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Morsy, M., et al. (2014). Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 132, 594-598.
Multi-walled carbon nanotubes (MWCNTs) can appear in the form of coaxial assemblies of single-walled carbon nanotubes similar to coaxial cables, or in the form of a single sheet of graphite rolled into a scroll shape. Its applications cover many research areas.
Synthesis and Purification of MWCNTs
a. Multi-walled carbon nanotubes were synthesized by catalytic CVD method using a fixed-bed laboratory reactor. 100 mg of ferrocene catalyst was placed inside a ceramic boat, which was loaded into the preheating zone.
b. The temperature of the hot zone was increased to 800 °C under an argon flow rate of 750sccm.
c. Once the temperature of the hot zone reached 800 °C, the temperature of the preheating zone was increased to 200 °C, which is considered to be much higher than the sublimation temperature of ferrocene (174 °C).
d. At the same time, the peristaltic pump was turned on to continuously feed xylene into the three-necked flask (inside the heating furnace) to convert it into vapor.
e. The xylene vapor was allowed to flow for 30 minutes, and then the furnace was cooled to 400 °C under the Ar flow.
f. At 400 °C, the carrier gas was switched to oxygen to burn off the amorphous carbon. The carbonaceous material was deposited on the wall of the collected quartz tube in the form of a black film.
g. After synthesis, 500 mg of the grown MWCNTs were suspended in 50 ml of a 3:1 mixture of concentrated H2SO4 and HNO3 solutions and sonicated in a water bath for 2 h.
Subsequently, the purified carbon nanotubes (MWCNTs) were washed several times with distilled water and dried at 110 °C overnight.
Boncel, S., Zając, P., & Koziol, K. K. (2013). Journal of Controlled Release, 169(1-2), 126-140.
Since oxidized MWCNTs (O-MWCNTs) can be enzymatically degraded and excreted by the kidneys in humans, they can be considered as one of the most suitable drug nanocarriers.
Drug Release of Drug Delivery System Based on pH Response MWCNT
pH-responsive drug delivery systems (pH RDDS) are of high importance as they are able to release drugs at specific times and/or locations in the patient's body depending on the environmental acidity. This relationship enables direct control of the drug release rate.
Considering the behavior of non-covalent "MWCNT-drug" hybrids in aqueous environments, changes in pH primarily affect drug molecules by altering the hydrophilicity of their protonated versus non-protonated forms due to the low affinity of protons for aromatic π-systems.
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