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- TL;DR Summary
- Looking for resources to help model the effective spring constant of chain molecules sorbed onto the surface of magnetic nanoparticles
Hi All,
I'm doing research in magnetic nanoparticles that are coated with chain molecules (oleic acid, I believe) and I am trying to model these molecules' effective spring constant.
The basic scenario is this: When a water-based ferrofluid is evaporated, it leaves behind only dried particles that are clumped together. These particles have chain molecules sorbed onto their surface to prevent agglomeration and oxidization while in the carrier fluid. The protective molecules are about 1nm long. One they are dried, if they are subjected to a magnetic field they will try to rotate to align in the field. To know how they will do this a priori, I'd like to model them as simple springs. I have looked in several places online but I can't find where this property is discussed (or at least it's not called a spring constant). With this info I could perhaps make a more sophisticated model later.
Some extra details for anyone interested: The particles are 10nm Fe3O4 and have an internal anisotropy around 25-30kA/m based on fitted data and a theoretical calculation for cubic anisotropy. I know the magnetization will align in the field independent of the particle crystal, but it won't be without some strain on the bonds that connect each particle due to the non-zero anisotropy.
Any help is appreciated. I have access to the Web of Knowledge through the graduate school so even a DOI or paper title will suffice.
Thanks
I'm doing research in magnetic nanoparticles that are coated with chain molecules (oleic acid, I believe) and I am trying to model these molecules' effective spring constant.
The basic scenario is this: When a water-based ferrofluid is evaporated, it leaves behind only dried particles that are clumped together. These particles have chain molecules sorbed onto their surface to prevent agglomeration and oxidization while in the carrier fluid. The protective molecules are about 1nm long. One they are dried, if they are subjected to a magnetic field they will try to rotate to align in the field. To know how they will do this a priori, I'd like to model them as simple springs. I have looked in several places online but I can't find where this property is discussed (or at least it's not called a spring constant). With this info I could perhaps make a more sophisticated model later.
Some extra details for anyone interested: The particles are 10nm Fe3O4 and have an internal anisotropy around 25-30kA/m based on fitted data and a theoretical calculation for cubic anisotropy. I know the magnetization will align in the field independent of the particle crystal, but it won't be without some strain on the bonds that connect each particle due to the non-zero anisotropy.
Any help is appreciated. I have access to the Web of Knowledge through the graduate school so even a DOI or paper title will suffice.
Thanks