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Several organic salts based on the combination of two different choline derivative cations and MnCl3−, GdCl4− and TbCl4− as anions were immobilized in mesoporous silica nanoparticles (MSNs) by a two-step synthetic method.
Andreia Forte; Sandra Gago; Manuela Lopes Ribeiro Carrott; Peter J. M. Carrott; Celso Alves; Fernando Teodoro; Rui Pedrosa; Isabel M. Marrucho; Luis C. Branco. Mesoporous silica nanoparticles with manganese and lanthanide salts: synthesis, characterization and cytotoxicity studies. Dalton Transactions 2021, 50, 8588 -8599.
AMA StyleAndreia Forte, Sandra Gago, Manuela Lopes Ribeiro Carrott, Peter J. M. Carrott, Celso Alves, Fernando Teodoro, Rui Pedrosa, Isabel M. Marrucho, Luis C. Branco. Mesoporous silica nanoparticles with manganese and lanthanide salts: synthesis, characterization and cytotoxicity studies. Dalton Transactions. 2021; 50 (24):8588-8599.
Chicago/Turabian StyleAndreia Forte; Sandra Gago; Manuela Lopes Ribeiro Carrott; Peter J. M. Carrott; Celso Alves; Fernando Teodoro; Rui Pedrosa; Isabel M. Marrucho; Luis C. Branco. 2021. "Mesoporous silica nanoparticles with manganese and lanthanide salts: synthesis, characterization and cytotoxicity studies." Dalton Transactions 50, no. 24: 8588-8599.
Mesoporous silica nanoparticles (MSNs) are very promising nanomaterials for treating bacterial infections when combined with pharmaceutical drugs. Herein, we report the preparation of two nanomaterials based on the immobilization of ciprofloxacin in mesoporous silica nanoparticles, either as the counter-ion of the choline derivative cation (MSN-[Ch][Cip]) or via anchoring on the surface of amino-group modified MSNs via an amide bond (MSN-Cip). Both nanomaterials were characterized by TEM, FTIR and solution 1H NMR spectroscopies, elemental analysis, XRD and N2 adsorption at 77 K in order to provide the desired structures. No cytotoxicity from the prepared mesoporous nanoparticles on 3T3 murine fibroblasts was observed. The antimicrobial activity of the nanomaterials was determined against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Klebsiella pneumoniae) bacteria and the results were promising against S. aureus. In the case of B. subtilis, both nanomaterials exhibited higher antimicrobial activity than the precursor [Ch][Cip], and in the case of K. pneumoniae they exhibited higher activity than neutral ciprofloxacin.
Blanca De Juan Mora; Luís Filipe; Andreia Forte; Miguel Santos; Celso Alves; Fernando Teodoro; Rui Pedrosa; Manuela Ribeiro Carrott; Luís Branco; Sandra Gago. Boosting Antimicrobial Activity of Ciprofloxacin by Functionalization of Mesoporous Silica Nanoparticles. Pharmaceutics 2021, 13, 218 .
AMA StyleBlanca De Juan Mora, Luís Filipe, Andreia Forte, Miguel Santos, Celso Alves, Fernando Teodoro, Rui Pedrosa, Manuela Ribeiro Carrott, Luís Branco, Sandra Gago. Boosting Antimicrobial Activity of Ciprofloxacin by Functionalization of Mesoporous Silica Nanoparticles. Pharmaceutics. 2021; 13 (2):218.
Chicago/Turabian StyleBlanca De Juan Mora; Luís Filipe; Andreia Forte; Miguel Santos; Celso Alves; Fernando Teodoro; Rui Pedrosa; Manuela Ribeiro Carrott; Luís Branco; Sandra Gago. 2021. "Boosting Antimicrobial Activity of Ciprofloxacin by Functionalization of Mesoporous Silica Nanoparticles." Pharmaceutics 13, no. 2: 218.
Activated carbon fibres with a range of pore sizes, prepared from pre-oxidized acrylic fibre by physical activation in CO2 at different temperatures and times, were investigated as adsorbents for the inhalation anaesthetic isoflurane (2-chloro-2-(difluoromethoxy)-1,1,1-trifluoroethane). Adsorption–desorption isotherms of isoflurane were determined at 293 K and were analysed by the αS method using reference adsorption data, determined also at 293 K, on non-porous carbon. One of the samples obtained showed a much higher adsorption uptake at 100 mbar than reported in previous studies on different materials, while another sample not only showed a higher adsorption uptake than reported previously, but also a higher adsorption uptake at a pressure as low as 1 mbar showing potential for the capture of isoflurane. The results indicate that isoflurane does not adsorb in fine ultramicropores, of width less than about 0.5 nm. Comparison of the pore size distributions of these materials indicated that the presence of supermicropores, as well as ultramicropores, is relevant for the adsorption of isoflurane even at trace levels. Reference adsorption data for isoflurane on non-porous carbon is also presented.
