Month: December 2022

Qin, Junhao published the artcileArsenic in leafy vegetable plants grown on mine water-contaminated soils: Uptake, human health risk and remedial effects of biochar, Recommanded Product: (S)-2-hydroxysuccinic acid, the main research area is arsenic vegetable health risk mine contaminated soil biochar remediation; Acidic mine water; Arsenic; Biochar; Human health risk; Leafy vegetable.

Field investigation and microcosm experiment were conducted to examine the uptake of arsenic by vegetable plants grown on the soils contaminated by acidic mine water and evaluate the human health risk from consuming the vegetables. Plant uptake of arsenic was related to the ratio of phosphorus to arsenic in soil solution for the same vegetable species. Bioaccumulation coefficient (BAC) of arsenic was highly variable amongst the different vegetable species with water spinach (white stem) and sweet potato leaf being identified as major vegetable species with high BAC. There was a reasonably good relationship between the gastric phase-bioaccessible arsenic and the gastrointestinal phase-bioaccessible arsenic. Consumption of the vegetables grown in the investigated area poses a significantly potential human health risk with a hazard quotient (HQ) of 2.7. Application of biochar significantly inhibited the uptake of arsenic by the vegetable plant due to protonation of biochar surfaces under acidic conditions, which favored adsorption of arsenic. The bioaccessibity of arsenic in the edible part of vegetable was also reduced due to biochar application. The HQ of the test vegetable plant (Gynura cusimbua) after soil amendment by biochar was reduced to 2 from 6 for the unamended soil.

Journal of Hazardous Materials published new progress about Allium cepa. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Recommanded Product: (S)-2-hydroxysuccinic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kiss, Nora Zsuzsa published the artcileContinuous flow esterification of a H-phosphinic acid, and transesterification of H-phosphinates and H-phosphonates under microwave conditions, Related Products of alcohols-buliding-blocks, the main research area is continuous flow esterification phosphinic acid phosphonate transesterification; H-phosphinates; H-phosphinic acid; H-phosphonates; esterification; microwave flow reactor; transesterification.

The microwave (MW)-assisted direct esterification of phenyl-H-phosphinic acid, transesterification of the alkyl phenyl-H-phosphinates so obtained, and the similar reaction of dibenzyl phosphite (DBP) were investigated in detail, and the batch accomplishments were translated into a continuous flow operation that, after optimization of the parameters, such as temperature and flow rate, proved to be more productive. Alcoholysis of DBP is a two-step process involving an intermediate phosphite with two different alkoxy groups. The latter species are of synthetic interest, as precursors for optically active reagents.

Molecules published new progress about Alcoholysis. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Koo, Jahyeon published the artcilePolarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is polarized light emission uniaxially oriented polyogen dicyanodistyrylbenzene croslsinked; polymer luminogens aggregation emission.

Organic materials with linearly polarized luminescence (LPL) properties and good processability are critical to the development of advanced optical devices. To fabricate polymer-stabilized thin films with LPL properties, dicyanodistyrylbenzene-based reactive luminogens (abbreviated as DRL) containing both vinyl and thiol units were newly synthesized. On the basis of morphol. observations combined with thermal and scattering analyses, it was found that DRL has a nematic liquid crystal mesophase. DRL mols. were uniaxially oriented by surface alignment layer and stabilized by thiol-ene click reaction. Uniaxially oriented and polymer-stabilized DRL thin films showed excellent chem. resistance as well as mech. and thermal stability due to the chem. crosslinked polymer network. The DRL polymer film exhibited strong emission at 564 nm with remarkable LPL property. The polymer-stabilized films obtained from reactive luminogens with aggregation-induced enhanced emission (AIEE) properties have great potential for the application of advanced optical devices.

Macromolecules (Washington, DC, United States) published new progress about Aggregation. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liao, Lieqiang published the artcileSupramolecular organogels fabricated with dicarboxylic acids and primary alkyl amines: controllable self-assembled structures, Related Products of alcohols-buliding-blocks, the main research area is supramol organogel dicarboxylic acid primary alkyl amine.

Supramol. organogels are soft materials comprised of low-mol.-mass organic gelators (LMOGs) and organic liquids Owning to their unique supramol. structures and potential applications, LMOGs have attracted wide attention from chemists and biochemists. A new “”superorganogel”” system based on dicarboxylic acids and primary alkyl amines (R-NH2) from the formation of organogels is achieved in various organic media including strong and weak polar solvents. The gelation properties of these gelators strongly rely on the mol. structure. Their aggregation morphol. in the as-obtained organogels can be controlled by the solvent polarity and the tail chain length of R-NH2. Interestingly, flower-like self-assemblies can be obtained in organic solvents with medium polarity, such as THF, pyridine and dichloromethane, when the gelators possess a suitable length of carbon chain. Moreover, further analyses of Fourier transformation IR spectroscopy and 1H NMR spectroscopy reveal that the intermol. acid-base interaction and van der Waals interaction are critical driving forces in the process of organogelation. In addition, this kind of organogel system displays excellent mech. properties and thermo-reversibility, and its forming mechanism is also proposed.

