跳至主要内容

Interaction of Surfactants and Polyelectrolyte-Coated Liquid Crystal Droplets

Read full paper at:
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50968#.VFG4FVfHRK0

Author(s)
It is known that the adsorption of surfactants at the liquid crystal (LC)/aqueous interface can induce a bipolar-to-radial director configuration of LC droplets dispersed in aqueous solution. In this paper, we study the effect of charged polyelectrolyte-coating on the interaction of surfactants and LC droplet cores by observing the director configuration of the LC droplet cores as a function of surfactant concentrations. It is found that surfactants can penetrate into the polyelectrolyte coating and react with the LC droplet cores to induce the bipolar-to-radial transition of the LC inside the droplet cores. However, the concentration of charged surfactants required to induce the configuration transition of the LC droplet cores is affected by the charged polyelectrolyte coating. The effect is significantly enlarged with decreasing the alkyl chain length of charged surfactants. Our results highlight the possibility of engineering polyelectrolyte coatings to tune the interaction of LC droplets with analysts, which is critical towards designing LC droplet based sensors.
Cite this paper
Bera, T. and Fang, J. (2014) Interaction of Surfactants and Polyelectrolyte-Coated Liquid Crystal Droplets. Journal of Materials Science and Chemical Engineering, 2, 1-7. doi: 10.4236/msce.2014.211001. 
 

