Pub Date : 2023-06-27DOI: 10.55713/jmmm.v33i2.1696
P. Nuchuay, C. Laongwan, W. Promcham, P. Somboonsaksri, S. Kalasung, C. Chananonnawathorn, P. Eiamchai, V. Patthanasettakul, C. Promjantuk, K. Seawsakul, N. Nuntawong, M. Horprathumb, S. Limwichean
The transparent conductive oxide (TCO) which is AZO thin film was prepared by controlling pulse frequency at 100 Hz to 900 Hz using high-power impulse magnetron sputtering (HiPIMS). All samples were deposited on silicon (100) and glass slide substrates which the thickness was kept constant at 400 nm. The surface morphology was investigated by field-emission scanning electron microscope (FE-SEM), crystallinity by Grazing Incidence X-ray Diffraction (GI-XRD), optical transparency by UV-Vis-NIR spectrophotometry, and electrical properties using Hall effect instrument. It was found that the AZO films exhibited dense columnar structure. The GI-XRD patterns of AZO films demonstrated the crystal growth direction which was preferred the hexagonal wurtzite structure at (002) and (103) planes. The AZO film prepared by using 700 Hz of frequency (duty cycle 7%) showed the average visible transmittance (Tavg) at 82% in the visible region (380 nm to 780 nm). Additionally, the resistivity, high mobility and carrier concentration of AZO film were found to be 3.0 × 10-3 Ω.cm-1, 10.53 cm2∙Vs-1 and 1.82 × 1020∙cm-3, respectively. The fabrication of AZO film presented excellent electrical and optical properties which could be applied in several optoelectronic applications.
{"title":"A study of the electrical and optical properties of AZO thin film by controlling pulse frequency of HiPIMS","authors":"P. Nuchuay, C. Laongwan, W. Promcham, P. Somboonsaksri, S. Kalasung, C. Chananonnawathorn, P. Eiamchai, V. Patthanasettakul, C. Promjantuk, K. Seawsakul, N. Nuntawong, M. Horprathumb, S. Limwichean","doi":"10.55713/jmmm.v33i2.1696","DOIUrl":"https://doi.org/10.55713/jmmm.v33i2.1696","url":null,"abstract":"The transparent conductive oxide (TCO) which is AZO thin film was prepared by controlling pulse frequency at 100 Hz to 900 Hz using high-power impulse magnetron sputtering (HiPIMS). All samples were deposited on silicon (100) and glass slide substrates which the thickness was kept constant at 400 nm. The surface morphology was investigated by field-emission scanning electron microscope (FE-SEM), crystallinity by Grazing Incidence X-ray Diffraction (GI-XRD), optical transparency by UV-Vis-NIR spectrophotometry, and electrical properties using Hall effect instrument. It was found that the AZO films exhibited dense columnar structure. The GI-XRD patterns of AZO films demonstrated the crystal growth direction which was preferred the hexagonal wurtzite structure at (002) and (103) planes. The AZO film prepared by using 700 Hz of frequency (duty cycle 7%) showed the average visible transmittance (Tavg) at 82% in the visible region (380 nm to 780 nm). Additionally, the resistivity, high mobility and carrier concentration of AZO film were found to be 3.0 × 10-3 Ω.cm-1, 10.53 cm2∙Vs-1 and 1.82 × 1020∙cm-3, respectively. The fabrication of AZO film presented excellent electrical and optical properties which could be applied in several optoelectronic applications.\u0000 ","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"5 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77395624","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}
Pub Date : 2023-06-27DOI: 10.55713/jmmm.v33i2.1653
P. Preechaburana, Somsak Sangnuy, S. Amloy
In this research, we have developed a colorimetric paper-based sensing platform for the determination of mercury ion (Hg2+) using gold nanoparticles (AuNPs). To evaluate the selectivity in the response to a special target, urea is used as recognizing ligands on AuNPs for selective sensing Hg2+. Colorimetric readings in the presence of various environmentally relevant metal ions, such as Na+, K+, Zn2+, Pb2+, and Hg2+, were also studied. The results show that amongst all the tested metal ions, the SPR peaks are located at 525 nm except in the case of the present of Hg2+, in which is red shifted to 537 nm. Furthermore, a new broad peak is observed at the wavelength of 695 nm corresponding to the color change from red to purple. The relations of the ratios of maximum absorbance at 695 nm and 537 nm, and the concentration of Hg2+ illustrate the linear behavior with the sensitivity of 2.0 × 10-5 nM-1 and the detection limit of 30 nM. The modified AuNPs with urea are applied on the paper-based device for quantitative Hg2+ detection with smartphone digital imaging. The intensity ratios between blue and red colors are linear-dependence relations which can be used to determine the concentration of Hg2+.
