Chemistry of exciplexes. 9. Viscosity effect on intramolecular exciplex formation in saturated hydrocarbons

1980 ◽  
Vol 102 (8) ◽  
pp. 2806-2810 ◽  
Author(s):  
Nein-Chu C. Yang ◽  
Soon Bin Neoh ◽  
Takeaki Naito ◽  
Lay-Keow Ng ◽  
Donald A. Chernoff ◽  
...  
Keyword(s):  
Saturated Hydrocarbons ◽  
Exciplex Formation ◽  
Viscosity Effect

ChemInform Abstract: CHEMISTRY OF EXCIPLEXES. 9. VISCOSITY EFFECT ON INTRAMOLECULAR EXCIPLEX FORMATION IN SATURATED HYDROCARBONS

1980 ◽  
Vol 11 (29) ◽  
Author(s):  
N.-C. YANG ◽  
S. B. NEOH ◽  
T. NAITO ◽  
L.-K. NG ◽  
D. A. CHERNOFF ◽  
...  
Keyword(s):  
Saturated Hydrocarbons ◽  
Exciplex Formation ◽  
Viscosity Effect

Liquid Crystal Trimers Incorporating Saturated Isosteres of Benzene and Exhibiting Modulated Nematic Phases

2019 ◽  
Author(s):  
Adam Al-Janabi ◽  
Richard Mandle
Keyword(s):  
Liquid Crystal ◽  
Helical Structure ◽  
Molecular Shape ◽  
Saturated Hydrocarbons ◽  
Fluid System ◽  
Structural Requirement ◽  
Disubstituted Benzene ◽  
Bona Fide ◽  
Nematic Phases ◽  
Bend Angles

<p>The nematic twist-bend (N<sub>TB</sub>) liquid crystal phase possesses a local helical structure with a pitch length of a few nanometres and is the first example of spontaneous symmetry breaking in a fluid system. All known examples of the N­<sub>TB­</sub> phase occur in materials whose constituent mesogenic units are aromatic hydrocarbons. It is not clear if this is due to synthetic convenience or a <i>bona fide</i> structural requirement for a material to exhibit this phase of matter. In this work we demonstrate that materials consisting largely of saturated hydrocarbons could also give rise to this mesophase. Furthermore, replacement of 1,4-disubstituted benzene with <i>trans</i> 1,4-cyclohexane or even 1,4-cubane does not especially alter the transition temperatures of the resulting material nor does it appear to impact upon the heliconical tilt angle, suggesting the local structure of the phase is unperturbed. Calculating the probability distribution of bend angles reveals that the choice of isosteric group has little impact on the overall molecular shape, demonstrating the shape-driven nature of the N<sub>TB</sub> phase. </p>

scholarly journals Production of Fuels and Chemicals from a CO2/H2 Mixture

Reactions ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 130-146
Author(s):  
Yali Yao ◽  
Baraka Celestin Sempuga ◽  
Xinying Liu ◽  
Diane Hildebrandt
Keyword(s):  
Co2 Hydrogenation ◽  
Water Gas Shift ◽  
Liquid Fuels ◽  
Saturated Hydrocarbons ◽  
Reverse Water Gas Shift ◽  
Cu Catalyst ◽  
In Series ◽  
Fuels And Chemicals ◽  
Water Gas ◽  
Aspen Simulation

In order to explore co-production alternatives, a once-through process for CO2 hydrogenation to chemicals and liquid fuels was investigated experimentally. In this approach, two different catalysts were considered; the first was a Cu-based catalyst that hydrogenates CO2 to methanol and CO and the second a Fisher–Tropsch (FT) Co-based catalyst. The two catalysts were loaded into different reactors and were initially operated separately. The experimental results show that: (1) the Cu catalyst was very active in both the methanol synthesis and reverse-water gas shift (R-WGS) reactions and these two reactions were restricted by thermodynamic equilibrium; this was also supported by an Aspen plus simulation of an (equilibrium) Gibbs reactor. The Aspen simulation results also indicated that the reactor can be operated adiabatically under certain conditions, given that the methanol reaction is exothermic and R-WGS is endothermic. (2) the FT catalyst produced mainly CH4 and short chain saturated hydrocarbons when the feed was CO2/H2. When the two reactors were coupled in series and the presence of CO in the tail gas from the first reactor (loaded with Cu catalyst) significantly improves the FT product selectivity toward higher carbon hydrocarbons in the second reactor compared to the standalone FT reactor with only CO2/H2 in the feed.

Solvent and viscosity effect on the kinetics of the thermal cis-trans isomerization of 3'-nitro-4-diethylaminoazobenzene

1989 ◽  
Vol 11 (3) ◽  
pp. 179-189 ◽  
Author(s):  
Bruno Marcandalli ◽  
Pier Luigi Beltrame ◽  
Ernestina Dubini-Paglia ◽  
Alberto Seves
Keyword(s):  
Viscosity Effect ◽  
Trans Isomerization ◽  
Kinetics Of

Experiments and mechanistic modeling of viscosity effect on a multistage ESP performance under viscous fluid flow

2021 ◽  
pp. 095765092110149
Author(s):  
Yi Shi ◽  
Jianjun Zhu ◽  
Haoyu Wang ◽  
Haiwen Zhu ◽  
Jiecheng Zhang ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Viscous Fluid ◽  
Prediction Error ◽  
Flow Direction ◽  
Fluid Viscosity ◽  
Oil Viscosity ◽  
Viscous Fluid Flow ◽  
Viscosity Effect ◽  
High Production Rate ◽  
Pump Head

