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Söderlind, Fredrik
Publications (10 of 41) Show all publications
Atakan, A., Mäkie, P., Söderlind, F., Keraudy, J., Johansson, E. & Odén, M. (2017). Synthesis of a Cu-infiltrated Zr-doped SBA-15 catalyst for CO2 hydrogenation into methanol and dimethyl ethert. Physical Chemistry, Chemical Physics - PCCP, 19(29), 19139-19149
Open this publication in new window or tab >>Synthesis of a Cu-infiltrated Zr-doped SBA-15 catalyst for CO2 hydrogenation into methanol and dimethyl ethert
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2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 29, p. 19139-19149Article in journal (Refereed) Published
Abstract [en]

A catalytically active nanoassembly comprising Cu-nanoparticles grown on integrated and active supports (large pore Zr-doped mesoporous SBA-15 silica) has been synthesized and used to promote CO2 hydrogenation. The doped mesoporous material was synthesized using a sal-gel method, in which the pore size was tuned between 11 and 15 nm while maintaining a specific surface area of about 700 m(2) g (1). The subsequent Cu nanoparticle growth was achieved by an infiltration process involving attachment of different functional groups on the external and internal surfaces of the mesoporous structure such that 7-10 nm sized Cu nanoparticles grew preferentially inside the pores. Chemisorption showed improved absorption of both CO2 and H-2 for the assembly compared to pure SBA-15 and 15% of the total CO2 was converted to methanol and dimethyl ether at 250 degrees C and 33 bar.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2017
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-139804 (URN)10.1039/c7cp03037a (DOI)000406334300033 ()28702581 (PubMedID)
Note

Funding Agencies|EUs Erasmus-Mundus program; Swedish Research Council; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [SFO-Mat-LiU 11 2009-00971]; Knut och Alice Wallenbergs Foundation [KAW 2012.0083]

Available from: 2017-08-17 Created: 2017-08-17 Last updated: 2018-04-16
Björk, E. M., Söderlind, F. & Odén, M. (2014). Single-pot synthesis of ordered mesoporous silica films with unique controllable morphology. Journal of Colloid and Interface Science, 413, 1-7
Open this publication in new window or tab >>Single-pot synthesis of ordered mesoporous silica films with unique controllable morphology
2014 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 413, p. 1-7Article in journal (Refereed) Published
Abstract [en]

Mesoporous silica films consisting of a monolayer of separated SBA-15 particles with unusually wide and short pores grown on silicon wafers have been fabricated in a simple single-pot-synthesis, and the formation of the films has been studied. A recipe for synthesizing mesoporous silica rods with the addition of heptane and NH4F at low temperature was used and substrates were added to the synthesis solution during the reaction. The films are ∼90 nm thick, have a pore size of 10.7–13.9 nm depending on the hydrothermal treatment time and temperature, and a pore length of 200–400 nm. All pores are parallel to the substrate, open, and easy to access, making them suitable for applications such as catalyst hosts and gas separation. The growth of the films is closely correlated to the evolution of the mesoporous silica particles. Here, we have studied the time for adding substrates to the synthesis solution, the evolution of the films with time during formation, and the effect of hydrothermal treatment. It was found that the substrates should be added within 30–60 s after turning off the stirring and the films are formed within 10 min after addition to the synthesis solution. The study has yielded a new route for synthesizing mesoporous silica films with a unique morphology.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
SBA-15; Mesoporous silica; Large pore; Films; Rods; Film growth; Particle formation
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-99856 (URN)10.1016/j.jcis.2013.09.023 (DOI)000327168800001 ()
Available from: 2013-10-22 Created: 2013-10-22 Last updated: 2017-12-06Bibliographically approved
Selegård, L., Ahrén, M., Brommesson, C., Söderlind, F., Persson, P. O. O. & Uvdal, K. (2013). Bifunctional gadolinium decorated ZnO nanocrystals integrating both enhanced MR signal and bright fluorescence.
Open this publication in new window or tab >>Bifunctional gadolinium decorated ZnO nanocrystals integrating both enhanced MR signal and bright fluorescence
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2013 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Gadolinium decorated ZnO nanoparticles simultaneously possess both fluorescent and MR enhancement properties. These ZnO nanoparticles are crystalline and shielded by an amorphous gadolinium acetate matrix. Interestingly, the Gd-acetate decoration enhances the fluorescence emission of the ZnO nanoparticles. The quantum yield does increase for samples with high Gd/Zn relative ratios and these samples do also show a higher colloidal stability.

