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RISS 인기검색어
- 검색키워드
- 저자 : ( Alvin Orbaek White ) (검색결과 3 건)
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Size dependent conduction characteristics of catalyst-multi-walled carbon nanotube junction
Barnett Chris J.,Orbaek White Alvin,Barron Andrew R. 한국탄소학회 2021 Carbon Letters Vol.31 No.5
Multi-walled carbon nanotubes (MWCNTs) grown by chemical vapor deposition retain the residual catalyst particles from which the growth occurred, which are considered a detriment to MWCNTs’ performance, especially electrical conductivity. The frst direct measurements have been made of the electrical transport through the catalyst cap into the MWCNT using nanoscale 2-point-probe to determine the efects of the catalyst particle’s size and the diameter ratio with its associated MWCNT on the electrical transport through the catalyst cap as compared to the inherent conductivity of the MWCNT. The MWCNT diameter is independent of the catalyst size, but the ratio of the catalyst cap diameter to MWCNT diameter (DC/DNT) determines the conduction mechanism. Where DC/DNT is greater than 1 the resulting I–V curve is near ohmic, and the conduction through the catalyst (RC+NT) approaches that of the MWCNT (RNT); however, when the DC/DNT<1 the I–V curves shift to rectifying and RC+NT> >RNT. The experimental results are discussed in relation to current crowding at the interface between catalyst and nanotube due to an increased electric feld.
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Replica molding of vertically aligned liquid crystalline polymer microstructures
위정재,( Hangbo Zhao ),( Davor Copic ),( Alvin Orbaek White ),( Sanha Kim ),( A. John Hart ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Molecularly anisotropic polymers can be manufactured into a wide variety of forms capable of actuation upon application of external stimuli. In particular, incorporation of the liquid crystal molecules in polymeric networks enables facile route to align mesogenic units within microstructures. Most studies of current thermomechanical actuation of liquid crystalline polymers have used millimeter-scale and larger shapes, and only a few studies reported thermally responsive liquid crystal polymer microstructures. Here we present the thermomechanical response of glassy azobenzene-functionalized liquid crystalline polymer networks in micropillar geometries. Large-arrays of uniform polymer microstructures are fabricated by replica molding of using a polydimethylsiloxane (PDMS) template, and the molecular orientation of the polymer is manipulated by applying a magnetic field during photocuring the molten monomer mixture in the mold. We discuss how the micropillar and liquid crystal geometry influence the stimuli response from the highly crosslinked polymer network.
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Upcycling of face masks to application-rich multi- and single-walled carbon nanotubes
Gangoli Varun Shenoy,Mahy Thomas,Yick Tim,Niu Yubiao,Palmer Richard E.,Orbaek White Alvin 한국탄소학회 2022 Carbon Letters Vol.32 No.7
We report the use of face mask materials as a carbon precursor for the synthesis of multi- and single-walled carbon nanotubes (CNTs) in an open-loop chemical recycling process. Novel surgical mask precursors were suspended in toluene and injected into a chemical vapor deposition reactor previously optimized for CNT production using liquid injection. The CNTs were collected and characterized using resonant Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) before being turned into fibrils that were tested for electrical conductance. Once confirmed and repeated for statistical accuracy, a CNT-based Ethernet cable was manufactured and tested using iPerf3 for uplink and downlink speeds exceeding broadband standards worldwide. Radial breathing modes from Raman spectroscopy indicate single walled CNTs (SWCNTs) with diameters ranging from 0.8 to 1.55 nm and this matches well with TEM observations of SWCNTs with 1.5 nm diameter. This work pushes the horizon of feedstocks useful for CNT and SWCNT production in particular; this work demonstrates upcycling of materials fated for disposal into materials with positive net value and plenty of real-world applications.
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