Hydrogen adsorption on mesoporous silica microtubules fabricated through the self-assembly of alpha-cyclodextrin and pluronic F127 surfactant

2013 IEEE 8th Nanotechnology Materials and Devices Conference (NMDC) Pub Date : 2013-10-01 DOI:10.1109/NMDC.2013.6707453

S. Deulkar, W. Lai, Jow-Lay Huang

{"title":"Hydrogen adsorption on mesoporous silica microtubules fabricated through the self-assembly of alpha-cyclodextrin and pluronic F127 surfactant","authors":"S. Deulkar, W. Lai, Jow-Lay Huang","doi":"10.1109/NMDC.2013.6707453","DOIUrl":null,"url":null,"abstract":"Morphology of mesoporous silica has been transformed from spherical to ellipsoidal form due to the structure directing role of alpha-cyclodextrin. The product exhibits a well ordered pore structure as deciphered from the SAXRD and TEM measurements. SEM studies indicate that the samples without alpha-cyclodextrin possess a spherical form with diameters ranging from 1.5 micron to 2.5 micron. These are transformed into a cylindrical structure with aspect ratio ranging from 2.1 to 4.7. FTIR spectra reveal distinct peaks corresponding to Si-O linkage. The Brunauer-Emmett-Teller (BET) pore surface area and the pore size for the samples, range from 2.7 to 612 m2 / gm and 3.89 to 10.95 nm respectively. The formation mechanism of the elongated cylindrical mesoporous silica is proposed to occur based on the hydrophilic and hydrophobic nature existent within cyclic alpha - cyclodextrin. The stoichiometric quotient qexp captures the degree of inclusion of alpha - cyclodextrin in the Pluronic precursor. A plot of BET pore surface area vs. qexp , reveals that samples with similar qexp but with low TEOS concentration have higher BET pore surface area than those prepared with higher TEOS concentrations. This trend correlates with the hydrogen adsorption properties of the synthesized mesoporous samples, wherein samples with larger BET pore surface area, exhibit enhanced hydrogen adsorption capacity.","PeriodicalId":112068,"journal":{"name":"2013 IEEE 8th Nanotechnology Materials and Devices Conference (NMDC)","volume":"179 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2013 IEEE 8th Nanotechnology Materials and Devices Conference (NMDC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NMDC.2013.6707453","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Morphology of mesoporous silica has been transformed from spherical to ellipsoidal form due to the structure directing role of alpha-cyclodextrin. The product exhibits a well ordered pore structure as deciphered from the SAXRD and TEM measurements. SEM studies indicate that the samples without alpha-cyclodextrin possess a spherical form with diameters ranging from 1.5 micron to 2.5 micron. These are transformed into a cylindrical structure with aspect ratio ranging from 2.1 to 4.7. FTIR spectra reveal distinct peaks corresponding to Si-O linkage. The Brunauer-Emmett-Teller (BET) pore surface area and the pore size for the samples, range from 2.7 to 612 m2 / gm and 3.89 to 10.95 nm respectively. The formation mechanism of the elongated cylindrical mesoporous silica is proposed to occur based on the hydrophilic and hydrophobic nature existent within cyclic alpha - cyclodextrin. The stoichiometric quotient qexp captures the degree of inclusion of alpha - cyclodextrin in the Pluronic precursor. A plot of BET pore surface area vs. qexp , reveals that samples with similar qexp but with low TEOS concentration have higher BET pore surface area than those prepared with higher TEOS concentrations. This trend correlates with the hydrogen adsorption properties of the synthesized mesoporous samples, wherein samples with larger BET pore surface area, exhibit enhanced hydrogen adsorption capacity.

查看原文本刊更多论文

环糊精和pluronic F127表面活性剂自组装制备的介孔二氧化硅微管对氢的吸附

由于-环糊精的结构导向作用，介孔二氧化硅的形貌由球形转变为椭球状。通过SAXRD和TEM测量，该产品显示出有序的孔隙结构。SEM研究表明，不含α -环糊精的样品呈球形，直径在1.5 ~ 2.5微米之间。它们被转换成一个圆柱形结构，宽高比从2.1到4.7不等。FTIR光谱显示Si-O键对应的明显峰。样品的BET孔表面积和孔径分别为2.7 ~ 612 m2 / gm和3.89 ~ 10.95 nm。基于环α -环糊精的亲疏水性，提出了长圆柱介孔二氧化硅的形成机理。化学计量商qexp捕获了-环糊精在Pluronic前体中的包合程度。从BET孔表面积与qexp的关系图可以看出，qexp相似但TEOS浓度较低的样品比TEOS浓度较高的样品具有更高的BET孔表面积。这种趋势与合成的介孔样品的吸氢性能有关，其中BET孔表面积越大的样品，其吸氢能力就越强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

2013 IEEE 8th Nanotechnology Materials and Devices Conference (NMDC)

自引率

0.00%

发文量