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Agudelo NA, Echeverri-Cuartas CE, López BL. Composite Membranes Based on Functionalized Mesostructured Cellular Foam Particles and Sulfonated Poly(Ether Ether Sulfone) with Potential Application in Fuel Cells. MEMBRANES 2022; 12:1075. [PMID: 36363630 PMCID: PMC9692639 DOI: 10.3390/membranes12111075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 10/25/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Composite polymeric membranes were designed based on sulfonated poly(ether ether sulfone) (sPEES) and mesostructured cellular foam (MCF) silica nanoparticles functionalized with organic compounds. Parameters such as molecular weight (MW) of the polymer, nature of the functional group of the MCF silica, and percentage of silica charge were evaluated on the final properties of the membranes. Composite membrane characterization was carried out on their water retention capacity (high MW polymer between 20-46% and for the low MW between 20-60%), ion exchange capacity (IEC) (high MW polymer between 0.02 mmol/g-0.07 mmol/g and low MW between 0.03-0.09 mmol/g) and proton conductivity (high MW polymer molecular between 15-70 mS/cm and low MW between 0.1-150 mS/cm). Finally, the membrane prepared with the low molecular weight polymer and 3% wt. of functionalized silica with sulfonic groups exhibited results similar to Nafion® 117.
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Affiliation(s)
- Natalia A. Agudelo
- Grupo de Investigación e Innovación en Formulaciones Químicas/Escuela de Ingeniería y Ciencias Básicas, Universidad EIA, Calle 23 AA Sur Nro. 5-200, Kilómetro 2+200 Variante al Aeropuerto José María Córdova, Envigado 055428, Antioquia, Colombia
| | - Claudia E. Echeverri-Cuartas
- Grupo de Investigación en Ingeniería Biomédica (GIBEC)/Escuela de Ciencias de la Vida, Universidad EIA, Calle 23 AA Sur Nro. 5-200, Kilómetro 2+200 Variante al Aeropuerto José María Córdova, Envigado 055428, Antioquia, Colombia
| | - Betty L. López
- Grupo de Ciencia de los Materiales/Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Dirección: calle 67 No. 53-108, Medellín 050004, Antioquia, Colombia
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2
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Vandervelden C, Jystad A, Peters B, Caricato M. Predicted Properties of Active Catalyst Sites on Amorphous Silica: Impact of Silica Preoptimization Protocol. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01849] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Craig Vandervelden
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Amy Jystad
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Baron Peters
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Department of Chemistry and Biochemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Marco Caricato
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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3
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Gallego-Villada LA, Alarcón EA, Villa AL. Effect of Colombian raw materials on the Prins condensation reaction over Sn/MCM-41. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.10.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Mérida-Morales S, García-Sancho C, Oregui-Bengoechea M, Ginés-Molina M, Cecilia J, Arias P, Moreno-Tost R, Maireles-Torres P. Influence of morphology of zirconium-doped mesoporous silicas on 5-hydroxymethylfurfural production from mono-, di- and polysaccharides. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.02.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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The study of active sites for producing furfural and soluble oligomers in fructose conversion over HZSM-5 zeolites. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.110411] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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6
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Krishna NV, Anuradha S, Ganesh R, Kumar VV, Selvam P. Sulfonic Acid Functionalized Ordered Mesoporous Silica and their Application as Highly Efficient and Selective Heterogeneous Catalysts in the Formation of 1,2-Monoacetone-D-glucose. ChemCatChem 2018. [DOI: 10.1002/cctc.201801462] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nunna V. Krishna
- National Centre for Catalysis Research and Department of Chemistry; Indian Institute of Technology-Madras; Chennai 600 036 India
| | - Sankaran Anuradha
- National Centre for Catalysis Research and Department of Chemistry; Indian Institute of Technology-Madras; Chennai 600 036 India
| | - Reddi Ganesh
- National Centre for Catalysis Research and Department of Chemistry; Indian Institute of Technology-Madras; Chennai 600 036 India
| | - Velisoju V. Kumar
- National Centre for Catalysis Research and Department of Chemistry; Indian Institute of Technology-Madras; Chennai 600 036 India
| | - Parasuraman Selvam
- National Centre for Catalysis Research and Department of Chemistry; Indian Institute of Technology-Madras; Chennai 600 036 India
- School of Chemical Engineering and Analytical Science; The University of Manchester; Manchester M13 9PL United Kingdom
- Department of Chemical and Process Engineering; University of Surrey Guildford; Surrey GU2 7XH United Kingdom
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7
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Iqbal S, Yun JI. Decontamination of radionuclides by functionalized mesoporous silica under gamma irradiation. RSC Adv 2018; 8:32211-32220. [PMID: 35547485 PMCID: PMC9086197 DOI: 10.1039/c8ra05939j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 09/11/2018] [Indexed: 11/21/2022] Open
Abstract
Schiff base functionalized mesoporous silica (SA-SBA-15) was synthesized by the co-condensation method to remove the radioactive corrosion products from contaminated water coming from nuclear installations.
