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Aqueous suspensions of poly-N-isopropylacrylamide microgel particles are a type of colloid consisting of crosslinked polymer chains that form a three-dimensional network structure. These particles can swell or shrink in response to changes in temperature, pH, or ionic strength, which makes them useful in various applications such as drug delivery, tissue engineering, and smart coatings. The suspensions can be characterized by their particle size distribution, zeta potential, and rheological properties, which determine their stability and behavior under different conditions.