Category: 111-87-5

Kolobova, E. published the artcileSelective oxidation of n-octanol on unmodified and La-modified nanogold catalysts: Effect of metal content, Synthetic Route of 111-87-5, the main research area is gold titania lanthanum catalyst octanol oxidation.

We investigated the influence of metal loading in gold catalysts supported on titania, either unmodified or La-modified, on their catalytic performance and the formation of active sites for selective oxidation of n-octanol under mild conditions. Catalysts were characterized by BET, EDX, ICP, HRTEM, FTIR CO and XPS. Gold content had a significant effect on the catalytic properties of unmodified catalysts: activity of Au/TiO2 increased by increasing the metal load. However, in the case of a lanthanum-modified support samples, an increase of gold content from 0.5 to 4 weight% had no effect on its activity (ca. 40% conversion after 6 h for all catalysts). This catalytic behavior is due to a change in the surface concentration of Au+ ions. For the unmodified catalysts, the surface concentration of Au+ ions increased with increasing gold loading, and, as a consequence, a significant increase in activity was observed For La-modified catalysts, the surface concentration of Au+ ions is almost the same for all gold concentrations; as a result, no increase in activity was observed with the increase in gold content. It points to Au+ ions as the most probable active sites for the studied reaction.

Catalysis Today published new progress about Oxidation. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Synthetic Route of 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ogden, Phillip B. published the artcileReversed phase HPLC with high temperature ethanol/water mobile phases as a green alternative method for estimation of octanol/water partition coefficients, Recommanded Product: n-Octanol, the main research area is high temperature liquid chromatog ethanol water mobile phase; octanol partition coefficient linear solvation energy relationship; Ethanol/water mobile phases; High temperature liquid chromatography; Linear solvation energy relationships; Octanol/water partition coefficient; Snyder-soczewinski equation.

High temperature ethanol/water was explored as a green eluent in the reversed-phase liquid chromatog. approximation of pure water retention (log kw) and subsequent estimation of the octanol/water partition coefficient (log P) via the Collander equation and the Leave-One-Out method. As part of this work, linear solvation energy relationships were employed to compare the log kw extrapolated systems based on high temperature ethanol/water, ambient acetonitrile/water, and ambient methanol/water mobile phases. Based on the comparisons of the three organic modifiers, high temperature ethanol/water mobile phases were observed to provide the best estimation of log P. This conclusion is based on a high log P correlation of 0.968 R2 and a near unity cos θ value of 0.997 between LSER coefficient vectors of ethanol/water estimated log P and octanol/water log P systems. The method employed in this work, further, provided high correlation for the hydrogen-bonding basicity term between the two systems.

Journal of Chromatography A published new progress about Partition. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hanson, Kaila B. published the artcileEstimating n-octanol-water partition coefficients for neutral highly hydrophobic chemicals using measured n-butanol-water partition coefficients, Category: alcohols-buliding-blocks, the main research area is octanol butanol water partition coefficient; Collander equation; n-Butanol/water partition coefficients; n-octanol/water partition coefficients (K(OW)).

Direct measurement of the n-octanol partition coefficients (KOW) for highly hydrophobic organic chems. is extremely difficult because of the extremely low concentrations present in the water phase. n-Butanol/water partition coefficients (KBW) are generally much lower than KOW due to the increased solubility of solute in the alc. saturated aqueous phase, and therefore become easier to measure. We measured the KBW for 25 neutral organic chems. having measured log KOWs ranging from 2 to 9 and 4 addnl. highly hydrophobic chems., with unmeasured KOWs, having estimated log KOWs ranging from 6 to 18. The measured log KBW and log KOW values were linearly related, r2 = 0.978, and using the regression developed from the data, KOWs were predicted for the 4 highly hydrophobic chems. with unmeasured KOWs. The resulting predictions were orders of magnitude lower than those predicted by a variety of computational models and suggests the estimates of KOW in the literature for highly hydrophobic chems. (i.e., log KOW greater than 10) are likely incorrect by several orders of magnitude.

