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Nanofibers nanospheres

Figures 12.1.14-12.1.16 show a variety of shapes which have been observed. These include nanospheres, assemblies of cylindrical aggregates, and nanofibers." Nanospheres were obtained by the gradual removal of solvent by dialysis, fibers were produced by a series of processes involving dissolution, crosslinking, and annealing. Figure 12.1.17 sheds some light on the mechanism of aggregate formation. Two elements are clearly visible from micrographs knots and strands. Based on studies of carbohydrate amphiphiles, it is concluded that knots are formed early in the process by spinodal decomposition. Formation of... Figures 12.1.14-12.1.16 show a variety of shapes which have been observed. These include nanospheres, assemblies of cylindrical aggregates, and nanofibers." Nanospheres were obtained by the gradual removal of solvent by dialysis, fibers were produced by a series of processes involving dissolution, crosslinking, and annealing. Figure 12.1.17 sheds some light on the mechanism of aggregate formation. Two elements are clearly visible from micrographs knots and strands. Based on studies of carbohydrate amphiphiles, it is concluded that knots are formed early in the process by spinodal decomposition. Formation of...
Keywords Block copolymer Cell-mediated delivery Liposome Mulddrug resistance Nanofiber Nanogel Nanoparticle Nanosphere Nanosuspension Nanotube... [Pg.691]

Figure 47.1. Types of naiiocaniers for dmg delivery. A liposomes B nanopaiticles C nanospheres D nanosuspensions E polymer micelles F- nanogel G block ionomer complexes H nanofibers and nanot ... Figure 47.1. Types of naiiocaniers for dmg delivery. A liposomes B nanopaiticles C nanospheres D nanosuspensions E polymer micelles F- nanogel G block ionomer complexes H nanofibers and nanot ...
Figure 4.12 Schematic illustration of the mechanism for preparing core-shell nanostructured conductive PPy composites. (Reprinted with permission from Materials Letters, Fabrication of Polyacrylonitrile/polypyrrole (PAN/Ppy) composite nanofibers and nanospheres with core shell structures by electrospinning by X. Li, X. Hao, H. Yu and H. Na, 62, 1155-1158. Figure 4.12 Schematic illustration of the mechanism for preparing core-shell nanostructured conductive PPy composites. (Reprinted with permission from Materials Letters, Fabrication of Polyacrylonitrile/polypyrrole (PAN/Ppy) composite nanofibers and nanospheres with core shell structures by electrospinning by X. Li, X. Hao, H. Yu and H. Na, 62, 1155-1158.
The cellulose based materials that are used as nano-reinforcements are cellulose nanocrystals (i.e. whiskers and nanospheres), nanofibrillated cellulose, regenerated cellulose nanoparticles and electrospun nanofibers. A wide range of polymer matrices have been used to form cellulose nanocomposites. Synthetic polymers such as polypropylene, poly(vinyl chloride) (PVC) [102], waterborne epoxy [103], waterborne polyurethane [104], polyurethane [105], poly-(styrene-co-butyl acrylate) [106], poly(oxyethylene) [107], polysiloxanes [108], polysulfonates [109], cellulose acetate butyrate [110,111], poly(caprolactone) [112], poly(viny 1 alcohol) [113] and poly (vinyl acetate) [114]. Different biopolymers such as starch-based... [Pg.34]

