physical properties and structures of selected pah

... these backgrounds, a series of bisanthene-based novel PAHs with characteristic structures and unique photophysical and electrochemical properties have been synthesized and investigated in detail ... effect transistors (OFETs), solar cells, and sensors.3 Fundamental contributions to the directed synthesis and characterization of PAHs were pioneered byR Scholl, E Clar, and M Zander et al., who ... mode……….……… 68 Figure 4.1 Structures of compounds 4-1, 4-2, 4-3, 4-4 and 4-5……….… … 87 Figure 4.2 UV-vis-NIR absorption (a) and fluorescence spectra (b) of compounds 4-1, 4-2 and 4-3 in dilute toluene...

Ngày tải lên: 10/09/2015, 08:38

... index and the Hausner ratio were calculated to provide a measure of the flow properties and compressibility of MR powders However, firstly bulk and tap densities of MRs were determined before and ... release of drug Physical modification of rice would lead to changes of granular structures and conversion of native rice into cold water-soluble rice or small-crystallite rice [28] Mechanism of drug ... of sustained release (SR) systems to achieve slow release of drug over an extended period of time [1-4] due to low cost, ease of manufacture and relative independence of the physicochemical and...

Ngày tải lên: 14/12/2017, 17:50

... Therefore, the objectives of this study were to analyze (a) the effect of KL4on the physical properties of membranes, in the absence and presence of Ca2+, using fluorescence anisotropy of 1,6-diphenyl-1,3,5-hexatriene ... POPG and DPPC ⁄ PA) were used to Trang 3specifically examine the interaction of KL4with POPGand PA as well as the effect of these lipids on the physical properties of the membrane Effect of KL4on ... mimic some of the structural and functional proper-ties of the native proteins and thus may offer a useful basis for the design of agents for therapeutic interven-tion [7] Studies of different...

Ngày tải lên: 30/03/2014, 11:20

... Trang 1of low band gap PH candidates, such as acenes, rylenes, periacenes, anthenes, zethrenes, bis(phenalenyl)s and indenofluorenes Some of them, such as acenes and rylenes, are extensively ... teranthene and quarteranthene derivatives 1-39 and 1-40, moderate to large biradical character and an edge localization of unpaired electrons are confirmed by a combination of physical measurements and ... distribution of the unpaired electrons at the zigzag edges The investigations of the anthene series have paved the way to understand the intrinsic properties of zigzag edged GNRs and the fabrications of...

Ngày tải lên: 10/09/2015, 09:28

... Table 4.1 Photophysical and electrochemical properties of compounds 2-3 and 4-3 Table 5.1 Photophysical and electrochemical properties of compounds 5-1 and 5-2 Trang 10List of Figures Figure ... (a) MALDI-TOF Mass spectrum of 2-8, (b) FT-IR spectrum of 2-3, (c) FT-IR spectrum of 2-8 Figure 2.3 Optimized molecular structures and frontier molecular orbital profiles of 2-3 and 2-8 Some ... change of optical density of 2-3 and 4-3 as a function of irradiation time Figure 5.1 Resonance structures of two DBHZ isomers and chemical structures of heptazethrene, 5-1 and 5-2 Figure 5.2 Variable...

Ngày tải lên: 10/09/2015, 09:30

... of the donor and the lowest occupied molecular orbital of the Trang 21acceptor, and hence resulting in reduction of the band gap in these materials Following this strategy, a number of low-band ... nm and 353 nm suggesting the formation of the azulenium cations.24 On further protonation, the new bands had a gradual increase, accompanied with a decrement of the bands at 300 nm The color of ... chloroform and re-precipitating in methanol GPC analysis showed a number-average molecular weight of 6,900 and 8,100 for PAzBzC8 and PAzBzOC8 respectively These corresponded to a chain lengths of...

Ngày tải lên: 17/09/2015, 17:19

... materials.9-12 Thus, to have a better understanding of the polymer structure and properties, we prepared the single-crystals of a series of monomers and oligomers containing azulene unit. To further ... spectrum of Oligoa, Oligob, and MonoO6. Structural Analysis Structure of Monoa and Monob. Single crystal of 1,3-dithienyl-azulene (Monoa) and 1,3-di(3-methylthienyl)-azulene (Monob) were obtained and ... Figure 6-13. Thermogram of (a), P3 and its hybrids, (b), P4 and its hybrids. Optical and electrical properties studies The UV/vis absorption spectra of our polymers and hybrids are shown in...

