Phase Transitions of Naphthalene and Its Derivatives Confined in Mesoporous Silicas

Abstract

b S Supporting Information ' EXPERIMENTAL SECTION Spherical Mesoporous Silicas. Spherical mesopores with diameters ranging from 6.6 to 28.6 nm were prepared using three different synthesis procedures in order to access such sizes.

Study on preparation and thermal properties of sodium nitrate/silica composite as shape-stabilized phase change material

“…8 shows the FTIR spectra of NaNO 3 /SiO 2 composite treated at different roasting temperatures. The peak at 3465 cm À1 represented the OH groups in SiO 2 matrix, and these massive OH groups enabled the adsorption of NaNO 3 at the SiO 2 surface [31][32][33][34][35]. When the roasting temperature was lower than 500 C, with the increase of the roasting temperature, the peak at 3465 cm À1 became smaller.…”

The dependence of phase change enthalpy on the pore structure and interfacial groups in hydrated salts/silica composites via sol–gel

“…However, it should be noted that although the mesopores formed through sol-gel approach can effectively inhibit the leakage of the PCMs due to the capillary force, the phase change behavior of PCMs in mesopores is much more complicated and quite different from that of the bulk PCM. Numerous literatures [15][16][17][18] have reported the observed phase change temperature shift and enthalpy decrease in porous media. The changes are generally considered to result from the pore size distribution, geometrical shape of pore, network inter-connection of http://dx.doi.org/10.1016/j.jcis.2015.02.020 0021-9797/Ó 2015 Elsevier Inc. All rights reserved.…”

Metal–semiconductor transition like behavior of naphthalene-doped single wall carbon nanotube bundles

“…The melting points of DNN and DHN are 505 K and 551 K, respectively. Confinement of naphthalene (N), methylnaphthalene (MN), methoxynaphthalene (MeN) and chloronaphthalene (ClN) in the silicious mesopores of SBA-15 of 5.5 nm lowers their melting temperature by 65 K -85 K. 31 As the confinement of DNN and DHN in the interstices of the SWCNT bundles is much more intensive, the depression of the melting temperature should be more than that in SBA-15. The depression of the melting temperature of DNN inserted in the SWCNT bundles by 200 K predicts an anomaly in the temperature dependence of the electrical conductivity around T = 305 K (T -1 = 3.3 x 10 -3…”