Phase inversion (chemistry) Phase inversion (chemistry) Phase inversion is a chemical phenomenon exploited in the fabrication of artificial membranes. It is performed by removing the solvent from a liquid-polymer solution, leaving a porous, solid membrane. Phase inversion is a common method to form filtration membranes, which are typically formed using artificial polymers. The method of phase inversion is highly dependent on the type of polymer used and the solvent used to dissolve the polymer. Phase inversion can be carried out through one of four typical methods: The rate at which phase inversion occurs and the characteristics of the resulting membrane are dependent on
I'm Not a Girl, Not Yet a Woman basic sequence of E♭–A♭2–Fm7–B♭ as its chord progression. "I'm Not a Girl, Not Yet a Woman" received positive reviews from music critics. "Yale Daily News" writer Catherine Halaby called it a "well-executed ballad", while observing that "it comes across as a hybrid of advice to her young female fans on how to deal with puberty, and an explanation of her girly but not childlike attitude." Jim Farber of the "Daily News" while reviewing the Dream Within a Dream Tour, called the song "sugar pop dittie", along with Spears' previous ballad single "Don't Let Me Be the Last to Know". Nikki