scholarly journals Water-assisted synthesis of mesoporous calcium carbonate with a controlled specific surface area and its potential to ferulic acid release

RSC Advances ◽  
2020 ◽  
Vol 10 (47) ◽  
pp. 28019-28025
Author(s):  
Kazunori Kadota ◽  
Toi Ibe ◽  
Yuto Sugawara ◽  
Hitomi Takano ◽  
Yus Aniza Yusof ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Ferulic Acid ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Dissolution Profile ◽  
Carbonation Process ◽  
Acid Release

A carbonation process to control the specific surface area of mesoporous calcium carbonate and the dissolution profile of ferulic acid on mesoporous carbonate particles are presented.

Control of the morphology, specific surface area and agglomeration of precipitated calcium carbonate crystals through a multiphase carbonation process

CrystEngComm ◽  
2020 ◽  
Vol 22 (11) ◽  
pp. 1970-1984 ◽  
Author(s):  
Meisam Ghiasi ◽  
Mahmoud Abdollahy ◽  
Mohammad Reza Khalesi ◽  
Ehsan Ghiasi
Keyword(s):  
Calcium Carbonate ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Precipitated Calcium Carbonate ◽  
Carbonation Process

The morphology of precipitated calcium carbonate is a function of conductivity.

Poly (Divinylbenzene) Particles of Large Specific Surface Area Prepared by Dispersion Polymerization

2010 ◽  
Vol 148-149 ◽  
pp. 1281-1285
Author(s):  
Yu Zeng Zhao ◽  
Yong Sheng Li ◽  
Hong Hua Ge ◽  
Qun Jie Xu
Keyword(s):  
Calcium Carbonate ◽  
Specific Surface ◽  
Porous Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Dispersion Polymerization ◽  
Large Specific Surface Area

Porous polydivinylbenzene particles were prepared by dispersion polymerization, using AIBN as initiator, acetonitrile as solvent, calcium carbonate and polypyrrolidone used as dispersion stabilizer and porogen. Ratio of dispersion stabilizer with monomer affects the specific surface area and porous structure. Calcium carbonate and polypyrrolidone used porogen were studied.

Activation of Ca-Based CO2 Sorbent by Hydration in Repetitive Calcination-Carbonation Reactions

2014 ◽  
Vol 587-589 ◽  
pp. 755-760
Author(s):  
Yu Qing Zhao ◽  
Chun Zhen Qiao ◽  
Wei Jiao Chen
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Radius ◽  
Hydration Process ◽  
Cycle Performance ◽  
Performance Study ◽  
Carbonation Process ◽  
Number Of Cycles

The carbonation characteristics of Ca-based CO2 absorbent hydrated by water were investigated as part of a multi-cycle performance study, and the change of the microstructure, pore radius and specific surface area of the absorbent with the number of cycles was researched. The results show that, conversion of sorbent hydrated by water is enhanced to 85% after 10 cycle, significantly higher than the 20% achieved by dry limestone cycle. Because the specific surface area is greatly enhanced, as well as the distributions of pore radius is improved in the hydration process, which develop an effective way to retain the fine qualities of Ca-based CO2 sorbents in a repetitive calcination-carbonation process.

Box-Behnken experimental design for the production of precipitated calcium carbonate

2016 ◽  
Vol 88 (10-11) ◽  
pp. 961-968 ◽  
Author(s):  
Semra Kirboga ◽  
Mualla Öner ◽  
Ozlem Dogan
Keyword(s):  
Calcium Carbonate ◽  
Experimental Design ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Polymer Concentration ◽  
Water Soluble ◽  
Significant Variable ◽  
Application Time ◽  
Water Soluble Polymer

Abstract Calcium carbonate (CaCO3) was synthesized by means of ultrasonic process in the presence of the water-soluble polymer carboxymethyl inulin (CMI). Synthesized CaCO3 crystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET (Brunauer, Emmett and Teller) isotherm. Applying Box-Behnken experimental design, the effects of the amplitude of sonicator (Amp), biopolymer concentration (BC) and the application time of ultrasound (AT) on the preparation of CaCO3 with respect to specific surface area (SSA) of final product was investigated. The experimental design was studied at three levels. The range of the amplitude of sonicator, polymer concentration and the application time of ultrasound were 25%–50%, 0.25–0.75 g/L and 1–5 min, respectively. The model equation representing specific surface area (SSA) of calcium carbonate was expressed as functions of three operating parameters namely the application time of the ultrasound, the amplitude of sonicator and polymer concentration. The results showed that the application time of ultrasound was the most significant variable that influenced the surface area of the crystals among three variables and the experimental results were in good agreement with those predicted by the proposed regression model. The highest value of specific surface area was obtained at the maximum application time of ultrasound.

