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影像科学与光化学
 
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Imaging Science and Photochemistry
 
2018 Vol.36 Issue.4
Published 2018-07-15

0
2018 Vol. 36 (4): 0-0 [Abstract] ( 7 ) [HTML 1KB] [ PDF 255KB] ( 26 )
299 Study on Fluorescence Spectral Behavior of 1,5-Diphenyl-3-biphenylyl-2-pyrazoline
LI Junfen, LI Pengxia, ZHANG Lin, DONG Chuan
The pyrazoline derivatives have excellent hole-transfer performance and luminescent properties. In this paper, the spectral behaviors of 1,5-diphenyl-3-biphenylyl-2-pyrazoline (DBP) were investigated by fluorescence spectroscopy briefly. DBP has strong fluorescence emission, and its spectral behaviors were significantly affected by solvent polarity and acidity. With the increase of solvent polarity, the fluorescence emission of DBP showed a remarkably red shift, and the difference of dipole moments between the excited state and the ground state increased due to intramolecular charge transfer. Under strong acidic conditions, the fluorescence of DBP was significantly quenched and quantum yield reduced. In addition, the fluorescence of DBP were effectively quenched by acceptors of fluorenone and trinitrofluorenone, because of strong intermolecular photoinduced charge transfer. The charge transfer between DBP and trinitrofluorenone was obviously stronger than fluorenone. Further experiment shows that the fluorescence quenching of DBP by fluorenone or trinitrofluorenone was dynamic quenching process.
2018 Vol. 36 (4): 299-305 [Abstract] ( 24 ) [HTML 1KB] [ PDF 731KB] ( 38 )
306 Synthesize and Characterization of New Block Copolymer for Directed Self Assembly
LI Bing, LI Haibo, Mark Neisser, Caleb L. Breaux, Clifford L. Henderson
A new block copolymer poly(tert-butyl styrene)-b-Poly(hydroxyethylmethylacrylate) with high Flory-Huggins parameter was designed, and it was synthesized by anionic polymerization and atom transfer radical polymerization, respectively. Then it was characterized by nuclear magnetic resonance (NMR) for the volume fraction of the two blocks, and by small angle X-ray scatter for the morphology and size after micro phase separation. The results showed that the block copolymer with anionic polymerization preparation had better molecular weight disperse. In addition, after the micro phase separation and in the condition of the same molecular weight, it could form the smaller-morphorlogy ordered structure with the cylinder phase of 9.93 nm size and the lamellar phase of 8.42 nm size.
2018 Vol. 36 (4): 306-314 [Abstract] ( 19 ) [HTML 1KB] [ PDF 3385KB] ( 29 )
315 Rapid Fluorescence Detection of Glutamic Acid and Aspartic Acid by Spirocyclic Rhodamine 6G Hydrazide
XIE Xiange, XIA Fangyuan, HUANG Suqin, PENG Xiaowei, FU Yan, WANG Xiaomei, TAO Xutang
A spirocyclic rhodamine 6G hydrazide was used as fluorescence probe to detect glutamic acid and aspartic acid in aqueous solution. Both sample solution emitted 550 nm green light in 1 minute (the excitation wavelength is 500 nm).The detection limit can be as low as 7×10-8 mol/L and 1.4×10-7 mol/L respectively. Finally, the mechanism of selective and rapid fluorescence detection for glutamic acid and aspartic acid was analyzed.
2018 Vol. 36 (4): 315-323 [Abstract] ( 10 ) [HTML 1KB] [ PDF 4957KB] ( 26 )
324 Cardiac Toxicity Study of C70 Fullerenol Nanoparticles in Mice
GUO Jun, ZHOU Yue, YANG Dongzhi, ZHEN Mingming, XU Hui, WANG Chunru
The cardiac effect of C70 fullerenol nanoparticles (C70-OH NPs) was studied in mice. After treated with the C70-OH fullerene of normal therapeutic dose, behavioral observation, cardiac coefficient, blood biochemical changes, pathological changes and tissue transmission of mice were detected. The results showed that the commonly used small molecule vascular blocker combretastatin disodium phosphate (CA4P) significantly damaged the myocardium, while C70-OH did not show significant cardiotoxicity.
2018 Vol. 36 (4): 324-330 [Abstract] ( 16 ) [HTML 1KB] [ PDF 2995KB] ( 22 )
331 One-step Synthesis of Composited MoS2/TiO2 Nanotube Arrays and Its Photoelectrochemical Properties
LI Yue, LI Hongying, CHANG Yuxue, ZHOU Hongyan, YU Xiang
In this paper, MoS2 nanoparticles were successfully deposited on TiO2 nanotube arrays by anodic oxidation method and cyclic voltammetry method, obtaining MoS2/TiO2 composited nanotubes. Compared with the unmodified TiO2 nanotube arrays, the photoelectrochemical properties and photocatalytic propeties of the composited MoS2/TiO2 nanotube arrays have been significantly improved. The results of photocurrent experiments showed that the photocurrent density of MoS2/TiO2 composited nanotubes is the highest (0.35 mA/cm2) when the deposition number of MoS2 cycles is 30 cycles, which is 3.88 times as much as the unmodified TiO2 (0.09 mA/cm2). The MoS2/TiO2 composited nanotubes exhibited improved photocatalytic degradation efficiency than that of unmodified TiO2 by comparison tests of photocatalytic degradation of 4-nitrophenol. The enhanced photoelectrochemical and photocatalytic activity is attributed to the enhanced visible absorption capacity, as well as the faster migration rate of electrons and holes on the MoS2/TiO2 composited nanotubes.
