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Table of Content
23 March 2004, Volume 22 Issue 2
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THE DECAY PROCESSES OF PHOTOELECTRONS OF NANO-SIZED AgBr/I EMULSION PARTICLES
GAO Chun-mei, CAO De-rong, ZHU Lei
2004, 22(2): 81-87. DOI:
10.7517/j.issn.1674-0475.2004.02.81
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By means of varying fish gelat in-AgBr ratio in a double-jet precipitation,nano-sized AgBr/I emulsion particles(average diameter of 13 nm)14 nm)were prepared and observed by TEM.It was discovered that the average size(
d
)of the AgBr/I nanoparticles almost unchanged but its size distribution coefficient(|±σ|/
d
)changed obviously at different fish gelatin-AgBr ratio.Increasing fish gelatin-AgBr ratio in a region from 0.31 g/mmole to 0.62 g/mmole,size distribution coefficient decreased from 19% down to 8.2%.By microwave photoconductivity measurement,two decay components of photoelect rons of nano-sized emulsion particles,initial fast decay and following slow decay,were showed and both components obey the kinetics of first order,which is similar to the situation observed in a cubic emulsion grain with an edge length of 0.6 μm.However,photoelectron lifetimes of nano-sized emulsion particles were shorter than that of the later.
PREPARATION OF SUPPORTED TiO
2
CATALYSTS BY VACUUM ABSORPTION-HYDROLYSIS AND ITS PHOTOCATALYTIC ACTIVITY FOR 1,3-DICHLOROBENZENE DECOMPOSITION
YANG Ping, MOU Zhi-gang, XU Jiao-zhen, HUA Nan-ping, DU Yu-kou
2004, 22(2): 88-93. DOI:
10.7517/j.issn.1674-0475.2004.02.88
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Photocatalysts of TiO
2
supported on activated carbon was prepared by a vacuum absorption-hydrolysis method.The photocatalytic activity was investigated with 1,3-dichlorobenzene as a probe molecule.The results indicate that the supported TiO
2
catalyst was affected by the heating temperature.And recycled times had a little effect on its photocatalytic activity.
STUDY ON THE MECHANISM OF UV CURABLE THERMO-SENSITIVE RECORDING LAYER
GUO Jin-bao, WEI Jie
2004, 22(2): 94-102. DOI:
10.7517/j.issn.1674-0475.2004.02.94
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UVcurable thermo-sensitive recording layer of a thermal-reversible transparent imaging material was prepared by mixing stearic acid,polyethylene glycol stearate in acrylate oligomer.Its mechanism between long-chain molecule and acrylate resin was studied by polarizing microscope,XRD and Differential Scanning Calorimetry (DSC).The results showed that the transition of UV curable recording layer from white and non-transparent state to transparent state happened depending on the transition of long-chain molecule from crystallization state to amorphous state,the work combined with stearic acid and polyethylene glycol stearate gave the recording layer a wider range of transparent temperature.And the
T
g
study showed that the UV curable thermo-sensitive layer showed itself better heat-resisting performance than thermal-plastic thermo-sensitive layer,therefore the layer repetitive using ability was improved.
PHOTOCHEMISTRY BETWEEN ANTHRACENE AND BENZENE RINGS Ⅲ. SYNTHESIS AND PHOTOCYCLOADDITION OF 9-(PHENYLOXY-METHYL) ANTHRACENES
GAO Chun-mei, CAO De-rong, ZHU Lei
2004, 22(2): 103-107. DOI:
10.7517/j.issn.1674-0475.2004.02.103
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9-(Phenyloxymethyl)anthracene 3 were prepared by the coupling reaction between 9- chloromethylanthracene and mono ethers 2 which were synthesized by the etherization between benzyl chloride and hydroquinone or resorcin.The intra-molecular photocycloaddition reaction of 3 between anthracene and benzene rings did not occur because the bond of -phenyl-O-CH
2
-anthryl- of 3 might be easily cleaved under irradiation with UV.Thus,biplanene 4 and lepidopterene 5 were formed by the cleavage of the bond and rearrangement of the radical under the irradiation of the diluted solution of 3 with UV.