scholarly journals Potential application of surfactant systems in formulation of dosage forms with slightly soluble substances

2012 ◽  
Vol 66 (5) ◽  
pp. 667-676
Author(s):  
Mladen Milovic ◽  
Jelena Djuris ◽  
Dragana Vasiljevic ◽  
Zorica Djuric ◽  
Svetlana Ibric
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Castor Oil ◽  
High Specific Surface Area ◽  
Homogeneous Distribution ◽  
Dissolution Profile ◽  
Commercial Products ◽  
Hydrogenated Castor Oil ◽  
Surfactant Systems

In order to achieve fast release of ibuprofen, slightly soluble model substance (0.52104 mol/l), surfactant systems for oral use with different PEG-40 hydrogenated castor oil (C)/diethylene glycol monoethyl ether (T) ratios were investigated. Comparison between dissolution profiles for ibuprofen from formulated systems and from two commercial products, film tablets and soft capsules, is presented in this paper. Photon correlation spectroscopy has shown that after high dilution with water, surfactant systems were able to form micellar solutions. The size of micelles varies from 14.8 ? 0,075 nm to 16.2 ? 0,021 nm with increasing C/T ratio from 1:2 to 2:1. Although with increasing content of PEG-40 hydrogenated castor oil larger micelles have formed, lower values of polydispersity index indicated that more homogeneous distribution of micelles size was gained. Conductometric analysis has demonstrated that system composing of C/T ratio 2:1, has shown most pronounced interaction between droplets, which can be seen as high rise of electrical conductivity with increasing water content (% (wwater/wtotal)) in the sample. No significant difference in percolation threshold between formulations with different C/T ratios was observed. Different surfactant systems were adsorbed on magnesium aluminometasilicate, as adsorbent with high specific active surface (?300 m2/g), in order to investigate potential influence of adsorbent on ibuprofen dissolution rate. Formulated systems, with or without adsorbent were filled in hard gelatin capsules. The dissolution profiles of ibuprofen from different formulations were obtained in 30 minutes by dissolution apparatus with rotating baskets and compared with dissolution profiles of ibuprofen from commercial products. For formulations without adsorbent faster release of ibuprofen in first minutes of dissolution test, showed formulations with C/T ratio 2:1 and 1:1. Magnesium aluminometasilicate, as adsorbent with high specific surface area, significantly improved release rate of ibuprofen from formulation with C/T ratio 2:1, but, for formulation with C/T ratio 1:1, significantly lower release of ibuprofen was observed. Formulations with other C/T ratios in terms of fast ibuprofen release did not give satisfying results. Obtained results show that in comparison to dissolution profile of ibuprofen from commercial products proper C/T ratio as well as magnesium aluminometasilicate, as adsorbent with high specific surface area, can significantly increase release of ibuprofen.

Specific surface area and particle size of calcium carbonate precipitated by carbon dioxide microbubbles

2012 ◽  
Vol 198-199 ◽  
pp. 254-260 ◽  
Author(s):  
Jun-Hwan Bang ◽  
Young Nam Jang ◽  
Wonbaek Kim ◽  
Kyung Sun Song ◽  
Chi Wan Jeon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
Calcium Carbonate ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area

Research of Dispersant Quantity in each Stage of Grinding Calcium Carbonate

2013 ◽  
Vol 842 ◽  
pp. 7-12
Author(s):  
De Wei Chen ◽  
Xiao Ling Ge ◽  
Quen Tin Shi ◽  
Yu Tian
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Particle Size Distribution ◽  
Specific Surface ◽  
Surface Treatment ◽  
Surface Area ◽  
Specific Surface Area ◽  
Grinding Process ◽  
Dispersing Agent ◽  
Treatment Agent

By using a surface treatment agent on the surface of calcium carbonate, discussed the variation of the specific surface area of the calcium carbonate during the grinding process, determined the added amount and added time of the dispersing agent, and researched on the grinding effect. According to the changes about the specific surface area of the grinding calcium carbonate particles, compared with the different effects that added the uniform dispersant and added the corresponding needs dispersant, had the particle size relationship followed the change of the specific surface area, reach to the purpose that refine the particle size and get a narrower particle size distribution.

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