Self-Standing Polyelectrolyte Multilayer Films Based on Light-Triggered Disassembly of a Sacrificial Layer
Self-Standing Polyelectrolyte Multilayer Films Based on Light-Triggered Disassembly of a Sacrificial Layer
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DOI：
10.1021/nn203490q
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发表时间：
2011-11-01
期刊：
影响因子：
17.1
通讯作者：
Hong, Jong-Dal
中科院分区：
文献类型：
--
作者：
Pennakalathil, Jousheed;Hong, Jong-Dal
本文提出了一种制备自支撑多层膜的新方法。该方法采用了由五个聚（丙烯酸酯，mercury）PMC/聚（二烯丙基二甲基氯化铵）PDADMAC双层，这是由可见光照射触发的牺牲层地层的拆卸。这导致两性离子PMC转化为其中性异构体聚（丙烯酸酯，螺吡喃）PSP，从而相邻双层之间的吸引性离子相互作用消失。当采用UV/可见光谱法在PSP的最大吸光度（λ = 360 nm）下原位监测时，在去离子水中的牺牲层的分解在47 s内完成。令人惊讶的是，牺牲层的分解持续时间增加非常少，与由75个PDADMAC/PSS双层组成的上部目标膜。由100个（PDADMAC）/（PSS）双层组成的厚靶膜（d类似于232 nm）在大规模（7 × 18 mm（2））中的快速释放不仅可以归因于层对之间消失的静电吸引相互作用，而且可以归因于由于两性离子离子PMC光异构化为中性PSP而增加的牺牲层元件的疏水性。与传统方法相比，该方法的独特优点通过与良好限定的薄牺牲层（d类似于30 nm）相结合的自立膜的快速释放（类似于2 min）来证明。此外，还避免了苛刻的剥离条件，这显著拓宽了可掺入自支撑膜中的材料的选择。
In the present article, we present a new and convenient optical method for the preparation of self-standing polyelectrolyte multilayer films. This method employs the disassembly of a sacrificial layer stratum composed of five poly(acrylate, merocyanine) PMC/poly(diallyldimethylammonium chloride) PDADMAC bilayers, which is triggered by the irradiation with visible light. This leads to the conversion of the zwitterionic PMC to its neutral isomer poly(acrylate, spiropyran) PSP, whereby the attractive ionic interactions between the neighboring bilayers vanish. The disassembly of the sacrificial layers In deionized water was completed within 47 s, when in-situ monitored at the maximum absorbance of PSP (lambda = 360 nm), employing UV/visible spectrometry. Surprisingly, the disassembly duration of the sacrificial layers increased very little with an upper target film composed of 75 PDADMAC/PSS bilayers. The quick release of a thick target film (d similar to 232 nm) composed of 100 (PDADMAC)/(PSS) bilayers In a large scale (7 x 18 mm(2)) could be ascribed not only to the vanished electrostatic attractive interaction between the layer pairs but also to increased hydrophobicity of the sacrificial layer element due to the photoisomerization of zwitterionic ionic PMC to neutral PSP. The unique advantages of this method as compared to the conventional approaches are demonstrated with the fast release (similar to 2 min) of self-standing film combined with a well-defined, thin sacrificial layer (d similar to 30 nm). Moreover, harsh release conditions are also avoided, which significantly broadens the choice of materials that can be incorporated into the free-standing film.