Abstract
An experimental investigation was made of microencapsulation of titanium dioxide nanoparticles in PEG 8000 polyethylene glycol by pulsed expansion of a jet of a polymer solution in supercritical carbon dioxide into either a vacuum or a background gas (helium). In both cases, at a given initial temperature in the mixing reactor and a given cosolvent concentration, an electron microscopic study was carried out to determine the distance from the nozzle exit to the point in the jet axis in the vicinity of which the coil–globule transition was detected. The dependence of the position of the transition point on the initial temperature and the cosolvent (ethanol) concentration was characterized.
Similar content being viewed by others
References
S. Benita, Microencapsulation: Methods and Industrial Applications (Marcel Dekker, New York, 1996).
V. M. Solodovnik, Microcapsulation (Khimiya, Moscow, 1980) [in Russian].
K. A. Tatarenko and A. V. Lazarev, Russ. J. Phys. Chem. B 10, 1171 (2016).
A. V. Lazarev, K. A. Tatarenko, and P. A. Tatarenko, Sverkhkrit. Fluidy Teor. Prakt. 12 (4), 3 (2017).
K. Matsuyama, K. Mishima, K. Hayashi, and H. Matsuyama, J. Nanopart. Res. 5, 87 (2003).
M. H. Xu and N. P. Huang, Supramol. Sci. 5, 449 (1998).
E. A. Rozhkova, I. Ulasov, B. Lai, N. M. Dimitrijevic, M. S. Lesniak, and T. Rajh, Nano Lett. 9, 3337 (2009).
A. Harada, M. Ono, E. Yuba, and K. Kono, Biomater. Sci., No. 1, 65 (2013).
S. Wu, Zh. Weng, X. Liu, K. W. K. Yeung, and P. K. Chu, Adv. Funct. Mater. 24, 5464 (2014).
O. Redlich and J. N. S. Kwong, Chem. Rev. 44, 233 (1949).
S. F. Chekmarev, Pulsed Gas Flow in Supersonic Nozzles and Jets (Inst. Teplofiz. AN SSSR, Novosibirsk, 1989), p. 236 [in Russian].
H. Ashkenas and C. K. Sherman, in Proceedings of the 4th Symposium on Rarefied Gas Dynamics, 1966, Vol. 2, p. 84.
Ya. B. Zel’dovich and Yu. P. Raizer, Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena (Fizmatlit, Moscow, 2008; Academic, New York, 1966, 1967).
K. L. Saenger, J. Chem. Phys. 75, 2467 (1981).
H. W. Liepmann and A. Roshko, Elements of Gasdynamics (Dover, New York, 2002), Par. 3.2.
N. Georgi, Yu. Budkov, G. Chuev, I. Vyalov, M. Kiselev, and A. Kolesnikov, Preprint No. 49 (Max-Planck-Inst. Math. Naturwissensch., Leipzig, 2014), p. 1.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © K.A. Tatarenko, P.A. Tatarenko, S.A. Chernyak, A.V. Lazarev, 2018, published in Sverkhkriticheskie Flyuidy. Teoriya i Praktika, 2018, Vol. 13, No. 1, pp. 77–85.
Rights and permissions
About this article
Cite this article
Tatarenko, K.A., Tatarenko, P.A., Chernyak, S.A. et al. The Coil–Globule Transition in Microencapsulation of TiO2 Nanoparticles in a Supercritical CO2 Jet. Russ. J. Phys. Chem. B 12, 1249–1254 (2018). https://doi.org/10.1134/S1990793118080122
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1990793118080122