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Porous Cordierite Ceramics from Natural Clays / Poraina kordierīta keramika no dabiskiem māliem
Materials Science and Applied Chemistry Pub Date : 2015-01-01 DOI: 10.1515/msac-2015-0006
M. Rundans, I. Šperberga
{"title":"Porous Cordierite Ceramics from Natural Clays / Poraina kordierīta keramika no dabiskiem māliem","authors":"M. Rundans, I. Šperberga","doi":"10.1515/msac-2015-0006","DOIUrl":"https://doi.org/10.1515/msac-2015-0006","url":null,"abstract":"Abstract In this report the obtaining and properties of hightemperature porous ceramic materials using local carbonate clays and quartz sand resources was studied. Materials with two different porosities were obtained by using different synthesis temperatures. The test results show that these materials contain cordierite as their main crystalline phase. The porosity directly influences the compressive strength and it is greatly reduced when overall porosity increases. The CTE of obtained materials is low − about 3-10−6 1/°C. Keramikas materiāliem, kas veidoti sistēmā MgO-Al2O3-SiO2 ir plašs pielietojums dažādās jomās. Tā tas, piemēram, ir termiski stabilajai fāzei kordierītam (2MgO·2Al2O3·5SiO2). Kordierīta keramika ar tās zemo termiskās izplešanās koeficientu - TIK (α ≈ 1,0·10−6 -4,0·10−6 1/°C) droši iztur straujas temperatūras izmaiņas, tāpēc tā var tikt izmantota kā ugunsizturīgs materiāls. Dabā kordierīts ir reti sastopams minerāls, tādēļ šis kristāliskais materiāls ir jāiegūst sintētiski. Visplašāk izmantotā metode ir augsttemperatūras cietfāžu sintēze, retāk - sola-gēla sintēze un rekristalizācija no stiklveida kausējuma. Sintēzei tiek izmantotas dažādas magnija, alumīnija un silīcija oksīdus saturošas izejvielas, no kurām visbiežāk lietotās ir talks un kaolīns. Lai samazinātu nepieciešamo sintēzes temperatūru, oksīda maisījumiem tiek pievienoti dažādi kušņi, piemēram, B2O3. Šajā pētījumā ieguva augsti porainus kordierīta keramiskos materiālus, izmantojot vietējās izejvielas - karbonātu mālu un kvarca smiltis. Ieguva dažādas porainības materiālus, mainot sintēzes temperatūru. Rentgenfāžu analīzes rezultāti liecināja, ka šie materiāli saturēja kordierītu kā galveno kristālisko fāzi. Porainībai palielinoties, tā tieši ietekmēja spiedes stiprību, to ievērojami samazinot. Iegūto materiālu termiskās izplešanās koeficienti bija zemi (ne augstāki par 3,0·10−6 1/°C visā pētītajā temperatūras diapazonā), neskatoties uz poru un stiklveida fāzes klātbūtni.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"11 1","pages":"33 - 38"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81327037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Studies on the Development of Hybrid Agrofibre Reinforced Biocomposites 混杂农业纤维增强生物复合材料的发展研究
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.003
A. Dzene, V. Tupureina, M. Dzenis
{"title":"Studies on the Development of Hybrid Agrofibre Reinforced Biocomposites","authors":"A. Dzene, V. Tupureina, M. Dzenis","doi":"10.7250/MSAC.2014.003","DOIUrl":"https://doi.org/10.7250/MSAC.2014.003","url":null,"abstract":"The main goal of the presented study is the development of two agrofibres – hemp/flax and hemp/hemp shive reinforced hybrid biocomposites based on waterborne polymer matrix system – blends of biodegradable polyhydroxybutyrate (PHB) and poly(vinyl alcohol) (PVA). The correlation between agrofibre ratio and mechanical characteristics of hybrid agrofibre reinforced biocomposites has been established. The positive hybrid effect and optimal results in terms of mechanical strength of hemp/flax biocomposites have been found in 4:1 ratio. The elaborated hybrid biocomposites are considered biodegradable in soil, their mass loss is found to be ≥ 52 % … 54 % from initial mass during 5 months.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"1 1","pages":"18-21"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77784815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Providing Quality of Shredded Carrots during Storage by Treatment with Ozonated Water 臭氧水处理对胡萝卜丝贮藏质量的影响
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.002
I. Augšpole, T. Rakčejeva, L. Dukaļska, L. Skudra
{"title":"Providing Quality of Shredded Carrots during Storage by Treatment with Ozonated Water","authors":"I. Augšpole, T. Rakčejeva, L. Dukaļska, L. Skudra","doi":"10.7250/MSAC.2014.002","DOIUrl":"https://doi.org/10.7250/MSAC.2014.002","url":null,"abstract":"The objective of the current research is to evaluate the quality changes of shredded carrots treated with 2 ppm ozonated tap water for 60 s ± 1 s. Treated carrots have been packed in several materials (hermetically sealed by breathing polymer film BOPP PropafilmTM P2GAF, cellulose based biodegradable NatureFlex NVS and Polilactid BIO-PLA Containers) and stored at the temperature of + 4 °C ± 1 °C for 10 days. Main quality parameters using standard methods have been analysed: total carotenoids and β-carotene, total phenolic, antioxidant capacity, soluble solids, mass loses, moisture, pH, firmness, colour, CO2 and O2 and microbiological parameters. Testing of the samples has been carried out before packaging and during storage. In the present research it has been proved that is possible to maintain the chemical composition of shredded carrots during storage by treatment of carrots with ozonated tap water; as a result, the shelf-life of shredded carrots can prolong till 10 days.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"29 1","pages":"10-17"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91098371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Membrane Extraction of Chromium(VI) by Tri-n-Octylamine during Electrodialysis 电渗析过程中三正辛胺膜萃取铬(VI)
