Dahlang Tahir

Hasanuddin University, Physics, Faculty Member

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Dr. Dahlang Tahir is a full professor in Physics Department, Hasanuddin University in Indonesia. He received Ph.D in 2010 in Physics Department, Chungbuk National University (CBNU) in KOREA. His research interest cover lightweight materials, carbon based multifunctional composites and semiconductor. He has published 92 papers and 1 patent.

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Papers by Dahlang Tahir

Hydroxyapatite based for bone tissue engineering: innovation and new insights in 3D printing technology

Polymer Bulletin

Evaluation occupationally radiation exposure during diagnostic imaging examinations

Applied Radiation and Isotopes

Studies on Surface Morphology of Irreversible Hydrocolloid Impression Material Based on Brown Algae Type Padina sp

IOP Conference Series: Materials Science and Engineering, 2019

This study aimed to investigate the potential of brown algae (Padina sp.). The investigation focu... more This study aimed to investigate the potential of brown algae (Padina sp.). The investigation focused on surface morphology of the brown algae as preparation for making sodium alginate-based impression materials to obtain standardized impression materials. The sample was a natural sodium alginate type Padina sp. taken from South Sulawesi, Indonesia. The extraction process was conducted to attain the sodium alginate extract. Subsequently, an irreversible hydrocolloid impression material was fabricated by mixing some of the impression material composition and sodium alginate from Padina sp. The test of physical characteristic was conducted by describing the surface morphology of impression materials using scanning electron microscope (SEM). The data analysis of the SEM images showed that there was a difference in the surface morphology structure of the impression materials of the brown algae of the type of Padina sp. and standard impression materials showing a rough surface. Furthermore, the particles had no binding with other particles for all samples.

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Composition dependence of dielectric and optical properties of Hf-Zr-silicate thin films grown on Si(100) by atomic layer deposition

Thin Solid Films, 2016

<Abstract> Composition dependence of the dielectric and optical properties of (HfZrO 4) (1-x) (Si... more <Abstract> Composition dependence of the dielectric and optical properties of (HfZrO 4) (1-x) (SiO 2) (x) (0≤x≤0.2) gate dielectric thin films, grown on Si(100) by the atomic layer deposition method, was investigated by means of reflection electron energy loss spectroscopy (REELS). The quantitative analysis of REELS spectra was carried out by using the QUASES-XS-REELS and QUEELS-ε(k,ω)-REELS software, which determine the dielectric function and optical properties through an analysis of experimental REELS in terms of a simulated energy loss function (ELF).

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Composite Fayalite with 5% Laterite Soil and Iron Sand: Structural Properties and Band Gap Calculation Based on Theoretical Kubelka–Munk, Taylor Expansion, and Self-Consistent Field Method

JOM

Bibliometric analysis of chitosan research for wastewater treatment: a review

Environmental Monitoring and Assessment

$Research paper thumbnail of Nanocrystal composite (CoFe2O4)/(Mg) for photocatalyst of methylene blue and Congo red: stability structural properties from X-ray diffraction and chemical bonding from infra-red spectroscopy$

Nanocrystal composite (CoFe2O4)/(Mg) for photocatalyst of methylene blue and Congo red: stability structural properties from X-ray diffraction and chemical bonding from infra-red spectroscopy

Journal of Materials Research

Flexible Fe2O3/BaCO3/polyvinyl alcohol apron for enhanced absorption X-ray performance: structural properties and bonding characteristics as a function of calcination temperature

Applied Physics A

Reflection electron energy loss spectroscopy during initial stages of Ge growth on Si by molecular beam epitaxy

Applied Physics Letters, 1991

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Assessment of male patients’ average glandular dose during mammography procedure

Applied Radiation and Isotopes

Development trans-N-benzyl hydroxyl cinnamamide based compounds from cinnamic acids and characteristics anticancer potency

