The Role of E-Money in Sustainable Smart City Development in Bogor City Area

In the current era of society 5.0, especially in industry 4.0, the use of information systems is very important where in this era the community is expected to help the development of smart cities. In this era, people always carry out activities with technology and digitalization, one of which is how to transact that transforms electronically with technology. Currently, e-money is considered to have its own role in the sustainability of community activities, especially in the city of Bogor, so that if the role of e-money can be utilized, a positive value can be generated for the sustainability of smart city development. To assess the success of the role of e-money, this research instrument was built using the DeLone and McLean methods in building a research model that aims to support the development of smart cities with aspects of indicators such as information quality, system quality, service quality, user satisfaction level, utilizing and net benefit. The research method used in this study is factor analysis to process the data obtained from the questionnaire. The Alpha Cronbach value in this study has a value of 0.971 or 97.1%, so it can be concluded that the positive influence of e-money is very large to support the development of smart cities in Bogor City. This research is expected to provide information related to the sustainable development of smart cities in Bogor City

Augmented Reality for Enhanced Visualization of MOF Adsorbents

Augmented reality (AR) is an emerging technique used to improve visualization and comprehension of complex 3D materials. This approach has been applied not only in the field of chemistry but also in real estate, physics, mechanical engineering, and many other areas. Here, we demonstrate the workflow for an app-free AR technique for visualization of metal–organic frameworks (MOFs) and other porous materials to investigate their crystal structures, topology, and gas adsorption sites. We think this workflow will serve as an additional tool for computational and experimental scientists working in the field for both research and educational purposes

Elektrosintesis Nanokomposit α-MnO2/C dan Fabrikasinya untuk Aplikasi Superkapasitor

Komponen penyimpan energi semakin dibutuhkan seiring dengan berkembangnya peralatan berenergi listrik. Namun, komponen penyimpan energi yang terdapat di pasaran memiliki banyak kelemahan sehingga mengurangi efisiensi penggunaan alat listrik. Superkapasitor memiliki keunggulan dalam beberapa hal dibandingkan kapasitor dan baterai kimia. Selain mempunyai kualitas yang lebih bagus, superkapasitor pula dapat dibuat dari material yang relatif murah dan mudah didapat. Materialnya yaitu MnO2 dan karbon. Dengan menggunakan metode elektrolisis yang cukup sederhana, MnO2 disintesis dalam ukuran nanopartikel agar kapasitas penyimpanan semakin besar. Nanopartikel MnO2 dikompositkan bersama karbon sehingga menghasilkan superkapasitor yang memiliki kapasitas dan konduktivitas yang tinggi dengan memvariasikan tegangan yang dijalankan sebesar 2 V ; 2,5 V ; 3 V ; dan 3,5 V ketika sintesis MnO2. Dari penelitian ini, kami mendapatkan hasil berupa kapasitas MnO2 tertinggi yaitu sintesis pada tegangan 2 V dengan nilai kapasitansisebesar 48 F/g. Nilai tersebut seribu kali lebih besar dari nilai kapasitansi kapasitor komersial. Sehingga dapat disimpulkan bahwa kondisi yang tepat untuk sintesis MnO2 yaitu pada tegangan 2 V.Kata Kunci : elektroda, nanokomposit, superkapasito

DigiMOF: A Database of Metal–Organic Framework Synthesis Information Generated via Text Mining

The vastness of materials space, particularly that which is concerned with metal–organic frameworks (MOFs), creates the critical problem of performing efficient identification of promising materials for specific applications. Although high-throughput computational approaches, including the use of machine learning, have been useful in rapid screening and rational design of MOFs, they tend to neglect descriptors related to their synthesis. One way to improve the efficiency of MOF discovery is to data-mine published MOF papers to extract the materials informatics knowledge contained within journal articles. Here, by adapting the chemistry-aware natural language processing tool, ChemDataExtractor (CDE), we generated an open-source database of MOFs focused on their synthetic properties: the DigiMOF database. Using the CDE web scraping package alongside the Cambridge Structural Database (CSD) MOF subset, we automatically downloaded 43,281 unique MOF journal articles, extracted 15,501 unique MOF materials, and text-mined over 52,680 associated properties including the synthesis method, solvent, organic linker, metal precursor, and topology. Additionally, we developed an alternative data extraction technique to obtain and transform the chemical names assigned to each CSD entry in order to determine linker types for each structure in the CSD MOF subset. This data enabled us to match MOFs to a list of known linkers provided by Tokyo Chemical Industry UK Ltd. (TCI) and analyze the cost of these important chemicals. This centralized, structured database reveals the MOF synthetic data embedded within thousands of MOF publications and contains further topology, metal type, accessible surface area, largest cavity diameter, pore limiting diameter, open metal sites, and density calculations for all 3D MOFs in the CSD MOF subset. The DigiMOF database and associated software are publicly available for other researchers to rapidly search for MOFs with specific properties, conduct further analysis of alternative MOF production pathways, and create additional parsers to search for additional desirable properties