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Affiliation(s)
- Sajid Iqbal
- Department of Nuclear and Quantum Engineering
- KAIST
- Daejeon 34141
- Republic of Korea
- Chemistry Division
| | - Jong-Il Yun
- Department of Nuclear and Quantum Engineering
- KAIST
- Daejeon 34141
- Republic of Korea
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8
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Maronna MM, Kruissink EC, Parton RF, Soulimani F, Weckhuysen BM, Hoelderich WF. Spectroscopic study on the active site of a SiO2 supported niobia catalyst used for the gas-phase Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam. Phys Chem Chem Phys 2016; 18:22636-46. [DOI: 10.1039/c6cp03014a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Formation of a Brønsted-acidic site out of a Lewis-acidic mono-oxo NbO4 surface species and ethanol, catalysed by a Lewis-basic molecule, e.g. pyridine or cyclohexanone oxime.
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Affiliation(s)
- M. M. Maronna
- DSM Chemical Technology R&D B.V
- 6167 RD Geleen
- The Netherlands
- TU Dortmund
- Lehrstuhl für Technische Chemie B
| | - E. C. Kruissink
- DSM Chemical Technology R&D B.V
- 6167 RD Geleen
- The Netherlands
| | - R. F. Parton
- DSM Chemical Technology R&D B.V
- 6167 RD Geleen
- The Netherlands
| | - F. Soulimani
- Utrecht University
- Inorganic Chemistry and Catalysis Group
- Debye Institute for Nanomaterials Science
- 3584 CG Utrecht
- The Netherlands
| | - B. M. Weckhuysen
- Utrecht University
- Inorganic Chemistry and Catalysis Group
- Debye Institute for Nanomaterials Science
- 3584 CG Utrecht
- The Netherlands
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9
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Kanyal SS, Singh B, Cushman CV, Jankowski DT, Linford MR. Hydroxylation of the silica in microfabricated thin layer chromatography plates as probed by time-of-flight secondary ion mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5713] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Supriya S. Kanyal
- Department of Chemistry and Biochemistry; Brigham Young University; Provo UT 84602 USA
| | - Bhupinder Singh
- Department of Chemistry and Biochemistry; Brigham Young University; Provo UT 84602 USA
| | - Cody V. Cushman
- Department of Chemistry and Biochemistry; Brigham Young University; Provo UT 84602 USA
| | - Daniel T. Jankowski
- Department of Chemistry and Biochemistry; Brigham Young University; Provo UT 84602 USA
| | - Matthew R. Linford
- Department of Chemistry and Biochemistry; Brigham Young University; Provo UT 84602 USA
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Edwards JK, Parker SF, Pritchard J, Piccinini M, Freakley SJ, He Q, Carley AF, Kiely CJ, Hutchings GJ. Effect of acid pre-treatment on AuPd/SiO2catalysts for the direct synthesis of hydrogen peroxide. Catal Sci Technol 2013. [DOI: 10.1039/c2cy20767b] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Bernal C, Sierra L, Mesa M. Application of Hierarchical Porous Silica with a Stable Large Porosity for β-Galactosidase Immobilization. ChemCatChem 2011. [DOI: 10.1002/cctc.201100174] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Yamaguchi A, Namekawa M, Kamijo T, Itoh T, Teramae N. Acid−Base Equilibria inside Amine-Functionalized Mesoporous Silica. Anal Chem 2011; 83:2939-46. [DOI: 10.1021/ac102935q] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akira Yamaguchi
- College of Science and Frontier Research Center for Applied Atomic Sciences, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
| | - Manato Namekawa
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Toshio Kamijo
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Tetsuji Itoh
- Research Center for Compact Chemical System, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Norio Teramae
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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14
