Unbreakable Solid-Phase Microextraction Fibers Obtained by Sol−Gel Deposition on Titanium Wire

Abstract

Solid-phase microextraction commercial fibers present a few drawbacks such as relatively low recommended operating temperature, instability and swelling in organic solvents, breakage of the fiber, stripping of coatings, and bending of the needle. Some of these problems have been obviated by covalent bonding of the polymer phase to the fused-silica substrate by sol-gel, but the easy breakage of the fiber remains a problem. In the present work, the known occurrence of titanol groups at the surface of titanium wire was exploited to produce sol-gel fibers supported on this unbreakable substrate. Scanning electron microscopy analysis revealed the film formation on titanium wire surface while temperature and solvent stability as well as durability tests showed that the sol-gel film was tightly attached to the substrate, thus suggesting covalent bonding. The use of this type of fiber is currently generalized in our laboratory without any breakage or stripping out incidents up to the moment.

Array capillary in-tube solid-phase microextraction: A rapid preparation technique for water samples

“…The PDMS extraction phase was prepared by sol-gel method [26][27][28]. Phenyltriethoxysilane (PTES) was also added as the precursor to introduce -interaction between the PAHs and the phenyl group in the sol-gel network.…”

Application of poly(dimethylsiloxane) fiber sol–gel coated onto NiTi alloy electrodeposited with zirconium oxide for the determination of organochlorine pesticides in herbal infusions

“…Following the proposal of Azenha et al [16], the metallic support (NiTi without the ZrO 2 film) was activated with 1.0 mol/L NaOH for 1 h, followed by 0.1 mol/L HCl, water, and methanol, and used as a substrate for the solgel coating procedure. The micrographs of these fibers are shown in Fig.…”

A Sensitive Method for the Determination of Methadone in Biological Samples Using Nano-Structured α-Carboxy Polypyrrol as a Sorbent of SPME

“…Recently, many studies dealing with the development of innovative coatings based on the use of sol-gel materials [1][2][3], molecular recognition materials [4][5][6][7] and new unbreakable fibers [8][9][10] have been reported. Serious consideration has also been focused on the use of conducting polymers to be electrodeposited on metal wires as SPME supports [11][12][13].…”