Synthesis and Characterization of Dendrimer Templated Supported
... from residual Cu(II)-dendrimer complexes.33 The Au-only sample has similar features with an additional shoulder from 500 to 600 nm. This shoulder is consistent with the plasmon band arising from Au NPs larger than 2 nm.43,44 The bimetallic Pt16Au16 spectrum is generally similar to the spectrum of Pt ...
... from residual Cu(II)-dendrimer complexes.33 The Au-only sample has similar features with an additional shoulder from 500 to 600 nm. This shoulder is consistent with the plasmon band arising from Au NPs larger than 2 nm.43,44 The bimetallic Pt16Au16 spectrum is generally similar to the spectrum of Pt ...
Chemical Dynamics at Surfaces
... wire. In reality it was more convenient to run the experiment backwards: H2 and O2 as educts. ...
... wire. In reality it was more convenient to run the experiment backwards: H2 and O2 as educts. ...
Fabrication of superhydrophobic surface of stearic acid grafted zinc
... [10]. One centers around methods that enlarge the roughness of materials’ surface [11-14], the other one involves lower materials’ surface free energy [7,15-20]. For a smooth surface, the CA increases only up to 120o around, therefore building a suitable micro-structure is the key for preparation a ...
... [10]. One centers around methods that enlarge the roughness of materials’ surface [11-14], the other one involves lower materials’ surface free energy [7,15-20]. For a smooth surface, the CA increases only up to 120o around, therefore building a suitable micro-structure is the key for preparation a ...
Amine‐Directed Hydrogen‐Bonded Two‐Dimensional
... hand, 1,3,5-benzenetricarboxylic acid (Figure 4 b, inset) is capable of forming a continuous 2D long-range ordered structure on Au(111) (Figure 4 b) with hexamer building blocks and via intermolecular hydrogen bonds between neighboring molecules.[30] Hydrogen bonding mediated by carboxylic acids in ...
... hand, 1,3,5-benzenetricarboxylic acid (Figure 4 b, inset) is capable of forming a continuous 2D long-range ordered structure on Au(111) (Figure 4 b) with hexamer building blocks and via intermolecular hydrogen bonds between neighboring molecules.[30] Hydrogen bonding mediated by carboxylic acids in ...
Investigating the kinetic mechanisms of the oxygen
... suitable choice of catalysts and electrolytic solution. This can only be achieved if the kinetics and mechanism of this reaction are known in detail. In this study, we determined the rate constants for each elementary step of ORR for a platinum electrode in 0.1 mol·L−1 LiClO4/1,2-dimethoxyethane (DM ...
... suitable choice of catalysts and electrolytic solution. This can only be achieved if the kinetics and mechanism of this reaction are known in detail. In this study, we determined the rate constants for each elementary step of ORR for a platinum electrode in 0.1 mol·L−1 LiClO4/1,2-dimethoxyethane (DM ...
coordination compounds - Ahlcon Public School , Mayur Vihar Ph
... evolved. The gas intensified when Cu turnings were also added into this test tube. On cooling the gas A changed into a colourless gas (B). i) ii) ...
... evolved. The gas intensified when Cu turnings were also added into this test tube. On cooling the gas A changed into a colourless gas (B). i) ii) ...
Final published version
... [0001] than along other directions.18 Therefore, in the growth process of ZNWs, ZnO nanoparticles in a seed layer only grow upward because all other directions are blocked by the neighboring nanoparticles. However, ZnO nanoparticles in a solution grow in every possible direction like a star because ...
... [0001] than along other directions.18 Therefore, in the growth process of ZNWs, ZnO nanoparticles in a seed layer only grow upward because all other directions are blocked by the neighboring nanoparticles. However, ZnO nanoparticles in a solution grow in every possible direction like a star because ...
- UCL Discovery
... α-Fe2O3 under vacuum conditions. α-Fe2O3 is correctly described as a chargetransfer insulator, in agreement with the spectroscopic evidence when the optimized value for U = 5 eV is employed. The benzene molecule is shown to interact relatively more strongly with the (01 1 2) surface via cation-π int ...
... α-Fe2O3 under vacuum conditions. α-Fe2O3 is correctly described as a chargetransfer insulator, in agreement with the spectroscopic evidence when the optimized value for U = 5 eV is employed. The benzene molecule is shown to interact relatively more strongly with the (01 1 2) surface via cation-π int ...
The prebiotic molecules observed in the interstellar gas
... intensity of the molecular radio emission lines in space depends mainly on two factors, both of which can be well determined: the molecular electric dipole moment and the rotational partition function, which depends on the populations of the various levels. For stable molecules, the dipole moment ca ...
