Table of Content

23 September 2011, Volume 29 Issue 5

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Fluorescent Chemodosimeters for Mercury(Ⅱ) Ions Detection

HUANG Wen-jun, WU Wen-hui

2011, 29(5):  321-335.  DOI: 10.7517/j.issn.1674-0475.2011.05.321

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The development of fluorescent chemodosimeters has recently emerged as an active research area of significant importance.Chemodosimeters are used to detect an analyte through a highly selective and usually irreversible chemical reaction between the dosimeter molecule and the target analyte with high sensitivity and rapid response.Herein,we reviewed the literatures of the last few years covering the chemodosimetric approach for detecting mercury(Ⅱ) ions.

Study on the Protein Diffusion Behavior in the Poly(Acrylamide-co-Acrylic Acid) Copolymer by FRAP Technique

CUI Jin-lei, ZHOU Wen-wen, QIU Yu-qin, GAO Yun-hua

2011, 29(5):  336-343.  DOI: 10.7517/j.issn.1674-0475.2011.05.336

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The drug release behavior from the carrier is bound up with the carrier’s structure.In this paper,a series of poly(acrylamide-co-acrylic acid) hydrogels with different acrylamide/acrylic acid ratios have been successfully synthesized by aqueous polymerization.These co-polymers were characterized with FTIR technique to confirm the co-polymer formation.Fluorescence recovery after photobleaching(FRAP) technique was used to investigate the diffusion behavior of fluorescein isothiocyanate labelled bovine serum albumin(FITC-BSA) in these co-polymer hydrogels,and a confocal laser scanning microscopy was applied to obtain high resolution images in real time.The results showed that the diffusion coefficient of FITC-BSA was influenced by the ratio between the acrylamide and acrylic acid in co-polymer and the co-polymer hydrogels synthesized may have potential application in controlled protein delivery system.

Synthesis and Optical Properties of Novel Long Wavelength Florescent Dyes Based on Naphthalene Diimide

LU Xin-yu, LIU Hong-wei, ZHU Wei-hong

2011, 29(5):  344-352.  DOI: 10.7517/j.issn.1674-0475.2011.05.344

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Eight highly colored and photoluminescent mono-or di-core-substituted naphthalene diimide(NDIs) have been rationally designed and synthesized from 2,6-dibromonaphthalene diimide(DBI) via a stepwise nucleophilic substitution of two bromine atoms by heterocyclic secondary amine.Electronic absorption and fluorescence studies revealed that the amine substituents with different electron-donating abilities can lead to the NDIs with tunable absorption and emission properties,falling in the preferable region to long wavelength(λ_max^abs: 509—580 nm;λ_max^em: 565—638 nm;Φ_F: 0.21—0.54;Stokes shift: 36—77 nm).

Preparation of Gold-Modified Nitrogen-Doped TiO₂ and Its Visible Light Photocatalytic Activity

JING Ming-jun, WANG Yan, ZHANG Min, YANG Jian-jun

2011, 29(5):  353-363.  DOI: 10.7517/j.issn.1674-0475.2011.05.353

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N-doped TiO₂ was obtained from nanotube titanic acid and aqueous ammonia by hydrothermal method,and then gold-modified N-doped TiO₂ was prepared using deposition-precipitation method to deposit Au on the surface of N-doped TiO₂.The physicochemical properties of resultant N-doped or Au/N-doped TiO₂ samples were investigated by means of transmission electron microscopic(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),diffuse reflectance spectra(DRS),and electron spin resonance(ESR).The photocatalytic activity was evaluated by monitoring oxidation of propylene under visible light irradiation.Results indicated that N-TiO₂ and Au/N-TiO₂ showed obviously the visible light(λ≥420 nm) photocatalytic activity.The visible light sensitization was ascribed to the formation of single-electron-trapped oxygen vacancies.