{"title":"Paper-based colorimetric sensor for mercury ion detection using smartphone digital imaging","authors":"P. Preechaburana, Somsak Sangnuy, S. Amloy","doi":"10.55713/jmmm.v33i2.1653","DOIUrl":"https://doi.org/10.55713/jmmm.v33i2.1653","url":null,"abstract":"In this research, we have developed a colorimetric paper-based sensing platform for the determination of mercury ion (Hg2+) using gold nanoparticles (AuNPs). To evaluate the selectivity in the response to a special target, urea is used as recognizing ligands on AuNPs for selective sensing Hg2+. Colorimetric readings in the presence of various environmentally relevant metal ions, such as Na+, K+, Zn2+, Pb2+, and Hg2+, were also studied. The results show that amongst all the tested metal ions, the SPR peaks are located at 525 nm except in the case of the present of Hg2+, in which is red shifted to 537 nm. Furthermore, a new broad peak is observed at the wavelength of 695 nm corresponding to the color change from red to purple. The relations of the ratios of maximum absorbance at 695 nm and 537 nm, and the concentration of Hg2+ illustrate the linear behavior with the sensitivity of 2.0 × 10-5 nM-1 and the detection limit of 30 nM. The modified AuNPs with urea are applied on the paper-based device for quantitative Hg2+ detection with smartphone digital imaging. The intensity ratios between blue and red colors are linear-dependence relations which can be used to determine the concentration of Hg2+.\u0000 ","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"30 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73486537","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}
Pub Date : 2023-06-27DOI: 10.55713/jmmm.v33i2.1582
Thammaporn Thublaor, Padungaut Srihathai, P. Wiman, Angkana Muengjai, S. Chandra-Ambhorn
AISI 430 ferritic stainless steel is a promising candidate for utilising as interconnects of solid oxide fuel cells due to its cost effectiveness and durability. Many methods for applying coating on steel substrates have been developed in order to decrease the degradation of steel due to oxidation rate and chromium volatile problems. Manganese-cobalt spinel exhibits high conductivity, thermal expansion compatible with ferritic stainless steels, and forms a barrier to inhibit chromium migration during oxidation. Copper can be added to manganese-cobalt spinel to improve electrical conductivity of the spinel coating. This work investigated oxide scale formation and oxidation rate of Mn-Co and Mn-Co-Cu coated samples in comparison with uncoated steel. The coated samples were prepared on the AISI 430 ferritic stainless steel using the electrodeposition technique. The oxidation rate was tested at 800℃ in Ar-20% CO2-5% H2O for 96 h. The results showed that both Mn-Co and Mn-Co-Cu coated samples could be formed continuous oxide layers. The SEM image showed a chromium oxide layer under the manganese-cobalt coating layer. The oxidation rate of the samples coated with Mn-Co spinel and Mn-Co-Cu spinel was lower than that of the uncoated steel.