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.007
T. Sadyrbaeva
{"title":"Membrane Extraction of Chromium(VI) by Tri-n-Octylamine during Electrodialysis","authors":"T. Sadyrbaeva","doi":"10.7250/MSAC.2014.007","DOIUrl":"https://doi.org/10.7250/MSAC.2014.007","url":null,"abstract":"A new process for chromium(VI) removal from aqueous solutions is presented. The process includes the transport of chromium(VI) anionic complexes from chloride acidic solutions through bulk liquid membranes at galvanostatic electrodialysis. Solutions of tri-n-octylamine with admixtures of di(2-ethylhexyl)phosphoric acid in 1,2-dichloroethane have been used as the liquid membranes. Effects of current density, chromium(VI) and acid concentration in the feed solution, carrier and admixture concentration in the liquid membrane,  type of acid in the stripping solution are studied, and optimum conditions are determined. Practically complete removal of chromium(VI) from the feed solution containing 0.01 mol/L  K 2 Cr 2 O 7 is achieved during 1.0 − 4.0 hours of electrodialysis. Maximum stripping degree of ~ 90 % is obtained under optimum conditions. A possibility of effective single-stage removal of chromium(VI) into dilute solutions of hydrochloric, sulphuric, perchloric, phosphoric acids and water is demonstrated.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"4 1","pages":"39-44"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83822083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Studies of the Relationship between Morphology and Pozzolanic Activity of Different Micro Fillers for HPC 高性能混凝土微填料形态与火山灰活性关系的研究
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.005
L. Krāģe, D. Bajare, A. Korjakins, J. Sētiņa, I. Juhņeviča, I. Kiriloviča
{"title":"Studies of the Relationship between Morphology and Pozzolanic Activity of Different Micro Fillers for HPC","authors":"L. Krāģe, D. Bajare, A. Korjakins, J. Sētiņa, I. Juhņeviča, I. Kiriloviča","doi":"10.7250/MSAC.2014.005","DOIUrl":"https://doi.org/10.7250/MSAC.2014.005","url":null,"abstract":"The given research is devoted to the studies of morphology, particle size and pozzolanic activity of different supplementary cementing materials (SCM) – thermally treated clays as well as waste products – coal ash, waste glass powder, timber and barley ashes. Different properties of SCM have been analysed: specific surface area, surface morphology, particle size distribution, chemical composition and lime-combining capacity in the reaction with Ca(OH) 2 . The obtained results have indicated that micro additives with larger specific surface are more reactive.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"81 1","pages":"28-34"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86838368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and Antioxidant Properties of Novel Quinazoline Derivatives 新型喹唑啉衍生物的合成及其抗氧化性能
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.009
Z. Tetere, D. Zicāne, I. Rāviņa, I. Mieriņa, I. Rijkure
{"title":"Synthesis and Antioxidant Properties of Novel Quinazoline Derivatives","authors":"Z. Tetere, D. Zicāne, I. Rāviņa, I. Mieriņa, I. Rijkure","doi":"10.7250/MSAC.2014.009","DOIUrl":"https://doi.org/10.7250/MSAC.2014.009","url":null,"abstract":"Quinazoline derivatives have expressed a broad spectrum of biological activities, but there are few examples in literature on an antioxidant activity of different quinazolines. On the basis of literature by Chinese scientists on the effective antioxidant activity of Schiff bases containing 2-oxoquinoline and due to structural similarity of quinoline and quinazoline ring systems, the reactions of 3-aminoquinazolinone with a range of aromatic aldehydes and ethoxymethylene derivatives have been carried out and their radical scavenging activities have been studied.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"16 1","pages":"51-54"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89484393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Bioactive Compounds in Latvian Wild Berry Juice 拉脱维亚野生浆果汁中的生物活性化合物
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.001
I. Čakste, M. Kūka, I. Augšpole, I. Cinkmanis, Peteris Kuka
