表面活性剂PEG的加入，样品的六方结构有序性和孔尺寸发生变化。
When polymer PEG was added, the mesoporous structure of samples including hexagonal order and the pore size changed.
采用第一性原理研究了B2CN晶体可能的六方结构和异质金刚石结构；
The possible B2CN crystal structures with hexagonal and heterodiamond structures were studied by first principles calculation.
研究表明：在低表面活性剂下，经分子自组装可形成排列有序的六方结构。
Studies show that a much lower surfactant can be used to produce mesoporous silica through molecular self assemble.
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