M. Ribeiro Carrott; P. J. M. Carrott; P. F. M. M. Correia. Adsorption of the inhalation anaesthetic isoflurane by activated carbon fibres with reference data on non-porous carbon. Adsorption 2020, 26, 627 -632.
AMA StyleM. Ribeiro Carrott, P. J. M. Carrott, P. F. M. M. Correia. Adsorption of the inhalation anaesthetic isoflurane by activated carbon fibres with reference data on non-porous carbon. Adsorption. 2020; 26 (4):627-632.
Chicago/Turabian StyleM. Ribeiro Carrott; P. J. M. Carrott; P. F. M. M. Correia. 2020. "Adsorption of the inhalation anaesthetic isoflurane by activated carbon fibres with reference data on non-porous carbon." Adsorption 26, no. 4: 627-632.
P.J.M. Carrott; M.M.L. Ribeiro Carrott; P.F.M.M. Correia. Evolution of porosity of activated carbon fibres prepared from pre-oxidized acrylic fibres. Microporous and Mesoporous Materials 2018, 264, 176 -180.
AMA StyleP.J.M. Carrott, M.M.L. Ribeiro Carrott, P.F.M.M. Correia. Evolution of porosity of activated carbon fibres prepared from pre-oxidized acrylic fibres. Microporous and Mesoporous Materials. 2018; 264 ():176-180.
Chicago/Turabian StyleP.J.M. Carrott; M.M.L. Ribeiro Carrott; P.F.M.M. Correia. 2018. "Evolution of porosity of activated carbon fibres prepared from pre-oxidized acrylic fibres." Microporous and Mesoporous Materials 264, no. : 176-180.
The aim of the study was to investigate a rather oxidising atmosphere such as air for the development of a microporous activated carbon from demineralised kraft lignin. Demineralisation of lignin makes the precursor low in reactivity and hence can allow the use of more oxidising atmospheres. Control of the activation conditions allowed development of microporous activated carbons with type I N2 adsorption isotherms from demineralised kraft lignin having micropore volumes and mean micropore widths up to 0.374 cm3 g−1 and 1.12 nm, respectively. A unique feature of this study is to prepare high surface area (1305 m2 g−1) microporous activated carbon at a high temperature (950 °C) in air atmosphere. The effect of temperature on the surface area, micropore volume, mean micropore width and total pore volume was also studied for the development of activated carbons from the precursor in the range 550–1050 °C
Suhas; P.J.M. Carrott; M.M.L. Ribeiro Carrott; Randhir Singh; L.P. Singh; Monika Chaudhary. An innovative approach to develop microporous activated carbons in oxidising atmosphere. Journal of Cleaner Production 2017, 156, 549 -555.
AMA StyleSuhas, P.J.M. Carrott, M.M.L. Ribeiro Carrott, Randhir Singh, L.P. Singh, Monika Chaudhary. An innovative approach to develop microporous activated carbons in oxidising atmosphere. Journal of Cleaner Production. 2017; 156 ():549-555.
Chicago/Turabian StyleSuhas; P.J.M. Carrott; M.M.L. Ribeiro Carrott; Randhir Singh; L.P. Singh; Monika Chaudhary. 2017. "An innovative approach to develop microporous activated carbons in oxidising atmosphere." Journal of Cleaner Production 156, no. : 549-555.
The applicability of the n-nonane pre-adsorption method for characterising the porosity in clays is presented. Na-SD, a Na+-exchanged purified bentonite, and materials obtained by Al3+-exchange and acid treatments of Na-SD and SAz-1 were used. Nitrogen adsorption isotherms, at −196 °C, were determined before and after n-nonane pre-adsorption on each of the samples. In all materials, n-nonane remained adsorbed in ultramicropores after outgassing at 25 °C. Outgassing at higher temperatures (50, 75 and 200 °C) removed nonane and ultramicropores became available for nitrogen adsorption. All treatments on Na-SD led to increase in micropore volume. Larger ultramicropore and supermicropore volumes were obtained for Na-SD acid activated with HCl at 95 °C than for treatments at 25 °C with HCl or following Al3+-exchange (Al-SD), and increased with increasing acid concentration to 3 M. Activation with 4 M HCl led to the largest pore volume with contribution from mesopores. However, the specific external surface area was the same as that obtained for Na-SD, Al-SD and for most of the other acid activated samples. Treatments at 95 °C with 1 M and 6 M HCl promoted increase in specific external surface area. The micropore volumes and specific external surface area for SAz-1 treated with 1 M HCl at 95 °C were larger than those of Al-SAz-1, but lower than those obtained for corresponding materials derived from Na-SD. The n-nonane pre-adsorption method enabled micropore volumes and specific external surface areas to be obtained for all samples.