Figure 2.11 SEM image of carbon nanospheres (left-above] and after (left-below] calcination of nanofibers prepared with carbon nanospheres, and XRD patterns of TiOj nanofibers (right] (a] and porous TiOj nanofibers (b]. Reprinted from Ref. 62, Copyright 2012 Shanhu Liu et al. Figure 2.11 SEM image of carbon nanospheres (left-above] and after (left-below] calcination of nanofibers prepared with carbon nanospheres, and XRD patterns of TiOj nanofibers (right] (a] and porous TiOj nanofibers (b]. Reprinted from Ref. 62, Copyright 2012 Shanhu Liu et al.
Figure 73 Representative 3-D nanostructured scaffolds for bone-specific drug delivery systems, (a) Electrospun sitk scaffold with BMP-2 loaded, scale bar=5 pm (reprinted from Ref. [86] with permission) (b) Self-assembled peptide-amphiphile (PA) nanofibers network, scale bar= 1 mi (reprinted from Ref. [87] with permission) (c) Nanocrystalline apatite modified poly(lactide-co-glycolide) (PLAGA) microsphere scaffolds, scale bar=2pm (reprinted from Ref. [88] with permission) and (d) poly(L-lactic acid) (PLLA) nanofibrous scaffolds incorporated with poly(lactic-co-glycolic acid) (PLGA) nanospheres, scale bar=2 pm (reprinted from Ref. [89] with permission). Figure 73 Representative 3-D nanostructured scaffolds for bone-specific drug delivery systems, (a) Electrospun sitk scaffold with BMP-2 loaded, scale bar=5 pm (reprinted from Ref. [86] with permission) (b) Self-assembled peptide-amphiphile (PA) nanofibers network, scale bar= 1 mi (reprinted from Ref. [87] with permission) (c) Nanocrystalline apatite modified poly(lactide-co-glycolide) (PLAGA) microsphere scaffolds, scale bar=2pm (reprinted from Ref. [88] with permission) and (d) poly(L-lactic acid) (PLLA) nanofibrous scaffolds incorporated with poly(lactic-co-glycolic acid) (PLGA) nanospheres, scale bar=2 pm (reprinted from Ref. [89] with permission).
In terms of the nanomaterial morphology, specific fabrication methods for five typical conducting polymers (PPy, PANI, PT, PEDOT, PPV) have been reviewed in Sects. 4-8. It deals with nanoparticle, core-shell nanomaterials, hollow nanospheres, nanofibers, nanotubes, nanopatterns, and nanocomposites of each conducting polymer. [Pg.194]

Scanning electron microscopy (SEM) is one of the very useful microscopic methods for the morphological and structural analysis of materials. Larena et al. classified nanopolymers into three groups (1) self-assembled nanostructures (lamellar, lamellar-within-spherical, lamellar-within-cylinder, lamellar-within-lamellar, cylinder within-lamellar, spherical-within-lamellar, and colloidal particles with block copolymers), (2) non-self-assembled nanostructures (dendrimers, hyperbranched polymers, polymer brushes, nanofibers, nanotubes, nanoparticles, nanospheres, nanocapsules, porous materials, and nano-objects), and (3) number of nanoscale dimensions [uD 1 nD (thin films), 2 nD (nanofibers, nanotubes, nanostructures on polymeric surfaces), and 3 nD (nanospheres, nanocapsules, dendrimers, hyperbranched polymers, self-assembled structures, porous materials, nano-objects)] [153]. Most of the polymer blends are immiscible, thermodynamically incompatible, and exhibit multiphase structures depending on the composition and viscosity ratio. They have two types of phase morphology sea-island structure (one phase are dispersed in the matrix in the form of isolated droplets, rods, or platelets) and co-continuous structure (usually formed in dual blends). [Pg.25]

The diarylethene (95) with a histamine substituent exhibited the morphology of self-assembled supramolecular architecture which could be tuned from nanofiber to nanosphere upon UV/Vis irradiation. The quadruply hydrogen-bonding ureido-pyrimidinone (96) unit organized by dithienylethene afforded linear assemblies in solutions and underwent... [Pg.85]

Park KH, Lee S, Koh KH, Lacerda R, Teo KBK, Milne WI (2005) Advanced nanosphere lithography for the areal-density variation of periodic arrays of vertically aligned carbon nanofibers. J Appl Phys 97 024311-1... [Pg.98]

Albumin is a water-soluble protein and a major component of human blood plasma. It can be easily processed into various forms like membranes, microspheres, nanofibers, and nanospheres [22]. Studies have shown that almost all tissues in the human body have the ability to degrade albumin [23]. For this reason, albumin is usually cross-linked so as to slow its rate of resorption or lysis. Albumin has been studied extensively for applications like surgical adhesives, coating materials for cardiovascular devices, and drug delivery vehicles [24, 25]. [Pg.54]

Albumin is a water-soluble protein representing 50% of total plasma mass and is the most copious protein in human blood plasma. The pre-proalbumins synthesized in the liver are further processed and released into the circulatory system. Albumin is known to degrade in all tissues in the body and shows excellent blood compatibility, making it a great choice of biodegradable polymer for medical applications [40]. Albumin can be effortlessly modified, due to the presence of functional groups and desirable solubility, into various shapes and forms such as membranes, microspheres, nanofibers and nanospheres. [Pg.259]


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See also in sourсe #XX -- [ Pg.690 ]

See also in sourсe #XX -- [ Pg.690 ]

See also in sourсe #XX -- [ Pg.690 ]




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Nanosphere

Nanospheres

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