Journal of the Iranian Chemical Society, 2022

The derivatization of three hydroxycinnamamides becomes trans-N-benzylhydroxycinnamamides, and th... more The derivatization of three hydroxycinnamamides becomes trans-N-benzylhydroxycinnamamides, and their potential assay as anticancer agents has been carried out. N-benzyl-p-coumaramide (5a), N-benzylcaffeamide (5b), and N-benzylferulamide (5c) were obtained from p-coumaric, caffeic, and ferulic acid, respectively, with benzylamine via four reaction steps, i.e., acetylation, chlorination, amidation, and deacetylation. All products characterize using FTIR, 1H-NMR, and 13C-NMR spectroscopy, and their cytotoxicity were tested against P388 leukemia murine cells by MTT method. Although compound 5b and 5c have no and low anticancer activity with IC50 sequentially of 674.38 and 179.56 µg/mL, compound 5a showed potentially use as an anticancer agent with IC50 of 16.15 µg/mL Molecular modelling studies were performed to understand the interactions with the activity against murine leukemia P388 cells.

Radon (222Rn) Radioactivity Level at the BATAN Workplace using RAD7

Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon i... more Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon is a radioactive emitting alpha particle, very dangerous to the health because if it is inhaled, will be accumulated in the lungs and cause lung cancer. The purpose of the research was to determine the activity concentration of 222 Rn in the workplace and to estimate the dose received by workers. The sampling method is purposive sampling, in several office rooms of the BATAN office (staff room, laboratory, and warehouse), measurement 222 Rn using RAD7 continuously for 24 hours. Based on the activity concentration of 222 Rn in the rooms, an estimate of the effective dose received by the workers while working indoors can be calculated. The results showed that exposure of 222 Rn gas radiation in the workplace was relatively varied, radiation exposure in warehouses was 18.90-32.90 (25.90) Bq.m -3 higher than in laboratory 8.20-34.00 (22.43) Bq.m -3 and staff room 5.40-29.60 (16.68) Bq.m -3 . ...

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APPLICATION OF MEDAKA FISH Orizyas javanicus AS BIOINDICATOR OF Pb CONTENT IN WATERS

The research of the application of Oryziasjavanicus fish as bio-indicators of heavy metal polluti... more The research of the application of Oryziasjavanicus fish as bio-indicators of heavy metal pollution of lead (Pb) in the waters, was conducted in March-April 2015. The purpose of this study was to determine whether the medaka fish O.javanicus could be a biological indicator in pollutant waters, and to introduce O.javanicus for bioassay and bio-indicator. Sampling was done randomly by using gill nets at the mouth of the Jeneberang River in Makassar, South Sulawesi Province, Indonesia. The study was conducted at Medaka Study Center, Research Center Building, University of Hasanuddin, Makassar. We treated medakafish with different concentration of Pb 0 mg/L (as control); 0.01 mg/L (Treatment 1); 0.03 mg/L (Treatment 2) and 0.05 mg/L (Treatment 3). Parameters used in this study included survivorship and fish abnormalities behavior. At the end of experiment, Pb content in medaka was determined by EDXRF. The results showed that the higher the lead Pb concentration in media, the more Pb bei...

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Chlorine signal investigation in organic product as a pesticide residues by Laser Induced Breakdown Spectroscopy (LIBS)

Journal of Physics: Conference Series, 2019

We have been determined chlorine (Cl) spectra line as one of the most hazardous pesticide by usin... more We have been determined chlorine (Cl) spectra line as one of the most hazardous pesticide by using laser induced breakdown spectroscopy (LIBS) with various concentration of sodium chloride in cacao (1%, 3%, 5%, 7% and 10%). The experiment is carried out with a Nd-YAG laser system operating at a wavelength of 1064 nm, pulse energy is 150 μJ and various integration time are 10 ms, 50 ms and 80 ms. Based on the result, chlorine (Cl) line is detected at a wavelength of λ = 837,56 nm is enhancement slightly increasing with sodium chloride concentration in organic product. So, LIBS method is high potential for investigating of chlorine (Cl) residues in organic products