Experimental and Computational Study of CO2 Storage and Sequestration with Aqueous 2-Amino-2-hydroxymethyl-1,3-propanediol (TRIS) Solutions

Experimental solubility data of CO2 in (5 and 10) mass% TRIS aqueous solutions were measured at (318.15 and 333.15) K and up to 10 MPa. The solubility data were well correlated with the modified Kent-Eisenberg model. The reaction mechanism, reaction energies, and equilibrium constants for the formation of bicarbonate and carbamate from CO2, H2O, and TRIS were studied using the quantum-chemical approach COSMO-RS (conductor-like screening model for real solvents) at the BP/TZVP level. The bicarbonate and carbamate formations were confirmed by using Fourier transform infrared (FTIR) spectroscopy. The results demonstrate that the formation of the bicarbonate anion is the main product formed by the direct reaction of CO2 with water and TRIS, and reveal that the carbamate anion was formed by a proton transfer from TRIS-CO2 zwitterion to TRIS. Density functional theory (DFT) calculations with transition-state optimization and intrinsic reaction coordinate (IRC) in water using IEF-PCM solvation model at the B3LYP/6-311++G(d,p) levels of theory were employed to support the reaction pathway for the bicarbonate and carbamate formations. The conversion of the absorption product to stable carbonate (CaCO3) was also investigated experimentally by adding various Ca2+ sources, CaCl2\center dot 2H(2)O aqueous solution, and artificial seawater

Manufacture of a Hydrophobic Silica Nanoparticle Composite Membrane for Oil-Water Emulsion Separation

The superhydrophobic composite membrane was successfully manufactured by a sol-gel method by drying the surrounding pressure. Tetraethylorthosilicate (TEOS) was used as a hydrophobic agent, while waterglass was used as a source of silica. The effect of the water to waterglass ratio (noted at 16:1 and 19:1) was evaluated to study the hydrophobic properties of the silica film coated composite membrane surface. By measuring the water contact angle on the film surface, the highest contact angle was found to occur at the ratio of 19:1, which is 143.86°. The stability of the composite membrane was also investigated by immersing the membrane in water until day 6. The results show that the synthesized composite membrane has good stability until day 6. The hydrophobicity of the surface of the silica film membrane was found to be unaffected by immersion time. Furthermore, the hydrophobicity increased after 6 days due to the interaction of alkyl groups with the humidified environment, and the surface was more stable in hydrophobicity (i.e., the contact angle of water is 153.79°). In addition, hydrophobic properties were obtained, confirming that this film has the potential to be applied to the separation of oil-water emulsions

Sintesis dan Karakterisasi Silika Aerogel Hidrofobik dan Oliofilik dari Pasir Laut sebagai Absorben Tumpahan Minyak