Manuela Ribeiro Carrott; Isabel Pestana Da Paixão Cansado; P.J.M. Carrott; Patrícia Russo; Paula Castilho; C. Fernandes; C. Catrinescu; C. Breen. Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorption. Microporous and Mesoporous Materials 2016, 232, 238 -247.
AMA StyleManuela Ribeiro Carrott, Isabel Pestana Da Paixão Cansado, P.J.M. Carrott, Patrícia Russo, Paula Castilho, C. Fernandes, C. Catrinescu, C. Breen. Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorption. Microporous and Mesoporous Materials. 2016; 232 ():238-247.
Chicago/Turabian StyleManuela Ribeiro Carrott; Isabel Pestana Da Paixão Cansado; P.J.M. Carrott; Patrícia Russo; Paula Castilho; C. Fernandes; C. Catrinescu; C. Breen. 2016. "Porosity in ion-exchanged and acid activated clays evaluated using n-nonane pre-adsorption." Microporous and Mesoporous Materials 232, no. : 238-247.
In this study, we report the use of clay-based catalysts in the methoxylation of limonene, for the selective synthesis of α-terpinyl methyl ether. Na-SAz-1, Ca-SWy-2 and Sap-Ca source clays and a montmorillonite (SD) from Porto Santo, Madeira Archipelago, Portugal were modified by (i) ion-exchange with Al, Fe, Ni and Na and (ii) acid activation, to produce catalysts with markedly different acidic and textural properties. The lack of activity of Ni2+-SAz-1 (with Lewis acidity maximized), provided evidence that the process occurs preferentially on Brönsted acid sites. The catalysts based on the high layer-charge SAz-1 montmorillonite proved to be the most active. Ion-exchange with Al3+, followed by thermal activation at 150 °C, afforded the highest number of Brønsted acid sites located in the clay gallery and this coincided with the maximum catalytic activity. The influence of various reaction conditions, to maximize limonene conversion and selectivity, was studied over Al-SAz-1. When the reaction was performed for 20 h at 40° C, the conversion reached 71% with 91% selectivity to the mono-ether. Mild acid activation (1 M HCl, 30 min, reflux) of the raw SAz-1 clay leads to a material with a good catalytic behaviour (slightly inferior to Al-SAz-1), while any increase in the severity of the acid-treatment (6 M HCl, 30 min, reflux), caused a marked decrease in catalytic activity.
C. Catrinescu; Cesar Fernandes; Paula Castilho; C. Breen; M.M.L. Ribeiro Carrott; I.P.P. Cansado. Selective methoxylation of limonene over ion-exchanged and acid-activated clays. Applied Catalysis A: General 2013, 467, 38 -46.
AMA StyleC. Catrinescu, Cesar Fernandes, Paula Castilho, C. Breen, M.M.L. Ribeiro Carrott, I.P.P. Cansado. Selective methoxylation of limonene over ion-exchanged and acid-activated clays. Applied Catalysis A: General. 2013; 467 ():38-46.
Chicago/Turabian StyleC. Catrinescu; Cesar Fernandes; Paula Castilho; C. Breen; M.M.L. Ribeiro Carrott; I.P.P. Cansado. 2013. "Selective methoxylation of limonene over ion-exchanged and acid-activated clays." Applied Catalysis A: General 467, no. : 38-46.
Development of quantitative theory of adsorption-induced deformation is important, e.g., for enhanced coalbed methane recovery by CO2 injection. It is also promising for the interpretation of experimental measurements of elastic properties of porous solids. We study deformation of mesoporous silica by n-pentane adsorption. The shape of experimental strain isotherms for this system differs from the shape predicted by thermodynamic theory of adsorption-induced deformation. We show that this difference can be attributed to the difference of disjoining pressure isotherm, responsible for the solid–fluid interactions. We suggest the disjoining pressure isotherm suitable for n-pentane adsorption on silica and derive the parameters for this isotherm from experimental data of n-pentane adsorption on nonporous silica. We use this isotherm in the formalism of macroscopic theory of adsorption-induced deformation of mesoporous materials, thus extending this theory for the case of weak solid–fluid interactions. We employ the extended theory to calculate solvation pressure and strain isotherms for SBA-15 and MCM-41 silica and compare it with experimental data obtained from small-angle X-ray scattering. Theoretical predictions for MCM-41 are in good agreement with the experiment, but for SBA-15 they are only qualitative. This deviation suggests that the elastic modulus of SBA-15 may change during pore filling.
Gennady Yu. Gor; Oskar Paris; Johannes Prass; Patrícia Russo; Manuela Ribeiro Carrott; Alexander V. Neimark. Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation. Langmuir 2013, 29, 8601 -8608.
