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Table of Content
20 February 1993, Volume 11 Issue 1
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MEASURING THE THICKNESS OF TABULAR SILVER HALIDE CRYSTALS WITH SCANNING ELECTRONIC MICROSCOPE
LIU SU-WEN, YUE JUN, YAN TJAN-TANG
1993, 11(1): 1-4. DOI:
10.7517/j.issn.1674-0475.1993.01.1
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A Simple method for measuring the thickness of tabular silver halide grains with scanning electronic microscope is reported in the present paper. The preparation of the specimen and the application of inclination effect of scanning electronic microscope for measuring the thickness of T-grain are also discussed.
EFFECT OF ANION SURFACTANT ON THE SURFACE OF CdS SEMICONDUCTOR CATALYST IN HETEROGENEOUS PHOTOCATALYTIC CLEAVAGE OF HYDROGEN SULFIDE
CHEN ZHI-HONG, WANG HAN-HUI, YU JIA-YONG
1993, 11(1): 5-12. DOI:
10.7517/j.issn.1674-0475.1993.01.5
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Photocatalytic cleavage of hydrogen sulfide into hydrogen and sulfur in aqueous alkaline solution with CdS semiconductor photocatalyst has been studied. It has been examined that sodium lauryl sulfate (SDS) anion surfactant effects on catalyst surface property and catalytic activity in above system. The change of the flatband potential of CdS single crystal electrode is measured with electrochemical method when SDS is added into above system at concentration below the CMC. Thus, It is concluded that the flatband potential of CdS single crystal is shifted toward positive direction in the presence of SDS. The present consequence accords with the decrease of hydrogen quantities evoluted from hydrogen sulfide of photocatalytic cleavage in above system. It is approached that the flatband potential of CdS single crystal electrode is shifted toward positive direction, which is due to competitive adsorption of anion of surfactant and S
2-
of the system on the surface of CdS single crystal electrode.
STUDY OF PHOTOSENSITIVE CROWN ETHERS CONTAINING BENZOPHENONE MOIETY
LI MIAO-ZHEN, CHANG ZHI-YING, WANG ER-JIAN, HUANG SHU, YU KUI, JIAN GUANG-HUA, TIAN BAO-ZHI
1993, 11(1): 13-19. DOI:
10.7517/j.issn.1674-0475.1993.01.13
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The photochemical behavior of photosensitive crown ethers, benzoylbenzo-15-crown-5(BPC) and bis(4-benzo-15-crown-5) ketone(CBPC), were studied spectrophotometrically and kinetical-ly. The absorption and emission spectral data showed that BPC and CBPC are characteristic of ππ
*
at lowest excited state. Their photochemical properties are similar to that of r.lkoxyl substituted benzophenone. Under UV irradiation compounds of BPC and CBPC readily undergo photoreaction with tertiary amine to produce radical species. This photoreduction process was monitored by absorption spectroscopy. These photosensitive crown ethers, BPC and CBPC, have been used as the initiators in combination with tertiary amine for vinyl photopo-lymerization. The polymerization rate (
R
p
) is directly proportional to (BPC)
0.17
(TEA)
0.29
and (MMA)
0.81
.
INTRAMOLECULAR ENERGY TRANSFER BETWEEN INDOLE AND 9,10-DIMETHOXYANTHARCENE SEPARATED BY RIGID SPACERS
ZHOU SHENG-ZE, ZHOU QING-FU, XU HUI-JUN
1993, 11(1): 20-27. DOI:
10.7517/j.issn.1674-0475.1993.01.20
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Two energy donor-acceptor systems have been synthesized by linking indole and 9,10-dime-thoxyanthracene with methylene and β-estradiol spacers. Intramolecular energy transfer between indole and 9, 10-dimethoxyanthracene and its relation to distance and solvent polarity have been studied. Efficient singlet energy transfer can take place in two systems. When energy donor and acceptor are separated by long rigid β-estradiol the mechanism of energy transfer is dopole-dipole interaction. The distance between donor and acceptor calculated by Forster theory agrees with that obtained from Corey-Pauling-Koltun (CPK) model of molecule and the effect of solvent polarity on energy transfer has also been investigated.
