Showing papers by "Caroline L. Schauer published in 2008"
TL;DR: An overview of applications of nanofibrous biopolymer mats created by the electrospinning process is discussed in this article, where an introduction to biopolymers and the electro spinning process are discussed.
Abstract: Electrospinning is a fabrication technique, which can be used to create nanofibrous non‐wovens from a variety of starting materials. The structure, chemical and mechanical stability, functionality, and other properties of the mats can be modified to match end applications. In this review, an introduction to biopolymers and the electrospinning process, as well as an overview of applications of nanofibrous biopolymer mats created by the electrospinning process will be discussed. Biopolymers will include polysaccharides (cellulose, chitin, chitosan, dextrose), proteins (collagen, gelatin, silk, etc.), DNA, as well as some biopolymer derivatives and composites.
721 citations
TL;DR: Poor cross-linking and a limited anchoring ability of CMC led to the inability to immobilize the catalyst materials effectively, which indicates that the carboxymethyl groups did not change nanoparticle formation.
190 citations
TL;DR: In this paper, a chitosan-poly(ethylene oxide) copolymer blend was electrospun and crosslinked with glutaraldehyde (GA) for various time periods.
Abstract: Mechanical characterization of nanofiber mats is an underexplored area in biomaterial engineering. In this study, a chitosan–poly(ethylene oxide) copolymer blend was electrospun and crosslinked with glutaraldehyde (GA) for various time periods. The tensile and compressive mechanical integrity of the nanofibers was analyzed with increasing exposure to vapor crosslinking. Solubility, scanning electron microscopy characterization, Fourier transform infrared, uniaxial tensile tests, and nanoindentation analyses were used to identify these trends. The mechanical studies confirmed that the GA vapor crosslinking increased the stiffness and decreased the ductility of the electrospun mats. Increased exposure time to crosslinking led to changes in the mat surface color and resistance to dissolution. Scanning electron microscopy fiber counts verified that exposure to GA vapor crosslinking increased the average fiber diameter. By the use of vapor phase deposition, mechanical properties continued to change throughout the study. The crosslinking exposure time could be chosen to accommodate in vivo mechanical loading. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
64 citations
TL;DR: The potential for tuning film response was demonstrated by varying the concentration of sulfur groups in the thioglycolic acid conjugate, leading to increased specificity for Hg(II).
52 citations
TL;DR: Homogeneous chitosan films of various thicknesses (10-65 nm) were deposited on thin gold films through spin coating and the resulting interfaces were characterized using surface plasmon resonance (SPR), AFM, profilometry and cyclic voltammetry.
Abstract: Homogeneous chitosan films of various thicknesses (10–65 nm) were deposited on thin gold films through spin coating. The resulting interfaces were characterized using surface plasmon resonance (SPR), AFM, profilometry and cyclic voltammetry. The strong chelating properties of chitosan films to Fe3+ were investigated using cyclic voltammetry. Through SPR measurements, an affinity constant between chitosan and Fe3+ of 9.49 × 105 M−1 was determined with a detection limit as low as 250 ppb.
44 citations
TL;DR: The use of conductive-AFM nanolithography for altering and manipulating double-bond-terminated molecules on TiO2 surfaces suggests a range of applications, including selective immobilization and assembly of functionalized inorganic nanoparticles and biomolecules.
Abstract: We report on the nanopatterning of double-bond-terminated silane (5-hexenyltrichlorosilane, HTCS) molecules on titania (TiO2) using conductive atomic force microscopy (AFM). The influences of tip electrostatic potential and scanning velocity, relative humidity and of the repeated application of voltage on the topographic height, width, and hydrophilic and hydrophobic contrast of the resultant patterns were investigated. Tip voltage and tip velocity (v) were applied between −10 V ≤ Vtip ≤ +10 V and 100 nm/s ≤ v ≤ 2 μm/s during the lithography step(s), respectively. Average height and Lateral Force Mode (LFM) images of patterns were obtained with different values of (−10 V ≤ Vtip ≤ −7 V) and v (100 nm/s ≤ v ≤ 2 μm/s). The average height of the patterns is seen to decrease for increasing v and decreasing Vtip in both a single or repeated lithography step. No patterns were observed following a single or repeated lithography step for −5 V ≤ Vtip ≤ +10 V. This conductive lithography technique results in nanosca...
11 citations