Network-like arrangement of mixed-valence uranium oxide nanoparticles after glutathione-induced reduction of uranium(vi)

2018 ◽  
Vol 54 (63) ◽  
pp. 8697-8700 ◽  
Author(s):  
Jerome Kretzschmar ◽  
Toni Haubitz ◽  
René Hübner ◽  
Stephan Weiss ◽  
Richard Husar ◽  
...  
Keyword(s):  
Uranium Oxide ◽  
Mixed Valence ◽  
Building Blocks ◽  
Oxide Nanoparticles ◽  
Neutral Conditions

2–5 nm UO2+x nanocrystals yielded under near-neutral conditions arrange as 20–40 nm chain-like building blocks, and finally form network-like aggregates.

A cyano-bridged copper(ii)–copper(i) mixed-valence coordination polymer as a source of copper oxide nanoparticles with catalytic activity in C–N, C–O and C–S cross-coupling reactions

2014 ◽  
Vol 38 (9) ◽  
pp. 4267-4274 ◽  
Author(s):  
Manoj Trivedi ◽  
Sanjeev kumar Ujjain ◽  
Raj Kishore Sharma ◽  
Gurmeet Singh ◽  
Abhinav Kumar ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Coordination Polymer ◽  
Copper Oxide ◽  
Mixed Valence ◽  
Cross Coupling ◽  
Copper Oxide Nanoparticles ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
Coupling Reactions ◽  
Cross Coupling Reactions

A cyano-bridged Cu(ii)–Cu(i) complex was synthesized and transformed into CuO nanoparticles. Their catalytic activity in C–N, C–O, and C–S cross-coupling reactions was explored.

Synthesis and characterization of a uranium oxide hydrate framework with Sr(II) ions: Structural insights and mixed uranium valences

2022 ◽  
Author(s):  
Kim Lu ◽  
Yingjie Zhang ◽  
Tao Wei ◽  
Timothy Ablott ◽  
Thanh Ha Nguyen ◽  
...  
Keyword(s):  
Uranium Oxide ◽  
Mixed Valence ◽  
Synthesis And Characterization ◽  
Monoclinic Space Group ◽  
Spectroscopic Techniques ◽  
Space Group ◽  
Oxide Hydrate ◽  
Structural Insights

A mixed-valence uranium oxide hydrate framework with Sr2+ ions (UOF-Sr2) was synthesized hydrothermally and characterized with multiple structural and spectroscopic techniques. Compound UOF-Sr2 crystallizes in monoclinic space group C2/c, having...

Metal Oxide Nanocrystals: Building Blocks for Mesostructures and Precursors for Metal Nitrides

2007 ◽  
Vol 1007 ◽  
Author(s):  
Markus Niederberger ◽  
Jelena Buha ◽  
Igor Djerdj
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Sol Gel ◽  
Building Blocks ◽  
Formation Mechanisms ◽  
Oxide Nanoparticles ◽  
Metal Nitride ◽  
Ordered Mesoporous Materials ◽  
Crystallite Sizes ◽  
The One

ABSTRACTSol-gel routes to metal oxide nanoparticles in organic solvents under exclusion of water represent a valuable alternative to aqueous methods. In comparison to the complex aqueous chemistry, nonaqueous processes offer the possibility to better understand and to control the reaction pathways on a molecular level, enabling the synthesis of nanomaterials with high crystallinity and well-defined and uniform particle morphologies. The manifold role of the organic species in providing the oxygen for the oxide formation and in controlling the crystal growth and the assembly properties makes it possible to tailor the morphological, structural and compositional characteristics of the final inorganic products.In addition to metal oxides with nearly spherical crystallite sizes in the range of just a few nanometers, also more complex morphologies such as nanowire bundles, nanorods or lamellar organic-inorganic hybrids of varying hierarchical complexity can be achieved in one step and without the use of any surfactants. The spherical nanocrystallites are on the one hand versatile building blocks for the fabrication of fully crystalline and ordered mesoporous materials and on the other hand suitable precursors for the synthesis of metal nitride nanoparticles.This proceeding provides an overview of the various oxidic nanoparticles synthesized via the nonaqueous and surfactant-free sol-gel approach, summarizes the most frequently found formation mechanisms, and offers some insight into the crystallization pathway of nanoparticles. Furthermore, the use of metal oxide nanoparticles as nanobuilding blocks for the preparation of nano- and mesostructures as well as their transformation into metal nitride nanocrystals will be discussed.

