Super molecular liquid – crystallised state transition
Principle of phenomenon
Highly concentrated water liquid system of sodium acetate (approximately 10 w/w % water) with relatively low viscosity (10, mPa.s) is transited at room temperature to crystallised state by contact with microcrystal of this one. The process is full reversible accompanied by release of heat. Heating of whole system at 60oC and careful cooling the liquid state is obtained again.
This phenomenon demonstrates a typical behaviour of low molecular systems consisting of molecules substance A, e.g. sodium acetate, homogeneously distributed only in immobilised water. No bulky water is presented, i.e. the individual molecules of A are mutually separated by water molecules penetrating homogeneously the whole system and preventing them to collide finished by their crystallisation. According to SCHL theory (see also “Experimental modelling system of hydration forces”), this behaviour is possible due to prevailing repulsive hydration forces because equal orientation of water molecules at interfaces around molecules of substance A. Due to weak prevailing hydration repulsive forces, contacting this liquid system with microcrystal of substance A the process of reorientation of molecules A into more stabile more oriented crystalline state is triggered accompanied by heat releasing because the entropy of system decreases. The process takes place step by step by “domino” mechanism through the whole system. With increasing of water concentration the system is also more stable, with lower viscosity and fast expatiation of crystallization.
Schematically representation of molecular heat accumulator.
back to SCHL theory