表面活性剂对高浓度石墨烯水分散液制备的影响
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摘要
分别选取阴离子型、阳离子型和非离子型3种类型表面活性剂,通过紫外可见光谱研究表面活性剂结构和浓度对高压均质-液相剥离法制备的石墨烯水分散液浓度的影响。通过高分辨透射电镜和激光粒度仪对所制备的石墨烯的品质进行分析。结果表明:长的疏水链段、双键和苯环官能团是促进表面活性剂作用发挥的关键结构,表面活性剂最优浓度略高于其临界胶束浓度。在测试范围内,Tween80效果最佳,其最佳作用浓度为0.012mmol·L~(-1),所得石墨烯水分散液浓度为564.3mg·L~(-1)。表面活性剂的结构和浓度对石墨烯的品质无明显影响。
The effects of surfactant structure and concentration on the preparation of high concent-ration graphene aqueous dispersion by HPH-LPE were systematically studied by UV-Vis spectra, TEM and laser granularity analyser. Three different types of surfactants were used: anionic,cationic and non-ionic. It is found that long hydrophobic segment, double bond and benzene ring structure is the key structure that can promote the performance of the surfactant and the optimum concentration of the surfactant is slightly higher than critical micelle concentration(C_(CMC)).In the test range, Tween80 presents the best performance. The optimum concentration is 0.012 mmol·L~(-1),and the obtained graphene aqueous dispersion concentration is 564.3 mg·L~(-1). However, it seems no significant effect on the graphene quality of surfactant structure and concentration.
The effects of surfactant structure and concentration on the preparation of high concent-ration graphene aqueous dispersion by HPH-LPE were systematically studied by UV-Vis spectra, TEM and laser granularity analyser. Three different types of surfactants were used: anionic,cationic and non-ionic. It is found that long hydrophobic segment, double bond and benzene ring structure is the key structure that can promote the performance of the surfactant and the optimum concentration of the surfactant is slightly higher than critical micelle concentration(C_(CMC)).In the test range, Tween80 presents the best performance. The optimum concentration is 0.012 mmol·L~(-1),and the obtained graphene aqueous dispersion concentration is 564.3 mg·L~(-1). However, it seems no significant effect on the graphene quality of surfactant structure and concentration.
引文
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[5] BALANDIN A A,GHOSH S,BAO W,et al.Superior thermal conductivity of single-layer graphene[J].Nano Letter,2008,8(3):902-907.
[6] PENG S K,YAN S J,WANG N,et al.Fluorinated graphene/sulfur hybrid cathode for high energy and high power density lithium primary batteries[J].RSC Advances,2018,8(23):12701-12707.
[7] BOURLINOS A B,GEORGAKILAS V,ZBORIL R,et al.Liquid-phase exfoliation of graphite towards solubilized graphenes[J].Small,2009,5(16):1841-1845.
[8] HERNANDEZ Y,NICOLOSI V,LOTYA M,et al.High-yield production of graphene by liquid-phase exfoliation of graphite[J].Nature Nanotechnology,2008,3(9):563-568.
[9] SHANG J,XUE F,DING E.Facile fabrication of few-layer graphene and graphite nanosheets by high pressure homogeniza-tion[J].Chemical Communications,2015,51:15811-15814.
[10] NADCKEEN T J,DAMM C,WALER J.Delamination of graphite in a high pressure homogenizer[J].RSC Adv,2015,5(71):57328-57338.
[11] TEXTER J.Graphene dispersions[J].Current Opinion in Colloid & Interface Science,2014,19(2):163-174.
[12] WANG S,ZHANG Y,ABIDI N,et al.Wettability and surface free energy of graphene films[J].Langmuir,2009,25(18):11078-11081.
[13] DU W,JIANG X,ZHU L.From graphite to graphene:direct liquid-phase exfoliation of graphite to produce single- and few layered pristine graphene[J].Journal of Materials Chemistry A,2013,1:10592-10606.
[14] LOTYA M,KING P J,KHAN U,et al.High-concentration,surfactant-stabilized graphene dispersions[J].ACS Nano,2010,4(6):3155-3162.
[15] LOTYA M,HERNANDEZ Y,KING P J,et al.Liquid phase production of graphene by exfoliation of graphite in surfactant/water solutions[J].Journal of American Chemical Society,2009,131(10):3611-3620.
[16] YANG H,HERNANDEZ Y,SCHLIERF A,et al.A simple method for graphene production based on exfoliation of graphite in water using 1-pyrenesulfonic acid sodium salt[J].Carbon,2013,53:357-365.
[17] KUMAR V,PARASCHINOIU M,NIGAN K D P.Single-phase fluid flow and mixing in microchannels[J].Chemical Engineering Science,2011,66(7):1329-1373.
[18] RAMALINGAM P,PUSULURI S T,PERIASAMY S,et al.Role of deoxy group on the high concentration of graphene in surfactant/water media[J].RSC Advances,2013,3(7):2369-2378.
[19] SCHLIERF A,YANG H,GEBREMEDHN E,et al.Nanoscale insight into the exfoliation mechanism of graphene with organic dyes:effect of charge,dipole and molecular structure[J].Nanoscale,2013,5(10):4205-4216.
[20] 王晨,燕绍九,南文争,等.高浓度石墨烯水分散液的制备与表征[J].材料工程,2019,47(4):1-6.WANG C,YAN S J,NAN W Z,at al.Preparation and characterization of high concentration graphene aqueous disper-sion[J].Journal of Materials Engineering,2019,47(4):1-6.
[21] KUMAR P,BOHIDAR H B.Aqueous dispersion stability of multi-carbon nanoparticles in anionic,cationic,neutral,bile salt and pulmonary surfactant solutions[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2010,361:13-24.
[22] JOHNSON D W,DOBSON B P,COLEMAN K S.A manu-facturing perspective on graphene dispersions[J].Current Opinion in Colloid & Interface Science,2015,20(5):367-382.
[23] KUMAR P,PANI B,BATRA H,et al.The influence of different surfactants on the dispersion behavior of single wall carbon nanotube (SWNT) [J].International Journal of Engineering Technology and Sciences,2014,5(2):16-21.
[24] SHIN J Y,PREMKUMAR T,GECKELER K E.Dispersion of single-walled carbon nanotubes by using surfactants:are the type and concentration important?[J].Chemistry,2008,14(20):6044-6048.
[25] SMITH R J,LOTYA M,COLEMAN J N.The importance of repulsive potential barriers for the dispersion of graphene using surfactants[J].New Journal of Physics,2010,12(12):135-141.