RSC Advances published new progress about Aggregation. 110-99-6 belongs to class alcohols-buliding-blocks, name is 2,2′-Oxydiacetic acid, and the molecular formula is C4H6O5, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Chen, Yi-Ru published the artcileLong-Range Self-Assembly of an Electron-Deficient Hexaazatrinaphthylene with Out-of-Plane Substituents, Application In Synthesis of 584-02-1, the main research area is soft crystal; charge transport; hexaazatrinaphthylenes; liquid crystals; self-assembly; supramolecular chemistry.

The unprecedented time-dependent long-range supramol. assembly of electron-deficient hexaazatrinaphthylene (HATN) core based on peripheral crowding with three out-of-plane cyclic ketals is reported. The single-crystal X-ray structure of the di-Et derivative provided detailed information as to how four mols. in a repeating unit were packed in order to avoid steric crowding of the out-of-plane cyclic ketal side chain, providing locking and fastening for stabilizing the self-assembled structure. The polarizing optical microscopy (POM) and differential scanning calorimetry (DSC) did not instantaneously show any phase transition upon the cooling process. To our surprise, POM images showed a nucleation of spherulite up to 100μm after 24 h later. X-ray diffraction data further confirmed that these soft crystal formed a hexagonal-like crystal. The long-range self-assembly of the new material showed a slight red shift in the UV-vis absorption spectra and further substantiated by computational method.

ChemPlusChem published new progress about Aggregation. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Application In Synthesis of 584-02-1.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Iakovleva, Ekaterina A. published the artcileAggregates of Ethoxylated Surfactant with Added n-Octanol: Details of Corona Structure from a Molecular-Thermodynamic Model, Product Details of C8H18O, the main research area is octanol ethoxylated surfactant aggregate corona structure thermodn model.

Polar heads of many nonionic surfactants have complex chem. structure. In the micellar aggregates these heads are engaged in specific and nonspecific interactions with one another and with the hydration water. We present here a mol.-thermodn. aggregation model that takes into account explicitly the hydrogen bonding and other specific interactions within the hydrated corona of a mixed nonionic aggregate. Apart from the aggregation characteristics that are usually obtained from the classical aggregation models – critical micelle concentration (CMC), the distribution of the aggregates over the size and shape and their composition – our model helps to establish a number of likely details of structure, including the corona thickness, hydration, and the partial penetration of the micelle components in the corona region. In this work the model is applied to describe the aggregation equilibrium in aqueous solutions of nonionic surfactants of the polyoxyethylene-p-(1,1,3,3-tetramethylbutyl)phenyl ether family that is closely related to Tritons, the com. surfactants of an extensive practical use. The model gives reasonable estimates of the CMCs and predicts correctly the trends in CMC and in the aggregation numbers vs the number of oxyethylene groups in the surfactant mol. The hydration numbers and the fraction of water engaged in hydrogen bonds are calculated For the hydration of the aggregate coronae, the predicted trend is in line with that found for other ethoxylated nonionic surfactants: poly(ethylene oxide) alkyl ethers and neonols. For surfactant solutions with added n-octanol, the model suggests that the tails of the octanol mols. are deeply buried in the cores of the mixed micelles with only one methylene group penetrating the coronae. We predict co-surfactant effect of added n-octanol: the depression of the CMCs is progressively stronger for more hydrophilic surfactants with larger EO heads.

Fluid Phase Equilibria published new progress about Aggregation. 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

Vazquez-Tato, M. Pilar published the artcileHighly Hydrophilic and Lipophilic Derivatives of Bile Salts, Computed Properties of 111-87-5, the main research area is bile salt hydrophilicity lipophilicity heat capacity partition coefficient; bile acids and salts; demicellization thermodynamics; hydrophilic-lipophilic balance; isothermal titration calorimetry; lipophilicity; partition coefficient.

