Pub Date : 2024-07-12DOI: 10.21924/cst.9.1.2024.1289
T. Yuwono, Mohd Hafiz Baharuddin, H. Zhivomirov, E. Wahyuni
The characterization of the EM emissions for electronic products is crucial to ensure that the emissions have met the requirements of the EMC standards. For this, a more comprehensive testing is required to get more meaningful results. While, the emergence of non-stationary emissions is a challenge to obtain valid analysis results. So far, non-stationary EM emissions is not considered and treated properly in the emission analysis. This paper presents a new method for the analysis of EM emissions from electronic devices as a case study by testing three different program modes (scenarios) of Intel Galileo board. These program modes were designed to vary processing intensity in its memory and processor. A comparison was also made between the actual situation (the presence of non-stationary signals) and the hypothetical situation with the assumption that all emissions were stationary. As a result, a significant difference was observed when the analysis considered the real scenario of a non-stationary emission. The ratio between the average autocorrelation using the proposed algorithm and the average correlation by ignoring the non-stationarity of the emission signal was 113.6 times. The study concludes that different program modes produce the different characteristics of EM emissions, making some of them non-stationary. Hence, we strongly suggest the consideration of the non-stationarity of the EM emissions in characterizing complex electronic devices.
{"title":"On the characterization of EM emission of electronic products: Case study for different program modes","authors":"T. Yuwono, Mohd Hafiz Baharuddin, H. Zhivomirov, E. Wahyuni","doi":"10.21924/cst.9.1.2024.1289","DOIUrl":"https://doi.org/10.21924/cst.9.1.2024.1289","url":null,"abstract":"The characterization of the EM emissions for electronic products is crucial to ensure that the emissions have met the requirements of the EMC standards. For this, a more comprehensive testing is required to get more meaningful results. While, the emergence of non-stationary emissions is a challenge to obtain valid analysis results. So far, non-stationary EM emissions is not considered and treated properly in the emission analysis. This paper presents a new method for the analysis of EM emissions from electronic devices as a case study by testing three different program modes (scenarios) of Intel Galileo board. These program modes were designed to vary processing intensity in its memory and processor. A comparison was also made between the actual situation (the presence of non-stationary signals) and the hypothetical situation with the assumption that all emissions were stationary. As a result, a significant difference was observed when the analysis considered the real scenario of a non-stationary emission. The ratio between the average autocorrelation using the proposed algorithm and the average correlation by ignoring the non-stationarity of the emission signal was 113.6 times. The study concludes that different program modes produce the different characteristics of EM emissions, making some of them non-stationary. Hence, we strongly suggest the consideration of the non-stationarity of the EM emissions in characterizing complex electronic devices.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834160","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 : 2024-07-12DOI: 10.21924/cst.9.1.2024.1368
Aulia Arham, Hanung Adi Nugroho
In recent years, reversible watermarking has emerged as a promising technique that safely embeds data in digital images without compromising their originality. This method is particularly useful for sensitive images such as military, art, and medical images, where each pixel contains important information requiring authentication. Researchers have been attempting to develop this method further to increase payload capacity while maintaining visual quality and low computational complexity. In this study, we developed a reversible watermarking with block-based optimization based on Reduced Difference Expansion (RDE) applied to 3×3 pixel blocks, allowing for the embedding of 8?bit data. Based on experimental results from tests conducted on 2 common images and 3 medical images, our method could consistently achieve a payload capacity of up to 0.8924 bpp with a PSNR of 41.077 dB while maintaining good visual quality across various image categories, outperforming previous approaches.