AMA StyleGennady Yu. Gor, Oskar Paris, Johannes Prass, Patrícia Russo, Manuela Ribeiro Carrott, Alexander V. Neimark. Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation. Langmuir. 2013; 29 (27):8601-8608.
Chicago/Turabian StyleGennady Yu. Gor; Oskar Paris; Johannes Prass; Patrícia Russo; Manuela Ribeiro Carrott; Alexander V. Neimark. 2013. "Adsorption of n-Pentane on Mesoporous Silica and Adsorbent Deformation." Langmuir 29, no. 27: 8601-8608.
Ten different amines of different molar mass and structure were deposited from aqueous and methanolic solutions of different concentrations onto two types of carbon aerogel. Thermogravimetric analysis (TGA) was used to quantify the loading, thermal stability and CO2 capture capacity of the materials. Our results show that the amount of amine deposited did not depend on the solvent used, but was generally greater from more concentrated solutions, and increased with increasing molar mass. Deposition of amines was principally achieved by adsorption onto the mesopore walls, but without complete pore filling, and also, in some cases, by adsorption in the aerogel micropores. It was also concluded that the thermal stability of the amines deposited on the walls of the mesopores was independent of the solvent used, concentration or aerogel type. Preliminary studies of CO2 adsorption–desorption were carried out and a good correlation between ln(Cn) and 1/T, where Cn is the capacity at temperature T, was found. This enabled direct comparison to be made with published results obtained at different temperatures, and it was found that those obtained in this work were highly comparable with others found for amine-impregnated porous materials with similar amine loadings.
L.M Marques; P.J.M. Carrott; Manuela Ribeiro Carrott. Amine-Modified Carbon Aerogels for CO2 Capture. Adsorption Science & Technology 2013, 31, 223 -232.
AMA StyleL.M Marques, P.J.M. Carrott, Manuela Ribeiro Carrott. Amine-Modified Carbon Aerogels for CO2 Capture. Adsorption Science & Technology. 2013; 31 (2-3):223-232.
Chicago/Turabian StyleL.M Marques; P.J.M. Carrott; Manuela Ribeiro Carrott. 2013. "Amine-Modified Carbon Aerogels for CO2 Capture." Adsorption Science & Technology 31, no. 2-3: 223-232.
In the work now reported the production of activated carbons from a novel precursor, esparto grass, by activation with carbon dioxide is presented. The results show that the materials produced have interesting properties, namely BET apparent surface area and pore volume up to 1122 m2 g−1 and 0.46 cm3 g−1, respectively. The activated carbons have basic characteristics with point of zero charge between 9.25 and 10.27 and show a very fascinating structure, as shown by the SEM images
Joao Manuel Valente Nabais; C. Laginhas; Manuela Ribeiro Carrott; P.J.M. Carrott; José Enrique Crespo Amorós; A.V. Nadal Gisbert. Surface and porous characterisation of activated carbons made from a novel biomass precursor, the esparto grass. Applied Surface Science 2013, 265, 919 -924.
AMA StyleJoao Manuel Valente Nabais, C. Laginhas, Manuela Ribeiro Carrott, P.J.M. Carrott, José Enrique Crespo Amorós, A.V. Nadal Gisbert. Surface and porous characterisation of activated carbons made from a novel biomass precursor, the esparto grass. Applied Surface Science. 2013; 265 ():919-924.
Chicago/Turabian StyleJoao Manuel Valente Nabais; C. Laginhas; Manuela Ribeiro Carrott; P.J.M. Carrott; José Enrique Crespo Amorós; A.V. Nadal Gisbert. 2013. "Surface and porous characterisation of activated carbons made from a novel biomass precursor, the esparto grass." Applied Surface Science 265, no. : 919-924.
DHBARF polymer aerogels were prepared from mixtures containing a fixed stoichiometric amount of formaldehyde (F) and varying proportions of resorcinol (R) and 2,4-dihydroxybenzoic acid (DHBA), with the objective of combining the advantages of high mesopore volume and solids content of RF aerogels with the ion exchange capacity of DHBAF aerogels. The results show that surface area, pore volume, pore size and ion exchange capacity vary in a systematic fashion as the composition of the synthesis mixture is altered. It was found that up to a DHBA mole fraction of about 0.5 preferential phase separation of RF occurred and lead to the formation of primary particles consisting of an RF core and a rough DHBAF shell. When DHBAF and DHBARF aerogels were prepared using the same %DHBA, it was found that the addition of R to the synthesis mixture resulted in increased values of surface area, mesopore volume and mean diameter while simultaneously maintaining the ion exchange capacity of the wet gel. The optimum compromise was found for a DHBARF aerogel with core-shell structure prepared using 5% DHBA and 5% R. Under these conditions the ion exchange capacity was at its maximum value of slightly higher than 2 meq g 1, the surface area was 850 m2 g 1, the mesopore volume was 2 cm3 g 1 and the mesopore mean diameter was 17 nm
P.J.M. Carrott; L.M Marques; Manuela Ribeiro Carrott. Core-shell polymer aerogels prepared by co-polymerisation of 2,4-dihydroxybenzoic acid, resorcinol and formaldehyde. Microporous and Mesoporous Materials 2012, 158, 170 -174.
