共沸物混合气体中收集碳链C_8H_2
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摘要
为了大批量制备高纯碳链样品并研究利用液相电弧放电法制备碳链的机理,提出了一种新的碳链收集方法.采用乙醇溶液收集电弧放电过程中产生的逸出气体并分析逸出气体的组成成分.利用高效液相色谱仪对逸出气体和乙醇溶液进行分离,并对逸出气体的吸收光谱进行了分析.结果表明,逸出气体中含有大量以C8H2为主的短碳链,且其组成成分和在甲醇溶液的碳链蒸馏过程中得到的共沸物成分一致,表明电弧放电过程中产生的逸出气体是一种含有碳链的共沸物,通过收集放电时产生的逸出气体可以大批量制备短碳链C_8H_2.
In order to prepare the high-purity carbon chain samples at large scale and study the preparation mechanism of carbon chains with liquid arc discharge method,a newcollection method for carbon chains was proposed. The overflowed gas generated in the arc discharge process was collected with ethanol solution,and the consitituent of overflowed gas was analyzed. In addition,the overflowed gas was seperated from the ethanol solution with the high performance liqiud chromatograph,and the absorption spectra of the overflowed gas were analyzed. The results showthat the overflowed gas contains a large quantity of short carbon chains maily composed of C_8H_2,and the component of overflowed gas is consistent with that of azeotrope obtained during the distillation of carbon chains in methanol solution. It indicates that the overflowed gas generated in the arc discharge process is an azeotrope with carbon chains. Furthermore,the short carbon chains C_8H_2 at a large scale can be produced through collecting the overflowed gas generated in the arc discharge process.
In order to prepare the high-purity carbon chain samples at large scale and study the preparation mechanism of carbon chains with liquid arc discharge method,a newcollection method for carbon chains was proposed. The overflowed gas generated in the arc discharge process was collected with ethanol solution,and the consitituent of overflowed gas was analyzed. In addition,the overflowed gas was seperated from the ethanol solution with the high performance liqiud chromatograph,and the absorption spectra of the overflowed gas were analyzed. The results showthat the overflowed gas contains a large quantity of short carbon chains maily composed of C_8H_2,and the component of overflowed gas is consistent with that of azeotrope obtained during the distillation of carbon chains in methanol solution. It indicates that the overflowed gas generated in the arc discharge process is an azeotrope with carbon chains. Furthermore,the short carbon chains C_8H_2 at a large scale can be produced through collecting the overflowed gas generated in the arc discharge process.
引文
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[2]Artyukhov V I,Liu M,Yakobson B I.Mechanically induced metal-insulator transition in carbyne[J].Nano Letters,2013,14(8):4224-4229.
[3]Tarakeshwar P,Buseck P R,Kroto H W.Pseudocarbynes:charge-stabilized carbon chains[J].The Journal of Physical Chemistry Letters,2016,7(9):1675-1681.
[4]Shi L,Rohringer P,Suenaga K,et al.Confined linear carbon chains as a route to bulk carbyne[J].Nature Materials,2016,15(6):634-639.
[5]Franz M,Januszewski J A,Wendinger D,et al.Cumulene rotaxanes:stabilization and study of
[9]cumulenes[J].Angewandte Chemie International Edition,2015,54(22):6645-6649.
[6]Andrade N F,Vasconcelos T L,Gouvea C,et al.Linear carbon chains encapsulated in multiwall carbon nanotubes:resonance Raman spectroscopy and transmission electron microscopy studies[J].Carbon,2015,90:172-180.
[7]Movsisyan L D,Franz M,Hampel F,et al.Polyyne rotaxanes:stabilization by encapsulation[J].Journal of the American Chemical Society,2016,138(4):1366-1376.
[8]Cretu O,Botello-Mendez A R,Janowska I,et al.Electrical transport measured in atomic carbon chains[J].Nano Letters,2013,13(8):3487-3493.
[9]Chernick E T,Tykwinski R R.Carbon-rich nanostructures:the conversion of acetylenes into materials[J].Journal of Physical Organic Chemistry,2013,26(9):742-749.
[10]Movsisyan L D,Peeks MD,Greetham G M,et al.Photophysics of threaded sp-carbon chains:the polyyne is a sink for singlet and triplet excitation[J].Journal of the American Chemistry Society,2014,136(52):17996-18008.
[11]Fazio E,Neri F,PatanèS,et al.Optical limiting effects in linear carbon chains[J].Carbon,2011,49(1):306-310.
[12]Ballmann S,Hieringer W,Secker D,et al.Molecular wires in single-molecule junctions:charge transport and vibrational excitations[J].Chem Phys Chem,2010,11(10):2256-2260.
[13]Moreno-García P,Gulcur M,Manrique D Z,et al.Singlemolecule conductance of functionalized oligoynes:length dependence and junction evolution[J].Journal of the American Chemical Society,2013,135(33):12228-12240.
[14]An K,Wei G,Qi G,et al.Stability improvement of C8H2and C10H2embedded in poly(vinyl alcohol)films with adsorption on gold nanoparticles[J].Chemical Physics Letters,2015,637:71-76.
[15]赵新洛,谭泓,张一帆,等.四氧化三锰/石墨烯超级电容器的制备及分析[J].沈阳工业大学学报,2014,36(6):636-641.(ZHAO Xin-luo,TAN Hong,ZHANG Yi-fan,et al.Synthesis and analysis of Mn3O4/graphene supercapacitor[J].Journal of Shenyang University of Technology,2014,36(6):636-641.)
[16]Tabata H,Fujii M,Hayashi S,et al.Raman and surfaceenhanced Raman scattering of a series of size-separated polyynes[J].Carbon,2006,44(15):3168-3176.
[17]Matsutani R,Inoue K,Sanada T,et al.Preparation of long-chain polyynes of C28H2and C30H2by liquidphase laser ablation[J].Journal of Photochemistry and Photobio Logy A:Chemistry,2012,240(13):1-4.
[18]Li Y,An K,Sheng L,et al.Surface-enhanced Raman scattering investigations of C2nH2(n=4-6)in asprepared and dried Ag colloid[J].Chemical Physics Letters,2015,631/632:12-15.
[19]Hanamura K,Fujii M,Wakabayashi T,et al.Surfaceenhanced Raman scattering of size-selected polyynes(C8H2)adsorbed on silver colloidal nanoparticles[J].Chemical Physics Letters,2011,503(1/2/3):118-123.