scholarly journals Synthesis and Characterisation of Metal Oxide Nanostructures Using Choline/Linear Alkyl Carboxylate Deep Eutectic Solvents

Solids ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 31-46
Author(s):  
Omar Gómez Rojas ◽  
Tadachika Nakayama
Keyword(s):  
Metal Oxide ◽  
Butyric Acid ◽  
Deep Eutectic Solvents ◽  
Decanoic Acid ◽  
Nonanoic Acid ◽  
Pentanoic Acid ◽  
Molar Ratios ◽  
Metal Nitrates ◽  
Synthetic Media ◽  
Phase Percentage

The synthesis of YBa2Cu3O7−x (YBCO or 123) was carried out via the use of a variety of deep eutectic solvents (DESs), all formed by the interaction of choline hydroxide (as the cation source) and alkyl carboxylic acids with CnH2n+1 ranging from n = 2 to n = 10, namely acetic acid, propionic acid, butyric acid, pentanoic acid, nonanoic acid, and decanoic acid, as providers of the anion, all prepared in equimolar solutions. The behaviour of the synthetic media and the resulting morphology displayed by the crystallite product, using different molar ratios of DESs (X):1 YBaCu metal nitrates mixes, with x values of 20 ≤ x ≤ 60, is also reported. Synthetic performance results show a tendency to generate higher total phase percentage of the desired crystal with the increase of the alkyl chain length of the carboxylic acid up to butyric acid (92% belonging to the metal oxide), after which no enhancement was observed. Furthermore, the synthetic performance of the remaining, i.e., DES formed with pentanoic acid to decanoic acid, displayed a constant decay in total desired phase percentage belonging to the metal oxide. Morphological results were also analysed for all DESs (X):1 YBaCu metal nitrates mixes, with x values of 20 ≤ x ≤ 60. Well defined plate-like particles were generally observed however, in some cases fused plate-like particles of significantly bigger size were observed.

scholarly journals Synthesis of Metal Oxide Inverse Opals from Metal Nitrates by PMMA Colloidal Crystal Templating

2020 ◽  
Author(s):  
Xuyang Zhang ◽  
Christian Weinberger ◽  
Sabrina Amrehn ◽  
Xia Wu ◽  
Michael Tiemann ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Colloidal Crystal ◽  
Inverse Opals ◽  
Metal Nitrates ◽  
Colloidal Crystal Templating

Associative learning for host-induced fruit volatiles in Psyttalia concolor (Hymenoptera: Braconidae), a koinobiont parasitoid of tephritid flies

2014 ◽  
Vol 104 (6) ◽  
pp. 774-780 ◽  
Author(s):  
A. Canale ◽  
S. Geri ◽  
G. Benelli
Keyword(s):  
Associative Learning ◽  
Food Reward ◽  
Decanoic Acid ◽  
Nonanoic Acid ◽  
Parasitic Wasps ◽  
Wide Range ◽  
Geranyl Acetone ◽  
Odour Learning ◽  
Psyttalia Concolor ◽  
Key Resources

AbstractParasitic wasps are fascinating organisms that rely on a wide range of communication channels to locate their hosts. Associative learning for foraging kairomones has been demonstrated for various parasitic wasps, but little is known for parasitoids of Tephritidae flies. Psyttalia concolor (Hymenoptera: Braconidae) is a koinobiont parasitoid able to attack at least 14 tephritid pests. Females are innately attracted by some host-induced plant volatiles (HIPVs), whereas others of the same bouquet are unattractive. We hypothesize that females may detect unattractive HIPVs in association with key resources, such as food and hosts, learning to respond favourably to these cues in consecutive experiences. We evaluated associative learning for HIPVs in P. concolor females, testing if they are able to associate a food reward with the presence of different dosages of three HIPVs, thus developing a preference for an odour innately unattractive. Results demonstrated that P. concolor responded favourably to the learned cue in consecutive experiences. For all tested HIPVs (nonanoic acid, decanoic acid and geranyl acetone), regardless of dosage, trained females preferred the reward-associated odour, whereas naïve did not. Both HIPV-trained and naïve females did not show consistent differences in latencies when choosing HIPVs over blank. HIPV-trained and naïve wasps did not spend more time on HIPVs over blank. Odour learning is of adaptive importance for this generalist parasitoid, since it enhances host location efficiency by reducing the time wasted on the decision of where to search for hosts. From an applied perspective, these HIPVs could be used to train mass-reared P. concolor in pre-release, to potentially improve its efficacy in the field.

