2 edition of Mechanism by which surfactants modify adipic acid crystal growth rate and habit. found in the catalog.
Mechanism by which surfactants modify adipic acid crystal growth rate and habit.
Frederick W. Tausch
D.Sc. thesis, Massachusetts Institute of Technology, 1961.
|The Physical Object|
46 Physical Pharmacy 47 ( J mol –1 K), T is temperature in kelvins, c is the concentration in mol m–3 and x has a value of 1 for ionic surfactants in dilute solution. The area A occupied by a surfactant molecule at the solution–air interface can be calculated from A = 1/N A 23Γ 2 where N A is the Avogadro number ( × 10 molecules. The prediction of crystal morphology is important for sensor and device applications, as the morphology reflects the relative rate of growth in different crystallographic directions. Up to now, the geometrical model has not attached with the internal structure of atomic arrangement in the crystal lattice which plays a critical role for the experimentally observed morphology.
This is best illustrated by the effect of anionic and cationic surfactants on the habit of adipic acid crys- tals.3 X-ray analysis showed that the linear six- carbon dicarboxylic acid molecules were aligned end-to-end in a parallel array in the crystal with their long axis parallel to the () faces, so that the () face is made up entirely. Frederick W. Tausch has written: 'Mechanism by which surfactants modify adipic acid crystal growth rate and habit' Asked in Organic Chemistry What are the chemicals used in synthetic fibers?
When ultrasound is applied to a solution for crystallization, it can affect the properties of the crystalline products significantly. Ultrasonic irradiation decreases the induction time and metastable zone and increases the nucleation rate. Due to these effects, it generally yields smaller crystals with a narrower size distribution when compared with conventional crystallizations. Narducci et al. reported a similar trend for the sonocrystallization of adipic acid. To compare the crystal habit of the sonocrystallization crystals (Experiment 8) with that of the conventional crystal (Experiment B2), the crystals were subjected to SEM. The application of power ultrasound resulted in the formation of smaller crystals with a.
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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, Mechanism by which surfactants modify adipic acid crystal growth rate and habit. By Frederick W. (Frederick William) Tausch. Abstract.
by Frederick W. Tausch, (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, es bibliographical references (leaves ). Effect of Surfactants on the Growth and Crystal Habit of Zinc Phosphate Coating.
Transactions of the IMF71 (1), DOI: / Hak-Kim Chan, Igor Gonda. Serendipitous preparation of crystals of methotrexate and attempts to modify its crystal by: Mechanism by which surfactants modify adipic acid crystal growth rate and habit Tausch, Frederick W.
(Frederick William), (Massachusetts Institute of Technology, ) Mechanisms and applications of plant nanobionics . At a concentration of mmol dm(-3) (a concentration corresponding to a molar ratio of approximately octanoic acid:adipic acid), growth on the (1 0 0) face is inhibited, with in situ AFM.
Numerous research papers have reported the severe habit modification observed in adipic acid crystals when doped with relatively low concentrations of alkanoic acids (Fairbrother and Grant,Fairbrother and Grant,Davey et al., ) along with the effects of doping on dissolution rate, crystal energy and density, and melting point (Chow et al.,Chow et al.
Chow et al12 reported such crystals to have modified density, crystal energy, and dissolution rate compared with pure adipic acid crystals.
These effects were interpreted in terms of lattice disorder and defects, ideas later extended by York and Gr 14 into the concept of a “disruption index,” which quantifies changes in lattice entropy resulting from impurity incorporation and solid solution formation.
A Molecular Modeling Study of the Crystal Morphology of Adipic Acid and Its Habit Modification by Homologous Impurities Article in Crystal Growth & Design 5(6) October with 13 Reads.
To check whether adipic acid is soluble in hexane, we performed the following experiment. We added 5 g of adipic acid crystals to mL of hexane in a glass beaker. We stirred the mixture for 24 h at 30 °C.
Subsequently, we separated (by filtration) the undissolved adipic acid from the mother liquor and then we evaporated all the mother liquor. The isothermal (°) growth of crystals of adipic acid from aqueous solution under carefully controlled conditions has been studied as a function of (a) supersaturation level (1 to 13%) and (b.
The effects of surfactants on protein crystallization are, however, still poorly characterized and understood. A few studies have demonstrated that the addition of nonionic surfactants can improve the quality of protein crystals However, little insight is available about the molecular mechanisms by which the surfactants modify.
β-HMX crystals grown at low supersaturations are predicted to have their typical morphology by the spiral growth mechanism. However, when supersaturations are larger than σ2D of the () face, the growth mechanism is shown to change to the 2D nucleation mechanism and thus elongated HMX crystals are obtained due to faster growth of the () face.
Frederick W. Tausch has written: 'Mechanism by which surfactants modify adipic acid crystal growth rate and habit' Asked in Home & Garden, Gardening What is a habit garden. An example of this type is ionic surfactants which interact with the surface carboxyls of an adipic acid crystal.
23 A fourth type is those which reduce the edge free energy of steps so that the two‐dimensional nucleation rate on the perfect surface of the crystals and the rate of step advance increases. 21, 24 MFA seems to belong to the.
A surfactant, dodecyl amine chloride, has an accelerating effect on the dissolution of form A and hinder the growth of form B. Adipic acid slows down the dissolution rate of form A, but has no effect on the growth rate of form B.
The isothermal (°) growth of crystals of adipic acid from aq. soln. under carefully controlled conditions was studied as a function of (a) supersatn. level (1 to 13%) and (b) concn. of various anionic and cationic surfactants (0 to mg./l.), by using a specially designed crystg.
app. Growth rates of the characteristic faces ((), ( Frederick W. Tausch has written: 'Mechanism by which surfactants modify adipic acid crystal growth rate and habit' Asked in History of the United States What problem did rapid growth. Crystallization of Adipic Acid Adipic acid is an example of di-carboxylic acids coming from fermentation upstream process.
Adipic acid is one of the most important dicarboxylic acids. It is mainly used as a precursor for the Nylon production. GEA Messo PT has developed and constructed plants for the crystallization of Adipic acid for more than.
Supercritical Fluid Crystallization of Adipic Acid Using Urea as Habit Modifier Article in Crystal Growth & Design 8(8) August with 41 Reads How we measure 'reads'. References. Hsien‐Hsin Tung. Search for more papers by this author.
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Investigation into the mechanism of action of poloxamers in changing crystal properties A.J. Mackellar a, G. Buckton a-*, J.M. Newton a, C.A. Orr b a School of Pharmacy, University of London, Brunswick Square, London WC1N IAX, UK.
b SmithKline Beecham, Clarenden Road, Worthing, Sussex, UK Received 28 March ; accepted 27 April USA1 US10/, USA USA1 US A1 US A1 US A1 US A US A US A US A1 US A1 US A1 Authority US United States Prior art keywords solution crystals nucleation surface nucleation surface Prior art date Legal status (The .It has been found that non-ionic surfactants have marginal effect on this ionic compound whereas ionic surfactants are able to modify the morphology substantially.
crystal systems: adipic acid.