Proses pengolahan minyak di Indonesia sangat menguntungkan untuk perekonomian negara. Tetapi disamping itu, terdapat hal yang meyebabkan kerugian yaitu terjadinya tumpahan minyak. Tumpahan minyak bisa diatasi salah satunya dengan menggunakan absorben. Silika aerogel dapat digunakan sebagai absorben. Bahan baku utama sintesis silika aerogel adalah silika. Pada pasir laut di Indonesia rata-rata mengandung silika yang cukup tinggi yaitu sebesar 70%. Penelitian ini dilakukan untuk mengetahui pengaruh precursor dalam modifikasi material silika aerogel yang bersifat oliofilik dan hidrofobik. Pembuatan silika aerogel terbagi menjadi beberapa bagian yaitu pembuatan waterglass (sodium metasilikat) dari pasir laut, kemudian pembuatan silika aerogel dari waterglass. Dalam metode ini digunakan beberapa variabel pembanding yaitu dengan penambahan TEOS (tetraetil ortosilikat) dan heksana dengan perbandingan volume 1:1, 1:2, dan 1:3 sedangkan untuk penambahan etanol divariabelkan konsentrasi volumenya dengan rincian 10%, 20%, dan 30%. Bahan baku pasir laut dan produk silika aerogel dilakukan karakterisasi yang bertujuan untuk mengetahui sifat-sifatnya. Bahan baku pasir laut diuji dengan metode XRF (X-Ray Fluorescence) bertujuan mengetahui komponen yang terkandung dalam pasir silika dengan hasil SiO2 98,9%, K2O 1,2%, CaO 0,6%, TiO2 0,766%, V2O5 0,007%, MnO 0,028%, Fe2O3 0,431%, NiO 0,01%, CuO 0,035%, Yb2O3 0,03%. Sedangkan produk silika aerogel dilakukan uji sudut kontak dan uji serapan minyak, dari hasil uji sudut kontak didapat hasil pada sampel dua dengan penambahan TEOS dan heksana sebanyak 1:2 dan etanol 20% memiliki sudut kontak sebesar 143,95o sedangkan untuk uji serapan minyak sampel dua memiliki kemampuan menyerap minyak sebesar 13,98 g/g silika aerogel. Oil processing in Indonesia is very profitable for the economy of the country. However, in the exploration process there might be an oil spill which can cause a loss in oil production. Oil spill can be overcome by using absorbent. Silica aerogel can be used as absorbent. The main raw material of silica absorbent is silica. Sea sand in Indonesia contains high enough silica reaches 70% on average. This research was conducted to determine the effect of precursors in the modification of silica aerogel which is oliophilic and hydrophobic. The synthesys of silica aerogel was divided into several parts, namely synthesys waterglass from the sea sand and synthesys silica aerogel from waterglass. In this method, several variables were used with addition of TEOS (tetraethyl orthosilicate) and hexane with volume ratio 1:1, 1:2, and 1:3, while for addition of ethanol was varied with volume concentration of 10%, 20%, and 30%. Sea sand as raw material and silica aerogel as product was characterized in order to determine their properties. Sea sand were characterized using XRF (X-Ray Fluorescence) method contains SiO2 98.9%, K2O 1.2%, CaO 0.6%, TiO2 0.766%, V2O5 0.007%, MnO 0.028%, Fe2O3 0.431%, NiO 0.01%, CuO 0.035%, Yb2O3 0.03%. While the silica aerogel was characterixed by contact angle method and oil absorption test. In result, sample with addition of TEOS:hexane as much as 1:2 and ethanol 20% have contact angle of 143.95oand has ability to absorb oil 13.98 g/g silica aerogel

Sintesis dan Karakterisasi Silika Aerogel Hidrofobik dan Oliofilik dari Pasir Laut sebagai Absorben Tumpahan Minyak

