Electrokinetics of Carbon Fibers Produced by a Direct Oxyfluorination

Abstract

PAN-based carbon fibers were treated by a direct oxyfluorination method to study the chemical surface composition and electrokinetic behavior of the fibers. The physicochemical properties of the fibers were investigated by using a photoelectron spectroscopy (XPS) and zeta (ζ)-potential. As a result, the surface functional groups, including C−O, CO, HO−CO, and C−F x after oxyfluorination, were formed on the carbon fiber surfaces. And the time dependence of the ζ-potential of oxyfluorinated carbon fibers reflected the surface bonding state of the obtained fiber materials, due to the dissociation of C−F x groups. These results could be explained by the modification of chemical composition and the formation of physical bonding on the fiber surfaces, which could be attributed to the oxyfluorination.

Recent Progress on Barium Titanate‐Based Ferroelectrics for Sensor Applications

“…Notably, in 2004, K. Park and collaborators made significant strides in gas sensing technology with their publication on a gas sensor incorporating BaTiO 3 for the purpose of carbon monoxide (CO) detection. [ 162 ] Their findings reveal a compelling relationship between the sensor's resistivity, measured in both high‐temperature air and varying CO gas concentrations, and the extent of graphite doping. Moreover, the sensitivity of CO gas detection is significantly enhanced through the augmentation of ferroelectric material porosity.…”

Adsorption of Surfactants on Polymer Surfaces Investigated with a Novel Zeta-Potential Measurement System

“…In recent years, zeta-potential measurements of fibrous polymer materials have become an important tool for surface characterisation in widespread areas of research, such as materials science, biomedical applications, textile finishing and papermaking processes [1][2][3][4]. In spite of its importance, the determination of electrokinetic properties like the zeta-potential of fibrous polymer samples with classical methods is laborious and time-consuming.…”

Ammonia removal of activated carbon fibers produced by oxyfluorination

“…This is the reason that much research has been focused on modifying the ACF surfaces by different methods such as chemical, mechanical, thermal, or electrical discharge. Among those techniques, one particularly promising technique is oxyfluorination (F 2 /O 2 ) [2][3][4].…”

“…Carbon-oxygen complexes show an acidic nature, and an acidic adsorbent has a strong interaction with a basic adsorbate due to the Lewis acid-base interaction [2,5] control of the surface functional groups and their acidity is a core technology in improving the capability of ACFs. Therefore, in this work, different conditions of oxyfluorination were applied to modify the surface properties of the ACFs, resulting in enhancement of their ammonia-removal capacity.…”

“…The treatment was performed in a batch reactor made of nickel. After evacuation, fluorine and oxygen mixtures (F 2 /O 2 = 30/30 kPa) were introduced to the reactor at room temperature [2,5]. The oxyfluorinated ACF samples denoted as FO-2, FO-5, and FO-10 were prepared at different treatment times: 2, 5, and 10 min, respectively.…”