{"title":"Oxidation behaviour of Mn-Co spinel coating on AISI 430 ferritic stainless steel with and without Cu in Ar-CO2-H2O atmosphere","authors":"Thammaporn Thublaor, Padungaut Srihathai, P. Wiman, Angkana Muengjai, S. Chandra-Ambhorn","doi":"10.55713/jmmm.v33i2.1582","DOIUrl":"https://doi.org/10.55713/jmmm.v33i2.1582","url":null,"abstract":"AISI 430 ferritic stainless steel is a promising candidate for utilising as interconnects of solid oxide fuel cells due to its cost effectiveness and durability. Many methods for applying coating on steel substrates have been developed in order to decrease the degradation of steel due to oxidation rate and chromium volatile problems. Manganese-cobalt spinel exhibits high conductivity, thermal expansion compatible with ferritic stainless steels, and forms a barrier to inhibit chromium migration during oxidation. Copper can be added to manganese-cobalt spinel to improve electrical conductivity of the spinel coating. This work investigated oxide scale formation and oxidation rate of Mn-Co and Mn-Co-Cu coated samples in comparison with uncoated steel. The coated samples were prepared on the AISI 430 ferritic stainless steel using the electrodeposition technique. The oxidation rate was tested at 800℃ in Ar-20% CO2-5% H2O for 96 h. The results showed that both Mn-Co and Mn-Co-Cu coated samples could be formed continuous oxide layers. The SEM image showed a chromium oxide layer under the manganese-cobalt coating layer. The oxidation rate of the samples coated with Mn-Co spinel and Mn-Co-Cu spinel was lower than that of the uncoated steel.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"15 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84325708","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}
Nowadays, there is a rise in the production of eco-friendly, value-added textiles from natural substances. Some plant extracts can simultaneously dye and impart functionalities to textile fibers. The main goal of this study was the development of anti-UV and antibacterial hemp fabrics through dyeing with aqueous extracts obtained from Diospyros mollis Griff. Fruits without using any hazardous chemicals. Response surface methodology (RSM) was used to optimize the dyeing process and evaluate parameter interactions. The optimal pH, dyeing concentration, dyeing temperature, and mordant concentration were 4, 200 %owf, 92°C, and 5.4 %owf, respectively. The dyed fabrics were evaluated for coloration properties (color strength and fastness properties) as well as functional properties (ultraviolet protection factor (UPF) and antibacterial activity).The resulting fabrics appeared black, and displayed satisfactory color strength along with satisfactory color fastness (ratings > 4). The dyed fabrics exhibited good antibacterial activity against both S.aureus and E.coli (bacterial colony reduction > 90%), however it was more pronounced against E.coli. The UPF of the dyed fabrics also achieved the maximum (40+) level, highlighting the excellent UV shielding property. Thus, Diospyros mollis Griff. fruit extract could be a new source of a natural black dye and functionalization agents for UV-protective and antimicrobial textile applications.
{"title":"Green production of simultaneous coloration and functional finishing on hemp textiles through dyeing with Diospyros mollis Griff. extract","authors":"Pisutsaran Chitichotpanya, Nattaya Vuthiganond, Pimnara Chutasen, Thitirat Inprasit","doi":"10.55713/jmmm.v33i2.1697","DOIUrl":"https://doi.org/10.55713/jmmm.v33i2.1697","url":null,"abstract":"Nowadays, there is a rise in the production of eco-friendly, value-added textiles from natural substances. Some plant extracts can simultaneously dye and impart functionalities to textile fibers. The main goal of this study was the development of anti-UV and antibacterial hemp fabrics through dyeing with aqueous extracts obtained from Diospyros mollis Griff. Fruits without using any hazardous chemicals. Response surface methodology (RSM) was used to optimize the dyeing process and evaluate parameter interactions. The optimal pH, dyeing concentration, dyeing temperature, and mordant concentration were 4, 200 %owf, 92°C, and 5.4 %owf, respectively. The dyed fabrics were evaluated for coloration properties (color strength and fastness properties) as well as functional properties (ultraviolet protection factor (UPF) and antibacterial activity).The resulting fabrics appeared black, and displayed satisfactory color strength along with satisfactory color fastness (ratings > 4). The dyed fabrics exhibited good antibacterial activity against both S.aureus and E.coli (bacterial colony reduction > 90%), however it was more pronounced against E.coli. The UPF of the dyed fabrics also achieved the maximum (40+) level, highlighting the excellent UV shielding property. Thus, Diospyros mollis Griff. fruit extract could be a new source of a natural black dye and functionalization agents for UV-protective and antimicrobial textile applications.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"11 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89105996","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1593
