Negative refractive index materials and propagation

Negative refractive index materials and propagation of electromagnetic waves in them started to draw attention of scientists not so long ago. This review highlights historically important and recent papers on practical and theoretical aspects related to these issues. Namely, basic properties and peculiarities of such materials related to both their design and wave propagation in them, experimental verification of predictions theoretically made for them, possible practical applications and prospects in this area are considered.

Industrial-Scale hydrothermal carbonization of waste sludge materials for fuel production

Hydrothermal carbonization (HTC) is a thermochemical process used in the production of charred matter similar in composition to coal. It involves the use of wet, carbohydrate feedstock, a relatively low temperature environment (180 °C-350 °C) and high autogenous pressure (up to 2,4 MPa) in a closed system. Various applications of the solid char product exist, opening the way for a range of biomass feedstock materials to be exploited that have so far proven to be troublesome due to high water content or other factors. Sludge materials are investigated as candidates for industrial-scale HTC treatment in fuel production. In general, HTC treatment of pulp and paper industry sludge (PPS) and anaerobically digested municipal sewage sludge (ADS) using existing technology is competitive with traditional treatment options, which range in price from EUR 30-80 per ton of wet sludge. PPS and ADS can be treated by HTC for less than EUR 13 and 33, respectively. Opportunities and challenges related to HTC exist, as this relatively new technology moves from laboratory and pilot-scale production to an industrial scale. Feedstock materials, end-products, process conditions and local markets ultimately determine the feasibility of a given HTC operation. However, there is potential for sludge materials to be converted to sustainable bio-coal fuel in a Finnish context.

Kaksi tietä huipulle. Media ja puoluejohtajuus Suomessa naisten noususta populismin aaltoon

