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Träfflista för sökning "LAR1:uu ;hsvcat:2;pers:(Strömme Maria 1970)"

Sökning: LAR1:uu > Teknik > Strömme Maria 1970

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1.
  • Åhlén, Michelle, et al. (författare)
  • Pore size effect of 1,3,6,8-tetrakis(4-carboxyphenyl)pyrene-based metal-organic frameworks for enhanced SF 6 adsorption with high selectivity
  • 2022
  • Ingår i: Microporous and Mesoporous Materials. - : Elsevier BV. - 1387-1811 .- 1873-3093. ; 343
  • Tidskriftsartikel (refereegranskat)abstract
    • Anthropogenic greenhouse gas emission poses as serious threat to our environment and it is therefore of utmost importance that efficient systems are developed to mitigate these issues. SF6, in particular, has attracted more attention in recent years due to its global warming potential which severely exceeds that of CO2. In this study we present the SF6 sorption properties of four highly porous 1,3,6,8-tetrakis(4-carboxyphenyl)pyrene-based (TBAPy4−) metal-organic frameworks containing either ytterbium(III), thulium(III), cerium(III), or hafnium(IV). These MOFs can be synthesized with high crystallinity in as little as 5 h and were found to have good SF6 uptakes due to their suitable pore size. The SF6 uptake of the Yb-TBAPy MOF reached 2.33 mmol g−1 with high Henry's law SF6-over-N2 selectivity of ∼80 at 1 bar and 293 K. The TBAPy-MOFs were also found to have good chemical stability and good cyclic SF6 sorption stability with fast SF6 uptake. These TBAPy-MOFs possesses many of the properties desired for an efficient SF6 sorbent and may be suitable sorbents for further development, including sorbent processing for industrial applications.
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2.
  • Sun, Rui, et al. (författare)
  • Highly Porous Amorphous Calcium Phosphate for Drug Delivery and Bio-Medical Applications
  • 2020
  • Ingår i: Nanomaterials. - : MDPI. - 2079-4991. ; 10:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Amorphous calcium phosphate (ACP) has shown significant effects on the biomineralization and promising applications in bio-medicine. However, the limited stability and porosity of ACP material restrict its practical applications. A storage stable highly porous ACP with Brunauer–Emmett–Teller surface area of over 400 m2/g was synthesized by introducing phosphoric acid to a methanol suspension containing amorphous calcium carbonate nanoparticles. Electron microscopy revealed that the porous ACP was constructed with aggregated ACP nanoparticles with dimensions of several nanometers. Large angle X-ray scattering revealed a short-range atomic order of <20 Å in the ACP nanoparticles. The synthesized ACP demonstrated long-term stability and did not crystallize even after storage for over 14 months in air. The stability of the ACP in water and an α-MEM cell culture medium were also examined. The stability of ACP could be tuned by adjusting its chemical composition. The ACP synthesized in this work was cytocompatible and acted as drug carriers for the bisphosphonate drug alendronate (AL) in vitro. AL-loaded ACP released 25% of the loaded AL in the first 22 days. These properties make ACP a promising candidate material for potential application in biomedical fields such as drug delivery and bone healing.
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3.
  • Metreveli, Giorgi, et al. (författare)
  • A Size-Exclusion Nanocellulose Filter Paper for Virus Removal
  • 2014
  • Ingår i: Advanced Healthcare Materials. - : Wiley. - 2192-2640 .- 2192-2659. ; 10:3, s. 1546-1550
  • Tidskriftsartikel (refereegranskat)abstract
    • This is the first time a 100% natural, unmodified nanofibrous polymer-based membrane is demonstrated capable of removing viruses solely based on the size-exclusion principle, with log10 reduction value (LRV) ≥ 6.3 as limited by the assay lower detection limit and the feed virus titre, thereby matching the performance of industrial synthetic polymer virus removal filters.
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4.
