Abstract
Colloid suspensions in nematic liquid crystal were employed for the first time in 2004 as a tool for the partial orientation of solids, to be examined by linearly polarized IR-(IR-LD) spectroscopy. It has been found is found that a partial orientation (15–20%) of suspended particles, is adequate for the recording of reasonable linearly polarized IR-spectra is achieved when: 5 ± 1% by weight of the given solid compound (organic, inorganic, transition metal complex or glass) with particle size within the limits 0.3–0.9 μm is mixed with a nematic liquid crystal substance (ZLI 1695, ZLI 1538 or MLC 6815) suitable for IR spectroscopy and the slightly viscous suspension obtained is phase pressed between two KBr-plates. These latter are roughened in one direction prior to use with fine sandpaper (C800) (size 5 μm). Then, the KBr-plattes and pressed suspension are moved repeatedly with 3 μm/s for 100 times. The optimal cell thickness is 100 μm. If mathematical procedures are used for polarized IR-spectra interpretation, then it is possible to perform structural elucidation of the embedded compounds, independently of their melting point, crystalline or amorphous state, and the quality of the monocrystals or polycrystalline of the e sample. The method permits the study of organic and inorganic compounds, transition metal complexes and glasses. Here we will discuss the fundamental questions concerning the above state such as the morphology of the suspended particles, the particle size, the influence of the physical chemistry properties of liquid crystal medium on the degree of orientation of suspended particles; the velocity of the shearing of the suspension, the degree of the roughening of the KBr-plates and their effects on the degree of orientation, the influence of the space group on the orientation parameter, the nature and balance of the forces acting on the suspended particles; their degree of orientation, the mathematical model used. Conventional and linearly polarized IR-spectroscopy and electron microscopy are used for elucidation of these points. Statistical approaches have also been applied in order to estimate the impact of the experimental parameters (size, velocity, thickness) on the IR-signal for each of the 13 systems studied. An experimental design of the type involving full factorial design on two levels of variation of the input factors is presented.
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References
Soville, D.A., Russel, W.B., Schowaiter, W.R.: Colloidal dispersions. Cambridge University Press, Cambridge (1989)
Ruhwandl, A.P., Zukoski, E.M.: Electrorheological fluids as colloidal suspensions. Adv. Collid. Interface Sci. 30, 153 (1989)
Poulin, P., Stark, H., Lubensky, T.C., Weitz, D.A.: Novel colloidal interactions in anisotropic fluids. Science 275, 1770 (1997)
Poulin, P., Frances, N., Mondain-Monval, O.: Suspension of spherical particles in nematic solutions of disks and rods. Phys. Rev. E 59, 4384 (1999)
Borstnik, A., Stark, H., Zumer, S.: Interaction of spherical particles dispersed in a liquid crystal above the nematic-isotropic phase transition. Phys. Rev. E 60, 4210 (1999)
Lev, B.I., Aoki, K.M., Tomchuk, P.M., Yokoyama, H.: Structure formation of colloids in nematic liquid crystals. Condens. Matter Phys. 6, 169 (2003)
Feng J.J., Zhou, Ch.: A mean-field study of defects near colloidal particles in a nematic liquid crystal. J. Colloid Interface Sci. 269, 72 (2004)
Terentjev, E.M.: Disclination loops, standing alone and around solid particles, in nematic liquid crystals. Phys. Rev. E 51, 1330 (1995)
Stark, H.: Numerical investigation of liquid crystal colloids using a continuum description. Phys. Rev. 351, 387 (2001)
Loudet, J-C., Barois, P., Poulin, P.: Colloidal ordering from phase separation in a liquid crystalline continuous phase. Nat. Lond. 407, 611 (2000)
Meeker, S.P., Poon, W.C.K., Crain, J., Terentjev, E.M.: Colloid-liquid-crystal composites: an unusual soft solid. Phys. Rev. E 61, R6083 (2000)
Nazarenko, V.G., Nych, A.B., Lev, B.I.: Crystal structure in nematic emulsion. Phys. Rev. Lett. 87, 075504 (2001)
Stark, H.: Saturn-ring defects around microspheres suspended in nematic liquid crystals: an analogy between confined geometries and magnetic fields. Phys. Rev. E 66, 032701 (2002)
