In this work, a simple one-step hydrothermal method was developed to synthesize high-quality α-FeO nanoparticles with a snowflake-like microstructure. First, a series of binary supramolecular aggregates were prepared by a non-covalent combination between a polymer such as polyvinylpyrrolidone (PVP) and a complex such as potassium ferrocyanide (PF). Then, the aggregates were used as the precursors of the one-step hydrothermal reactions. The snowflake-like nanostructure has six-fold symmetry as a whole, and each petal is symmetric. This synthesis method has the characteristics of simplicity, rapidity, reliance, and high yield, and can be used for creating high-quality α-FeO nanoparticles. Moreover, our results show that the molar ratio of PVP to PF, reaction time and temperature play important roles in the generation of a complete snowflake structure from different angles. Also, the snowflake-like α-FeO nanostructure exhibits a much higher coercivity (2997 Oe) compared to those reported by others, suggesting a strong hysteresis behaviour, which promises potential applications in memory devices, and other fields. Further, the α-FeO nanosnowflakes show a much higher photocatalytic degradation activity for cationic organic dyes such as crystal violet, rhodamine 6G than for anionic dyes such as methyl orange. A possible photocatalytic mechanism was proposed for explaining the selectivity of the photocatalytic oxidation reaction of organic dyes. We believe that this study provides a direct link among coordination compounds of transition metals, their supramolecular aggregates with polymers, and controlled hydrothermal synthesis of high-quality inorganic metal oxide nanomaterials.
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http://dx.doi.org/10.1039/c9ra07490b | DOI Listing |
Microsc Res Tech
September 2023
Faculty of Veterinary Medicine, University of Forestry, Sofia, Bulgaria.
The design, engineering and electron microscopic characterization of anisotropic nanosized snowflake-like structural assemblies (nanosnowflakes) is reported. They were fabricated through immobilization of double stranded amine-modified and thiol-terminated DNA oligonucleotides on the surface of ultra-small isotropic gold nanoparticles used as nanocarriers. The transmission electron microscopy images combined with spectrophotometric data revealed the formation of self-assembled structural aggregation between individual ligands-coated nanoparticles.
View Article and Find Full Text PDFInt J Nanomedicine
October 2022
School of Medical Imaging, Binzhou Medical University, Yantai, Shandong, 264003, People's Republic of China.
Introduction: Accurate tumor diagnosis is essential to achieve the ideal therapeutic effect. However, it is difficult to accurately diagnose cancer using a single imaging method because of the technical limitations. Multimodal imaging plays an increasingly important role in tumor treatment.
View Article and Find Full Text PDFMater Today Bio
March 2022
Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu, 42994, Republic of Korea.
Redox activity is known to regulate migration, invasion, metastasis, proliferation, and vascularization of cancer. Because cancer is heterogeneous, the role of redox activity in different cancers and cancer-related processes vary widely. In this study, water soluble, Tween 80-coated polyaniline (TPAni) nanoparticles were synthesized and used as nano-agents for sensing the redox activities of various cancer cells.
View Article and Find Full Text PDFAnal Chem
November 2021
Department of Medical Device, Korea Institute of Machinery and Materials (KIMM), Daegu 42994, Republic of Korea.
The conventional tissue biopsy method yields isolated snapshots of a narrow region. Therefore, it cannot facilitate comprehensive disease characterization and monitoring. Recently, the detection of tumor-derived components in body fluids─a practice known as liquid biopsy─has attracted increased attention from the biochemical research and clinical application viewpoints.
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