Investigation of PCM Microcapsules with Paraffin Filling by Positron Lifetime Spectroscopy

• Authors: B. Zgardzińska
• Languages of publication: EN

Abstracts

EN

Positron annihilation lifetime spectroscopy was applied to investigate the microcapsules composed of n-eicosane (filling material) and polysiloxane polymer (shell) in the range of temperatures 123-333 K. Pure components of microcapsules were also investigated as a base for interpretation of the measurement results. The temperature of phase transitions in microcapsules was determined. It showed the appearance of a rotary phase, which is not present in pure n-eicosane. In the considered material, two types of free volume have been identified. The sizes of free volumes able to accommodate Ps were estimated using standard models. On the basis of the o-Ps intensities, the content of polysiloxane in microcapsules was estimated as about 40%. Internal structure of the microcapsules (morphology) was observed by scanning electron microscopy.

Keywords

EN

78.70.Bj; 62.23.Pq; 61.80.Fe; 61.72.-y; 61.46.-w; 81.07.Nb; 64.70.Nd; 82.35.Pq

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 82.35.Pq: Biopolymers, biopolymerization(see also 87.15.rp Polymerization in biological and medical physics)
• 64.70.Nd: Structural transitions in nanoscale materials
• 62.23.Pq: Composites (nanosystems embedded in a larger structure)
• 61.46.-w: Structure of nanoscale materials(for thermal properties of nanocrystals and nanotubes, see 65.80.-g; for mechanical properties of nanoscale systems, see 62.25.-g; for electronic transport in nanoscale materials, see 73.63.-b; see also 62.23.-c Structural classes of nanoscale systems; 64.70.Nd Structural transitions in nanoscale materials; for magnetic properties of nanostructures, see 75.75.-c)
• 61.72.-y: Defects and impurities in crystals; microstructure(for radiation induced defects, see 61.80.-x; for defects in surfaces, interfaces, and thin films, see 68.35.Dv and 68.55.Ln; see also 85.40.Ry Impurity doping, diffusion, and ion implantation technology; for effects of crystal defects and doping on superconducting transition temperature, see 74.62.Dh)
• 61.80.Fe: Electron and positron radiation effects
• 81.07.Nb: Molecular nanostructures

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 5
• Pages: 1536-1539

Dates

published

2015-05

Contributors

author

B. Zgardzińska

• Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

References

• [1] S.J. Tao, J. Chem. Phys. 56, 5499 (1972), doi: 10.1063/1.1677067
• [2] M. Eldrup, D. Lightbody, J.N. Sherwood, Chem. Phys. 63, 51 (1981), doi: 10.1016/0301-0104(81)80307-2
• [3] B. Jasińska, A.E. Kozioł, T. Goworek, J. Radioanal. Chem. 210, 617 (1996), doi: 10.1007/BF02056403
• [4] B. Zgardzińska, Acta Phys. Pol. A 125, 700 (2014), doi: 10.12693/APhysPolA.125.700
• [5] T. Goworek, K. Ciesielski, B. Jasińska, J. Wawryszczuk, Chem. Phys. Lett. 272, 91 (1997), doi: 10.1016/S0009-2614(97)00504-6
• [6] K. Pielichowska, K. Pielichowski, Prog. Mater. Sci. 65, 67 (2014), doi: 10.1016/j.pmatsci.2014.03.005
• [7] M. Maroncelli, H.L. Strauss, R.G. Snyder, J. Chem. Phys. 82, 2811 (1985), doi: 10.1063/1.448280
• [8] A. Genovese, G. Amarasinghe, M. Glewis, D. Mainwaring, R.A. Shanks, Thermochim. Acta 443, 235 (2006), doi: 10.1016/j.tca.2006.02.008
• [9] M. Maroncelli, S.P. Qi, H.L. Strauss, R.G. Snyder, J. Am. Chem. Soc. 104, 6237 (1982), doi: 10.1021/ja00387a013
• [10] W. Fortuniak, S. Slomkowski, J. Chojnowski, J. Kurjata, A. Tracz, U. Mizerska, Colloid Polym. Sci. 291, 725 (2013), doi: 10.1007/s00396-012-2782-z
• [11] J. Kansy, Nucl. Instrum. Methods Phys. Res. A 374, 235 (1996), doi: 10.1016/0168-9002(96)00075-7
• [12] A. Ekstrom, R. Suenram, J.E. Willard, J. Phys. Chem. 74, 1888 (1970), doi: 10.1021/j100704a011
• [13] Y. Ito, T. Hirade, E. Hamada, T. Suzuki, Y. Ito, Acta Phys. Pol. A 95, 533 (1999)
• [14] M. Pietrow, B. Zgardzińska, Acta Phys. Pol. A 110, 641 (2006)
• [15] B. Zgardzińska, T. Goworek, Chem. Phys. Lett. 547, 35 (2012), doi: 10.1016/j.cplett.2012.08.003

Identifiers

DOI

10.12693/APhysPolA.127.1536