Chemosphere published new progress about Partition. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hodges, Geoff published the artcileA comparison of log Kow (n-octanol-water partition coefficient) values for non-ionic, anionic, cationic and amphoteric surfactants determined using predictions and experimental methods, COA of Formula: C8H18O, the main research area is partition coefficient surfactant prediction.

Surfactants are widely used across the globe both in industrial and consumer products. The n-octanol/water partition ratio or coefficient (log Kow) and n-octanol/water distribution coefficient (log D) are key parameters in environmental risk assessment of chems. as they are often used to estimate the environmental fate and bioavailability and thus exposure and toxicity of a compound Determining log Kow data for surfactants is a tech. challenge due to their amphiphilic properties. Currently several existing exptl. OECD methods (e.g. slow-stirring, HPLC, solubility ratio) and QSPR models are available for log Kow/D measurement or prediction. However, there are concerns that these methods have not been fully validated for surfactants and may not be applicable due to the specific phase behavior of surfactants. Results: The current methods were evaluated for the four surfactant classes (non-ionic, anionic, cationic and amphoteric). The solubility ratio approach, based on comparative n-octanol and water solubility measurements, did not generate robust or accurate data. The HPLC method generates consistently higher log Kow values than the slow-stirring method for non-ionics, but this pos. bias could be removed using reference surfactants with log Kow values determined using the slow-stirring method. The slow-stirring method is the most widely applicable exptl. method for generating log Kow/D data for all the surface-active test compounds Generally, QSPR-predicted log Kow/D values do not correlate well with exptl. values, apart for the group of non-ionic surfactants. Relatively, large differences in predicted log Kow/D values were observed when comparing various QSPR models, which were most noticeable for the ionised surfactants. Conclusions: The slow-stirring method is the most widely applicable exptl. method for generating log Kow/D data for all the four surfactant classes. A weight of evidence approach is considered appropriate for non-ionic surfactants using exptl. and model predications. However, it is more difficult to apply this approach to ionisable surfactants. Recommendations are made for the preferred existing QSPR predictive methods for determination of log Kow/D values for the surfactant classes. Investigation of newer alternative exptl. log Kow methods as well as more biol. relevant and methodol. defensible alternative methods for describing partitioning of surfactants are recommended.

Environmental Sciences Europe published new progress about Partition. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, COA of Formula: C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Yi-Fan published the artcileTreatment of particle/gas partitioning using level III fugacity models in a six-compartment system, HPLC of Formula: 111-87-5, the main research area is particle gas partitioning fugacity model six compartment system; Equilibrium; Fugacity model; Particle/gas partition; SVOCs; Steady state.

In this paper, two level III fugacity models are developed and applied using an environmental system containing six compartments, including air, aerosols, soil, water, suspended particulate matters (SPMs), and sediments, as a “”unit world””. The first model, assumes equilibrium between air and aerosols and between water and SPMs. These assumptions lead to a four-fugacity model. The second model removes these two assumptions leading to a six-fugacity model. The two models, compared using four PBDE congeners, BDE-28, -99, -153, and -209, with a steady flux of gaseous congeners entering the air, lead to the following conclusions. 1. When the octanol-air partition coefficient (KOA) is less than 1011.4, the two models produce similar results; when KOA > 1011.4, and especially when KOA > 1012.5, the model results diverge significantly. 2. Chems. are in an imposed equilibrium in the four-fugacity model, but in a steady state and not necessary an equilibrium in the six-fugacity model, between air and aerosols. 3. The results from the six-fugacity model indicate an internally consistent system with chems. in steady state in all six compartments, whereas the four-fugacity model presents an internally inconsistent system where chems. are in equilibrium but not a steady state between air and aerosols. 4. Chems. are mass balanced in air and aerosols predicted by the six-fugacity model but not by the four-fugacity model. If the mass balance in air and aerosols is achieved in the four-fugacity model, the condition of equilibrium between air and aerosols will be no longer valid.

