Citric Acid Crystals Research Articles

Triboluminescence and the dynamics of crystal fracture

Triboluminescence appears concurrently with the sudden force decreases in the fracture region of the force versus compression curves of tartaric-acid, sugar, ammonium-tartrate, lithium-sulfate-monohydrate, and citric-acid-monohydrate crystals. This relationship suggests that the motion of cracks and thereby the creation of new surfaces is responsible for the excitation of triboluminescence in these crystals. All of these crystals exhibit triboluminescence from the second positive group of molecular nitrogen. The intensity and time dependence of triboluminescence is measured as a function of the velocity of impact of a piston on single crystals. A quantitative expression for time and impact velocity dependence of the triboluminescence intensity. $I=(\frac{\ensuremath{\eta}\mathrm{bV}{u}^{3}{v}^{3}}{{\ensuremath{\alpha}}^{2}{h}^{3}}){e}^{\ensuremath{-}\ensuremath{\alpha}t}{(1\ensuremath{-}{e}^{\ensuremath{-}\ensuremath{\alpha}t})}^{2}\mathrm{exp}[\ensuremath{-}(\frac{\ensuremath{\beta}{u}^{2}{v}^{2}}{{\ensuremath{\alpha}}^{2}{h}^{2}}){(\ensuremath{-}{e}^{\ensuremath{-}\ensuremath{\alpha}t})}^{2}],$ is derived from the movement and the interaction of mobile cracks. This equation explains the observed dependence of the triboluminescence intensity on the impact velocity, the applied stress, the temperature, and the crystal dimensions. The values of $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ are determined from triboluminescence measurements. $\ensuremath{\alpha}$ is related to the viscosity of the crystal and $\ensuremath{\beta}$ is related to the attrition coefficient of mobile cracks in the crystal. The triboluminescence activity decreases over three orders of magnitude from sugar to citric-acid crystals.

Choix d'une méthode de détermination des vitesses de croissance cristalline en couche fluidisée: Application à la croissance de cristaux d'acid

The growth rate of citric acid crystals in fluidized beds was determined experimentally from a limited number of observations involving wide variat The results are compared with those obtained in previous experiments using standard methods. The main advantage of the new technique is a considerable

Comparaison entre la dissolution et la croissance de Cristaux d'Acide citrique monohydrate en lit Fluidisé

The authors present an orginal method for the treatment of experimental data relative to the growth and dissolution of monohydrate citric acid crystals in a fluidized bed at 25°C. Comparison between two sets of experiments shows clearly that the crystal growth rate is limited by a diffusional mass transfer process. The results are correlated according to Sh = 0.121 Re 0.183 Ga 0.306 Sc 1/3 and discussed.

Rate of growth of citric acid crystals

Rate of growth of citric acid crystals

Effect of dialysis on direct crystallization of citric acid from lemon juice

Effect of dialysis on direct crystallization of citric acid from lemon juice

Effect of Dialysis on Direct Crystallization of Citric Acid from Lemon Juice

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Dialysis on Direct Crystallization of Citric Acid from Lemon JuiceH. D. PooreCite this: Ind. Eng. Chem. 1923, 15, 8, 775–778Publication Date (Print):August 1, 1923Publication History Published online1 May 2002Published inissue 1 August 1923https://doi.org/10.1021/ie50164a002RIGHTS & PERMISSIONSArticle Views60Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (574 KB) Get e-Alerts