Ngày tải lên: 17/09/2015, 17:19

... likely candidates because of their high thermal and environmental stability both in neutral and doped states, variety of molecular designs and wide range of potential applications The properties of ... Reduction of band gap conjugated polymers As we discussed above, the values of Eg (HOMO-LUMO separation) determines the electrical and optical properties of the resulting polymers, and is therefore of ... dependence of the energies and equilibria of neutral and charged excitations as a function of the conjugation length the crystallography of the monomers and oligomers for elucidating the folding properties...

Ngày tải lên: 17/09/2015, 17:19

... STRUCTURES, PROPERTIES, AND APPLICATIONS OF SOLUBLE POLYAZULENE AND AZULENECONTAINING COPOLYMERS WANG FUKE (M Sc, Fudan Univ.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... advice and friendship. Thanks also go to Ms. Tan G. K. of the X-ray Diffraction Lab of Department of Chemistry for her assistance in analysis of the single crystal structures, all staff of Central ... polymes-inorganic hybrids 22 iii 4. Azulene and Polyazulenes 26 4.1. Unique structure and interesting properties of azulene 27 4.2 Recent application of azulene and its derivatives in materials science...

Ngày tải lên: 17/09/2015, 17:19

... Diffraction Analysis Of MTA And Portland cement 56 Trang 5CHAPTER 4 4 Manuscript Draft for Journal of Endodontics: Comparison Of The Physical And Mechanical Properties Of MTA and Portland Cement 71 ... 1COMPARISON OF THE PHYSICAL PROPERTIES AND SEALING ABILITY OF MTA AND PORTLAND CEMENT DR INTEKHAB ISLAM B.D.S A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF SCIENCE DEPARTMENT OF RESTORATIVE ... Draft for Journal of Endodontics: Comparison Of The Root-end Sealing Ability Of MTA And Portland Cement 86 Trang 7LIST OF TABLES 1 Table 4.1 Summary of the physical properties of the cements...

Ngày tải lên: 03/10/2015, 20:59

... an important index of soil quality and health and is an important component of the soil fertility of farmlands, as well as being the core of soil quality and function (Pan and Zhao, 2005) SOC ... significant interactions of tillage and straw returning on SOC concentration of >0.25 mm and <0.25 mm aggregates, MBC of bulk soil and <0.25 mm aggregate, and DOC concentration of >0.25 mm ... addition of C inputs has been profusely reported, a quantitative evaluation of soil physical properties under integrated nutrient management system Thus, the balance and imbalanced use of nutrients...

Ngày tải lên: 28/09/2020, 17:26

... AFEX-treated corn stover and wheat straw and the impact of AFEX pretreatment on pellet physical properties The authors indicated that high quality pellets in terms of density and durability can be ... that of corn grain and durability was 99%, which exceeds the standard durability (97.5%) set for handling and transportation of pellets (BSI, 2010) Bals et al (2013) went a step further and did ... objectives of this study were to determine the impact of grind size (4 mm, 6 mm), die speed (40, 50, 60 Hz), and preheating (none, 70 °C) on physical properties of pellets (unit, bulk and tapped...

Ngày tải lên: 02/11/2022, 09:24

... not recommended as part of routine evaluation because of its cost and areas of limited technical facilities The problem of cost of TB culture may be the reason why only 48% of pulmonary specimens ... history and physical examination alone or chest x-ray in the diagnosis of pulmonary tuberculosis Ninety two percent of respondents (n=35) use 4-drug regimen in the treatment of PTB The duration of ... diagnosis of pulmonary PTB (Table 4) A standard 4-drug regimen was used by most of the respondents (n=35; 92%) and the remaining 8% (n=3) use a 3-drug regimen consisting of rifampicin, isoniazid and...

