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. 2018 Jul 10;4(7):e00689. doi: 10.1016/j.heliyon.2018.e00689

Table 1.

Vibrational peak for raw untreated halloysite nanotubes (HNT), acid treated halloysite nanotube (ATHNT), drug loaded halloysite nanotube (DLHNT), acid treated drug loaded halloysite nanotube (ATDLHNT) and sodium salicylate drug (NaSA).

Sample -OH group Al-OH bending vibration Si-O stretching vibration Si-O bending vibration vPh-OH δPh-OH Vs-COO- vC-C ring
HNT 3640 908 1070 551 - - - -
ATHNT 3640 883 1070 575 - - - -
DLHNT 3640 908 1070 551 1244 1321 1387 1650
ATDLHNT 3640 883 1070 575 1244 1321 1387 1650
NaSA - - - - 1253 1343 1387 1650