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Boström, Mattias
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Publications (10 of 56) Show all publications
Boström, M., Persson, C., Parsons, D. F., Ellingsen, S. A. & Sernelius, B. (2013). Atmospheric water droplets can catalyse atom pair break-up via surface-induced resonance repulsion. Europhysics letters, 101(4)
Open this publication in new window or tab >>Atmospheric water droplets can catalyse atom pair break-up via surface-induced resonance repulsion
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2013 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 101, no 4Article in journal (Refereed) Published
Abstract [en]

We present the theory for a retarded resonance interaction between two identical atoms near a dielectric surface. In free space the resonance interaction between isotropically excited atom pairs is attractive at all atom-atom separations. We illustrate numerically how this interaction between oxygen, sulphur, hydrogen, or nitrogen atom pairs may turn repulsive near water droplets. The results provide evidence of a mechanism causing excited state atom pair breakage to occur in the atmosphere near water droplets.

Place, publisher, year, edition, pages
EDP Sciences, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-90764 (URN)10.1209/0295-5075/101/43002 (DOI)000315999100007 ()
Note

Funding Agencies|VR|C048510170529001|STEM|34138-1|Australian Research Council||NCI National Facility at the Australian National University||

Available from: 2013-04-12 Created: 2013-04-05 Last updated: 2017-12-06Bibliographically approved
Fahlgren, A., Yang, X., Ciani, C., Ryan, J. A., Kelly, N., Ko, F. C., . . . Boström, M. P. G. (2013). The effects of PTH, loading and surgical insult on cancellous bone at the bone-implant interface in the rabbit. Bone, 52(2), 718-724
Open this publication in new window or tab >>The effects of PTH, loading and surgical insult on cancellous bone at the bone-implant interface in the rabbit
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2013 (English)In: Bone, ISSN 8756-3282, E-ISSN 1873-2763, Vol. 52, no 2, p. 718-724Article in journal (Refereed) Published
Abstract [en]

Enhancing the quantity and quality of cancellous bone with anabolic pharmacologic agents may lead to more successful outcomes of non-cemented joint replacements. Using a novel rabbit model of cancellous bone loading, we examined two specific questions regarding bone formation at the bone-implant interface: (1) does the administration of intermittent PTH, a potent anabolic agent, and mechanical loading individually and combined enhance the pen-implant cancellous bone volume fraction; and, (2) does surgical trauma enhance the anabolic effect of PTH on pen-implant bone volume fraction. In this model, PTH enhanced pen-implant bone volume fraction by 30% in loaded bone, while mechanical loading alone increased bone volume fraction modestly (+10%). Combined mechanical loading and PTH treatment had no synergistic effect on any cancellous parameters. However, a strong combined effect was found in bone volume fraction with combined surgery and PTH treatment (+34%) compared to intact control limbs. Adaptive changes in the cancellous bone tissue included increased ultimate stress and enhanced remodeling activity. The number of proliferative osteoblasts increased as did their expression of pro-collagen 1 and PTH receptor 1, and the number of TRAP positive osteoclasts also increased. In summary, both loading and intermittent PTH treatment enhanced pen-implant bone volume, and surgery and PTH treatment had a strong combined effect This finding is of clinical importance since enhancing early osseointegration in the post-surgical period has numerous potential benefits.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
Cancellous bone, Bone adaptation, Implant, PTH, Loading, Surgery
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-88658 (URN)10.1016/j.bone.2012.05.005 (DOI)000313607700026 ()
Note

Funding Agencies|Orthopaedic Research and Education Foundation||National Institutes of Health|R01-AR056802R01-AG028664P30-AR046121|

Available from: 2013-02-14 Created: 2013-02-14 Last updated: 2017-12-06
Boström, M., Sernelius, B., Baldissera, G., Persson, C. & Ninham, B. W. (2012). Casimir-Lifshitz interaction between ZnO and SiO2 nanorods in bromobenzene turns repulsive at intermediate separations due to retardation effects. Physical Review A. Atomic, Molecular, and Optical Physics, 85(4), 044702
Open this publication in new window or tab >>Casimir-Lifshitz interaction between ZnO and SiO2 nanorods in bromobenzene turns repulsive at intermediate separations due to retardation effects
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2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 4, p. 044702-Article in journal (Refereed) Published
Abstract [en]

We consider the interaction between a ZnO nanorod and a SiO2 nanorod in bromobenzene. Using optical data for the interacting objects and ambient we calculate the force (from short-range attractive van der Waals force to intermediate-range repulsive Casimir-Lifshitz force to long-range entropically driven attraction). The nonretarded van der Waals interaction is attractive at all separations. We demonstrate a retardation-driven repulsion at intermediate separations. At short separations (in the nonretarded limit) and at large separations (in the classical limit) the interaction is attractive. These effects can be understood from an analysis of multiple crossings of the dielectric functions of the three media as functions of imaginary frequencies.

