skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Characterization of mechano-thermally synthesized Curie temperature-adjusted La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles coated with (3-aminopropyl) triethoxysilane

Abstract

This research aimed to synthesize nanostructured strontium-doped lanthanum manganite, La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LSMO), with its Curie temperature (T{sub c}) adjusted to the therapeutic range, through a mechanothermal route. In order to investigate the effect of heat treatment temperature and duration on the resulting crystallite size, morphology, magnetic behavior and Curie temperature, the starting powder mixture was milled in a planetary ball mill before being subsequently heat treated at distinct temperatures for different time lengths. The composition, morphology, and magnetic behavior were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and vibrating sample magnetometer (VSM). In addition, magnetic properties were further investigated using an alternating current (AC) susceptometer and thermo-magnetic analyzer. 20 h of milling produced a crystallite size reduction leading to a decrease in the heat treatment temperature of LSMO synthesis to 800 °C. Moreover, SEM analysis has shown the morphology of a strong agglomeration of fine nanoparticles. HRTEM showed clear lattice fringes of high crystallinity. The mean crystallite and particle size of 20-hour milled sample heat treated at 1100 °C for 10 h are relatively 69 and 100 nm, respectively. The VSMmore » data at room temperature, indicated a paramagnetic behavior for samples heat treated at 800 °C. However, by increasing heat treatment temperature to 1100 °C, LSMO indicates a ferromagnetic behavior with well-adjusted Curie temperature of 320 K, suitable for hyperthermia applications. Also, reentrant spin glass (RSG) behavior has been found in heat treated samples. The particles are coated with (3-aminopropyl) triethoxysilane (APTES) for biocompatibility purposes; Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis (TGA) are used for further confirmation of APTES coating. - Highlights: • La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles were synthesized via a mechanothermal route. • We report a significant reduction in the heat treatment temperature. • The Curie temperature was tuned within the therapeutic range. • The particles were coated with (3-aminopropyl) triethoxysilane for biocompatibility purposes.« less

Authors:
 [1];  [2];  [2]
  1. Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242 (United States)
  2. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22476124
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 106; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CURIE POINT; DOPED MATERIALS; ELECTRON DIFFRACTION; FOURIER TRANSFORM SPECTROMETERS; HEAT TREATMENTS; INFRARED SPECTRA; LANTHANUM COMPOUNDS; MAGNETIC ANALYZERS; MAGNETIC PROPERTIES; MANGANATES; NANOPARTICLES; NANOSTRUCTURES; PARAMAGNETISM; SCANNING ELECTRON MICROSCOPY; SPIN GLASS STATE; STRONTIUM COMPOUNDS; THERMAL GRAVIMETRIC ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION

Citation Formats

Salili, S. M., School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Ataie, A., E-mail: aataie@ut.ac.ir, Barati, M. R., Department of Materials Engineering, Monash University, Clayton, Victoria 3800, and Sadighi, Z. Characterization of mechano-thermally synthesized Curie temperature-adjusted La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles coated with (3-aminopropyl) triethoxysilane. United States: N. p., 2015. Web. doi:10.1016/J.MATCHAR.2015.05.025.
Salili, S. M., School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Ataie, A., E-mail: aataie@ut.ac.ir, Barati, M. R., Department of Materials Engineering, Monash University, Clayton, Victoria 3800, & Sadighi, Z. Characterization of mechano-thermally synthesized Curie temperature-adjusted La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles coated with (3-aminopropyl) triethoxysilane. United States. https://doi.org/10.1016/J.MATCHAR.2015.05.025
Salili, S. M., School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Ataie, A., E-mail: aataie@ut.ac.ir, Barati, M. R., Department of Materials Engineering, Monash University, Clayton, Victoria 3800, and Sadighi, Z. 2015. "Characterization of mechano-thermally synthesized Curie temperature-adjusted La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles coated with (3-aminopropyl) triethoxysilane". United States. https://doi.org/10.1016/J.MATCHAR.2015.05.025.
@article{osti_22476124,
title = {Characterization of mechano-thermally synthesized Curie temperature-adjusted La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles coated with (3-aminopropyl) triethoxysilane},
author = {Salili, S. M. and School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran and Ataie, A., E-mail: aataie@ut.ac.ir and Barati, M. R. and Department of Materials Engineering, Monash University, Clayton, Victoria 3800 and Sadighi, Z.},
abstractNote = {This research aimed to synthesize nanostructured strontium-doped lanthanum manganite, La{sub 0.8}Sr{sub 0.2}MnO{sub 3} (LSMO), with its Curie temperature (T{sub c}) adjusted to the therapeutic range, through a mechanothermal route. In order to investigate the effect of heat treatment temperature and duration on the resulting crystallite size, morphology, magnetic behavior and Curie temperature, the starting powder mixture was milled in a planetary ball mill before being subsequently heat treated at distinct temperatures for different time lengths. The composition, morphology, and magnetic behavior were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and vibrating sample magnetometer (VSM). In addition, magnetic properties were further investigated using an alternating current (AC) susceptometer and thermo-magnetic analyzer. 20 h of milling produced a crystallite size reduction leading to a decrease in the heat treatment temperature of LSMO synthesis to 800 °C. Moreover, SEM analysis has shown the morphology of a strong agglomeration of fine nanoparticles. HRTEM showed clear lattice fringes of high crystallinity. The mean crystallite and particle size of 20-hour milled sample heat treated at 1100 °C for 10 h are relatively 69 and 100 nm, respectively. The VSM data at room temperature, indicated a paramagnetic behavior for samples heat treated at 800 °C. However, by increasing heat treatment temperature to 1100 °C, LSMO indicates a ferromagnetic behavior with well-adjusted Curie temperature of 320 K, suitable for hyperthermia applications. Also, reentrant spin glass (RSG) behavior has been found in heat treated samples. The particles are coated with (3-aminopropyl) triethoxysilane (APTES) for biocompatibility purposes; Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetric analysis (TGA) are used for further confirmation of APTES coating. - Highlights: • La{sub 0.8}Sr{sub 0.2}MnO{sub 3} nanoparticles were synthesized via a mechanothermal route. • We report a significant reduction in the heat treatment temperature. • The Curie temperature was tuned within the therapeutic range. • The particles were coated with (3-aminopropyl) triethoxysilane for biocompatibility purposes.},
doi = {10.1016/J.MATCHAR.2015.05.025},
url = {https://www.osti.gov/biblio/22476124}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 106,
place = {United States},
year = {Sat Aug 15 00:00:00 EDT 2015},
month = {Sat Aug 15 00:00:00 EDT 2015}
}