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Venkatkarthick R, Davidson DJ, Ravichandran S, Vengatesan S, Sozhan G, Vasudevan S. Eco-friendly and facilely prepared silica modified amorphous titania (TiO2–SiO2) electrocatalyst for the O2 and H2 evolution reactions. Catal Sci Technol 2015. [DOI: 10.1039/c5cy00805k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A silica modified amorphous titania (TiO2–SiO2) electrocatalyst was prepared by a simple, cheap, and scalable preparation procedure. The catalyst is active in the oxygen and hydrogen evolution reactions, leading to a promising bifunctional electrocatalyst.
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Kamaraj R, Davidson DJ, Sozhan G, Vasudevan S. Adsorption of herbicide 2-(2,4-dichlorophenoxy)propanoic acid by electrochemically generated aluminum hydroxides: an alternative to chemical dosing. RSC Adv 2015. [DOI: 10.1039/c5ra03339j] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Flow diagram of pilot plant scale studies for the removal of 2,4-DP.
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Jayamurthy M, Vasudevan S. Temperature Programmed Surface Reaction Studies of the Methanol to Gasoline (MTG) Conversion over ZSM-5. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.199500118] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Vasudevan S, Maddocks M, Chamberlain S, Spinou A, Wood C, Jolley C, Birring SS. P197 Physical Inactivity in Sarcoidosis. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Venkatkarthick R, Elamathi S, Sangeetha D, Balaji R, Suresh Kannan B, Vasudevan S, Jonas Davidson D, Sozhan G, Ravichandran S. Studies on polymer modified metal oxide anode for oxygen evolution reaction in saline water. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.02.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Comer D, Singh P, Vasudevan S. Effective border gateway protocol protection that does not require universal adoption of a public key infrastructure. IET NETWORKS 2012. [DOI: 10.1049/iet-net.2012.0145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Vasudevan S. Functional validation of microRNA-target RNA interactions. Methods 2012; 58:126-34. [PMID: 22910526 DOI: 10.1016/j.ymeth.2012.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 08/05/2012] [Accepted: 08/06/2012] [Indexed: 12/15/2022] Open
Abstract
MicroRNAs are small, non-coding RNA regulators of gene expression with important outcomes in cell state, proliferation, metabolism, immunity and development; their deregulation leads to significant clinical consequences. MicroRNAs and their associated target RNAs can be identified by genetic, bioinformatic and biochemical methods. MicroRNAs can recognize target mRNAs via direct base-pairing and recruit effector complexes to modulate their gene expression in a sequence-specific manner. MicroRNA interactions with target RNAs produce their roles in gene expression. The following are some of the validation methods employed to confirm functionally relevant microRNA interactions with their target mRNAs. Each method involves interference with the microRNA or the target mRNA to disable their interaction, which should lead to loss of microRNA-mediated gene expression if the interaction is functionally consequential. Subsequent alleviation of the interference and restoration of productive base-pairing interactions between the microRNA and target should rescue microRNA-mediated gene expression and confirm the functional requirement for direct microRNA-target mRNA interaction. Characterization of functional microRNA interactions with their target mRNAs will provide significant insights into their gene expression regulatory mechanism and lead to the development of potential therapeutic approaches to manipulate these interactions and their consequent gene expression outcomes.
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Vasudevan S, Lakshmi J. Effect of alternating and direct current in an electrocoagulation process on the removal of cadmium from water. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2012; 65:353-360. [PMID: 22233915 DOI: 10.2166/wst.2012.859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The main objective of this study was to investigate the effects of AC and DC on the removal of cadmium from water using iron as anode and cathode. The various operating parameters on the removal efficiency of cadmium were investigated. The results showed that the optimum removal efficiency of 98.1 and 97.3% with the energy consumption of 0.734 and 1.413 kWh/kL was achieved at a current density of 0.2 A/dm(2), at pH of 7.0 using AC and DC respectively. The adsorption process follows second order kinetics and the temperature studies showed that adsorption was endothermic and spontaneous in nature.
