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2 Materials Science Poland

2 2004

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Pamoate intercalated Zn-Al layered double hydroxide for the formation of layered organic-inorganic intercalate

100%

Hussein M. Z. , Jubri Z. B. , Zainal Z. , Yahya A. H.

tom Vol. 22, No. 1

57--67

A layered organic-inorganic intercalate was prepared by the self-assembly technique using pamoate (PA) as an organic guest in the Zn-Al layered double hydroxide inorganic host (ZAPAN). Various concentrations of PA, ranging from 0.01 to 0.04 M, were used to prepare the intercalated compound with a constant 4:1 ratio of Zn:Al in the mother liquor. The concentration of PA of 0.02 M at pH 7 was found to give a well-ordered nanolayered organic-inorganic hybrid structure. As a result of successful intercalation of PA anion into the Zn-Al inorganic layered double hydroxide (LDH), the expansion of interlayer spacing to 18 A was observed in the PXRD diffractogram of the intercalated compound, compared to 9 A for the Zn-Al LDH with nitrate as the counter anion (ZANIL). FTIR study shows that the intercalated compound resembled the spectra of PA and ZANIL, thus indicating the presence of both functional groups in ZAPAN. It was also found that the BET surface area increased from 6 m2/g to 90 m2/g for ZANIL and ZAPAN, respectively. The pore texture of the resulting materials was also changed as the result of the intercalation and the expansion of the basal spacing together with pore formation between the crystallite during the formation of the resulting layered intercalated compound.

Photoelectrochemical properties of sol-gel derived TiO2 thin films in aqueous sodium oxalate solution

100%

Zainal Z. , Lee C. Y. , Hussein M. Z. , Kassim A.

tom Vol. 22, No. 2

99--110

Photoelectrooxidation of aqueous sodium oxalate on TiO2 thin films has been investigated. The films, prepared by sol-gel dip-coating, were characterised using Scanning Electron Microscopy and X-ray Diffractometry. Photosensitivity of samples was studied using Linear Sweep Voltammetry and Chronoamperometry techniques. The photoelectrochemical performance of thin film electrodes was evaluated in function of heat treatment, number of dip-coatings and applied potential. The percentage of oxalate degradation was determined by calculating the total charge from the photocurrent. The films heat-treated at 773 K were better fitted to indirect optical transition with Eg = 3.21 eV.