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Synthesis Ag nanoparticle by laser fragmentation for high sensitive ammonia residue detection

Journal of Physics: Conference Series, 2019

We have been synthesis silver nanoparticles by using chemical analysis and successfully reduce si... more We have been synthesis silver nanoparticles by using chemical analysis and successfully reduce silver nanoparticles by femtosecond laser fragmentation method with various silver nanoparticles size ranges from 60 - 75 nm, 10 - 35 nm and 9-17 nm. Characterization is carried out by Modular UV-Vis Spectrometer (MayaPro200, Ocean Optics) and Transmission Electron Microscope (TEM FEI Tecnai G20 S-Twin 200kV). Based on the results, silver nanoparticles (particles size are 9-17 nm) is high potential for detection of ammonia residues by ammonia PPM enhancement (10 PPM, 100 PPM, 150 PPM, 200 PPM, 250 PPM, 300 PPM, 350 PPM, 400 PPM, 450 PPM, and 500 PPM) and a maximum shift of absorbance at a wavelength of 433.39 nm, while TEM characterization have the structure is round.

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Karakteristik Diagram Pita Energi pada Lapisan Antarmuka (Interface) (GaInZnO)/SiO2/Si Menggunakan Spektroskopi Elektron sebagai Window layer pada Sel Surya

Silver nanoparticles (AgNPs) synthesis methods as heavy-metal sensors: a review

International Journal of Environmental Science and Technology

Effect of Fe3O4 in enhancement optical and gamma ray absorption properties of geopolymer apron cassava starch/black carbon/glycerin

Optical Materials

Abstract Geopolymer apron cassava starch/BC/Fe3O4/glycerin has been synthesized for various amoun... more Abstract Geopolymer apron cassava starch/BC/Fe3O4/glycerin has been synthesized for various amount of Fe3O4 (0.5%, 1%, and 1.5%) into cassava starch and black carbon (BC) solutions. The quantitative analysis from Fourier transforms infra-red (FTIR) was used to determine the optical properties, dielectric function, energy loss function, attenuation constant, and propagation constant. The higher value of the distance between two optical ((LO-TO)) phonon vibration, attenuation constant, propagation constant was strong correlation with higher absorption properties and higher mechanical properties. The effectiveness of radiation shielding also from the density, linear attenuation coefficient (μ), mass attenuation coefficient (μs), half value layer (HVL), and mean free path (MFP) from gamma radiation source IBT 103 Cs 137. The attenuation was 0.178 cm − 1 , sample density was 0.984 g/ cm 3 , HVL value was 3.893 cm, and MPF was 5.618 cm. The best characteristic in supporting composite performance as an apron applications are for 1.5% Fe3O4 in the composite. This study shows that the FTIR spectra could be useful for determining the optical properties, phonon vibration, dielectric function, energy loss function, attenuation constant, and propagation constant of composite apron cassava starch/BC/Fe3O4/glycerin.

Nanocrystal composites cement/BaCO3/Fe2O3 for improved X-ray shielding characteristics: Stability structural properties

Journal of Materials Research

Pelatihan Pembuatan Papan Iklan Dot-Matriks Berbasis Mikrokontroler DI SMKN 1 Wajo

Technological development in the manufacture of microcontroller-based dot-matrix billboards carri... more Technological development in the manufacture of microcontroller-based dot-matrix billboards carried out in the form of counseling and training for students at Wajo 1 State Vocational High School (SMK). The implementation of this training aims to increase the insight, knowledge, and skills of vocational school students, which are an educational level that must have different knowledge from the level of education in general. The method of implementing this activity includes site observation, preparation, counseling, and provision of materials related to physics and energy, entrepreneurship, optoelectronic technology, as well as the implementation of training on making Arduino microcontroller-based dot-matrix billboards and evaluating the training implementation. The result of this activity is an increase in the knowledge and insight of students in terms of making a series of dot-matrix billboards using electronic components, understanding program code, running the Arduino Integrated D...

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