Chemosphere published new progress about Aerosols. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, HPLC of Formula: 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Azeem, Hafiz Abdul published the artcileExtending the scope of dispersive liquid-liquid microextraction for trace analysis of 3-methyl-1,2,3-butanetricarboxylic acid in atmospheric aerosols leading to the discovery of iron(III) complexes, Recommanded Product: n-Octanol, the main research area is dispersive liquid microextraction trace analysis methylbutanetricarboxylic acid; atm aerosol iron complex monoterpene complexation vegetation; Biogenic secondary organic aerosol; Dispersive liquid–liquid microextraction; MBTCA; Metal complexes; Trace analysis.

3-Methyl-1,2,3-butanetricarboxylic acid (MBTCA) is a secondary organic aerosol and can be used as a unique emission marker of biogenic emissions of monoterpenes. Seasonal variations and differences in vegetation cover around the world may lead to low atm. MBTCA concentrations, in many cases too low to be measured. Hence, an important tool to quantify the contribution of terrestrial vegetation to the loading of secondary organic aerosol may be compromised. To meet this challenge, a dispersive liquid-liquid microextraction (DLLME) method, known for the extraction of hydrophobic compounds, was extended to the extraction of polar organic compounds like MBTCA without compromising the efficiency of the method. The extraction solvent was fine-tuned using tri-n-octyl phosphine oxide as additive. A multivariate exptl. design was applied for deeper understanding of significant variables and interactions between them. The optimum extraction conditions included 1-octanol with 15% tri-n-octyl phosphine oxide (weight/weight) as extraction solvent, MeOH as dispersive solvent, 25% NaCl dissolved in 5 mL sample (weight/weight) acidified to pH 2 using HNO3, and extraction time of 15 min. A limit of detection of 0.12 pg/m3 in air was achieved. Also, unique complexation behavior of MBTCA with Fe(III) was found when analyzed with ultra-HPLC coupled with electrospray ionization-quadrupole time-of-flight mass spectrometry (UHPLC-ESI-QToF). A comprehensive overview of this complexation behavior of MBTCA was examined with systematically designed experiments This newly discovered behavior of MBTCA will be of interest for further research on organometallic photooxidation chem. of atm. aerosols.

Analytical and Bioanalytical Chemistry published new progress about Aerosols. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Cai, Qinhong published the artcileA cross-comparison of biosurfactants as marine oil spill dispersants: Governing factors, synergetic effects and fates, Related Products of alcohols-buliding-blocks, the main research area is biosurfactant oil spill dispersant synergetic effect biodegradation wastewater treatment; Biosurfactant-based dispersants; Exmulsins; Oil spill dispersion; Surfactins; Trehalose lipids.

Biosurfactant-based dispersants (BBDs) may be more effective, cost-efficient and environmentally friendly than dispersants currently used for oil spill response. An improved understanding of BBD performance is needed to advance their development and com. use. In this study, the ability of four BBDs, i.e. sufactins, trehalose lipids, rhamnolipids and exmulsins, alone and as various combinations to disperse Arabian light crude oil and weathered Alaska North Slope crude oil was compared to a widely used com. oil dispersant (Corexit 9500A). Surfactin and trehalose lipids, which have balanced surface activity/emulsification ability, showed dispersion efficacy comparable to Corexit 9500A. Rhamnolipids (primarily a surface-active agent) and exmulsins (primarily an emulsifier) when used alone had significantly lower efficacy. However, blends of these surfactants had excellent dispersion performance because of synergistic effects. Balanced surface activity and emulsification ability may be key to formulate effective BBDs. Of the BBDs evaluated, surfactins with an effective dispersant-to-oil ratio as low as 1:62.3 and trehalose lipids with high oil affinity, biodegradation rate, and low toxicity characteristics show the most promise for com. development.