In addition, these nanoparticles show an enhanced relaxivity value per Gd atom (r119.9mM1s-1) compared to results earlier reported both on Gd alloyed ZnO nanoparticles and pure Gd2O3 nanoparticles. This improvement is considered to be due to the close proximity of Gd atoms and surrounding water molecules. A comprehensive study of the quantum yield and the relaxivity, as a function of composition, enable us to identify the ultimate design/composition of gadolinium decorated ZnO nanoparticles for optimum fluorescence and MR enhancement properties.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-91847 (URN)
Available from: 2013-05-03 Created: 2013-05-03 Last updated: 2015-05-29Bibliographically approved
Björk, E. M., Söderlind, F. & Odén, M. (2013). Grafting mesoporous silica particles to substrates: a method for synthesizing mesoporous films with cylindrical pores perpendicular to the substrate.
Open this publication in new window or tab >>Grafting mesoporous silica particles to substrates: a method for synthesizing mesoporous films with cylindrical pores perpendicular to the substrate
2013 (English)Manuscript (preprint) (Other academic)
Abstract [en]

A method for synthesizing mesoporous silica films with cylindrical pores perpendicular to the substrate has been developed. The films consist of SBA-15 platelets that are grafted on glass substrates. The grafting is studied in terms of parameters such as pH, substrate functionalization, salt additions, time for TEOS prehydrolysis, and calcination. The best coverage of particles on the substrate was achieved for a low pH in combination with OTS-treated glass substrate. Furthermore, the prehydrolysis time of the TEOS was found to be a key parameter in order to bind the particles to the substrate. These porous films have potential in applications such as catalysis, drug delivery, and as a template for nanoparticle or nanorod, growth.

Keywords
Mesoporous silica films, platelets, particle functionalization, substrate functionalization, pH, salt
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-99857 (URN)
Available from: 2013-10-22 Created: 2013-10-22 Last updated: 2013-10-22Bibliographically approved
Ballem, M. A., Söderlind, F., Nordblad, P., Käll, P.-O. & Odén, M. (2013). Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks. Microporous and Mesoporous Materials, 168, 221-224
Open this publication in new window or tab >>Growth of Gd2O3 nanoparticles inside mesoporous silica frameworks
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2013 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 168, p. 221-224Article in journal (Refereed) Published
Abstract [en]

Gadolinium oxide (Gd2O3) nanoparticles with very small size, and narrow size distribution were synthesized by infiltration of Gd(NO3)3.6H2O as an oxide precursor into the pores of SBA-15 mesoporous silica using a wet-impregnation technique. High resolution transmission electron microscopy and X-ray diffraction show that during the hydrothermal treatment of the precursor at 550 °C, gadolinium oxide nanoparticles inside the silica pores are formed. Subsequent dissolution of the silica template by NaOH resulted in well dispersed nanoparticles with an average diameter of 3.6 ± 0.9 nm.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
Gd2O3; Nanoparticles; Nanocasting; Mesoporous silica; SBA-15
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-67918 (URN)10.1016/j.micromeso.2012.10.009 (DOI)000313839800030 ()
Note

At the time of the defence, this publication was an unsubmitted manuscript

Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2017-12-11Bibliographically approved
Hu, Z., Ahrén, M., Selegård, L., Skoglund, C., Söderlind, F., Engström, M., . . . Uvdal, K. (2013). Highly Water-Dispersible Surface-Modified Gd2O3 Nanoparticles for Potential Dual-Modal Bioimaging. Chemistry - A European Journal, 19(38), 12658-12667
Open this publication in new window or tab >>Highly Water-Dispersible Surface-Modified Gd2O3 Nanoparticles for Potential Dual-Modal Bioimaging
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2013 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 19, no 38, p. 12658-12667Article in journal (Refereed) Published
Abstract [en]