Tässä väitöskirjassa tarkastellaan suomalaisen puoluejohtajuuden ja suuren puolueen johtajaksi nousun murroskautta 1980-luvun lopulta 2010-luvulle median ja politiikan vuorovaikutuksen näkökulmasta. Puolueiden johtaminen on myös Suomessa ollut miesten työtä, ja perinteisesti tehtävään on ollut yksi väylä: asettuminen ehdolle puheenjohtajavaalissa ja valituksi tulo puoluekokouksessa. Tarkastelujakson alkupuolella naisia oli Suomessa ensimmäistä kertaa ehdolla suurten puolueiden puheenjohtajavaaleissa. Kauden loppupuolella heitä myös valittiin tuohon tehtävään ja ensimmäiset naiset nousivat pääministeriksi. Tämä historiallinen murros päätti liki satavuotisen perinteen, jossa miehet ovat olleet Suomessa sekä suurten puolueiden että hallitustyön johtajia. Julkisessa keskustelussa kysymys tasa-arvosta jäi toissijaiseksi: naisia alettiin valita puoluejohtajiksi tilanteissa, joissa heidän valintansa nähtiin puolueille edulliseksi. Naisen valinta tulkittiin miehen valintaa merkittävämmäksi symboliseksi viestiksi, johon liitettiin ajatuksia uudistumisesta ja puolueen julkisuuskuvan parantamisesta. Merkille pantavaa on, että naisten ensimmäiset valinnat suurten puolueiden johtajiksi tapahtuivat vaiheessa, jossa puoluejohtajien valta-asema on vahvin kautta suomalaisen poliittisen historian. Tässä valossa näyttää siltä, että valta ei aina pakenekaan naisilta. Vaikka suomalainen yhteiskunta ja suomalaiset naiset ovat monessa mielessä olleet edelläkävijöitä tasa-arvon suhteen, politiikan johtopaikkoja tavoitelleet naiset ovat meilläkin kohdanneet kansainvälisessä tutkimuksessa naisten haasteeksi osoitettuja lasikattoja, pyöröovia ja liukkaita jyrkänteitä. Tutkittavan ajanjakson aikana konkretisoitui myös toinen mahdollinen, joskin poikkeuksellinen reitti suuren puolueen johtajaksi: pienen puolueen nouseminen suurten joukkoon eduskuntavaaleissa. Tämä vaihtoehto toteutui vuonna 2011 perussuomalaisten eduskuntavaalivoiton myötä. Perussuomalaisten nousu eduskunnan pienimmästä puolueesta kolmanneksi suurimmaksi mursi perinteisen kolmen suuren puolueen asetelman. Puolueen menestyksen seuraukset ovat olleet kauaskantoisemmat kuin ehkä ensin ajateltiin: perussuomalaisten vaalivoiton sosiaalidemokraateille, keskustalle, ja kokoomukselle aiheuttama järkytys heijastui myöhemmin myös niiden johtajavaihdoksiin ja -valintoihin. Sekä naisten läpimurrossa että populismin voittokulussa median rooli oli monisyisempi kuin siihen perinteisesti liitetty tiedon välittäjän ja valtaa pitävien toimia kriittisesti seuraavan neljännen valtiomahdin tehtävänkuva. Tutkittavalla jaksolla tiedotusvälineet tekivät onnistuneen intervention politiikan osapuoleksi. Toimittajat ottivat kantaa valintoihin ja ohjeistivat puolueita, ja puolueet taas mukauttivat näkyvyyden maksimoidakseen käytäntöjään median tarpeisiin. 1980-luvun lopulta 2010-luvulle ulottuvalla jaksolla suuren puolueen puoluejohtajaksi valikoitumisen kriteerit muuttuivat, samalla kun median merkitys johtajavalinnoissa ja myös puoluejohtajan käytännön työssä kasvoi. Mediasta tuli aiempaa konkreettisemmin johtajavalintojen ja valtakamppailun areena, ja siihen liittyvät näkökohdat nousivat myös keskeisiksi johtajan taitoja arvioitaessa. Kuka ehdokkaista toisi näkyvyyttä, ”pärjäisi” median paineissa ja vakuuttaisi äänestäjät? Vielä 1980- ja 1990-lukujen taitteessa johtajavalinnat olivat pitkälti puolueorganisaatioiden hallinnoimia prosesseja, joista lehdistö raportoi askeleen jäljessä kulkien. Viimeistään 2000-luvun ensimmäisellä vuosikymmenellä puolueet omaksuivat ajatuksen median hyödyllisyydestä. Tämän strategisen muutoksen myötä puolueet tulivat samalla luovuttaneeksi määriteltyvaltaa oman organisaationsa ulkopuolelle. Kokoomuksen vuoden 2014 johtajavaalissa silmiinpistävää oli pyrkimys sekä hyötyä julkisuudesta että palauttaa valtaa takaisin puolueelle. Politiikan mediajulkisuuden alttius tarttua myyviin poliitikkopersooniin, ilmiöihin, ristiriitoihin ja draamaan sekä vastaavasti populistijohtaja Timo Soinin ja perussuomalaisten kyky tarjota kaikkia näitä auttoivat puolueen suurvoittoon vuoden 2011 eduskuntavaaleissa. Organisaatioltaan pieni ja johtajaansa henkilöityvä puolue sai selvästi poliittista painoarvoaan suuremman julkisuuden, koska kiinnostavuus määritti näkyvyyden ja puolueen nousevasta kannatuksesta tuli yksi vaalien pääaiheista. Median ja politiikan suhteessa tapahtuneet muutokset olivat vauhdittamassa niin naisten nousua suurten puolueiden johtajiksi kuin populistisen johtajuuden läpimurtoa ja perussuomalaisten menestystä. Koska suurten puolueiden johtajista valikoituvat myös pääministerit, näiden muutosten vaikutus ulottuu Suomen poliittisesti vaikutusvaltaisimpaan tehtävään asti.

