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Polymer-Based Colloidal Aggregates as a New Class of Drug Delivery Systems
Published in Severian Dumitriu, Valentin Popa, Polymeric Biomaterials, 2020
While polymeric micelles characterized by a hydrophilic shell have been extensively studied, fewer studies have been reported on micelles in organic solvents (reverse micelles), where the role of the core and the shell is exchanged (a polar hydrophilic core and a hydrophobic shell). In the last decade, reverse micelles have been prepared from dendrimers [23] or hyperbranched polymers [24]. The amphiphilic polymers were obtained from the hydrophobic modification of poly(glycerol) of poly(amidoamine), and the hydrophobic shell-forming segments consisted of covalently linked hydrocarbon chains resulting in micelles soluble in organic solvents. To these structures, a potential as drug delivery systems has been attributed and, because of these properties, they are mentioned here.
Nanotechnology in wastewater treatment: a review
Published in Badal Jageshwar Prasad Dewangan, Maheshkumar Narsingrao Yenkie, Novel Applications in Polymers and Waste Management, 2018
Bais madhuri, S. P. Singh, R. D. Batra
Invention of dendritic polymers are providing opportunities to develop effective UF processes for purification of water contaminated by toxic metal ions, organic and inorganic solutes, and bacteria and viruses. Poly(amidoamine), or PAMAM, is a class of dendrimer which is made of repetitively branched subunits of amide and amine functionality. PAMAM belongs to the class of water-soluble polymers which is a criteria much needed for the agent in the treatment of water. They can act as floculants for dye industry wastewater treatment. Diallo et al. (2005) tested the feasibility of PAMAM dendrimers with ethylene diamine core and terminal NH2 groups to recover Cu(II) ions from aqueous solutions. On a mass basis, the Cu(II) binding capacities of the PAMAM dendrimers are much larger and more sensitive to solution pH than those of linear polymers with amine groups.1
Synthesis and Biodisposition of Dendrimer Composite Nanoparticles
Published in Vladimir Torchilin, Mansoor M Amiji, Handbook of Materials for Nanomedicine, 2011
Lajos P. Balogh, Donald E. Mager, Mohamed K. Khan
The high level of synthetic control makes possible the synthesis of a narrow molecular weight range of well-defined and highly symmetrical dendrimer molecules containing a large number of regularly spaced internal and external functional groups. These groups may be used in chemical reactions to introduce required substituents on the dendrimer termini by design. Both the interior and the exterior can be either hydrophilic (cationic, anionic, or neutral) or hydrophobic, depending on how they are designed and synthesized. Because dendrimers are spherical, in solution they behave as low viscosity Newtonian fluids. In the absence of solvents, dendritic polymers usually collapse. In the presence of various solvents they expand to a size determined by their family and generation.4 Poly(amidoamine) (PAMAM) dendrimers contain beta-alanine subunits.82 PAMAM dendrimers undergo many changes in size, shape and flexibility as a function of increasing generations.83 They are small branching molecules at generation zero but evolve to a hard sphere behavior at generation seven.14,22,60 These dendrimers are well characterized and commercially available.
Demulsification of crude oil emulsion by capacitative sensor system measurement: introduction to apparatus and methodology
Published in Journal of Dispersion Science and Technology, 2019
Vaibhav Kedar, Sunil S. Bhagwat
There are wide ranges of surfactants that can be used as a demulsifying agents. The addition of certain cationic or amphoteric surfactants at ambient temperature was effective in separating emulsions typical of one SP process into oil and water phases, which met required crude oil pipeline and produced water- handling/disposal specifications.[6] Cationic surfactants are mainly quaternary ammonium salts of long chain tertiary amines. The presence of an amidoamine functional group in a surfactant helps in increasing its biodegradability and in minimizing its aquatic toxicity. Intermediates produced in the degradation process of amidoamine were also found to be biodegradable and less toxic.[7]