[U(H2O)2]{[(UO2)10O10(OH)2][(UO4)(H2O)2]}: A Mixed-Valence Uranium Oxide Hydrate Framework

2020 ◽  
Vol 59 (17) ◽  
pp. 12166-12175 ◽  
Author(s):  
Yingjie Zhang ◽  
Tao Wei ◽  
Toan Trong Tran ◽  
Kimbal T. Lu ◽  
Zhaoming Zhang ◽  
...  
Keyword(s):  
Uranium Oxide ◽  
Mixed Valence ◽  
Oxide Hydrate

scholarly journals Synthesis and characterization of pH responsive D-glucosamine based molecular gelators

2014 ◽  
Vol 10 ◽  
pp. 3111-3121 ◽  
Author(s):  
Navneet Goyal ◽  
Hari P R Mangunuru ◽  
Bargav Parikh ◽  
Sonu Shrestha ◽  
Guijun Wang
Keyword(s):  
Molecular Weight ◽  
Building Blocks ◽  
Negative Influence ◽  
Low Molecular Weight ◽  
Ph Responsive ◽  
Triggered Release ◽  
Self Assembling ◽  
Potential Applications ◽  
Low Molecular Weight Gelators ◽  
Neutral Conditions

Small molecular gelators are a class of compounds with potential applications for soft biomaterials. Low molecular weight hydrogelators are especially useful for exploring biomedical applications. Previously, we found that 4,6-O-benzylidene acetal protected D-glucose and D-glucosamine are well-suited as building blocks for the construction of low molecular weight gelators. To better understand the scope of D-glucosamine derivatives as gelators, we synthesized and screened a novel class of N-acetylglucosamine derivatives with a p-methoxybenzylidene acetal protective group. This modification did not exert a negative influence on the gelation. On the contrary, it actually enhanced the gelation tendency for many derivatives. The introduction of the additional methoxy group on the phenyl ring led to low molecular weight gelators with a higher pH responsiveness. The resulting gels were stable at neutral pH values but degraded in an acidic environment. The release profiles of naproxen from the pH responsive gels were also analyzed under acidic and neutral conditions. Our findings are useful for the design of novel triggered release self-assembling systems and can provide an insight into the influence of the the structure on gelation.

3D hierarchically porous zinc–nickel–cobalt oxide nanosheets grown on Ni foam as binder-free electrodes for electrochemical energy storage

2015 ◽  
Vol 3 (47) ◽  
pp. 24022-24032 ◽  
Author(s):  
Huixin Chen ◽  
Qiaobao Zhang ◽  
Xiang Han ◽  
Junjie Cai ◽  
Meilin Liu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Transition Metal Oxides ◽  
Mixed Valence ◽  
Building Blocks ◽  
Energy Storage Devices ◽  
Hierarchically Porous ◽  
Storage Devices ◽  
Valence States ◽  
Nickel Cobalt Oxide ◽  
Binder Free

3D hierarchically porous transition metal oxides, particularly those involving different metal ions of mixed valence states and constructed from interconnected nano-building blocks directly grown on conductive current collectors, are promising electrode candidates for energy storage devices such as Li-ion batteries and supercapacitors.

Synthetic Glycopeptides for the Development of Antitumour Vaccines

2003 ◽  
Vol 56 (6) ◽  
pp. 519 ◽  
Author(s):  
Sebastian Dziadek ◽  
Carmen G. Espínola ◽  
Horst Kunz
Keyword(s):  
T Cell ◽  
Tandem Repeat ◽  
Solid Phase ◽  
Building Blocks ◽  
T Antigen ◽  
T Cell Response ◽  
Cytotoxic T Cell ◽  
Peptide Epitopes ◽  
Neutral Conditions ◽  
Sialyl Tn

Glycoproteins of tumour cells often are aberrantly glycosylated. In its tumour-associated form, the epithelial mucin MUC1 carries short saccharide structures such as TN, T, sialyl-TN, and sialyl-T antigens. Due to the incomplete saccharide components, peptide epitopes of the backbone become accessible to the immune system. For the construction of synthetic antitumour vaccines, glycopeptides have been synthesized which contain tumour-associated saccharide antigens and peptide sequences from the tandem repeat portion of MUC1. In the synthesis of these glycopeptides, preformed glycosyl–amino acid building blocks are applied in solution- or solid-phase strategies. Examples are given for the use of N-Fmoc-protected TN, T, sialyl-TN, and sialyl-T antigen–serine and –threonine conjugates in syntheses of glycopeptides from the tandem repeat region from MUC1 and the N-terminal portion of leukosialin (CD43). In solid-phase syntheses allylic linkers (cleavable under neutral conditions), acid-sensitive linkers, and the novel 2-phenyl-2-trimethylsilyl-ethyl ester linker (detachable with fluoride under neutral conditions) have successfully been applied. The synthetic tumour-associated glycopeptide antigens, identical to nature, often exhibit low immunogenicity. Therefore, their conjugation to carrier proteins is demanded. To this aim, glycopeptide antigens have been equipped with biotin labels or conjugated with T-cell peptide epitopes. Some of these synthetic glycopeptide antigens induce proliferation of T-cells and a cytotoxic T-cell response.

scholarly journals Gelation of uranyl ions and gel-derived uranium oxide nanoparticles for gas sensing

2020 ◽  
Vol 2 (6) ◽  
pp. 2478-2484
Author(s):  
Li Ding ◽  
Jennifer Leduc ◽  
Thomas Fischer ◽  
Sanjay Mathur ◽  
Yan Li
Keyword(s):  
Ethylene Glycol ◽  
Uranium Oxide ◽  
Gas Sensing ◽  
Oxide Nanoparticles ◽  
Uranyl Ions ◽  
Microwave Reaction

Gas sensing uranium oxide nanoparticles were synthesized by microwave reaction based on uranyl-ethylene-glycol gel.

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