Atom transfer radical polymerized MR fluids

Hu, Ben; Fuchs, Alan; Huseyin, S.; Gordaninejad, Faramarz; Evrensel, Cahit A.

doi:10.1016/j.polymer.2006.08.069

Cited by 45 publications

(63 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In intermediate fields, the contact or polar region of each particle saturates, thus reducing the rate of increase of the shear stress with increasing field. At high fields, the shear stress reaches a limiting value due to completely saturated particles [16]. In addition, the shear stress is independent of shear rate until critical shear rate, because the particle chains which are formed by an external magnetic field are maintained by repeated creation and destruction of the particle chain until the critical shear rate reaches.…”

Section: Rheological Properties Of Mr Fluidsmentioning

confidence: 99%

Preparation and characterization of MR fluid consisting of magnetite particle coated with PMMA

Hong¹,

Park²,

Choi³

2009

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Section: Rheological Properties Of Mr Fluidsmentioning

confidence: 99%

Preparation and characterization of MR fluid consisting of magnetite particle coated with PMMA

Hong¹,

Park²,

Choi³

2009

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

“…Wang 10 observed that MgFe 2 O 4 nanocrystal clusters were regarded as promising candidates for MRF with an enhanced sedimentation stability. Certain scholars were used to modify the particle surface, [11][12][13][14][15][16] select a di®erent carrier, 3,17,18 add di®erent surfactants [19][20][21][22][23] and many other methods to improve the MRF properties. In the aforementioned studies, the settling stability of MRFs to various degrees was optimized, whereas in certain cases, at the expense of reducing the shear yield strength, increasing the¯eld viscosity or increasing the preparation duration and cost.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nano-Diamond on Magnetorheological Fluid Properties

Zhao

Zhang

Yao

et al. 2017

NANO

View full text Add to dashboard Cite

In order to analyze the e®ects of nano-diamond on the performance of magnetorheological°uids (MRFs), in this paper, the MRF-1 with a 2% mass fraction in nano-diamond and the MRF-2 without nano-diamond were prepared by the carbonyl iron powder as the dispersed phase and the synthetic mineral oil as the continuous phase. The viscosity and shear stress of MRFs under di®erent magnetic¯elds were measured by the Anton-Paar rheometer (MCR 302). The MRF settling stability was studied by a standing observation method. A four-ball wear machine was utilized for the wear test at 0.1 T of magnetic¯eld, whereas the magnetic¯eld was provided by an external coil. Also, the three-dimensional white light interferometer was utilized to observe the surface of the ball wear spot, in order to determine the MRF friction properties. The results demonstrated that the nano-diamond had a signi¯cant increase in the surface wear. The shear yield strength and settling stability of the MRF could be highly enhanced. The higher the strength of the magnetic¯eld was, the higher the di®erence in the shear yield strength was. These phenomena demonstrated that the physical properties of the nano-diamond could have a higher impact on MRF, which was of high signi¯cance to the preparation of MRFs with excellent performance.

show abstract

“…Control over the polymer molecular weight and its distribution during polymerization has long been a challenge in polymer material research, especially in the applications for medicine release material and as biotechnology materials [3,4]. The advent of atom transfer radical polymerization (ATRP) provides a new way to synthesize polymers with controlled molecular weight [5][6][7]. Numerous well-defined (co)polymers with the desired molecular weight and low polydispersity index (PDI <1.5) [8,9], (co)polymers with complex architectures [10][11][12][13], functional polymers and hybrid materials have been prepared by the ATRP technique [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of different ligands on the controlled polymerization of monodisperse polystyrene nanospheres by atom transfer radical polymerization in an aqueous emulsion

Tian¹,

Hu²,

Miao³

et al. 2012

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Polystyrene nanospheres have been synthesized by atom transfer radical polymerization (ATRP) to control the molecular weight distribution in the aqueous system. The crucial factor in such a system is the ligand that adjusts the solubility of the catalyst in different phases to control the concentration of both the activator and the deactivator in reaction phase. The effect of different ligands including ethylenediamine, 1,10-phenanthroline (phen) and 4,4-dinonyl-2, 2-bipyridyl (dNbpy) on the catalytic solubility in the organic and aqueous phase has been investigated. The molecular weight distribution of polymer obtained in this way was analyzed by gel permeation chromatography (GPC). It showed that the obtained polymer particles presented a broad molecular weight distribution (polydispersity index 1.78) with ethylenediamine as the ligand, but the polymerization rate was high and conversion reached 96.8%. The molecular weight distribution of polystyrene was narrowest with dNbpy as ligand, but the conversion was lowest and only achieved to 69%. Possible reasons were the influence of the structure of three different ligands on the control of ATRP reaction. SEM and GPC indicated that the polystyrene nanospheres presented regular sphere with a diameter of about 120 nm and uniform molecular weight distribution, which possessed a significant potentials in drug carrier field.

show abstract

Atom transfer radical polymerized MR fluids

Cited by 45 publications

References 26 publications

Preparation and characterization of MR fluid consisting of magnetite particle coated with PMMA

Preparation and characterization of MR fluid consisting of magnetite particle coated with PMMA

Effects of Nano-Diamond on Magnetorheological Fluid Properties

Effect of different ligands on the controlled polymerization of monodisperse polystyrene nanospheres by atom transfer radical polymerization in an aqueous emulsion

Contact Info

Product

Resources

About