AMA StyleP.J.M. Carrott, L.M Marques, Manuela Ribeiro Carrott. Core-shell polymer aerogels prepared by co-polymerisation of 2,4-dihydroxybenzoic acid, resorcinol and formaldehyde. Microporous and Mesoporous Materials. 2012; 158 ():170-174.
Chicago/Turabian StyleP.J.M. Carrott; L.M Marques; Manuela Ribeiro Carrott. 2012. "Core-shell polymer aerogels prepared by co-polymerisation of 2,4-dihydroxybenzoic acid, resorcinol and formaldehyde." Microporous and Mesoporous Materials 158, no. : 170-174.
In this work, we compare experimental results to molecular simulation results of volatile organic compound (VOC) adsorption on nonporous silica. We adopted an effective model for the rough solid surface, obtained by a temperature annealing scheme, plus an experimental/simulation nitrogen adsorption tuning process over the silica energetic oxygen parameter. The measurement/prediction of selected VOCs, specifically, n-pentane and methylcyclohexane, is presented in terms of adsorption isotherms, with an emphasis on the angle distribution analysis of the three studied probe molecules with respect to the same modeled surface.
Carmelo Herdes; M. Manuela L. Ribeiro Carrott; Patrícia A. Russo; Peter J. M. Carrott. Volatile Organic Compound Adsorption on a Nonporous Silica Surface: How Do Different Probe Molecules Sense the Same Surface? Langmuir 2011, 27, 14940 -14946.
AMA StyleCarmelo Herdes, M. Manuela L. Ribeiro Carrott, Patrícia A. Russo, Peter J. M. Carrott. Volatile Organic Compound Adsorption on a Nonporous Silica Surface: How Do Different Probe Molecules Sense the Same Surface? Langmuir. 2011; 27 (24):14940-14946.
Chicago/Turabian StyleCarmelo Herdes; M. Manuela L. Ribeiro Carrott; Patrícia A. Russo; Peter J. M. Carrott. 2011. "Volatile Organic Compound Adsorption on a Nonporous Silica Surface: How Do Different Probe Molecules Sense the Same Surface?" Langmuir 27, no. 24: 14940-14946.
The aim of this research was to investigate how post treatment modification, such as those with sodium hydroxide or urea, can influence the capacity of activated carbon (AC) for phenolic compounds removal from liquid media. The ACs modification was performed using urea impregnation followed by pyrolysis at high temperature. With all ACs used, this treatment induced a pore volume increase, a mean pore size broadening, an increase in the point of zero charge and also in the basic character. The modification with sodium hydroxide brings to light the influence of the precursor nature as the achievements are really diverse. With the ACs obtained from PET, a pore volume and mean pore size reduction occurred, with the AC-cloth no textural effect was observed and with the AC obtained from cork, an enlargement of the mean pore size and an increase of the pore volume were confirmed. The difference in the acidic/basic character exhibited by the modified ACs was in agreement with the presence of acidic/basic superficial groups identified by FTIR. The textural and chemical properties of the ACs affect in a direct way the phenolic compounds removal capacity. Particularly, those modified with urea, which exhibited a superior removal capacity for both phenolic compounds.
I.P.P. Cansado; P.A.M. Mourão; A.I. Falcão; M.M.L. Ribeiro Carrott; P.J.M. Carrott. The influence of the activated carbon post-treatment on the phenolic compounds removal. Fuel Processing Technology 2011, 103, 64 -70.
AMA StyleI.P.P. Cansado, P.A.M. Mourão, A.I. Falcão, M.M.L. Ribeiro Carrott, P.J.M. Carrott. The influence of the activated carbon post-treatment on the phenolic compounds removal. Fuel Processing Technology. 2011; 103 ():64-70.
Chicago/Turabian StyleI.P.P. Cansado; P.A.M. Mourão; A.I. Falcão; M.M.L. Ribeiro Carrott; P.J.M. Carrott. 2011. "The influence of the activated carbon post-treatment on the phenolic compounds removal." Fuel Processing Technology 103, no. : 64-70.