{"title":"Block-based optimization for enhancing reversible watermarking using reduce difference expansion","authors":"Aulia Arham, Hanung Adi Nugroho","doi":"10.21924/cst.9.1.2024.1368","DOIUrl":"https://doi.org/10.21924/cst.9.1.2024.1368","url":null,"abstract":"In recent years, reversible watermarking has emerged as a promising technique that safely embeds data in digital images without compromising their originality. This method is particularly useful for sensitive images such as military, art, and medical images, where each pixel contains important information requiring authentication. Researchers have been attempting to develop this method further to increase payload capacity while maintaining visual quality and low computational complexity. In this study, we developed a reversible watermarking with block-based optimization based on Reduced Difference Expansion (RDE) applied to 3×3 pixel blocks, allowing for the embedding of 8?bit data. Based on experimental results from tests conducted on 2 common images and 3 medical images, our method could consistently achieve a payload capacity of up to 0.8924 bpp with a PSNR of 41.077 dB while maintaining good visual quality across various image categories, outperforming previous approaches.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834338","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 : 2024-07-12DOI: 10.21924/cst.9.1.2024.1345
Romario Abdullah, Dinia Astira, Utari Zulfiani, Alvin Rahmad Widyanto, Zeni Rahmawati, T. Gunawan, Yuly Kusumawati, Mohd Hafiz Dzarfan Othman, H. Fansuri
Dye hurts the threat of human health problems and environmental pollution. Microcrystalline cellulose (MCC) based membrane is a good material to be used as an dye separation membrane for having the high hydrophilicity of the membrane. It has been successfully isolated from kapok (ceiba pentandra) with characteristic X-ray diffraction patterns and FTIR absorption peaks, which corresponded to the typical peaks of cellulose. The ultrafiltration membrane was made up of a cellulose acetate matrix created using the phase inversion method. Characterization results indicated that the inclusion of MCC derived from kapok led to a reduction in the contact angle from 65 to 52o, and an increase in membrane porosity from 82 to 85%. In the separation of dye, the composite membrane incorporating MCC filler demonstrated superior performance compared to the membrane lacking MCC, manifesting in an elevated water flux from 43 to 84 L/m².h and methylene blue (MB) rejection from 64 to 99%. The use of MCC as a filler in cellulose acetate membranes can enhance the characteristics and performance of the membrane in MB separation.
{"title":"Ultrafiltration membranes for dye wastewater treatment: Utilizing cellulose acetate and microcrystalline cellulose fillers from Ceiba Pentandra","authors":"Romario Abdullah, Dinia Astira, Utari Zulfiani, Alvin Rahmad Widyanto, Zeni Rahmawati, T. Gunawan, Yuly Kusumawati, Mohd Hafiz Dzarfan Othman, H. Fansuri","doi":"10.21924/cst.9.1.2024.1345","DOIUrl":"https://doi.org/10.21924/cst.9.1.2024.1345","url":null,"abstract":"Dye hurts the threat of human health problems and environmental pollution. Microcrystalline cellulose (MCC) based membrane is a good material to be used as an dye separation membrane for having the high hydrophilicity of the membrane. It has been successfully isolated from kapok (ceiba pentandra) with characteristic X-ray diffraction patterns and FTIR absorption peaks, which corresponded to the typical peaks of cellulose. The ultrafiltration membrane was made up of a cellulose acetate matrix created using the phase inversion method. Characterization results indicated that the inclusion of MCC derived from kapok led to a reduction in the contact angle from 65 to 52o, and an increase in membrane porosity from 82 to 85%. In the separation of dye, the composite membrane incorporating MCC filler demonstrated superior performance compared to the membrane lacking MCC, manifesting in an elevated water flux from 43 to 84 L/m².h and methylene blue (MB) rejection from 64 to 99%. The use of MCC as a filler in cellulose acetate membranes can enhance the characteristics and performance of the membrane in MB separation.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834507","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 : 2024-07-12DOI: 10.21924/cst.9.1.2024.1393
A. Kahfi, N. Kusumawati, P. Setiarso, S. Muslim, Sinta Anjas Cahyani, Nafisatus Zakiyah
Polyvinylidene Fluoride (PVDF) membranes were modified with quaternized graphene oxide (QGO) synthesized from graphene oxide and quaternized ammonium groups. PVDF/QGO membranes were created by blending PVDF and 0.01-0.05 g QGO via phase inversion. FTIR confirmed the successful QGO incorporation. PVDF/QGO membranes exhibited increased mechanical stiffness. Meanwhile, SEM revealed asymmetric morphology with surface and internal pores. AFM showed the membrane with 0.05 g and QGO had the highest surface roughness of 101.2 nm, which increased filtration area and flux. QGO improved hydrophilicity through hydroxyl and quaternary ammonium groups, enhancing water flux up to 1208 Lm?2h?1 for 0.05 g QGO. Cu2+ rejection increased to 75% for 0.05 g QGO membrane due to chelation and adsorption effects. PVDF/QGO membranes displayed bacterial growth inhibition, unlike pristine PVDF. The inhibition zone diameter increased with more QGO, indicating improved antibacterial activity. Overall, this study demonstrated that QGO improved PVDF membranes' hydrophilicity, antibacterial properties, and mechanical strength.
