Rosy Eko Saputro

State University of Malang | UM · Department of Physics

The Cr x Fe[Formula: see text]O 4 ferrofluids have been successfully synthesized using natural iron sand through co-precipitation method as a voltage sensor. The use of chromium dopants is intended to increase the ferrofluids response when used as a voltage sensor. A series of characterizations were carried out to support this justification, includ...

This study performs natural sand-based synthesis using the sonochemical route for preparing Zn-doped magnetite nanoparticles. The nanoparticles were dispersed in water as a carrier liquid to form Zn-doped magnetite aqueous ferrofluids. Structural data analysis indicated that the Zn-doped magnetite nanoparticles formed a nanosized spinel structure....

New Fe3O4/polyvinyl alcohol (PVA)/sodium alginate (C6H7O6Na)n nanohybrid ferrogels for antibacterial applications were fabricated. The crystal and molecular structures along with optical and magnetic properties of the prepared samples were characterized. The antibacterial activity of the ferrogels against Bacillus subtilis and Escherichia coli was...

To date, the search for creating stable ferrofluids with excellent properties for biomedical application is one of the challenging scientific and practical investigations. In this study, novel Fe3O4/Ag nanohybrid ferrofluids from iron sand were synthesized using a double-layer method. The Fe3O4/Ag nanocomposites exhibited stable crystallite sizes o...

This study investigated the effects of annealing temperature on the structure evolution and antifungal performance of TiO 2 /Fe 3 O 4 nanocomposites. The TiO 2 /Fe 3 O 4 nanocomposites were fabricated through a combination of sonochemical and coprecipitation routes. The TiO 2 structure evolved from an amorphous phase to a crystalline anatase phase...

This research explored the magnetic properties and the antimicrobial activities of Co0.4Fe2.6O4 ferrofluids dispersed in olive oil. The Co0.4Fe2.6O4 nanoparticles were synthesized through the coprecipitation method, and their structure and morphology were characterized as a preliminary study. The Co0.4Fe2.6O4 nanoparticles possessed a lattice param...

The preparation of Co-doped magnetite ferrofluids from natural sand was developed using a double-layer technique. The Co-doped magnetite nanoparticles formed a spinel phase with lattice parameters in the range of 8.355–8.422 Å and tended to agglomerate with the particle sizes of 7–12 nm. The presence of the first and second layers from oleic acid a...

In this work, the synthesis of magnetite/PEG nanoparticles combined with curcumin was conducted by using a simple coprecipitation method. The samples obtained were characterized using XRD, FTIR, and VSM for their structural and magnetic properties. Meanwhile, investigation of the potential as drug delivery agents was done through the drug release t...

Mn1-x Zn x Fe2O4 ferrofluids were produced from natural sand for magnetic sensors and radar absorbing materials. The X-ray diffraction data showed that the Zn partially substituted the Mn and Fe ions to construct a spinel structure. The increasing Zn composition decreased the lattice parameters of the structure. The transmission electron microscop...

In this work, the synthesis of iron chromite nanoparticles was performed employing Indonesian iron sand through the coprecipitation route. The crystal and molecular structures of the prepared iron chromite nanoparticles were characterized by means of XRD and FTIR spectrophotometer. Meanwhile, the elemental mapping and morphology of the samples were...

Fe 3 O 4 nanoparticles were synthesized through a sonochemical method and were subsequently investigated by X-ray diffraction (XRD), which showed that the phase obtained was Fe 3 O 4 with the most intense peak at 2[Formula: see text] of 35.5 ∘ . The particle size of the Fe 3 O 4 nanoparticles was 11.4[Formula: see text]nm. The dried ferrofluids con...

This study was conducted to identify the characteristics of α-Fe2O3/TiO2 nanohybrid particles as antifungal agents. The nanohybrid synthesis was carried out by using the local iron sand-based coprecipitation method. Some characterization was carried out to determine the structure, morphology, and functional groups of materials as a preliminary stud...

This work was conducted to investigate the effects of the polyethylene oxide (PEO) as a template on the structures, functional groups, magnetic properties, and antibacterial activities of Fe3O4/PEO/TMAH ferrofluids. Synthesis of Fe3O4 nanoparticles was carried out by using the co-precipitation method obtained from iron sand. The ferrofluid synthesi...

Zinc oxide has always been one of the most important materials for advanced applications, even with different shapes and sizes. In this present study, we report the crystal formation, morphological behavior, and functional group characteristics of zinc oxide materials. A sol-gel technique at ambient condition was chosen to fabricate the zinc oxide...

This study aimed to investigate the structural, magnetic, and antibacterial activities of CrxFe3−xO4 ferrofluids. CrxFe3−xO4 nanoparticles were synthesized from iron sand by a co-precipitation method using Cr³⁺ ion variants (x content) of 0, 0.05, 0.1, 0.15, and 0.2. The prepared nanoparticles were then characterized by X-ray diffraction (XRD), tra...

Nowadays, the application of nano-sized anatase titanium dioxide particles becomes one of the essential research focuses by many experts, especially for biomedical applications. In this work, we report the utilization of coprecipitation route in preparing nano-sized anatase titanium dioxide as an antifungal agent. The data analysis for the XRD data...

This research aimed at investigating Fe 2 MO 4 ferrofluids nanostructure, with M was Fe, Ti and Cr. Fe 2 MO 4 nanoparticles were synthesized through coprecipitation method, and the phase and crystallinity were analyzed using XRD instrument. The obtained results showed the Fe 3 O 4 phase, but there was a shift in diffraction peak position contribute...

This work was aimed to identify the functional group and magnetic properties of the Fe3O4 ferrofluids coated by oleic acid regarding different compositions of olive oil as a dispersing agent. The results of the x-ray diffraction (XRD) data presented that the phase of the samples was a Fe3O4 phase, which was identified based on the diffraction peaks...

In this work, the iron sand taken from Wedi Ireng Beach in Banyuwangi, Indonesia, was employed as the main precursor in fabricating magnetite nanoparticles. The magnetite nanoparticles were then functionalized in preparing magnetic fluids coated by oleic acid as a surfactant and dispersed in olive oil as a liquid carrier. The phase purity, crystall...