Chitosan−Silica Complex Membranes from Sulfonic Acid Functionalized Silica Nanoparticles for Pervaporation Dehydration of Ethanol−Water Solutions

Liu, Ying‐Ling; Hsu, Cheng‐Hsing; Su, Yu‐Sheng; Lai, Juin‐Yih

doi:10.1021/bm049531w

Cited by 193 publications

(106 citation statements)

References 46 publications

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“…Silica nanoparticles (SNP) with a size of 10-20 nm were purchased from Nissan Chemical Company. Sulfonated silica nanoparticles (SA-SNP) were obtained by sulfonation of SNP according to the reported method [35,36]. The sulfur content of SA-SNP was 1.82 wt% by elemental analysis, which corresponds to a sulfonic acid equivalent concentration of 0.5687 mol g −1 for SA-SNP.…”

Section: Methodsmentioning

confidence: 99%

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Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Liu

Wang

et al. 2009

Journal of Power Sources

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We explore an approach to effectively enhance the properties of cost-effective hydrocarbon protonexchange membranes for application in the direct methanol fuel cell (DMFC). This approach utilizes sulfonated silica nanoparticles (SA-SNP) as additives to modify sulfonated poly(arylene ether ether ketone ketone) (SPAEEKK). The interaction between the sulfonic acid groups of SA-SNP and those of SPAEEKK combined with hydrophilic-hydrophobic phase separation induce the formation of proton conducting channels, as evidenced by TEM images, which contribute to increases in the proton conductivity of the SPAEEKK/SA-SNP nanocomposite membrane. The presence of SA-SNP nanoparticles also reduces methanol crossover in the membrane. Therefore, the SPAEEKK/SA-SNP nanocomposite membrane shows a high selectivity, which is 2.79-fold the selectivity of Nafion ® 117. The improved selectivity of the SPAEEKK/SNP nanocomposite membrane demonstrates potential of this approach in providing hydrocarbon-based PEMs as alternatives to Nafion in direct methanol fuel cells.

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Section: Methodsmentioning

confidence: 99%

“…The theoretical IEC value of SPAEEKK is about 1.30 mmol g −1 , and that of SA-SNP is approximately 0.58 mmol g −1 according to the literature [33,35]. The theoretical values of SPAEEKK nanocomposite membranes were calculated based on composition.…”

Section: Ion Exchange Capacity Water Uptake and Fixed Ion Concentratmentioning

confidence: 99%

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Liu

Wang

et al. 2009

Journal of Power Sources

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“…Sulfonation represents another method of SiO 2 NPs surface modification that has been used to produce chitosan-silica complex membranes (Liu et al, 2005). In the present study, sulfonation of SiO 2 NPs was used for the modification of the surface of SiO 2 NPs to study alternative methods of ionic immobilization of adenosine.…”

Section: Discussionmentioning

confidence: 98%

Silicon-containing nanocarriers for targeted drug delivery: synthesis, physicochemical properties and acute toxicity

et al. 2015

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Silicon-containing nanoparticles (NPs) are considered promising drug carriers for targeted drug delivery. In this study, we investigated the physical and chemical properties of siliconcontaining NPs, including silica and organomodified silica NPs (SiO 2 NPs and OrSiO 2 NPs, respectively), with different surface modifications, with the aim of increasing drug-loading efficiency. In addition, we described the original synthesis methods of different sizes of OrSiO 2 NPs, as well as new hybrid OrSiO 2 NPs with a silica core (SiO 2 + OrSiO 2 NPs). Animal experiments revealed that the silicon-containing NPs investigated were non-toxic, as evidenced by a lack of hemodynamic response after intravenous administration. Bioelimination studies showed rapid renal excretion of OrSiO 2 NPs. In drug release kinetics studies, adenosine was immobilized on SiO 2 NPs using three different approaches: physical adsorption, ionic, and covalent bonding. We observed that the rate of adenosine desorption critically depended on the type of immobilization; therefore, adenosine release kinetics can be adjusted by SiO 2 NP surface modification technique. Adsorption of adenosine on SiO 2 + OrSiO 2 NPs resulted in a significant attenuation of adenosine-induced hypotension and bradycardia.

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“…15 Silicon and metal oxides (eg, ZnO and TiO 2 ) are often used as nanofillers owing to their superior mechanical properties. 16 As the physical, chemical, and mechanical properties of the nanomaterial are superior to those of conventional biomaterials, they become a better choice for cardiovascular applications.…”

Section: Introductionmentioning

confidence: 99%

Multifaceted prospects of nanocomposites for cardiovascular grafts and stents

Vellayappan¹,

Balaji²,

Subramanian³

et al. 2015

IJN

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Cardiovascular disease is the leading cause of death across the globe. The use of synthetic materials is indispensable in the treatment of cardiovascular disease. Major drawbacks related to the use of biomaterials are their mechanical properties and biocompatibility, and these have to be circumvented before promoting the material to the market or clinical setting. Revolutionary advancements in nanotechnology have introduced a novel class of materials called nanocomposites which have superior properties for biomedical applications. Recently, there has been a widespread recognition of the nanocomposites utilizing polyhedral oligomeric silsesquioxane, bacterial cellulose, silk fibroin, iron oxide magnetic nanoparticles, and carbon nanotubes in cardiovascular grafts and stents. The unique characteristics of these nanocomposites have led to the development of a wide range of nanostructured copolymers with appreciably enhanced properties, such as improved mechanical, chemical, and physical characteristics suitable for cardiovascular implants. The incorporation of advanced nanocomposite materials in cardiovascular grafts and stents improves hemocompatibility, enhances antithrombogenicity, improves mechanical and surface properties, and decreases the microbial response to the cardiovascular implants. A thorough attempt is made to summarize the various applications of nanocomposites for cardiovascular graft and stent applications. This review will highlight the recent advances in nanocomposites and also address the need of future research in promoting nanocomposites as plausible candidates in a campaign against cardiovascular disease.

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Chitosan−Silica Complex Membranes from Sulfonic Acid Functionalized Silica Nanoparticles for Pervaporation Dehydration of Ethanol−Water Solutions

Cited by 193 publications

References 46 publications

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Silicon-containing nanocarriers for targeted drug delivery: synthesis, physicochemical properties and acute toxicity

Multifaceted prospects of nanocomposites for cardiovascular grafts and stents

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