Long-term Analysis Research Articles

Aligning Indonesia's economic goals with SDGS: Strengthening Qur'anic principles in Islamic finance

Purpose – This research examines the relationship between Islamic bank financing aligned with the Sustainable Development Goals (SDGs) and economic growth, incorporating Qur'anic principles in Islamic finance.Methodology – Quarterly time-series data from Q1 2014 to Q1 2022 were analyzed using the cointegration and ARDL approaches. Data sources include the PSIFIs for Islamic Banks (IFSB Database), Indonesia's GDP (BPS), and the Financial Services Authority (OJK).Findings – Long-term analysis reveals that Islamic financing in SDG sectors such as SDG1 (No Poverty), SDG2 (Zero Hunger), SDG3 (Good Health and Well-being), SDG4 (Quality Education), and SDG11 (Sustainable Cities and Communities) positively correlate with economic growth, while SDG8 (Decent Work and Economic Growth) shows an inverse relationship. In the short term, financing in SDG2, SDG3, SDG8, and SDG9 (Industry, Innovation, and Infrastructure) positively impacts economic growth, whereas SDG6 (Clean Water and Sanitation) exhibits a negative association. These findings highlight Islamic finance's potential to address socio-economic challenges rooted in Qur'anic values, such as Surah al-Nisā’ [4]: 29 and al-Baqarah [2]: 261.Implications – Policymakers are encouraged to promote Islamic microfinance for SMEs and invest in rural sanitation infrastructure (SDG6). Furthermore, financing renewable energy projects (SDG7) aligns with sustainable development goals.Originality – This study bridges Islamic finance and sustainable development by integrating a Qur'anic perspective into the SDG framework, offering insights into leveraging Islamic finance to achieve sustainability and economic growth, while adhering to Islamic ethical principles.

The political drivers of antipoverty policy in Italy: persistence, change and reversals

Abstract This article analyses the political determinants of antipoverty policy in Italy between 1948 and 2022, providing a long-term analysis of the Italian minimum income scheme. We look for an explanation of that evolution drawing on three theoretical perspectives: veto players, gradual institutional change, and party competition. Our methodology is process tracing which involves the examination of ‘diagnostic’ pieces of evidence for our broad political-historical analysis. We argue that the so called ‘neglect’ phase until 1992 can be explained by the veto players theory, the period after 1992 by gradual institutional change, whereas the final introduction of a minimum income scheme in 2018 is the result of competitive dynamics. The main lesson is that a case study analysis of the politics of anti-poverty policy offers fresh insights into a major challenge in capitalist systems, combating rising poverty trends.

A long-term analysis of oxidant (OX = O3 + NO2) and its local and regional levels in Tehran, Iran, a high NOx-saturated condition

Oxidant (OX), the sum of ozone (O3) and nitrogen dioxide (NO2), is used to determine nitrogen oxides (NOx)-independent regional contribution and NOx-dependent local contribution. This study investigates OX trends and its local and regional levels in Tehran, Iran using the data from 21 monitoring stations from 2012 to 2022 and satellite remote sensing data (TROPOMI) for 2022. The spatiotemporal trends of O3, NO2, and OX are first examined using ground-based and remote sensing data, and then the polar plots are employed to identify the dominant directions of OX transport and its sources. Subsequently, the local and regional contributions of OX were determined using OX-NOx relationship. The findings indicated that the OX trend is primarily affected by O3 fluctuations during the warmer months, whereas NO2 variations have a stronger correlation with OX during the remaining months. The emissions from the central zone of the city were mostly caused by the transportation fleet. The emissions from industries in the south also have a significant effect on the city’s OX concentration. Moreover, the local contribution of OX, reaching a maximum value of 0.15 ppb/ppb NOx (for both monthly and yearly analysis), contributes to the elevation of OX levels during nighttime. In contrast, the OX local contribution at daylight hours is mostly negative, with minimum values of − 0.15 ppb/ppb NOx for July and − 0.07 ppb/ppb NOx for 2012, indicating a decrease in the OX concentration with an increase in the local NOx emission. Furthermore, the OX levels, especially for daylight hours, is mostly related to its regional contribution with maximum of 100 ppb in July and 95 ppb in 2017, suggesting the necessity of considering regional emissions in developing mitigation scenarios. Lastly, our results indicate that the transportation fleet plays an undeniable role in contributing to the local emissions in Tehran.