Place, publisher, year, edition, pages
American Physical Society, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-77096 (URN)10.1103/PhysRevA.85.044702 (DOI)000302602500012 ()
Note
Funding Agencies|European Science Foundation||VR|70529001|Available from: 2012-05-04 Created: 2012-05-04 Last updated: 2017-12-07
Boström, M. & Sernelius, B. (2012). Repulsive van der Waals forces due to hydrogen exposure on bilayer graphene. Physical Review A. Atomic, Molecular, and Optical Physics, 85(1), 012508
Open this publication in new window or tab >>Repulsive van der Waals forces due to hydrogen exposure on bilayer graphene
2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 1, p. 012508-Article in journal (Refereed) Published
Abstract [en]

We consider the effect of atomic hydrogen exposure to a system of two undoped sheets of graphene grown near a silica surface (the first adsorbed to the surface and the second freestanding near the surface). In the absence of atomic hydrogen, the van der Waals force between the sheets is attractive at all separations, causing the sheets to come closer together. However, with the addition of atomic hydrogen between the sheets, the long-range van der Waals interaction turns repulsive at a critical concentration. The underlying triple layer structure (SiO(2)-atomic hydrogen gas-air) gives rise to a long-range repulsion that at large-enough separations dominates over the more rapidly decaying attraction between the two-dimensional undoped graphene sheets (and between the outer graphene sheet and SiO(2)). This may be an avenue to tune the separation between two graphene sheets with the gas concentration. The doping of the graphene layers increases the attractive part of the interaction and hence reduces the net repulsive interaction.

Place, publisher, year, edition, pages
American Physical Society, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-74639 (URN)10.1103/PhysRevA.85.012508 (DOI)000298984700002 ()
Note
Funding Agencies|VR Contract|70529001|Available from: 2012-02-03 Created: 2012-02-03 Last updated: 2017-12-08
Boström, M., Sernelius, B., Brevik, I. & Ninham, B. W. (2012). Retardation turns the van der Waals attraction into a Casimir repulsion as close as 3 nm. Physical Review A. Atomic, Molecular, and Optical Physics, 85(1), 010701
Open this publication in new window or tab >>Retardation turns the van der Waals attraction into a Casimir repulsion as close as 3 nm
2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 1, p. 010701-Article in journal (Refereed) Published
Abstract [en]

Casimir forces between surfaces immersed in bromobenzene have recently been measured by Munday et al. [Nature (London) 454, 07610 (2009)]. Attractive Casimir forces were found between gold surfaces. The forces were repulsive between gold and silica surfaces. We show the repulsion is due to retardation effects. The van der Waals interaction is attractive at all separations. The retardation-driven repulsion sets in at around 3 nm. To our knowledge, retardation effects have never been found at such a small distance before. Retardation effects are usually associated with large distances.

Place, publisher, year, edition, pages
American Physical Society, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-74641 (URN)10.1103/PhysRevA.85.010701 (DOI)000298984400001 ()
Note
Funding Agencies|VR|70529001|Available from: 2012-02-03 Created: 2012-02-03 Last updated: 2017-12-08
Boström, M., Ellingsen, S. A., Brevik, I., Parsons, D. F. & Sernelius, B. (2012). Sign of the Casimir-Polder interaction between atoms and oil-water interfaces: Subtle dependence on dielectric properties. Physical Review A. Atomic, Molecular, and Optical Physics, 85(6), 064501
Open this publication in new window or tab >>Sign of the Casimir-Polder interaction between atoms and oil-water interfaces: Subtle dependence on dielectric properties
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2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 6, p. 064501-Article in journal (Refereed) Published
Abstract [en]

We demonstrate that Casimir-Polder energies between noble gas atoms (dissolved in water) and oil-water interfaces are highly surface specific. Both repulsion (e.g., hexane) and attraction (e.g., glycerine and cyclodecane) is found with different oils. For several intermediate oils (e.g., hexadecane, decane, and cyclohexane) both attraction and repulsion can be found in the same system. Near these oil-water interfaces the interaction is repulsive in the nonretarded limit and turns attractive at larger distances as retardation becomes important. These highly surface specific interactions may have a role to play in biological systems where the surface may be more or less accessible to dissolved atoms.

Place, publisher, year, edition, pages
American Physical Society, 2012
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-79797 (URN)10.1103/PhysRevA.85.064501 (DOI)000305250200002 ()
Available from: 2012-08-17 Created: 2012-08-14 Last updated: 2017-12-07
Lima, E. R. A., Boström, M., Schwierz, N., Sernelius, B. & Tavares, F. W. (2011). Attractive double-layer forces between neutral hydrophobic and neutral hydrophilic surfaces. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, 84(6), 061903
Open this publication in new window or tab >>Attractive double-layer forces between neutral hydrophobic and neutral hydrophilic surfaces
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2011 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 84, no 6, p. 061903-Article in journal (Refereed) Published
Abstract [en]

The interaction between surface patches of proteins with different surface properties has a vital role to play driving conformational changes in proteins in different salt solutions. We demonstrate the existence of ion-specific attractive double-layer forces between neutral hydrophobic and hydrophilic surfaces in the presence of certain salt solutions. This is performed by solving a generalized Poisson-Boltzmann equation for two unequal surfaces. In the calculations, we utilize parametrized ion-surface potentials and dielectric-constant profiles deduced from recent non-primitive-model molecular dynamics simulations that partially account for molecular structure and hydration effects.

