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首页> 外文期刊>Chemistry: A European journal >Unique Nanoscale Morphologies Underpinning Organic Gel-Phase Materials
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Unique Nanoscale Morphologies Underpinning Organic Gel-Phase Materials

机译：独特的纳米形态支撑有机凝胶相材料

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This study investigates the self-assembly of simple aliphatic dia-mines with a dendritic peptide.By controlling the molar ratio of this two-component system,new nanoscale morphologies were generated.In the presence of relatively long aliphatic chains (C10,C12) a transition from nanoscale fibres to platelets was observed on changing the molar ratio,whereas,for shorter spacer chains (e.g.,C9 and C8),interesting and unique morphological changes were observed by low voltage field emission gun scanning electron microscopy (SEM),with "nano-squares" or nanoscale "rosette" structures being formed.Remarkably,these discrete nanoscale structures were able to form sample-spanning networks capable of supporting a gel-phase material;whereas,most gels are usually based on fibrillar assemblies.In addition to SEM,the gels were characterised by using thermal measurements and circular dichroism spectroscopy.The length of the diamine spacer and the molar ratio of components controlled the self-assembly process by modifying the spatial organisation of the dendritic head groups at the molecular level,which is transcribed into the aspect ratio of the self-assembled state at the microscopic level.Ultimately,this led to diamine-induced control of the macroscopic material's behaviour.When present in excess,the diamine controlled the observed nanoscale morphology as a consequence of undergoing a dendritically controlled nanocrys-tallisation process to form a network,an unusual and significant result.
机译：这项研究研究了简单的脂肪族胺与树突状肽的自组装。通过控制该两组分系统的摩尔比，产生了新的纳米级形态。在相对长的脂肪族链（C10，C12）存在下，通过改变摩尔比，可以观察到从纳米级纤维到血小板的转变，而对于较短的间隔链（例如，C9和C8），通过低压场发射枪扫描电子显微镜（SEM）观察到有趣且独特的形态变化，值得注意的是，这些离散的纳米级结构能够形成能够支撑凝胶相材料的跨样品网络;而大多数凝胶通常基于原纤维组装体。扫描电镜，通过热测量和圆二色谱法对凝胶进行表征。二胺间隔基的长度和组分的摩尔比控制了自组装过程。通过在分子水平上修饰树突状头部基团的空间组织得以实现，这在微观水平上被转化为自组装态的长宽比。最终，这导致了二胺诱导的宏观材料行为的控制。由于过量地存在，二胺控制了观察到的纳米级形貌，这是由于经历了树状控制的纳米晶体层化过程以形成网络的结果，这是不寻常且显着的结果。

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