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题名: Second harmonic generation as a probe of multisite adsorption at solid-liquid interfaces of aqueous colloid suspensions
作者: Campen, R. Kramer;  Zheng, De-Sheng;  Wang, Hong-Fei;  Borguet, Eric
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2007-06-28
DOI: 10.1021/jp061730h
卷: 111, 期:25, 页:8805-8813
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Chemistry at the surface of solid particles in colloidal dispersions is important in the description of such diverse topics as nutrient and contaminant flow in the environment and the creation of better paints and cosmetics. Particles in these systems are often characterized by molecular-level, surface heterogeneity. This molecular heterogeneity influences many aspects of the chemical processes of interest, among the simplest of which is physisorption. In this study we construct adsorption isotherms for the triphenylmethane dye Malachite Green on various latex particles using the flow through Second Harmonic Generation (ftSHG) technique. This technique makes it possible to construct significantly higher resolution isotherms than conventional separation methods. Here we chose both particles that we expect to be chemically homogeneous (plain polystyrene) and particles whose surface we expect to have molecular level heterogeneity (carboxylated and hydroxylated polystyrene). We find that, using the ftSHG isotherms, we are able to quantify the adsorption energies and site densities of multiple adsorption sites on the carboxylated and hydroxylated polystyrene particles but find only a single type of adsorption site on the plain polystyrene. We expect the ability to measure adsorption site energy and density on chemically heterogeneous latex colloids will be useful in the creation of better biosensors and that the application of ftSHG to other chemically heterogeneous colloids should provide insight into a variety of natural and engineered processes.
关键词[WOS]: ORIENTATION-INSENSITIVE METHODOLOGY ;  SPHERICAL POLYELECTROLYTE BRUSHES ;  SURFACE COMPLEXATION MODEL ;  ATOMIC-FORCE MICROSCOPY ;  NONLINEAR-OPTICAL PROBE ;  POLYSTYRENE MICROSPHERES ;  REFRACTIVE-INDEX ;  PARTICLES ;  WATER ;  SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000247601900012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140670
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Temple Univ, Dept Chem, Philadelphia, PA 19122 USA
2.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA
3.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100080, Peoples R China

Recommended Citation:
Campen, R. Kramer,Zheng, De-Sheng,Wang, Hong-Fei,et al. Second harmonic generation as a probe of multisite adsorption at solid-liquid interfaces of aqueous colloid suspensions[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2007,111(25):8805-8813.
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