Place, publisher, year, edition, pages
American Physical Society, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-73312 (URN)10.1103/PhysRevE.84.061903 (DOI)297794200007 ()
Available from: 2012-01-03 Created: 2012-01-02 Last updated: 2017-12-08
Salis, A., Parsons, D. F., Boström, M., Medda, L., Barse, B., Ninham, B. W. & Monduzzi, M. (2010). Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica. Langmuir, 26(4), 2484-2490
Open this publication in new window or tab >>Ion Specific Surface Charge Density of SBA-15 Mesoporous Silica
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2010 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 26, no 4, p. 2484-2490Article in journal (Refereed) Published
Abstract [en]

Potentiometric titrations were used to estimate the surface charge density of SBA-15 mesoporous silica in differentsalt solutions. It was found that surface charge depends both on cation type, following a Hofmeister series (Csþ<Guanidiniumþ<Kþ<Naþ<Liþ), and on salt concentration (in the range 0.05-1 M). The surface charge series isreproduced by theoretical calculations performed using a modified Poisson-Boltzmann equation that includes ionicdispersion forces with ab initio ion polarizabilities and hydrated ions. The hydration model assigns an explicit hydrationshell to kosmotropic (strong hydrated) ions only. The Hofmeister series appears to be due to the combination of ionsurfacedispersion interactions and ion hydration.

National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-52026 (URN)10.1021/la902721a (DOI)000274342200047 ()
Available from: 2009-11-30 Created: 2009-11-30 Last updated: 2017-12-12
Lima, E. R., Biscaia Jr, E. C., Boström, M. & Tavares, F. W. (2010). Ion-specific thermodynamical properties of aqueous proteins. ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS, 82(1), 109-126
Open this publication in new window or tab >>Ion-specific thermodynamical properties of aqueous proteins
2010 (English)In: ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS, ISSN 0001-3765, Vol. 82, no 1, p. 109-126Article in journal (Refereed) Published
Abstract [en]

Ion-specific interactions between two colloidal particles are calculated using a modified Poisson-Boltzmann (PB) equation and Monte Carlo (MC) simulations. PB equations present good results of ionic concentration profiles around a macroion, especially for salt solutions containing monovalent ions. These equations include not only electrostatic interactions, but also dispersion potentials originated from polarizabilities of ions and proteins. This enables us to predict ion-specific properties of colloidal systems. We compared results obtained from the modified PB equation with those from MC simulations and integral equations. Phase diagrams and osmotic second virial coefficients are also presented for different salt solutions at different pH and ionic strengths, in agreement with the experimental results observed Hofmeister effects. In order to include the water structure and hydration effect, we have used an effective interaction obtained from molecular dynamics of each ion and a hydrophobic surface combined with PB equation. The method has been proved to be efficient and suitable for describing phenomena where the water structure close to the interface plays an essential role. Important thermodynamic properties related to protein aggregation, essential in biotechnology and pharmaceutical industries, can be obtained from the method shown here.

Keywords
colloid stability, Hofmeister series, potential of mean force, proteins
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-54512 (URN)10.1590/S0001-37652010000100010 (DOI)000275325900010 ()20209247 (PubMedID)
Available from: 2010-03-19 Created: 2010-03-19 Last updated: 2014-10-06
Boström, M., Lima, E. R. A., Biscaia Jr., E. C., Tavares, F. W. & Kunz, W. (2010). Modifying the Poisson-Boltzmann Approach to Model Specific Ion Effects. In: Werner Kunz (Ed.), Specific Ion Effects (pp. 293-309). Singapore: World Scientific Publishing Co. Pte. Ltd.
Open this publication in new window or tab >>Modifying the Poisson-Boltzmann Approach to Model Specific Ion Effects
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2010 (English)In: Specific Ion Effects / [ed] Werner Kunz, Singapore: World Scientific Publishing Co. Pte. Ltd. , 2010, p. 293-309Chapter in book (Other academic)
Abstract [en]

Specific ion effects are important in numerous fields of science and technology. They have been discussed for over 100 years, ever since the pioneering work done by Franz Hofmeister and his group in Prague. Over the last decades, hundreds of examples have been published and periodically explanations have been proposed. However, it is only recently that a profound understanding of the basic effects and their reasons could be achieved. Today, we are not far from a general explanation of specific ion effects. This book summarizes the main new ideas that have come up in the last ten years.

In this book, the efforts of theoreticians are substantially supported by the experimental results stemming from new and exciting techniques. Both the new theoretical concepts and the experimental landmarks are collected and critically discussed by eminent scientists and well-known specialists in this field. Beyond the rigorous explanations, guidelines are given to non-specialists in order to help them understand the general rules governing specific ion effects in chemistry, biology, physics and engineering.

Place, publisher, year, edition, pages
Singapore: World Scientific Publishing Co. Pte. Ltd., 2010
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-54376 (URN)978-981-4271-57-8 (ISBN)
Available from: 2010-03-11 Created: 2010-03-11 Last updated: 2013-04-10Bibliographically approved
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