Water-dispersible and luminescent gadolinium oxide (GO) nanoparticles (NPs) were designed and synthesized for potential dual-modal biological imaging. They were obtained by capping gadolinium oxide nanoparticles with a fluorescent glycol-based conjugated carboxylate (HL). The obtained nanoparticles (GO-L) show long-term colloidal stability and intense blue fluorescence. In addition, L can sensitize the luminescence of europium(III) through the so-called antenna effect. Thus, to extend the spectral ranges of emission, europium was introduced into L-modified gadolinium oxide nanoparticles. The obtained Eu-III-doped particles (Eu:GO-L) can provide visible red emission, which is more intensive than that without L capping. The average diameter of the monodisperse modified oxide cores is about 4nm. The average hydrodynamic diameter of the L-modified nanoparticles was estimated to be about 13nm. The nanoparticles show effective longitudinal water proton relaxivity. The relaxivity values obtained for GO-L and Eu:GO-L were r(1)=6.4 and 6.3s(-1)mM(-1) with r(2)/r(1) ratios close to unity at 1.4T. Longitudinal proton relaxivities of these nanoparticles are higher than those of positive contrast agents based on gadolinium complexes such as Gd-DOTA, which are commonly used for clinical magnetic resonance imaging. Moreover, these particles are suitable for cellular imaging and show good biocompatibility.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-98690 (URN)10.1002/chem.201301687 (DOI)000324316300018 ()
Available from: 2013-10-11 Created: 2013-10-11 Last updated: 2017-12-06Bibliographically approved
Khan, Y., Tajammul Hussain, S., Abbasi, M. A., Käll, P.-O. & Söderlind, F. (2013). On the decoration of 3D nickel foam with single crystal ZnO nanorod arrays and their cathodoluminescence study. Materials letters (General ed.), 90, 126-130
Open this publication in new window or tab >>On the decoration of 3D nickel foam with single crystal ZnO nanorod arrays and their cathodoluminescence study
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2013 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 90, p. 126-130Article in journal (Refereed) Published
Abstract [en]

Starting with an ammonical solution of zinc acetate, dense single crystal ZnO nanorod arrays were grown directly on high surface area porous 3D nickel foam substrates using a low temperature hydrothermal route. Heterogeneous nucleation of the nanorods with diameters around 100 nm can be conveniently and reproducibly Controlled by adjusting the amount of ammonia added to the growth solution. X-ray diffraction and HRTEM analysis confirmed the single phase wurtzite structure and c-axis orientation of the as grown ZnO nanorod arrays. Cathodoluminescence measurements indicate that the as-grown nanorod arrays were rich in atomic defects and gave strong orange emissions in the visible region. The nanorod arrays on unique 3D substrate are expected to improve the sensitivity and efficiency of ZnO based electrochemical sensors and heterogeneous catalysts.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
ZnO, Nanostructures, Porous materials, Cathodoluminescence
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-86622 (URN)10.1016/j.matlet.2012.09.033 (DOI)000311260700032 ()
Available from: 2012-12-20 Created: 2012-12-20 Last updated: 2017-12-06
Ahrén, M., Söderlind, F., Linares, M., Nordblad, P., Norman, P. & Uvdal, K. (2013). One-step synthesis of sub 5 nm sized manganese oxide based nanoparticles.
Open this publication in new window or tab >>One-step synthesis of sub 5 nm sized manganese oxide based nanoparticles
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2013 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Sub 5 nm sized manganese oxide nanoparticles; MnOx (1 ≤ x ≤ 2), were synthesized via a short time room temperature synthesis route. The nanoparticles are crystalline, spherically shaped and in the size range of 2-4 nm as shown by transmission electron microscopy studies. Selected area electron diffraction patterns were collected and their appearance indicated that the nanoparticle cores are composed of MnO. Also, co-existence of the (II) and (III) oxidation states at the nanoparticle surface was verified by results achieved from infrared spectroscopy and X-ray photoelectron spectroscopy. These measurements also supported presence of a minor amount of acetate groups as well as a negligible fraction of carbonate groups at the nanoparticle surfaces. The interpretation of the IR spectra was confirmed by quantum chemical calculations using the high spin manganese nanoparticle Mn12O12(OAc)16(H2O)4, as a model system for the MnOx nanoparticle surface. Bulk MnO and Mn2O3 are known to be antiferromagnetic. The magnetic properties are however somewhat dependent of the crystallite size and changes when scaling down to the nanoregion. The MnOx (1 ≤ x ≤ 2) nanoparticles investigated in this work show a superparamagnetic behavior with a blocking temperature of approximately 12 K proven by means of SQUID measurements. The relaxivities of the nanoparticles and the Mn(OAc)2 precursors were studied with a bench top NMR analyzer verifying nanoparticle r1 and r2 of 0.5 and 6 mMs-1 respectively. The r1 relaxivity is lower than what is earlier reported for Gd based contrast agent, but improvements are expected by further surface modification, due to increased rotational time and higher water dispersability.

