scholarly journals Hydrogels as Porogens for Nanoporous Inorganic Materials

Gels ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 83 ◽  
Author(s):  
Christian Weinberger ◽  
Dirk Kuckling ◽  
Michael Tiemann
Keyword(s):  
Metal Oxides ◽  
Porous Materials ◽  
Nucleation And Growth ◽  
Inorganic Materials ◽  
Organic Component ◽  
Organic Polymer ◽  
Metal Chalcogenides ◽  
Soft Or ◽  
Polymer Hydrogels ◽  
Synthesis Of Materials

Organic polymer-hydrogels are known to be capable of directing the nucleation and growth of inorganic materials, such as silica, metal oxides, apatite or metal chalcogenides. This approach can be exploited in the synthesis of materials that exhibit defined nanoporosity. When the organic polymer-based hydrogel is incorporated in the inorganic product, a composite is formed from which the organic component may be selectively removed, yielding nanopores in the inorganic product. Such porogenic impact resembles the concept of using soft or hard templates for porous materials. This micro-review provides a survey of select examples from the literature.

Review on the effect of metal oxides as surface coatings on hydrogen storage properties of porous and non-porous materials

2021 ◽  
Author(s):  
Thabang Ronny Somo ◽  
Tumiso Eminence Mabokela ◽  
Daniel Malesela Teffu ◽  
Tshepo Kgokane Sekgobela ◽  
Mpitloane Joseph Hato ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Metal Oxides ◽  
Porous Materials ◽  
Surface Coatings ◽  
Hydrogen Storage Properties ◽  
Storage Properties

Soft Chemical Routes to Heterostructured High-Tc Superconducting Materials

MRS Bulletin ◽  
2000 ◽  
Vol 25 (9) ◽  
pp. 32-39 ◽  
Author(s):  
Jin-Ho Choy ◽  
Soon-Jae Kwon ◽  
Seong-Ju Hwang ◽  
Eue-Soon Jang
Keyword(s):  
Solid State ◽  
High Performance ◽  
Inorganic Compounds ◽  
Rechargeable Batteries ◽  
Host Lattice ◽  
Inorganic Materials ◽  
Solid State Reactions ◽  
Metal Chalcogenides ◽  
Structural Anisotropy ◽  
Intercalation Reaction

Recently, inorganic/inorganic and organic/inorganic heterostructured materials have attracted considerable research interest, due to their unusual physicochemical properties, which cannot be achieved by conventional solid-state reactions. In order to develop new hybrid materials, various synthetic approaches, such as vacuum deposition, Langmuir–Blodgett films, selfassembly, and intercalation techniques, have been explored. Among them, the intercalation reaction technique—that is, the reversible insertion of guest species into the two-dimensional host lattice—is expected to be one of the most effective tools for preparing new layered heterostructures because this process can provide a soft chemical way of hybridizing inorganic/inorganic, organic/inorganic, or biological/inorganic compounds. In fact, the intercalation/deintercalation process allows us to design high-performance materials in a solution at ambient temperature and pressure, just as “soft solution processing” provides a simple and economical route for advanced inorganic materials by means of an environmentally benign, lowenergy method. These unique advantages of the intercalation technique have led to its wide application to diverse fields of the solid-state sciences, namely, secondary (rechargeable) batteries, electrochromic systems, oxidation–reduction catalysts, separating agents, sorbents, and so on. Through these extensive studies, many kinds of low-dimensional compounds have been developed as host materials for the intercalation reaction, including graphite, transition-metal chalcogenides, transitionmetal oxides, aluminosilicates, metal phosphates, metal chalcogenohalides, and so on. Recently, the area of intercalation chemistry has been extended to high-Tc superconducting copper oxides, resulting in remarkable structural anisotropy.

scholarly journals Modeling the Ternary Chalcogenide Na2MoSe4 from First-Principles

2020 ◽  
Author(s):  
Etienne Palos ◽  
Armando Reyes-Serrato ◽  
Gabriel Alonso-Nuñez ◽  
J. Guerrero Sánchez
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Inorganic Compounds ◽  
Chemical Properties ◽  
Relativistic Effects ◽  
Equilibrium Structure ◽  
Inorganic Materials ◽  
Metal Chalcogenides ◽  
Energy Storage Devices ◽  
Transition Metal Chalcogenides

In the ongoing pursuit of inorganic compounds suitable for solid-state devices, transition metal chalcogenides have received heightened attention due to their physical and chemical properties. Recently, alkali-ion transition metal chalcogenides have been explored as promising candidates to be applied in optoelectronics, photovoltaics and energy storage devices. In this work, we present a comprehensive theoretical study of sodium molybdenum selenide (Na<sub>2</sub>MoSe<sub>4</sub>). First-principles computations were performed on a set of hypothetical crystal structures to determine the ground state and electronic properties of Na<sub>2</sub>MoSe<sub>4</sub>. We find that the equilibrium structure of Na<sub>2</sub>MoSe<sub>4</sub> is a simple orthorhombic (<i>oP</i>) lattice, with space group Pnma, as evidenced by thermodynamics. Electronic structure computations reveal that three phases are semiconducting, while one (<i>cF</i>) is metallic. Relativistic effects and Coulomb interaction of localized electrons were assessed for the <i>oP</i> phase, and found to have a negligible influence on the band strucutre. Finally, meta-GGA computations were performed to model the band structure of primitive orthorhombic Na<sub>2</sub>MoSe<sub>4</sub> at a predictive level. We employ the Tran-Blaha modified Becke-Johnson potential to demonstrate that <i>oP</i> Na2MoSe4 is a semiconductor with a direct bandgap of 0.53 eV at the <b>Γ</b> point. Our results provide a foundation for future studies concerned with the modeling of inorganic and hybrid organic-inorganic materials chemically analogous to Na<sub>2</sub>MoSe<sub>4</sub>.<br>

scholarly journals Microbial reduction of metal-organic frameworks enables synergistic chromium removal