Utilization of steelmaking waste materials for production of calcium carbonate (CaCO3)

The steel industry produces, besides steel, also solid mineral by-products or slags, while it emits large quantities of carbon dioxide (CO2). Slags consist of various silicates and oxides which are formed in chemical reactions between the iron ore and the fluxing agents during the high temperature processing at the steel plant. Currently, these materials are recycled in the ironmaking processes, used as aggregates in construction, or landfilled as waste. The utilization rate of the steel slags can be increased by selectively extracting components from the mineral matrix. As an example, aqueous solutions of ammonium salts such as ammonium acetate, chloride and nitrate extract calcium quite selectively already at ambient temperature and pressure conditions. After the residual solids have been separated from the solution, calcium carbonate can be precipitated by feeding a CO2 flow through the solution. Precipitated calcium carbonate (PCC) is used in different applications as a filler material. Its largest consumer is the papermaking industry, which utilizes PCC because it enhances the optical properties of paper at a relatively low cost. Traditionally, PCC is manufactured from limestone, which is first calcined to calcium oxide, then slaked with water to calcium hydroxide and finally carbonated to PCC. This process emits large amounts of CO2, mainly because of the energy-intensive calcination step. This thesis presents research work on the scale-up of the above-mentioned ammonium salt based calcium extraction and carbonation method, named Slag2PCC. Extending the scope of the earlier studies, it is now shown that the parameters which mainly affect the calcium utilization efficiency are the solid-to-liquid ratio of steel slag and the ammonium salt solvent solution during extraction, the mean diameter of the slag particles, and the slag composition, especially the fractions of total calcium, silicon, vanadium and iron as well as the fraction of free calcium oxide. Regarding extraction kinetics, slag particle size, solid-to-liquid ratio and molar concentration of the solvent solution have the largest effect on the reaction rate. Solvent solution concentrations above 1 mol/L NH4Cl cause leaching of other elements besides calcium. Some of these such as iron and manganese result in solution coloring, which can be disadvantageous for the quality of the PCC product. Based on chemical composition analysis of the produced PCC samples, however, the product quality is mainly similar as in commercial products. Increasing the novelty of the work, other important parameters related to assessment of the PCC quality, such as particle size distribution and crystal morphology are studied as well. As in traditional PCC precipitation process, the ratio of calcium and carbonate ions controls the particle shape; a higher value for [Ca2+]/[CO32-] prefers precipitation of calcite polymorph, while vaterite forms when carbon species are present in excess. The third main polymorph, aragonite, is only formed at elevated temperatures, above 40-50 °C. In general, longer precipitation times cause transformation of vaterite to calcite or aragonite, but also result in particle agglomeration. The chemical equilibrium of ammonium and calcium ions and dissolved ammonia controlling the solution pH affects the particle sizes, too. Initial pH of 12-13 during the carbonation favors nonagglomerated particles with a diameter of 1 μm and smaller, while pH values of 9-10 generate more agglomerates of 10-20 μm. As a part of the research work, these findings are implemented in demonstrationscale experimental process setups. For the first time, the Slag2PCC technology is tested in scale of ~70 liters instead of laboratory scale only. Additionally, design of a setup of several hundreds of liters is discussed. For these purposes various process units such as inclined settlers and filters for solids separation, pumps and stirrers for material transfer and mixing as well as gas feeding equipment are dimensioned and developed. Overall emissions reduction of the current industrial processes and good product quality as the main targets, based on the performed partial life cycle assessment (LCA), it is most beneficial to utilize low concentration ammonium salt solutions for the Slag2PCC process. In this manner the post-treatment of the products does not require extensive use of washing and drying equipment, otherwise increasing the CO2 emissions of the process. The low solvent concentration Slag2PCC process causes negative CO2 emissions; thus, it can be seen as a carbon capture and utilization (CCU) method, which actually reduces the anthropogenic CO2 emissions compared to the alternative of not using the technology. Even if the amount of steel slag is too small for any substantial mitigation of global warming, the process can have both financial and environmental significance for individual steel manufacturers as a means to reduce the amounts of emitted CO2 and landfilled steel slag. Alternatively, it is possible to introduce the carbon dioxide directly into the mixture of steel slag and ammonium salt solution. The process would generate a 60-75% pure calcium carbonate mixture, the remaining 25-40% consisting of the residual steel slag. This calcium-rich material could be re-used in ironmaking as a fluxing agent instead of natural limestone. Even though this process option would require less process equipment compared to the Slag2PCC process, it still needs further studies regarding the practical usefulness of the products. Nevertheless, compared to several other CO2 emission reduction methods studied around the world, the within this thesis developed and studied processes have the advantage of existing markets for the produced materials, thus giving also a financial incentive for applying the technology in practice.

