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Table of Content
15 March 2013, Volume 31 Issue 2
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Dendrimer-Based Nanoscale CT Contrast Agents: Preparation and Biomedical Applications
PENG Chen, SHI Xiang-yang
2013, 31(2): 81-90. DOI:
10.7517/j.issn.1674-0475.2013.02.001
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Dendrimers are a family of highly branched, monodispersed synthetic macromolecules with well defined structural composition and architecture. Based on the unique structure of dendrimers, the synthesis and application of novel types of dendrimer-related CT imaging agents are reviewed in this article. Furthermore, future perspectives in the application and development of dendrimers-based CT imaging contrast agents are introduced.
Research Progress in Preparation of Mechanically Durable SiO
2
Antireflective Coatings by Acid Catalyzed Sol-Gel Process
ZHANG Zhi-hui, HE Jun-hui, YANG Qiao-wen
2013, 31(2): 91-102. DOI:
10.7517/j.issn.1674-0475.2013.02.002
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Mechanically durable antireflective coatings are used to reduce surface reflection and increase light transmittance. They exhibit low density, adjustable refractive index and high abrasion-resistance. In the current paper, recent researches on mechanically durable antireflective coatings were reviewed. It introduced the mechanism and influence factors of acid-catalyzed sol-gel process for preparing silica sols, the preparation of mechanically durable antireflective coatings by acid catalyzed sol-gel process and two methods which assist the process. The research perspectives and application potentials were also discussed.
The Research and Present Situation of Cyclic Acetals in Photopolymerization
YANG Jin-liang, WANG Ke-min, NIE Jun
2013, 31(2): 103-116. DOI:
10.7517/j.issn.1674-0475.2013.02.003
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Cyclic acetals, a kind of photo-sensitive compounds, were widely investigated during the 1960s.However, the drawbacks of cyclic acetals, such as the narrow range of absorption wavelength and the low initiation efficiency, had limited the development in the late 20
th
century. Nevertheless, in the recent five years, cyclic acetals such as 1,3-benzodioxole have drawn renewed attention in photopolymerization, especially in the field of photopolymerized biomaterials, since cyclic acetals could be used as coinitiator so as to increase the initiation efficiency or decrease the toxicity of photoinitiating system. In this paper, the photopolymerization behavior of cyclic acetals has been systematically described, and the research progress of cyclic acetals as photoinitiator or co-initiator has also been discussed in detail.
Syntheses of Bithiophene Bridged Bis-terpyridine, Protonation and Complexation with Metal Cations (M
2+
)
LI Chun-li, LI Biao, WANG Zhi-hua, WANG Hua
2013, 31(2): 117-124. DOI:
10.7517/j.issn.1674-0475.2013.02.004
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Bithiophene bridged bis-terpyridine (
BTTPY
) was synthesized in a total yield of 13%, via formylation, Kröhnke pyridine synthesis and Suzuki coupling with 2,5-dibromothiophene as raw material. UV-Vis and fluorescence spectra of
BTTPY
exhibit strong red shift in acetic acid and trifluoroacetic due to strong protonation. UV-Vis titration shows that complexation of
BTTPY
and M
2+
(Ni
2+
, Zn
2+
, Cd
2+
, Cu
2+
) could be occurred with a coordination ratio of 1:1. AFM image displays that organometallic polymer could be formed through complexation of
BTTPY
and Cd
2+
.
Surface Properties of UV-Heat Cured Films of Organosilicon Modified Epoxy Monoacrylates
LIU Hong-bo, LIN Feng, XIAO Wang-dong, XU Ling, ZHANG Wu-ying
2013, 31(2): 125-131. DOI:
10.7517/j.issn.1674-0475.2013.02.005
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A series of UV-heat hybrid curable compositions were prepared by using organosilicon modified epoxy monoacrylates (OMEMA) as resins. The change of absorption peaks of double bond and epoxy group were identified by FTIR spectra during UV-heat curing process. The influence of different kinds and content of active diluents on the gel content, water absorption and water contact angle of UV-heat cured films were investigated. Mass content of Si in surface of UV-heat cured films was tested by the energy dispersive spectrometer(EDS). The gel contents of UV cured films were lower than 86.5%, and the gel contents of UV-heat cured films were about 97%. Compared to the epoxy monoacrylates (EMA) compositions with same active diluents, the water contact angle of UV-heat cured films of OMEMA system was increased from 62.53 to 99.27. The data of EDS testing proved that the Si content of air side of UV-heat cured films was higher than glass side.
Highly Selective Fluorescent Sensing of Fe
3+
by a New Anthraquinone Derivative 1,8-Bis(2-hydroxyethylimino) Anthraquinone
SHI Li-li, SUN Huan-he, SHANG Zhuo-bin, WANG Yu
2013, 31(2): 132-139. DOI:
10.7517/j.issn.1674-0475.2013.02.006
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A new fluorionophore, which is composed of anthraquinone and a hydroxyl ethanol-amine receptor, has been synthesized. Effect of metal ions on the fluorescence of the ionophore was investigated. The results show that the ionophore displays a highly selective and sensitive response of fluorescence quenching toward Fe
3+
in neutral buffer aqueous solution. There is a good linear relationship between the fluorescence intensity and Fe
3+
concentration in the range of 4.0?10
-5
-3.0?10
-4
mol/L. The detection limit is 3.8?10
-7
mol/L.
Synthesis and Photopolymerization Properties of Curable Benzophenone Derivative Photoinitiator
ZHU Xiao-dan, LU Jian, HAN Yin-feng, WANG Ke-min
2013, 31(2): 140-149. DOI:
10.7517/j.jssn.1674-0475.2013.02.007
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The curable photoinitiator of 4-(acrylate-2-hydroxypropylate-3-oxy) benzophenone(AEBP) containing unsaturated double bond was synthesized by 4-(2,3-epoxypropoxy) benzophenone(EBP) and acrylic acid through ring-open reaction method. The chemical structure was characterized by FT-IR and
1
HNMR. The UV absorption wavelength of AEBP was characterized by UV-Vis spectrum. The photopolymerization kinetics of AEBP were investigated by RT-IR, extraction method was applied to compare the migration of BP with AEBP after cured. The results showed that double bond conversion increased with the increase of AEBP concentration, when EDAB concentration was 1.2%, the final double bond conversion was the optimum, the initiating efficiency of AEBP with diacrylate monomer were better than that with triacrylate monomer. The rate of polymerization increased with light intensity. After cured with monomers, the migration of AEBP reduced greatly compared with that of traditional BP.
Research on the Optoelectronic Properties of SnS Thin Films Prepared by Two-Stage Process
JI Qiang, SHEN Hong-lie, JIANG Feng, WANG Wei, ZENG You-hong
2013, 31(2): 150-156. DOI:
10.7517/j.issn.1674-0475.2013.02.008
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SnS thin films were prepared by two-stage process. Sn precursor layers were deposited on glass substrates by sputtering and followed by sulfurization of the metallic tin precursor layers at 220℃ in a furnace for 60 min. The characterization results of microstructures, composition and optical and electrical properties show that the SnS film presents p-type conductivity and has a (040) preferred grain orientation; SnS film has an orthorhombic structure, and the surface is uniform and density with the ratio of Sn to S close to 1. It is found that the film shows a high optical absorption coefficient of 5×10
4
cm
-1
and persistent photoconductivity effect. It has a direct energy band gap of 1.23 eV. The prepared SnS film is useful as an absorption layer of solar cells and for fabrication of photo-sensitive device.