N. Yongvanich, Peerapat Soysom, Worachet Ratkasemsak
ZrSiO4-based pigments have been known to be very stable in ceramic glazes but require a high firing temperature required for phase formation. This study examined the feasibility of using rice husk waste as a substitute for crystalline SiO2. The amorphous form of silica with some impurities was obtained by calcining the rice husk at 800℃. The general chemical formula were (Zr0.9M0.1)SiO4, where M = V, Pr, Fe and Cr. The solid-state processing was achieved by firing at 1300℃ for 12 h with NaF (5 wt%). X-ray Diffraction revealed a lower relative fraction between ZrO2 (secondary phase) and ZrSiO4 in the RHA systems compared to the oxide system for all dopants. Amorphousness of RHA did help enhance phase formability. The particle sizes were in the 3 µm to 5 µm range. Elemental analysis revealed some areas with intense signals of zirconium, indicating unreacted ZrO2 particles. Colorations appeared to be blue, yellow, brown and green for dopants of V, Pr, Fe and Cr, respectively. Technological performance was tested in a practical ceramic glaze and frequently used raw materials fired at its maturation point. The results of this study hold huge potential for using rice husks for sustainable manufacturing of pigments as green products.
{"title":"Synthesis of zircon pigments from rice husk ash and their performance in ceramic glaze","authors":"N. Yongvanich, Peerapat Soysom, Worachet Ratkasemsak","doi":"10.55713/jmmm.v33i1.1593","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1593","url":null,"abstract":"ZrSiO4-based pigments have been known to be very stable in ceramic glazes but require a high firing temperature required for phase formation. This study examined the feasibility of using rice husk waste as a substitute for crystalline SiO2. The amorphous form of silica with some impurities was obtained by calcining the rice husk at 800℃. The general chemical formula were (Zr0.9M0.1)SiO4, where M = V, Pr, Fe and Cr. The solid-state processing was achieved by firing at 1300℃ for 12 h with NaF (5 wt%). X-ray Diffraction revealed a lower relative fraction between ZrO2 (secondary phase) and ZrSiO4 in the RHA systems compared to the oxide system for all dopants. Amorphousness of RHA did help enhance phase formability. The particle sizes were in the 3 µm to 5 µm range. Elemental analysis revealed some areas with intense signals of zirconium, indicating unreacted ZrO2 particles. Colorations appeared to be blue, yellow, brown and green for dopants of V, Pr, Fe and Cr, respectively. Technological performance was tested in a practical ceramic glaze and frequently used raw materials fired at its maturation point. The results of this study hold huge potential for using rice husks for sustainable manufacturing of pigments as green products.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"70 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78262795","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1597
Sophanat Khenthaphak, P. Juleang, W. Wonsawat, O. Chailapakul, Eakkasit Punrat
A method for methanol detection by an inexpensive device using a nanomaterial modified by N-methylpolypyrrole (NMPPY) has been developed. Manganese-doped zinc sulfide quantum dots (Mn/ZnS-QDs) were synthesized and then characterized by a fluorescence spectrophotometer to study their spectroscopic properties. Mn/ZnS-QDs were modified with NMPPy and studied by digital-image colorimetry to optimize conditions for methanol detection. A 2 mL of 3000 mg∙L–1 Mn/ZnS-QDs modified with 300 μL of 1000 mg∙L-1 of NMPPy was chosen to be a detecting reagent for methanol determination. Under the optimum conditions, the linear range was found to be 2%v/v to 50%v/v of methanol with R-square of 0.9434 and the sensitivity of 3.569 ´ 10–3 (%v/v)-1, whilst the limit of detection (LOD) was 19.5%v/v. The selectivity of this method was also studied with several solvents; it was proven selective for methanol. Furthermore, a prototype device with simple and inexpensive has been created. The analytical performances were studied; the linearity of methanol detection was found in the range of 20%v/v to 80%v/v with R-square of 0.9918 and the sensitivity of 3.38 ´ 10-3 (%v/v)-1. Finally, the newly developed device was applied to analyze samples of hand sanitizer gel by digital-image colorimetry with acceptable results.