Two-year outcomes using fast-acting sub-perception therapy for spinal cord stimulation: results of a real-world multicenter study in the United States

ABSTRACT Background Fast-acting Sub-perception Therapy (FAST) is a novel spinal cord stimulation (SCS) modality delivering paresthesia-free pain relief. Our study evaluated the longer-term, real-world impact of FAST on chronic pain. Research design and methods As part of a multicenter, real-world, consecutive case series, we retrospectively identified patients who used FAST-SCS and analyzed their data. The numerical rating scale (NRS) was used to evaluate the overall pain. Results Data from 315 patients were analyzed at baseline and their last available follow-up (median 6.8 months after SCS implantation). At the time of the analysis, 12-, 18-, and 24-month data were available for 112, 86, and 50 patients, respectively. At the last follow-up, NRS pain score was reduced by 5.5 ± 2.5 compared to baseline (from 7.8 ± 1.7 to 2.3 ± 2.0; p < 0.0001). Interim long-term analysis showed that results were sustained for up to 2 years, with 64% of patients reporting a minimal overall pain score (NRS ≤2/10). Conclusion This ongoing, real-world, multicenter study showed that FAST-SCS achieved significant paresthesia-free pain relief, while long-term interim analysis suggests that outcomes could be sustained for up to 2 years. Our data provide preliminary insights into the potential utility of this low-frequency sub-perception SCS paradigm using a biphasic active recharge pulse shape. Trial registration ClinicalTrials.gov (CT.gov identifier: NCT01550575).

Outcome evaluation and cost-effectiveness analysis for an integrated multidisciplinary diabetic limb salvage program: a combined observational and simulation study

IntroductionTo compare the clinical outcomes and healthcare utilization of patients enrolled in the multidisciplinary Diabetic Foot in Primary and Tertiary (DEFINITE) Care program with a matched historical cohort and estimate...

Long-Term Statistical Analysis of Severe Weather and Climate Events in Greece

Long-Term Statistical Analysis of Severe Weather and Climate Events in Greece

The Disappearance of COVID-19 Data Dashboards: The Case of Ephemeral Data

Data dashboards provide a means for sharing multiple data products at a glance and were ubiquitous during the COVID-19 pandemic. Data dashboards tracked global and country-specific statistics and provided cartographic visualizations of cases, deaths, vaccination rates and other metrics. We examined the role of geospatial data on COVID-19 dashboards in the form of maps, charts, and graphs. We organize our review of 193 COVID-19 dashboards by region and compare the accessibility and operationality of dashboards over time and the use of web maps and geospatial visualizations. We found that of the dashboards reviewed, only 17% included geospatial visualizations. We observe that many of the COVID-19 dashboards from our analysis are no longer accessible (66%) and consider the ephemeral nature of data and dashboards. We conclude that coordinated efforts and a call to action to ensure the standardization, storage, and maintenance of geospatial data for use on data dashboards and web maps are needed for long-term use, analyses, and monitoring to address current and future public health and other challenging issues.

Long-term hydrological drought monitoring and trend analysis in Blue Nile River basin.