  • Palo-Nieto, Carlos, 1985-, et al. (författare)
  • Functionalization of cellulose nanofibrils to develop novel ROS-sensitive biomaterials
  • 2023
  • Ingår i: Materials Advances. - : Royal Society of Chemistry. - 2633-5409. ; 4:6, s. 1555-1565
  • Tidskriftsartikel (refereegranskat)abstract
    • Wood derived cellulose nanofibrils (CNFs) have emerged as an interesting material for biomedical applications. Functionalization of the nanofibrils with bioactive molecules is a potent tool to tailor CNF materials for specific applications in biomedicine. The present work proposes the functionalization of CNFs with a reactive oxygen species (ROS)-sensitive oligopeptide to develop a novel CNF-based material for the treatment of medical conditions associated with high levels of ROS such as chronic wounds. Oligoproline peptides of two different lengths (5 and 10 proline units) were covalently incorporated onto the CNF surface, several water-based chemical approaches were explored and the reaction conditions to maximize peptide substitution and the degree of fibre crosslinking were optimized. The chemical structure, degree of peptide substitution, degree of fibre crosslinking, surface morphology and ROS-sensitivity of the oligoproline–CNF materials were characterized. Double-crosslinked CNF hydrogels (Ca2+–oligoproline–CNF) were further prepared and the ability of the hydrogels to protect cells from an oxidative environment was investigated in vitro with human dermal fibroblasts, as a first evaluation of the potential of the novel CNF material to be used in chronic wound therapies. Optimization of the reaction conditions resulted in a degree of peptide substitution of 102 ± 10 μmol g−1 CNF irrespective of the oligoproline length and a degree of crosslinking of 55–80% depending on the number of proline units. The results showed that the oligoproline covalently attached to CNFs via carbodiimide chemistry maintained its ability to respond to ROS and that the responsiveness in terms of viscoelastic properties depended on the length of the oligopeptide, with the hydrogel being more responsive when functionalized with 10 proline units compared with 5 proline units. Furthermore, the double crosslinked Ca2+–oligoproline–CNF hydrogels promoted the survival of human dermal fibroblasts exposed to high levels of ROS. This study is the first one to provide an insight into the development of ROS-sensitive materials based on CNFs and opens up possibilities for further investigation on the use of these novel materials in chronic wound care.
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5.
  • Sjödin, Martin, 1974-, et al. (författare)
  • Designing Quinone-based Conducting Redox Polymers specifically for Aqueous Proton Batteries and for Lithium Ion Battery Cathodes
  • 2020
  • Konferensbidrag (refereegranskat)abstract
    •  Conducting redox polymers (CRPs) are conducting polymers that have been decorated with redox active functional groups and they provide an attractive alternative as organic matter based electrical energy storage materials. The purpose of the polymer backbone is two-fold, 1) it prevents dissolution of the redox group and, 2) it renders the material conductive. The redox active pendant groups, on the other hand, provide the material with a well-defined redox reaction as well as a high charge storage capacity. CRPs thus provide a solution to two of the most significant obstacles in achieving powerful and stable battery materials from organic compounds, i.e. materials dissolution and limited electronic conductivity while simultaneously providing a high charge storage capacity. For battery applications it is thus essential that the individual properties of the conducting polymer backbone and the redox group can be preserved and that they operate in synergy in the CRP. One prerequisite for synergetic polymer-pendant combinations is redox matching. As conducting polymers are only conducting in their charged state successful combinations rely on that the pendant group has a redox potential within the conducting region of the polymer backbone. In addition, the CRP must allow mass transport of ions, not only related to the cycling chemistry of the pendant group but also ions related to the doping of the polymer backbone. These requirements put significantly different demands on the polymer design for the development of aqueous proton batteries and for CRPs for lithium cycling cathodes. In this presentation specific CRP design-solutions will be presented that allow for the development of all-organic proton batteries 1,2 and for lithium ion CRP-battery cathodes 3. In addition, a solution-processing method, termed Post Deposition Polymerization (PDP), for CRP-materials and the underlying principles and requirements for PDP will be presented. Importantly, in PDP the processing step occurs prior to polymerization. After depositing and drying of the repeat-unit precursor onto a substrate polymerization is achieved by oxidative polymerization of the precursor. The PDP-method opens up for a scalable method for the coating of CRP materials onto any substrate and can, for instance, be used to make nanostructured CRP materials.1              Emanuelsson, R., Sterby, M., Strømme, M. & Sjödin, M. An All-Organic Proton Battery. J. Am. Chem. Soc. 139, 4828-4834, doi:10.1021/jacs.7b00159 (2017).2              Strietzel, C. et al. Accepted in Angewandte Chemie doi:10.1002/anie.202001191 (2020).3              Wang, H. et al. Redox-State-Dependent Interplay between Pendant Group and Conducting Polymer Backbone in Quinone-Based Conducting Redox Polymers for Lithium Ion Batteries. ACS Applied Energy Materials 2, 7162-7170, doi:10.1021/acsaem.9b01130 (2019).