National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-98692 (URN)
Available from: 2013-10-11 Created: 2013-10-11 Last updated: 2018-10-08Bibliographically approved
Björk, E. M., Söderlind, F. & Odén, M. (2013). Tuning the shape of mesoporous silica particles by alterations in parameter space: from rods to platelets. Langmuir, 29(44), 13551-13561
Open this publication in new window or tab >>Tuning the shape of mesoporous silica particles by alterations in parameter space: from rods to platelets
2013 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 29, no 44, p. 13551-13561Article in journal (Refereed) Published
Abstract [en]

The knowledge of how to control the pore size and morphology of separated mesoporous silica particles is crucial for optimizing their performance in applications, such as molecular sieves and drug delivery systems. In this work, we have systematically studied the effects of various synthesis parameters to gain a deeper understanding of how particle morphologies can be altered. It was found that the morphology for isolated particles of SBA-15 type, with unusually short and wide pores, could be altered from rods to platelets by variations in the NH4F concentration. The pore length is nearly constant (similar to 300 nm) for the different morphologies, but the particle width is increasing from 200 nm to >3 mu m when decreasing the amount of NH4F, and the pore size can be tuned between 10 and 13 nm. Furthermore, other synthesis parameters such as heptane concentration, pH, silica precursor, and additions of ions have also been studied. The trend regarding particle width is independent of heptane concentration, at the same time as heptane increases the particle length up to a plateau value of similar to 500 nm. In all, parameters controlling particle width, length, and pore size have been separated in order to evaluate their function in the particle formation. Additionally, it was found that the formation time of the particles is strongly affected by the fluoride ion concentration, and a mechanism for particle formation for this system, where micelles transform from a foam, to multilamellar vesicles, and finally to cylindrical micelles, is suggested.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2013
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-99859 (URN)10.1021/la403201v (DOI)000326711200029 ()
Available from: 2013-10-22 Created: 2013-10-22 Last updated: 2017-12-06Bibliographically approved
Ahrén, M., Selegård, L., Söderlind, F., Linares, M., Kauczor, J., Norman, P., . . . Uvdal, K. (2012). A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study. Journal of nanoparticle research, 14(8)
Open this publication in new window or tab >>A simple polyol-free synthesis route to Gd2O3 nanoparticles for MRI applications: an experimental and theoretical study
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2012 (English)In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 14, no 8Article in journal (Refereed) Published
Abstract [en]

Chelated gadolinium ions, e. g., GdDTPA, are today used clinically as contrast agents for magnetic resonance imaging (MRI). An attractive alternative contrast agent is composed of gadolinium oxide nanoparticles as they have shown to provide enhanced contrast and, in principle, more straightforward molecular capping possibilities. In this study, we report a new, simple, and polyol-free way of synthesizing 4-5-nm-sized Gd2O3 nanoparticles at room temperature, with high stability and water solubility. The nanoparticles induce high-proton relaxivity compared to Gd-DTPA showing r(1) and r(2) values almost as high as those for free Gd3+ ions in water. The Gd2O3 nanoparticles are capped with acetate and carbonate groups, as shown with infrared spectroscopy, near-edge X-ray absorption spectroscopy, X-ray photoelectron spectroscopy and combined thermogravimetric and mass spectroscopy analysis. Interpretation of infrared spectroscopy data is corroborated by extensive quantum chemical calculations. This nanomaterial is easily prepared and has promising properties to function as a core in a future contrast agent for MRI.

Place, publisher, year, edition, pages
Springer Verlag (Germany), 2012
Keywords
Gadolinium oxide, Synthesis, Relaxivity, XPS, IR, Toxicity
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-81505 (URN)10.1007/s11051-012-1006-2 (DOI)000307273400028 ()
Note

Funding Agencies|VINNOVA|2008-03011|Centre in Nanoscience and Technology at LiTH (CeNano)||Swedish research council|621-2010-5014|SERC (Swedish e-Science Research Center)||

Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2017-12-07
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