• NUR NADIA DZULKIFLI

      Articles written in Bulletin of Materials Science

    • Characterization, physiochemical, controlled release studies of zinc–aluminium layered double hydroxide and zinc layered hydroxide intercalated with salicylic acid

      NURAIN ADAM SHEIKH AHMAD IZADDIN SHEIKH MOHD GHAZALI NUR NADIA DZULKIFLI CIK ROHAIDA CHE HAK

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      Intercalation of salicylic acid (SA) into the interlayer region of zinc/aluminium-layered double hydroxides(LDHs) and zinc layered hydroxides (ZLH) was studied. Fourier transform infrared-attenuated total reflectance (FTIRATR) shows the presence of nanocomposites peak at 3381 cm$^{-1}$ for OH group, 1641 and 1640 cm$^{-1}$ C=O vibration mode indicates that SA is intercalated between the layered structures. Powder X-ray diffraction (PXRD) analysis shows the presence of new peak at lower region of 2${\theta}$ with calculated basal spacing of 16.3 A° for LDSA and 16.15 A° for ZLSA.CHNS analysis stated that the percentage of carbon was increased from 0 to 15.09% in LDSA and 21.85% in ZLSA.Thermogravimetric analysis/derivative thermogravimetric (TGA/DTG) test shows that SA was thermally stable due toincrease in decomposition temperature from 204$^{\circ}$C for pure salicylic compound to 405$^{\circ}$C in LDSA and 426$^{\circ}$C in ZLSA,respectively. Field emission scanning electron microscope (FESEM) images show that the nanocomposites are more compact, flaky non-porous, large agglomerates with smooth surfaces of the intercalated compound. Controlled release was successful which follows pseudo-second order from phosphate > carbonate > chloride.

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