The adsorption–desorption of toluene, methylcyclohexane, neopentane and n-pentane was measured at temperatures between 258 and 308 K on mesoporous silica materials with different pore structures and pore sizes (MCM-41, SBA-15, SBA-16, LPC and MCF). It was found that the change in the width of the hysteresis cycles with temperature is similar for MCM-41, SBA-15 and MCF but distinct for the materials having pores accessible through very narrow openings (SBA-16 and LPC). A comparison between the plots of Vads vs. potential for SBA-16, LPC and MCF suggested that the differences are a consequence of the non equilibrium evaporation mechanism of the organics from the pores of SBA-16 and LPC. The isosteric enthalpies of adsorption indicated that the strength of the gas–solid interactions for toluene is superior to those corresponding to neopentane, methylcyclohexane or n-pentane. The isosteric enthalpies associated with capillary condensation are higher than the molar condensation enthalpies for the materials with narrower mesopores. As the size of the pores increases, the difference gradually decreases and the isosteric enthalpies are identical to the molar condensation enthalpies for the materials with pores larger than ∼20 nm. The apparent evaporation enthalpies were found to be higher than the apparent condensation enthalpies when the hydrocarbons isotherms exhibited developed hysteresis, except in the case of the MCF silica, for which the values of both enthalpies were similar.
P.A. Russo; M.M.L. Ribeiro Carrott; P.J.M. Carrott. Trends in the condensation/evaporation and adsorption enthalpies of volatile organic compounds on mesoporous silica materials. Microporous and Mesoporous Materials 2011, 151, 223 -230.
AMA StyleP.A. Russo, M.M.L. Ribeiro Carrott, P.J.M. Carrott. Trends in the condensation/evaporation and adsorption enthalpies of volatile organic compounds on mesoporous silica materials. Microporous and Mesoporous Materials. 2011; 151 ():223-230.
Chicago/Turabian StyleP.A. Russo; M.M.L. Ribeiro Carrott; P.J.M. Carrott. 2011. "Trends in the condensation/evaporation and adsorption enthalpies of volatile organic compounds on mesoporous silica materials." Microporous and Mesoporous Materials 151, no. : 223-230.
Microporous activated carbons prepared by KOH chemical activation or steam activation from lignite were characterised by adsorption of N2 at 77 K and CO2 at 298 K. Subsequently, the adsorption of ethanol was carried out and complemented by adsorption of benzene and cyclohexane. The isotherm analysis included application of the αs method using ethanol reference data obtained here by also studying non-porous carbon blacks. The work confirmed that ethanol is an experimentally convenient adsorptive to use and leads to results in overall agreement with those obtained using other probe molecules. Of particular interest was the observation that ethanol can gain access to the whole microporosity even in the case of samples containing constricted micropore entrances. It was also possible to show that certain furnace carbon blacks contain intrinsic microporosity which is more difficult to unambiguously detect by adsorption of N2 at 77 K. On the other hand, the results also suggested that the exact shape of the ethanol adsorption isotherm on a non-porous surface is more sensitive to the nature of the surface than has previously been found with other adsorptives.
P.J.M. Carrott; Isabel Pestana Da Paixão Cansado; Paulo Mourão; Manuela Ribeiro Carrott; N.D.B. Louro; A. Albiniak; E. Broniek; M. Jasieńko-Hałat. On the use of ethanol for evaluating microporosity of activated carbons prepared from Polish lignite. Fuel Processing Technology 2011, 103, 34 -38.
AMA StyleP.J.M. Carrott, Isabel Pestana Da Paixão Cansado, Paulo Mourão, Manuela Ribeiro Carrott, N.D.B. Louro, A. Albiniak, E. Broniek, M. Jasieńko-Hałat. On the use of ethanol for evaluating microporosity of activated carbons prepared from Polish lignite. Fuel Processing Technology. 2011; 103 ():34-38.
Chicago/Turabian StyleP.J.M. Carrott; Isabel Pestana Da Paixão Cansado; Paulo Mourão; Manuela Ribeiro Carrott; N.D.B. Louro; A. Albiniak; E. Broniek; M. Jasieńko-Hałat. 2011. "On the use of ethanol for evaluating microporosity of activated carbons prepared from Polish lignite." Fuel Processing Technology 103, no. : 34-38.