Ivanova, B.B., Arnaudov, M.G., Bontchev, P.R.: Linear-dichroic infrared spectral analysis of Cu(I)-homocysteine complex. Spectrochim. Acta 60A, 855 (2004)
Michl J., Thulstrup E.W.: Spectroscopy with polarized light. Solute alignment by photoselection, in liquid crystals, polymers, and membranes. VCH Publishers, New York (1986)
Thulstrup, E.W., Eggers, J.H.: Moment directions of the electronic transitions of fluoranthene. Chem. Phys. Lett. 1, 690 (1996)
Thulstrup, E.W., Thulstrup, P.W.: Polarization spectroscopic studies of ordered molecules. Acta Chim. Slov. 52, 371 (2005)
Frushour, B.G., Painter, P.C., Koening, J.L.: Vibrational spectra of polypeptides. J. Macromol. Sci. C15, 29 (1976)
Jasse, B., Koening, J.L.: Orientational measurements in polymers using vibrational spectroscopy. J. Macromol. Sci. C17, 61 (1979)
Zbinden R.: Infrared spectroscopy of high polymers. Academic Press, New York (1964)
Siesler H.W.: Characterization of polymer deformation by vibrational spectroscopy. In: Orientated polymer materials. Chap. 4, St. Fakirov (ed.) Huethling Wepf Verlag Zug. Heidelberg, Oxford CT, USA, (1996)
Ivanova, B.B.: Solid state linear dichroic infrared spectral analysis of benzimidazoles and their N1-protonated salts. Spectrochim. Acta 62A, 58 (2005)
Ivanova, B.B., Mayer-Figge, H.: Crystal structure. and solid state IR-LD analysis of a mononuclear Cu(II) complex of 4-aminopzridine. J. Coord. Chem. 58, 653 (2005)
Ivanova, B.B.: Monoclinic and orthorhombic polymorphs of paracetamol—solid state linear dichroic infrared spectral analysis. J. Mol. Struct. 738, 233 (2005)
Bakalska R., Ivanova B.B., Kolev, Ts.: Solid-state IR-LD spectroscopy of codeine, N-norcodeine derivatives. Cent. Eur. J. Chem. 4, 533 (2006)
Ivanova, B.B.: Stereo-structural and IR-spectral characterization of histidine containing dipeptides by means of solid-state IR-LD spectroscopy and ab initio calculations. J. Mol. Struct. 782, 122 (2006)
Ivanova, B.B., Kolev, T., Zareva, S.Y.: Mononuclear Au(III)-complexes with tryptophan-containing dipeptides: Synthesis, spectroscopic and structural elucidation. Biopolymers 82, 587 (2006)
Kolev, T.: Solid-state IR-LD spectroscopic and theoretical analysis. of arginine-containing peptides. Biopolymers 83, 39 (2006)
Kolev, T., Koleva, B., Shivachev, B.: Oriented solids as a colloid suspension in nematic liquid crystal as a new tool for IR-spectroscopic and structural elucidation of inorganic compounds and glasses. Inorg. Chim. Acta (2007, in press)
Ivanova, B.B., Tsalev, D.L., Arnaudov, M.G.: Validation of reducing-difference procedure in IR-solid mixtures. Talanta 69, 822 (2006)
Ivanova, B.B., Simeonov, V.D., Arnaudov, M.G., Tsalev, D.L.: Linear-dichroic infrared spectroscopy—validation and experimental design of the new orientation technique of solid samples as suspension in nematic liquid crystal. Spectrochim. Acta 67A, 66 (2007)
Forest, M.G., Hong, Q., Zhou, Z.R.: Compare Couette versus Poiseuille flow. J. Rheol. 48, 175 (2004)
Poulin, P., Raghunathan, V.A., Richetti, P., Roux, D.: Colloidal inclusions in liquid crystals. J. Phys. II 4, 1557 (1994)
Andrienko, D., Tasinkevych, M., Dietrich, S.: Effective pair interactions between colloidal particles at a nematic-isotropic interface. Europhys. Lett. 70, 95 (2005)
West, J.L., Zhang, K., Glushchenko, A., Andrienko, D., Tasinkevych, M., Reznikov, Y.: Colloidal particles at a nematic-isotropic interface: effects of confinement. arXiv:cond-mat/0606169 v1 7 Jun 2006
Smalyukh, I.I., Lavrentovich, O.D., Kuzmin, A.N., Kachynski, A.V., Prasad, P.N.: Elasticity-mediated self-organization and colloidal interactions of solid spheres with tangential anchoring in a nematic liquid crystal. arXiv:cond-mat/0508331 v1 13 Aug 2005
Andrienko, D., Tasinkevych, M., Patrıcio, P., M.M. Telo da Gama. arXiv:cond-mat/0312203 v1 8 Dec 2003
Vollmer, D., Hinze, G., Poon, W.C.K., Cleaver, J., Cates, M.E.: The origin of network formation in colloidliquid crystal composites. J. Phys. Condens. Matter 16, L227 (2004)
Stark, H., Fukuda, J., Yokoyama, H.: Capillary condensation in liquid-crystal colloids. Phys. Rev. Lett. 92, 205502 (2004)
Kalyon, D.M., Yaras, P., Aral, B., Yilmazer, U.: Rheological behavior of concentrated suspensions: a solid rocket fuel stimulant. J. Rheol. 37, 35 (1993)
