Pairs of ionic group dependence of the structure of a complex coacervate core micelle (C3M) in an aqueous solution was investigated using DLS, cryo-TEM, and SANS with a contrast matching technique and a detailed model analysis. Block copolyelectrolytes were prepared by introducing an ionic group (i.e., ammonium, guanidinium, carboxylate, and sulfonate) to poly(ethylene oxide-b-allyl glycidyl ether) (NPEO = 227 and NPAGE = 52), and C3Ms were formed by simple mixing of two oppositely-charged block copolyelectrolyte solutions with the exactly same degree of polymerization. All four C3Ms are spherical with narrow distribution of micelle dimension, and the cores are significantly swollen by water, resulting in relatively low brush density of PEO chains on the core surface. With the pair of strong polyelectrolytes, core radius and aggregation number increases, which reflects that the formation of complex coacervates are significantly sensitive to the pairs of ionic groups rather than simple charge pairing.

The core aims of Authorised Economic Operator (AEO) are to establish an international corporate identity system and encourage supply chain enterprises to maintain high degrees of safety and security in their international trading. This paper conducts an in-depth study of customs management thinking regarding the AEO system and actively explores its implementation and integration with international customs standards common practice and fulfilling the requirements of any international obligations. The government will need to work with enterprises in developing basic conditions on AEO certification, recognising and dealing with problems as they arise, while seeking to maintain the facilitation of customs clearance for excising lawabiding and sustainable trade routes and ensuring the security.