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Colloidal graphene oxide/polyaniline nanocomposite and its electrorheology
Zhang, Wen Ling,Park, Bong Jun,Choi, Hyoung Jin Royal Society of Chemistry 2010 Chemical communications Vol.46 No.30
<P>A nanocomposite of colloidal graphene oxide (CGO) and polyaniline (PANI) was fabricated <I>via in situ</I> oxidation polymerization in the presence of CGO prepared <I>via</I> a modified Hummers method without a dopant, in which the graphene oxide was individually exfoliated. Its electrorheological properties and other physical characteristics were studied.</P> <P>Graphic Abstract</P><P>A nanocomposite of colloidal graphene oxide (CGO) and polyaniline (PANI) was fabricated <I>via in situ</I> oxidation polymerization in the presence of CGO prepared <I>via</I> a modified Hummers method without a dopant, in which the graphene oxide was individually exfoliated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc00557f'> </P>
Ink-jetting and rheological behavior of a silica particle suspension
Wen Ling Zhang,최형진,고현석,권계시 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
To understand the particle-suspended inkjet behavior better, silica particle solutions with differentparticle sizes were dispersed in ethylene glycol. The effects of the particle size on the jetting behaviorwas examined using a laboratory-developed drop watcher system in addition to their rheologicalproperties determined using a rotational rheometer. The drying characteristics of the silica solutionswith different particle sizes on a glass substrate were also investigated. The results revealed a similar sizeof deposition droplets after the evaporation of droplets at 5 wt%, whereas a smaller deposition size wasobserved at 1 wt%.
Field-responsive smart composite particle suspension: materials and rheology
Wen Ling Zhang,Ying Dan Liu,최형진 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.3
Both electrorheological (ER) and magnetorheological (MR) fluids are known to be smart materials which can be rapidly and reversibly transformed from a fluid-like to a solid-like state within milliseconds by show\-ing dramatic and tunable changes in their rheological properties under external electrical or magnetic field strength, respectively. Here, among various smart composite particles studied, recently developed core-shell structured polystyrene/graphene oxide composite based ER material as well as the dual-step functionally coated carbonyl iron composite based MR material are briefly reviewed along with their rheological char\-acteristics under external fields.
Effect of Graphene Oxide on Carbonyl-Iron-Based Magnetorheological Fluid
Wen Ling Zhang,Sang Deuk Kim,Hyoung Jin Choi IEEE 2014 IEEE transactions on magnetics Vol.50 No.1
<P>Soft magnetic carbonyl iron (CI) particle-based magnetorheological (MR) fluids have been broadly used in mechanical systems due to their outstanding magnetic merits. However, serious sedimentation and agglomeration problems have been regarded as critical drawbacks during preparing and testing the CI-based MR fluids. In this study, we adopted plate-like particles of graphene oxide (GO) as a gap-filler for the CI-based MR fluid to improve its sedimentation problem. MR properties were evaluated using a rotational rheometer, and the improved dispersion characteristics were observed in the CI/GO mixture systems via a Turbiscan apparatus. To study the effectiveness of the GO additive more clearly, different weight ratios of GO in CI/GO mixture MR systems were compared.</P>
Zhang, Wen Ling,Choi, Hyoung Jin,Seo, Yongsok WILEY‐VCH Verlag 2013 Macromolecular chemistry and physics Vol.214 No.13
<P><B>Abstract</B></P><P>This paper reports a facile approach for fabricating core‐shell structured graphene oxide (GO)‐wrapped amine‐modified poly(glycidyl methacrylate) (ami‐PGMA) microspheres. The resulting core‐shell structure is confirmed by scanning electron micsroscopy (SEM) and transmission electron microscopy (TEM), whereas the coexistence of GO and PGMA is confirmed by FTIR spectroscopy. The thermal stability of the ami‐PGMA/GO microspheres is enhanced compared with that of pure PGMA microspheres. The novel ami‐PGMA/GO composite microsphere‐based electrorheological (ER) fluid shows typical ER characterization, using a rotational rheometer under an applied electric field. The dielectric analysis results along with the relaxation time and achievable polarizability of the fluid are correlated with the ER performance using a LCR meter.</P>