Ngày tải lên: 15/03/2014, 03:20

... Na+orK+ions A numberof isoforms of the a and b subunits has been isolated from various tissues of numerous species, and it has been repeatedly demonstrated that the function of Na+/ K+-ATPase requires ... groups of Val304, Ala305, and Ile307 (M4) and through the side-chain oxygen atoms of Asn796 and Asp800 (M6) and Glu309 (M4) [26] A similarsituation could be assumed forthe coordination of cations ... distributed isoform, there is the b2 isoform that is found in excitable tissues (muscle and nervous tissue), the b3 in testes, adr enal, and brain, and the bm in skeletal and heart muscle In view of the...

Ngày tải lên: 24/03/2014, 00:21

... Use of Nickel and Tantalum from a Materials Science Point of View 171 Yu Cao and Lars Nyborg Other applications: Electrical, Structural and Biomedical 195 Properties and Applications of Ceramic ... Trang 3free online editions of InTech Books and Journals can be found at www.intechopen.com Trang 5Identification and Kinetic Properties of the Photosensitive Impurities and Defects in High-Purity ... Shanina and E N Kalabukhova One-dimensional Models for Diffusion and Segregation of Boron and for Ion Implantation of Aluminum in 4H-Silicon Carbide 29 Yasuto Hijikata Hiroyuki Yaguchi and Sadafumi...

Ngày tải lên: 20/06/2014, 04:20

... instant of time. The value of the first derivative was calculated as the right-hand side of rate equations (3), and that of the second derivative, as the derivative of the right- hand side of Eqs. ... instant of time. The value of the first derivative was calculated as the right-hand side of rate equations (3), and that of the second derivative, as the derivative of the right- hand side of Eqs. ... charge states of ISi and IC in 4H-SiC are the same as those in 3C-SiC, the ranges of m and n in Eqs (1a) and (2a) are limited to m ∈ {0, 1, 2, 3, and 4} and n ∈ {0, ±1, and 2} Boron...

Ngày tải lên: 20/06/2014, 04:20

... first Step (A) and then the repetition of Steps (B) and (C). Figure 4 is the process for low temperature deposition and evaluation of the film, consisting of Steps (A), (D) and (E). Step (D) ... first Step (A) and then the repetition of Steps (B) and (C). Figure 4 is the process for low temperature deposition and evaluation of the film, consisting of Steps (A), (D) and (E). Step (D) ... obtained at 1070 K and at monomethylsilane gas flow rate of 0.05 slm The flow rate of hydrogen chloride and hydrogen... rate of 0.092 slm and hydrogen chloride gas flow rate of 0.15 slm...

Ngày tải lên: 20/06/2014, 04:20

... family of III-nitrides and ZnO, had spun a great deal of interest to magnetic properties of these materials The resulting 5 Trang 10Properties and Applications of Silicon Carbide90flurry of activities ... B, C, and L, and that the values of B/A, C, and L, and the temperature de- pendences of C and L for Si-face are different from those for C-face Finally, we have discussed the mechanism of the ... B, C, and L, and that the values of B/A, C, and L, and the temperature de- pendences of C and L for Si-face are different from those for C-face Finally, we have discussed the mechanism of the...

Ngày tải lên: 20/06/2014, 04:20

... characterization of chemical and biological agents and materials, remote and standoff early-warning for chemical-biological warfare threats, and imaging of concealed weapons and explosives, just ... applications because of its distinct properties, the possibility of easy growth on a native oxide, and the presence of numerous polytypes [1-4] Silicon carbide is made up of equal parts silicon and carbon ... applications because of its distinct properties, the possibility of easy growth on a native oxide, and the presence of numerous polytypes [1-4] Silicon carbide is made up of equal parts silicon and carbon...

Ngày tải lên: 20/06/2014, 04:20

... formation of alternating Ni-silicide and C layers The systems which show the tendency of the formation of periodic bands have relatively large parabolic rate constant k and k0 values (intercept of the ... formation of alternating Ni-silicide and C layers The systems which show the tendency of the formation of periodic bands have relatively large parabolic rate constant k and k0 values (intercept of the ... formation of silicide, to hexagonal planar structures and the formation of ordered stacking structures along c axis The structure of C is less complete at lower temperature 2.4.4 Distribution of phases...

Ngày tải lên: 20/06/2014, 04:20