Effect of Short-Chain Alkylamine on Micelle Structure in MCM-41 Synthesis Process

抄録

It was found that MCM-41 mesostructure can be strengthened by using ethylamine as a mineralizer in our previous study. The addition of ethylamine causes structural changes at the same time. In this report, important factors deciding micelle formation and possible changes in conformation of micelle when small amphiphilic materials co-exist are discussed. Incorporation of short-chain alkylamine in micelle is predicted by the energetical consideration if alkylamine is in neutral state and has an adequately hydrophobic chain part. Ethylamine which is supposed to be neutral in the pH range above pK_a is found to incorporate in micelle when alcohol coexists together and increases hydrophobicity of ethylamine by forming complex with it. The same phenomenon takes place even without the addition of alcohol when alkylamine having a longer alkylchain such as propylamine and butylamine is used because of increased hydrophobicity.