scholarly journals Synthesis and properties of porous CLEAs lipase by the calcium carbonate template method and its application in biodiesel production

RSC Advances ◽  
2019 ◽  
Vol 9 (51) ◽  
pp. 29665-29675 ◽  
Author(s):  
Changlin Miao ◽  
Huiwen Li ◽  
Xinshu Zhuang ◽  
Zhongming Wang ◽  
Lingmei Yang ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Specific Surface ◽  
Catalytic Effect ◽  
Biodiesel Production ◽  
Template Method ◽  
Complete Structure ◽  
Calcium Carbonate Template

Porous cross-linked enzyme aggregates (p-CLEAs) were synthesized. This p-CLEAs presented a complete structure with abundant channels, large specific surface and more efficient catalytic effect compared with conventional CLEAs.

scholarly journals The Effects of Magnetic Nanoparticles Incorporated in Polyelectrolyte Capsules

2017 ◽  
Vol 54 (4) ◽  
pp. 630-634
Author(s):  
Carmen Stavarache ◽  
Mircea Vinatoru ◽  
Timothy Mason ◽  
Larysa Paniwnyk
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Calcium Carbonate ◽  
Ferric Oxide ◽  
Iron Content ◽  
Single Layer ◽  
Oxide Nanoparticles ◽  
Polyelectrolyte Multilayer ◽  
The Core ◽  
Calcium Carbonate Template

Polyelectrolyte multilayer capsules are synthesized comprising of 12 total layers each containing a single layer of iron oxide nanoparticles in shells 4, 6, 8 or 10. A protein-labelled dye is embedded in the calcium carbonate template core as a model for the encapsulation of a drug. The core is dissolved after 6 layers are formed. Two types of magnetic nanoparticles are incorporated into various capsule shells: ferric oxide (Fe2O3, 50 nm) and iron oxide (Fe3O4, 15 nm), a 1:1 (vol.) mixture of the two types of nanoparticles suspensions is also used. Nanoparticle inclusion reduces the capsule sizes in all cases with the order of effect Fe3O4 [ Fe2O3 [ Fe2O3/Fe3O4 mixture. When Fe3O4 or a Fe2O3/Fe3O4 mixture is incorporated in layer 6 the reduction in size of the final capsules is less than expected. The number of surviving capsules containing nanoparticles are lower than control regardless of which of the nanoparticles is used but here the effect of Fe3O4 or a mixture of the two types of nanoparticles incorporated in layer 6 was slightly out of step. The amount of iron incorporated is almost the same regardless of which shell the nanoparticles were incorporated but the iron content using 50 nm nanoparticles is generally slightly higher than that obtained with 15 nm nanoparticles.

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.

Mathematical Modeling of Biodiesel Production under Intense Agitation

2016 ◽  
Vol 14 (1) ◽  
pp. 445-451
Author(s):  
Aliakbar Roosta ◽  
Jafar Javanmardi ◽  
Elham Sadat Behineh
Keyword(s):  
Mass Transfer ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Rapeseed Oil ◽  
Catalyst Concentration ◽  
Biodiesel Production ◽  
Transfer Coefficients ◽  
Increasing Temperature ◽  
Intense Agitation

AbstractIn this study, a new approach is proposed to investigate the kinetics of sunflower oil and rapeseed oil transesterification in the presence of potassium hydroxide. Transesterification is a heterogeneous process which affected by a number of parameters, that are not readily available in the literature, such as mass transfer coefficients, partition coefficients, and specific surface area of the dispersed phase. However, under intense agitation condition, mass transfer restrictions may be neglected, and the two phases are supposed to remain in thermodynamic equilibrium, during the process. Therefore, a model was developed independent of the mass transfer coefficient and specific surface area, which is reliable for the intense agitation condition. According to the results, the model is valid at least for mixing rates over 500 rpm. The results of the model were used to study the effects of temperature, methanol-to-oil ratio, and catalyst concentration on the biodiesel conversion. Biodiesel production rate increases with increasing temperature, although rapeseed oil transesterification is more temperature dependent. The results show that the maximum amount of catalyst concentration is less than 1% (by weight); however, the optimum value depends on the operating temperature. The optimum value of the methanol-to-oil-ratio decreases with increasing temperature. Thus, at higher temperatures, less amount of methanol and catalyst are required, which leads to easier purification of biodiesel.

Synthesis of Nano Grade Hollow Silica Sphere via a Soft Template Method

2008 ◽  
Vol 8 (6) ◽  
pp. 3097-3100 ◽  
Author(s):  
Ming-Shyong Tsai ◽  
Miao Ju Li ◽  
Fu-Hsu Yen
Keyword(s):  
Specific Surface ◽  
Porous Structure ◽  
Colloidal Silica ◽  
Solvent System ◽  
Silica Sphere ◽  
Soft Template ◽  
Template Method ◽  
Hollow Silica ◽  
The Mean ◽  
Outside Diameter

The nano grade hollow silica sphere (HSS) was synthesized by a novel soft template method. We found that the precipitate of aluminate had a porous structure that could be the soft template for HSS. After mixing the colloidal silica with the aluminate precipitate, the bubble trapped in this porous structure could form the nano grade HSS. The aluminate precipitate was removed by adjusting the pH of the slurry to ∼1. The outside diameter, the specific surface, and the mean pore size diameter of the forming HSS were 60∼90 nm, 571 m2/g, and 3 nm, respectively. The formed HSS was collected by modifying the surface with Si(OCH3)3CHCH2 (VTMO) and then filtrating the precipitated gel in the n-butanol and ethanol solvent system.

Synthesis and Characterization of Nanostructured Tungsten Oxide by Hard Template Method

2014 ◽  
Vol 896 ◽  
pp. 78-81
Author(s):  
Teruhisa Hongo ◽  
Yoshihiro Usami ◽  
Atsushi Yamazaki
Keyword(s):  
Mesoporous Silica ◽  
Specific Surface ◽  
Tungsten Oxide ◽  
Surface Area ◽  
Synthesis And Characterization ◽  
Template Method ◽  
Nanorod Arrays ◽  
Hard Template ◽  
Hard Template Method

Nanostructured WO3 was synthesized by a hard template method using platelet-shaped mesoporous silica SBA-15. The nanostructured WO3 consisted of nanorod arrays comprised of mixed crystalline tetragonal and monoclinic phases with the diameter of 8.5 nm and the length of 170-300 nm. The specific surface area was 30 m2/g, which was about 6 times higher compared to that synthesized without the template.

Catalytic effect of alkali carbonates on the calcination of calcium carbonate

1987 ◽  
Vol 115 ◽  
pp. 57-62 ◽  
Author(s):  
Jin-Mo Huang ◽  
Kenneth E. Daugherty
Keyword(s):  
Calcium Carbonate ◽  
Catalytic Effect

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.

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