{"title":"Study in the impact of quaternized graphene oxide (QGO) composition as modifier on the chemical, physical, mechanical, and performance properties of polyvinylidene fluoride (PVDF)-based nanocomposite membrane","authors":"A. Kahfi, N. Kusumawati, P. Setiarso, S. Muslim, Sinta Anjas Cahyani, Nafisatus Zakiyah","doi":"10.21924/cst.9.1.2024.1393","DOIUrl":"https://doi.org/10.21924/cst.9.1.2024.1393","url":null,"abstract":"Polyvinylidene Fluoride (PVDF) membranes were modified with quaternized graphene oxide (QGO) synthesized from graphene oxide and quaternized ammonium groups. PVDF/QGO membranes were created by blending PVDF and 0.01-0.05 g QGO via phase inversion. FTIR confirmed the successful QGO incorporation. PVDF/QGO membranes exhibited increased mechanical stiffness. Meanwhile, SEM revealed asymmetric morphology with surface and internal pores. AFM showed the membrane with 0.05 g and QGO had the highest surface roughness of 101.2 nm, which increased filtration area and flux. QGO improved hydrophilicity through hydroxyl and quaternary ammonium groups, enhancing water flux up to 1208 Lm?2h?1 for 0.05 g QGO. Cu2+ rejection increased to 75% for 0.05 g QGO membrane due to chelation and adsorption effects. PVDF/QGO membranes displayed bacterial growth inhibition, unlike pristine PVDF. The inhibition zone diameter increased with more QGO, indicating improved antibacterial activity. Overall, this study demonstrated that QGO improved PVDF membranes' hydrophilicity, antibacterial properties, and mechanical strength.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141834354","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 : 2023-12-31DOI: 10.21924/cst.8.2.2023.1257
Ragiel Hadi Prayitno, Latifah, S. Sudiro, S. Madenda, Suryadi Harmanto
This article described the Advanced Encryption Standard (AES) encryption and decryption process without using lookup tables in the MixColumns transformation and parallelizing the transformation process implemented in the Field Programmable Gate Array (FPGA) hardware. Parallelism of the hardware process conducted to the transformation of key schedule, addroundkey, subbyte and shiftrows (subshift) and mixcolumns in the first 5 rounds of the encryption process. The decryption process was parallelized in subshift transformations, both transformations were implemented at the same time. This research produced a modified AES encryption and decryption method and algorithm with the aim of minimizing the resources required for hardware implementation. The method in this article was applied to Xilinx ISE 14.7 software. The experimental results showed that the encryption process required 2,357 slice LUT's, 845 occupied slices and 26 IOB's, while the decryption process required 2,896 LUT's, 1,323 occupied slices and 26 IOB's resources. The encryption and decryption processes each took an average of 2.891 nanoseconds and 3.467 nanoseconds for every 128 bits of data. This approach leads us to obtain a component with minimum resources and enough computational speed.
{"title":"A modified MixColumn-InversMixColumn in AES algorithm suitable for hardware implementation using FPGA device","authors":"Ragiel Hadi Prayitno, Latifah, S. Sudiro, S. Madenda, Suryadi Harmanto","doi":"10.21924/cst.8.2.2023.1257","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1257","url":null,"abstract":"This article described the Advanced Encryption Standard (AES) encryption and decryption process without using lookup tables in the MixColumns transformation and parallelizing the transformation process implemented in the Field Programmable Gate Array (FPGA) hardware. Parallelism of the hardware process conducted to the transformation of key schedule, addroundkey, subbyte and shiftrows (subshift) and mixcolumns in the first 5 rounds of the encryption process. The decryption process was parallelized in subshift transformations, both transformations were implemented at the same time. This research produced a modified AES encryption and decryption method and algorithm with the aim of minimizing the resources required for hardware implementation. The method in this article was applied to Xilinx ISE 14.7 software. The experimental results showed that the encryption process required 2,357 slice LUT's, 845 occupied slices and 26 IOB's, while the decryption process required 2,896 LUT's, 1,323 occupied slices and 26 IOB's resources. The encryption and decryption processes each took an average of 2.891 nanoseconds and 3.467 nanoseconds for every 128 bits of data. This approach leads us to obtain a component with minimum resources and enough computational speed.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131892","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 : 2023-12-31DOI: 10.21924/cst.8.2.2023.1240
Irwansyah Saputra, Y. Arkeman, Indra Jaya, I. Hermadi, Nur Arifin Akbar, Indrajani Sutedja