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6.
  • Sun, Rui, et al. (författare)
  • Amorphous Calcium Carbonate Constructed from Nanoparticle Aggregates with Unprecedented Surface Area and Mesoporosity
  • 2018
  • Ingår i: ACS Applied Materials and Interfaces. - : American Chemical Society (ACS). - 1944-8244 .- 1944-8252. ; 10:25, s. 21556-21564
  • Tidskriftsartikel (refereegranskat)abstract
    • Amorphous calcium carbonate (ACC), with the highest reported specific surface area of all current forms of calcium carbonate (over 350 m(2) g(-1)), was synthesized using a surfactant-free, one-pot method. Electron microscopy, helium pycnometry, and nitrogen sorption analysis revealed that this highly mesoporous ACC, with a pore volume of similar to 0.86 cm(3) g(-1) and a pore-size distribution centered at 8-9 nm, is constructed from aggregated ACC nanoparticles with an estimated average diameter of 7.3 nm. The porous ACC remained amorphous and retained its high porosity for over 3 weeks under semi-air-tight storage conditions. Powder X-ray diffraction, large-angle X-ray scattering, infrared spectroscopy, and electron diffraction exposed that the porous ACC did not resemble any of the known CaCO3 structures. The atomic order of porous ACC diminished at interatomic distances over 8 angstrom. Porous ACC was evaluated as a potential drug carrier of poorly soluble substances in vitro. Itraconazole and celecoxib remained stable in their amorphous forms within the pores of the material. Drug release rates were significantly enhanced for both drugs (up to 65 times the dissolution rates for the crystalline forms), and supersaturation release of celecoxib was also demonstrated. Citric acid was used to enhance the stability of the ACC nanoparticles within the aggregates, which increased the surface area of the material to over 600 m(2) g(-1). This porous ACC has potential for use in various applications where surface area is important, including adsorption, catalysis, medication, and bone regeneration.
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7.
  • Sun, Rui, et al. (författare)
  • Hierarchical Porous Carbon Synthesized from Novel Porous Amorphous Calcium or Magnesium Citrate with Enhanced SF6 Uptake and SF6/N-2 Selectivity
  • 2019
  • Ingår i: Acs Applied Nano Materials. - : American Chemical Society (ACS). - 2574-0970. ; 2:2, s. 778-789
  • Tidskriftsartikel (refereegranskat)abstract
    • The emission of greenhouse gases such as CO2 and SF6 is believed to contribute significantly toward global warming. One way to reduce their release is by adsorption at point sources using a suitable adsorbent. In this work we present the synthesis of two hierarchical porous carbon materials (referred to as PC-CaCit and PC-MgCit) with a high uptake of SF 6 (5.23 mmol/g, 0 degrees C, 100 kPa) and a reasonable uptake of CO2 (>3 mmol/g). PC-CaCit and PC-MgCit were obtained by pyrolysis of the most porous calcium citrate and magnesium citrate ever reported, which were synthesized by us. The Langmuir specific surface area of PC-CaCit and PC-MgCit was over 2000 m(2)/g (BET surface area also close to 2000 m(2)/g). We characterized PC-CaCit and PC-MgCit using a range of advanced characterization techniques including N-2 adsorption, high-resolution electron microscopy, powder X-ray diffraction, and X-ray photoelectron spectroscopy. PC-CaCit and PC-MgCit also showed a SF6-over-N-2 selectivity of similar to 33 at 0 degrees C (100 kPa), good cyclic performance, and moderately low heat of adsorption. The porous carbons synthesized in this work are good candidate adsorbents for greenhouse gases.
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8.
