Squaring the Interface: "Surface-Assisted" Coordination Chemistry
... the carboxylate groups. At higher Fe concentrations the formation of the dimeric Fe2-based structures predominates. In general, it was found that the amount of iron used must slightly exceed the theoretical value of the structural motif formed. This effect, which is even more pronounced at higher an ...
... the carboxylate groups. At higher Fe concentrations the formation of the dimeric Fe2-based structures predominates. In general, it was found that the amount of iron used must slightly exceed the theoretical value of the structural motif formed. This effect, which is even more pronounced at higher an ...
Synthesis and characterization of highly ordered functional
... group in sequence from left to right. These results demonstrated that the Si–C bonds are stable during the film preparation process and that the amino-functional mesoporous materials were successfully prepared. Nitrogen adsorption/desorption isotherms of sample b (Fig. 3) were measured by a surface ...
... group in sequence from left to right. These results demonstrated that the Si–C bonds are stable during the film preparation process and that the amino-functional mesoporous materials were successfully prepared. Nitrogen adsorption/desorption isotherms of sample b (Fig. 3) were measured by a surface ...
Contact Angle Goniometry as a Tool for Surface Tension
... Our data are presented in Figure 3, which represents data sets for four surfaces. For example, Figure 3A represents Young’s contact angle measurements on glass slides. Four liquids were used to obtain four values of γc: acetonitrile, propanol, dioxane, and acetic acid. The choice of probing liquids ...
... Our data are presented in Figure 3, which represents data sets for four surfaces. For example, Figure 3A represents Young’s contact angle measurements on glass slides. Four liquids were used to obtain four values of γc: acetonitrile, propanol, dioxane, and acetic acid. The choice of probing liquids ...
Theoretical models of the interaction between organic molecules
... contribution is a small term in the total energy, it might be relevant in processes involving relatively small energy changes, i.e. surface reconstruction or Fermi surface modification. For this reason, the use of HF methods in adsorption studies is not recommended. More recently, the Density Functi ...
... contribution is a small term in the total energy, it might be relevant in processes involving relatively small energy changes, i.e. surface reconstruction or Fermi surface modification. For this reason, the use of HF methods in adsorption studies is not recommended. More recently, the Density Functi ...
Exam Review_Key_All Topics.082
... There are 0.009 mol Cl– ions in 15.0 mL of the solution. 6. An aqueous solution of calcium chloride contains 2.00 g of calcium chloride (molar mass 110.98 g mol-1) in 100.0 mL. Calculate the concentration of chloride ion (Cl–) in the solution. [Cl–] = 0.360 mol L-1 7. What volume of 0.200 mol L-1 Na ...
... There are 0.009 mol Cl– ions in 15.0 mL of the solution. 6. An aqueous solution of calcium chloride contains 2.00 g of calcium chloride (molar mass 110.98 g mol-1) in 100.0 mL. Calculate the concentration of chloride ion (Cl–) in the solution. [Cl–] = 0.360 mol L-1 7. What volume of 0.200 mol L-1 Na ...
Single and Competitive Protein Sorption at Soft Polymeric Interfaces
... or even toxic side effects. It is a well-known fact, that implanted and blood-contacted biomaterials can induce adverse side effects like inflammation, 5,6 thrombosis 7 and infections. 8 These effects can be traced back to a quickly forming protein layer on the biomaterial. Furthermore, it is known tha ...
... or even toxic side effects. It is a well-known fact, that implanted and blood-contacted biomaterials can induce adverse side effects like inflammation, 5,6 thrombosis 7 and infections. 8 These effects can be traced back to a quickly forming protein layer on the biomaterial. Furthermore, it is known tha ...
Mechanisms and energetics of surface reactions at the copper
... polished/reduced copper surface, since a significant amount of molecular oxygen/air will be buried with the copper canisters, and since the oxidation of metallic copper by molecular oxygen is both rapid and spontaneous (reactions 1 and 2) (CRC 2003). In Figure 1-1, a significant part of the adsorbed ...
... polished/reduced copper surface, since a significant amount of molecular oxygen/air will be buried with the copper canisters, and since the oxidation of metallic copper by molecular oxygen is both rapid and spontaneous (reactions 1 and 2) (CRC 2003). In Figure 1-1, a significant part of the adsorbed ...
Gas Volumes and the Ideal Gas Law
... Recall an important point of Dalton’s atomic theory: atoms are indivisible. Dalton also thought that the particles of gaseous elements exist in the form of isolated single atoms. He believed that one atom of one element always combines with one atom of another element to form a single particle of th ...
... Recall an important point of Dalton’s atomic theory: atoms are indivisible. Dalton also thought that the particles of gaseous elements exist in the form of isolated single atoms. He believed that one atom of one element always combines with one atom of another element to form a single particle of th ...
Surface chemistry of carbon dioxide - Max-Planck
... ~-orbital energies increase slightly or are unchanged from the linear to the bent configuration. In contrast, the n-orbital energies show pronounced alterations. In the bent molecule the degeneracies of all the n-orbitals are split. This is clear from Fig. 1, if we remember the two equivalent compon ...
... ~-orbital energies increase slightly or are unchanged from the linear to the bent configuration. In contrast, the n-orbital energies show pronounced alterations. In the bent molecule the degeneracies of all the n-orbitals are split. This is clear from Fig. 1, if we remember the two equivalent compon ...
V α - Springer
... An important definition: the thermodynamic system The objects described by thermodynamics are called thermodynamic systems. These are not simply “the part of the physical universe that is under consideration” (or in which we have special interest), rather material bodies having a special property; t ...
... An important definition: the thermodynamic system The objects described by thermodynamics are called thermodynamic systems. These are not simply “the part of the physical universe that is under consideration” (or in which we have special interest), rather material bodies having a special property; t ...
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).