A STUDY ON THE PHOTOEMISSION BEHAVIOR OF INTRA-MOLECULAR CHARGE TRANSFER COMPOUNDS--N,N-DIMETHYLAMINOSTYRYLMALONONITRILE
WANG PENG-FEI, WU SHI-KANG
1993, 11(1): 28-34. DOI:
10.7517/j.issn.1674-0475.1993.01.28
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In this work, two new intramolecular charge transfer compounds [Bis(p-N,N-dimethyl-aminostyryl)malononitrile (Ⅰ) and (p-N, N-dimethylaminostyryl)phenylmalononitrile(Ⅱ)] were synthesized and characterized. The spectra and photophysical behavior were studied in diffe-cent solvents. Results showed that the fluorescence quantum yield for compound (Ⅰ) increased, but that for compound (Ⅱ) had a maximum with the increasing of the solvent polarity. This phenomenon was discussed preliminarily.
FLUORESCENCE LIFETIMES, QUANTUM YIELDS AND SPEC-TRAL PROPERTIES OF PHYCOBILIPROTEINS FROM BLUE-GREEN ALGA SPIRULINA PLATENSIS
XIA AN-DONG, ZHU JIN-CHANG, WU HUA-JU, JIANG LI-JIN, ZHANG XIN-YI
1993, 11(1): 35-40. DOI:
10.7517/j.issn.1674-0475.1993.01.35
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Phycobiliproteins with different aggregations have different molar excitinction coefficients. The assembling states lead to the different conformations of phycocyanobilins chromophores in C-phycocyanin and allophycocyanin which cause different spectral properties. As a result, on the higher aggregations for C-phycocyanin and allophycocyanin, the conformations of phy-cocyanobilin chromophores modulated through protein-chromophore interaction may play an important role in solar energy harvesting and excitation energy migration from these antenna proteins to photosynthetic reaction centers.
DETERMING IODIDE-CONTAINING STRUCTURE OF SINGLE SILVER IODOBROMIDE MICROCRYSTAL IN THE ULTRATHIN SECTION
Xu YONG-EN, WANG YU-PING
1993, 11(1): 41-45. DOI:
10.7517/j.issn.1674-0475.1993.01.41
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The Study of stratified iodide distribution in a single silver iodobromide tnicrocrystal by ultrathin sectioning and X-ray line scan were carried out. The result coincides with anticipated iodide distribution. X-ray line scan acrossthinner sample provides a relative accurate technique to determine stratified structure containing different amount of iodide. It will help us improve the preparation of silver iodobromide emulsion. The space resolving power of X-ray source and thickness of ultrathinsection in the experimental condition of this work were discussed.As a check test, the ultrathin section, of a commercial color film was prepared and the structure of microcrystals in the ultrathin section was determined by X-ray line scan.
INVESTIGATION OF PHOTOCHEMICAL BEHAVIOR OF PHENYL-(ESTRA-17 β-OL-3)- DIAZENE IN POLY-METHYL METHACRYLATE FILM
Rudolf Frank, SHEN YU-QUAN, Hermann rau
1993, 11(1): 46-54. DOI:
10.7517/j.issn.1674-0475.1993.01.46
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The cis-trans photoisomerization of phenyl-(estta-17 β-ol-3)-diazene (P E D) in polymethyl methacrylate film was investigated. Measurement and evaluation principle and methodology of quantum yield, composition of photostationary state, free volume distribution of the polymer bulk and so on were introduced in detail for cis-trans photoisomerizations in such solid matrix under π, π
*
or n,π
*
excitations. These analysis should also be applicable to other similar photochromic system.