  • Xu, Chao, et al. (författare)
  • Microporous organic polymers as CO2 adsorbents : advances and challenges
  • 2020
  • Ingår i: Materials Today Advances. - : Elsevier BV. - 2590-0498. ; 6
  • Forskningsöversikt (refereegranskat)abstract
    • Microporous organic polymers (MOPs) with internal pores less than 2 nm have potential use in gas separation, sensing, and storage, in the form of membranes, monoliths, fibers, or adsorbent granules. These covalently bonded polymers are being formed by reacting with rigid organic monomers, and MOPs have lately been studied for capturing CO2 from gas mixtures in the form of membranes and adsorbents. Especially, the potential of MOPs in the processes of carbon capture and storage has been in the focus and small pore MOPs are preferred for regular separation processes but larger pores could be suitable if cryogenic processes would be used. Recent studies (2014 – mid 2019) on the potential use of MOPs as CO2 adsorbents and, to some degree, CO2-selective membranes are reviewed.
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9.
  • Zhou, Shengyang, et al. (författare)
  • Elastic Aerogels of Cellulose Nanofibers@Metal–Organic Frameworks for Thermal Insulation and Fire Retardancy
  • 2020
  • Ingår i: Nano-Micro Letters. - : Springer Science and Business Media LLC. - 2150-5551 .- 2311-6706. ; 12:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Metal–organic frameworks (MOFs) with high microporosity and relatively high thermal stability are potential thermal insulation and flame-retardant materials. However, the difficulties in processing and shaping MOFs have largely hampered their applications in these areas. This study outlines the fabrication of hybrid CNF@MOF aerogels by a stepwise assembly approach involving the coating and cross-linking of cellulose nanofibers (CNFs) with continuous nanolayers of MOFs. The cross-linking gives the aerogels high mechanical strength but superelasticity (80% maximum recoverable strain, high specific compression modulus of ~ 200 MPa cm3 g−1, and specific stress of ~ 100 MPa cm3 g−1).The resultant lightweight aerogels have a cellular network structure and hierarchical porosity, which render the aerogels with relatively low thermal conductivity of ~ 40 mW m−1 K−1. The hydrophobic, thermally stable MOF nanolayers wrapped around the CNFs result in good moisture resistance and fire retardancy. This study demonstrates that MOFs can be used as efficient thermal insulation and flame-retardant materials. It presents a pathway for the design of thermally insulating, superelastic fire-retardant nanocomposites based on MOFs and nanocellulose.
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10.
  • Blasi-Romero, Anna, et al. (författare)
  • In Vitro Investigation of Thiol-Functionalized Cellulose Nanofibrils as a Chronic Wound Environment Modulator
  • 2021
  • Ingår i: Polymers. - : MDPI. - 2073-4360. ; 13:2
  • Tidskriftsartikel (refereegranskat)abstract
    • There is currently a huge need for new, improved therapeutic approaches for the treatment of chronic wounds. One promising strategy is to develop wound dressings capable of modulating the chronic wound environment (e.g., by controlling the high levels of reactive oxygen species (ROS) and proteases). Here, we selected the thiol-containing amino acid cysteine to endow wood-derived cellulose nanofibrils (CNF) with bioactivity toward the modulation of ROS levels and protease activity. Cysteine was covalently incorporated into CNF and the functionalized material, herein referred as cys-CNF, was characterized in terms of chemical structure, degree of substitution, radical scavenging capacity, and inhibition of protease activity. The stability of the thiol groups was evaluated over time, and an in vitro cytotoxicity study with human dermal fibroblasts was performed to evaluate the safety profile of cys-CNF. Results showed that cys-CNF was able to efficiently control the activity of the metalloprotease collagenase and to inhibit the free radical DPPH (1,1-Diphenyl-2-picrylhydrazyl radical), activities that were correlated with the presence of free thiol groups on the nanofibers. The stability study showed that the reactivity of the thiol groups challenged the bioactivity over time. Nevertheless, preparing the material as an aerogel and storing it in an inert atmosphere were shown to be valid approaches to increase the stability of the thiol groups in cys-CNF. No signs of toxicity were observed on the dermal fibroblasts when exposed to cys-CNF (concentration range 0.1-0.5 mg/mL). The present work highlights cys-CNF as a promising novel material for the development of bioactive wound dressings for the treatment of chronic wounds.
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