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Seetharaman S, Sozhan G, Ravichandran S, Vasudevan S, Davidson J. Sulfonated Poly (Ether Ether Ketone)-Based Composite Proton-Exchange Membrane for Energy Production. INT J POLYM MATER PO 2011. [DOI: 10.1080/00914037.2010.551359] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Caroline ML, Prakash M, Geetha D, Vasudevan S. Growth, structural, vibrational, optical, laser and dielectric aspects of L-alanine alaninium nitrate single crystal. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:1936-1940. [PMID: 21700493 DOI: 10.1016/j.saa.2011.05.094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 05/22/2011] [Accepted: 05/25/2011] [Indexed: 05/31/2023]
Abstract
Bulk single crystals of l-alanine alaninium nitrate [abbreviated as LAAN], an intriguing material for frequency conversion has been grown from its aqueous solution by both slow solvent evaporation and by slow cooling techniques. The optimized pH value to grow good quality LAAN single crystal was found to be 2.5. The grown crystals were subjected to single crystal X-ray diffraction studies to determine the unit cell dimensions and morphology. Vibrational frequencies of the grown crystals by Fourier transform infrared spectroscopic technique were investigated. Also, the presence of hydrogen and carbon atoms in the grown sample was confirmed using proton and carbon NMR analyses. The dielectric constant and dielectric loss measurements of the as grown crystal at different temperatures and frequencies of the applied field are measured and reported. LAAN has good optical transmission in the entire visible region with cutoff wavelength within the UV region confirms its suitability for device fabrications. The existence of second harmonic generation signals was observed using Nd:YAG laser with fundamental wavelength of 1064 nm. Its Laser Damage Threshold (LDT) was measured and also tested by using a Q-switched Nd:YAG laser and the value of LDT of LAAN is 17.76GW/cm2 respectively, is found to be better than certain organic and semiorganic materials.
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Vasudevan S. CS6.3 The status of antiviral development for dengue. Int J Infect Dis 2011. [DOI: 10.1016/s1201-9712(11)60022-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Seetharaman S, Ravichandran S, Davidson DJ, Vasudevan S, Sozhan G. Polyvinyl Alcohol Based Membrane as Separator for Alkaline Water Electrolyzer. SEP SCI TECHNOL 2011. [DOI: 10.1080/01496395.2011.575427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Naik VV, Chalasani R, Vasudevan S. Composition driven monolayer to bilayer transformation in a surfactant intercalated Mg-Al layered double hydroxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:2308-2316. [PMID: 21319770 DOI: 10.1021/la1047326] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The structure and organization of dodecyl sulfate (DDS) surfactant chains intercalated in an Mg-Al layered double hydroxide (LDH), Mg(1-x)Alx(OH)2, with differing Al/Mg ratios has been investigated. The Mg-Al LDHs can be prepared over a range of compositions with x varying from 0.167 to 0.37 and therefore provides a simple system to study how the organization of the alkyl chains of the intercalated DDS anions change with packing density; the Al/Mg ratio or x providing a convenient handle to do so. Powder X-ray diffraction measurements showed that at high packing densities (x ≥ 0.3) the alkyl chains of the intercalated dodecyl sulfate ions are anchored on opposing LDH sheets and arranged as bilayers with an interlayer spacing of ∼27 Å. At lower packing densities (x < 0.2) the surfactant chains form a monolayer with the alkyl chains oriented flat in the galleries with an interlayer spacing of ∼8 Å. For the in between compositions, 0.2 ≤ x < 0.3, the material is biphasic. MD simulations were performed to understand how the anchoring density of the intercalated surfactant chains in the Mg-Al LDH-DDS affects the organization of the chains and the interlayer spacing. The simulations are able to reproduce the composition driven monolayer to bilayer transformation in the arrangement of the intercalated surfactant chains and in addition provide insights into the factors that decide the arrangement of the surfactant chains in the two situations. In the bilayer arrangement, it is the dispersive van der Waals interactions between chains in opposing layers of the anchored bilayer that is responsible for the cohesive energy of the solid whereas at lower packing densities, where a monolayer arrangement is favored, Coulomb interactions between the positively charged Mg-Al LDH sheets and the negatively charged headgroup of the DDS anion dominate.
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Vasanthavigar M, Srinivasamoorthy K, Vijayaragavan K, Ganthi RR, Chidambaram S, Anandhan P, Manivannan R, Vasudevan S. Application of water quality index for groundwater quality assessment: Thirumanimuttar sub-basin, Tamilnadu, India. ENVIRONMENTAL MONITORING AND ASSESSMENT 2010; 171:595-609. [PMID: 20091344 DOI: 10.1007/s10661-009-1302-1] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Accepted: 12/22/2009] [Indexed: 05/22/2023]
Abstract
An attempt has been made to understand the hydrogeochemical parameters to develop water quality index in Thirumanimuttar sub-basin. A total of 148 groundwater samples were collected and analyzed for major cations and anions. The domination of cations and anions was in the order of Na>Mg>Ca>K for cations and Cl>HCO(3) >SO(4) in anions. The hydrogeochemical facies indicate alkalis (Na and K) exceed alkaline earths (Ca and Mg) and strong acids (Cl and SO(4)) exceed weak acid (HCO(3)). Water quality index rating was calculated to quantify overall water quality for human consumption. The PRM samples exhibit poor quality in greater percentage when compared with POM due to effective leaching of ions, over exploitation of groundwater, direct discharge of effluents and agricultural impact. The overlay of WQI with chloride and EC correspond to the same locations indicating the poor quality of groundwater in the study area. SAR, Na%, and TH were noted higher during both the seasons indicating most of the groundwater locations not suitable for irrigation purposes.