{"title":"Development of inexpensive device for methanol detection in hand sanitizer gel using manganese-doped zinc sulfide quantum dots modified by N-methylpolypyrrole","authors":"Sophanat Khenthaphak, P. Juleang, W. Wonsawat, O. Chailapakul, Eakkasit Punrat","doi":"10.55713/jmmm.v33i1.1597","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1597","url":null,"abstract":"A method for methanol detection by an inexpensive device using a nanomaterial modified by N-methylpolypyrrole (NMPPY) has been developed. Manganese-doped zinc sulfide quantum dots (Mn/ZnS-QDs) were synthesized and then characterized by a fluorescence spectrophotometer to study their spectroscopic properties. Mn/ZnS-QDs were modified with NMPPy and studied by digital-image colorimetry to optimize conditions for methanol detection. A 2 mL of 3000 mg∙L–1 Mn/ZnS-QDs modified with 300 μL of 1000 mg∙L-1 of NMPPy was chosen to be a detecting reagent for methanol determination. Under the optimum conditions, the linear range was found to be 2%v/v to 50%v/v of methanol with R-square of 0.9434 and the sensitivity of 3.569 ´ 10–3 (%v/v)-1, whilst the limit of detection (LOD) was 19.5%v/v. The selectivity of this method was also studied with several solvents; it was proven selective for methanol. Furthermore, a prototype device with simple and inexpensive has been created. The analytical performances were studied; the linearity of methanol detection was found in the range of 20%v/v to 80%v/v with R-square of 0.9918 and the sensitivity of 3.38 ´ 10-3 (%v/v)-1. Finally, the newly developed device was applied to analyze samples of hand sanitizer gel by digital-image colorimetry with acceptable results.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"35 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76612432","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1651
Beatriz Dantas Lourenço da Silva, Paula Lage Agrize, Betina Carvalho Veiga, L. Nascimento, Camila Aparecida Abelha Rocha, Fábio de Oliveira Braga
One of the most frequent problems in biocomposites is the physical/chemical incompatibility between natural lignocellulosic fibers (NLF) and the matrix. Physical and/or chemical treatments are the most common approach to improve interface properties. Seeking for environmentally friendly treatments, lignosulfonates (LSs) have been considered for surface modification of NLF due to their amphiphilic properties. Thus, the objective of the present work is to evaluate the influence of sodium LS (SLS) treatment protocols in the properties and mechanical behavior of fique (Furcraea Andina) fibers. X-ray diffraction (XRD), Thermogravimetric (TGA) and spectroscopic (FTIR) analyzes were performed, as well as optical microscopy, scanning electron microscopy (SEM), fiber-diameter measurements and tensile tests. The results showed efficient surface cleaning from extractives and absorption of saline and aromatic components from SLS. Partial removal of lignin and hemicellulose was observed as well, manifested by an increasing in fiber crystallinity, decreasing in the intensity of the characteristic bands of C=O (acetyl and ester) and p-hydroxy-phenyl, and displacement in the temperature of cellulose pyrolysis to lower temperatures. These phenomena were stronger in the fibers with longer exposures to SLS. The SLS treatment protocols produce a narrower strength distribution, improving the reliability of the fibers relative to its mechanical behavior.