This research aims to monitor the hydrological drought trends within the geographical confines of Ethiopia, Sudan, and Egypt in the Blue Nile River Basin. Historical drought circumstances in the basin were analyzed through the utilization of the stream flow drought index (SDI). The long-term historical drought trend was investigated via the application of the Mann - Kendall Sen (MK) test. Streamflow data were collected at the border (GERD) (Ethiopia) and Khartoum and Dongola (Sudan) spanning the period from 1900 to 2001. Four distinct temporal scales were examined, including monthly (SDI1), seasonal (SDI3), bi-annual (SDI6), and annual (SDI12) frequency. Notably, SDI1, SDI3, and SDI6 exhibited a higher frequency of drought occurrences, whereas SDI12 demonstrated lower frequencies, accompanied by the longest duration of drought in all gauged stations. For the preceding 102-year period, two extreme drought events were identified across all stations: 1912/1913 and 1913/1914 in the Border and Dongola stations, and 1912/1913 and 1986/1987 in the Khartoum station. Moreover, the SDI12 results revealed that severe drought events manifested three, six, and four times, in the Border, Khartoum, and Dongola stations, respectively. Furthermore, an investigation of historical extreme and severe drought patterns led to the conclusion that extreme hydrological drought does not pose an imminent threat to downstream nations, including Egypt and Sudan. However, the trend analysis revealed that an increasing drought trend was observed in the Autumn season across all stations, while a positive trend characteristic of a wet condition was observed in the remaining seasons. Annual trend analysis did not show any statistically significant findings. Nevertheless, the study highlighted the imperative role of soil and water conservation measures in upstream countries, such as the Ethiopian highlands, in mitigating the prolonged effects of meteorological drought which gradually propagates into severe hydrological drought. Consequently, downstream nations must engage in cooperative efforts with upstream countries to address this issue collectively, rather than bestowing sole responsibility on the latter.

Short- and long-term health effects of job insecurity. Fixed effects panel analysis of German data.

Previous research has linked job insecurity to health deterioration. The risk accumulation model suggests that health effects of job insecurity may persist even after job security is restored, yet long-term empirical analyses are scarce. Our study evaluates the long-term effects of accumulated exposures to affective job insecurity on mental and physical health among the working-age population in Germany. Using data from the German Socioeconomic Panel (12 624 individuals; 84 219 observations), we applied panel regression models with individual fixed effects to assess short- and long-term health changes associated with affective job insecurity. Job insecurity was measured by respondents' worries about job security. Mental and physical health was recorded with the SF-12 scale. Job insecurity correlated with short-term worsening in mental and physical health. However, after job insecurity ceased, health recovery was incomplete resulting in a long-term health deterioration. The long-term effects were larger among respondents who accumulated more instances of job insecurity, and showed a similar pattern for mental and physical health. An additional analysis documented stronger health effects of job insecurity among lower educated persons. Our study is one of the first to empirically demonstrate the negative long-term health effects of job insecurity. Our findings for a well-protected labor market like Germany's, suggest that the health risks associated with job insecurity may be substantial and potentially underestimated by studies that focus solely on short-term effects.

Evaluation of the therapeutic effects of nebulized inhalation of hydrogen-rich water on primary blast lung injury in C57BL/6 mice.

