Andrikopoulos Konstantinos S, Bounos Giannis, Lainioti Georgia Ch, Ioannides Theophilos, Kallitsis Joannis K, Voyiatzis George A
Foundation for Research and Technology-Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), GR-26504 Patras, Greece.
Department of Physics, University of Patras, GR-26504 Patras, Greece.
Nanomaterials (Basel). 2022 Jul 15;12(14):2433. doi: 10.3390/nano12142433.
In the current study, we propose a simple hydrothermal pathway to synthesize nano-structured Mg(OH) after application of thermal decomposition followed by hydration of commercial minerals based on hydromagnesite and huntite. The synthesis of nano-materials is performed without the use of any catalyst. The effect of decomposition temperature on the hydrothermal synthesis of Mg(OH) is extensively studied. It is shown that the morphology of resulting structures consists typically of particles ~200 nm in diameter and ~10 nm in thickness. Study of the structure at the molecular level designates the composition and supports the nano-sized characteristics of the produced materials. The associated thermal properties combined with the corresponding optical properties suggest that the material may be used as a flame retardant filler with enhanced transparency. In this concept, the flame retardancy of composite coatings containing the produced nano-sized Mg(OH) was examined in terms of limiting oxygen index (LOI), i.e., the minimum concentration of oxygen that just supports flaming combustion.
在当前研究中，我们提出了一种简单的水热途径，用于在对基于菱镁矿和白镁钙石的商业矿物进行热分解然后水合之后合成纳米结构的氢氧化镁。纳米材料的合成在不使用任何催化剂的情况下进行。广泛研究了分解温度对氢氧化镁水热合成的影响。结果表明，所得结构的形态通常由直径约200 nm、厚度约10 nm的颗粒组成。在分子水平上对结构的研究确定了组成并支持了所制备材料的纳米尺寸特性。相关的热性能与相应的光学性能表明，该材料可用作具有增强透明度的阻燃填料。在此概念下，通过极限氧指数（LOI），即刚好支持燃烧的最低氧气浓度，研究了含有所制备纳米级氢氧化镁的复合涂层的阻燃性。