INHIBITION OF LACTIC STREPTOCOCCI AND SOME PATHOGENIC BACTERIA BY CERTAIN MILK-ASSOCIATED VOLATILE COMPOUNDS AS MEASURED BY THE DISC ASSAY1

1970 ◽  
Vol 33 (8) ◽  
pp. 305-310 ◽  
Author(s):  
D. C. Kulshrestha ◽  
E. H. Marth
Keyword(s):  
Formic Acid ◽  
Volatile Compounds ◽  
Butyric Acid ◽  
Pathogenic Bacteria ◽  
Decanoic Acid ◽  
Hexanoic Acid ◽  
E Coli ◽  
Assay Procedure ◽  
Disc Assay ◽  
Test Cultures

Twenty-seven milk-associated volatile compounds were tested with the disc assay procedure for their ability to inhibit Streptococcus cremoris, Streptococcus lactis, Streptococcus diacetilactis, Leuconostoc citrovorum, Escherichia coli, Salmonella typhimurium, and Staphylococcus aureus. Anisaldehyde, butyraldehyde, formaldehyde, glyoxal, diacetyl, butyric acid, decanoic acid, formic acid, hexanoic acid, octanoic acid, hexylamine, and propylamine inhibited all test cultures although frequently only at concentrations of 10,000 and 100,000 ppm. In addition, isobutyraldehyde (100,000 ppm) inhibited L. citrovorum, E. coli, S. typhimurium, and S. aureus and acetaldehyde (100,000 ppm) inhibited S. aureus. Compounds most active (inhibition at 1,000 ppm) against S. lactis, L. citrovorum, and S. aureus were formaldehyde, glyoxal, and decanoic acid; against S. cremoris were formaldehyde, butyric acid, decanoic acid, formic acid, and hexanoic acid; against one strain of S. diacetilactis were glyoxal, diacetyl, and decanoic acid; against another strain of S. diacetilactis were formaldehyde, decanoic acid, and formic acid; against E. coli were formaldehyde and formic acid; and against S. typhimurium were formaldehyde, diacetyl, butyric acid, formic acid, and hexanoic acid. At a concentration of 1,000 ppm formaldehyde inhibited all test cultures except the fast acid-producing S. diacetilactis and decanoic acid all but E. coli and S. typhimurium. The disc assay procedure was unsatisfactory for evaluating highly volatile compounds since they evaporated before adequate diffusion into the agar occurred.

ChemInform Abstract: Direct Thermal Decomposition of Metal Nitrates in Octadecylamine to Metal Oxide Nanocrystals.

ChemInform ◽  
2008 ◽  
Vol 39 (23) ◽  
Author(s):  
Ding-Sheng Wang ◽  
Ting Xie ◽  
Qing Peng ◽  
Shao-Yan Zhang ◽  
Jun Chen ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Metal Oxide ◽  
Metal Nitrates

Effect of pH, Molar Ratio of Fuel to Nitrates and Calcination Temperature on the Glycine-Nitrate Synthesis of Nano CoAl2O4

2010 ◽  
Vol 68 ◽  
pp. 176-181 ◽  
Author(s):  
Seyyed Hamid Jazayeri ◽  
Federica Bondioli ◽  
Shiva Salem ◽  
Ali Allahverdi ◽  
Mansoor Shirvani ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Calcination Temperature ◽  
Specific Surface Area ◽  
Precursor Solution ◽  
Molar Ratio ◽  
Effect Of Ph ◽  
Molar Ratios ◽  
Metal Nitrates ◽  
Powder Characteristics

In this research, solution-based combustion synthesis is applied to prepare the spinel CoAl2O4 pigment from precursor solution of Al(NO3)3 .9H2O, Co(NO3)2 .6H2O and glycine. Effect of pH values (2.5, 7, 10.5), molar ratio of fuel to metal nitrates in the precursor solutions (1.5, 2) and subsequent calcination temperature (800, 1000, 1200 °C) on the powder characteristics are described. Gel formation, morphologies, specific surface area and colour of the powder are characterized using DTA/TG, XRD, TEM, BET and UV-Vis. The results indicate that the crystalline spinel CoAl2O4 is formed at all different Gl/(metal nitrates) molar ratios, pH and temperatures and higher temperature promote the increase of the crystallite size. According to TEM figures most of the particles calcined at 800 and 1000 °C has sizes less than 50 and 100 nm, respectively. Corresponding to results of BET experiment, specific surface area has its maximum values at pH 7 and decreases with increasing of temperature. Finally, colorability test indicates the complete stability of the synthesized powder in the glass matrix.

Hydrophobic deep eutectic solvents as water-immiscible extractants

2015 ◽  
Vol 17 (9) ◽  
pp. 4518-4521 ◽  
Author(s):  
Dannie J.G.P. van Osch ◽  
Lawien F. Zubeir ◽  
Adriaan van den Bruinhorst ◽  
Marisa A.A. Rocha ◽  
Maaike C. Kroon
Keyword(s):  
Quaternary Ammonium ◽  
Deep Eutectic Solvents ◽  
Decanoic Acid ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts

Hydrophobic deep eutectic solvents consisting of decanoic acid and various quaternary ammonium salts are presented and evaluated as extractants.