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Nagalingam S, Vasudevan S, Ramasamy P. Effect of Impurities on the Nucleation of ADP from Aqueous Solution. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/crat.2170160604] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sampson C, Thomas JM, Vasudevan S, Wright CJ. A preliminary investigation of the sorption of hydrogen at high pressure by MoS2. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19810901205] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Shukla AK, Ramesh KV, Manoharan R, Sarode PR, Vasudevan S. Preparation and Characterization of Platinized-Carbon Hydrogen Anodes for Alkali and Acid Fuel Cells. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19850891205] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kandasamy A, Mohan R, Lydia Caroline M, Vasudevan S. Nucleation kinetics, growth, solubility and dielectric studies of L-proline cadmium chloride monohydrate semi organic nonlinear optical single crystal. CRYSTAL RESEARCH AND TECHNOLOGY 2008. [DOI: 10.1002/crat.200710980] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Barman S, Vasudevan S. Mixed Saturated−Unsaturated Alkyl-Chain Assemblies: Solid Solutions of Zinc Stearate and Zinc Oleate. J Phys Chem B 2007; 111:5212-7. [PMID: 17441755 DOI: 10.1021/jp068675x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The linear saturated stearic acid and the bent mono-unsaturated oleic acid do not mix and form solid solutions. However, the zinc salts of these acids can. From X-ray diffraction and DSC measurements we show that the layered zinc stearate and zinc oleate salts form a homogeneous solid solution at all composition ratios. The solid solutions exhibit a single melting endotherm, with the melting temperature varying linearly with composition but with the enthalpy change showing a minimum. By monitoring features in the infrared spectra that are characteristic of the global conformation of the hydrocarbon chain, and hence can distinguish between stearate and oleate chains, it is shown that solid solution formation is realized by the introduction of gauche defects in a fraction of the stearate chains that are then no longer linear. This fraction increases with oleate concentration. It has also been possible from the spectroscopic measurements to establish a quantitative relation between molecular conformational order and the thermodynamic enthalpy of melting of the solid solutions.
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Abstract
The melting of alkyl chains in the saturated fatty acid zinc soaps of different chain lengths, Zn(C(n)H(2n+1)COO)(2); n = 11, 13, 15, and 17, have been investigated by powder X-ray diffraction, differential scanning calorimetry, and vibrational spectroscopy. These compounds have a layer structure with the alkyl chains arranged as tilted bilayers and with all methylene chains adopting a planar, all-trans conformation at room temperature. The saturated fatty acid zinc soaps exhibit a single reversible melting transition with the associated enthalpy change varying linearly with alkyl chain length, but surprisingly, the melting temperature remaining constant. Melting is associated with changes in the conformation of the alkyl chains and in the nature of coordination of the fatty acid to zinc. By monitoring features in the infrared spectra that are characteristic of the global conformation of the alkyl chains, a quantitative relation between conformational disorder and melting is established. It is found that, irrespective of the alkyl chain length, melting occurs when 30% of the chains in the soap are disordered. These results highlight the universal nature of the melting of saturated fatty acid zinc soaps and provide a simple explanation for the observed phenomena.
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Abstract
The influence of a double bond in the middle of an otherwise flexible hydrocarbon chain on the melting of such assemblies has been investigated by comparing the melting behavior of zinc stearate and zinc oleate. By monitoring features in the infrared spectra that are characteristic of the global conformation of the hydrocarbon chain, it is shown that the double bond effectively decouples the thermal evolution of conformational disorder in the chain segments on either side of the double bond and the melting of each of these segments in the assembly occurs as independent events.
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Mohanambe L, Vasudevan S. Aromatic Molecules in Restricted Geometries: Pyrene Excimer Formation in an Anchored Bilayer. J Phys Chem B 2006; 110:14345-54. [PMID: 16854141 DOI: 10.1021/jp061695e] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The galleries of an anionic clay, Mg-Al Layered Double Hydroxide (Mg-Al LDH) have been functionalized by intercalating the anionic surfactant do-decyl sulfate. Within the galleries, the alkyl chains of the surfactant adopt a bilayer structure with the sulfate headgroup anchored to the inorganic sheet. Pyrene molecules have been solubilized in the anchored bilayer by partitioning from polar solvents. The presence of pyrene molecules induces conformational disorder in the alkyl chains of the bilayer and more importantly inhibits the rotational disordering motion of the sulfate headgroup. Pyrene fluorescence indicates formation of excimers whose intensity increases with concentration of solubilized pyrene indicating that they are mobile. Pyrene solubilized in the anchored bilayer exhibits unusual phenomena; on evacuation the excimer band disappear but reappears on releasing vacuum. It is shown that this behavior arises due to the loss of water of hydration of the headgroup on evacuation and as a consequence the pyrene moves into the less polar interior of the bilayer where it is immobile and can no longer diffuse and form excimers. The motion of pyrene into the interior of the bilayer creates free space near the surfactant chain termini, which manifests in the disappearance of the methyl-rocking mode of the ordered (-tt) end-chain conformer in the Raman spectra.