Primary blast lung injury is a common and severe consequence of explosion events, characterized by immediate and delayed effects such as apnea and rapid shallow breathing. The overpressure generated by blasts leads to alveolar and capillary damage, resulting in ventilation-perfusion mismatch and increased intrapulmonary shunting. This reduces the effective gas exchange area, causing hypoxemia and hypercapnia. Hydrogen (H2), a small-molecular-weight, nonpolar diatomic molecule, has shown potential in treating various diseases due to its antioxidant and anti-inflammatory properties. This study evaluates the therapeutic effects of nebulized hydrogen-rich water on primary blast lung injury in C57BL/6 mice and explores the underlying mechanisms. C57BL/6 mice (n= 150), aged 6-8weeks, were randomly divided into 2 groups: the blast injury control group (n= 75) and the nebulized hydrogen-rich water treatment group (n= 75). Mice were exposed to a blast overpressure of 266±9.156 kPA and treated with either nebulized hydrogen-rich water or sterile injection water immediately postinjury. Observations were made at 6, 12, 24, and 48hours postinjury. Lung function was assessed using whole-body plethysmography, and arterial blood gases were analyzed. Lung tissue was examined histologically and biochemically for markers of inflammation and oxidative stress. The survival rates at different time points postinjury in the nebulized hydrogen-rich water treatment group were significantly higher than those in the blast injury control group (6hours postinjury: 89.3% vs 78.6%; 12hours postinjury: 81.3% vs 72%; 24hours postinjury: 81.3% vs 61.3%, P < .01). Lung function tests revealed significant improvements in tidal volume (12hours postinjury: 0.11±0.018 vs 0.08±0.016, 24hours postinjury: 0.16±0.013 vs 0.12±0.013, 48hours postinjury: 0.18±0.02 vs 0.13±0.014), respiratory rate (6hours postinjury: 235.07±12.82 vs 268.29±13.73; 12hours postinjury: 265.47±10.06 vs 342.16±16.34; 24hours postinjury: 248.20±9.28 vs 352.80±15.99; 48hours postinjury: 226.12±15.81 vs 318.18±15.81), and minute ventilation (12hours postinjury: 22.05±3.46 vs 15.93±3.68; 24hours postinjury: 27.30±2.15 vs 21.62±2.48; 48hours postinjury: 37.48±3.93 vs 28.32±2.98) in the nebulized hydrogen-rich water treatment group (P < .01). Arterial blood gas analysis indicated better oxygenation and reduced hypercapnia in the nebulized hydrogen-rich water treatment group (P < .05). Histologic examination showed reduced lung edema and hemorrhage in the nebulized hydrogen-rich water treatment group. Levels of inflammatory cytokines (interleukin-1β, interleukin-6, and tumor necrosis factor α) and oxidative stress markers (ie, malondialdehyde) were significantly lower, whereas antioxidant enzyme (total superoxide dismutase) activity was higher in the nebulized hydrogen-rich water treatment group compared with the blast injury control group (P < .01). Arterial blood gas analysis indicated better oxygenation and reduced hypercapnia in the nebulized hydrogen-rich water treatment group (P < .05). Histologic examination showed reduced lung edema and hemorrhage in the nebulized hydrogen-rich water treatment group. Levels of inflammatory cytokines (interleukin-1β, interleukin-6, and tumor necrosis factor α) and oxidative stress markers (ie, malondialdehyde) were significantly lower, whereas antioxidant enzyme (total superoxide dismutase) activity was higher in the nebulized hydrogen-rich water treatment group compared with the blast injury control group (P < .01). Hydrogen-rich water treatment significantly improves survival rates and lung function and reduces inflammation and oxidative stress in mice with primary blast lung injury. These findings suggest that hydrogen's antioxidant and anti-inflammatory properties play a crucial role in mitigating lung damage and improving respiratory function postinjury. Further long-term studies and imaging analyses are needed to confirm these findings and elucidate the molecular mechanisms involved. This study provides a theoretical basis for the clinical application of hydrogen-rich water in treating blast-induced lung injuries.

Long-term Prospective Comparative Analysis of Ototoxic and Survival Outcomes of Sequential Boost and Simultaneous Integrated Boost of Volumetric Modulated Arc Therapy for Head-Neck Carcinomas.

