Enhanced viscoelastic property of iron oxide nanoparticle decorated organoclay fluid under magnetic field

Abstract

Stable hydrophobic nanocomposites of magnetic nanoparticles and clay are prepared by the self-assembly of magnetite (Fe3O4) nanoparticles on surfaces of exfoliated clay platelets. Due to the attractive interaction between hydrophobic groups, oleic acid coated nanoparticles are strongly attached to the surface of cetyl trimethylammonium cation coated clay platelets in organic media. Crystal structure and magnetic property of composite particles are examined using electron microscopy, x-ray diffractometer and vibration sample magnetometer. In addition, composite particles are dispersed in mineral oil and rheological properties of composite particle suspensions are characterized using steady-state and oscillatory measurements. Magnetite nanoparticle decorated organoclay forms a tunable network in mineral oil. When a magnetic field is applied, the composite particle fluid exhibits higher storage modulus and maintains a solid-like property at larger strain. Our results show that the viscoelastic property of the magnetite nanoparticle decorated organoclay fluid is controlled by applying external magnetic field.

Effect of Zn nonmagnetic element doping and a polyvinyl pyrrolidone shell layer on the superparamagnetism and stability properties of magnetic nanoparticles

“…27) These findings can be extended to samples with 0 < x < 0.25 and an appropriate mass ratio of Fe 1−x Zn x Fe 2 O 4 /PVP suitable for current trends in biomedical application research involving the coating of magnetic nanoparticles with organic materials. 11,26,38,43,46) In addition, Fe 3 O 4 nanoparticles with sizes of 8-20 nm have been dispersed into oleic acid (C 18 H 34 O 2 ) or other insulating vegetable oils to create magnetic fluids 47,48) with important applications in mechanical engineering, aerospace, national defense and other fields. In particular, these magnetic fluids have a high potential for treating cancer because of their magnetic fluid hyperthermia effect.…”

Dual Stimuli-Triggered Nanogels in Response to Temperature and pH Changes for Controlled Drug Release

“…Stimuli-responsive nanocarriers have generally been developed as drug delivery systems for therapy, imaging, and diagnostics [1, 2]. Recently, various stimuli including pH, temperature, biomolecules, redox, magnetic field, and ultraviolet light have been used to induce sustained or controlled drug release via an internal or external activation [3–6]. Among these stimuli, pH and temperature are the most well-known modalities in drug delivery and release systems.…”

Heterogeneous Microfluidic Reactors: A Review and an Insight of Enzymatic Reactions

“…The conventional methods of synthesizing magnetic nanoparticles are co-precipitation [99][100][101][102], thermal decomposition [103], flame spray [104], and hydrothermal synthesis [105,106]. These methods show some drawbacks, such as the instability of the produced nanoparticles [107], complicated production process, high pressure and temperature, and toxic and expensive reagents [108,109].…”