... intensity of the molecular radio emission lines in space depends mainly on two factors, both of which can be well determined: the molecular electric dipole moment and the rotational partition function, which depends on the populations of the various levels. For stable molecules, the dipole moment ca ...
Catalysis
... 4. Enzyme catalysed reactions are much more sensitive to catalytic poisons such as HCN, H2S, CS2 etc. The inhibitors interact with the active functional groups present on the enzyme surface and often reduce or completely destroy the catalytic activity of the enzymes 5. The activity of certain enzym ...
... 4. Enzyme catalysed reactions are much more sensitive to catalytic poisons such as HCN, H2S, CS2 etc. The inhibitors interact with the active functional groups present on the enzyme surface and often reduce or completely destroy the catalytic activity of the enzymes 5. The activity of certain enzym ...
Bulk and Surface Micromachining
... However, KOH is not used in micromachining because its potassium ion content bans it from clean room operations. Also, it is highly corrosive and attacks aluminum, which makes it undesirable for CMOS fabrication. XeF2 is a useful dry etchant for silicon in bulk CMOS fabrication because it is highly ...
... However, KOH is not used in micromachining because its potassium ion content bans it from clean room operations. Also, it is highly corrosive and attacks aluminum, which makes it undesirable for CMOS fabrication. XeF2 is a useful dry etchant for silicon in bulk CMOS fabrication because it is highly ...
Development of a Photocatalytic Wet Scrubbing - soil
... Integrated Control, Guangdong Institute of Eco-EnVironment and Soil Science, Guangzhou 510650, P.R. China ...
... Integrated Control, Guangdong Institute of Eco-EnVironment and Soil Science, Guangzhou 510650, P.R. China ...
Module 2
... these particles. The disorder in a system depends only on the conditions that determine the state of the system, such as composition, temperature, and pressure. The change in entropy therefore depends only on the initial and final states of the system. Entropy, like enthalpy is a state function. Def ...
... these particles. The disorder in a system depends only on the conditions that determine the state of the system, such as composition, temperature, and pressure. The change in entropy therefore depends only on the initial and final states of the system. Entropy, like enthalpy is a state function. Def ...
Adsorption
Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) permeates or is dissolved by a liquid or solid (the absorbent). Adsorption is a surface-based process while absorption involves the whole volume of the material. The term sorption encompasses both processes, while desorption is the reverse of it. Adsorption is a surface phenomenon.Similar to surface tension, adsorption is a consequence of surface energy. In a bulk material, all the bonding requirements (be they ionic, covalent, or metallic) of the constituent atoms of the material are filled by other atoms in the material. However, atoms on the surface of the adsorbent are not wholly surrounded by other adsorbent atoms and therefore can attract adsorbates. The exact nature of the bonding depends on the details of the species involved, but the adsorption process is generally classified as physisorption (characteristic of weak van der Waals forces) or chemisorption (characteristic of covalent bonding). It may also occur due to electrostatic attraction.Adsorption is present in many natural, physical, biological, and chemical systems, and is widely used in industrial applications such as activated charcoal, capturing and using waste heat to provide cold water for air conditioning and other process requirements (adsorption chillers), synthetic resins, increase storage capacity of carbide-derived carbons, and water purification. Adsorption, ion exchange, and chromatography are sorption processes in which certain adsorbates are selectively transferred from the fluid phase to the surface of insoluble, rigid particles suspended in a vessel or packed in a column. Pharmaceutical industry applications, which use adsorption as a means to prolong neurological exposure to specific drugs or parts thereof, are lesser known.However, it should be remarked that the distinction between adsorption and absorption vanishes as we go from perfectly crystalline macroscopic materials to porous/structured materials, aggregates and composites made out of increasingly smaller grains, viz., micron-sized particles to nanoparticles, sub-nano particles and finally molecules (or atoms). In such nano-composites, the internal surface area of particulate matter is very large. Then the adsorption on internal surfaces simply becomes absorption when viewed from the bulk. Then the distinction between adsorption and absorption vanishes. On the other hand, the distinction is clearest between bulk solids without internal structure, but having only surfaces where only adsorption can occur on the outer surfaces, and nanocomposites or aggregates with internal structure where absorption by the host material is simply adsorption on internal surfaces of the host material. As an example, we may consider a crystalline piece of silicon dioxide (quartz) which can adsorb water molecules on its surface. However, if the quartz is ground into very fine sand, the pile of sand (an aggregate) has a very large internal surface area. A very large amount of water can be adsorbed by the ""internal"" surfaces of the grains in the pile of sand, and this absorption is simply ""internal adsorption. If water is made to flow thorugh such a pile of sand, ions and toxins in the water may be preferentially adsorbed by the surfaces of the grains of sand, providing a simple, well-known water purification application.The word ""adsorption"" was coined in 1881 by German physicist Heinrich Kayser (1853-1940).