0000000000937078

AUTHOR

Esa Lehtimäki

showing 7 related works from this author

Self-Assembly of Water-Mediated Supramolecular Cationic Archimedean Solids

2013

Understanding the self-assembly of small structural units into large supramolecular assemblies remains one of the great challenges in structural chemistry. We have discovered that tetrahedral supramolecular cages, exhibiting the shapes of Archimedean solids, can be self-assembled by hydrogen bonding interactions using tricationic N-donors (1 or 2) in cooperation with water (W). Single crystal X-ray analysis shows that cage (2)4(W)6, assembled in an aqueous solution of cation 2 and KPF6, consists of four tripodal trications linked by six water monomers and resembles the shape of a truncated tetrahedron. Similarly, cage (1)4(W6)4 spontaneously self-assembles in an aqueous solution of cation 1…

Aqueous solutionHydrogen bondChemistryCrystal chemistrySupramolecular chemistryGeneral ChemistryCondensed Matter PhysicsArchimedean solidCrystallographysymbols.namesakeTruncated tetrahedronTetrahedronsymbolsGeneral Materials ScienceSelf-assemblyta116Crystal Growth & Design
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A salt-induced mechanism for the swelling of black liquor droplet during devolatilization

2017

Abstract Black liquor (BL) from the pulp and paper industry is a significant bioenergy source. Swelling of BL droplet during the pyrolysis stage of combustion and gasification is a profound phenomenon affecting various boiler processes. However, the mechanism for droplet swelling has remains a puzzle due to an insufficient understanding of the formation of the plastic droplet at the pyrolysis stage of the thermal conversion. Thermogravimetric studies with model aliphatic carboxylates unraveled the melting and decomposition behavior of the complex mixture of BL salts during pyrolysis, indicating that the melting of salts forming a liquid state may be the primary cause for the development of …

Thermogravimetric analysisGeneral Chemical EngineeringmechanismligninEnergy Engineering and Power Technologyblack liquor02 engineering and technologyCombustionswellingchemistry.chemical_compoundmedicineOrganic chemistryLigninCharta116ta215040101 forestryChemistryOrganic Chemistrytechnology industry and agriculture04 agricultural and veterinary sciencesAtmospheric temperature range021001 nanoscience & nanotechnologyaliphatic carboxylatesFuel TechnologyChemical engineering0401 agriculture forestry and fisheriesSwellingmedicine.symptom0210 nano-technologyPyrolysisBlack liquorcombustionFuel
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Determination of metal concentrations in certified plastic reference materials after small-size autoclave and microwave-assisted digestion followed w…

2017

Abstract The digestion methods for the determination of As, Cd, Cr, Pb, Sb, Sn and Zn concentrations in plastic samples using microwave-assisted digestion (MW-AD) and small-size autoclave digestion was developed. The certified polyethylene, polypropylene, polyvinyl chloride and acrylonitrile butadiene styrene certified reference materials were used in order to find digestion method working properly for several sample matrices. Efficiency of the digestion methods was evaluated by analyzing the residual carbon in digests by TOC analyzer. MW-AD using a mixture of 7 mL of HNO 3 and 3 mL of H 2 O 2 as a digestion solution resulted in excellent recoveries for As, Cd, Pb, Sb and Zn, and were in th…

microwavedigestion010402 general chemistry01 natural sciencesAnalytical ChemistryAutoclavechemistry.chemical_compounddeterminationDigestion (alchemy)plasticta116InstrumentationSpectroscopyPolypropyleneautoclaveChromatographyAcrylonitrile butadiene styreneruoansulatus010401 analytical chemistryAtomic and Molecular Physics and Optics0104 chemical sciencesPolyvinyl chlorideCertified reference materialschemistrymuoviInductively coupled plasma atomic emission spectroscopyICP-OESInductively coupled plasmaSpectrochimica Acta Part B: Atomic Spectroscopy
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CCDC 947464: Experimental Crystal Structure Determination

2013

Related Article: Anssi Peuronen, Esa Lehtimäki, and Manu Lahtinen|2013|Cryst.Growth Des.|13|4615|doi:10.1021/cg401246n

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters11'1''-((246-trimethylbenzene-135-triyl)tris(methylene))tris(4-aza-1-azoniabicyclo[2.2.2]octane) potassium oxonium pentakis(hexafluorophosphate) hemihydrate unknown solvateExperimental 3D Coordinates
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CCDC 947462: Experimental Crystal Structure Determination

2013

Related Article: Anssi Peuronen, Esa Lehtimäki, and Manu Lahtinen|2013|Cryst.Growth Des.|13|4615|doi:10.1021/cg401246n

Space GroupCrystallographyCrystal SystemCrystal StructureCell Parameters11'1''-(Benzene-135-triyltris(methylene))tris(4-aza-1-azoniabicyclo[2.2.2]octane) tetrakis(hexafluorophosphate)-potassiumExperimental 3D Coordinates
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CCDC 947463: Experimental Crystal Structure Determination

2013

Related Article: Anssi Peuronen, Esa Lehtimäki, and Manu Lahtinen|2013|Cryst.Growth Des.|13|4615|doi:10.1021/cg401246n

tetrakis(11'1''-(Benzene-135-triyltris(methylene))tris(4-aza-1-azoniabicyclo[2.2.2]octane)) tris(oxonium) pentadecakis(hexafluorophosphate) nonahydrateSpace GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates
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CCDC 947465: Experimental Crystal Structure Determination

2013

Related Article: Anssi Peuronen, Esa Lehtimäki, and Manu Lahtinen|2013|Cryst.Growth Des.|13|4615|doi:10.1021/cg401246n

Space GroupCrystallographyCrystal SystemCrystal StructureCell ParametersExperimental 3D Coordinates11'1''-((246-Trimethylbenzene-135-triyl)tris(methylene))tris-4-aza-1-azoniabicyclo[2.2.2]octane tris(hexafluorophosphate) heptahydrate
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