Dilational Properties of Novel Amphiphilic Dendrimers at Water-Air and Water-Heptane Interfaces

doi:10.1021/jp305619n

CORC > 化学研究所 > 中国科学院化学研究所

	Dilational Properties of Novel Amphiphilic Dendrimers at Water-Air and Water-Heptane Interfaces
	Zhang, Pei 1; Zhang, Lei 2; Zhang, Lu 2; Zhou, Jizhu 1; Wang, Jinben 1; Yan, Haike 1
刊名	JOURNAL OF PHYSICAL CHEMISTRY B
	2012-10-25
卷号	116 期号:42 页码:12760-12768
ISSN号	1520-6106
DOI	10.1021/jp305619n
英文摘要	In this work, a series of novel amphiphilic dendrimers taking polyamidoamine dendrimer as the core with different hydrophobic tails QPAMC(m) were synthesized and the dilational properties were studied as monolayers by dilational rheological measurements at the water-air and water-n-heptane interfaces to explore the nature of adsorption go behaviors. The results showed that the maximum values of the dilational modulus seemed to have no obvious variation in a wide change of hydrophobic chain length at the surface. However, there was considerable variability in the tendency of the influence of bulk concentration on the dilational modulus at the two different interfaces. It was interestingly found that the diffusion-exchange process slowed down with the increase of alkyl chain length leading to more elastic nature of adsorption film, which was contrary to the tendencies of conventional single chain and gemini surfactants. It is reasonable to consider that, in the case of the molecule having short chain length such as QPAMC(8), the alkyl chains are too short to overlap across the headgroup, enable the intermolecular hydrophobic interaction to be predominant with increasing of surface concentration, which enhances the elasticity and shows the slowest diffusion-exchange process. Whereas, when the chain length increases to 12 or 16, the alkyl chains are long enough to act intramolecularly to form intracohesion conformation, which results in enhancing the diffusion-exchange process. In conclusion, the interfacial behaviors are dictated by the size ratio between the tail and headgroup. A reasonable model with respect to the molecular interaction was proposed on the basis of experimental data. The results of interfacial tension relaxation and dynamic light scattering (DLS) experiments, in accord with the proposed mechanism, also present the unusual tendency comparing to the traditional single or gemini surfactants.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000310120900014
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/49013]
专题	中国科学院化学研究所
通讯作者	Wang, Jinben
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Colloid Interface & Chem Thermodynam, Inst Chem, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Pei,Zhang, Lei,Zhang, Lu,et al. Dilational Properties of Novel Amphiphilic Dendrimers at Water-Air and Water-Heptane Interfaces[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2012,116(42):12760-12768.
APA	Zhang, Pei,Zhang, Lei,Zhang, Lu,Zhou, Jizhu,Wang, Jinben,&Yan, Haike.(2012).Dilational Properties of Novel Amphiphilic Dendrimers at Water-Air and Water-Heptane Interfaces.JOURNAL OF PHYSICAL CHEMISTRY B,116(42),12760-12768.
MLA	Zhang, Pei,et al."Dilational Properties of Novel Amphiphilic Dendrimers at Water-Air and Water-Heptane Interfaces".JOURNAL OF PHYSICAL CHEMISTRY B 116.42(2012):12760-12768.