Cuenot S, Alem H, Louarn G, Demoustier-Champagne S, Jonas A M
Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, Nantes, France.
Eur Phys J E Soft Matter. 2008 Apr;25(4):343-8. doi: 10.1140/epje/i2007-10291-3. Epub 2008 Apr 11.
The elastic properties of nanotubes fabricated by layer-by-layer (LbL) assembly of polyelectrolytes in the nanopores of polycarbonate track-etched membranes have been investigated by resonant contact Atomic Force Microscopy (AFM), for nanotube diameters in the range of 100 to 200 nm. The elastic modulus of the nanotubes was computed from the resonance frequencies of a cantilever resting on freely suspended LbL nanotubes. An average value of 115 MPa was found in air for Young's modulus of these nanostructures, well below the values reported for dry, flat multilayers, but in the range of values reported for water-swollen flat multilayers. These low values are most probably due to the lower degree of ionic cross-linking of LbL nanotubes and their consequently higher water content in air, resulting from the peculiar mode of growth of nanoconfined polyelectrolyte multilayers.
通过共振接触原子力显微镜（AFM）研究了在聚碳酸酯径迹蚀刻膜的纳米孔中通过逐层（LbL）组装聚电解质制备的纳米管的弹性特性，纳米管直径范围为100至200纳米。纳米管的弹性模量是根据置于自由悬浮的LbL纳米管上的悬臂的共振频率计算得出的。在空气中，这些纳米结构的杨氏模量平均值为115兆帕，远低于干燥、平整多层膜报道的值，但在水溶胀平整多层膜报道的值范围内。这些低值很可能是由于LbL纳米管的离子交联程度较低，以及由于纳米受限聚电解质多层膜的特殊生长模式导致其在空气中含水量较高。