Adsorption of bovine serum albumin (BSA) at pH 5 and lysozyme (LYS) at pH 8 on MCF silica functionalised with chloromethyl (CM), mercaptopropyl (MP), octyl (Oc) or aminopropyl (AP) groups was investigated and compared with that on the unmodified silica material. The results show that the adsorption performance of the solid (adsorption capacity and adsorption rates) can be tailored by incorporating a specific type and amount of functionality and, therefore, the material can be designed for a particular application. The material with 1.22 mmol g−1 of AP exhibits the highest adsorption capacity for BSA (711 mg g−1) but the smaller LYS molecules are almost completely excluded from the cells. Both proteins have more affinity for the solids containing relatively small amounts of CM and MP than for the silica, with the effect being more pronounced for LYS. On the contrary, the hydrophobicity and steric hindrance imparted to the surface by octyl or high amounts of CM groups causes significant reduction of the total amounts of LYS and BSA adsorbed. The adsorption rates of the proteins were found to be strongly dependent on the size and amount of the organic groups, especially for the large BSA. Incorporation of bulky (octyl) or high amounts of functional groups caused significant decrease of the adsorption rates. However, if protein–solid interactions are favorable and steric hindrance is relatively low, the adsorption rate can be considerably increased, as found for LYS on MCF materials with 1.26 and 2.29 mmol g−1 of CM or 0.86 and 1.11 mmol g−1 of MP.
Patrícia Russo; M.M.L. Ribeiro Carrott; Paulo Mourão; P.J.M. Carrott. Tailoring the surface chemistry of mesocellular foams for protein adsorption. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2011, 386, 25 -35.
AMA StylePatrícia Russo, M.M.L. Ribeiro Carrott, Paulo Mourão, P.J.M. Carrott. Tailoring the surface chemistry of mesocellular foams for protein adsorption. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2011; 386 (1-3):25-35.
Chicago/Turabian StylePatrícia Russo; M.M.L. Ribeiro Carrott; Paulo Mourão; P.J.M. Carrott. 2011. "Tailoring the surface chemistry of mesocellular foams for protein adsorption." Colloids and Surfaces A: Physicochemical and Engineering Aspects 386, no. 1-3: 25-35.
Using triblock copolymer Pluronic P123 as a structure-directing agent, water as solvent, tetraethyl orthosilicate (TEOS) and aluminium sulfate (Al2(SO4)3 18H2O) as silica and aluminium sources, respectively, a series of Al-SBA-15 with well-ordered mesostructure has been hydrothermally synthesized up to high aging temperature through a one-step approach in an environmentally friendly mineral acid-free medium. The influence of some synthesis parameters such as Si/Al molar ratio (5–100), P123/Si molar ratio (0.0025–0.014) and aging temperature (363–443 K) on the properties of the resultant materials were investigated by powder X-ray diffraction (XRD), nitrogen adsorption–desorption at 77 K, transmission electron microscopy (TEM), and solid state 27Al MAS NMR analyses. The textural properties of Al-SBA-15, such as specific surface area, pore volume and mesopore size, can be modified by simply adjusting those synthesis parameters. Solid state 27Al MAS NMR results show direct evidence that aluminium is introduced onto the wall structure and located mainly at tetrahedrally coordinated sites. The structural ordering increases with increasing aluminium sulfate amount in the gel from Si/Al of 100–5, with the aluminium species playing an important role in the formation of the ordered mesostructure. The increase of aging temperature causes widening of mesopores, which are still highly ordered upon aging at 443 K. The procedure allows the formation, up to high reaction temperature, of aluminium incorporated SBA-15 exhibiting high structural ordering and hydrothermal stability.
S. Lin; L. Shi; M.M.L. Ribeiro Carrott; P.J.M. Carrott; J. Rocha; M.R. Li; X.D. Zou. Direct synthesis without addition of acid of Al-SBA-15 with controllable porosity and high hydrothermal stability. Microporous and Mesoporous Materials 2011, 142, 526 -534.
AMA StyleS. Lin, L. Shi, M.M.L. Ribeiro Carrott, P.J.M. Carrott, J. Rocha, M.R. Li, X.D. Zou. Direct synthesis without addition of acid of Al-SBA-15 with controllable porosity and high hydrothermal stability. Microporous and Mesoporous Materials. 2011; 142 (2-3):526-534.
Chicago/Turabian StyleS. Lin; L. Shi; M.M.L. Ribeiro Carrott; P.J.M. Carrott; J. Rocha; M.R. Li; X.D. Zou. 2011. "Direct synthesis without addition of acid of Al-SBA-15 with controllable porosity and high hydrothermal stability." Microporous and Mesoporous Materials 142, no. 2-3: 526-534.
This contribution compares experimental nitrogen adsorption isotherms with molecular simulation results on effective non-porous silica models. A Molecular Dynamic (MD) annealing temperature scheme was adopted for the formulation of three samples of the solid surface. By means of Grand Canonical Monte Carlo (GCMC) simulations, nitrogen adsorption isotherms were obtained for each sample, with charged and uncharged nitrogen molecules, and compared with relevant experimental data. Following comparison of the experimental and simulated nitrogen results, a tuning process over the energetic parameter of the oxygen atoms was performed for the final proposed model. Specifically, the results are presented in terms of adsorption isotherms with an emphasis on the annealing effect over relevant model parameters, such as the surface concentration and the distribution of non-bridging oxygen atoms.