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Gallo JMR, Bisio C, Gatti G, Marchese L, Pastore HO. Physicochemical characterization and surface acid properties of mesoporous [Al]-SBA-15 obtained by direct synthesis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5791-5800. [PMID: 20297832 DOI: 10.1021/la903661q] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work, [Al]-SBA-15 samples were prepared by three different direct synthesis methods and one postsynthesis procedure, aiming to study the influence of the preparation procedures on their structural, textural, and physicochemical features. To this aim, samples were investigated by combining different experimental techniques (XRD, N(2) physisorption, (27)Al-MAS NMR, and IR spectroscopy). All preparation methods led to the formation of aluminum-containing SBA-15 samples. Nevertheless, depending on the preparation procedure, samples exhibited different structural, textural, and surface characteristics, especially in terms of Brønsted and Lewis acid sites content. [Al]-SBA-15(1) was synthesized by the pH-adjusting method and presented the lowest surface area and pore volumes. Its surface displayed three families of medium and one family of high strength Brønsted acid sites. The Brønsted/Lewis ratio was 3.49. [Al]-SBA-15(2) and [Al]-SBA-15(3) were synthesized by prehydrolysis of the silica and the aluminum precursors. In [Al]-SBA-15(2), ammonium fluoride was used as silica condensation catalyst. These two materials presented similar surface area, pore diameters and volumes, and Brønsted acidity. The Brønsted/Lewis acid sites ratio were 3.07 and 2.15 for [Al]-SBA-15(2) and [Al]-SBA-15(3), respectively. The [Al]-SBA-15(P) obtained by postsynthesis alumination displayed surface area similar to that of [Al]-SBA-15(3), Brønsted/Lewis acid sites ratio of 2.75, and Brønsted acidity similar to that of [Al]-SBA-15(1). The presence of extra-framework aluminum oxide was identified only on [Al]-SBA-15(3) and [Al]-SBA-15(P).
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Affiliation(s)
- Jean Marcel R Gallo
- Grupo de Peneiras Moleculares Micro e Mesoporosas, Instituto de Química, UNICAMP, R. Monteiro Lobato, 270, CEP 13084-971, Campinas-SP, Brazil
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15
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Murray DK. The characterization of phospholipid functional group probe species on respirable silicon-containing dusts by solid-state 13C and 31P nuclear magnetic resonance spectroscopy. APPLIED SPECTROSCOPY 2010; 64:328-336. [PMID: 20223070 DOI: 10.1366/000370210790918427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Solid-state nuclear magnetic resonance (NMR) spectroscopic studies are reported for the interactions of probe molecules with respirable silicon-containing dusts as experimental evidence complementing computational studies reported by Snyder and Madura recently in J. Phys. Chem. B 112, 7095 (2008). The selected probe molecules represent the individual functional groups of a model lung surfactant dipalmitoylphosphatidyl choline (DPPC) deposited on a respirable silica and kaolin from water solution. (13)C and (31)P solid-state NMR spectroscopies were employed to detect chemical shift, line width, and chemical shift anisotropy, providing experimental evidence of mobility and relaxation changes describing the site and orientation of surface-associated species. NMR results confirm that only the phosphate and adjacent carbons are immobilized by surface hydroxyls on kaolin, while these and the carbons of the cationic head group are likewise immobilized by surface silanols on Miu-U-Sil 5. The phosphates in phosphoryl- and phosphatidyl-cholines were the primary interaction sites, with additional weak coordination with the trimethylammonium cation species. Covalent Al-O-P formation is not likely a factor in in vivo or in vitro toxicity mechanisms of respirable silicon-containing materials, but is rather the result of dehydration or demethoxylation reactions occurring over time or during heating or reduced pressure used in preparing materials for NMR spectroscopic study. Hydration is a critical factor in the formation and preparation for spectroscopic observation of coated dusts. Care must be taken to ensure that products formed and studied correspond to species formed in vivo under suitable concentration and hydration conditions.