To compare the ototoxicity and survival in head and neck carcinoma patients treated with sequential (SEQ) and simultaneous integrated boost (SIB) of volumetric modulated arc therapy (VMAT). This long-term prospective study enrolled patients with histologically confirmed head and neck carcinoma, all receiving VMAT treatment. Audiological assessments were done using various tests at baseline, two weeks, treatment completion, six months, and 12 months. The changes in bone conduction pure tone thresholds were correlated with cochlear dose, comparing SEQ and SIB plans. We also investigated other significant late toxicities that led to dysphagia, voice changes, and xerostomia. Survival was assessed with the Kaplan-Meier analysis. The study included 93 patients (186 ears), 40 receiving radiation alone and 53 undergoing chemoradiation. Baseline hearing levels for the right and left ears were 13.3±2.3 dB and 14.2±1.5 dB. After 12 months of radiation, levels were 18.5±2.4 dB and 19.11±1.9 dB, respectively. No significant changes were observed between SEQ and SIB plans, but high-frequency shifts occurred. The cochlea tolerated up to 28 Gy without hearing loss in the radiation-alone group but showed loss at 9 Gy when combined with cisplatin chemotherapy. The maximum dose (Dmax) and the mean dose (Dmean) of pharyngeal constrictor muscles predicted dysphagia. No significant SEQ vs. SIB differences were found in late toxicity or survival outcomes. Modern radiotherapy techniques like VMAT adhere to cochlear dose limits. No significant differences were found between SEQ and SIB plans in sensorineural hearing loss, late toxicity, or survival, making both suitable for head and neck carcinoma treatment.

Outcomes of Metabolic and Bariatric Surgery in Patients with Inflammatory Bowel Disease: A Long-Term Retrospective Analysis.

Background: Metabolic and bariatric surgery (MBS) is a well-established treatment for severe obesity, yet its effects in patients with inflammatory bowel disease (IBD) are not well understood. MBS in this population presents unique challenges, including the potential for exacerbating inflammatory disease activity and causing complications such as malnutrition and medication malabsorption. This study aims to assess the long-term outcomes of MBS in IBD patients, focusing on both metabolic outcomes and its impact on the course of IBD. Methods: A retrospective analysis was conducted on 20 patients with IBD who underwent MBS at a tertiary center between 2005 and 2019. Data on baseline characteristics, surgical procedures, complications, weight loss, resolution of obesity-related diseases, and IBD-related outcomes were collected. Results: The cohort, primarily female (65%), had a mean preoperative body mass index (BMI) of 40.8 kg/m2. The MBS procedures performed were sleeve gastrectomy (n = 9), Roux-en-Y gastric bypass (n = 6), one-anastomosis gastric bypass (n = 2), and Laparoscopic Adjustable Gastric Banding (n = 3). No major 30-day complications were recorded. At a median follow-up of 91 months, the mean BMI decreased by 9.5 kg/m2, with satisfactory outcomes in terms of resolution of obesity-related diseases. IBD activity scores increased postoperatively, particularly in Crohn's disease (CD) patients, although these changes were not statistically significant. In addition, 30% of patients were hospitalized due to IBD exacerbation, and 15% required surgical intervention for IBD. Conclusions: MBS is an effective treatment for severe obesity and its related diseases in IBD patients. While encountering no major complications or mortality, some long-term complications were observed, with a possible increase in IBD activity, particularly in CD patients. Ongoing challenges, such as the risk of malnutrition, medication malabsorption, and postoperative IBD exacerbations, necessitate careful long-term follow-up.

Thunderstorms and their Influence on Meteorology and Atmospheric Composition Over Southern Peninsular India

