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A Study on the Spatial Composition of Apartment Balcony by Comparing Asian Cases
Tuz-Johora Fatama(투즈요호라 파타마),Kim, In-Sung(김인성) 한국주거학회 2023 한국주거학회 학술대회논문집 Vol.35 No.2
The balcony is the only private outdoor space in the apartment, connecting the indoor and outdoor spaces and offering the well-being of the living environment. The research compares and analyzes recent time apartment balcony designs in Korea, Bangladesh, and Singapore, considering the influence of climate and culture on their spatial organization. To develop a tool for comparative analysis, the characteristics and applications of space syntax and shape grammar were studied, and a balcony space organization diagram is obtained by synthesizing the grammar. The diagram visualizes the spatial organization of the balcony under a theoretical background rather than the actual scale or shape. Through this diagram, Balcony prototypes of each country have been extracted, and a more structured comparative analysis has been conducted. As a result of a comparative analysis of 19 balcony diagrams, differences in space organization were found. The study showed the diversity of recent design approaches of balconies in each country that have evolved over a long time amidst climatic and cultural differences, and it will be an opportunity to measure the future direction of apartment balconies.
Facile and safe graphene preparation on solution based platform
Fatima Tuz Johra,이지욱,정우광 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Graphene has attracted increasing attention because of its interesting properties. In this study, graphene was prepared from graphite by a very simple and easy process. The two-step protocol involves conversion of graphite to graphene oxide (GO) by oxidation, and subsequent reduction of GO to graphene. The structures and properties of the obtained GO and graphene were characterized via X-ray diffraction, and Raman, NMR, UV–vis absorption, and X-ray photoelectron spectroscopic techniques. The morphologies of these products were observed via field emission scanning electron microscopy. The preparation protocol is simple, easy, environmental friendly, i.e., nontoxic, and the yield of graphene is high.
Synthesis of Black Phosphorus via a Facile Vapor Transfer Method
Fatima Tuz Johra,Woo-Gwang Jung 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
Single-layer black phosphorus (BP), known as phosphorene, has recently attracted interest in research due to itsexceptional properties, similar to those of other 2D materials. BP is the most stable allotrope of phosphorus with highdensity. BP can be obtained from other phosphorus allotropes by a number of ways. Due to white phosphorus beinghighly reactive at ≥ 30 °C, researchers tend to work with red phosphorus (RP). In this work, RP powder was heatedunder an argon atmosphere inside a muffle furnace along with tin and iodine at sequential temperatures for differenttimes. All elements were placed inside a quartz ampoule evacuated with a vacuum pump. The ampoule was sealedafter substituting it with argon gas. This method, known as the vapor transfer method, allows to synthesize BP witha ribbon-like structure. FE-SEM analyses revealed that the morphological structure of BP comprised clearly-stackedsheets. The structural analysis of the as-synthesized BP, conducted by XRD, TEM and Raman, showed the successfultransformation of RP into BP.
Effect of Light-Ions Implantation on Resistivity of GaN Thin Film
Fatima Tuz Johra,정우광 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.4
GaN is a very well-known semiconductor because of its properties, making it useful in different types of electronic devices. In electronics applications, the resistivity of the starting materials is very important. In this study, the resistivity of GaN thin films has been investigated upon its modification with ion implantation using both n-type and p-type GaN. Ionic implantation was performed with H, He, and Ar ions. The ion beam energy (60 and 120 keV) and flux (1.0 × 1012 and 1.0 × 1015 cm−2·s−1), as well as post-implantation annealing temperature (100°C - 500°C), were varied to analyze their influence on GaN resistivity. It was observed that the resistivity changed in all samples with the change in ion beam flux and energy. At room temperature, the resistivity of ntype GaN increased from 1.9 × 10−2 to 17.7 × 10−2 Ω·cm. Among all modified samples, He-ion-implanted samples show higher resistivity. During the post-annealing treatment, n-type GaN implanted with He showed more consistency compared to p-type GaN. On the contrary, p-type showed some anomalous character upon postannealing.
Johra, Fatima Tuz,Jung, Woo-Gwang Materials Research Society of Korea 2021 한국재료학회지 Vol.31 No.4
Here, Zn ferrite is synthesized along with reduced graphene oxide (rGO) by a facile one-step hydrothermal method. The difference between the synthesized nanocomposites with those in other reported work is that the reaction conditions in this work are 160 ℃ for 12 h. The synthesized products are characterized by field-emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and attenuated total reflection. Further, the adsorption property of rGO-Zn ferrite (rGZF) nanocomposite is studied after confirming its successful synthesis. The adsorption capacity of rGZFs toward rhodamine B (RB) is > 9.3 mg/g, whereas that of bare ZF nanoparticles is 1.8 mg/g in aqueous media. The efficiencies of rGZF and bare ZF to remove RB are 99 % and 20 %, respectively. Employing rGZF, 60 % of RB is decomposed within 5 min. The kinetic study reveals that the adsorption process of removing RB by bare Zn ferrite follows pseudo-first-order kinetics. However, after zinc ferrite is incorporated with rGO, the kinetics changes to pseudo-second-order. Furthermore, the Langmuir isotherm is accomplished by the adsorption process employing rGZF, indicating that a monolayer adsorption process occurs. The thermodynamic parameters of the process are also calculated.
Facile and safe graphene preparation on solution based platform
Johra, Fatima Tuz,Lee, Jee-Wook,Jung, Woo-Gwang Elsevier 2014 Journal of industrial and engineering chemistry Vol.20 No.5
<P><B>Abstract</B></P> <P>Graphene has attracted increasing attention because of its interesting properties. In this study, graphene was prepared from graphite by a very simple and easy process. The two-step protocol involves conversion of graphite to graphene oxide (GO) by oxidation, and subsequent reduction of GO to graphene. The structures and properties of the obtained GO and graphene were characterized via X-ray diffraction, and Raman, NMR, UV–vis absorption, and X-ray photoelectron spectroscopic techniques. The morphologies of these products were observed via field emission scanning electron microscopy. The preparation protocol is simple, easy, environmental friendly, i.e., nontoxic, and the yield of graphene is high.</P> <P><B>Graphical abstract</B></P> <P>We have fabricated high quality grapheme material with facile and safe method. Graphene oxide (GO) was prepared by means of improved Hummers’ method, then subsequent reduction of GO was made with hydrothermal method to fabricate the grapheme material. The quality of graphene was characterized by many analytical measurements. We optimized the process condition on the basis of the quality of graphene.</P>