Proses pengolahan minyak di Indonesia sangat menguntungkan untuk perekonomian negara. Tetapi disamping itu, terdapat hal yang meyebabkan kerugian yaitu terjadinya tumpahan minyak. Tumpahan minyak bisa diatasi salah satunya dengan menggunakan absorben. Silika aerogel dapat digunakan sebagai absorben. Bahan baku utama sintesis silika aerogel adalah silika. Pada pasir laut di Indonesia rata-rata mengandung silika yang cukup tinggi yaitu sebesar 70%. Penelitian ini dilakukan untuk mengetahui pengaruh precursor dalam modifikasi material silika aerogel yang bersifat oliofilik dan hidrofobik. Pembuatan silika aerogel terbagi menjadi beberapa bagian yaitu pembuatan waterglass (sodium metasilikat) dari pasir laut, kemudian pembuatan silika aerogel dari waterglass. Dalam metode ini digunakan beberapa variabel pembanding yaitu dengan penambahan TEOS (tetraetil ortosilikat) dan heksana dengan perbandingan volume 1:1, 1:2, dan 1:3 sedangkan untuk penambahan etanol divariabelkan konsentrasi volumenya dengan rincian 10%, 20%, dan 30%. Bahan baku pasir laut dan produk silika aerogel dilakukan karakterisasi yang bertujuan untuk mengetahui sifat-sifatnya. Bahan baku pasir laut diuji dengan metode XRF (X-Ray Fluorescence) bertujuan mengetahui komponen yang terkandung dalam pasir silika dengan hasil SiO2 98,9%, K2O 1,2%, CaO 0,6%, TiO2 0,766%, V2O5 0,007%, MnO 0,028%, Fe2O3 0,431%, NiO 0,01%, CuO 0,035%, Yb2O3 0,03%. Sedangkan produk silika aerogel dilakukan uji sudut kontak dan uji serapan minyak, dari hasil uji sudut kontak didapat hasil pada sampel dua dengan penambahan TEOS dan heksana sebanyak 1:2 dan etanol 20% memiliki sudut kontak sebesar 143,95o sedangkan untuk uji serapan minyak sampel dua memiliki kemampuan menyerap minyak sebesar 13,98 g/g silika aerogel.Oil processing in Indonesia is very profitable for the economy of the country. However, in the exploration process there might be an oil spill which can cause a loss in oil production. Oil spill can be overcome by using absorbent. Silica aerogel can be used as absorbent. The main raw material of silica absorbent is silica. Sea sand in Indonesia contains high enough silica reaches 70% on average. This research was conducted to determine the effect of precursors in the modification of silica aerogel which is oliophilic and hydrophobic. The synthesys of silica aerogel was divided into several parts, namely synthesys waterglass from the sea sand and synthesys silica aerogel from waterglass. In this method, several variables were used with addition of TEOS (tetraethyl orthosilicate) and hexane with volume ratio 1:1, 1:2, and 1:3, while for addition of ethanol was varied with volume concentration of 10%, 20%, and 30%. Sea sand as raw material and silica aerogel as product was characterized in order to determine their properties. Sea sand were characterized using XRF (X-Ray Fluorescence) method contains SiO2 98.9%, K2O 1.2%, CaO 0.6%, TiO2 0.766%, V2O5 0.007%, MnO 0.028%, Fe2O3 0.431%, NiO 0.01%, CuO 0.035%, Yb2O3 0.03%. While the silica aerogel was characterixed by contact angle method and oil absorption test. In result, sample with addition of TEOS:hexane as much as 1:2 and ethanol 20% have contact angle of 143.95oand has ability to absorb oil 13.98 g/g silica aerogel

Computational Characterization of Zr-Oxide MOFs for Adsorption Applications.

Funder: Cambridge Crystallographic Data CentreFunder: University of VermontFunder: Engineering and Physical Sciences Research CouncilZr-oxide secondary building units construct metal-organic framework (MOF) materials with excellent gas adsorption properties and high mechanical, thermal, and chemical stability. These attributes have led Zr-oxide MOFs to be well-recognized for a wide range of applications, including gas storage and separation, catalysis, as well as healthcare domain. Here, we report structure search methods within the Cambridge Structural Database (CSD) to create a curated subset of 102 Zr-oxide MOFs synthesized to date, bringing a unique record for all researchers working in this area. For the identified structures, we manually corrected the proton topology of hydroxyl and water molecules on the Zr-oxide nodes and characterized their textural properties, Brunauer-Emmett-Teller (BET) area, and topology. Importantly, we performed systematic periodic density functional theory (DFT) calculations comparing 25 different combinations of basis sets and functionals to calculate framework partial atomic charges for use in gas adsorption simulations. Through experimental verification of CO2 adsorption in selected Zr-oxide MOFs, we demonstrate the sensitivity of CO2 adsorption predictions at the Henry's regime to the choice of the DFT method for partial charge calculations. We characterized Zr-MOFs for their CO2 adsorption performance via high-throughput grand canonical Monte Carlo (GCMC) simulations and revealed how the chemistry of the Zr-oxide node could have a significant impact on CO2 uptake predictions. We found that the maximum CO2 uptake is obtained for structures with the heat of adsorption values >25 kJ/mol and the largest cavity diameters of ca. 6-7 Å. Finally, we introduced augmented reality (AR) visualizations as a means to bring adsorption phenomena alive in porous adsorbents and to dynamically explore gas adsorption sites in MOFs