Chemical derivatization of galactoglucomannan for functional materials

In the framework of the biorefinery concept researchers aspire to optimize the utilization of plant materials, such as agricultural wastes and wood. For most of the known processes, the first steps in the valorisation of biomass are the extraction and purification of the individual components. The obtained raw products by means of a controlled separation can consecutively be modified to result in biofuels or biogas for energy production, but also in value-added products such as additives and important building blocks for the chemical and material industries. Considerable efforts are undertaken in order to substitute the use of oil-based starting materials or at least minimize their processing for the production of everyday goods. Wood is one of the raw materials, which have gained large attention in the last decades and its composition has been studied in detail. Nowadays, the extraction of water-soluble hemicelluloses from wood is well known and so for example xylan can be obtained from hardwoods and O-acetyl galactoglucomannans (GGMs) from softwoods. The aim of this work was to develop water-soluble amphiphilic materials of GGM and to assess their potential use as additives. Furthermore, GGM was also applied as a crosslinker in the synthesis of functional hydrogels for the removal of toxic metals and metalloid ions from aqueous solutions. The distinguished products were obtained by several chemical approaches and analysed by nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), size exclusion chromatography (SEC), thermal gravimetric analysis (TGA), scanning electron microscope SEM, among others. Bio-based surfactants were produced by applying GGM and different fatty acids as starting materials. On one hand, GGM-grafted-fatty acids were prepared by esterification and on the other hand, well-defined GGM-block-fatty acid derivatives were obtained by linking amino-functional fatty acids to the reducing end of GGM. The reaction conditions for the syntheses were optimized and the resultant amphiphilic GGM derivatives were evaluated concerning their ability to reduce the surface tension of water as surfactants. Furthermore, the block-structured derivatives were tested in respect to their applicability as additives for the surface modification of cellulosic materials. Besides the GGM surfactants with a bio-based hydrophilic and a bio-based hydrophobic part, also GGM block-structured derivatives with a synthetic hydrophobic tail, consisting of a polydimethylsiloxane chain, were prepared and assessed for the hydrophobization of surface of nanofibrillated cellulose films. In order to generate GGM block-structured derivatives containing a synthetic tail with distinguished physical and chemical properties, as well as a tailored chain length, a controlled polymerization method was used. Therefore, firstly an initiator group was introduced at the reducing end of the GGM and consecutively single electron transfer-living radical polymerization (SET-LRP) was performed by applying three different monomers in individual reactions. For the accomplishment of the synthesis and the analysis of the products, challenges related to the solubility of the reactants had to be overcome. Overall, a synthesis route for the production of GGM block-copolymers bearing different synthetic polymer chains was developed and several derivatives were obtained. Moreover, GGM with different molar masses were, after modification, used as a crosslinker in the synthesis of functional hydrogels. Hereby, a cationic monomer was used during the free radical polymerization and the resultant hydrogels were successfully tested for the removal of chromium and arsenic ions from aqueous solutions. The hydrogel synthesis was tailored and materials with distinguished physical properties, such as the swelling rate, were obtained after purification. The results generated in this work underline the potential of bio-based products and the urge to continue carrying out research in order to be able to use more green chemicals for the manufacturing of biorenewable and biodegradable daily products.