Assembled in series with multistage, Electrical Submersible Pumps (ESP) are widely used in offshore petroleum production due to the high production rate and efficiency. The hydraulic performance of ESPs is subjected to the fluid viscosity. High oil viscosity leads to the degradation of ESP boosting pressure compared to the catalog curves under water flow. In this paper, the influence of fluid viscosity on the performance of a 14-stage radial-type ESP under varying operational conditions, e.g. rotational speeds 1800–3500 r/min, viscosities 25–520 cP, was investigated. Numerical simulations were conducted on the same ESP model using a commercial Computational Fluid Dynamics (CFD) software. The simulated average pump head is comparable to the corresponding experimental data under different viscosities and rotational speeds with less than ±20% prediction error. A mechanistic model accounting for the viscosity effect on ESP boosting pressure is proposed based on the Euler head in a centrifugal pump. A conceptual best-match flowrate QBM is introduced, at which the impeller outlet flow direction matches the designed flow direction. The recirculation losses caused by the mismatch of velocity triangles and other head losses resulted from the flow direction change, friction loss and leakage flow etc., are included in the model. The comparison of model predicted pump head versus experimental measurements under viscous fluid flow conditions demonstrates good agreement. The overall prediction error is less than ±10%.

Substitution Effect on Carbazole-centered Donors for Tuning Exciplex Systems as Cohost for Highly Efficient Yellow and Red OLEDs

2021 ◽  
Author(s):  
Li-Ming Chen ◽  
I-Hung Lin ◽  
Yu-Chi You ◽  
Wei-Chih Wei ◽  
Meng-Ju Tsai ◽  
...  
Keyword(s):  
Substitution Effect ◽  
Exciplex Formation ◽  
Highly Efficient ◽  
Hole Transporting ◽  
Red Oleds ◽  
Hole Transporting Materials

Three new carbazole-based hole-transporting materials PTCz-9’Cz, PTCz-3’TCz, and PTCz-NTol2 were synthesized, characterized, and examined the propensity of exciplex formation with electron-transporting material PO-T2T. Through enhancing the electron-donating ability of the...

Characteristics in oxidative degradation by ozone for saturated hydrocarbons in soil contaminated with diesel fuel

Chemosphere ◽  
2007 ◽  
Vol 66 (5) ◽  
pp. 799-807 ◽  
Author(s):  
Do-Yun Yu ◽  
Namgoo Kang ◽  
Wookeun Bae ◽  
M. Katherine Banks
Keyword(s):  
Diesel Fuel ◽  
Oxidative Degradation ◽  
Saturated Hydrocarbons

ChemInform Abstract: PHOTOCYCLOADDITION OF β-METHYLSTYRENES TO SOME 9-CYANOPHENANTHRENES. CHEMICAL CONSEQUENCES OF EXCIPLEX FORMATION

1978 ◽  
Vol 9 (33) ◽  
Author(s):  
R. A. CALDWELL ◽  
N. I. GHALI ◽  
C.-K. CHIEN ◽  
D. DEMARCO ◽  
L. SMITH
Keyword(s):  
Exciplex Formation

scholarly journals Study of the industrial contaminations containing hydrocarbon components and their effect on correlation of protective properties of textiles for clothes

2018 ◽  
Vol 226 ◽  
pp. 02027
Author(s):  
Irina Cherunova ◽  
Elena Yakovleva ◽  
Ekaterina Stefanova
Keyword(s):  
Ministry Of Education ◽  
State Technical ◽  
Potential Influence ◽  
Saturated Hydrocarbons ◽  
Protective Properties ◽  
Textile Materials ◽  
Wet Processing ◽  
Main Components ◽  
High Level ◽  
Made In

The article represents trends and results of world investigations for safety of textile materials for humans and environment. The algorithm for identification of potential influence vector of chemical emissions from textile and the environmentally aimed methods based on the alternative chemical substances for textile wet processing were presented. Using the procedure for oleophobic effect determination, the oil resistance levels of a number of modern fabrics for clothes were established. The experimental research results of the oil products concentration in the textile materials after chemical treatment based on the method of the capillary gas chromatography were presented. It was found out that hydrocarbons from C14H30 Tetradecane to С36Н74 Hexatriacontane are the main components with high level of contaminants concentration. The average values of hydrocarbon concentration on the cleaned up samples for the main areas of the clothe surface were determined. Accumulation of residual contaminations, based on saturated hydrocarbons (С17Н36 – С25Н52 block) and related special-purpose clothes areas, was identified. Recommendations for target-oriented correlation of the clothes protective properties were proposed. UWO (unified work order). The research was made in Don State Technical University within the framework of State Assignment of the Ministry of education and science of Russia under the project 11.9194.2017/BCh.

scholarly journals An interatomic potential for saturated hydrocarbons based on the modified embedded-atom method

2014 ◽  
Vol 16 (13) ◽  
pp. 6233-6249 ◽  
Author(s):  
S. Nouranian ◽  
M. A. Tschopp ◽  
S. R. Gwaltney ◽  
M. I. Baskes ◽  
M. F. Horstemeyer
Keyword(s):  
Interatomic Potential ◽  
Embedded Atom Method ◽  
Computationally Efficient ◽  
Saturated Hydrocarbons ◽  
Embedded Atom ◽  
Modified Embedded Atom Method

Extension of the computationally efficient modified embedded-atom method to hydrocarbons and polymers.

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