Lipophilicity of 15 derivatives of sodium cholate, defined by the octan-1-ol/water partition coefficient (log P), has been theor. determined by the Virtual log P method. These derivatives bear highly hydrophobic or highly hydrophilic substituents at the C3 position of the steroid nucleus, being linked to it through an amide bond. The difference between the maximum value of log P and the min. one is enlarged to 3.5. The partition coefficient and the critical micelle concentration (cmc) are tightly related by a double-logarithm relationship (VirtuallogP=-(1.00 ±0.09)log(cmcmM)+(2.79±0.09)), meaning that the Gibbs free energies for the transfer of a bile anion from water to either a micelle or to octan-1-ol differ by a constant The equation also means that cmc can be used as a measurement of lipophilicity. The demicellization of the aggregates formed by three derivatives of sodium cholate bearing bulky hydrophobic substituents has been studied by surface tension and isothermal titration calorimetry. Aggregation numbers, enthalpies, free energies, entropies, and heat capacities, δCP,demic, were obtained. δCP,demic, being pos., means that the interior of the aggregates is hydrophobic.

International Journal of Molecular Sciences published new progress about Aggregation. 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

Xu, Huilong published the artcileRheology of end-linking polydimethylsiloxane networks filled with silica, Application In Synthesis of 7575-23-7, the main research area is rheol polydimethylsiloxane network filled silica.

Filled vulcanizates exhibit the nonlinear Payne effect under dynamic deformations at high strain amplitudes, while the underlining mechanisms are still in dispute. Herein, polydimethylsiloxane (PDMS) networks are prepared via end-linking of α,ω-vinyl-terminated PDMS chains by the thiol-ene reaction, and the influences of silica on the dynamic rheol. responses are investigated. The presence of silica tends to improve the crosslinking d. alongside reinforcing the network, while silica itself does not contribute to the loss factor markedly. Furthermore, silica could promote the onset strain amplitude of the Payne effect and manifest the very weak overshoot of loss modulus near the onset amplitude. By creating master curves of the Payne effect of the filled vulcanizates referenced to the end-linking networks, it is evidenced that this effect and the accompanied weak overshoot are mainly rooted in the nonlinear Rouse dynamics of the network strands. (c) 2020 American Institute of Physics.

Journal of Rheology (Melville, NY, United States) published new progress about Aggregation. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Luan, Zhongyue published the artcileReversible Aggregation of Covalently Cross-Linked Gold Nanocrystals by Linker Oxidation, Quality Control of 7575-23-7, the main research area is gold nanocrystal aggregation thiol oxidation ligand.

Covalent crosslinking of colloidal gold nanocrystals (Au NCs) with dithiol mols. is normally considered to be an irreversible self-assembly process. Left unchecked, dithiol-mediated aggregation results in the uncontrolled formation of polymeric NC-dithiolate precipitates Here we demonstrate the reversible assembly and disassembly of dithiolate-linked precipitates and colloidal aggregates of Au NCs by oxidizing the dithiolate linkers with ozone. Destruction of the linkers results in the complete depolymerization of the NC aggregates/precipitates to re-form stable aqueous colloids of individual Au NCs with retention of the original NC size distribution. The process is repeatable by adding addnl. dithiol to reinitiate aggregation, although some irreversible fusion of the NCs occurs in subsequent cycles. This method for reversible self-assembly of covalently cross-linked Au NCs is simple, clean, reproducible, and effective for a variety of linkers. Extending reversibility to covalently bound NC assemblies creates new possibilities in plasmonic sensing and catalysis.

Journal of Physical Chemistry C published new progress about Aggregation. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Quality Control of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Pozar, Martina published the artcileOn the X-ray Scattering Pre-peak of Linear Mono-ols and the Related Microstructure from Computer Simulations, Related Products of alcohols-buliding-blocks, the main research area is X ray scattering linear aliphatic alc microstructure computer simulation.

The X-ray scattering intensities (I(k)) of linear alkanols OH(CH2)n-1CH3 obtained from experiments (methanol to 1-undecanol) and computer simulations (methanol to 1-nonanol) of different force field models are comparatively studied particularly in order to explain the origin and the properties of the scattering pre-peak in the k-vector range 0.3-1 Å-1. The exptl. I(k) values show two apparent features: the pre-peak position kP decreases with increasing n, and more intriguingly, the amplitude AP goes through a maximum at 1-butanol (n = 4). The first feature is well reproduced by all force-field models, while the second shows strong model dependence. The simulations reveal various shapes of clusters of the hydroxyl head-group from n > 2. KP is directly related to the size of the meta-objects corresponding to such clusters surrounded by their alkyl tails. The explanation of the AP turnover at n = 4 is more involved in terms of cancellations of atom-atom structure factor S(k) contributions related to domain ordering. The flexibility of the alkyl tails tends to reduce the cross contributions, thus revealing the crucial importance of this parameter in the models. Force fields with all-atom representation are less successful in reproducing the pre-peak features for smaller alkanols, n < 6, possibly because they blur the charge ordering process since all atoms bear partial charges. The anal. clearly shows that it is not possible to obtain a model-free explanation of the features of I(k). Journal of Physical Chemistry B published new progress about Aggregation. 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