
Vol 506 ◽  
pp. 242-245 ◽  
Author(s):  
S. Plianwong ◽  
K. Su-Utha ◽  
Praneet Opanasopit ◽  
Tanasait Ngawhirunpat ◽  
Theerasak Rojanarata
Keyword(s):  
Cellulose Acetate ◽  
Electrospun Fiber ◽  
Constant Electric Field ◽  
Electrospinning Process ◽  
Fiber Mats ◽  
Effect Of Solvent ◽  
Factors Influencing ◽  
Microscope Imaging ◽  
Electron Microscope Imaging ◽  
Selection Of

This study investigated the effect of solvent composition, spinning rate and spinning time on the morphology of electrospun cellulose acetate (CA) fiber mats. To fabricate the fibers, 17 %w/v CA solutions prepared in the solvent consisting of acetone/N,N-dimethylacetamide (DMAc) at the ratios of 2:1, 1:1 and 1:2 (v/v) were subjected to electrospinning process under the constant electric field of 1.17 kV/cm. Scanning electron microscope imaging revealed that different morphologies of fibers obtained were bead-free fibers, fibers with spherical beads, and fibers with spindles, when the acetone/DMAc ratios of 2:1, 1:1 and 1:2 were used, respectively. In the aspect of spinning rate, it was found that the diameter of electrospun CA fibers, spindles or beads increased with the increasing spinning rate from 0.2 to 1 ml h-1. In addition, the thickness of electrospun CA fiber mats was directly proportional to the spinning time from 2 to 6 h and spinning rate. Interestingly, by using the same spinning time and rate, the bead-free fiber mats were thicker than mats containing fiber with spherical beads or with spindles. These findings provide useful information for the selection of suitable electrospinning parameters in order to obtain the fiber mat with desired characteristics for the intended purpose.

Production and Characterization of Nanoporous Polymer Membranes Produced by an Electrospraying Process

2000 ◽  
Author(s):  
Phillip Gibson ◽  
Heidi Schreuder-Gibson
Keyword(s):  
Transport Properties ◽  
Membrane Structure ◽  
Protective Clothing ◽  
Theoretical Calculations ◽  
Electrospun Fiber ◽  
Air Flow ◽  
Filtration Efficiency ◽  
Thin Layers ◽  
Direct Result ◽  
Fiber Mats

Abstract Electrospinning is a process by which high voltages are used to produce an interconnected membrane-like web of small fibers (10 to 500 nanometers in diameter). This novel fiber spinning technique provides the capacity to lace together a variety of types of polymers, fibers, and particles to produce ultrathin layers which are useful for chemical protective clothing. Of particular interest are electrospun membranes composed of elastomeric fibers, which are under development for several protective clothing applications. The various factors influencing electrospun nonwoven fibrous membrane structure and transport properties are discussed. Performance measurements on experimental electrospun fiber mats compared favorably with transport properties of textiles and membranes currently used in protective clothing systems. It was found that electrospun layers presented minimal impedance to moisture vapor diffusion required for evaporative cooling. There may be special considerations in the application of elastomeric membranes for protective clothing. Effects of membrane distortion upon transport behavior of the structure might be significant. Preliminary measurements have found that changes in elastomeric membrane structure under different states of biaxial strain were reflected in measurements of air flow through the membrane. Changes in membrane structure were also evident in environmental scanning electron microscope images of the pore/fiber rearrangement as the membrane was stretched. Experimental measurements and theoretical calculations show electrospun fiber mats to be extremely efficient at trapping airborne particles. The high filtration efficiency is a direct result of the submicron-size fibers generated by the electrospinning process. Electrospun nanofiber coatings were applied directly to an open cell polyurethane foam. The air flow resistance and aerosol filtration properties correlated with the electrospun coating add-on weight. Particle penetration through the foam layer, which is normally very high, was eliminated by extremely thin layers of electrospun nanofibers sprayed on to the surface of the foam. Electrospun fiber coatings produce an exceptionally lightweight multifunctional membrane for protective clothing applications which exhibits high breathability, elasticity, and filtration efficiency.

Optimization of Chitosan/PVA Concentration in Fabricating Nanofibers Membrane and its Prospect as Air Filtration

2017 ◽  
Vol 901 ◽  
pp. 20-25 ◽  
Author(s):  
Himayatus Shalihah ◽  
Ahmad Kusumaatmaja ◽  
Ari Dwi Nugraheni ◽  
Kuwat Triyana
Keyword(s):  
Electrospun Fiber ◽  
Chemical Compounds ◽  
Average Diameter ◽  
Air Filtration ◽  
Maximum Condition ◽  
Chemical Absorption ◽  
Fiber Mats ◽  
Before And After ◽  
Porosity Percentage ◽  
Scanning Electron

Chitosan/polyvinyl-alcohol (Chitosan/PVA) based nanofibers were successfully produced using electrospinning machine and investigated their application as air filtration. Firstly, 2 wt% chitosan was dissolved to 1 wt% acetic acid followed by mixing with PVA solution to produce fiber mats or membrane. Secondly, the morphology and diameter of the electrospun fiber were analyzed by using a scanning electron microscopy (SEM), while the chemical compounds in the membrane were characterized using Fourier transform infrared spectroscopy (FTIR). It was found that the conductivity of solution increased by the concentration of chitosan. Meanwhile, the average diameter and percentage of porosity decreased due to the upsurge of the conductivity of the solution. The average diameter of PVA 13 wt% was and the percentage of porosity were 50.32%. The maximum condition of chitosan/PVA was obtained at 20/80 wt%, in line with the average of fiber diameters and the percentage of porosity were 25.32%. Physicochemical properties of chitosan/PVA solution, such as conductivity, morphology, and chemical absorption were investigated before and after the air filtration. The porosity percentage of PVA 13wt% after air filtration changed to 35.85% and the percentage of porosity of chitosan/PVA 20/80 became 25.32%. Remarkable absorption peaks of PVA 13wt% exhibited and - shifted after the air filtration test, it was indicating that functional groups had been reduced. The chemical absorption of chitosan/PVA 20/80 wt% showed at the the region then disappeared after the air filtration test.

scholarly journals Controlled release of drugs from cellulose acetate matrices produced from sugarcane bagasse: monitoring by square-wave voltammetry

2015 ◽  
Vol 42 (7) ◽  
pp. 1066-1072 ◽  
Author(s):  
Guimes Rodrigues Filho ◽  
Flávia Almeida ◽  
Sabrina D. Ribeiro ◽  
Thiago F. Tormin ◽  
Rodrigo A. A. Muñoz ◽  
...  
Keyword(s):  
Controlled Release ◽  
Cellulose Acetate ◽  
Sugarcane Bagasse ◽  
Square Wave Voltammetry ◽  
Square Wave ◽  
Wave Voltammetry
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