Modified nano- and microcellulose based adsorption materials in water treatment

In recent decades, industrial activity growth and increasing water usage worldwide have led to the release of various pollutants, such as toxic heavy metals and nutrients, into the aquatic environment. Modified nanocellulose and microcellulose-based adsorption materials have the potential to remove these contaminants from aqueous solutions. The present research consisted of the preparation of five different nano/microcellulose-based adsorbents, their characterization, the study of adsorption kinetics and isotherms, the determination of adsorption mechanisms, and an evaluation of adsorbents’ regeneration properties. The same well known reactions and modification methods that were used for modifying conventional cellulose also worked for microfibrillated cellulose (MFC). The use of succinic anhydride modified mercerized nanocellulose, and aminosilane and hydroxyapatite modified nanostructured MFC for the removal of heavy metals from aqueous solutions exhibited promising results. Aminosilane, epoxy and hydroxyapatite modified MFC could be used as a promising alternative for H2S removal from aqueous solutions. In addition, new knowledge about the adsorption properties of carbonated hydroxyapatite modified MFC as multifunctional adsorbent for the removal of both cations and anions ions from water was obtained. The maghemite nanoparticles (Fe3O4) modified MFC was found to be a highly promising adsorbent for the removal of As(V) from aqueous solutions due to its magnetic properties, high surface area, and high adsorption capacity . The maximum removal efficiencies of each adsorbent were studied in batch mode. The results of adsorption kinetics indicated very fast removal rates for all the studied pollutants. Modeling of adsorption isotherms and adsorption kinetics using various theoretical models provided information about the adsorbent’s surface properties and the adsorption mechanisms. This knowledge is important for instance, in designing water treatment units/plants. Furthermore, the correspondence between the theory behind the model and properties of the adsorbent as well as adsorption mechanisms were also discussed. On the whole, both the experimental results and theoretical considerations supported the potential applicability of the studied nano/microcellulose-based adsorbents in water treatment applications.

Digitization Project of Kindred Languages : materials, methods and tools for researchers

Presentation at "Soome-ugri keelte andmebaasid ja e-leksikograafia" at Eesti Keele Instituut (Institution of Estonian Languages) in Tallnn on the 18th of November 2014.

Enhancing the Usability of Drug Materials by Electrostatic Atomisation

Electrospraying or electrostatic atomisation is a process of liquid disruption by electrostatic forces. When liquid is brought into an electric field, charge is induced to its surface. Once the repulsive electrostatic force exceeds the liquid surface tension, the liquid disrupts into small highly charged droplets. The size of the electrosprayed droplets can range from hundreds of micrometers down to a few tens of nanometers. Electrospraying can be used not only to produce droplets, but also solid particles. The research presented in this thesis concentrates on producing drug particles by this method. In the experiments, a drug powder was dissolved in a convenient solvent and the solution was atomised. The solvent was then evaporated from the formed droplets in a drying medium and inside each droplet, a dense cluster of the dissolved drug remained. From the pharmaceutical point of view, the most important characteristics of the produced particles are size distribution, porosity, crystal form and degree of crystallinity. These properties affect the dissolution behaviour and ultimately the drug bioavailability in the body. The effects of electrostatic atomization on the aforementioned characteristics are generally not well understood. The research focused on studying these particle properties and finding possible correlations with the spraying parameters. The produced droplets were dried either under atmospheric or reduced pressure, the latter in order to improve the drying process. Special emphasis was put on implementing the spraying under reduced pressure, and the effects of the drying pressure on particle properties. Based on the results, the possibilities to enhance the dissolution of poorly soluble drugs by this method were estimated. In the course of experiments, it was also discovered that electrospraying may have a profound effect on the polymorphic form of the produced drug particles. In the light of the obtained results, it was concluded that electrospraying may offer a valuable tool to overcome some of the challenges met in modern drug development and formulation.

