http://repository.iti.ac.id/jspui/handle/123456789/354 A collection of check similarity from journal articles by the Academic Community of the Indonesian Institute of Technology (ITI) published by other institutions. 2026-04-23T21:26:30Z http://repository.iti.ac.id/jspui/handle/123456789/2005 Similiarity - The Comparative of α- and βCyclodextrin as Stabilizing Agents on AuNPs and Application as Colorimetric Sensors for Fe3+ in Tap Water Kuntolaksono, Satrio In this study, AuNPs were reduced using ortho-hydroxybenzoic acid (o-HBA) and various stabilizing agents (α-CDs and β-CDs). The stability, shape, size, and sensitivity of the Fe3+ detection of AuNPs α-CDs and AuNP β-CDs are compared. Both nanomaterials were characterized using ultraviolet-visible (UV-vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and transmission electron microscopes (TEM). After the addition of Fe3+, the absorption rate of surface plasma resonance (SPR) increased to 524 nm, and the color of AuNPs α-CDs and AuNPs β-CDs was changed from pink to red and purple, respectively. AuNPs α-CDs are more uniform in shape and size than AuNPs β-CDs with a size of 23.34 nm. Further, AuNPs α-CDs are more stable, and the absorption rate at 524 nm wavelength decreases by 17.76%. AuNPs α-CDs have a good linear relationship with a linear regression coefficient of 0.996. The sensitivity of AuNPs α-CDs was good with LoD and LoQ both with 1.21 and 4.02 ppm, respectively. These results show that the sensor is superior in determining Fe3+. In addition, AuNPs αCDs were used to detect Fe3+ in the tap water in South Tangerang, Banten, Indonesia. 2023-07-23T00:00:00Z http://repository.iti.ac.id/jspui/handle/123456789/1723 Similiarity - Magnetic properties of nanomagnetic material based on BaTiO3 and BiFeO3 with variation of temperatures and times of sintering Yatmani, Sri This research uses basic compound of BaTiO3 (BTO) and single phase multiferroic material BiFeO3 (BFO) with weight ratio of BTO: BFO = 2: 1 to produce multiferoic ceramic. The purpose of this research is to know magnetic properties of the ceramic which consists of BFO multiferroic material combined with BTO electrical material. Changes in magnetic properties will affect the quality of multiferroic materials. The process used sol-gel method using temperature and time of calcination of 350o C and 4 hours, then sintered at 700,750 and 800o C for 2, 4 and 6 hours respectively. The sample was characterized by XRD test with diffraction angle of 20o -100o and the machine was made in Phillips type of PW 1835. This test is to know types of phases. To know magnetic properties of sample, it was used Permagraph test. To know particle size, it was used Particle Size Measurement from Nano Instrument of Beckman Coulter DelsaTM. The results show that new phase is formed which is the dominant phase, Barium Bismuth Iron (III) Oxide (BaBiFe2O5) with the largest percentage (98,79%) obtained at sintering process with temperature of 750o C for 6 hours. Increasing the percentage of dominant phases is linier by increasing of magnetic properties of the sample. The highest value of magnetic properties among other coercivity of 247.1 kA / m, remanent of 0.275 Tesla and Saturation of 0.41 Tesla belongs to ceramic with condition of sintering temperature and time of 750o C and 6 hours . The smallest particle size is also obtained under the same conditions equal to the particle size of 54-57 nm. 2019-01-01T00:00:00Z http://repository.iti.ac.id/jspui/handle/123456789/1722 Similiarity - A CHEMICAL ROUTE TO THE SYNTHESIS OF Bi1-xMgxFeO3 (x=0.1 and x=0.07) NANOPARTICLE WITH ENHANCED ELECTRICAL PROPERTIES AS MULTIFERROIC MATERIAL Yatmani, Sri Bismuth ferrite (BiFeO3) is one of multiferroic material group, but it is difficult to produce BiFeO3 in single phase as multiferroic material because it occurs leakage of current arising from non stoichiometric. So, to minimize it, it has already been engineering processed to synthesis BiFeO3 doped by Mg to produce Bi0.9Mg0.1FeO3 and Bi0.93Mg0.07FeO3. It used sol-gel method to produce the ceramics. The result of TGA/DTA(Thermo Gravimetric Analysis/Differential Thermal Analysis) test shows that the temperature of calcination is about of 150 and 175oC and temperature of sintering is about of 650oC. Characterization of the powder has already been done by using X-Ray Diffraction (XRD) test and electrical properties test. The results of XRD test show that the powder of Bi0.9Mg0.1FeO3has minimum impurities with total oxide of 6.9% (bismite 3.5% and silenite 3.4%) at calcination temperature of 175oC for 4 hours and sintering at 650oC for 6 hours. Meanwhile at same parameter, Bi0.93Mg0.07FeO3 has more oxide phases with total oxide of 14.5% which consists of silenite (2.5%) and Bi2O4 (12%). Presence of oxide phases could cause leakage of current decreasing electrical properties. The values of electrical saturation polarization for ceramic having minimum total oxide (Bi0.9Mg0.1FeO3) is higher than ceramic having more oxide (Bi0.93Mg0.07FeO3). The value of electric saturation polarization for Bi0.9Mg0.1FeO3 is of 0.26 kv/cm and for Bi0.93Mg0.07FeO3 is of 0.11 kV/cm. 2018-01-01T00:00:00Z http://repository.iti.ac.id/jspui/handle/123456789/1721 Similiarity - Optimization of The Durian Peel Waste Adsorbent in The Purification of Used Cooking Oil Yatmani, Sri Durian peel waste (Durio zibethinus Murray) is not effectively exploited and even left to become rubbish, which pollutes the environment. The cellulose from durian peel can be used to generate absorbent activated carbon. This study improves the durian peel adsorbent for the purification of used cooking oil. Carbon activation expands the pores of activated carbon, increasing its surface area and adsorption capacities for purifying spent cooking oil. The best conditions for producing adsorbents from durian peel were identified by adjusting the carbonization period between 300, 400, and 500 °C, activating the 1.25 m mesh size with HCl and KOH activators at concentrations of 3 M and 4 M, and soaking the material for 24 hours. Using 4 M HCl activator, 24 hours at 400 °C, and SNI 06-3730- 1995 criteria, the ideal conditions for activating durian peel activated carbon in the purification of wasted cooking oil were achieved. SEM at 1000-fold magnification (1.357 m) confirmed an even surface and successful absorption. Durian peel adsorption in the purification of wasted cooking oil reduced peroxides (30.26%), free fatty acids (57.14%), and water content (45%), clarifying the color of leftover cooking oil. 2022-01-01T00:00:00Z