Organoclay Pluronic F68 – Montmorillonite, as a Sustained Release Drug Delivery Vehicle for Propranolol Hydrochloride

Seema, Seema; Datta, Monika

doi:10.17628/ecb.2014.3.593-604

Cited by 1 publication

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“…47 A strong absorption band at 2883 cm −1 was observed because of C−CH 3 stretching vibration of PF-68. 47 The characteristic peaks at 958 and 1096 cm −1 in PF-68 were observed because of C−O symmetrical and asymmetrical stretching vibrations of ether groups. The peak at 1279 cm −1 was assigned to −CH 2 group vibration of PF-68.…”

Section: Resultsmentioning

confidence: 93%

“…The PADDS exhibited a transmittance peak of diazonium N 2 + molecules at 2179 cm –1 . Next, the FT-IR spectrum of the PF-68 polymer (Figure S2c) showed a small intense band at 3454 cm –1 because of the vibrations of hydroxyl (−OH) groups . A strong absorption band at 2883 cm –1 was observed because of C–CH 3 stretching vibration of PF-68 .…”

Section: Resultsmentioning

confidence: 99%

“…Next, the FT-IR spectrum of the PF-68 polymer (Figure S2c) showed a small intense band at 3454 cm –1 because of the vibrations of hydroxyl (−OH) groups . A strong absorption band at 2883 cm –1 was observed because of C–CH 3 stretching vibration of PF-68 . The characteristic peaks at 958 and 1096 cm –1 in PF-68 were observed because of C–O symmetrical and asymmetrical stretching vibrations of ether groups.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic peaks at 958 and 1096 cm –1 in PF-68 were observed because of C–O symmetrical and asymmetrical stretching vibrations of ether groups. The peak at 1279 cm –1 was assigned to −CH 2 group vibration of PF-68 . When we look at the FT-IR spectrum of s-SWCNTs (Figure b, curve ii) and m-SWCNTs (Figure b, curve iii), PADDS (Figure b, curve i) peaks completely disappeared after the reaction with SWCNTs…”

Section: Resultsmentioning

confidence: 99%

“…The peak at 1279 cm −1 was assigned to −CH 2 group vibration of PF-68. 47 When we look at the FT-IR spectrum of s-SWCNTs (Figure 2b, curve ii) and m-SWCNTs (Figure 2b, curve iii), PADDS (Figure 2b, curve i) peaks completely disappeared after the reaction with SWCNTs. 45 In the following section, we have discussed about the alignment of separated nanotubes (see Experimental Section 4).…”

Section: Resultsmentioning

confidence: 99%

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Selective Chemistry-Based Separation of Semiconducting Single-Walled Carbon Nanotubes and Alignment of the Nanotube Array Network under Electric Field for Field-Effect Transistor Applications

et al. 2021

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Semiconducting single-walled carbon nanotubes (s-SWCNTs) are considered as a replacement for silicon in fieldeffect transistors (FETs), solar cells, logic circuits, and so forth, because of their outstanding electronic, optical, and mechanical properties. Herein, we have studied the reaction of pristine SWCNTs dispersed in a pluronic F-68 (PF-68) polymer solution with para-amino diphenylamine diazonium sulfate (PADDS) to separate nanotubes based on their metallicity. The preferential selectivity of the reactions was monitored by changes in the semiconducting (S 22 and S 33 ) and metallic (M 11 ) bands by ultraviolet−visible−near infrared spectroscopy. Metallic selectivity depended on the concentrations of PADDS, reaction time, and the solution pH. Furthermore, separation of pure s-SWCNTs was confirmed by Raman spectroscopy and Fourier-transform infrared spectroscopy. After the removal of metallic SWCNTs, direct current electric field was applied to the pure s-SWCNT solution, which effectively directed the nanotubes to align in one direction as nanotube arrays with a longer length and high density. After that, electrically aligned s-SWCNT solution was cast on a silicon substrate, and the length of the nanotube arrays was measured as ∼2 to ∼14 μm with an areal density of ∼2 to ∼20 tubes/μm of s-SWCNTs. Next, electrically aligned s-SWCNT arrays were deposited on the channel of the FET device by drop-casting. Field-emission scanning electron microscopy and electrical measurements have been carried out to test the performance of the aligned s-SWCNTs/FETs. The fabricated FETs with a channel length of 10 μm showed stable electrical properties with a field-effect mobility of 30.4 cm 2 /Vs and a log 10 (I on /I off ) current ratio of 3.96. We envisage that this new chemical-based separation method and electric field-assisted alignment could be useful to obtain a high-purity and aligned s-SWCNT array network for the fabrication of high-performance FETs to use in digital and analog electronics.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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