Unassisted visible solar water splitting with efficient photoelectrodes sensitized by quantum dots synthesized via an environmentally friendly eutectic solvent-mediated approach

2018 ◽  
Vol 6 (45) ◽  
pp. 22566-22579 ◽  
Author(s):  
Uma V. Ghorpade ◽  
Mahesh P. Suryawanshi ◽  
Seung Wook Shin ◽  
Jihun Kim ◽  
Soon Hyung Kang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Water Splitting ◽  
Choline Chloride ◽  
Environmentally Friendly ◽  
Deep Eutectic Solvents ◽  
Colloidal Quantum Dots ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Synthetic Media

Deep eutectic solvents (DESs) based on choline chloride/ethylene glycol have been explored as synthetic media for Cu–Sb–S based colloidal quantum dots for unassisted solar water splitting.

Anhydrous Metal Nitrates as Volatile Single Source Precursors for the CVD of Metal Oxide Films

1998 ◽  
Vol 04 (06) ◽  
pp. 220-222 ◽  
Author(s):  
Daniel G. Colombo ◽  
David C. Gilmer ◽  
Victor G. Young Jr. ◽  
Stephen A. Campbell ◽  
Wayne L. Gladfelter
Keyword(s):  
Metal Oxide ◽  
Oxide Films ◽  
Single Source ◽  
Metal Oxide Films ◽  
Single Source Precursors ◽  
Metal Nitrates

scholarly journals Amino Acid-Based Natural Deep Eutectic Solvents for Extraction of Phenolic Compounds from Aqueous Environments

Processes ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1716
Author(s):  
Meiyu Li ◽  
Yize Liu ◽  
Fanjie Hu ◽  
Hongwei Ren ◽  
Erhong Duan
Keyword(s):  
Reaction Time ◽  
Industrial Development ◽  
High Efficiency ◽  
Deep Eutectic Solvents ◽  
Decanoic Acid ◽  
Molar Ratio ◽  
Infrared Spectrometry ◽  
Good Thermal Stability ◽  
Phenol Extraction ◽  
Natural Deep Eutectic Solvents

The environmental pollution of phenol-containing wastewater is an urgent problem with industrial development. Natural deep eutectic solvents provide an environmentally friendly alternation for the solvent extraction of phenol. This study synthesized a series of natural deep eutectic solvents with L-proline and decanoic acid as precursors, characterized by in situ infrared spectrometry, Fourier transform infrared spectrometry, hydrogen nuclear magnetic resonance spectrometry, and differential thermogravimetric analysis. Natural deep eutectic solvents have good thermal stability. The high-efficiency extraction of phenol from wastewater by natural deep eutectic solvents was investigated under mild conditions. The effects of natural deep eutectic solvents, phenol concentration, reaction temperature, and reaction time on phenol extraction were studied. The optimized extraction conditions of phenol with L-prolin/decanoic acid were as follows: molar ratio, 4.2:1; reaction time, 60 min; and temperature, 50 °C. Extraction efficiency was up to 62%. The number of extraction cycles can be up to 6, and extraction rate not less than 57%. The promising results demonstrate that natural deep eutectic solvents are efficient in the field of phenolic compound extraction in wastewater.

scholarly journals Structure and Hydrogen Bonds of Hydrophobic Deep Eutectic Solvent-Aqueous Liquid-Liquid Interfaces

2021 ◽  
Author(s):  
Usman Abbas ◽  
Qi Qiao ◽  
Manh Tien Nguyen ◽  
Jian Shi ◽  
Qing Shao
Keyword(s):  
Dipole Moment ◽  
Hydrogen Bonds ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Decanoic Acid ◽  
Structural Features ◽  
Liquid Interface ◽  
Organic Substrates ◽  
Liquid Interfaces ◽  
Extraction Ability

Hydrophobic deep eutectic solvents (DESs) emerge as candidates to extract organic substrates from aqueous solutions. The DES-aqueous liquid-liquid interface plays a vital role in the extraction ability of hydrophobic DES because the non-bulk structure of molecules at the interface could cause thermodynamic and kinetic barriers. One question is how the DES compositions affect the structural features of the DES-aqueous liquid-liquid interface. We investigate the density profile, dipole moment and hydrogen bonds of eight hydrophobic DES-aqueous liquid-liquid interfaces using molecular dynamics simulations. The eight DESs are composed of four organic compounds: decanoic acid, menthol, thymol, and lidocaine. The simulation results show the variations of dipole moment and hydrogen bond structure and dynamics at the liquid-liquid interfaces. Such variations could influence the extraction ability of DES through adjusting the partition and kinetics of organic substrates in the DES-aqueous biphasic systems.

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