1993, 11(1): 55-61. DOI:
10.7517/j.issn.1674-0475.1993.01.55
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1993, 11(1): 62-69. DOI:
10.7517/j.issn.1674-0475.1993.01.62
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STUDIES ON PHOTOSENSITIZED ELECTRON TRANSFER ISOMERIZATION OF DIMETHYL N-(p-TOSYL)-7-AZA-BICYCLO (2.2.1)-2,5-HEPTADIENE-2,3-DICARBOXYLATE
CHEN ZHAO-BIN, TANG KAI-JUN, XIA ZHI-ZHONG, MENG XIAN-JUAN, FAN MEI-GONG
1993, 11(1): 70-72. DOI:
10.7517/j.issn.1674-0475.1993.01.70
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The conversion rate and quantum yield of photosensitized isomerization of dimethyl N-(
p
-tosyl)-7-aza-bicyclo(2.2.1)-2, 5-heptadiene-2, 3-dicarboxylate, with diphenylguanidine and N-ethylcarbazole as sensitizer, have been measured. The reaction mechanism of electron transfer Is omerization was proposed.
THE AGGREGATION AND THE FLUORESCENCE SPECTRUM CHARACTER OF CHOLESTEROL ESTER COMPOUNDS IN MIXED SOLVENTS
LIU RI-XIN, SHEN YIAN-QING, WU SHI-KANG
1993, 11(1): 73-78. DOI:
10.7517/j.issn.1674-0475.1993.01.73
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The aggregation behavior of some cholesterol esters in ethylene glycol monoether/watet mixed solvent has been studied preliminarily in this work. Result indicates that this mixed solvent possesses good ability for promoting aggregate formation. The formation of excimer of naphthalene can be observed clearly while the aggregation of cholesterol ester occurs. The process of photoinduced electron-transfer and the formation of exciplex can also be observed while the two cholesterol esters, which were used as electronic donor and acceptor respectively, were aggregated together.
SPECTROSCOPIC STUDY ON MOLECULAR AGGREGATION BEHAVIOR OF 4’-FORMYL-4-STILBAZOLE
CHANG ZHI-YING, LI MIAO-ZHEN, NIE JMN, WANG ER-JIAN
1993, 11(1): 79-84. DOI:
10.7517/j.issn.1674-0475.1993.01.79
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Molecular aggregation of 4’-formyl-4-stilbazole compound (FSA) and its different sails were studied in the aqueous solution by electron spectrophotometry.A new absorption band at 360 nm resulted from the aggregation state of FSA was observed in differential spectra and disappeared quickly upon UV irradiation.The excimer fluorescence band of FSA was located at around 490 nm along with monomer emission band at 410 nm. The ratio of the intensity (
I
ex
,/
I
m
) raises obviously with increasing concentration of FSA. The aggregation of FSA occurs more intensively in the salt form-than in the free base form and varys with different counter ions.Addition of polymer PAA, PVP and PSA to the FSA system leads to more favorable for excimer formation due to the dramatic increase in a local concentration of FSA by intermo-lecular association with the polymer chain.
1993, 11(1): 85-86. DOI:
10.7517/j.issn.1674-0475.1993.01.85
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1993, 11(1): 87-87. DOI:
10.7517/j.issn.1674-0475.1993.01.87
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1993, 11(1): 88-89. DOI:
10.7517/j.issn.1674-0475.1993.01.88
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1993, 11(1): 90-90. DOI:
10.7517/j.issn.1674-0475.1993.01.90
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1993, 11(1): 91-94. DOI:
10.7517/j.issn.1674-0475.1993.01.91
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1993, 11(1): 95-95. DOI:
10.7517/j.issn.1674-0475.1993.01.97
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1993, 11(1): 95-95. DOI:
10.7517/j.issn.1674-0475.1993.01.95
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1993, 11(1): 96-96. DOI:
10.7517/j.issn.1674-0475.1993.01.96
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