Journal of Hazardous Materials published new progress about Affinity. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Xu, Yanting published the artcileCorrosion degree evaluation and leakage judgment of vertical storage tanks by AE test, Product Details of C8H18O, the main research area is vertical storage tank leakage judgment acoustic emission corrosion degree.

Acoustic emission (AE) testing has gradually been applied to the online inspection and safety evaluation of the vertical storage tank bottom, but the evaluation is mainly qual., and it is difficult to evaluate the nature of the sound source (corrosion or leakage), so its application and effect are limited. A preliminary severity evaluation of corrosion defects was made, and the nature of acoustic sources was screened in this paper with confirmed AE testing cases of tank bottoms as reference samples, and the concept of similar evaluation method based on event rate and graphical features was put forward. With more experience and further research in this field and in the future, a simple and effective method for corrosion degree evaluation and defect property identification will be developed.

Springer Proceedings in Physics published new progress about Corrosion. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Product Details of C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Sanchez M., Jhon F. published the artcileProduction of Pd nanoparticles in microemulsions. Effect of reaction rates on the particle size, Computed Properties of 111-87-5, the main research area is palladium nanoparticle microemulsion reaction rate particle size.

In the synthesis of metallic nanoparticles in microemulsions, we hypothesized that the particle size is controlled by the reaction rate and not by the microemulsion size. Thus, the changes observed in the particle sizes as reaction conditions, such as concentrations, temperatures, the type of surfactant used, etc., are varied which should not be correlated directly to the modification of these conditions but indirectly to the changes they produce in the reaction rates. In this work, the microemulsions were formulated with benzene and water as continuous and dispersed phases, resp., using n-dodecyltrimethylammonium bromide (DTAB) and n-octanol as the surfactant and cosurfactant. Using time-resolved UV-vis spectroscopy, we measured the reaction rates in the production of palladium (Pd) nanoparticles inside the microemulsions at different reactant concentrations and temperatures, keeping all the other parameters constant The measured reaction rates were then correlated with the particle sizes measured by transmission electron microscopy (TEM). We found that the nanoparticle size increases linearly as the reaction rate increases, independently of the actual reactant concentration or temperature We proposed a simple model for the observed kinetics where the reaction rate is controlled mainly by the diffusion of the reducing agent. With this model, we predicted that the particle size should depend indirectly, via the reaction kinetics, on the micelle radius, the water volume and the total microemulsion volume Some of these predictions were indeed observed and reported in the literature.

Physical Chemistry Chemical Physics published new progress about Diffusion. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Computed Properties of 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Cai, Teddy X. published the artcileA single-shot measurement of time-dependent diffusion over sub-millisecond timescales using static field gradient NMR, Computed Properties of 111-87-5, the main research area is diffusion static field gradient NMR chem shift.

Time-dependent diffusion behavior is probed over sub-millisecond timescales in a single shot using a NMR static gradient time-incremented echo train acquisition (SG-TIETA) framework. The method extends the Carr-Purcell-Meiboom-Gill cycle under a static field gradient by discretely incrementing the π-pulse spacings to simultaneously avoid off-resonance effects and probe a range of timescales (50-500μs). Pulse spacings are optimized based on a derived ruleset. The remaining effects of pulse inaccuracy are examined and found to be consistent across pure liquids of different diffusivities: water, decane, and octanol-1. A pulse accuracy correction is developed. Instantaneous diffusivity, Dinst(t), curves (i.e., half of the time derivative of the mean-squared displacement in the gradient direction) are recovered from pulse accuracy-corrected SG-TIETA decays using a model-free log-linear least squares inversion method validated by Monte Carlo simulations. A signal-averaged 1-min experiment is described. A flat Dinst(t) is measured on pure dodecamethylcyclohexasiloxane, whereas decreasing Dinst(t) is measured on yeast suspensions, consistent with the expected short-time Dinst(t) behavior for confining microstructural barriers on the order of micrometers. (c) 2021 American Institute of Physics.

Journal of Chemical Physics published new progress about Diffusion. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Computed Properties of 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts