摘要
利用烷基硫酸钠作为模板剂在室温下合成了层状中孔结构氧化铝，考察了表面活性剂碳链长度和表面活性剂混合比例对层状氧化铝中孔相结构参数的影响．当使用单一表面活性剂作为模板剂时，层状中孔结构氧化铝的层间距ｄ及其层状结构的长程有序度随着表面活性剂碳链长度的增加而增加；若使用Ｃ８Ｈ１７ＳＯ４Ｎａ与Ｃ１４Ｈ２９ＳＯ４Ｎａ混合表面活性剂作为混合模板剂，当Ｃ１４Ｈ２９ＳＯ４Ｎａ摩尔分数ｘ处在０～０．５时，层间距基本恒定，接近于具有二者平均碳链长度（ｎ＝１１）的单一表面活性剂作为模板剂时的情形；当ｘ＞０．５时，层间距随ｘ的增大而逐渐增大．
Lamellar mesostructured alumina was synthesized at room temperature by using
alkyl sulfates as templates. The effects of the length of the surfactant alkyl chain and the ratio of
mixed surfactants on the structural data of the obtained lamellar mesophases were
investigated. It was revealed that when single surfactants were used as templates, the
interlayer spacing(d) as well as the long\|range order of the lamellar structure increases with
increasing alkyl chain length. When the carbon number(n) of the alkyl chains varies from 8 to
12, the plot of d versus n is linear with a slope of 0.205 nm/carbon atom, which indicates that for
\{n=8￣12\}, the thickness of the inorganic layers keeps nearly constant and the alkyl chains
are arranged as double layers between the inorganic layers with a tilt angle of ca. 53. If mixed
surfactants C\-8H\-\{17\}SO\-4Na\|C\-\{14\}H\-\{29\}SO\-4Na are used as mixed templates, when
the molar fraction(x) of C\-\{14\}H\-\{29\}SO\-4Na varies in the range of 0<x0\^5, the int erlayer
spacing remains essentially unchanged and approximates to the case of using a single
surfactant with an average carbon number of 11 as template. On the other hand, when x>0\^5,
the interlayer spacing increases gradually with x. This result has been interpreted in terms of a
proposed structure model for the molecular arrangement of mixed surfactants between the
inorganic layers.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第4期507-510,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
国家攀登计划资助
关键词
超分子模板
层状
氧化铝
表面活性剂
中孔材料
Supramolecular templates, Lamellar mesostructured alumina, Mixed
surfactants
