Scanning electron microscopy cotton

The morphology of silver nanopartilces on the cotton surface and paint samples was observed by field emission scanning electron microscopy (FE-SEM JSM-6700F, JEOL, Japan). The size and shape of the nanoparticles in solution were determined with transmission electron microscopy (TEM) (LEO-912-OMEGA, Carl Zeiss, Germany). 

Graft and block copolymers of cotton cellulose, in fiber, yam, and fabric forms, were prepared by free-radical initiated copolymerization reactions of vinyl monomers with cellulose. The properties of the fibrous cellulose-polyvinyl copolymers were evaluated by solubility, ESR, and infrared spectroscopy, light, electron, and scanning electron microscopy, fractional separation, thermal analysis, and physical properties, including textile properties. Generally, the textile properties of the fibrous copolymers were improved as compared with the properties of cotton products. 

Recently, scanning electron microscopy has been used in our laboratory to investigate the effects of abrasion on the morphology of fibrous cellulose copolymers (36). For example, cotton cellulose was woven into fabric form (print cloth construction and weight). Cellulose copolymer fabrics were prepared by irradiating a sample of this fabric, followed by copolymerization of the irradiated fabric with a binary mixture of acrylo-... 

Figure 2. Scanning electron microscopy textile 4-4842, cotton fiber with cinnabar pigment (186X)...

Scanning Electron Microscopy. Fiber samples were taken before and after treatments and observed under the microscope. Fibers were selected randomly, and no attempt was made to statistically document the findings. Figures 2 and 3 illustrate some of the noted characteristics of the cotton fibers. Figure 2 shows a cotton fiber from... 

M. L. Cotton, D. W. Wu, and E. B. Vadas, Drug-excipient interaction study of enalapril maleate using thermal analysis and scanning electron microscopy, Int. J. Pharm. 40, 129-142(1987). 

In an attempt to document the effect of the deep ocean environment on textile materials, modem materials were immersed at the site on the ocean floor for subsequent retrieval. While one set of samples was recovered after a three month period, additional samples have remained on the ocean floor since 1991 and are yet to be retrieved. The morphology of cellulosic fibers immersed for a three-month period has been investigated (S), The physical and chemical structure of dyed and undyed cotton fibers from the site compared with those of modem cotton and of cotton immersed on the ocean floor for three months were reported (70,77). Results of preliminary analyses on silk fibers using differential scanning calorimetry, energy dispersive x-ray spectoscopy, and scanning electron microscopy, have been reported (72). 

The untreated cellulose substrates were examined by scanning electron microscopy prior to the autoclave experiments. The dissolving pulp (Figure la) and the cotton fibers have textured surfaces with clearly visible fibrils. The lyocell fibers on the other hand are nearly devoid of surface features (Figure lb). The cellophane film has a completely flat surface with a few spherical shaped inhomogeneities, while the cellulose membranes display distinct porous structures. The 1.0 pm cellulose membranes were clearly inhomogeneous, with large flat areas interspersed with porous structures. 

Figure 14.3 Scanning electron microscopy (SEM) image of a cotton fiber coated with silver nanoparticles.

The cotton samples were also examined by scanning electron microscopy, using a Hitachi S530 instrument. 

Fibers of the control and selected chemically modified cottons were examined techniques of optical microscopy described previously.Ultra thin cross sections of the fibers were subjected to layer expansion by polymerization of methyl methacrylate and to solubility tests in 0.5 M cupriethylenediamine (cuene) and were examined by the techniques of transmission electron microscopy as previously reported.Scanning electron micrographs of fibers of selected samples before and after subjection to various solvents were also obtained. 

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