Academic literature on the topic 'MOF poreux flexible'

Among the third generation photovoltaic devices, organic-inorganic hybrid perovskite solar cells (PSCs) are the most significant scaffold due to its skyrocketing increase in the photo conversion efficiency from 3.8% to 25.7% within a decade. The metal organic frameworks (MOFs) scaffolds are porous materials in which metal ions connected with organic ligands through coordination bond thereby creating a three-dimensional network structure. The prominent characteristics of metal-organic frameworks (MOFs) are high porosity, tunable pore size, ultra high surface area, crystalline with rigid and flexible frameworks. It is observed that incorporation of metal-organic frameworks (MOFs) in the different layers of perovskite solar cells improved the device efficiency and improved stability

Metal-Organic Frameworks (MOFs) are a class of porous crystalline materials made-up of transition-metal cations linked with multidentate organic ligands by the coordination bonds. The strong, flexible frameworks and the porous structure of the MOFs establish them as an effective carriers of various functional compounds, such as gases, drugs, and anti-microbial agents. The MOFs render high loading capacity and sustained release, which is the desired property in anti-microbial applications. Similar porous material for the anti-microbial application is Zeolite, however, it is more complex to synthesize than MOFs. Currently, MOFs are used mainly in catalysis, gas separation and storage, and water purification applications. In the applications as anti.microbial agents, MOFs are just emerging into the field application from the laboratory scale. Hence, this chapter discusses the properties, synthetic procedures, anti-bacterial mechanisms and various forms of MOFs for anti-microbial applications. The MOFs are often doped with metal nanoparticles, polymers, and metal-polymer complexes. Each category of MOFs has a different mechanistic approach to inhibiting microbial colony growth. In this regard, this chapter will provide sufficient information on the MOFs, which will help to understand their significance in anti-microbial applications and their scope.

Containment with soil-bentonite (SB) cut-off walls is a valid method to prevent the contaminants in subsurface environment from migrating in the aquifer. This paper addresses the laboratory testing results on the hydraulic barrier performance of SB focusing on its chemical compatibility, since the swelling of bentonite, to which the low hydraulic conductivity (k) of the SB is attributed, is significantly influenced by the chemical species and their concentrations in the soil and groundwater. Flexible-wall hydraulic conductivity tests were conducted for SB specimens, which were processed from three different types of soils, exposed to various types and concentrations of chemicals (calcium chloride, heavy fuel oil, ethanol, and/or seawater) in the permeant and/or in the pore water of original soil. For the SB specimens in which the pore water of original soil did not contain such chemicals and thus the sufficient bentonite hydration was expected to occur, k values were not significantly increased even when permeated with the relatively aggressive chemical solutions such as 1.0 mol/L CaCl2or 50%-concentration ethanol solution. In contrast, the SB specimens containing CaCl2in the pore water had the relatively higher k values. For the CaCl2concentrations higher than 0.05 mol/L or the seawater, approximately one order of magnitude higher k values were obtained. The excellent linear correlation between log k and swelling pressure of the SB specimens containing various types and concentrations of chemicals implies that the swelling pressure can be a good indicator for the hydraulic barrier performance of the SB.