The study examines the long-term (2011-2023) analysis of thunderstorm and lightning activities and their impacts on local meteorology and air pollutants over Bengaluru. The diurnal thunderstorm events occur mainly in the late evening hours (1900–2100 IST) and on monthly maximum in May while minimum in January. Annually, Bengaluru experiences an average of 41 thunderstorms and 157 lightning strikes, both of which have shown a statistically significant upward trend at a 95% confidence level. The rate of increase is 3.41% per year for thunderstorms and 3.3% per year for lightning events. Local temperatures coupled with abundant moisture supply from the southwest/northeast monsoon creates a favourable condition for the initiation of thunderstorms over the region. This study also focused on the trend analysis of meteorological parameters and atmospheric compositions, a rising trend were found in rainfall (1.44 mm year–1), RH (0.74% year–1) &amp; pressure (0.03 hPa year–1) whereas a slight declining trends in temperature (0.06 0C year-1) &amp; wind speed (-0.02 ms-1 year–1). As the availability of heat and humidity are two main prerequisites for the occurrence of thunderstorm and hence the probability of severe thunderstorms may increase in future. The AOD, NO2 &amp; O3 showed a significant increasing trend while no trend for SO2. The Pearson correlations showed the AOD, NO2 &amp; SO2 concentrations are significant negatively correlated with wind speed but positively correlated with atmospheric pressure. A further study indicated a significant impact of thunderstorm on the air pollutants has also been quantified and it was observed that PM2.5 concentration gradually decreases after the commencement of thunderstorm while quick increase response (less than 1 hour) was observed in O3 and delay response (after 2:30 hours) in NO2 which may linked to lightning activities. The results reveal that thunderstorms can affect both the local meteorology as well as atmospheric pollutants and vice-versa from regional to global.

Impedance mapping with high-density microelectrode array chips reveals dynamic heterogeneity of in vitro epithelial barriers

Epithelial tissues in vitro undergo dynamic changes while differentiating heterogeneously on the culture substrate. This gives rise to diverse cellular arrangements which are undistinguished by conventional analysis approaches, such as transepithelial electrical resistance measurement or permeability assays. In this context, solid substrate-based systems with integrated electrodes and electrochemical impedance monitoring capability can address the limited spatiotemporal resolution of traditional porous membrane-based methods. This label-free technique facilitates local, continuous, long-term analysis of tissue barrier properties for organ-on-chip applications. Increasing spatial resolution requires small electrodes arranged in a dense array, known as high-density microelectrode arrays (HD-MEAs). Integrated with Complementary Metal Oxide Semiconductor (CMOS) technology for multiplexing and rapid impedance measurements, HD-MEAs can enable high spatiotemporal resolution assessments of epithelial tissues. Here, we used 16,384 CMOS-integrated HD-MEA chip with subcellular-sized electrodes (8 μm diameter, 15 μm pitch, patterned in 16 clusters each consisting of 1024 electrodes in a 32 × 32 matrix) and impedance sensing capability to monitor dynamic evolution of Caco-2 cells, such as their proliferation, barrier formation, and 3D structure development on the chip. Changes in impedance at the selected frequency of 1 kHz (|Z|1kHz) enabled monitoring and analyzing the life cycle of Caco-2 cells grown on the HD-MEA chips (up to + 453% change after 7 days in culture). The |Z|1kHz maps of proliferating Caco-2 cells and the differentiating epithelial tissue developing 3D domes aligned with the corresponding optical images at cellular resolution, which demonstrates the capability of the chip in tracking the dynamic heterogeneity of Caco-2 tissues in a label free and real-time fashion. Importantly, |Z|1kHz maps acquired during chemically induced barrier disruption showed electrodes covered with 3D cell domes experienced a stronger decrease in impedance than those covered with adherent cells (-41% ± sd 10% against -16% ± sd 10%, respectively). This method could thus, in principle, enable detection of tissue barrier disrupting and modifying agents with higher specificity. Epithelial barrier function assays benefit from using HD-MEA impedance sensors due to their increased informativity and resolution, which will be of great value in future organ-on-chip platforms.

Quantitative determination of leptin hormone using gold nanoparticle-based lateral flow assay

A lateral flow assay (LFA) has been developed that can be used in point-of-care (PoC) use for the sensitive determination of leptin hormone. The limit of detection value was 0.158 ng/mL and the limit of quantification value was 0.479 ng/mL for leptin hormone. The stability studies showed that the assay response was equal to the initial value even after 6 months. LFA accuracy tests performed in commercial artificial serum samples were compared with the enzyme-linked immunosorbent assay (ELISA). The obtained recovery values between 95 and 110% show that the developed LFA can be used for quantitative determination of leptin hormone. As the result of the study, a fast and disposable assay was developed for the determination of leptin hormone, which can be performed with a small amount of sample in less than 15 min without the need for long-term analysis stages, qualified personnel, expensive equipment and devices.Graphical

Unlocking the Nexus: Tourism, Clean Energy, Innovation, and Environmental Sustainability in the Top 20 Tourist Nations.