[1] Volovik, G.E. and Lavrentovich, O.D. (1983) Topological Dynamics of Defects: Boojums in Nematic Drops. Journal of Experimental and Theoretical Physics, 58, 1159-1167.
[2] Hsu, P., Poulin, P. and Weitz, D.A. (1998) Rotational Diffusion of Monodisperse Liquid Crystal Droplets. Journal of Colloid and Interface Science, 200, 182-184.
http://dx.doi.org/10.1006/jcis.1997.5223
[3] Juodkazis, S., Shikata, M., Takahashi, T., Matsuo, S. and Misawa, H. (1999) Fast Optical Switching by a Laser Manipulated Microdroplet of Liquid Crystal. Applied Physics Letters, 74, 3627-3629.
http://dx.doi.org/10.1063/1.123203
[4] Wood, T.A., Gleeson, H.F., Dickinson, M.R. and Wright, A.J. (2004) Mechanisms of Optical Angular Momentum Transfer to Nematic Liquid Crystalline Droplets. Applied Physics Letters, 84, 4292-4294.
http://dx.doi.org/10.1063/1.1753067
[5] Brasselet, E., Murazawa, N., Misawa, H. and Juodkazis, S. (2009) Optical Vortices from Liquid Crystal Droplets. Physical Review Letters, 103, 103903.
http://dx.doi.org/10.1103/PhysRevLett.103.103903
[6] Miller, D.S., Wang, X. and Abbott, N.A. (2014) Design of Functional Materials Based on Liquid Crystalline Droplets. Chemistry of Materials, 26, 496-506.
http://dx.doi.org/10.1021/cm4025028
[7] Lin, I.H., Miller, D.S., Bertics, P.J., Murphy, C.J., de Pablo, J.J. and Abbott, N.L. (2011) Endotoxin-Induced Structural Transformations in Liquid Crystalline Droplets. Science, 332, 1297-1300. http://dx.doi.org/10.1126/science.1195639
[8] Umbanhowar, P.B., Prasad, V. and Weitz, D.A. (2000) Monodisperse Emulsion Generation via Drop Break off in a Coflowing Stream. Langmuir, 16, 347-351.
http://dx.doi.org/10.1021/la990101e
[9] Tixier, T., Heppenstall-Butler, M., Terentjev, E.M., Tixier, T., Heppenstall-Butler, M. and Terentjev, E.M. (2006) Spontaneous Size Selection in Cholesteric and Nematic Emulsions. Langmuir, 22, 2365-2370.
http://dx.doi.org/10.1021/la0531953
[10] Tjipto, E., Cadwell, K.D., Quinn, J.F., Johnston, A.P.R., Caruso, F. and Abbott, N.L. (2006) Tailoring the Interfaces between Nematic Liquid Crystal Emulsions and Aqueous Phases via Layer-by-Layer Assembly. Nano Letters, 6, 2243-2248. http://dx.doi.org/10.1021/nl061604p
[11] Simon, K.A., Sejwal, P., Gerecht, R.B. and Luk, Y.-Y. (2007) Water-in-Water Emulsions Stabilized by Non-Amphiphilic Interactions: Polymer-Dispersed Lyotropic Liquid Crystals. Langmuir, 23, 1453-1458.
http://dx.doi.org/10.1021/la062203s
[12] Kinsinger, M.L., Buck, M.E., Abbott, N.L. and Lynn, D.M. (2010) Immobilization of Polymer-Decorated Liquid Crystal Droplets on Chemically Tailored Surfaces. Langmuir, 26, 10234-10242.
http://dx.doi.org/10.1021/la100376u
[13] Zou, J., Bera, T., Davis, A.A., Liang, W. and Fang, J.Y. (2011) Director Configuration Transitions of Polyelectrolyte Coated Liquid-Crystal Droplets. The Journal of Physical Chemistry B, 115, 8970-8974.
http://dx.doi.org/10.1021/jp201909m
[14] Aliño, V.A., Pang, J. and Yang, K.L. (2011) Liquid Crystal Droplets as a Hosting and Sensing Platform for Developing Immunoassays. Langmuir, 27, 11784-11789. http://dx.doi.org/10.1021/la2022215
[15] Khan, W., Choi, J.H., Kim, G.M. and Park, S.Y. (2011) Microfluidic Formation of pH Responsive 5CB Droplets Decorated with PAA-b-LCP. Lab on a Chip, 11, 3493-3498.
http://dx.doi.org/10.1039/c1lc20402e
[16] Bera, T. and Fang, J.Y. (2012) Polyelectrolyte-Coated Liquid Crystal Droplets for Detecting Charged Macromolecules. Journal of Materials Chemistry, 22, 6807-6812.
http://dx.doi.org/10.1039/C2JM00038E
[17] Aliño, V.J., Sim, P.H., Choy, W.T., Fraser, A. and Yang, K.Y. (2012) Detecting Proteins in Microfluidic Channels Decorated with Liquid Crystal Sensing Dots. Langmuir, 28, 17571-17577.
http://dx.doi.org/10.1021/la303213h
[18] Manna, U., Zayas-Gonzalez, Y.M., Carlton, R.J., Caruso, F., Abbott, N.L. and Lynn, D.M. (2013) Liquid Crystal Chemical Sensors That Cells Can Wear. Angewandte Chemie International Edition, 52, 14011-14015. http://dx.doi.org/10.1002/anie.201306630
[19] Kim, J., Khan, M. and Park, S.Y. (2013) Glucose Sensor Using Liquid-Crystal Droplets Made by Microfluidics. ACS Applied Materials Interfaces, 5, 13135-13139.
http://dx.doi.org/10.1021/am404174n
[20] Bera, T. and Fang, J.Y. (2014) Protein-Induced Configuration Transition of Polyelectrolyte-Modified Liquid Crystal Droplets. The Journal of Physical Chemistry B, 118, 4970-4977.
http://dx.doi.org/10.1021/jp501587h
[21] Murazawa, N., Juodkazis, S. and Misawa, H. (2005) Characterization of Bipolar and Radial Nematic Liquid Crystal Droplets Using Laser-Tweezers. Journal of Physics D: Applied Physics, 38, 2923-2927.
http://dx.doi.org/10.1088/0022-3727/38/16/027
[22] Bera, T. and Fang, J.Y. (2013) Optical Detection of Lithocholic Acid with Liquid Crystal Emulsions. Langmuir, 29, 387-392. http://dx.doi.org/10.1021/la303771t
[23] Malone, S.M. and Schwartz, D.K. (2008) Polar and Azimuthal Alignment of a Nematic Liquid Crystal by Alkylsilane Self-Assembled Monolayers: Effects of Chain-Length and Mechanical Rubbing. Langmuir, 24, 9790-9794. http://dx.doi.org/10.1021/la801322x
[24] Price, A.D. and Schwartz, D.K. (2007) Fatty-Acid Monolayers at the Nematic/Water Interface: Phases and Liquid-Crystal Alignment. The Journal of Physical Chemistry B, 111, 1007-1015.
http://dx.doi.org/10.1021/jp066228b
[25] Brake, J.M. and Abbott, N.L. (2002) An Experimental System for Imaging the Reversible Adsorption of Amphiphiles at Aqueous-Liquid Crystal Interfaces. Langmuir, 18, 6101-6109.
http://dx.doi.org/10.1021/la011746t
[26] Fang, J.Y., Gehlert, U., Shashidhar, R. and Knobler, C.M. (1999) Imaging the Azimuthal Tilt Order in Monolayers by Liquid Crystal Optical Amplification. Langmuir, 15, 297-299.
http://dx.doi.org/10.1021/la9812929                         eww141030lx
标签：