Blockchain technology offers data transparency and traceability, which is particularly useful in the agricultural sector, especially within the supply chains of commodities like coffee and fish. This sector often encounters issues such as quality degradation, unclear information, and socioeconomic injustice affecting stakeholders. The implementation of Static Smart Contracts (SSCs) on blockchains provides a structured method for executing agreements. However, this approach also has limitations, including a lack of flexibility and responsiveness to dynamic changes in the supply chain. Despite these challenges, blockchain remains a valuable tool for ensuring transaction transparency, traceability, and integrity, which are vital in agriculture. These limitations involve unchangeable parameters, rigid rules, and constraints on adaptability and scalability. This study aims to tackle these issues by designing a more dynamic and responsive smart contract system. We introduce AniraBlock, a revolutionary concept for the agricultural supply chain, particularly in the coffee and fish sectors, by implementing Dynamic Smart Contracts (DSCs) based on a key-value format framework. Unlike SSCs, DSCs offer enhanced adaptability and scalability, addressing the former's limitations. Our study adopts a mixed-method approach, utilizing both qualitative and quantitative data to validate AniraBlock's effectiveness. Preliminary results show significant improvements in data management and supply chain transparency. The proposed framework has the potential to influence the agricultural sector by boosting data integrity and operational efficiency.
{"title":"AniraBlock: A leap towards dynamic smart contracts in agriculture using blockchain based key-value format framework","authors":"Irwansyah Saputra, Y. Arkeman, Indra Jaya, I. Hermadi, Nur Arifin Akbar, Indrajani Sutedja","doi":"10.21924/cst.8.2.2023.1240","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1240","url":null,"abstract":"Blockchain technology offers data transparency and traceability, which is particularly useful in the agricultural sector, especially within the supply chains of commodities like coffee and fish. This sector often encounters issues such as quality degradation, unclear information, and socioeconomic injustice affecting stakeholders. The implementation of Static Smart Contracts (SSCs) on blockchains provides a structured method for executing agreements. However, this approach also has limitations, including a lack of flexibility and responsiveness to dynamic changes in the supply chain. Despite these challenges, blockchain remains a valuable tool for ensuring transaction transparency, traceability, and integrity, which are vital in agriculture. These limitations involve unchangeable parameters, rigid rules, and constraints on adaptability and scalability. This study aims to tackle these issues by designing a more dynamic and responsive smart contract system. We introduce AniraBlock, a revolutionary concept for the agricultural supply chain, particularly in the coffee and fish sectors, by implementing Dynamic Smart Contracts (DSCs) based on a key-value format framework. Unlike SSCs, DSCs offer enhanced adaptability and scalability, addressing the former's limitations. Our study adopts a mixed-method approach, utilizing both qualitative and quantitative data to validate AniraBlock's effectiveness. Preliminary results show significant improvements in data management and supply chain transparency. The proposed framework has the potential to influence the agricultural sector by boosting data integrity and operational efficiency.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132017","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 : 2023-12-31DOI: 10.21924/cst.8.2.2023.1299
Lailan Ni'mah, S. Juliastuti, M. Mahfud
This study describes the efficacy of microwave technology for the preparation of an activated carbon from Lansium domesticum peel as an adsorbent to adsorb Fe, Cu, and Mn from acid mine waste. In contrast to the conventional pyrolytic carbonization technique, the described method demonstrated several unparalleled advantages, including superior energy efficiency and remarkably rapid processing. The reported microwave irradiation method was able readily to achieve a morphology and extensive surface area similar to that of a sample produced using the traditional pyrolytic carbonization method for 2 hours, and this was accomplished in just 10 minutes. The activated carbon obtained was characterized using SEM-EDX, BET-BJH, and proximate test and applied to adsorb metal ions from acid mine waste to evaluate the isothermal adsorption model. The best power for activated carbon production was 400 watts for 10 minutes, which met the requirements of ASTM D 4607 for determining the iodine value of activated carbon. Optimal mass for adsorbing Fe, Cu, and Mn from acid mine waste was 4 grams with the removal percentages of 94.08%, 83.69%, and 90.67%, respectively. BET surface area was 1367.0385 m2/g along with a BJH cumulative volume and an average pore diameter of 1.112 cm3/g and 2.25 nm, respectively. This suggests that it possesses mesoporous characteristics and adheres to the Langmuir model during the adsorption process, signifying monolayer adsorption. Meanwhile, kinetics followed the pseudo-second-order rate equation.
