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Preparation of tris(hydroxymethyl)aminomethane (77-86-1) composite phase change material

2017-12-21 来源:亚科官网
21 December 2017
  As a common bio-buffer, Tris or THAM is not only widely used as a nucleic acid and protein solvent, one of the main components of protein electrophoresis buffer, but also can produce a variety of chemicals, pesticides, medical products, it is also an important intermediate for the preparation of surfactants, vulcanization accelerators and some drugs. In addition, it can also be used to prepare composite phase change materials.
  Phase change material refers to the material that changes its state with temperature and provides latent heat. When the physical state changes, the temperature of the material itself remains almost unchanged before the phase change is completed, forming a wide temperature platform, but the latent heat absorbed or released is quite large. Trimethylamidomethane is a kind of heat storage material with excellent heat storage performance, with large latent heat value and good application performance. However, when it is heated to solid-solid phase transition temperature or above, it will change from crystalline solid to plastic crystal, with high solid vapor pressure, volatile loss, poor stability, high cost and high equipment requirements. All these shortcomings need to be overcomed before applying to the actual production and life.
  The researchers [1] using solution dipping method, the tris can be filled into porous silica with a pore size ranging from 15~100nm and a porous glass with a pore size ranging from 12~100nm to prepare a composite energy storage material. The specific preparation method is as follows:
(1) Determine the mass ratio according to the filling rate and the pore volume of the pore material, weigh and mix the materials in the glass tube;
(2) dropping 4 times (mass ratio) deionized water as a solvent, water bath at 363K to dissolve;
(3) water bath to volatilize the solvent, and stirring to maintain the uniformity of the solution;
(4) until the solvent is completely evaporated, solute will be completely left in the pores to achieve the effect of filling.
  The morphologies and heat storage properties of the obtained composites were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and differential scanning calorimetry (DSC), respectively. The space constraints of nano-dimensional affected the heat storage properties of THAM, making the composite phase change material phase transition temperature, phase transition latent heat, supercooling, thermal cycling performance have been significantly improved.
  Phase change materials have shown a broad application prospects in the solar energy utilization, electronic devices, health care products, aerospace and aerospace equipment, building energy efficiency and other aspects. The modified composite material solves the problems existing in the use of tris-hydroxymethyl-aminomethane alone, improves the application performance of conventional phase-change materials, and provides the composite phase-change material with wider temperature control range and more accurate thermal storage ability and more sensitive temperature response, making it become possible in the application in the real life.
References
[1] ZHAI Min. Studies on thermodynamic properties of tris-hydroxymethyl-aminomethane and several polycrystalline drug/porous materials composites. Shandong Agricultural University, June 2017.
Edited by Suzhou Yacoo Science Co., Ltd.