{"title":"Mechanical behavior and physicochemical modifications in lignosulfonate-treated fique (Furcraea Andina) fibers","authors":"Beatriz Dantas Lourenço da Silva, Paula Lage Agrize, Betina Carvalho Veiga, L. Nascimento, Camila Aparecida Abelha Rocha, Fábio de Oliveira Braga","doi":"10.55713/jmmm.v33i1.1651","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1651","url":null,"abstract":"One of the most frequent problems in biocomposites is the physical/chemical incompatibility between natural lignocellulosic fibers (NLF) and the matrix. Physical and/or chemical treatments are the most common approach to improve interface properties. Seeking for environmentally friendly treatments, lignosulfonates (LSs) have been considered for surface modification of NLF due to their amphiphilic properties. Thus, the objective of the present work is to evaluate the influence of sodium LS (SLS) treatment protocols in the properties and mechanical behavior of fique (Furcraea Andina) fibers. X-ray diffraction (XRD), Thermogravimetric (TGA) and spectroscopic (FTIR) analyzes were performed, as well as optical microscopy, scanning electron microscopy (SEM), fiber-diameter measurements and tensile tests. The results showed efficient surface cleaning from extractives and absorption of saline and aromatic components from SLS. Partial removal of lignin and hemicellulose was observed as well, manifested by an increasing in fiber crystallinity, decreasing in the intensity of the characteristic bands of C=O (acetyl and ester) and p-hydroxy-phenyl, and displacement in the temperature of cellulose pyrolysis to lower temperatures. These phenomena were stronger in the fibers with longer exposures to SLS. The SLS treatment protocols produce a narrower strength distribution, improving the reliability of the fibers relative to its mechanical behavior.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"6 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74395377","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1616
O. Togibasa, K. Dahlan, Y. Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani
In this paper, we analyzed the effect of surface modification on the surface properties of the active carbon from sago waste using varied oxidizers, namely H2O2, HNO3, and H2SO4. The ordinary active carbon has an initial surface area of 546.6 m2∙g-1, with a phenol and carboxylic functional group. The porosity, functional groups and morphological surface, together with the chemical composition of activated carbon were examined using a nitrogen adsorption-desorption through the Brunauer Emmett Teller (BET) method and the calculation of Barret-Joyner-Hall (BJH), a Fourier-transformed infrared spectroscopy, and a scanning electron microscopy with energy dispersive spectroscopy. The results found that the modified activated carbon significantly increased surface area and total pore volume. Activated carbon modified using H2SO4 oxidizers has the highest surface area value of 853.6 m2∙g-1 and a total pore volume value of 0.585 cm3∙g-1. In addition, the surface modification has changed carbon's porosity from micropore to mesopore, altered the surface functional group from phenol to ether. The surface modification has improved its adsorption capacity and potentially further its application. In conclusion, modifying the surface could make the properties closer to the standards for commercial activated carbon.
{"title":"Surface modification of activated carbon from sago waste","authors":"O. Togibasa, K. Dahlan, Y. Ansanay, Alda Filadelfi Runggaweri, Marlifon Merani","doi":"10.55713/jmmm.v33i1.1616","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1616","url":null,"abstract":"In this paper, we analyzed the effect of surface modification on the surface properties of the active carbon from sago waste using varied oxidizers, namely H2O2, HNO3, and H2SO4. The ordinary active carbon has an initial surface area of 546.6 m2∙g-1, with a phenol and carboxylic functional group. The porosity, functional groups and morphological surface, together with the chemical composition of activated carbon were examined using a nitrogen adsorption-desorption through the Brunauer Emmett Teller (BET) method and the calculation of Barret-Joyner-Hall (BJH), a Fourier-transformed infrared spectroscopy, and a scanning electron microscopy with energy dispersive spectroscopy. The results found that the modified activated carbon significantly increased surface area and total pore volume. Activated carbon modified using H2SO4 oxidizers has the highest surface area value of 853.6 m2∙g-1 and a total pore volume value of 0.585 cm3∙g-1. In addition, the surface modification has changed carbon's porosity from micropore to mesopore, altered the surface functional group from phenol to ether. The surface modification has improved its adsorption capacity and potentially further its application. In conclusion, modifying the surface could make the properties closer to the standards for commercial activated carbon.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"87 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85486348","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1577
Seksan Singthanu, P. Surin, T. Nilsonthi, Manop Pipatthattakul
In the hot-rolling process, steel was subjected to high temperatures which results in the formation of an oxide layer called scale. The oxide scale can be affected to the surface characteristic of the hot-rolled steel product. The scale must be completely removed from the surface of the steel before further processing. This research aimed to examine the adhesion behavior of scale on hot-rolled steel with different silicon contents (0.01, 0.12, 0.18, and 0.29 wt%) using a tensile testing machine with an observation setup. The results showed that the scale thickness decreased with increasing silicon content in the range of 9 µm to 12 µm. The scales were composed of hematite and magnetite. The results of the tensile test showed that the strain initiating the first spallation and the mechanical adhesion energy tend to increase with increasing silicon content. However, it decreased by 0.29 wt% Si hot-rolled steel. This result indicates that scale was difficult to remove after the hot rolling process for higher Si-containing steel.