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Affiliation(s)
- David K Murray
- National Institute for Occupational Safety and Health, Health Effects Laboratory Division, 1095 Willowdale Road, MS/3030, Morgantown, West Virginia 26505, USA.
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16
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Yamaguchi A, Kamijo T, Teramae N. Characterization of the Inner Space of Mesostructured Silica by Time-Resolved Fluorescence Spectroscopy. BUNSEKI KAGAKU 2009. [DOI: 10.2116/bunsekikagaku.58.507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Akira Yamaguchi
- Department of Chemistry, Graduate School of Science, Tohoku University
| | - Toshio Kamijo
- Department of Chemistry, Graduate School of Science, Tohoku University
| | - Norio Teramae
- Department of Chemistry, Graduate School of Science, Tohoku University
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17
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Seki T, Ikariya T. In situ diffuse reflectance infrared Fourier transform spectroscopy of MCM-41 mesoporous silica: mechanistic consideration on the chemical fixation of CO2 with N,N′-dimethylethylenediamine to 1,3-dimethyl-2-imidazolidinone. Phys Chem Chem Phys 2009; 11:10073-9. [DOI: 10.1039/b912106d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Tsunetake Seki
- Department of Applied Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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18
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Kamijo T, Yamaguchi A, Suzuki S, Teramae N, Itoh T, Ikeda T. Solvation Dynamics of Coumarin 153 in Alcohols Confined in Silica Nanochannels. J Phys Chem A 2008; 112:11535-42. [DOI: 10.1021/jp8034743] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toshio Kamijo
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Akira Yamaguchi
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Shintaro Suzuki
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Norio Teramae
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Tetsuji Itoh
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
| | - Takuji Ikeda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, and Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Nigatake 4-2-1, Miyagino-ku, Sendai 983-8551, Japan
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19
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Giraldo LF, López BL, Pérez L, Urrego S, Sierra L, Mesa M. Mesoporous Silica Applications. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/masy.200751215] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Ovens C, Sievwright D, Silcock AJ. Unusual retention behaviour of 4-substituted piperidines on polybutadiene and polystyrene coated zirconia by comparison to reverse phase silica. J Chromatogr A 2006; 1137:56-62. [PMID: 17054970 DOI: 10.1016/j.chroma.2006.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Revised: 09/26/2006] [Accepted: 10/03/2006] [Indexed: 11/17/2022]
Abstract
The retention properties of a range of N-methylated and N-des-methyl 4-substituted piperidines on polybutadiene (PBD) and polystyrene (PS) coated zirconia have been studied and compared to those of Xterra RP(18) and Genesis C(18) silica. The effect of buffer type and pH are investigated with regard to the elution order on all three stationary phases. The change in the elution order is linked to the degree of substitution of the piperidine nitrogen and appears to be independent of the rest of the structure, indicating that this moiety is most heavily involved in the separation mechanism on the zirconia phases.
