荧光碳量子点-锂皂石乳化的ASA Pickering乳液及应用
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摘要
利用荧光碳量子点(CDs)和锂皂石协同乳化烯基琥珀酸酐(ASA) Pickering乳液,研究了CDs-锂皂石对ASA乳液性能的影响,并将乳化的ASA Pickering乳液进行纸张施胶应用。结果表明,提高CDs用量,CDs-锂皂石复配颗粒接触角增大,在锂皂石用量0. 050 g、CDs用量1. 000 g时,CDs-锂皂石乳化的ASA Pickering乳液稳定性最好,乳液粒径最小,并且均为水包油型乳液。激光共聚焦显微镜下观察到CDs-锂皂石吸附在油水两相界面处,形成一层界面颗粒膜,提高了乳液的稳定性。当CDs-锂皂石用量为1%(相对于ASA)、ASA用量为0. 2%(相对于绝干浆)进行浆内施胶时,纸张施胶度为73 s,继续提高CDs-锂皂石用量时,纸张施胶度和ASA的水解稳定性提高。
The effects of fluorescent carbon quantum dots( CDs) and laponite on the properties of alkenyl succinic anhydride( ASA) emulsions were investigated by synergistic emulsification of ASA Pickering emulsion,a novel ASA paper sizing agent emulsion,with CDs and laponite. The results showed that the contact angle of the CDs-laponite particles decreased with the increase of the amount of CDs or laponite,the ASA Pickering emulsion emulsified by 0. 050 g laponite and 1. 000 g CDs had the best stability and the smallest emulsion particle size,and all the ASA emulsions prepared were oil-in-water Pickering emulsion. Confocal microscope showed that the CDs-laponite particles were adsorbed at the interface between oil and water and formed an interface particle film,which improved the stability of the emulsion. The paper sizing degree was 73 s when the dosage of ASA was 0. 2%( based on dry pulp,wt%) with 1%( based on ASA,wt%) of CDs-laponite. Increasing the amount of CDs-laponite particle,both the paper sizing degree and the hydrolytic stability of ASA were improved.
The effects of fluorescent carbon quantum dots( CDs) and laponite on the properties of alkenyl succinic anhydride( ASA) emulsions were investigated by synergistic emulsification of ASA Pickering emulsion,a novel ASA paper sizing agent emulsion,with CDs and laponite. The results showed that the contact angle of the CDs-laponite particles decreased with the increase of the amount of CDs or laponite,the ASA Pickering emulsion emulsified by 0. 050 g laponite and 1. 000 g CDs had the best stability and the smallest emulsion particle size,and all the ASA emulsions prepared were oil-in-water Pickering emulsion. Confocal microscope showed that the CDs-laponite particles were adsorbed at the interface between oil and water and formed an interface particle film,which improved the stability of the emulsion. The paper sizing degree was 73 s when the dosage of ASA was 0. 2%( based on dry pulp,wt%) with 1%( based on ASA,wt%) of CDs-laponite. Increasing the amount of CDs-laponite particle,both the paper sizing degree and the hydrolytic stability of ASA were improved.
引文
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[2]Hunter T N,Pugh R J,Franks G V,et al.The role of particles in stabilising foams and emulsions[J].Advances in Colloid&Interface Science,2008,137(2):57.
[3]Binks B P,Liu W,Rodrigues J A.Novel stabilization of emulsions via the heteroaggregation of nanoparticles.[J].Langmuir the Acs Journal of Surfaces&Colloids,2008,24(9):4443.
[4]Gu G,Zhang L,Wu X A,et al.Isolation and characterization of interfacial materials in bitumen emulsions[J].Energy&Fuels,2006,20(2):673.
[5]Zhou J,Qiao X,Sun K.Advance in the Investigations of the Preparation and Application of Pickering Emulsion[J].Chemistry,2012,75(2):99.周君,乔秀颖,孙康.Pickering乳液的制备和应用研究进展[J].化学通报,2012,75(2):99.
