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Table of Content
23 January 2010, Volume 28 Issue 1
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Spectroscopic Study on the Interaction of Metal Complexes of Hypocrellin A with Human Serum Albumin
JIN Mi-mi, OU Zhi-ze, GAO Yun-yan, HAO Ping, YIN Wei-feng, LIU Li-hua
2010, 28(1): 1-9. DOI:
10.7517/j.issn.1674-0475.2010.01.1
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Interaction of metal complexes of hypocrellin A(M-HA),such as Mg
2+
-HA, Y
3+
-HA,La
3+
-HA with human serum albumin(HSA) is studied by spectroscopic methods. The results suggest that M-HA and HSA can form 1:1 complex with moderate association constants(>2×10
4
L/mol) at pH 7.4 and 5.0.Electron paramagnetic resonance (EPR) and fluorescence quenching experiments indicate that photoinduced electron transfer from HSA to M-HA may occur at excited state.
Synthesis and Characterization of Er-Yb Codoped LaPO
4
Nanocrystals Possessing Near-IR Fluorescence
WANG Qi, BO Shu-hui, HU Jin, ZHEN Zhen, LIU Xin-hou
2010, 28(1): 10-18. DOI:
10.7517/j.issn.1674-0475.2010.01.10
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Rare earth ions(Er
3+
,Eu
3+
and Yb
3+
) doped LaPO
4
and YbPO
4
nanocrystals were synthesized by a coordinate precipitation method.In a high temperature organic solution the LaCl
3
and tributyl phosphate form a complex and react with H
3
PO
4
to yield LaPO
4
nanocrystals.The structural properties of LaPO
4
nanocrystals were studied by X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),Fourier transform infrared spectrometer(FT-IR). HRTEM measured the size about 4 nm and showed the clear lattice fringe image of the nanocrystals which validated the high crystallinity.XRD patterns show that the samples crystallized in monazite structure.The emission of the nanocrystals under 975 nm excited was measured and the peak was at 1535 nm.Elemental analysis result revealed that the common desiccation in vacuum was failed to remove the residual quenching group such as O—H and C—H.When coated by a LaPO
4
shell the fluorescence intensity was obviously enhanced.It validated the conclusion that the core/shell structure could enhance the emission of nanocrystals.
The Toning Effect of Nicotinic Acid on Thermographic Imaging Material
ZHANG Zhan-jiang, LI Jin-pei
2010, 28(1): 19-28. DOI:
10.7517/j.issn.1674-0475.2010.01.19
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Nicotinic acid was introduced as a toner into the thermographic material based on silver stearate(AgSt).The results showed that nicotinic acid obviously increased the developed silver density, changed the image color from golden-yellow to black,altered the morphology of developed silver particle,enlarged the silver particle size,and aligned the silver particles as paralleled chains of pearls.Further study revealed that nicotinic acid lowered the thermal transition temperature of the silver source and the values of pH and pAg in the emulsion of the said material.Novel silver carboxylate complex may have been resulted by heating the mixture of AgSt and Nicotinic acid.
Preparation and Photochromic Properties of Viologen/Polymer Film Blended with Copper Chloride
LI Zhi-bin, LI Ling, ZHANG Zhen-lin, WANG Yue-chuan
2010, 28(1): 29-36. DOI:
10.7517/j.issn.1674-0475.2010.01.29
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Fast erasable photochromic films with well photofatigue property are prepared by blending of copper chloride into viologen/polyvinylpyrrolidone mixture.Photochromic performance,thermal fading and photofatigue properties of the films were studied.It has been found that with the addition of copper chloride there is color lost in the first UV irradiation,but the fading rate of the colored films are faster.The half life at 60℃of the film,prepared by exposing to UV irradiation for 80 s and mole ratio of copper chloride to viologen 1:1,is abut 9 min,in comparing with 54 min for the film with no copper chloride.The higher mole ratio of copper chloride in the films,the faster the thermal erasing rate is.With increasing of coloring-discoloration cycle number,the photochromic color of the films become much deeper,and the more copper chloride in the films,the deeper the color is.These photochromic films can be used for information storage,sunglass and smart windows.
