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- W1544987984 abstract "Micelles are spherical, supramolecular, self-assembled, nano-sized, colloidal particles with a hydrophobic core and a hydrophilic shell formed by the aggregation of self-assembling amphiphilic molecules or surfactants in solutions. Amphiphilic macromolecules or surfactants, the structural unit of polymeric micelles have distinct hydrophobic (non-polar) and hydrophilic (polar, water-loving) block domains. Often, the hydrophilic part of the molecule is called the head and the hydrophobic part, usually a long alkyl substituent is called the tail. The simultaneous existence of chemical entities having an affinity and antipathy for water within the same molecule is the key phenomenon of amphipathicity [1–4]. The presence of a hydrophilic group makes the surfactants slightly soluble in water. Aqueous exposure induces the hydrophobic and hydrophilic segments to phase-separate and form nanoscopic, supramolecular core/shell structures, at a minimum particular polymeric concentration, termed micelles [5] The size and shape of micellar aggregates vary as spheres, rods, vesicles, tubules and lamellae, depending on the balance between the hydrophilicity and lipophilicity of a given amphiphilic molecule. Surfactants are classified on the basis of the charge carried by the polar head group as anionic, cationic, non-ionic, or amphoteric. Table 14.1 shows the typical structures of the few surfactants of these individual classes. The drastic changes in many physicochemical properties seen in an aqueous solution of amphiphilic molecules or surfactants with a hydrophobic domain take place when a specific concentration is exceeded because of the formation of oriented colloidal aggregates. The" @default.
- W1544987984 created "2016-06-24" @default.
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- W1544987984 creator A5084391530 @default.
- W1544987984 date "2013-01-21" @default.
- W1544987984 modified "2023-10-17" @default.
- W1544987984 title "Polymeric Micelles for the Delivery of Poorly Soluble Drugs" @default.
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