PREPARATION OF TiO
2
/SiO
2
COMPLEX THIN FILM BY LIQUID PHASE DEPOSITION METHODS AND THEIR CHARACTERIZATION
ZHANG Chang-yuan, ZHANG Jin-long
2004, 22(2): 108-113. DOI:
10.7517/j.issn.1674-0475.2004.02.108
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TiO
2
/SiO
2
complex thin films were prepared by liquid phase deposition method at low-temperature.Their transparent,crystal structure and image were characterized by UV-Vis,XRD and SEM spectra,respectively.The evaluation of photocatalytic activities of deposited thin films were carried out by degradation of Rhodamine B in water solution under UV irradiation.The results exhibited that complex thin films prepared at room temperature have higher reactivitity for degradation of Rhodamine B.
STUDY OF THE ELECTRIC PROPERTY OF THE SILVER IODO-BROMIDE T-GRAIN MICRO-CRYSTALS
CAO Li-zhi, ZUANG Si-yong
2004, 22(2): 114-119. DOI:
10.7517/j.issn.1674-0475.2004.02.114
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The electron conductivity and hole conductivity of the silver iodo-bromide T-grain crystal doped with K
4
[Fe(CN)
6
] was determined with Wagner polarization.The effects of the temperature,the doping amount and the doping place on the electron conductivity and the hole conductivity were studied.The results showed that with the increase of the doping amount,the electron conductivity and hole conductivity increased indicating that the shallow electron dopant could restrain the recombination of the electrons and the holes effectively.The restraint effects of the dopant varied with the doping region.When the doping amount was kept constant,if the doping place was near the iodide region,the changes of the electron conductivity and hole conductivity were more obvious than that in other places.With the increase of the temperature,the electron conductivity and hole conductivity decreased.
THE INFLUENCE OF ACIDIFICATION ON PHOTOCATALYTIC PROPERTY OF LAYERED K
2
La
2
Ti
3
O
10
LI Tao-hai, WU Ji-huai, LIN Jian-ming, CHENG Ying-han
2004, 22(2): 120-125. DOI:
10.7517/j.issn.1674-0475.2004.02.120
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Photocatalytic degradation of methyl orange over a kind of layered metaloxide was accomplished.K
2
La
2
Ti
3
O
10
,a layered perovskite-type compound with a 1.39 nm interlayer space,exhibited a low activity for methyl orange decomposition.The notable activity was obtained when K
2
La
2
Ti
3
O
10
was acidified in 2 mol/L HNO
3
solution.
PROGRESS OF RESEARCH WORK ON DAR COUPLER
LIU Yu-ting, LÜ Feng, ZOU Jing, ZHANG Da-de, YAO Zu-guang
2004, 22(2): 126-136. DOI:
10.7517/j.issn.1674-0475.2004.02.126
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The progress of research work on DAR coupler,especially for structure and mechanism have been reviewed in this paper.
THE PROGRESS OF HUMIC SUBSTANCES PHOTOCHEMISTRY IN NATURAL WATERS
YANG Hong-sheng, YANG Xi, XU Long, ZHANG Ai-qian
2004, 22(2): 137-144. DOI:
10.7517/j.issn.1674-0475.2004.02.137
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The current review reflects recent advances in photochemistry of humic substances in natural waters. Mechanisms and kinetic factors that control the photochemical processes of humic substances are discussed with emphasis on the formation of reactive oxygen species(ROS) and their reaction pathways. The environmental significance of the photochemistry of humic substances in natural waters is summarized. The authors provide a perspective of future study emphasis in this field of environmental chemistry.
A NEW METHOD OF MEASURING OPTICAL DENSITY WITH CCD TECHNOLOGY
XING Gang, ZHU Rui-lin, NI Hong, CHEN Rong-gang
2004, 22(2): 145-153. DOI:
10.7517/j.issn.1674-0475.2004.02.145
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A new method of measuring optical density with CCD technology is introduced.The basic principle is that for exposure changing the transmissivity τ is equal to changing the exposure time
t
.If the method is used, the calibration of the standard gray scale is not need and the object transmission density on large area can be measured accurately.
SYNTHESIS OF THE NEW DIAR YELLOW COUPLERS
LV Feng, LIU Yu-ting, ZOU Jing, ZHANG Da-de, YAO Zu-guang
2004, 22(2): 154-158. DOI:
10.7517/j.issn.1674-0475.2004.02.154
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Two novel DIAR couplers were synthesized.Coupler-groups of them were yellow couplers,one inhibitor-group was 2-mercaptobenzothiazole and the other was
1
H-benzotriazole-5-carboxylic phenyl ester.Their structures were characterized by
1
H-NMR-spectra,IR-spectra and Mass-spectra.