{"title":"Examination of the adhesion of the scale formed on hot-rolled steel with different silicon content using a tensile test","authors":"Seksan Singthanu, P. Surin, T. Nilsonthi, Manop Pipatthattakul","doi":"10.55713/jmmm.v33i1.1577","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1577","url":null,"abstract":"In the hot-rolling process, steel was subjected to high temperatures which results in the formation of an oxide layer called scale. The oxide scale can be affected to the surface characteristic of the hot-rolled steel product. The scale must be completely removed from the surface of the steel before further processing. This research aimed to examine the adhesion behavior of scale on hot-rolled steel with different silicon contents (0.01, 0.12, 0.18, and 0.29 wt%) using a tensile testing machine with an observation setup. The results showed that the scale thickness decreased with increasing silicon content in the range of 9 µm to 12 µm. The scales were composed of hematite and magnetite. The results of the tensile test showed that the strain initiating the first spallation and the mechanical adhesion energy tend to increase with increasing silicon content. However, it decreased by 0.29 wt% Si hot-rolled steel. This result indicates that scale was difficult to remove after the hot rolling process for higher Si-containing steel. ","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"89 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80994357","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}
Pub Date : 2023-03-28DOI: 10.55713/jmmm.v33i1.1595
Samar S. Hussein, Abeer A. Radhi, W. Mahmood
In the present work, commercial tin-plate used as storage cans for three different products (salmon fish, green peas, and corn) are used to investigate the corrosion to storage temperature and salt concentration. The corrosion process was electrochemically monitored using the potentiodynamic polarization method and the structure and concentrations of the corrosion products were investigated using X-ray diffraction (XRD). To characterize the resulting sample morphology, emission scanning electron microscopy (FESEM) was used. The results showed that the corrosion resistance of the tin-coating, was important constant and by changing the NaCl concentration and operation temperature, the corrosion resistance was lower. It is believed that the steel substrate dissolution that is underneath the tin coating is the main driving force for the investigated corrosion process. The experimental results show that the operating temperature has a higher impact on the corrosion rate because it promotes a heavy tendency on the rate of diffusion of molecules or ions in a solution. Green peas tin-plates are corroded more than corn, and salmon fish tin-plates when the temperature was increased from 25℃ to 50℃ and showed higher negative corrosion potential and higher corrosion current density in sodium chloride solutions.
{"title":"Investigating the effect of temperature and NaCl concentration on corrosion behavior using commercial food cans","authors":"Samar S. Hussein, Abeer A. Radhi, W. Mahmood","doi":"10.55713/jmmm.v33i1.1595","DOIUrl":"https://doi.org/10.55713/jmmm.v33i1.1595","url":null,"abstract":"In the present work, commercial tin-plate used as storage cans for three different products (salmon fish, green peas, and corn) are used to investigate the corrosion to storage temperature and salt concentration. The corrosion process was electrochemically monitored using the potentiodynamic polarization method and the structure and concentrations of the corrosion products were investigated using X-ray diffraction (XRD). To characterize the resulting sample morphology, emission scanning electron microscopy (FESEM) was used. The results showed that the corrosion resistance of the tin-coating, was important constant and by changing the NaCl concentration and operation temperature, the corrosion resistance was lower. It is believed that the steel substrate dissolution that is underneath the tin coating is the main driving force for the investigated corrosion process. The experimental results show that the operating temperature has a higher impact on the corrosion rate because it promotes a heavy tendency on the rate of diffusion of molecules or ions in a solution. Green peas tin-plates are corroded more than corn, and salmon fish tin-plates when the temperature was increased from 25℃ to 50℃ and showed higher negative corrosion potential and higher corrosion current density in sodium chloride solutions.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":"27 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82084121","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}
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