Management of Soft Information in Sales and Operations Planning

With a Sales and Operations Planning (S&OP) process, a company aims to manage the demand and supply by planning and forecasting. The studied company uses an integrated S&OP process to improve the company's operations. The aim of this thesis is to develop this business process by finding the best possible way to manage the soft information in S&OP, whilst also understanding the importance and types (assumptions, risks and opportunities) of soft information in S&OP. The soft information in S&OP helps to refine future S&OP planning, taking into account the uncertainties that affect the balance of the long-term demand and supply (typically 12-18 months). The literature review was used to create a framework for soft information management process in S&OP. There were not found a concrete way how to manage soft information in the existing literature. In consequence of the poor literature available the Knowledge Management literature was used as the base for the framework creation, which was seen in the very same type of information management like the soft information management is. The framework created a four-stage process to manage soft information in S&OP that included also the required support systems. First phase is collecting and acquiring soft information in S&OP, which include also categorization. The categorization was the cornerstone to identify different requirements that needs to be taken into consideration when managing soft information in S&OP process. The next phase focus on storing data, which purpose is to ensure the soft information is managed in a common system (support system) in a way that the following phase makes it available to users in S&OP who need by help of sharing and applications process. The last phase target is to use the soft information to understand assumptions and thoughts of users behind the numbers in S&OP plans. With this soft management process the support system will have a key role. The support system, like S&OP tool, ensures that soft information is stored in the right places, kept up-to-date and relevancy. The soft information management process in S&OP strives to improve the relevant soft information documenting behind the S&OP plans into the S&OP support system. The process offers an opportunity to individuals to review, comment and evaluate soft information in S&OP made by their own or others. In the case company it was noticed that without a properly documented and distributed soft information in S&OP it was seen to cause mistrust towards the planning.

Spectroscopic Studies of III-V Semiconductor Materials for Improved Devices

Defects in semiconductor crystals and at their interfaces usually impair the properties and the performance of devices. These defects include, for example, vacancies (i.e., missing crystal atoms), interstitials (i.e., extra atoms between the host crystal sites), and impurities such as oxygen atoms. The defects can decrease (i) the rate of the radiative electron transition from the conduction band to the valence band, (ii) the amount of charge carriers, and (iii) the mobility of the electrons in the conduction band. It is a common situation that the presence of crystal defects can be readily concluded as a decrease in the luminescence intensity or in the current flow for example. However, the identification of the harmful defects is not straightforward at all because it is challenging to characterize local defects with atomic resolution and identification. Such atomic-scale knowledge is however essential to find methods for reducing the amount of defects in energy-efficient semiconductor devices. The defects formed in thin interface layers of semiconductors are particularly difficult to characterize due to their buried and amorphous structures. Characterization methods which are sensitive to defects often require well-defined samples with long range order. Photoelectron spectroscopy (PES) combined with photoluminescence (PL) or electrical measurements is a potential approach to elucidate the structure and defects of the interface. It is essential to combine the PES with complementary measurements of similar samples to relate the PES changes to changes in the interface defect density. Understanding of the nature of defects related to III-V materials is relevant to developing for example field-effect transistors which include a III-V channel, but research is still far from complete. In this thesis, PES measurements are utilized in studies of various III-V compound semiconductor materials. PES is combined with photoluminescence measurements to study the SiO2/GaAs, SiNx/GaAs and BaO/GaAs interfaces. Also the formation of novel materials InN and photoluminescent GaAs nanoparticles are studied. Finally, the formation of Ga interstitial defects in GaAsN is elucidated by combining calculational results with PES measurements.

