538-81-8 Purity
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The research demonstrated the creation of nano-encapsulated phase change materials (NEPCM) which utilize n-tetradecane oil as the phase change material (PCM) and urea-formaldehyde resin for the shell component. The nanocapsules can be used for thermal energy storage and enhanced heat transfer.
Preparation procedure of n-tetradecane-based NEPCM
· Urea-formaldehyde prepolymer synthesis: A mixture of 3 g urea, 10 ml H2O, and 14 g formaldehyde solution was prepared in a 100 ml flask. The pH was adjusted to 8-9 using triethanolamine. The mixture was stirred at 200 rpm and 70°C (water bath) for 1 h, yielding a prepolymer with C-N, N-H, and O-H groups.
· O/W emulsion preparation: SDS (0.5 g) was dissolved in 300 g H2O containing resorcinol and NaCl (variable ratios). The solution was heated to 60°C, mixed with 15 g n-tetradecane, and emulsified at 1500 rpm (60°C, 30 min) to form an o/w emulsion. Condensation (CH2OH and NH groups) initiated upon adjusting the emulsion pH to 3-4.
· Nanocapsule fabrication: The prepolymer was dripped into the emulsion under 200 rpm stirring. The pH was adjusted to 3-4 with 40% formic acid, maintaining 60°C. Stirring was increased to 500 rpm for 4 h to form a urea-formaldehyde shell encapsulating n-tetradecane. The nanocapsules were filtered, washed thrice with 70°C H2O, and vacuum-dried for 20 h.
In comparison to traditional single-phase heat transfer fluids like chilled water used in air conditioning, phase change emulsions significantly enhance apparent specific heat within their phase change temperature range. This advancement presents valuable opportunities for improving heat transfer, as well as thermal energy transport and storage.
Nanoemulsions of tetradecane in water have been successfully created using a blend of non-ionic surfactants (Tween60 and Span60). Various emulsification techniques were explored to achieve these nanoemulsions. The low-energy emulsification methods, such as the phase inversion temperature approach, highlighted the critical role of crossing the inversion line and the rate of that transition. By employing the most suitable method, emulsions were generated with a narrow droplet size distribution of 200 to 250 nm.
These emulsions demonstrated stability against sedimentation and creaming for over six months, along with low viscosity values ranging from 2 to 4 times that of water. However, Ostwald ripening led to slight droplet size growth and a decrease in viscosity.
Various property measurements and analyses showed promising results, with the possibility of increasing the apparent heat capacity. The table 4 summarized the optimal emulsification method alongside the properties of the developed nanoemulsion. Thermal analyses revealed promising characteristics for utilizing phase change nanoemulsions in thermal storage and transport applications.
The molecular formula of tetradecane is C14H30.
The molecular weight of tetradecane is 198.39 g/mol.
The IUPAC name of tetradecane is tetradecane.
The InChI of tetradecane is InChI=1S/C14H30/c1-3-5-7-9-11-13-14-12-10-8-6-4-2/h3-14H2,1-2H3.
The InChIKey of tetradecane is BGHCVCJVXZWKCC-UHFFFAOYSA-N.
The canonical SMILES of tetradecane is CCCCCCCCCCCCCC.
The CAS number of tetradecane is 629-59-4.
The XLogP3 value of tetradecane is 7.2.
Tetradecane has 11 rotatable bonds.
The topological polar surface area of tetradecane is 0Ų.