scholarly journals Temperature-induced switchable magnetite nanoparticle superstructures

2020 ◽  
Vol 1 (1) ◽  
pp. 10-13
Author(s):  
Cathrin Kronenbitter ◽  
Hironobu Watanabe ◽  
Sadahito Aoshima ◽  
Helmut Cölfen

In this study we describe the green synthesis of temperature-switchable polymer-magnetite nanoparticles (PMNPs) in water at room temperature via an improved co-precipitation pathway for reversible switchable superstructures.

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Sri Nengsih

Research on the sand iron potential in generating magnetite nanoparticles in Lampanah Aceh Besar through a study of techniques processing, synthesis methods and structural characteristics has been completed. The method used in this research is qualitative method in the kind of literature study from the data of Banda Aceh ESDM Ministry. The results of this study indicate that iron sand in Lampanah area has a dominant element which contained Fe3O4. The magnetic separation method is used to separate the iron sand from impurities, while the co-precipitation synthesis of one of the methods chosen in generating the magnetite nanoparticles which due to a simple, economical experimental process and low treatment temperature. Through the XRD test, the cubic iron sand magnetite nanoparticles with a 2 angle are 35,55o, 57,13o and 62,70o with the hkl [311], [511] and [440], while the TEM and SEM tests showed that the dominant particle shape is round and the distribution is tight. Therefore, controlling the size and shape of iron sand magnetite nanoparticles will provide great potential in the magnetic field of magnetism. The conclusions of this study show that the iron sand located in Aceh Besar has the potential to be a magnetite nanoparticle.


2011 ◽  
Vol 324 ◽  
pp. 129-132 ◽  
Author(s):  
Wegdan Ramadan ◽  
Marwa Kareem ◽  
Béatrice Hannoyer ◽  
Shanta Saha

Magnetite, Fe3O4, nanoparticles were synthesized using co-precipitation aqueous method at room temperature and at different pH, from 8 to 12.5. The pH value was found to influence greatly the resulting phases and has no significant effect on the particle size. In all cases, magnetite was found to be the main phase but the contribution of Goethite phase was identified clearly with the increase in pH. Significant reduction in saturation magnetization was evident. Structural and magnetic properties of the nanoparticles were examined using; XRD, TEM, Raman Spectroscopy and SQUID.


RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14624-14631
Author(s):  
Pablo Eduardo Cardoso-Avila ◽  
Rita Patakfalvi ◽  
Carlos Rodríguez-Pedroza ◽  
Xochitl Aparicio-Fernández ◽  
Sofía Loza-Cornejo ◽  
...  

Gold and silver nanoparticles were synthesized at room temperature using an aqueous extract from dried rosehips acting as reducing and capping agents with no other chemicals involved.


2014 ◽  
Vol 40 (1) ◽  
pp. 1519-1524 ◽  
Author(s):  
Lazhen Shen ◽  
Yongsheng Qiao ◽  
Yong Guo ◽  
Shuangming Meng ◽  
Guochen Yang ◽  
...  

2017 ◽  
Vol 6 (5) ◽  
Author(s):  
Zahra Abbasi ◽  
Sholeh Feizi ◽  
Elham Taghipour ◽  
Parinaz Ghadam

AbstractSilver nanoparticles (AgNPs) have widespread applications. Recently, the synthesis of NPs using plant extract has attracted much attention. In this study, with an easy and rapid process at room temperature, AgNPs were produced by the aqueous extract of dried


2010 ◽  
Vol 40 (8) ◽  
pp. 1216-1223 ◽  
Author(s):  
Yahya S. Beheshtiha ◽  
Majid M. Heravi ◽  
Mina Saeedi ◽  
Narges Karimi ◽  
Masumeh Zakeri ◽  
...  

2012 ◽  
Vol 531 ◽  
pp. 219-222
Author(s):  
Li Hua Shen ◽  
Ting Shang ◽  
Jun Zhou ◽  
Dong Wang ◽  
Yu Han ◽  
...  

Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.


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