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Murali PM, Rajasekaran S, Paramesh P, Krishnarajasekar OR, Vasudevan S, Nalini K, Lakshmisubramanian S, Deivanayagam CN. Plant-based formulation in the management of chronic obstructive pulmonary disease: a randomized double-blind study. Respir Med 2006; 100:39-45. [PMID: 15905081 DOI: 10.1016/j.rmed.2005.04.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2005] [Accepted: 04/08/2005] [Indexed: 11/25/2022]
Abstract
BACKGROUND A randomized double-blind placebo controlled clinical study was undertaken to investigate the safety and efficacy of a plant-based formulation (DCBT1234-Lung KR), which earlier through 2 trials was found to improve FEV1 and the quality of life of COPD patients. OBJECTIVE The efficacy of DCBT1234-Lung KR was assessed using pulmonary function tests, arterial blood gas (ABG) analyses and the clinical symptoms of COPD in a 6-month study period against a matching placebo and a biomedical drug combination (salbutamol+theophylline+bromhexine). METHODS One hundred and five subjects aged between 35 and 85 years with a smoking history of more than 20 pack years, showing little or no improvement in FEV1 upon a bronchial challenge of 200 microg of inhaled salbutamol and exhibiting ABG percentage of less than 85% of oxygen saturation were taken up for the study. The study had 3 arms viz., the plant-based formulation (DCBT1234-Lung KR), placebo and salbutamol (12 mg/day) plus theophylline (300 mg/day) plus bromhexine (24 mg/day). The end point of the study was determined as an improvement of FEV1 by 200 mL and/or increased ABG values (>90% PaO2) and clinical symptoms like dyspnoea, wheezing, cough, expectoration, disability, and sleep disturbances. RESULTS DCBT1234-Lung KR patients showed statistically significant (95% level) improvement in FEV1 and PaO2 in comparison with salbutamol+theophylline+bromhexine and placebo patients. Twenty-three per cent of DCBT1234-Lung KR patients, 19% of salbutamol+theophylline+bromhexine group and 12% of placebo group patients showed the desired 200 mL improvement in FEV1 values in comparison with the other 2 arms. Improved PaO2 was observed in 15.4% of the DCBT1234-Lung KR patients while no improvement was seen with patients in any other arms. Symptoms like dyspnoea, wheezing, cough, expectoration, disability and sleep disturbances also significantly reduced in DCBT1234-Lung KR and the biomedical group patients, but not in the placebo arm. CONCLUSIONS DCBT1234-Lung KR was equivalent, if not better than the present day treatment with salbutamol, theophylline and bromhexine combination in COPD patients and this was ascertained using FEV1 and ABG values.
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Mohanambe L, Vasudevan S. Inclusion of poly-aromatic hydrocarbon (PAH) molecules in a functionalized layered double hydroxide. J CHEM SCI 2006. [DOI: 10.1007/bf02708772] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mohanambe L, Vasudevan S. Structure of a cyclodextrin functionalized anionic clay: XRD analysis, spectroscopy, and computer simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:10735-42. [PMID: 16262345 DOI: 10.1021/la050628t] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Carboxy-methyl beta-cyclodextrin (CMCD) cavities have been intercalated within the galleries of anionic clay, Mg-Al layered double hydroxide (LDH). The cyclodextrin functionalized LDH has been reported to adsorb neutral and nonpolar guest molecules. X-ray diffraction, IR, and Raman vibrational spectroscopy and (13)C CPMAS NMR have been used to characterize the confined CMCD molecules, whereas molecular dynamics simulations have been used to probe the interlayer arrangement and orientation of the intercalated species. Spectroscopic measurements as well as MD simulations show that there is no significant change in the geometry of the CMCD cavity on intercalation. Within the galleries of the anionic clay, the CMCD anions are arranged as bilayers with the carboxy methyl substituents, located at the narrower opening of the bucket-like cyclodextrin toroid, anchored to the LDH sheet. This arrangement leaves the wider opening of the CMCD anion facing away from the layers allowing the interior of the cyclodextrin cavity to be accessible to guest molecules. Finally, the hydrophobicity of the anchored cyclodextrin cavity has been characterized using fluorescence from pyrene included within it.
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