{"title":"Bioactive Compounds in Latvian Wild Berry Juice","authors":"I. Čakste, M. Kūka, I. Augšpole, I. Cinkmanis, Peteris Kuka","doi":"10.7250/MSAC.2014.001","DOIUrl":"https://doi.org/10.7250/MSAC.2014.001","url":null,"abstract":"Fructose is the dominant monosaccharide in bilberry juice and red bilberry juice, but glucose is dominant in the cranberry juice. Dominant polyphenols are catechine and chlorogenic acid. In the bilberry and red bilberry juices, the most common acids are citric, quinic and tartaric acids, in the cranberry juice – citric, quinic and malic acids. When bilberry juice is heat-treated for 30 min at 98 °C ± 1 °C, HMF content is 2-fold higher than in samples treated at 60 °C ± 1 °C. In solutions from lyophilisates of wild berry juice, turbidity and translucent coloration have been determined.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"12 1","pages":"5-9"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83478659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The Study of the Adhesive Activity and Modification Possibilities of Melamine-Urea-Formaldehyde (MUF), Urea-Formaldehyde (UF) Resins 三聚氰胺-脲醛(MUF)、脲醛(UF)树脂的粘接性能及改性可能性研究
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.006
J. Kajaks, A. Kolbins
{"title":"The Study of the Adhesive Activity and Modification Possibilities of Melamine-Urea-Formaldehyde (MUF), Urea-Formaldehyde (UF) Resins","authors":"J. Kajaks, A. Kolbins","doi":"10.7250/MSAC.2014.006","DOIUrl":"https://doi.org/10.7250/MSAC.2014.006","url":null,"abstract":"Two types of thermosetting resins MUF and UF have been used as glues for birch wood veneer. As resins modifiers polyvinylacetate emulsion (PVA), polyvinylbutiral (PVB) (powder and solution), rubber latex, adipic (Ad) and sebacic (Seb) acids have been utilized. For glued system shear strength and deformation, bending properties and impact strength have been tested. The best properties: adhesive activity and elasticity have been shown by resins modified with PVB powder, rubber latex, adipic and sebacic acids.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"19 1","pages":"35-38"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86535608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
The Effect of Chlorination on Escherichia Coli Viability in Drinking Water 氯化处理对饮用水中大肠杆菌活力的影响
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.008
V. Deņisova, L. Mezule, T. Juhna
{"title":"The Effect of Chlorination on Escherichia Coli Viability in Drinking Water","authors":"V. Deņisova, L. Mezule, T. Juhna","doi":"10.7250/MSAC.2014.008","DOIUrl":"https://doi.org/10.7250/MSAC.2014.008","url":null,"abstract":"The assessment of drinking water disinfection efficiency traditionally involves the estimation of faecal indicator inactivation rates in the form of reduction of cultivable counts. Widely described, viable but noncultivable (VBNC) state as a form of bacterial survival strategy in oligotrophic conditions is not considered in these estimations. The aim of the present research is to assess the effect of free chlorine disinfection on faecal indicator Escherichia coli in order to study the succession of cellular alterations in response to chlorine exposure. To determine the inactivation rates, cell ability to form colonies, ability to divide as such and metabolic activity have studied. 0.064 mg/L min -1 free chlorine has been needed to obtain 99 % inactivation of cultivable counts; however, 5 till 200 times higher disinfectant dose x contact time has been required to reduce cell ability to divide and metabolic activity, respectively. The results have shown that to determine correct drinking water disinfectant doses multiple cell viability parameters should be analyzed.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"7 1","pages":"45-50"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74958314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Synthesis of Micro- and Mesoporous SiO2 Based Ceramic Materials (Using Sol-gel Technology) 微孔和介孔SiO2基陶瓷材料的合成(采用溶胶-凝胶技术)
Materials Science and Applied Chemistry Pub Date : 2014-09-05 DOI: 10.7250/MSAC.2014.011
Margarita Karpe, G. Mežinskis
{"title":"Synthesis of Micro- and Mesoporous SiO2 Based Ceramic Materials (Using Sol-gel Technology)","authors":"Margarita Karpe, G. Mežinskis","doi":"10.7250/MSAC.2014.011","DOIUrl":"https://doi.org/10.7250/MSAC.2014.011","url":null,"abstract":"The aim of research is to develop an area of micro- and mesoporous ceramic materials of ternary - TiO 2 -ZrO 2 -SiO 2 system. Ceramic system TiO 2 -ZrO 2 -SiO 2 has been synthesized via a sol-gel technology by hydrolysis of tetraethylorthosilicate (TEOS) and zirconia propoxide and titanium isporopoxide solutions. The sols have been polymerized at room temperature to obtain gels and dried at 100 °C for 72 hours. Xerogel has been milled for 1 or 6 hours and axially pressed for nanoporous ceramic samples. Powders have been sintered at 800 °C or 1000 °C in air. 1 M hydrochloric acid and distilled water have been used as a catalyst to advance the hydrolysis and condensation reactions. All samples have been characterized by X-ray (XRD) diffraction, particle size distribution, crystallite size distribution, compressive strength. Porosity and specific surface area of nanoporous ceramic samples have been determined by Brunauer, Emmett and Teller (BET) nitrogen adsorption-desorption isotherms.","PeriodicalId":18239,"journal":{"name":"Materials Science and Applied Chemistry","volume":"113 1","pages":"63-68"},"PeriodicalIF":0.0,"publicationDate":"2014-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85343357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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