Reversible adhesive-free nanoscale adhesion utilizing oppositely charged polyelectrolyte brushes
Reversible adhesive-free nanoscale adhesion utilizing oppositely charged polyelectrolyte brushes
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利用带相反电荷的聚电解质刷实现可逆的无粘合剂纳米级粘合
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Takahara
中科院分区：
文献类型：
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作者：
M. Kobayashi;Masami Terada;A. Takahara
将制备的两种含正、负离子聚电解质刷的硅片分别与2μ的L水在0.098 Mpa压力下于室温下连接。固定粘结面积为5×10 mm~2。由于带正负电荷的聚合物之间的静电吸引作用，聚[2-(甲基丙烯酰氧基)乙基三甲基氯化铵]和聚(3-磺丙基甲基丙烯酸钾盐)刷基板的粘接剪切强度达到1.52 Mpa。相比之下，具有相同电荷的粘结聚合物电刷的搭接剪切强度仅为0.027-0.072 Mpa。即使在搭接剪切试验中分离后，聚电解质刷子仍留在基材上；刷子基板在存在少量水的情况下重新粘合。此外，由于水合盐离子的静电相互作用，附着的底物在氯化钠水溶液中顺利脱粘。然而，底物在去离子水中不能分离。综上所述，利用带相反电荷的聚电解质刷与水溶液相结合，实现了可逆的纳米级粘附性。
Two prepared silicon wafers bearing cationic and anionic polyelectrolyte brushes were joined with 2 μL of water under 0.098 MPa of pressure at room temperature. The bonded area was fixed at 5 × 10 mm2. A lap shear strength of 1.52 MPa was achieved through the adhesion of poly[2-(methacryloyloxy)ethyl trimethylammonium chloride] and poly(3-sulfopropyl methacrylate potassium salt) brush substrates due to electrostatic attractive interactions between the positively and negatively charged polymers. In contrast, the lap shear strength of bonded polymer brushes with like charges was only 0.027–0.072 MPa. The polyelectrolyte brushes remained on the substrates even after their separation in the lap shear test; and the brush substrates readhered in the presence of a small amount of water. Furthermore, the adhering substrates were smoothly debonded in aqueous NaCl solution due to the electrostatic interaction of the hydrated salt ions. However, the substrates did not separate in deionized water. In summary, reversible nanoscale adhesion was achieved using oppositely charged polyelectrolyte brushes combined with aqueous solution.