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You searched for +publisher:"North Carolina State University" +contributor:("Dr. Saad Khan, Committee Co-Chair"). Showing records 1 – 2 of 2 total matches.

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North Carolina State University

1. Gupta, Amit. Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers.

Degree: PhD, Fiber and Polymer Science, 2009, North Carolina State University

Hydrogen bond forming polymers such as aliphatic polyamides and polyvinyl alcohol are important engineering plastics with good mechanical properties, high melting point and good chemical resistance. However, any further attempt at improving their mechanical properties gets thwarted due to the presence of intermolecular hydrogen bonding. Many approaches have been attempted in the past to suppress hydrogen bonding in aliphatic polyamides and have met with little or no success. These include, plasticizing the structure, dry spinning, wet spinning, gel spinning, and zone drawing/annealing. We have employed a new technique that involves the dry-jet wet spinning and drawing of GaCl3/nylon 66 complex. This new method allows traditional low draw ratios for nylon 66 to be increased by disrupting the interchain hydrogen bonded network. Fibers with a high modulus were obtained when high molecular weight nylon 66 was used. Further, we have also reviewed the concept of thermoreversible gelation and its application for gel spinning of ultra high molecular weight polyethylene fibers. We developed high strength and modulus nylon 6 and PVA fibers from the gels of these polymers in N-methyl pyrrolidinone. High molecular weight is essential for achieving more drawing of polymer chains which leads to high molecular orientation. Electrostatic spinning or electrospinning has received considerable research attention in recent years. It involves the application of an electric filed to a polymer solution or melt to facilitate production of fibers in the sub-micron down to nanometer range. We have investigated the complexation of GaCl3 with nylon 6 and developed porous nanofibers via the technique of electrospinning. Pores are generated by removal of salt from the as spun nanofibers via dipping in water. Researchers have tried in the past using a highly volatile solvent, or selective removal of one polymer from a bicomponent nanofiber for developing pores in nanofibers. However, using a metal salt proved to be a simple and fast approach for generating pores in electrospun nanofibers. Advisors/Committee Members: Dr. Samuel Hudson, Committee Member (advisor), Dr. Alan Tonelli, Committee Member (advisor), Dr. Saad Khan, Committee Co-Chair (advisor), Dr. Richard Kotek, Committee Chair (advisor).

Subjects/Keywords: Hydrogen Bonding; Gel Spinning; Nanofibers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gupta, A. (2009). Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/4526

Chicago Manual of Style (16th Edition):

Gupta, Amit. “Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers.” 2009. Doctoral Dissertation, North Carolina State University. Accessed April 15, 2021. http://www.lib.ncsu.edu/resolver/1840.16/4526.

MLA Handbook (7th Edition):

Gupta, Amit. “Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers.” 2009. Web. 15 Apr 2021.

Vancouver:

Gupta A. Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers. [Internet] [Doctoral dissertation]. North Carolina State University; 2009. [cited 2021 Apr 15]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/4526.

Council of Science Editors:

Gupta A. Novel Approaches to Fiber formation from Hydrogen Bond forming Polymers. [Doctoral Dissertation]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/4526


North Carolina State University

2. Satcher, Melinda Renee. De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles.

Degree: MS, Textile Engineering, 2006, North Carolina State University

Nanocomposite polyethylene oxide (PEO) fibers containing magnetic domains were produced using parallel plate electrospinning. The fibers were spun from solutions dosed with nanoparticles of magnetite (Fe3O4) in 2wt% PEO in water. Solution parameters like viscosity, conductivity, and surface tension were measured and correlated to final fiber diameter. Increased amounts of magnetic nanoparticles produced higher conductivity, higher viscosity, and lower surface tension solutions. Transmission electron microscopy and energy dispersive spectroscopy were used to analyze the diameters of the nanofibers as well as the distribution of the magnetic nanoparticles inside the PEO matrix. A SQUID magnetometer was applied to determine the AC and DC magnetic susceptibility of the fibers. The resultant nanofibers had diameters as low as 100 nm and exhibited unique AC susceptibility patterns and magnetic responses making them excellent for anti-counterfeiting applications. Advisors/Committee Members: Dr. Lei Qian, Committee Member (advisor), Dr. William Oxenham, Committee Member (advisor), Dr. Saad Khan, Committee Co-Chair (advisor), Dr. Juan Hinestroza, Committee Co-Chair (advisor).

Subjects/Keywords: electrospinning; nanofibers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Satcher, M. R. (2006). De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Satcher, Melinda Renee. “De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles.” 2006. Thesis, North Carolina State University. Accessed April 15, 2021. http://www.lib.ncsu.edu/resolver/1840.16/529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Satcher, Melinda Renee. “De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles.” 2006. Web. 15 Apr 2021.

Vancouver:

Satcher MR. De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles. [Internet] [Thesis]. North Carolina State University; 2006. [cited 2021 Apr 15]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Satcher MR. De-bottlenecking the Electrospinning Process Using Superparamagnetic Particles. [Thesis]. North Carolina State University; 2006. Available from: http://www.lib.ncsu.edu/resolver/1840.16/529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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