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Structural and Optical Properties of Zinc Borotellurite Glass Co-Doped with Lanthanum and Silver Oxide

Journal of Materials Science and Chemical Engineering 2018年第4期6卷 18-23页

作者： Faznny Mohd Fudzi Halimah Mohamed Kamari Farah Diana Muhammad amirah abd latif Zaitizila Ismail Glass and Dielectric Lab Physics Department Faculty of Science Universiti Putra Malaysia Serdang Malaysia Photonic Lab Physics Department Faculty of Science Universiti Putra Malaysia Serdang Malaysia

A series of zinc borotellurite glass co-doped with lanthanum and silver oxide with the chemical formula of [{[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}0.96(La2O3)0.04]1-x(Ag2O)x where the molar frac-tion of silver oxide, x = 0.02, 0.04, 0.06, 0.08 and 0.10 had been successfully prepared via the conventional melt-quenching technique. The structural properties of the glasses were unveiled through X-ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) spectroscopy while optical properties of the glasses were investigated with Ultra Violet Visible (UV-Vis) spectropho-toscopy. The short range periodic atomic arrangement in the glass matrix that implies the amorphous nature of the glass was confirmed with the presence of a broad hump in the XRD pattern. On the other hand, the three absorption bands observable in the FTIR spectra had proven the existence of BO4, BO3 as well as TeO4 units in the glass network. The absorbance values retrieved from UV-Vis spectroscopy were utilized to calculate the indirect energy band gap and Urbach energy values of the fabricated glass. By employing the equations proposed by Mott and Davis, the obtained indirect energy band gap have val-ues ranging from 2.16 to 4.16 *** decreasing trend in indirect energy band gap and increasing Urbach energy values were related to the increasing num-ber of nonbridging oxygen (NBO) in the glass that is created from the breaking of Te-O-Te or B-O-B bonds after lanthanum as well as silver oxide are incor-porated into the zinc borotellurite glass network.

关键词： Zinc Borotellurite Glass Lanthanum Oxide Silver Oxide Optical Band Gap Urbach Energy

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Antimicrobial activity and essential oils of Curcuma aeruginosa,Curcuma mangga,and Zingiber cassumunar from Malaysia

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Asian Pacific Journal of Tropical Medicine 2012年第3期5卷 202-209页

作者： Tg Siti amirah Tg Kamazeri Othman abd Samah Muhammad Taher Deny Susanti Haitham Qaralleh Department of Biomedical Science Kulliyyah of ScienceInternational Islamic University MalaysiaJalan IstanaBandar Indera Mahkota25200 KuantanPahangMalaysia Kulliyyah of Pharmacy International Islamic University MalaysiaJalan IstanaBandar Indera Mahkota25200 KuantanPahangMalaysia

Objective:To analyze the chemical composition of the essential oils of Curcuma aeruginosa (***),Curcuma mangga(***),and Zingiber cassumunar(***). and study their antimicrobial ***:Essential oils obtained by steam distillation were analyzed by gas chromatography-mass speclrometry(GC-MS).The antimicrobial activity of the essential oils was evaluated against four bacteria:Bacillus cereus(***).Staphylococcus aureus(***).Escherichia coli(***).and Pseudomonas aeruginosa(***);and two fungi:Candida albicans(***) and Cyptococcus neoformans(***),using disc-diffusion and broth microdilution ***:Cycloisolongifolene,8.9-dehydro-9- formyl(35.29%) and dihydrocoslunolide(22.51%) were the major compounds in *** oil; whereas caryophyllene oxide(18.71%) and caryophyllene(12.69%) were the major compounds in *** oil:and 2,6.9,9-tetramethyl-2.6.10-cycloundecatrien-1-one(60.77%) andα-caryophyllene(23.92%) were abundant in *** *** essential oils displayed varying degrees of antimicrobial activity against all lested *** oil had the highest and most broad-spectrum activity by inhibiting all microorganisms tested,with *** being the most sensitive microorganism by having the lowest minimum inhibitory concentration(MIC) and minimum fungicidal concentration(MFC) values of 0.1μL/mL. *** oil showed mild antimicrobial activity,whereas *** had very low or weak activity against the tested ***:The preliminary results suggest promising antimicrobial properties of *** and ***,which may be useful for food preservation,pharmaceutical treatment and natural therapies.

关键词： Antimicrobial Gas chromatography-mass spectrometry Essential oil Curcuma aeruginosa Curcuma mangga Zingiber cassumunar

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