Cyclodextrin-Based Solid–Gas Clathrates

Pereva, Stiliyana; Himitliiska, Tsveta; Spassov, Тony; Stoyanov, Simeon D.; Arnaudov, Luben N.; Dudev, Todor

doi:10.1021/acs.jafc.5b01357

Cited by 17 publications

(14 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, Kuji et al demonstrated that the methane hydrate formation rate increased by up to five times after the addition of β-cyclodextrin polymer in water. Similar promoting effects were reported by Nozawa et al Nevertheless, it should be noted that the cyclodextrins have been widely used for gas storage in the food industry, which mainly compressed the gas into the interior cavity of cyclodextrin at high pressure to form a gas–cyclodextrin complexation either in liquid solution or in solid powder. − …”

Section: Introductionsupporting

confidence: 75%

Molecular Mechanisms for Cyclodextrin-Promoted Methane Hydrate Formation in Water

Chen

2017

J. Phys. Chem. C

View full text Add to dashboard Cite

Cyclodextrins were used as environmentally friendly additives to overcome the slow kinetics of hydrate formation that limited the industrial application of gas hydrate technology. Microsecond molecular dynamics simulations were performed to identify the degree and the underlying mechanisms of the cyclodextrin effects on the methane hydrate formation rate by the four-body order parameter and molecular configurations and to clarify the hydrate structure in the presence of cyclodextrin by face-saturated incomplete cage analysis. Overall results indicated that the addition of β-cyclodextrin in water facilitated the hydrate growth rate, promoted the formation of thermodynamically stable hydrate structure, and enhanced the methane storage capacity. It highlighted the role of cyclodextrin to facilitate the formation of water channel bridging hydrate and water (at low ratio of gas to water) and to increase the gas−water interfacial curvature (at high ratio of gas to water) on the accelerated kinetics of hydrate growth. The advantages of the cyclodextrin-promoted gas hydrate approach for gas storage were also highlighted by comparing it with the gas hydrate formation using other additives and the gas−cyclodextrin complexation method.

show abstract

Section: Introductionsupporting

confidence: 75%

Molecular Mechanisms for Cyclodextrin-Promoted Methane Hydrate Formation in Water

Chen

2017

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…As an active gas, ethylene is often stored in pressurized cylinders for commercial use, which has the major disadvantages of leakage and explosion during transport and storage. Encapsulating gas into solid matrices with slow release properties can effectively avoid these defects . These solid matrices can be categorized into two groups using X-ray diffraction techniques: (i) ordered structures with well-defined pore size, such as carbon nanotubes and zeolites, and (ii) disordered structures with a wide range of pore diameters and surface areas, e.g., activated carbons and cyclodextrins .…”

Section: Introductionmentioning

confidence: 99%

“…Encapsulating gas into solid matrices with slow release properties can effectively avoid these defects. 2 These solid matrices can be categorized into two groups using X-ray diffraction techniques: 3 (i) ordered structures with welldefined pore size, such as carbon nanotubes 4 and zeolites, 5 and (ii) disordered structures with a wide range of pore diameters and surface areas, e.g., activated carbons 6 and cyclodextrins. 7 These solid matrices with low gas encapsulation capability normally need to be prepared under harsh conditions, which is a major drawback for industrial use.…”

Section: ■ Introductionmentioning

confidence: 99%

Encapsulation of Ethylene Gas into Granular Cold-Water-Soluble Starch: Structure and Release Kinetics

Shi

Tan

et al. 2017

J. Agric. Food Chem.

View full text Add to dashboard Cite

Ethylene gas was introduced into granular cold-water-soluble (GCWS) starches using a solid encapsulation method. The morphological and structural properties of the novel inclusion complexes (ICs) were characterized using scanning electron microscopy, X-ray diffractometry, and Raman spectroscopy. The V-type single helix of GCWS starches was formed through controlled gelatinization and ethanol precipitation and was approved to host ethylene gas. The controlled release characteristics of ICs were also investigated at various temperature and relative humidity conditions. Avrami's equation was fitted to understand the release kinetics and showed that the release of ethylene from the ICs was accelerated by increasing temperature or RH and was decelerated by increased degree of amylose polymerization. The IC of Hylon-7 had the highest ethylene concentration (31.8%, w/w) among the five starches, and the IC of normal potato starch showed the best controlled release characteristics. As a renewable and inexpensive material, GCWS starch is a desirable solid encapsulation matrix with potential in agricultural and food applications.

show abstract

“…Current research of carbonaceous adsorbent for CO 2 separation mainly focuses on how to improve the adsorption capacity and selectivity via two ways: (1) to improve the surface area and pore structure of the adsorbents either using different precursors or fabricating different structures, such as ordered mesoporous carbon, single-walled carbon nanotubes (CNTs), multi-walled CNTs, , graphene, and other polymer materials, , and (2) to increase alkalinity by chemical modification on the surface with some alkali substances (e.g., NaOH, KOH, , and −NH 2 − ). To date, cyclodextrin applications have been mainly intended for the entrapment of small molecules, stabilization of reactive intermediates, and catalysis through encapsulation and as potential molecular transport and drug delivery devices. − The investigations of CO 2 encapsulation and complexation with cyclodextrins have indicated that β-cyclodextrin (β-CD) could form cyclodextrin-based nanosponges with inclusion of CO 2 , , whereas not form “cyclodextrin–gas” clathrates with CO 2 by crystallization from water solution of β-CD . A supramolecular system of aniline encapsulated into β-CD cavity was studied to achieve a high amine efficiency of 0.85 mol of CO 2 /mol of N with dry carbon dioxide gas .…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics of Carbon Dioxide Gas on a Solid Acid Derivative of β-Cyclodextrin

et al. 2017

View full text Add to dashboard Cite

A solid acid derivative of β-cyclodextrin was synthesized as an adsorbent for CO 2 capture. The adsorption characteristics, such as adsorption capacity, selectivity, and uptake rate, under different temperatures and gas pressures were analyzed. The results from scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer−Emmett−Teller (BET) sorption, Fourier transform infrared spectroscopy, andthermogravimetric analysis indicated that the dehydration and grafting of sulfonic groups changed the structure of β-cyclodextrin aggregates into a relatively homogeneous porous structure with a concave−convex surface. Meanwhile, the specific BET surface area and pore volume of the solid acid derivative were increased by 40 and 37 times compared to β-cyclodextrin aggregates. Thereby, the performance of the solid acid derivative of βcyclodextrin toward CO 2 sorption was significantly enhanced, in which CO 2 adsorption capacity at 3.5 bar was increased to 1.78 mmol/g and the selectivity of CO 2 over N 2 , O 2 , and CH 4 at 298 K reached 7. Interestingly, there was no adsorption of nitrogen on the as-prepared solid acid derivative at 77 K based on BET sorption. Lowering the temperature is disadvantageous for N 2 adsorption but helpful to promote CO 2 capture, so that the high selectivity of CO 2 to N 2 sorption can be achieved.

show abstract

Cyclodextrin-Based Solid–Gas Clathrates

Cited by 17 publications

References 45 publications

Molecular Mechanisms for Cyclodextrin-Promoted Methane Hydrate Formation in Water

Molecular Mechanisms for Cyclodextrin-Promoted Methane Hydrate Formation in Water

Encapsulation of Ethylene Gas into Granular Cold-Water-Soluble Starch: Structure and Release Kinetics

Adsorption Characteristics of Carbon Dioxide Gas on a Solid Acid Derivative of β-Cyclodextrin

Contact Info

Product

Resources

About