{"title":"One-stage microwave-assisted activated carbon preparation from Langsat peel raw material for adsorption of iron, manganese and copper from acid mining waste","authors":"Lailan Ni'mah, S. Juliastuti, M. Mahfud","doi":"10.21924/cst.8.2.2023.1299","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1299","url":null,"abstract":"This study describes the efficacy of microwave technology for the preparation of an activated carbon from Lansium domesticum peel as an adsorbent to adsorb Fe, Cu, and Mn from acid mine waste. In contrast to the conventional pyrolytic carbonization technique, the described method demonstrated several unparalleled advantages, including superior energy efficiency and remarkably rapid processing. The reported microwave irradiation method was able readily to achieve a morphology and extensive surface area similar to that of a sample produced using the traditional pyrolytic carbonization method for 2 hours, and this was accomplished in just 10 minutes. The activated carbon obtained was characterized using SEM-EDX, BET-BJH, and proximate test and applied to adsorb metal ions from acid mine waste to evaluate the isothermal adsorption model. The best power for activated carbon production was 400 watts for 10 minutes, which met the requirements of ASTM D 4607 for determining the iodine value of activated carbon. Optimal mass for adsorbing Fe, Cu, and Mn from acid mine waste was 4 grams with the removal percentages of 94.08%, 83.69%, and 90.67%, respectively. BET surface area was 1367.0385 m2/g along with a BJH cumulative volume and an average pore diameter of 1.112 cm3/g and 2.25 nm, respectively. This suggests that it possesses mesoporous characteristics and adheres to the Langmuir model during the adsorption process, signifying monolayer adsorption. Meanwhile, kinetics followed the pseudo-second-order rate equation.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135086","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 : 2023-12-31DOI: 10.21924/cst.8.2.2023.1318
Agam Duma, Kalista Wibowo, Rizki Megawati, Vilia Kartika Setyaningrum, Erika Wahyu Putri, A. S. Handayani, M. D. Solikhah, Achmad Chafidz
Fatty Acid Methyl Ester (FAME) or palm oil methyl ester is one of the palm oil derivatives in which one of the anionic surfactants that can be generated from it is methyl ester sulfonate (MES). This bio-based surfactant can reduce the interfacial tension (IFT) between oil and water. To produce a bio-based polymeric surfactant, sulfonate groups from MES were grafted onto polymer chains. Palm oil methyl ester was reacted with sulfuric acid (H2SO4) to synthesize MES. Afterwards, MES was reacted with the Ethyl Acrylate (EA) monomer to synthesize polymeric surfactant. Investigating this route to produce a bio-based polymeric surfactant has become the novelty of this study. This study showed that the best polymerization result was obtained at a mole ratio of MES to EA (1:0.5) with the highest viscosity of 14.47 mm2/s. The critical micelle concentration (CMC) analysis showed 0.5% at a mole ratio of MES to EA (1:0.5) which corresponded to the lowest interfacial tension (IFT) of 1.95 x 10-3 mN/m. Meanwhile, the contact angle gradually decreased from 58.44 to 11.79°. The polymeric surfactant, furthermore, was analyzed using FTIR and H-NMR and successfully confirmed the formation of bio-based polymeric surfactant. The core flooding experiment found that approximately 16.57% of oil could be recovered. The results of the study revealed a good potential of the polymeric surfactant to be applied in chemical enhanced oil recovery (CEOR).
