scholarly journals Structural Optimization of Alkylbenzenes as Graphene Dispersants

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 238
Author(s):  
Shimpei Takeda ◽  
Yuta Nishina
Keyword(s):  
Aromatic Compounds ◽  
Mass Production ◽  
Alkyl Chain ◽  
Molecular Design ◽  
Vital Role ◽  
Alkyl Chain Length ◽  
Alkyl Chains ◽  
Graphene Dispersion ◽  
Liquid Phase Exfoliation ◽  
Dispersing Agents

Among the several methods of producing graphene, the liquid-phase exfoliation of graphite is attractive because of a simple and easy procedure, being expected for mass production. The dispersibility of graphene can be improved by adding a dispersant molecule that interacts with graphene, but the appropriate molecular design has not been proposed. In this study, we focused on aromatic compounds with alkyl chains as dispersing agents. We synthesized a series of alkyl aromatic compounds and evaluated their performance as a dispersant for graphene. The results suggest that the alkyl chain length and solubility in the solvent play a vital role in graphene dispersion.

Untersuchungen der elektrischen Leitfähigkeit homologer 4,4′-Di-n-alkyloxy-azoxybenzole im nematischen Phasenbereich / Investigation of the Electric Conductivity of Homologous 4,4′-Di-n-alkoxyazoxybenzenes in their Nematic Phase

1975 ◽  
Vol 30 (3) ◽  
pp. 316-322 ◽  
Author(s):  
G. Heppke ◽  
F. Schneider
Keyword(s):  
Electric Conductivity ◽  
Chain Length ◽  
Nematic Phase ◽  
Alkyl Chain ◽  
Electrolyte Concentration ◽  
Alkyl Chain Length ◽  
Effect Of Temperature ◽  
Alkyl Chains ◽  
Long Chains

The effect of temperature and concentration of the added electrolyte tetrabutylammoniumpicrate on the electric conductivity of homologous 4,4′-di-n-alkoxyazoxybenzenes (C1 to C8) in their nematic phase is investigated. In general an increase of the alkyl chain length results in a decrease of the ratio of anisotropy x∥/x⊥. At the lowest temperature of the nematic phase values between 1,6 (C2) and 0,45 (C8) are obtained. This behaviour can be explained by the formation of cybotactic groups with a smectic structure. Increasing the electrolyte concentration reduces the ratio of anisotropy for short alkyl chains, whereas for long chains the ratio rapidly increases.

Understanding the effect of alkyl chains of gemini cations on the physicochemical and cellular properties of polyurethane micelles

2018 ◽  
Vol 6 (7) ◽  
pp. 1899-1907 ◽  
Author(s):  
Zhicheng Pan ◽  
Danxuan Fang ◽  
Yuanqing Song ◽  
Nijia Song ◽  
Mingming Ding ◽  
...  
Keyword(s):  
Surface Charge ◽  
Chain Length ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Absorption Properties ◽  
Protein Absorption ◽  
Alkyl Chains

The alteration of the gemini alkyl chain length could affect the surface charge exposure, stability, and the protein absorption properties of nanocarriers.

scholarly journals Thermal stability of imidazolium-based ionic liquids

2016 ◽  
Vol 4 (1) ◽  
pp. 51-64 ◽  
Author(s):  
Léa Chancelier ◽  
Olivier Boyron ◽  
Thibaut Gutel ◽  
Catherine Santini
Keyword(s):  
Thermal Stability ◽  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Van Der Waals Interactions ◽  
Alkyl Chains ◽  
Coulombic Interactions ◽  
The Impact ◽  
Thermal Stability Of

This work highlights the factors tuning the thermal stability of imidazolium-based ionic liquids (IL) associated to bis(trifluoromethanesulfonyl)imide anion [NTf2]. The decomposition temperatures (Td) were evaluated by thermogravimetric analyses (TGA) with optimized parameters to obtain reproducible Td. The impact of the alkyl chain length and of the presence of functional groups and unsaturations on Td were evaluated. The thermal behaviour was governed by Van der Waals interactions between alkyl chains, and by inter and intra coulombic interactions such as hydrogen bonds.

Modeling the interfacial thermal resistance of diamond nanorod composites and related materials

2014 ◽  
Vol 03 (03) ◽  
pp. 1450014 ◽  
Author(s):  
Tad Whiteside ◽  
Marie A. Priest ◽  
Clifford W. Padgett
Keyword(s):  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Thermal Resistance ◽  
Composite System ◽  
Functional Group ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Interfacial Thermal Resistance ◽  
Alkyl Chains ◽  
Dynamics Simulations

In this paper, the effect on the interfacial thermal resistance between a composite system composed of a carbon nanotube or diamond nanorod and an octane matrix by the functionalization of those nanostructures with alkyl chains has been examined using molecular dynamics simulations. The effect of functionalization was studied by varying the percent functionalization from 0.00% to 2.00% using octyl as the functional group. As the percent functionalization increased, both systems showed a decrease in the interfacial thermal resistance. At 1.00% functionalization, as the alkyl chain length was increased from one to eight atoms, the interfacial thermal resistance of the carbon nanotube systems decreased to a minimum, while in the diamond nanorod system the interfacial thermal resistance remained constant.