2018 Vol. 36 (4): 331-339 [Abstract] ( 16 ) [HTML 1KB] [ PDF 3916KB] ( 24 )
340 Novel Colorimetric Method for Urine Test Strips Based on Smartphone Image
YANG Renbing, CHENG Wenbo, QIAN Qing, ZHANG Qiang, BAI Pengli, PAN Yujun, DUAN Peng
This paper proposes a new colorimetric analysis algorithm based on smartphone images. Conforming to human eye vision, it has the advantages of minor calculation and best calculating stability. This method converts the color information of the original nonlinear RGB color space to the CIELab color space that conforms to the human vision, therefore the reference color closest to the test color can be accurately picked. Meantime, "vertical point method" is proposed innovatively to further quantify the similarity of color information and realize the quantitative analysis of urine test strips. As for the experiment, the pH (4.59.5), glucose content (060 mmol/L) and protein content (04 g/L) in artificial urine were quantitatively analyzed by taking photos of urine test strips in an ambient light-isolated box, and visual colorimetry was used as a control. The results show that the proposed colorimetric algorithm is not only accurate, reliable, reproducible and computable, but also suitable for application in urine test strip colorimetric analysis based on mobile phone images.
2018 Vol. 36 (4): 340-349 [Abstract] ( 19 ) [HTML 1KB] [ PDF 5054KB] ( 28 )
350 CD-DNA/GO Fluorescent Nanoprobe for Detection of miRNA-21 in situ Live Cell
HU Xianyun, MENG Tiehong, WANG Chuanming, ZHANG Ruguo, LI Wei, LÜ Tingyong, JIANG Jiazhi, MO Xingze, LONG Youguo, YU Yuesheng, PAN Weidong
By using carbon dots (CD) to label DNA as fluorophore by biological coupling method, combining with graphene oxide (GO) as quencher, CD-DNA/GO fluorescent nanoprobe was constructed, and developed for miRNA-21 detection. In CD-DNA/GO, the fluorescence of CD was quenched by GO through long-range resonance energy transfer (LrRET). In present of miRNA-21, the DNA bind with miRNA-21 to form duplex, releasing CD-DNA from GO and interrupting the LrRET, and the fluorescence of CD was recovery to achieve miRNA-21 detection by fluorescence "turn on" mode. The obtained the linear range for miRNA-21 was from 1 nmol/L to 500 nmol/L; the detection of limit was estimated to be 0.2 nmol/L by the miRNA-21 fluorescent nanoprobe. The nanoprobe was achieved for detection of miRNA-21 in situ live cell imaging, which provide the basic research for in situ diagnosis and treatment of leukemia.
2018 Vol. 36 (4): 350-358 [Abstract] ( 15 ) [HTML 1KB] [ PDF 4696KB] ( 22 )
359 The Molecular Imaging Techniques in Medical Imaging
WU Rui, LIU Cunfang, GE Hongguang, ZHANG Qiang, SONG Juan, SHI Juan, TIAN Guanghui
Molecular imaging is an emerging technology in biomedicine recently. Through the visual representation,characterization and quantificacation of biological processes at the cellular and molecular levels within intact living organisms. Molecularing imaging provides effective methods to deeply unravel the mechanism of physiological and pathological processes, detect and monitor diseases and their treatments in real-time. dynamic, subtle, non-invasive, targeting way. Promisingly, it can be predicted that the rapid development of molecular imaging can lead to great changes of clinical medicine in the near future. In this review, molecular imaging was discussed.
2018 Vol. 36 (4): 359-366 [Abstract] ( 19 ) [HTML 1KB] [ PDF 1216KB] ( 32 )
367 Research Progress of Paper-based Fluorescent Sensor on Carbon Quantum Dots for Visual Detection
GAO Wenyu, ZHOU Yihua, TENG Xiao, WU Lihui, CAO Sheng
Carbon quantum dots (CQDs), as a new class of nanomeaterials, have exhibited broad appeal for chemical inspections according to their peculiar fluorescent properties. When interacting with detected molecules, their tunable fluorescence intensity can be applied in visual detection which includes FQ-type (fluorescent quenching) and FR-type (fluorescent recovery) detection. Compared with aqueous fluorescent sensors, paper-based devices are more extensively utilized in the field of substance inspections concerning their superiorities in portability, fast-response, on-site examination and visualization. Herein, we review recent research status and progress in the field of CQDs to provide a future perspective incorporating fluorescent properties of CQDs, current visual fluorescent inspections and paper-based sensors.
2018 Vol. 36 (4): 367-379 [Abstract] ( 27 ) [HTML 1KB] [ PDF 6274KB] ( 35 )
影像科学与光化学
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