脂肪酸甲酯（FAME）或棕榈油甲酯是棕榈油衍生物之一，其中可生成的阴离子表面活性剂之一是甲酯磺酸盐（MES）。这种生物基表面活性剂可以降低油和水之间的界面张力（IFT）。为了生产生物基聚合物表面活性剂，将 MES 中的磺酸基接枝到聚合物链上。棕榈油甲酯与硫酸（H2SO4）反应合成 MES。然后，MES 与丙烯酸乙酯（EA）单体反应，合成聚合物表面活性剂。研究用这种方法生产生物基聚合物表面活性剂是本研究的新颖之处。研究表明，MES 与 EA 的摩尔比为 1:0.5 时聚合效果最好，粘度最高，为 14.47 mm2/s。临界胶束浓度（CMC）分析表明，当 MES 与 EA 的摩尔比为 1:0.5 时，临界胶束浓度为 0.5%，对应的最低界面张力（IFT）为 1.95 x 10-3 mN/m。同时，接触角从 58.44°逐渐下降到 11.79°。此外，还利用傅立叶变换红外光谱和 H-NMR 对聚合物表面活性剂进行了分析，成功证实了生物基聚合物表面活性剂的形成。岩心淹没实验发现，大约有 16.57% 的石油可以被回收。研究结果揭示了该聚合物表面活性剂在化学强化采油（CEOR）中的良好应用潜力。
{"title":"Investigating potential application of bio-based polymeric surfactant using methyl ester from palm oil for chemical enhanced oil recovery (CEOR)","authors":"Agam Duma, Kalista Wibowo, Rizki Megawati, Vilia Kartika Setyaningrum, Erika Wahyu Putri, A. S. Handayani, M. D. Solikhah, Achmad Chafidz","doi":"10.21924/cst.8.2.2023.1318","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1318","url":null,"abstract":"Fatty Acid Methyl Ester (FAME) or palm oil methyl ester is one of the palm oil derivatives in which one of the anionic surfactants that can be generated from it is methyl ester sulfonate (MES). This bio-based surfactant can reduce the interfacial tension (IFT) between oil and water. To produce a bio-based polymeric surfactant, sulfonate groups from MES were grafted onto polymer chains. Palm oil methyl ester was reacted with sulfuric acid (H2SO4) to synthesize MES. Afterwards, MES was reacted with the Ethyl Acrylate (EA) monomer to synthesize polymeric surfactant. Investigating this route to produce a bio-based polymeric surfactant has become the novelty of this study. This study showed that the best polymerization result was obtained at a mole ratio of MES to EA (1:0.5) with the highest viscosity of 14.47 mm2/s. The critical micelle concentration (CMC) analysis showed 0.5% at a mole ratio of MES to EA (1:0.5) which corresponded to the lowest interfacial tension (IFT) of 1.95 x 10-3 mN/m. Meanwhile, the contact angle gradually decreased from 58.44 to 11.79°. The polymeric surfactant, furthermore, was analyzed using FTIR and H-NMR and successfully confirmed the formation of bio-based polymeric surfactant. The core flooding experiment found that approximately 16.57% of oil could be recovered. The results of the study revealed a good potential of the polymeric surfactant to be applied in chemical enhanced oil recovery (CEOR).","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131421","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}
The transesterification of Calophyllum inophyllum seed oil into biodiesel using Javanese Moringa oleifera leaf ash catalyst with various reaction conditions has been completed. MA-500 (Moringa ash at 500°C for 3 h) and MA-900 (Moringa ash at 900°C for 3 h) catalysts were obtained by grinding Javanese old Moringa oleifera leaf (MP) and then calcined for 3 h at 500 and 900°C. The crude Calophyllum inophyllum seed oil was degummed (OD) prior to continue the esterification process (ODE). The MA-500 and MA-900 catalysts were tested for their activity and selectivity through the ODE transesterification with various catalyst weights (3, 6, and 9% (w/w)), reaction temperature (55, 60, and 65°C), oil: methanol mole ratio (1:3, 1:6, and 1:9), and reaction time (60, 90, 120, and 150 minutes). The results showed that the MA-500 and MA-900 catalysts contained 18.17% and 52.91% Ca respectively. The esterification reaction could reduce FFA levels to 89.82%, from 19.46% to 1.98%. ODE transesterification with MA-900 catalyst optimum reaction conditions with a catalyst weight of 3%, reaction temperature of 60°C, oil: methanol mole ratio of 1:9, and reaction time of 120 min, 76.17% FAME yield was observed. The MA-900 catalyst has the potential to be an effective green catalyst.
