Acid Assisted Synthesis of HB Sheets through Exfoliation of MgB2 Bulk in Organic Media

2020 ◽  
Vol 49 (10) ◽  
pp. 1194-1196
Author(s):  
Reiya Kawamura ◽  
Akira Yamaguchi ◽  
Chika Shimada ◽  
Ryota Ishibiki ◽  
Takeshi Fujita ◽  
...  
Keyword(s):  
Organic Media ◽  
Mgb2 Bulk

Supramolecular Assembly of U(IV) Clusters and Superatoms

2020 ◽  
Author(s):  
Ian Colliard ◽  
Gregory Morrosin ◽  
Hans-Conrad zur Loye ◽  
May Nyman
Keyword(s):  
Quantum Dots ◽  
Supramolecular Assembly ◽  
Emergent Properties ◽  
Organic Media ◽  
Body Centered Cubic ◽  
Cluster Anions ◽  
Charge Balance ◽  
Interpenetrating Networks ◽  
Hierarchical Assembly ◽  
Two Parameters

Superatoms are nanometer-sized molecules or particles that can form ordered lattices, mimicking their atomic counterparts. Hierarchical assembly of superatoms gives rise to emergent properties in superlattices of quantum-dots, p-block clusters, and fullerenes. Here, we introduce a family of uranium-oxysulfate cluster anions whose hierarchical assembly in water is controlled by two parameters; acidity and the countercation. In acid, larger Ln<sup>III</sup> (Ln=La-Ho) link hexamer (U<sub>6</sub>) oxoclusters into body-centered cubic frameworks, while smaller Ln<sup>III</sup> (Ln=Er-Lu &Y) promote linking of fourteen U<sub>6</sub>-clusters into hollow superclusters (U<sub>84</sub> superatoms). U<sub>84</sub> assembles into superlattices including cubic-closest packed, body-centered cubic, and interpenetrating networks, bridged by interstitial countercations, and U<sub>6</sub>-clusters. Divalent transition metals (TM=Mn<sup>II </sup>and Zn<sup>II</sup>), with no added acid, charge-balance and promote the fusion of 10 U<sub>6</sub> and 10 U-monomers into a wheel–shaped cluster (U<sub>70</sub>). Dissolution of U<sub>70</sub> in organic media reveals (by small-angle Xray scattering) that differing supramolecular assemblies are accessed, controlled by TM-linking of U<sub>70</sub>-clusters. <br>

Technological capabilities of vibration fi nishing of parts by granular organic media from natural materials

2020 ◽  
pp. 407-410
Author(s):  
E.Yu. Krupenya ◽  
A.P. Shishkina
Keyword(s):  
Experimental Verification ◽  
Organic Media ◽  
Technological Capabilities ◽  
Natural Materials ◽  
Machine Parts ◽  
Parts Manufacturing

The essence and scope of granular organic media from natural materials in the technology for machine parts manufacturing are shown. Vibration finishing model of the parts surface by granules of stone organic media and the results of its experimental verification, features of drying and vibration wiping of parts by organic media are presented.

scholarly journals Molecular sieving using metal–polymer coordination membranes in organic media

2021 ◽  
Author(s):  
Rifan Hardian ◽  
Peter Pogany ◽  
Young Moo Lee ◽  
Gyorgy Szekely
Keyword(s):  
Chemical Resistance ◽  
Organic Media ◽  
Nanofiltration Membranes ◽  
Molecular Sieving ◽  
Metal Polymer

Improving the chemical resistance of membranes without sacrificing their molecular sieving performance is highly challenging. Herein, a novel scalable methodology was developed for fabricating solvent-resistant nanofiltration membranes based on metal–polymer...

Insights into the Extraction of Photogenerated Holes from CdSe/CdS Nanorods for Oxidative Organic Catalysis

2021 ◽  
Author(s):  
Yuchen Sha ◽  
Xiao-Min Lin ◽  
Jens Niklas ◽  
Oleg Poluektov ◽  
Benjamin T Diroll ◽  
...  
Keyword(s):  
Oxidative Coupling ◽  
Model Reaction ◽  
Core Shell ◽  
Organic Media ◽  
Cds Nanorods ◽  
Organic Catalysis

Using aerobic oxidative coupling of thiolphenol in organic media as a model reaction, we show that photogenerated holes in CdSe/CdS core-shell nanorods can be efficiently exctracted. As a result, CdSe/CdS...

scholarly journals Biosurfactants from Trichoderma Filamentous Fungi—A Preliminary Study

Biomolecules ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 519
Author(s):  
Michał Piegza ◽  
Joanna Pietrzykowska ◽  
Joanna Trojan-Piegza ◽  
Wojciech Łaba
Keyword(s):  
Filamentous Fungi ◽  
Chemical Nature ◽  
Culture Fluid ◽  
Medium Composition ◽  
Organic Media ◽  
Plant Leaves ◽  
Specific Behavior ◽  
Extracellular Secretion ◽  
Trichoderma Fungi ◽  
Preliminary Study

Biosurfactants represent a structurally diverse group of secondary metabolites produced by bacteria, yeasts, and filamentous fungi. Their character is often associated with numerous additional properties. The observation of Trichoderma fungi of various species used as a source of bioinhibitors against pathogenic plants fungi focuses attention to the often quite specific behavior of preparations in contact with, among others, plant leaves, dependent on strain. Thus, an evaluation of the selected strains belonging to the species: T. atroviride, T. citrinoviride,T. reesei and T. harzianum was conducted towards their capability of the extracellular secretion of surfactants, with a simultaneous attempt to pre-determine their chemical nature. Two mineral-organic media were used for this purpose, and the culture fluid was extensively tested using a variety of methods. A decrease in surface tension was observed in culture fluid of each tested strain, especially T. citrinoviride HL and C1. The results strongly depended on medium composition, of which Saunders 1 and MGP 1 were most beneficial. The secreted compounds were further analyzed to pre-determine their chemical nature using IR, GC, and NMR. In the case of most efficient biosurfactant producers, a lipopeptide structure of the surfactants was concluded.

Sign in / Sign up

Export Citation Format

Share Document