[6]Grim R.Applied clay Mineralogy[J].Geologisea F9reningen Stockholm F9rhandlingar,1962,84(4):1.
[7]Hansen E L,Hemmen H,Fonseca D M,et al.Swelling transition of a clay induced by heating.[J].Scientific Reports,2012,2(8):618.
[8]Kegel W K,Lekkerkerker H N.Colloidal gels:Clay goes patchy[J].Nature Materials,2011,10(1):5.
[9]Nadeau P H,Wilson M J,Mchardy W J,et al.Interstratified Clays as Fundamental Particles:A Reply[J].Science,1984,225(4665):923.
[10]Pinnavaia T J.Intercalated clay catalysts[J].Science,1983,220(4595):365.
[11]Isogai A.The reason why the reactive chemical structure of alkenyl succinic anhydride is necessary for efficient paper sizing[J].Fiber,2001,56(7):334.
[12]Binks B P,Lumsdon S O,LUMSDON S O.Catastrophic Phase Inversion of Water-in-Oil Emulsions Stabilized by Hydrophobic Silica[J].Langmuir,2000,16(6):2539.
[13]Gao Dalei,Lin Zhaoyun,Li Youming.Properties and Application of the Pickering-type ODSA Emulsion Stabilized by pH-sensitive NanoSiO2Particles[J].Transactions of China Pulp and Paper,2016,31(4):12.高大磊,林兆云,李友明.p H敏感型纳米二氧化硅乳化的OD-SA施胶剂乳液及其应用[J].中国造纸学报,2016,31(4):12.
[14]Zhang W,Fan J.Red shift in the photoluminescence of colloidal carbon quantum dots induced by photon reabsorption[J].Applied Physics Letters,2014,104(9):6726.
[15]Song G Y,Zhu S,Yang B.Bioimaging based on fluorescent carbon dots[J].Rsc.Advances,2014,4(52):27184.
[16]Linehan K,Doyle H.Efficient one-pot synthesis of highly monodisperse carbon quantum dots[J].Rsc.Advances,2013,4(1):18.
[17]Yang S,Cao L,Luo P G,et al.Carbon Dots as Nontoxic and HighPerformance Fluorescence Imaging Agents[J].Journal of Physical Chemistry C Nanomaterials&Interfaces,2009,113(42):18110.
[18]Liu S,Tian J,Wang L,et al.Hydrothermal treatment of grass:a low-cost,green route to nitrogen-doped,carbon-rich,photoluminescent polymer nanodots as an effective fluorescent sensing platform for label-free detection of Cu(II)ions[J].Advanced Materials,2012,24(15):2037.
[19]Zhang H,Huang H,Liu Y,et al.Porous and hollow metal-layer@SiO2nanocomposites as stable nanoreactors for hydrocarbon selective oxidation[J].Journal of Materials Chemistry,2012,22(38):20182.
[20]Ding Pengxiang,Liu Wenxia.Preparation of ASA Emulsions with Butylamine Modified Laponite and Its Sizing Performance[J].China Pulp&Paper,2011,30(10):1.丁鹏翔,刘温霞.正丁胺改性锂皂石制备ASA Pickering乳液及其施胶性能的研究[J].中国造纸,2011,30(10):1.
[21]Binks B P,Lumsdon S O.Stability of oil-in-water emulsions stabilised by silica particles[J].Physical Chemistry Chemical Physics,1999,1(12):3007.
[22]Lagaly G,Reese M,Abend S.Smectites as colloidal stabilizers of emulsions:I.Preparation and properties of emulsions with smectites and nonionic surfactants[J].Applied Clay Science,1999,14(1-3):83.
[23]Binks B P,Fletcher P D,Thompson M A,et al.Influence of propylene glycol on aqueous silica dispersions and particle-stabilized emulsions[J].Langmuir,2013,29(19):5723.