West, J.L., Glushchenko, A., Liao, G., Reznikov, Y., Andrienko, D., Allen, M.P.: Drag on particles in a nematic suspension by a moving nematic-isotropic interface. Phys. Rev. E 66, 012702 (2002)
Lubensky, T.C., Pettey, D., Currier, N., Stark, H.: Topological defects and interactions in nematic emulsions. Phys. Rev. E 57, 610 (1998)
Stark, H.: Director field configurations around a spherical particle in a nematic liquid crystal. Eur. Phys. J. B 10, 311 (1999)
Spanget-Larsen, J.: Infrared linear-dichroism spectroscopy of 1,8-dihydroxy-9,10-anthraquinone aligned in stretched polyethylene. SPIE 1575, 404 (1992)
Jordanov, B., Nentchovska, R., Schrader, B.: FT-IR linear dichroic solute spectra of nematic solutions as a tool for IR band assignment. J. Mol. Struct. 297. 401 (1993)
Jordanov, B., Schrader, B.: Reduced IR-LD spectra of substances oriented as nematic solutions. J. Mol. Struct. 347, 389 (1995)
Kolev, T., Glavcheva, Z., Yancheva, D., Schuermann, M., Kleb, D.-Chr., Preut, H., Bleckmann, P.: Triclinic form of 2-{5,5-dimethyl-3-[2-(2,4,6-trimethoxyphenyl)vinyl]cyclohex-2-enylidene}malononitrile. Acta Crystallogr. E57, o966 (2001)
Kolev, T., Glavcheva, Z., Yancheva, D., Schuermann, M., -Chr. Kleb, D., Preut, H., Bleckmann, P.: Monoclinic form of 2-{5,5-dimethyl-3-[2-(2,4,6-trimethoxyphenyl)vinyl]cyclohex-2-enylidene}malononitrile. Acta Crystallogr. E57, o964 (2001)
Kolev, T., Koleva, B.B., Spassov, T., Cherneva, E., Spiteller, M., Mayer-Figge, H., Sheldrick, W.S.: Synthesis, spectroscopic, thermal and structural elucidation of 5-amino-2-methoxypyridine ester amide of squaric acid ethyl ester: a new material with an infinite pseudo-layered structure and manifested NLO application. J. Mol. Struct. (2007, in press)
Haisa, M., Kashino, S., Maeda, H.: The orthorhombic form of p-hydroxyacetanilide. Acta Crystallogr. 30B, 2510 (1974)
Nichols, G., Frampton, C.S.: Physicochemical characterization of the orthorhombic polymorph of paracetamol crystallized from solution. J. Pharm. Sci. 87, 684 (1998)
Marsh, R.E.: A refinement of the crystal structure of glycine. Acta Crystallogr. 11, 654 (1958)
Legros, J.-P., Kvick, A.: Deformation electron density of α-glycine at 120 K. Acta Crystallogr. 36B, 3052 (1980)
Shimon, L.J.W., Lahav, M., Leiserowitz, L.: Stereoselective etchants for molecular crystals. Resolution of enantiomorphs and assignment of absolute structure of chiral molecules and polar crystals. New J. Chem. 10, 723 (1986)
Langan, P., Mason, S.A., Myles, D., Schoenborn, B.P.: Structural characterization of crystals of α-glycine during anomalous electrical behaviour. Acta Crystallogr. 58B, 728 (2002)
Boldyreva, E.V., Drebushchak, T.N., Shutova, E.S.: Structural distortion of the α, β, and γ polymorphs of glycine on cooling. Z. Kristallogr. 218, 366 (2003)
Benedetti, E., Pedone, C., Sirigu, A.: The crystal structure of DL-isoleucine and structural relations between racemic and optically active pairs in some amino acids. Acta Crystallogr. 29B, 730 (1973)
Ivanova, B.B.: Solid state linear-dichroic infrared spectral analysis of dipeptide l-Phe-l-Phe and its mononuclear Au(III)-complex. J. Coord. Chem. 58(7) 587 (2005)
Ivanova, B.B.: Solid state linear-dichroic infrared (IR-LD) spectral characterization of α- and β-polymorphs of glycine. Cent. Eur. J. Chem. 4, 111 (2006)
Acknowledgements
B. K. wishes to thank the Alexander von Humboldt Foundation for the Fellowship. T. K. shows appreciation to the Alexander von Humboldt Foundation and DD.
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Tabulated data of the dependence of the parameter Δ, as a function of the layer thickness, shearing velocity and particle size of the system studied as well as a function of the layer thickness, shearing velocity and particle size of the system studied.
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Koleva, B.B., Kolev, T.M., Simeonov, V. et al. Linearly polarized IR-spectroscopy of partially oriented solids as a colloid suspension in nematic host: a tool for spectroscopic and structural elucidation of the embedded chemicals. J Incl Phenom Macrocycl Chem 61, 319–333 (2008). https://doi.org/10.1007/s10847-008-9425-5
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DOI: https://doi.org/10.1007/s10847-008-9425-5