PEG-templated mesoporous silicas using silicate precursor and their applications in desiccant dehumidification cooling systems

Setyawan, Heru; Yuwana, Minta; Balgis, Ratna

doi:10.1016/j.micromeso.2015.07.009

Cited by 23 publications

(15 citation statements)

References 25 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bands are metal-oxygen bands that correspond to the intrinsic stretching frequencies of the tetrahedral and octahedral sites, respectively, of the inverse cubic spinel of Fe3O4 [27,31]. For samples Si150-MNP and Si200-MNP, other bands (1080, 996 and 624 cm -1 ) that can be attributed to Si-O-Si and Si-O stretching corresponding to SiO2 appear [32,33]. Moreover, the band at 561 cm -1 is possibly due to the Fe−O−Si stretching vibrations caused by perturbation of the metallic ion in SiO4 [27].…”

Section: Adsorption Kinetic Experimentsmentioning

confidence: 99%

Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal

Setyawan

Widiyastuti

Mahmudi

et al. 2018

J. Pow. Tech. Adv. Funct. Mater.

Self Cite

View full text Add to dashboard Cite

Abstract:In this paper, the synthesis of silica-coated magnetite nanoparticles using a one-step electrochemical method and their application for dye removal are presented. In this method, pure iron in a dilute aqueous sodium silicate solution that served as a silica precursor was electro-oxidized. The silica-coated magnetite nanoparticles produced by this method is nearly spherical with the size of approximately 10 nm and follows the spinel structure of Fe3O4. The silica-coated magnetite nanoparticles exhibit nearly superparamagnetic properties and excellent performance to remove methylene blue from wastewater. The adsorption capacity of the nanoparticles was approximately 24.2 mg methylene blue/g adsorbent, which was much higher than that of pure magnetite nanoparticles (1.1 mg methylene blue/g adsorbent). Also, the percentage removal was higher than 90% with the initial concentration of methylene blue up to 40 mg/L. It can be regenerated and reused with an only slight reduction in percentage removal.

show abstract

Section: Adsorption Kinetic Experimentsmentioning

confidence: 99%

Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal

Setyawan

Widiyastuti

Mahmudi

et al. 2018

J. Pow. Tech. Adv. Funct. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Porous materials were obtained by condensation in the presence of PEG 88,164 or similar surfactants and emulsiers such as Span-80 and Tween-80.…”

mentioning

confidence: 99%

Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

et al. 2017

View full text Add to dashboard Cite

Silicon is among the most abundant elements on the Earth. It occurs in many minerals and plays an important role in several biochemical processes. Some living organisms use silicon dioxide as a substrate for building elements of their bodies. Unicellular diatom algae build frustules from silicon dioxide. The skeleton of siliceous sponges is a silicaprotein composite. Similarly, rice hulls which protect seeds, contain silica as an important component. The living organisms assimilate silicon from the environment in the form of silicic acid. However, the biochemical mechanisms involved in the transformation of silicic acid to solid siliceous materials are still poorly understood.Evidently, condensation of silicic acid in the living organisms proceeds under control of biopolymers and it is important to know how various types of polymers influence the condensation. Bio-inspired chemistry involving the interaction between polymeric silicic acid and functional polymers results in interesting composite materials, including nanoparticles and bulk materials. This review contains a brief description of the mechanism of silicic acid condensation in aqueous medium and also includes a discussion on various precursors of silicic acid. The main focus of the review is on the influence of polymers bearing nitrogen and oxygen-containing functional groups on silicic acid condensation starting from monomer to three-dimensional polymer. Influence of molecular weight of the organic polymer on the condensation and structure of the resulting product is also elaborated. The biological importance of the obtained data and strategies for novel applications of the synthesized composite materials are described in the concluding section of the review. The biomimetic condensation processes open up new vistas for development of novel materials and applications in the biomedical and process industries.

show abstract

“…Silica (SiO 2 ) after pretreatment had the steepest peak of 22.64° and an intensity count of 185 as shown in Figure 3 . Based on the data, silica scaling before pretreatment has a crystallinity of 40% [ 9 ] whereas after treatment it has a crystallinity of 20% ( Figure 3 ). This is due to the purification and milling processes carried out that are capable of breaking the silica crystal structure into irregular (amorphous) structures.…”

Section: Resultsmentioning

confidence: 99%

“…The hydrophobicity can be inferred by the surface roughness and silane agent ratio [ 29 ]. Moreover, the smoother surface, such as in Figure 16 b, implies that different solvent exchange can affect the roughness due to the level of the crystallinity depending on how much HMDS is dissolved in the superhydrophobic solution [ 9 ].…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Coating Derived from Geothermal Silica to Enhance Material Durability of Bamboo Using Hexadimethylsilazane (HMDS) and Trimethylchlorosilane (TMCS)

et al. 2021

View full text Add to dashboard Cite

Bamboo, a fast-growing plant from Asia, is used as building material with unique properties, while exhibiting fast degradation due to its hydrophobicity. Therefore, many attempts have been implemented using several technologies for bamboo modification to alter the hydrophobicity. Most previous studies producing superhydrophobic properties are conducted by using tetraethoxysilane (TEOS) as a precursor agent. However, this method, using TEOS with harmful properties and unaffordable compounds, requires many steps to accomplish the experimental method. Therefore, this paper employed geothermal solid waste as a silica source of the precursor. Thus, an effective and efficient method was applied to prepare superhydrophobic coating by using a precursor of geothermal silica and further modification using hexamethyldisilazane (HMDS) and trimethylchlorosilane (TMCS). The research was executed by the full factorial statistical method using two numerical variables (HMDS/TMCS concentration and silica concentration) and one categorical variable (solvent types). The uncoated material revealed higher weight gain in mass and moisture content than that of the coated bamboo after the soil burial test to assess the durability of the bamboo. However, the durability of superhydrophobic coating realized hydrophobic performance for both agents during sand abrasion for a total of 120 s at an angle of 45°. Statistical results showed the optimum contact angle (CA) achieved in superhydrophobic performance with lower silica concentration for HMDS concentration and the appropriate solvent of n-hexane for HMDS and iso-octane for TMCS. All results were supported using many instruments of analysis to confirm the step-by-step alteration of geothermal silica to be used as a superhydrophobic coating, such as XRF, XRD, FTIR, SEM, and SEM EDX.

show abstract

PEG-templated mesoporous silicas using silicate precursor and their applications in desiccant dehumidification cooling systems

Cited by 23 publications

References 25 publications

Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal

Silica-coated magnetite nanoparticles prepared by the one-step electrochemical method for dye removal

Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

Superhydrophobic Coating Derived from Geothermal Silica to Enhance Material Durability of Bamboo Using Hexadimethylsilazane (HMDS) and Trimethylchlorosilane (TMCS)

Contact Info

Product

Resources

About