Multiscale structure of the underwater adhesive of Phragmatopoma californica:: A nanostructured latex with a steep microporosity gradient
Multiscale structure of the underwater adhesive of Phragmatopoma californica:: A nanostructured latex with a steep microporosity gradient
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DOI：
10.1021/la063765e
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发表时间：
2007-04-24
期刊：
影响因子：
3.9
通讯作者：
Stewart, Russell J.
中科院分区：
文献类型：
--
作者：
Stevens, Mark J.;Steren, Rebekah E.;Stewart, Russell J.
加州芦苇通过在水下用蛋白质粘合剂将沙子和贝壳粘合在一起来建造管状住宅。在实验室中，动物将使用 0.5 毫米的玻璃珠进行建造。将两点体积一致的胶水（每点约 100 pL）沉积在玻璃珠上，然后将其放置在管的末端。动物在松开之前将颗粒扭动 20-30 秒，这表明粘合剂在 30 秒内就充分凝固以支撑玻璃珠。使用激光扫描共焦和原子力显微镜在微米和纳米长度尺度上检查粘合接头的结构。在微观尺度上，粘合剂是一种蜂窝状固体，其孔径范围为 0.5 至 6.0 μm，其分布形成陡峭的孔隙率梯度，其范围从外边缘的接近零到粘合接头中心的约 50%。在纳米尺度上，粘合剂似乎是数万亿个可变形纳米球的堆积体，让人想起高固体含量的乳胶粘合剂。讨论了结构对粘合剂功能的影响。
Phragmatopoma Californica builds a tubular dwelling by gluing bits of sand and seashell together underwater with a proteinaceous adhesive. In the lab, the animals will build with 0.5 mm glass beads. Two spots of glue with a consistent volume of about 100 pL each are deposited on the glass beads before placement on the end of the tube. The animals wriggled the particles for 20-30 s before letting go, which suggested that the adhesive was sufficiently set within 30 s to support the glass beads. The structure of the adhesive joints was examined at the micro- and nanoscopic length scales using laser scanning confocal and atomic force microscopies. At the microscale, the adhesive was a cellular solid with cell diameters ranging from 0.5 to 6.0 mu m, distributed to create a steep porosity gradient that ranged from near zero at the outside edges to about 50% at the center of the adhesive joint. At the nanoscale, the adhesive appeared to be an accretion of trillions of deformable nanospheres, reminiscent of a high-solids-content latex adhesive. The implications of the structure for the functionality of the adhesive is discussed.