Molecular Design of Ethers with High Acidolysis Activity Used for Dissolution Inhibitor/Accelerator in Photo/Thermal Imaging
YU Shang-xian, CONG Pei-jun, YANG Jin-rui, SHAO Zheng-chun, WANG Da-wei, GU Jiang-nan
2010, 28(1): 37-46. DOI:
10.7517/j.issn.1674-0475.2010.01.37
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A general method for synthesizing active ethers(with complete etherification) synthesized from vinyl alkyl ether and low molecular weight phenol is investigated and the optimum synthesis conditions are proposed in this paper.Established a series of parameters between phenol and imaging, e.g.,hydroxy equivalent(
N
oh
)>critical alkaline aqueous insoluble hydroxy equivalent,critical alkaline aqueous soluble hydroxy equivalent and
M
P
/
A
value interpreted as ratio of dissolution inhibition to dissolution acceleration.Established alkaline solubilities of phenol(
AS
TW
) based on various imaging requirements:highly alkaline soluble,alkaline soluble,slightly alkaline soluble and alkaline insoluble.Measured or calculated parameters of active ether,i.e.average ether equivalent,calibrated average ether equivalent related to molecular weight,
M
E
/
A
E
value and DL(ration of
M
E
/
A
E
to
M
P
/
A
).Proposed several empirical formulae and molecular design rules of active ether for photo /thermal imaging based on the above parameters as well as author’s experiences in photo/thermal imaging.
Study on CuS Nanoflakes in 1-
n
-Butyl-3-methylimidazolium Chloride Ionic Liquid
FENG Xian-tao, LIU Chun-yan
2010, 28(1): 47-51. DOI:
10.7517/j.issn.1674-0475.2010.01.47
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Sodium sulfide aqueous solution was used as the precipitator to deposit copper sulfide from copper chloride ionic liquid(1-
n
-Butyl-3-methylimidazolium chloride ionic liquid) solution.The size of the copper sulfide nanoflakes could be controlled by tuning the reaction temperature.The comparative experiments revealed that the IL had a crucial action on the formation of the flake-like copper sulfide nanostructure.UV-Vis characterization revealed that the as prepared nanostructures have a broad absorption band from 240 to 600 nm.
A Novel UV Photoresist Matrix Resin and Its Photolithographic Processes
XIE Wen, LIU Jian-guo, LI Ping
2010, 28(1): 52-58. DOI:
10.7517/j.issn.1674-0475.2010.01.52
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The poly(N-(p-carboxylphenyl)methacrylamide-co-N-phenylmaleimide) was copolymerized with monomer N-(p-carboxylphenyl)methacrylamide(NCMA) and N-phenylmaleimide(NPMI). To apply this copolymer as the matrix resin with photosensitizer and solvents to fomulate a novel thermostable UV positive photoresist.The photoresist formulation and the photolithographic process were studied and optimized.Its optimal formulation was 15%—20%matrix resin, 4.5%—6%photo-sensitizer,and 70%—80%solvent,and its photolithographic process was spincoating 30 s(4000 rpm),pre-baking 4 min at 90℃,exposuring 3 min,developing in 0.2% TMAH aqueous solution for 10 s and then post-baking 2 min at 90℃.
Facile Preparation of Soft Spherical and Cuboid-Like Silica Hollow Structures
CHEN Xue-cheng, WANG Hang, ZHANG Shen, HE Pu, HE Jun-hui
2010, 28(1): 59-64. DOI:
10.7517/j.issn.1674-0475.2010.01.59
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Soft spherical and cuboid-like silica hollow structures were successfully fabricated using self-assembled pyrene nanostructures as template.When different amounts of pyrene self-assembled in CTAB solution,resultant self-assembled structures showed notable morphological changes from spheres to cuboids.These templates were employed for their sol-gel transcription of silica.As a result, transcribed silica structures of spheres to cuboids were obtained depending on the volume fraction of pyrene.The template was eventually removed by ethanol,giving soft spherical(ca.400 nm in diameter) and cuoboid-like(0.5—2.5μm in length) silica hollow structures.These results displayed the advantages of using organic nanostructures as template for fabrication of inorganic hollow structures in terms of easy syntheses,diverse structures,and flexibility of controlling the morphologies of inorganic structures.
Recent Progress in Synthesis and Properties of the Core-Shell Nanoparticles
WANG Ying, WANG Hua, LI Rong, DU Yu-kou
2010, 28(1): 65-78. DOI:
10.7517/j.issn.1674-0475.2010.01.65
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As an important branch of composite nanoparticles,core-shell nanoparticles have received great concern due to their versatility of optics,catalysis,megnetism recently.In this paper,a comprehensive review was presented on the core-shell nanoparticles including the preparation,application, and then the development trends of core-shell nanoparticles were also proposed.