Geological map of Europe exhibiting the different systems of rocks according to the most recent researches and inedited materials by Roderick I. Murchison and James Nicol ; constructed by A. Keith Johnston

Kartta kuuluu A. E. Nordenskiöldin kokoelmaan

Weld joint characteristics by nano-materials addition

The need for industries to remain competitive in the welding business, has created necessity to develop innovative processes that can exceed customer’s demand. Significant development in improving weld efficiency, during the past decades, still have their drawbacks, specifically in the weld strength properties. The recent innovative technologies have created smallest possible solid material known as nanomaterial and their introduction in welding production has improved the weld strength properties and to overcome unstable microstructures in the weld. This study utilizes a qualitative research method, to elaborate the methods of introducing nanomaterial to the weldments and the characteristic of the welds produced by different welding processes. The study mainly focuses on changes in the microstructural formation and strength properties on the welded joint and also discusses those factors influencing such improvements, due to the addition of nanomaterials. The effect of nanomaterial addition in welding process modifies the physics of joining region, thereby, resulting in significant improvement in the strength properties, with stable microstructure in the weld. The addition of nanomaterials in the welding processes are, through coating on base metal, addition in filler metal and utilizing nanostructured base metal. However, due to its insignificant size, the addition of nanomaterials directly to the weld, would poses complications. The factors having major influence on the joint integrity are dispersion of nanomaterials, characteristics of the nanomaterials, quantity of nanomaterials and selection of nanomaterials. The addition of nanomaterials does not affect the fundamental properties and characteristics of base metals and the filler metal. However, in some cases, the addition of nanomaterials lead to the deterioration of the joint properties by unstable microstructural formations. Still research are ongoing to achieve high joint integrity, in various materials through different welding processes and also on other factors that influence the joint strength.

Palmupohjaisten raaka-aineiden soveltuvuus lämpökynttilämateriaaliksi

Työssä tutkittiin palmupohjaisten raaka-aineiden soveltuvuutta lämpökynttilän valmistukseen steariinin ja parafiinin kanssa. Palmupohjaiset raaka-aineet ovat halvempia kuin steariini ja parafiini, joten raaka-aineen korvaaminen palmupohjaisilla raaka-aineilla voisi tuoda säästöä kynttilänvalmistajalle. Lisäksi niillä voidaan vaikuttaa lämpökynttilän ominaisuuksiin. Teoriaosassa käsiteltiin lämpökynttilän raaka-aineista steariini, parafiini ja palmusteariini. Osassa selitettiin RAL-laatustandardin Quality Mark Candles vaatimukset lämpökynttilälle sekä valuastialle ja keskusteltiin valulämpötilan, jäähdytyksen, viskositeetin ja haaroittuneiden yhdisteiden lukumäärän vaikutuksesta lämpökynttilän koostumukseen. Kokeellisessa osassa valmistettiin lämpökynttilöitä steariinin ja palmupohjaisten raaka-aineiden seoksista palmuraaka-aineiden määrillä 10, 20 ja 30 m- %:a. Parafiinin ja palmusteariinin sekä palmun mid-fraktion seokset valmistettiin palmuraaka-aineiden osuuksilla 10, 20, 40 ja 50 m- %:a ja myös palmusteariinin soft-fraktiolla kokeiltiin seosta 50 m- %:lla. Steariinin ja palmupohjaisten raaka-aineiden seokset eivät toimineet ainakaan käytetyillä sydänlangoilla. Liekinkorkeudet olivat alhaisia eivätkä visuaaliset vaatimukset täyttyneet. Parafiinin ja palmupohjaisten raaka-aineiden seoksista valmistetut kynttilät paloivat ideaalisesti palmuraaka-aineiden osuuksilla 35 – 50 m- %:a. Tulosten perusteella fraktion valinnalla ei näyttänyt olevan merkitystä, mutta palmusteariini on ominaisuuksiensa puolesta kynttilänvalmistukseen soveltuvin. Liekinkorkeus ja palovuo laskivat lineaarisesti palmuraaka-aineen osuuden kasvaessa parafiinikynttilässä.