Biological Activity of New N-Oxides of Tertiary Amines

2006 ◽  
Vol 61 (9-10) ◽  
pp. 715-720 ◽  
Author(s):  
Halina Kleszczyńska ◽  
Krzysztof Bielecki ◽  
Janusz Sarapuk ◽  
Dorota Bonarska-Kujawa ◽  
Hanna Pruchnik ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Chain Length ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Resting Membrane Potential ◽  
Tertiary Amines ◽  
Alkyl Chains ◽  
Main Transition ◽  
Chain Compounds ◽  
Potassium Leakage

AbstractPotential biological properties of newly synthesized single and double alkyl chain N-oxides of tertiary amines (NTA) were studied. Individual compounds in each of the series had alkyl chains of different length. Various experiments were performed to determine a mechanism of the interaction between NTA and model and biological membranes. These were measurements of hemolytic efficiencies of NTA (pig erythrocytes), their influence on the transition temperatures (DPPC liposomes), on potassium leakage from cucumber, its growth and chlorophyll content (Cucumis sativus cv. Krak F1), and on the resting membrane potential in alga cells (Nitellopsis obtusa). Also, prevention of erythrocyte membrane lipid oxidation induced by UV irradiation was studied. Potential antioxidative properties of NTA were additionally tested in radical chromogen (ABTS●+) experiments in which antioxidative efficiencies of NTA were compared to that of the standard antioxidant Trolox. It was found that NTA readily interacted with erythrocyte membranes. Their hemolyzing efficiency increased with the alkyl chain length. Slightly more intensive interaction was found for double alkyl chain compounds. Similar results were obtained in DSC experiments, where incorporation of NTA into liposomal membranes shifted the main transition temperatures and caused a broadening of the main transition peaks depending on the alkyl chain length. Double alkyl chain compounds were also found more efficiently influencing the growth of cucumber. Influence of NTA on the resting membrane potential of algae cells was not quite following the alkyl chain length rule found in erythrocyte and liposome experiments. Also potassium leakage and chlorophyll content determined in physiological experiments were not following the increase of lipophilicity of compounds. Most efficiently influencing those parameters were NTA having shorter alkyl chains, and efficiencies of single alkyl chain compounds were evidently stronger. Both methods used to test the antioxidative properties of NTA showed that they depended on the alkyl chain lengths of compounds within each series, but double alkyl chain ones exhibited markedly greater efficiency.

scholarly journals Using Sulfobutylated and Sulfomethylated Lignin as Dispersant for Kaolin Suspension

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2046
Author(s):  
Derya Yesim Hopa ◽  
Pedram Fatehi
Keyword(s):  
Quartz Crystal ◽  
Alkyl Chain ◽  
Kraft Lignin ◽  
Alkyl Chain Length ◽  
Acidic Ph ◽  
Charge Densities ◽  
Alkyl Chains ◽  
Kaolin Suspension ◽  
Coated Surface ◽  
Positively Charged

Kraft lignin is an abundant natural resource, but it is underutilized. In this study, sulfoalkylated lignin derivatives with similar charge densities but with different alkyl chain length were produced via sulfobutylation and sulfomethylation reactions. The contact angle studies revealed that sulfobutylated lignin (SBL) with longer alkyl chains had a higher hydrophobicity than sulfomethylated lignin (SML) did. The adsorption behavior of sulfoalkylated lignins was studied using a Quartz crystal microbalance with dissipation (QCM-D) on Al2O3 coated surface as representative of positively charged sites of kaolin particles. The results of adsorption studies showed that SBL deposited more greatly than SML did on the Al2O3 surface, and it generated a thicker but less viscoelastic adlayer on the surface. The adlayer thickness and configuration of molecules on the surface were also related to the zeta potential and stabilization performance of the polymers in the kaolin suspension system. The results also confirmed that both lignin derivatives were very effective in dispersing kaolin particles at neutral pH, and their effectiveness was hampered under alkaline or acidic pH.

Aggregation behavior of zwitterionic surface active ionic liquids with different counterions, cations, and alkyl chains

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27370-27377 ◽  
Author(s):  
Panpan Sun ◽  
Lijuan Shi ◽  
Fei Lu ◽  
Liqiang Zheng
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Self Assembly ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Aggregation Behavior ◽  
The Self ◽  
Alkyl Chains ◽  
Surface Active

The effects of anionic type, cationic structure and alkyl chain length are illustrated to regulate the self-assembly of zwitterionic SAILs.

scholarly journals The effect of the cation alkyl chain length on density and diffusion in dialkylpyrrolidinium bis(mandelato)borate ionic liquids

2014 ◽  
Vol 16 (48) ◽  
pp. 26798-26805 ◽  
Author(s):  
Andrei Filippov ◽  
Mamoun Taher ◽  
Faiz Ullah Shah ◽  
Sergei Glavatskih ◽  
Oleg N. Antzutkin
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Linear Dependence ◽  
Alkyl Chain ◽  
Additive Model ◽  
Alkyl Chain Length ◽  
Alkyl Chains ◽  
P Diffusion ◽  
And Diffusion ◽  
Diffusion Behaviour

Diffusion behaviour and non-linear dependence of density of [CnC1Pyrr][BMB] ionic liquids on the number of CH2 groups in the long alkyl chains of the cations were described using an additive model, in which ‘ionic’ and ‘aliphatic’ regions make additive contributions.

How does alkyl chain length modify the properties of triphenylamine-based hole transport materials?

2018 ◽  
Vol 6 (5) ◽  
pp. 960-965 ◽  
Author(s):  
Kun-Han Lin ◽  
Antonio Prlj ◽  
Clémence Corminboeuf
Keyword(s):  
Chain Length ◽  
Organic Materials ◽  
Alkyl Chain ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Alkyl Chain Length ◽  
Multiscale Simulations ◽  
Alkyl Chains ◽  
Systematic Exploration ◽  
Fine Tune

Manipulating the length of alkyl chains is a widely-adopted strategy to fine tune the properties of organic materials. Yet, a systematic exploration of the influence of chain length on those properties most relevant to highly performing hole transport materials in perovskite solar cells is lacking. Multiscale simulations, along with morphological analyses, uncover relationships between alkyl chain length and HTM properties providing important insights for the optimization of future organic materials.

Sign in / Sign up

Export Citation Format

Share Document