{"title":"Study of green and sustainable heterogeneous catalyst produced from Javanese Moringa oleifera leaf ash for the transesterification of Calophyllum inophyllum seed oil","authors":"Destania Ayu, Wega Ramdhani, Trisunaryanti, Triyono","doi":"10.21924/cst.8.2.2023.1202","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1202","url":null,"abstract":"The transesterification of Calophyllum inophyllum seed oil into biodiesel using Javanese Moringa oleifera leaf ash catalyst with various reaction conditions has been completed. MA-500 (Moringa ash at 500°C for 3 h) and MA-900 (Moringa ash at 900°C for 3 h) catalysts were obtained by grinding Javanese old Moringa oleifera leaf (MP) and then calcined for 3 h at 500 and 900°C. The crude Calophyllum inophyllum seed oil was degummed (OD) prior to continue the esterification process (ODE). The MA-500 and MA-900 catalysts were tested for their activity and selectivity through the ODE transesterification with various catalyst weights (3, 6, and 9% (w/w)), reaction temperature (55, 60, and 65°C), oil: methanol mole ratio (1:3, 1:6, and 1:9), and reaction time (60, 90, 120, and 150 minutes). The results showed that the MA-500 and MA-900 catalysts contained 18.17% and 52.91% Ca respectively. The esterification reaction could reduce FFA levels to 89.82%, from 19.46% to 1.98%. ODE transesterification with MA-900 catalyst optimum reaction conditions with a catalyst weight of 3%, reaction temperature of 60°C, oil: methanol mole ratio of 1:9, and reaction time of 120 min, 76.17% FAME yield was observed. The MA-900 catalyst has the potential to be an effective green catalyst.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132786","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 : 2023-12-31DOI: 10.21924/cst.8.2.2023.1214
R. Arbianti, Angelina, Bryan Suryapranata, Linatri Purwati Latifah, Najah Fadilah Putri, Tania Surya Utami, Y. Muharam, Slamet
A novel green extraction method combining enzymatic and ultrasound-assisted aqueous two-phase extractions was employed to enhance and purify the flavonoid extract from Strobilanthes crispus leaves. Cellulase was used in the pretreatment, and ethanol-(NH4)2SO4 was selected as the solvent. A concentration of 7% (w/w) cellulase and a duration of 2 h were the optimal conditions for pretreatment. The optimal conditions for ultrasound-assisted aqueous two-phase extraction were 33% (w/w) ethanol and 14% (w/w) (NH4)2SO4 as they produced a yield (77.81%), partition coefficient (31.17), extraction efficiency (98.04%), and a high total flavonoid content (0.3666 mg QE/g dry leaf powder). Six compounds from the leaf extract were identified through liquid chromatography-mass spectrometry/mass spectrometry-quadrupole-time of flight (LCMS/MS-Q-TOF) analysis. The crude extract and three compounds in it (kaempferol, graveobioside A, and genistein) showed an antidiabetic activity with IC50 values of 390.35, 201.87, 292.73, and 431.82 mg/mL, respectively. These values are comparable to the standard drug acarbose.
{"title":"Combined enzymatic and ultrasound-assisted aqueous two-phase extraction of antidiabetic flavonoid compounds from Strobilanthes crispus leaves","authors":"R. Arbianti, Angelina, Bryan Suryapranata, Linatri Purwati Latifah, Najah Fadilah Putri, Tania Surya Utami, Y. Muharam, Slamet","doi":"10.21924/cst.8.2.2023.1214","DOIUrl":"https://doi.org/10.21924/cst.8.2.2023.1214","url":null,"abstract":"A novel green extraction method combining enzymatic and ultrasound-assisted aqueous two-phase extractions was employed to enhance and purify the flavonoid extract from Strobilanthes crispus leaves. Cellulase was used in the pretreatment, and ethanol-(NH4)2SO4 was selected as the solvent. A concentration of 7% (w/w) cellulase and a duration of 2 h were the optimal conditions for pretreatment. The optimal conditions for ultrasound-assisted aqueous two-phase extraction were 33% (w/w) ethanol and 14% (w/w) (NH4)2SO4 as they produced a yield (77.81%), partition coefficient (31.17), extraction efficiency (98.04%), and a high total flavonoid content (0.3666 mg QE/g dry leaf powder). Six compounds from the leaf extract were identified through liquid chromatography-mass spectrometry/mass spectrometry-quadrupole-time of flight (LCMS/MS-Q-TOF) analysis. The crude extract and three compounds in it (kaempferol, graveobioside A, and genistein) showed an antidiabetic activity with IC50 values of 390.35, 201.87, 292.73, and 431.82 mg/mL, respectively. These values are comparable to the standard drug acarbose.","PeriodicalId":36437,"journal":{"name":"Communications in Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130910","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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