Synthesis of zinc oxide nanorods, sheets and flower like structure were done by the sol-gel method using zinc acetate dihydrate and sodium hydroxide at with 12 hours refluxing time nanorods, in case of as synthesized powder, with diameter of 20-60nm. Annealing at higher temperature (300 and ,) in air ambient changes the morphology to sheet and flower like structure. The standard peak of zinc oxide was observed in IR at . The UV-VIS spectroscopy of zinc oxide shows a characteristic peak at 375nm.

ZnO-Bi2O3-CoO-Sb2O3와 ZnO-Bi2O3-CoO-Sb2O3-Cr2O3계에서 미세구조 변화 및 전기적 특성에 미치는 개재물의 영향을 조사하였다. 소결동안에 ZnO입자 성장은 스피넬 입자들에 의해 제어되었으며, 스피넬 입자들의 양의 증가에 의해 입자성장은 감소하였다. Cr2O3(0.5mol%)의 첨가는 비직선성지수에는 큰 영향을 미치지 못하였으며 임계전압(breakdown voltage)을 증가시켰다. 계산에 의해 구한 장벽전압은 ZnO-Bi2O3-CoO-Sb2O3와 ZnO-Bi2O3-CoO-Sb2O3-Cr2O3 계에서 각각 3.1V와 2.9V이었다.

Background : For the green approach of nanoparticles synthesizing, plant based technology has been considered as cost-effective and eco-friendly mass production. The oriental medicinal crop, Kalopanax septemlobus (Thunb.) Koidz. (Korean name: 음나무), the deciduous tree and a family of Araliaceae. Endemic tree of Asian countries, K. septemlobus being used for the treatment of various diseases. Phytochemicals of K. septemlobus such as polyphenols has highly probability of reducing agent for biosynthesizing nanoparticles. Methods and Results : In this study, we applied K. septemlobus ZnO nanoparticles (Ks-ZnO NPs) with procedures including green approach one-pot synthesis. For the characterization of nanoparticles, UV–Vis, FTIR, XRD, SEM and TEM were used. The formation of ZnO nanoparticles, the aurface plasmon resonance were observed at 372 ㎚ in UV-Vis spectroscopy. The presence of functional groups which as a capping agent and formation of ZnO nanoparticles were confirmed in FTIR result. The crystallization and morphology showed by XRD, TEM and SEM respectively. The photocatalytic activity of ZnO nanoparticles, was determined using Methylene blue (MB) dye degradation under UV irradiation (365 ㎚) which resulted rate constant is (−k) 0.1215 with 97.5% of degradation in 30 min. Conclusion : The result shows that phytochemicals in K. septemlobus extract have a potential as a reducing agent to form ZnO nanoparticles. The ZnO NPs are capable to degrade MB with in brief time.

Background : Panos extract is a mixture of four Panax plant extracts namely Dendropanax morbifera, Panax ginseng, Acanthopanax senticosus and Kalopanax septemlobus. We intended to use Panos extract for ZnO nanoparticles(NPs) synthesis and application for waste water treatment. Methods and Results : In the present study, we have synthesized Panos ZnO nanoparticles via co precipitation method. Characterization of the NPs has been done using X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR) and UV-Visible spectroscopy. An average of 75% efficacy in degrading the methylene blue dye has been observed. The nanoparticles showed antibacterial activity against E. coli and S. aureus. Conclusion : The results shows that Panos ZnO NPs can be a potential eco-friendly and economical tool for waste water management in the current scenario where there an intense urge to remediate the polluted environment through novel approaches such as Nanobiotechnology.

Background : Among medicinal plant sources, Abeliophyllum distichum is widely used in traditional Korean medicine. we report on the synthesis of nanostructured zinc oxide particles by both chemical and biological method. Highly stable and spherical zinc oxide nanoparticles are produced by using zinc nitrate and Abeliophyllum distichum leaf extract. Methods and Results : Zinc oxide (Ad-ZnONPs) nanoparticles synthesized from Abeliophyllum distichum at room temperature by aqueous extract of dried leaf and stem. The plant endemic in Korea alone and it is a monotypic flowering plant genus of olive family, Oleaceae. Catalytic and toxicity effect against human keratinocyte and adenocarcninomic human alveoloar. Ultra violet visible (UV-Vis) spectroscopy, field emission transmission electron microscopy (FE-TEM), energy-dispersive X-ray (EDX) spectroscopy, elemental mapping, X-Ray powder diffraction (XRD), selected area electron diffraction (SAED) and Fourier transform infrared (FTIR) spectroscopy were engaged to illustrate the biosynthesized nanoparticles. The Zn-AdNPs has the ability in catalytic action and the cytotoxicity agent against different cell lines as investigated by 3-(4,5-Dimethylthiazol-2-yl)-2,5-Diphenyltetrazolium bromide (MTT) assay Conclusion : The present studies reveals that facile approaching the biological synthesis of zinc oxide nanoparticles by using the A. distichum leaf and stem extract, which is revealed that recyclable method. The method is well suited for the green synthesis and dual function molecule as reducing agent and stabilizing agent for synthesis of nanoparticles. The nanoparticles also showing promising biological activities.

산화아연은 뛰어난 자외선 산란효과로 인해 자외선 차단 화장품에 널리 이용되고 있다. 최근 화장품용으로 쓰이는 산화아연은 자외선 차단 특성, 사용감, 광촉매 활성 저하, 분산성 및 안정성 등을 보다 우수하게 하기 위해 이산화규소 등의 물질로 표면처리 하는 방법이 시행되어지고 있다. 본 연구에서는 광 노화의 원인인 자외선을 차단하는 이산화규소가 코팅된 산화아연 복합 분체를 개발하였다. 화장품 업계에서 일반적으로 쓰이는 마이크로 크기의 산화아연에 사용감, 자외선 차단 특성을 보다 우수하게 하기 위해 산업적인 용도로 많이 쓰이는 규산나트륨을 사용하여 코팅하였다. 이산화규소를 코팅하기 위해 규산나트륨과 산의 가수분해 반응에 의한 수열합성법을 적용하였다. 제조된 복합 분체의 자외선 차단 효과는 UV-Vis과 in-vitro 측정을 통하여 평가하였다. 또한 화장품에 실제 적용 하였을 때의 실질적인 장점을 확인하기 위해 사용자 관능 평가를 통해 비교분석 하였다.

The characteristics of photocatalytic degradation of tar colorants such as brilliant blue FCF(BBF) and tartrazine(TTZ) with zinc oxide suspension was studied in a batch reactor under irradiation of ultra-violet ray. Photocatalytic degradation of TTZ with ZnO was more higher than that of BBF, and was increased with dosage of ZnO below 5g, but was nearly affected with initial pH of two tar colorants aqueous solution. Ammonium persulfate was more effective oxidant than potassium bromate which slightly increased the degradation of BBF, but not increased the degradation of TTZ. The photocatalytic degradation rates of BBF and TTZ were pseudo-first order with rate constants of 0.0066, 0.0092 and 0.015min-1 for BBF, 0.042, 0.077 and 0.110min-1 for TTZ at the dosage of 1, 2 and 5g ZnO, respectively.

An experimental research was preformed for the development of an effective process for zinc oxide waste(zinc ash) reuse. Zinc was selectively leached from zinc ash by 30 vol.% D_2EHPA in kerosine solution, and the leaching velocity was quite fast. Zinc leached was stripped by sulfuric acid solutions, and the amount of zinc stripped was linearly increased with the amount of sulfuric acid used. Zinc oxide fine particles were obtained by dropwise adding of sodium hydroxide solution to the resultant aqueous zinc solution at 85℃.