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Yang, Kwansoo,Kang, Yi Young,Ahn, Hyun Jeong,Kim, Dong-Gyun,Park, No Kyun,Choi, Siyoung Q.,Won, Jong Chan,Kim, Yun Ho Elsevier 2020 Journal of industrial and engineering chemistry Vol.82 No.-
<P><B>Abstract</B></P> <P>This work offers a simple fabrication of porous boron-nitride-(BN)/polyimide-(PI) composite films with high thermal diffusivities and low dielectric constants by combining high-internal-phase Pickering emulsification (HIPPE) and subsequent hot-pressing. BN nanoparticles in composite foams were well dispersed and three-dimensionally connected following the surface of the PI skeleton used as the polymer matrix. The BN contents in the BN/PI composite foams were adjusted in the range of 20–80wt%. The porosities of the composite films were controlled according to the hot-pressing conditions such as the temperature. The porous BN/PI composite films exhibited high thermal diffusivities of 0.059–1.033mm<SUP>2</SUP>/s and low dielectric constants of 2.08–3.48 at 1GHz for BN contents of 20–80wt%. In particular, the BN/PI composite films had extremely low dielectric loss values, close to zero (<0.002) at high frequencies regardless of the BN content and pressing conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous boron-nitride/polyimide (BN/PI) composites are fabricated via high internal phase Pickering emulsion (HIPPE). </LI> <LI> BN nanoparticles were uniformly dispersed on the surface of porous PI skeleton. </LI> <LI> 3D-connected BN nanoparticles on the surface of PI skeleton act as an efficient heat transfer path. </LI> <LI> Internal porous structure of BN/PI composite films enable to exhibit the extremely low dielectric properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kwansoo Yang,Yi Young Kang,Hyun Jeong Ahn,김동균,No Kyun Park,Siyoung Q. Choi,Jong Chan Won,Yun Ho Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Thiswork offers a simple fabrication ofporousboron-nitride-(BN)/polyimide-(PI) compositefilms withhighthermal diffusivities and low dielectric constants by combining high-internal-phase Pickering emulsification(HIPPE) and subsequent hot-pressing. BN nanoparticles in composite foams were well dispersed andthree-dimensionally connected following the surface of the PI skeleton used as the polymer matrix. The BNcontents in the BN/PI composite foams were adjusted in the range of 20–80 wt%. The porosities of thecompositefilms were controlled according to the hot-pressing conditions such as the temperature. Theporous BN/PI compositefilms exhibited high thermal diffusivities of 0.059–1.033 mm2/s and low dielectricconstants of 2.08–3.48 at 1 GHz for BN contents of 20–80 wt%. In particular, the BN/PI compositefilms hadextremely low dielectric loss values, close to zero (<0.002) at high frequencies regardless of the BN contentand pressing conditions.
Lewis, Tina A.,Tzeng, Yang-Sheng,McKinstry, Erin L.,Tooker, Angela C.,Hong, Kwansoo,Sun, Yanping,Mansour, Joey,Handler, Zachary,Albert, Mitchell S. Wiley Subscription Services, Inc., A Wiley Company 2005 Magnetic resonance in medicine Vol.53 No.2
<P>As another step toward extracting quantitative information from hyperpolarized <SUP>3</SUP>He MRI, airway diameters in humans were measured from projection images and multislice images of the lungs. Values obtained were in good agreement with the Weibel lung morphometry model. The measurement of airway caliber can now be achieved without the use of ionizing radiation. Furthermore, it was demonstrated that 3D airway tree renderings could be constructed from the multislice data. Both the measurement of airway diameters and the rendering of 3D airway information hold promise for the clinical assessment of bronchoconstrictive diseases such as asthma and the associated evaluation of treatment effectiveness. Work is being done to address the uncertainties of the manually intensive methods we have developed. Magn Reson Med 53:474–478, 2005. © 2005 Wiley-Liss, Inc.</P>