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Affiliation(s)
- Caroline Ovens
- Analytical Development, S15 Laboratory Block, PAR&D, AstraZeneca, Silk Road Business Park, Macclesfield, Cheshire SK10 2NA, UK
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21
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Efremenko I, Matatov-Meytal U, Sheintuch M. Hydrodenitrification with PdCu Catalysts: Catalyst Optimization by Experimental and Quantum Chemical Approaches. Isr J Chem 2006. [DOI: 10.1560/68vm-a6tf-kd75-f5b0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Zhou CF, Wang YM, Cao Y, Zhuang TT, Huang W, Chun Y, Zhu JH. Solvent-free surface functionalized SBA-15 as a versatile trap of nitrosamines. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b514317a] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Yamaguchi A, Yoda T, Suzuki S, Morita K, Teramae N. Diffusivities of Tris(2,2'-bipyridyl)ruthenium inside Silica-Nanochannels Modified with Alkylsilanes. ANAL SCI 2006; 22:1501-7. [PMID: 17159306 DOI: 10.2116/analsci.22.1501] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The apparent diffusion coefficients of tris(2,2'-bipyridyl)ruthenium ([Ru(bpy(3))](2+)) are estimated in silica-nanochannels which are assembled inside columnar alumina pores in an anodic alumina membrane, and are modified with alkylsilanes such as trimethylchlorosilane (C1), butyldimethylchlorosilane (C4), and dodecyldimethylchlorosilane (C12). The estimation is performed by observing the lag-time, which is defined as the time required for [Ru(bpy)(3)](2+) to diffuse through alkylsilane-modified silica-nanochannels in the alumina membrane. When ethanol is used as a solvent, the apparent diffusion coefficients of [Ru(bpy)(3)](2+) are estimated as 2.1 x 10(-10) and 3.2 x 10(-10) cm(2) s(-1) in the C1- and C4-modified silica-nanochannels, respectively. These values are about 10(4) times smaller than that obtained in bulk ethanol. Based on the experimental results on the solvent dependency of the lag-time, the hydrogen-bonding interaction between ethanol molecules is considered to be stronger in the C1- and C4-modified silica-nanochannels than in bulk ethanol, and the hydrogen-bonding interaction plays a critical role for the slow diffusivity in those nanochannels. In contrast, the apparent diffusion coefficient in the C12-modified silica-nanochannel is at least two orders of magnitude larger than those in the C1- and C4-modified silica-nanochannels. This relatively fast diffusion is most likely explained by the presence of a long alkyl chain of C12, which reduces a hindrance effect that is originates in the hydrogen-bonding interaction.
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Affiliation(s)
- Akira Yamaguchi
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
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Fujiwara M, Yamamoto F, Okamoto K, Shiokawa K, Nomura R. Adsorption of Duplex DNA on Mesoporous Silicas: Possibility of Inclusion of DNA into Their Mesopores. Anal Chem 2005; 77:8138-45. [PMID: 16351166 DOI: 10.1021/ac0516638] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is well known that a silica surface cannot adsorb duplex DNA in common aqueous solution (not chaotropic solution) because of the electrostatic repulsion of the silica surface and polyanionic DNA. However, we recently found that when duplex DNA in phosphoric acid form (or in acidic solution) was used, DNA was successfully adsorbed into mesoporous silicas even in low-salt aqueous solution. The adsorption behaviors of DNA into mesoporous silicas were influenced by the pore diameter sizes. Mesoporous silicas with 2.80- or 3.82-nm peak pore diameters adsorbed DNA the best in diluted NaCl solution. Formation of the hydrogen bond between P(O)OH groups in DNA and adsorbed water, SiOH groups, or both on silica surfaces is regarded as a main factor in this adsorption. The coincidence of the pore sizes and DNA diameter realizes this unique adsorption promoted by the effect of encompassing DNA with the inner surface of mesoporous silica. Although there is no clear direct evidence for including duplex DNA in the mesopores yet, this adsorption technique is expected to provide a new tool for DNA science, because DNA in the pore size 2-5 nm in diameter has to be in unusual disentangled thread form.
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Affiliation(s)
- Masahiro Fujiwara
- Kansai Center, National Institute of Advanced Industrial Science and Technology, 1 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
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25
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Catalytic conversion of α-pinene by using mesoporous aluminosilicates. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0167-2991(05)80508-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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26
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Adaptation of silanol groups in mesoporous silica to be silylated and their evaluation by ftir. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0167-2991(04)80851-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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