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Microstructural metrology of tobacco mosaic virus nanorods during radial compression and heating
Soft Matter ( IF 2.9 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7sm01332a C. Riekel 1, 2, 3, 4, 5 , M. Burghammer 1, 2, 3, 4, 5 , I. Snigirev 1, 2, 3, 4, 5 , M. Rosenthal 1, 2, 3, 4, 5
Soft Matter ( IF 2.9 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7sm01332a C. Riekel 1, 2, 3, 4, 5 , M. Burghammer 1, 2, 3, 4, 5 , I. Snigirev 1, 2, 3, 4, 5 , M. Rosenthal 1, 2, 3, 4, 5
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We determined stress-induced deformations and the thermal stability of nanorod-shaped tobacco mosaic virus (TMV) capsids in coffee-ring structures by X-ray nanodiffraction. The hexagonal capsids lattice transforms under compression in the outer boundary zone of the coffee-ring into a tetragonal lattice. The helical pitch of the nanorods increases by about 2.5% across the outer boundary zone while the lateral distance between nanorods decreases continuously across the whole coffee-ring structure by about 2% due to compressive forces. The diffraction patterns show a mixture of helical scattering and Bragg peaks attributed to a lattice of nanorods interlocked by their helical grooves. Thermo-nanodiffraction reveals water loss up to about 100 °C resulting in a reduction of the helical pitch by about 6% with respect to its maximum value and a reduction of the nanorods separation by about 0.5 nm. Up to about 200 °C the pitch is increasing again by about 2%. Secondary crystallization in the bulk reaches a maximum at 150–160 °C. At higher temperatures the crystallinity is continuously decreasing up to about 220 °C. Above about 200 °C and depending on the heating history, the nanorods start disintegrating into small, randomly oriented aggregates.
中文翻译：
径向压缩和加热过程中烟草花叶病毒纳米棒的微观结构计量
我们通过X射线纳米衍射确定了应力诱导的变形和咖啡环结构中的纳米棒状烟草花叶病毒（TMV）衣壳的热稳定性。六边形衣壳格子在咖啡环的外边界区域中在压缩下转变成四边形格子。纳米棒的螺旋间距在外边界区域上增加约2.5％，而纳米棒之间的横向距离由于压缩力而在整个咖啡环结构上连续减少约2％。衍射图显示出螺旋散射和布拉格峰的混合，这归因于纳米棒的晶格通过其螺旋槽互锁。热纳米衍射揭示了高达约100°C的水分流失，导致螺旋螺距相对于其最大值减少了约6％，纳米棒分离减少了约0.5 nm。在高达约200°C的温度下，螺距又增加了约2％。本体中的二次结晶在150–160°C时达到最大值。在较高的温度下，结晶度持续降低直至约220°C。高于约200°C，并取决于加热历史，纳米棒开始崩解成小的随机取向的聚集体。
更新日期：2017-11-15
中文翻译：
径向压缩和加热过程中烟草花叶病毒纳米棒的微观结构计量
我们通过X射线纳米衍射确定了应力诱导的变形和咖啡环结构中的纳米棒状烟草花叶病毒（TMV）衣壳的热稳定性。六边形衣壳格子在咖啡环的外边界区域中在压缩下转变成四边形格子。纳米棒的螺旋间距在外边界区域上增加约2.5％，而纳米棒之间的横向距离由于压缩力而在整个咖啡环结构上连续减少约2％。衍射图显示出螺旋散射和布拉格峰的混合，这归因于纳米棒的晶格通过其螺旋槽互锁。热纳米衍射揭示了高达约100°C的水分流失，导致螺旋螺距相对于其最大值减少了约6％，纳米棒分离减少了约0.5 nm。在高达约200°C的温度下，螺距又增加了约2％。本体中的二次结晶在150–160°C时达到最大值。在较高的温度下，结晶度持续降低直至约220°C。高于约200°C，并取决于加热历史，纳米棒开始崩解成小的随机取向的聚集体。
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