评论

发表评论

此博客中的热门博文

A Comparison of Methods Used to Determine the Oleic/Linoleic Acid Ratio in Cultivated Peanut (Arachis hypogaea L.)

Cultivated peanut ( Arachis hypogaea L.) is an important oil and food crop. It is also a cheap source of protein, a good source of essential vitamins and minerals, and a component of many food products. The fatty acid composition of peanuts has become increasingly important with the realization that oleic acid content significantly affects the development of rancidity. And oil content of peanuts significantly affects flavor and shelf-life. Early generation screening of breeding lines for high oleic acid content greatly increases the efficiency of developing new peanut varieties. The objective of this study was to compare the accuracy of methods used to classify individual peanut seed as high oleic or not high oleic. Three hundred and seventy-four (374) seeds, spanning twenty-three (23) genotypes varying in oil composition (i.e. high oleic (H) or normal/not high oleic (NH) inclusive of all four peanut market-types (runner, Spanish, Valencia and Virginia), were individually tested ...
发表评论
阅读全文

Location Optimization of a Coal Power Plant to Balance Costs against Plant’s Emission Exposure

Fuel and its delivery cost comprise the biggest expense in coal power plant operations. Delivery of electricity from generation to consumers requires investment in power lines and transmission grids. Placing a coal power plant or multiple power plants near dense population centers can lower transmission costs. If a coalmine is nearby, transportation costs can also be reduced. However, emissions from coal plants play a key role in worsening health crises in many countries. And coal upon combustion produces CO 2 , SO 2 , NO x , CO, Metallic and Particle Matter (PM10 & PM2.5). The presence of these chemical compounds in the atmosphere in close vicinity to humans, livestock, and agriculture carries detrimental health consequences. The goal of the research was to develop a methodology to minimize the public’s exposure to harmful emissions from coal power plants while maintaining minimal operational costs related to electric distribution losses and coal logistics. The objective was...
发表评论
阅读全文

Evaluation of the Safety and Efficacy of Continuous Use of a Home-Use High-Frequency Facial Treatment Appliance

At present, many home-use beauty devices are available in the market. In particular, many products developed for facial treatment use light, e.g., a flash lamp or a light-emitting diode (LED). In this study, the safety of 4 weeks’ continuous use of NEWA TM , a high-frequency facial treatment appliance, every alternate day at home was verified, and its efficacy was evaluated in Japanese individuals with healthy skin aged 30 years or older who complained of sagging of the facial skin.  Transepidermal water loss (TEWL), melanin levels, erythema levels, sebum secretion levels, skin color changes and wrinkle improvement in the facial skin were measured before the appliance began to be used (study baseline), at 2 and 4 weeks after it had begun to be used, and at 2 weeks after completion of the 4-week treatment period (6 weeks from the study baseline). In addition, data obtained by subjective evaluation by the subjects themselves on a visual analog scale (VAS) were also analyzed. Fur...
发表评论
阅读全文