Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM.
Growth behaviour and mechanical properties of PLL/HA multilayer films studied by AFM.
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DOI：
10.3762/bjnano.3.87
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发表时间：
2012
影响因子：
3.1
通讯作者：
von Klitzing R
中科院分区：
文献类型：
--
作者：
Uzüm C;Hellwig J;Madaboosi N;Volodkin D;von Klitzing R
用扫描原子力显微镜和胶体探针原子力显微镜研究了聚L赖氨酸/透明质酸(PLL/HA)n薄膜的力学性能与压痕速度和聚合物沉积步数n的关系。指出了这两种方法的优缺点，并讨论了弹性测量中的误差最小化技术。结果表明，薄膜厚度随着双层数n的增加而线性增加，当n=12和n=96时，薄膜厚度分别在400~7500 nm之间变化。表观杨氏模数E在15~40kPa之间变化，与压头尺寸或薄膜双层数n无关。应力松弛测量表明，PLL/HA薄膜具有粘弹性行为，无论其厚度如何。如果在薄膜的同一横向位置进行多次压痕，则会发生粘性/塑性变形。
Scanning- and colloidal-probe atomic force microscopy were used to study the mechanical properties of poly(L-lysine)/hyaluronan (PLL/HA)n films as a function of indentation velocity and the number of polymer deposition steps n. The film thickness was determined by two independent AFM-based methods: scratch-and-scan and newly developed full-indentation. The advantages and disadvantages of both methods are highlighted, and error minimization techniques in elasticity measurements are addressed. It was found that the film thickness increases linearly with the bilayer number n, ranging between 400 and 7500 nm for n = 12 and 96, respectively. The apparent Young’s modulus E ranges between 15 and 40 kPa and does not depend on the indenter size or the film bilayer number n. Stress relaxation measurements show that PLL/HA films have a viscoelastic behaviour, regardless of their thickness. If indentation is performed several times at the same lateral position on the film, a viscous/plastic deformation takes place.
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影响因子：
2.4
作者：
Mathur, AB;Collinsworth, AM;Truskey, GA
通讯作者：
Truskey, GA
影响因子：
1.9
作者：
Engler, AJ;Richert, L;Discher, DE
通讯作者：
Discher, DE
影响因子：
3.3
作者：
Lavalle, P;Picart, C;Schaaf, P
通讯作者：
Schaaf, P
影响因子：
3.4
作者：
Lo, CM;Wang, HB;Wang, YL
通讯作者：
Wang, YL
影响因子：
2.1
作者：
DECHER, G;HONG, JD;SCHMITT, J
通讯作者：
SCHMITT, J