Graphene oxide based smart fluids
Zhang, Wen Ling,Choi, Hyoung Jin The Royal Society of Chemistry 2014 SOFT MATTER Vol.10 No.35
<P>Graphene oxide (GO), a graphene-related material containing oxygen-functional groups, has attracted considerable attention because of its strongly hydrophilic behavior and potential use in GO-hybrid composites. We put our focus on the fabrication and rheological characteristics of GO-based electrorheological and magnetorheological smart fluids under electric and magnetic fields, respectively in this Highlight. A brief perspective on the significant role of GO in tribology and the amphiphilic characteristics of Pickering emulsions are also included.</P> <P>Graphic Abstract</P><P>In this Highlight, we revisit the outstanding electrorheological and magnetorheological characteristics of diverse GO-based novel smart materials. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4sm01151a'> </P>
Zhang, Wen Ling,Liu, Ying Dan,Choi, Hyoung Jin Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.19
<P>Core–shell structured polystyrene (PS)–graphene oxide (GO) microspherical particles were synthesized by adsorbing the GO sheets on the PS surface through a strong π–π stacking interaction. As core materials, monodispersed PS microspheres were prepared using a dispersion polymerization, while the shell part of GO was synthesized by a modified Hummers method. Morphology of the composite particles was studied by both scanning electron microscopy and transmission electron microscopy, while their structure and chemical components were examined <I>via</I> X-ray diffraction and Fourier-transform infrared spectroscopy, respectively. All the data confirmed the coexistence of PS and GO with the expected core–shell structure of the composite. In addition, for the study on the electroresponsive behavior, the composite was dispersed in silicone oil and its electrorheological (ER) characteristics were examined <I>via</I> both an optical microscope and a rotational rheometer which was equipped with a high voltage source. Without an electric field, it behaved like a fluid, however, when an external electric field is present, the particles became polarized and demonstrated typical chain-like ER structures.</P> <P>Graphic Abstract</P><P>Core–shell structured polystyrene–graphene oxide (PS/GO) microspheres were synthesized <I>via</I> adsorbing GO sheets on the PS surface. The composite shows typical electrorheological characteristics under an applied electric field <I>via</I> both an optical microscope and a rotational rheometer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm10323g'> </P>
Wen Ling Zhang,최형진 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.9
A suspension of semiconducting graphene oxide/polyaniline (GO/PANI) composite dispersed in silicone oil is considered as one of potential candidates for electrorheological (ER) fluids. The GO/PANI composite was synthesized by chemical oxidation polymerization of aniline in the presence of GO dispersion, in which the GO was prepared by a modified Hummers method. The characteristics of the composite were examined by SEM image and FT-IR spectra, indicating the coexistence of GO and PANI in the composite. The GO/PANI composite based ER fluid was prepared by dispersing the fabricated particles in silicone oil, and its dynamic viscoelastic properties were measured using a rotational rheometer under different electric field, showing that the ER fluid exhibited typical solid-like ER behaviors.
Graphene and Graphene Oxide Composites and Their Electrorheological Applications
Zhang, Wen Ling,Liu, Jingquan,Choi, Hyoung Jin Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Graphene oxide (GO) based composite systems have been fabricated and investigated as a novel electroresponsive electrorheological (ER) dispersed phase because of their proper electrical conductivity and polarizability for their ER application, in addition to graphene composites. This paper briefly reviews mechanisms of the fabrication of various graphene and GO based composites and their critical ER characteristics including flow curve, yield stress, and dynamic properties measured using a rotational rheometer. Relaxation time and achievable polarizability from dielectric analysis using a LCR meter are also discussed.</P>