A Novel Method for Magnetic Isolation and Characterization of Polycarbonate-Urethane Wear Particles

2010 ◽  
Author(s):  
Jonathan J. Elsner ◽  
Keren Hakshur ◽  
Avi Shterling ◽  
Eran Linder-Ganz ◽  
Noam Eliaz
Keyword(s):  
Large Range ◽  
Magnetic Moments ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Particle Sizes ◽  
Wear Particles ◽  
Isolation And Characterization ◽  
Ultrahigh Molecular Weight ◽  
Erbium Chloride ◽  
Novel Method

Ferrography is a method for separating wear particles onto a slide. The method is based on the interaction between an external magnetic field and the magnetic moments of the particles suspended in a flow stream. It is advantageous in providing high detectability rate for a relatively large range of particle sizes (0.5–200 μm) [1]. A newer generation of ferrography, known as Bio-Ferrography, allows particles from five fluid samples to be isolated simultaneously on one slide and analyzed in terms of their number, chemistry, shape, dimensions, surface morphology, structure, etc. Since magnetization does not naturally occur in polymeric and biological materials, wear particles of such origins must be magnetized prior to Bio-Ferrography. This can be done, for instance, by binding to a ferromagnetic element, such as Er+3, originating from erbium chloride (ErCl3) solution. Such Bio-Ferrography technology has already been applied successfully in hip wear simulations for the separation of ultrahigh molecular weight polyethylene (UHWPE) wear debris suspended in bovine serum as lubricant [2].

Structural characterization of ultrahigh-molecular-weight polyethylene reactor powders based on fuming nitric acid etching

Polymer ◽  
1998 ◽  
Vol 39 (24) ◽  
pp. 6127-6135 ◽  
Author(s):  
Hiroki Uehara ◽  
Mitsuhiro Nakae ◽  
Tetsuo Kanamoto ◽  
Osamu Ohtsu ◽  
Akira Sano ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Nitric Acid ◽  
Structural Characterization ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Acid Etching ◽  
Ultrahigh Molecular Weight ◽  
Fuming Nitric Acid

High efficiency fabrication of ultrahigh molecular weight polyethylene submicron filaments/sheets by flash-spinning

2016 ◽  
Vol 36 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Lei Xia ◽  
Peng Xi ◽  
Bo-wen Cheng
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
High Efficiency ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Potential Method ◽  
Forming Process ◽  
Commercial Products ◽  
Ultrahigh Molecular Weight ◽  
Novel Method ◽  
Spinning Speed

Abstract In this study, we propose a novel method for preparing continuous ultrahigh molecular weight polyethylene (UHMWPE) filaments by flash-spinning. The filaments were processed by calendaring to obtain the sheets. The morphology of the filaments and the sheets, the forming process, the optimal fabrication conditions, mechanical properties, spinning speed, and the rate of spinning of the filaments were investigated. The results showed that the filaments were composed of bunches of microfibers and the diameter of the filaments and the microfibers ranged from 0.15 mm to 0.22 mm and 0.2 μm to 5 μm, respectively. For a given concentration of 5 wt% of the UHMWPE, optimal specimens were obtained only when the temperature was in the range 150–210°C and the pressure was in the range 8–20 MPa. The spinning speed and the polymer consumption increased with enhancement in the pressure and the value reached as high as 47.2 m/s and 116.7 g/min, respectively. The properties and the spinning efficiency of the filaments revealed that flash-spinning is a potential method for manufacturing commercial products in various fields of application.

scholarly journals Isolation and characterization of human primary enterocytes from small intestine using a novel method

2012 ◽  
Vol 47 (11) ◽  
pp. 1334-1343 ◽  
Author(s):  
Priti Chougule ◽  
Gustaf Herlenius ◽  
Nidia Maritza Hernandez ◽  
Pradeep B Patil ◽  
Bo Xu ◽  
...  
Keyword(s):  
Small Intestine ◽  
Isolation And Characterization ◽  
Novel Method

Preparation and Characterization of MWCNT/Ultrahigh-Molecular-Weight Polyethylene Composite Fiber

2012 ◽  
Vol 627 ◽  
pp. 761-764
Author(s):  
Tao Zhang ◽  
Tian Ma ◽  
Jian Chun Zhang ◽  
Peng Gang Gao ◽  
Hua Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Precursor Solution ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Composite Fiber ◽  
Gel Spinning ◽  
Polyethylene Composite ◽  
Ultrahigh Molecular Weight ◽  
Aggregation Structure ◽  
Uhmwpe Fibers

MWCNT/Ultrahigh-molecular-weight polyethylene (MWCNT/UHMWPE) composite was prepared by adding purified MWCNTs into the precursor solution of UHMWPE. Based on that, MWCNT/UHMWPE fibers were obtained using a gel spinning-molding technique. The thermal, mechanical and aggregation structure of MWCNT/UHMWPE fibers were characterized by TGA, mechanical property measurement and XRD, respectively. The results indicated the incorporation of MWCNTs into UHMWPE macromolecular chains have not change the aggregation structure of UHMWPE significantly, and the as-prepared MWCNT/UHMWPE fibers have evidently improved thermal stability and mechanical strength compared with the pristine UHMWPE fibers.

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