A Fluorescent Sensor with a Large Stoke’s Shift

XU Xiao-he, Phadungsak Phongphonkit, JI Hai-feng

2011, 29(5):  364-371.  DOI: 10.7517/j.issn.1674-0475.2011.05.364

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Monitoring multiple physiological parameters by using the fluorescence method requires the loading of several distinct fluorescent probes which are excitable at the same fixed wavelength with well-separated emissions.Most current fluorescent probes only have small Stoke’s shift(50-90 nm),which limits their application in detecting multiple species simultaneously.In this work,we report a molecular probe based on a new design of receptor-Fluorophore-1-Spacer-Fluorophore-2(RFSF).The RFSF probe has a large Stoke’s shift,which is complementary to the traditional probes in detecting dual species.In this molecule,the fluorophore 1 is naphthalene and the fluorophore 2 is anthracene and the molecule can be used to detect proton.In the absence of proton,when the naphthalene is excited at 280 nm,a weak emission at 420 nm from anthracene due to energy transfer is observed.The Stoke’s shift was 140 nm,which was much greater than general fluorescent sensors with a single fluorophore,such as 60 nm for aminemethylnaphthalene.When exposed to protons,the fluorescence of anthracene at 420 nm increases.The results showed suggest that a new family of fluorescent RFSF sensors can be synthesized for biologically important chemicals,including metal ions,metabolites,proteins,and different biomarkers in the future.These valuable assay systems would benefit greatly from a wider choice of fluorescence probes with the same excitation wavelength.

Preparation and Properties of Superhydrophobic Composite Coatings of SiO₂ Nanoparticals/Silicone Resin

WANG Dong, HE Jun-hui, LIU Hong-ying

2011, 29(5):  372-382.  DOI: 10.7517/j.issn.1674-0475.2011.05.372

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SiO₂ nanoparticals/silicone resin composite coatings were prepared by spray-coating,which exhibit superhydrophobicity.Effects of the contents of SiO₂ and silicone resin were investigated preliminarily on the hydrophobic properties of coatings.The results indicate that the water contact angle of composite coatings increases with increase of the content of SiO₂.When the mass percentage of SiO₂ is more than 3wt%,the composite coatings exhibit superhydrophobicity.Meanwhile the mass percentage of silicone resin is 7wt%,the composite coating has a high water contact angle of 151.6 and a small sliding angle of nearly 0.The surface morphologies of coatings were observed by scanning electron microscopy(SEM).It was found that the superhydrophobic composite coating has a rough micro-nanoscale hierarchical structure,with all near-spherical papillas(d≈5 μm) covered by aggregated nanoparticles(d≈50 nm).Such lotus leaf like micro-nano hierarchical structure in combination with the low surface energy of silicone resin renders the coating surface superhydrophobicity.

The Effect of the Interfering Groups on the Aggregation Behavior of Sodium Alkylbenzenesulfonate by Steady-State Fluorescence and ESR

JIANG Xiao-ming, YU Xiao-cui, ZHAO Sui, AN Jing-yi

2011, 29(5):  383-388.  DOI: 10.7517/j.issn.1674-0475.2011.05.383

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The critical micelle concentration,micelle aggregation number,micelle micropolarity and micelle microviscosity of sodium alkylbenzenesulfonates with the interfering groups have been determined by steady-state fluorescence and electron spin resonance.When the number of the interfering groups increases,the cmc,N_agg and the micelle microviscosity decrease,the micelle micropolarity increases.

Study of Self-Assemble and Properties of Amphiphilic Polymer Containing Porphyrin Units in Aqueous Media

WANG Fei, DING Ke-wei, WU Fei-peng

2011, 29(5):  389-397.  DOI: 10.7517/j.issn.1674-0475.2011.05.389

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Two porphyrin monomers 5-(4-acryloyloxyphenyl)-10,15,20-tris(4-carboxylphenyl)porphyrinate zinc(Ⅱ)(ZnAOTCPP) and 5-(4-acryloyloxyphenyl)-10,15,20-tris(4-methoxycarboxylphenyl)porphyrinate zinc(Ⅱ)(ZnMeAOTCPP) were synthesized,and their corresponding amphiphilic polymers with acrylamide(AM) were prepared.Compared with corresponding porphyrin monomer,the polymer containing tricarboxyl-porphyrin units displayed a new absorption band and a new fluorescence emission band in water,while the one containing trimethoxycarboxyl-porphyrin units exhibited an additional new absorption band and fluorescence emission band at even longer wavelength region.The variations of spectroscopic properties of porphyrin units in polymers with increasing concentrations of polymers in aqueous media indicated that the self-assemble behavior of polymers had intermolecular association and intramolecular association two stages.Moreover,the polymer containing trimethoxycarboxyl-porphyrin units showed larger ability in the formation of porphyrin association complexes than the one containing tricarboxyl-porphyrin units.