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Sarah K. Springthorpe ◽  
Christopher M. Dundas ◽  
Benjamin K. Keitz
Keyword(s):  
Metal Oxides ◽  
Metal Organic Frameworks ◽  
Shewanella Oneidensis ◽  
Microbial Reduction ◽  
Pollutant Removal ◽  
Inorganic Materials ◽  
Surface Areas ◽  
Synthetic Materials ◽  
Metal Organic ◽  
Multiple Cycles

AbstractRedox interactions between electroactive bacteria and inorganic materials underpin many emerging technologies, but commonly used materials (e.g., metal oxides) suffer from limited tunability and can be challenging to characterize. In contrast, metal-organic frameworks exhibit well-defined structures, large surface areas, and extensive chemical tunability, but their utility as microbial substrates has not been examined. Here, we report that metal-organic frameworks can support the growth of the metal-respiring bacterium Shewanella oneidensis, specifically through the reduction of Fe(III). In a practical application, we show that cultures containing S. oneidensis and reduced metal-organic frameworks can remediate lethal concentrations of Cr(VI) over multiple cycles, and that pollutant removal exceeds the performance of either component in isolation or bio-reduced iron oxides. Our results demonstrate that frameworks can serve as growth substrates and suggest that they may offer an alternative to metal oxides in applications seeking to combine the advantages of bacterial metabolism and synthetic materials.

scholarly journals Towards Low Cost and Low Temperature Capacitive CO2 Sensors Based on Amine Functionalized Silica Nanoparticles

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1097 ◽  
Author(s):  
Jamila Boudaden ◽  
Armin Klumpp ◽  
Hanns-Erik Endres ◽  
Ignaz Eisele
Keyword(s):  
Silica Nanoparticles ◽  
Low Cost ◽  
Inorganic Materials ◽  
Organic Polymer ◽  
Impregnation Method ◽  
Inorganic Particles ◽  
Co2 Sensor ◽  
Sensing Material ◽  
Carbon Dioxide Co2 ◽  
Thermal Stability Of

Hybrid materials based on inorganic particles and an organic polymer were developed and used as an efficient sensing material for carbon dioxide (CO2). The sensing material consists of fumed silica that is functionalized with an organic polymer, polyethylenimine, by means of the impregnation method. The organic polymer is effectively immobilized around the silica nanoparticles and confirmed by infrared spectroscopy. Thermogravimetric analysis proves the thermal stability of the sensing material. CO2 capacitive sensors operating at temperatures lower than 70 °C were fabricated by depositing a thin layer of hybrid sensing material on interdigitated gold electrodes. Impedance spectroscopy explored the sensing capability of the hybrid organic–inorganic material towards CO2 in the presence of different relative humidity levels, as well as its stability and reversibility. This strategy to couple organic and inorganic materials as a sensing layer for CO2 paves the way for the design of a low-cost CO2 sensor.

ChemInform Abstract: Solution-Phase Conversion of Bulk Metal Oxides to Metal Chalcogenides Using a Simple Thiol-Amine Solvent Mixture.

ChemInform ◽  
2015 ◽  
Vol 46 (39) ◽  
pp. no-no
Author(s):  
Carrie L. McCarthy ◽  
David H. Webber ◽  
Emily C. Schueller ◽  
Richard L. Brutchey
Keyword(s):  
Metal Oxides ◽  
Solvent Mixture ◽  
Solution Phase ◽  
Metal Chalcogenides ◽  
Phase Conversion ◽  
Bulk Metal

Polypyrrole coating of inorganic and organic materials by chemical oxidative polymerisation

2012 ◽  
Vol 66 (5) ◽  
Author(s):  
Mária Omastová ◽  
Matej Mičušík
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Conducting Polymers ◽  
Metal Oxides ◽  
Clay Minerals ◽  
Radiation Shielding ◽  
Inorganic Materials ◽  
High Electrical Conductivity ◽  
New Materials ◽  
Nanoparticles Of Metal Oxides

AbstractPolypyrrole is one of the most frequently studied conducting polymers, having high electrical conductivity and stability, suitable for multi-functionalised applications. Coatings of chemically synthesised polypyrrole applied onto various organic and inorganic materials, such as polymer particles and films, nanoparticles of metal oxides, clay minerals, and carbon nanotubes are reviewed in this paper. Its primary subject is the formation of new materials and their application in which chemical oxidative polymerisation of pyrrole was used. These combined materials are used in antistatic applications, such as anti-corrosion coating, radiation-shielding, but also as new categories of sensors, batteries, and components for organic electronics are created by coating substrates with conducting polymer layers or imprinting technologies.

Solution-Phase Conversion of Bulk Metal Oxides to Metal Chalcogenides Using a Simple Thiol-Amine Solvent Mixture

2015 ◽  
Vol 127 (29) ◽  
pp. 8498-8501 ◽  
Author(s):  
Carrie L. McCarthy ◽  
David H. Webber ◽  
Emily C. Schueller ◽  
Richard L. Brutchey
Keyword(s):  
Metal Oxides ◽  
Solvent Mixture ◽  
Solution Phase ◽  
Metal Chalcogenides ◽  
Phase Conversion ◽  
Bulk Metal
Sign in / Sign up

Export Citation Format

Share Document