Carmelo Herdes; Patrícia Russo; Manuela Ribeiro Carrott; Peter J.M. Carrott. Nitrogen Adsorption Studies on Non-Porous Silica: The Annealing Effect over Surface Non-Bridging Oxygen Atoms. Adsorption Science & Technology 2011, 29, 357 -364.
AMA StyleCarmelo Herdes, Patrícia Russo, Manuela Ribeiro Carrott, Peter J.M. Carrott. Nitrogen Adsorption Studies on Non-Porous Silica: The Annealing Effect over Surface Non-Bridging Oxygen Atoms. Adsorption Science & Technology. 2011; 29 (4):357-364.
Chicago/Turabian StyleCarmelo Herdes; Patrícia Russo; Manuela Ribeiro Carrott; Peter J.M. Carrott. 2011. "Nitrogen Adsorption Studies on Non-Porous Silica: The Annealing Effect over Surface Non-Bridging Oxygen Atoms." Adsorption Science & Technology 29, no. 4: 357-364.
Different chemical reagents (phosphoric acid, boric acid, ammonium citrate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate and trisodium phosphate) were employed to develop activated carbon cloths (ACC) by chemical activation of a lyocell precursor, in an attempt to explore their effect on main physico-chemical characteristics and electrical behaviour of the resulting ACC. The activating agent markedly influenced yield, elemental composition, and textural properties of the ACC. The ACC obtained with phosphoric and boric acids were essentially microporous, whereas those developed with the other reagents presented mesoporosity development. Phosphoric acid-derived samples showed the highest specific surface area (976 m2/g). The results also highlight the relevance of correcting the external surface adsorption in order to obtain reliable estimates of micropore volume. All the ACC were electrically conductive, their resistivity being also strongly dependent on the nature of the activating agent. The electrical resistivity of the ACC obtained with all the phosphorous compounds was successfully correlated with their C/H ratio and micropore volume.
M.E. Ramos; P.R. Bonelli; S. Blacher; Manuela Ribeiro Carrott; P.J.M. Carrott; A.L. Cukierman. Effect of the activating agent on physico-chemical and electrical properties of activated carbon cloths developed from a novel cellulosic precursor. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2011, 378, 87 -93.
AMA StyleM.E. Ramos, P.R. Bonelli, S. Blacher, Manuela Ribeiro Carrott, P.J.M. Carrott, A.L. Cukierman. Effect of the activating agent on physico-chemical and electrical properties of activated carbon cloths developed from a novel cellulosic precursor. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2011; 378 (1-3):87-93.
Chicago/Turabian StyleM.E. Ramos; P.R. Bonelli; S. Blacher; Manuela Ribeiro Carrott; P.J.M. Carrott; A.L. Cukierman. 2011. "Effect of the activating agent on physico-chemical and electrical properties of activated carbon cloths developed from a novel cellulosic precursor." Colloids and Surfaces A: Physicochemical and Engineering Aspects 378, no. 1-3: 87-93.
The production of activated carbons from almond shell, using physical activation by CO2 is reported in this work. The used method has produced activated carbons with apparent BET surface areas and micropore volume as high as 1138 m2 g−1 and 0.49 cm3 g−1, respectively. The activated carbons produced have essentially primary micropores and only a small volume of wider micropores. By FTIR analysis it was possible to identify, in the surface of the activated carbons, several functional groups, namely hydroxyls (free and phenol), ethers, esters, lactones, pyrones and Si–H bonds. By the analysis of the XRD patterns it was possible to calculate the microcrystallites dimensions with height between 1.178 and 1.881 nm and width between 3.106 and 5.917 nm. From the XRD it was also possible to identify the presence of traces of inorganic heteroatoms such as Si, Pb, K, Fe and P. All activated carbons showed basic characteristics with point of zero charge between 9.42 and 10.43.
João M. Valente Nabais; Carlos Eduardo C. Laginhas; P.J.M. Carrott; Manuela Ribeiro Carrott. Production of activated carbons from almond shell. Fuel Processing Technology 2011, 92, 234 -240.
AMA StyleJoão M. Valente Nabais, Carlos Eduardo C. Laginhas, P.J.M. Carrott, Manuela Ribeiro Carrott. Production of activated carbons from almond shell. Fuel Processing Technology. 2011; 92 (2):234-240.
Chicago/Turabian StyleJoão M. Valente Nabais; Carlos Eduardo C. Laginhas; P.J.M. Carrott; Manuela Ribeiro Carrott. 2011. "Production of activated carbons from almond shell." Fuel Processing Technology 92, no. 2: 234-240.