Crystallization induction time

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WebApr 29, 2024 · The time–temperature superposition of PEEK 450G; the frequency-scale shift factor (a T) and modulus-scale shift factor (b T); time–temperature protocol to monitor the isothermal crystallization induction time; an illustration to define crystallization induction time; the rheological induction times obtained at T c = 322. 325, and 328 °C ... WebJul 1, 1994 · Induction time for crystal growth, unlike the induction time for nucleation, becomes unbounded if defined rigorously. Recently, Deubener et. al. [1] have argued …

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WebA relation between induction time and metastable zone width in cooling crystallization has been developed based on the correlation between temperature and supersaturation with … WebInvestigation of the induction time for CaCO3 formation The induction time in the absence and presence of Cu2+ at flow rate of 20 mL/min can be seen in Figure 2. It shows that … diabetic doctors charleston wv

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WebThe induction time is defined as the time interval between to the formation of an appreciable amount of the solid phase and the initial moment of supersaturation of … WebAug 7, 2024 · Crystallization induction time was evaluated using a UV-2501 PC UV-VIS (Shimadzu, Kyoto, Japan) spectrophotometer connected to a CPS-240A thermoelectrically temperature controlled cell holder (Shimadzu). In particular, aliquots of 2 mL of molten oleogel (heating above melting point at least 10 min) were poured into disposable plastic … cindy neer

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Crystal Nucleation Rates from Probability Distributions of Induction ...

WebJan 25, 2024 · In other words, a PP ball reduced the induction time of form II nucleation from over 800 s to 562 ± 103 s. These results demonstrate that the presence of a plastic ball in aqueous acetaminophen solution undergoing ultrasonic irradiation effectively increases the probability and reduces the induction time of form II crystallization. WebThe Avrami equation cannot account for a period where no crystallization occurs; therefore, induction time, t 0, denotes the initial time at which crystallization begins. An induction period in the early stage of crystallization is required for creation of nuclei and is estimated by calculating the first derivative d X / d t , because it should ... diabetic doctors greenville scWebJun 14, 2024 · Precipitation generally refers to a relatively rapid formation of a sparingly soluble crystalline – or sometimes amorphous – solid phase from a liquid solution phase. Precipitation is rather poorly understood when compared with crystallization of more soluble materials. It generally involves the simultaneous and rapid occurrence of ... cindy nelson helena mt

"WebThe most important thermodynamic property is the solubility, and the key kinetic properties are the metastable zone width (MSZW) and the induction time. For antisolvent crystallization the solubility must be determined across a range of solvent compositions, as the solvent composition is the parameter which is changed to generate supersaturation. " - Crystallization induction time

Crystallization induction time

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WebJan 27, 2015 · The induction time distribution is explained by the stochastic nature of nucleation if the number of nuclei formed is approaching 1 per vial. Accurate … WebOne study was found which observed agitated solutions at similar supersaturations and temperatures, and it can be seen that for antisolvent crystallization, at a supersaturation …

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WebNov 24, 2024 · The observed induction time for seeded gypsum crystallization was investigated with respect to gypsum particle seed size and mass loading. The induction time was significantly shortened in the presence of gypsum seeds (27 µm - 85 µm) relative to unseeded solutions. The induction time correlated with the initial total seeds surface … WebAug 28, 2013 · An approximation of the crystallization rate can be made by the overall crystallization rate , where (half the crystallization time) is the time at which approaches the value of 50%. This parameter is proportional to both the primary nucleation rate and the crystal/spherulite growth [].The induction time , that is, the time at which starts to …

WebFeb 4, 2024 · Crystallization is a collection of the subprocesses of crystal primary nucleation, crystal growth, secondary nucleation and agglomeration, which are all governed by the prevailing supersaturation as well as other parameters. The rates of these … WebJan 3, 2024 · The temperature dependence of the crystallization induction time (τ 0 (T)) is a function of the thermodynamic activation barrier and the frequency of “attempted jumps” (1/τ α (T)) to overcome the barrier. Even …

WebAfter a temperature-dependent induction time, during stage 2 the Mg-ACC partially dehydrates and orders prior to its rapid (<5 min) crystallization to non-stoichiometric proto-dolomite. This occurs via the dissolution of Mg-ACC, followed by the secondary nucleation of proto-dolomite from solution. WebMay 3, 2013 · Smejkal et al. 6 found that the induction time for crystallization of lysozyme in a stirred crystallizer was substantially shorter compared to an experiment in a nonagitated microbatch.

WebJul 2, 2024 · Adding FHPKO to CBS increased the crystallization rate with a decrease in crystallization induction time but did not increase the heat resistance. In contrast, all KSF-CBS blends exhibited higher heat resistance than CBS and crystallized into β' form, a preferred polymorph for fats used in compound chocolate.

WebSep 17, 2024 · With the extension of crystallization time, the relative crystallinity of YSG and YSV molecular sieves increased rapidly in a short time. After a period of crystallization, the crystallization rate slowed down, and declined after reaching their respective peaks. ... Obtained data, including the nucleation induction period, apparent … diabetic doctors baldwin countyWebApr 3, 2024 · Its crystallization induction time (λ) was long (~123 min), this being followed by a rapid crystallization rate (μ ~ 1.7%/min) before reaching an SFC plateau of 21% (Table 4). The sigmoidal curves indicated that no TAG crystallized until a sufficient number of stable nuclei were formed, followed by a period of rapid crystallization initiated ... cindyneedham.comWebApr 14, 2024 · Induction time of crystallization depends on the cooling rate. Investigations found that EVA will grow by the hang-wall model at the air-liquid contact line interface, or by extrude-bubble growth at any site on the liquid surface in a beaker by supersaturation formation. Rapid EVA crystallization was interpreted as the introduction of space ... diabetic doctors in 80016WebNov 19, 2010 · In general, the crystallization process can last minutes and even hours depending on the supercooling conditions, which can be related to the induction time and crystal growth rate [5, [48] [49 ... cindy nelson irving texasWebIt can be measured experimentally to describe the time required for the formation of an observable change in the crystallization system from the starting point of supersaturation. Figure 5 shows the induction time measurement of AM in WSC solution. The concentration of AM in the water rapidly decreased for one minute due to the crystal nuclei ... cindy nealyWebMar 1, 2024 · The induction time during crystallization process is the time between a supersaturated solution reaching to the onset of nucleation [4]. Therefore, the … diabetic doctors in birminghamWebAug 30, 2024 · The induction time is inversely proportional to the crystallization rate: τ = 1/J (Schukin et al. 2016). Therefore, specific surface energy σ was calculated based on the dependence of the induction time on supersaturation. ... There are two pronounced portions in all experimental dependences of the optical density on the crystallization … cindy nesiba counseling