Fibers coaxial

Reservoir or coaxial fibers can be produced from the glycolide/ lactide polymers (53,55). Two different methods have been investigated. Dunn (53) utilized a melt-spinning technique in which the drug was introduced during the spinning process as a suspension or solution in a suitable lumen fluid. Eenink (55) developed a dry-... 

The concept of these systems comprises a coaxial fiber. In this fiber, a drug is dispersed or dissolved in a core polymer. The release of the drug from these coaxial fibers is proportional to the concentration gradient in the fiber. If the drug is present in a concentration that exceeds solubility in the membrane, on the adjacent surface the saturated concentration is established. This stationary concentration is responsible for the gradient. 

Cabling—Twisted-Pair, Coaxial, Fiber Optic, RS-232 Ways to network a PC Physical Network topographies Increasing bandwidth Loss of data Network slowdown Infrared... 

Characteristics Twisted-Pair Coaxial Fiber-Optic Wireless... 

Dong and Jones Jr. reported on the preparation of submicron electrically conductive polypyrrole/poly(methyl methacrylate) coaxial fibers and conversion to polypyrrole tubes and carbon tubes [47]. In this study, PMMA fibers with an average diameter of 230 nm were initially fabricated by electrospinning as core materials. The PMMA fibers were subsequently coated as templates with a thin layer of PPy by in situ deposition of the conducting polymer from aqueous solution. Hollow PPy nanotubes were produced by dissolution of the PMMA core from PPy/PMMA coaxial fibers. Furthermore, high temperature (1000 °C) treatment under an inert atmosphere can be used to convert PPy/PMMA coaxial fibers into carbon tubes by complete decomposition of the PMMA fiber core and carbonization of the PPy wall (Figure 4.13). 

Figure 4.13 Preparation of submicron polypyrrole/polyfmethyl methacrylate) coaxial fibers and conversion to polypyrrole tubes and carbon tubes. (Reprinted with permission from Langmuir, Preparation of Submicron Polypyrrole/Polyfmethyl methacrylate) coaxial fibers and conversion to polypyrrole tubes and carbon tubes by H. Dong and W. E. Jones Jr., 22, /1384-11387. Copyright (2006) American Chemical Society)...

H. Dong, V. Nyame, A. G. MacDiarmid, and W. E. Jones Jr., Polyaniline/poly(methyl methacrylate) coaxial fibers the fabrication and effects of the solution properties on the morphology of electrospun core fibers, J. Polymer Sci. B Polymer Phys., 42, 3934—3942... 

Weng, W., Sun, Q., Zhang, Y., Lin, H.L, Ren, L, Lu, X.,Wang, M., Peng, H.S., 2014. Wmduig aligned carbon nanotube composite yarns into coaxial fiber full batteries with high performances. Nano Lett. 14, 3432-3438. 

The dependence of magnetic properties on fiber alignment was reported by Sharma et al. [185]. They prepared coaxial fibers of PEO incorporating Fe203 NPs that exhibited perpendicular magnetic anisotropy when collected as parallel fibers. 

Rubert, M., et al., 2014. Electrospun PCL/PEO coaxial fibers for basic fibroblast growth factor delivery. Journal of Materials Chemistry B 2 (48), 8538—8546. 

Weng W, et al. Winding aligned carbon nanotube composite yams into coaxial fiber fiiU batteries with high performances. Nano Lett 2014 14(6) 3432—8. 

Chen XL, et al. Novel electric double-layer capacitor with a coaxial fiber stmcture. Adv Mater 2013 25(44) 6436-41. 

Saraf A, et al. Fabrication of nonwoven coaxial fiber meshes by electrospinning. Tissue Eng Part C-Me 2009 15 333-44. 

Most extruders are equipped with a single screw, but two-screw or more extruders are available. These are able to produce coaxial fibers or tubes and multi-component sheets. 

Gu Y, Jian F (2008) Hollow LiNio,8Coo,iMno,i02-MgO coaxial fibers sol-gel method combined with co-electrospun preparation and electrochemical properties. J Phys Chem C 112(51) 20176-20180. doi 10.1021/jp808468x... 

Gu Y, Chen D, Jiao X, Liu F (2007) LiCo02-MgO coaxial fibers co-electrospun fabrication, characterization and electrochemical properties. J Mater Chem 17(18) 1769-1776. doi 10.1039/b614205b... 

---