This study investigates the interplay between tourism activities, renewable energy utilization, and environmental impacts by analyzing a panel of the top 20 tourism nations over the period from 2005 to 2020. This research is motivated by an increasing interest in the intersection of tourism, a significant economic driver, and the objectives of environmental sustainability. The discourse surrounding the impact of tourism on environmental health is substantial, particularly in relation to the adoption of renewable energy and the carbon footprint associated with the sector. The research posits that the advancement of tourism has a beneficial impact on the consumption of renewable energy, subsequently aiding in the promotion of environmental sustainability. This analysis delves into the dual impact of tourism, suggesting that while it has the potential to enhance the utilization of renewable energy, it may concurrently present challenges to the quality of the environment. The investigation utilizes sophisticated econometric modelling methodologies, namely the Cross-Sectional Autoregressive Distributed Lag (CS-ARDL) and Nonlinear Autoregressive Distributed Lag (NARDL) models, to analyze these relationships. The methodologies employed facilitate a comprehensive examination of both short-term and long-term impacts within the chosen nations throughout the designated timeframe. The results indicate a statistically significant and positive correlation between the development of tourism and the consumption of renewable energy, thereby reinforcing the hypothesis that an increase in tourism activity is associated with a rise in the utilization of clean energy sources. The observed relationship is consistent across both short-term and long-term analyses, indicating that tourism contributes positively to the adoption of renewable energy. The study reveals that tourism not only facilitates the integration of renewable energy but is also linked to environmental degradation, underscoring the imperative for sustainable practices. The research findings indicate that tourism has the potential to catalyze the adoption of renewable energy, presenting significant advantages for environmental sustainability.

Hybrid data-driven long-term wave analysis in the southern Coral Sea, Australia

Hybrid data-driven long-term wave analysis in the southern Coral Sea, Australia

Long-term energy management analysis of a novel solar thermoelectric generator based on photothermal conversion phase change materials in real-environment

Long-term energy management analysis of a novel solar thermoelectric generator based on photothermal conversion phase change materials in real-environment

Long-term stability analysis and failure mode of composite solid propellant: Experiment and modeling

Long-term stability analysis and failure mode of composite solid propellant: Experiment and modeling

Novel mixed matrix membranes with indium-based 2D and 3D MOFs as fillers and polysulfone for CO2/CH4 mixed gas separation.

To address the limitations of polymeric membranes, mixed matrix membranes for CO2 separation from biogas mixtures (CO2 and CH4) have been investigated utilizing various fillers. In this study, we investigated novel MMMs using 3D and 2D indium-based MOFs, MIL-68(In)-NH2 and In(aip)2, in a polysulfone polymer matrix. To confirm synthesis, both fillers were subjected to XRD and FTIR analysis, as well as FESEM characterization to assess their 2D and 3D structures. BET analysis revealed the pore size of MOFs. MMMs were characterized using XRD, FTIR, FESEM, and DSC to determine various membrane characteristics. MMMs were tested with CO2 : CH4 of 60 : 40 vol% to mimic the biogas mixture, and the CO2 permeability of 144 Barrer and 79.2 Barrer was obtained for 20 wt% In(aip)2/PSF membrane and 15 wt% MIL-68(In)-NH2/PSF membrane. The highest CO2/CH4 selectivities of 19.8 and 24.4 were obtained for 15 wt% MIL-68(In)-NH2/PSF MMM and 10 wt% In(aip)2/PSF MMM, respectively. The gas permeation findings of this study were compared with existing literature and long-term stability analysis was done to assess the performance of membranes for commercial standards.