Pub Date : 2025-05-27DOI: 10.1016/j.jciso.2025.100141
Van-Hoa Nguyen , Hoa-Hung Lam , Minh-Tam K. Nguyen , Thi-An-Sa Do , Hong-Phuong Phan , Trung Dang-Bao
Adapting for a green and safe protocol, this work developed a straightforward polyol method for synthesizing spherical silver nanoparticles (AgNPs), with a median size of 12.2 nm in glycerol at a low temperature (60 °C). The multipurpose nature of glycerol, acting as both a reductant and an immobilizer, was explored, demonstrating the long-term stability of AgNPs in the resulting colloidal solution. The stability of AgNPs in glycerol was also contrasted with their stability in water and other polyols. The multiple applications of AgNPs in glycerol included their use as antibacterial agents (against both E. coli and S. aureus strains) and as an eco-friendly catalyst. At room temperature, the selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) obeyed a pseudo first-order kinetic model, exhibiting a rate constant of 0.1064 min−1. The kinetic and thermodynamic results confirmed that the rate-determining step involved an electron-transfer process from adsorbed hydrogen to 4-nitrophenolate on the AgNPs surface. Utilizing glycerol as a non-toxic solvent, this colloidal AgNPs solution can be easily stored and directly used without any additional purification.
{"title":"A clear-cut synthesis of silver nanoparticles using glycerol as a multipurpose medium toward catalytic hydrogenation and antibacterial","authors":"Van-Hoa Nguyen , Hoa-Hung Lam , Minh-Tam K. Nguyen , Thi-An-Sa Do , Hong-Phuong Phan , Trung Dang-Bao","doi":"10.1016/j.jciso.2025.100141","DOIUrl":"10.1016/j.jciso.2025.100141","url":null,"abstract":"<div><div>Adapting for a green and safe protocol, this work developed a straightforward polyol method for synthesizing spherical silver nanoparticles (AgNPs), with a median size of 12.2 nm in glycerol at a low temperature (60 °C). The multipurpose nature of glycerol, acting as both a reductant and an immobilizer, was explored, demonstrating the long-term stability of AgNPs in the resulting colloidal solution. The stability of AgNPs in glycerol was also contrasted with their stability in water and other polyols. The multiple applications of AgNPs in glycerol included their use as antibacterial agents (against both <em>E. coli</em> and <em>S. aureus</em> strains) and as an eco-friendly catalyst. At room temperature, the selective hydrogenation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) obeyed a pseudo first-order kinetic model, exhibiting a rate constant of 0.1064 min<sup>−1</sup>. The kinetic and thermodynamic results confirmed that the rate-determining step involved an electron-transfer process from adsorbed hydrogen to 4-nitrophenolate on the AgNPs surface. Utilizing glycerol as a non-toxic solvent, this colloidal AgNPs solution can be easily stored and directly used without any additional purification.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"19 ","pages":"Article 100141"},"PeriodicalIF":0.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170380","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 : 2025-05-13DOI: 10.1016/j.jciso.2025.100138
Aimê Gomes da Mata Kanzaki , Tiago de Sousa Araújo Cassiano , João Valeriano , Fabio Luis de Oliveira Paula , Leonardo Luiz e Castro
The standard DLVO theory offers a limited description of ionic-surfacted magnetic colloids in near aggregation regimes. Correcting the electrical double layer term for ionic surfactants is not enough to successfully simulate the systems. The correction of the van der Waals energy divergence at short interparticle distances is fundamental for proper Monte Carlo sampling of nanoparticles’ configurations. We compare different short-range interaction models and show that a more detailed model leads to Monte Carlo simulations that better match theoretical expectations. Studying the energy scaling with the number of particles, we observe a slight deviation from energy extensivity across all models, small but still detectable via Akaike’s information criterion. The more detailed model predicts a strong effect of particle-size dispersity on the transition between overall attraction and repulsion. More precise modeling can significantly affect numerical predictions, in particular, the effect of particle-size dispersity on the spatial structure of colloids with high volume fraction. This emphasizes the importance of nailing down better models for describing complex colloidal dispersions.
{"title":"Colloidal structure, energy extensivity and Monte Carlo sampling properties of improved short-range interaction models for surfactant-coated magnetic nanoparticles","authors":"Aimê Gomes da Mata Kanzaki , Tiago de Sousa Araújo Cassiano , João Valeriano , Fabio Luis de Oliveira Paula , Leonardo Luiz e Castro","doi":"10.1016/j.jciso.2025.100138","DOIUrl":"10.1016/j.jciso.2025.100138","url":null,"abstract":"<div><div>The standard DLVO theory offers a limited description of ionic-surfacted magnetic colloids in near aggregation regimes. Correcting the electrical double layer term for ionic surfactants is not enough to successfully simulate the systems. The correction of the van der Waals energy divergence at short interparticle distances is fundamental for proper Monte Carlo sampling of nanoparticles’ configurations. We compare different short-range interaction models and show that a more detailed model leads to Monte Carlo simulations that better match theoretical expectations. Studying the energy scaling with the number of particles, we observe a slight deviation from energy extensivity across all models, small but still detectable via Akaike’s information criterion. The more detailed model predicts a strong effect of particle-size dispersity on the transition between overall attraction and repulsion. More precise modeling can significantly affect numerical predictions, in particular, the effect of particle-size dispersity on the spatial structure of colloids with high volume fraction. This emphasizes the importance of nailing down better models for describing complex colloidal dispersions.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100138"},"PeriodicalIF":0.0,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098467","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 : 2025-05-05DOI: 10.1016/j.jciso.2025.100140
Amit Sharma, Sahil Singh, Khyati Sharma, Kamal Thakur, Khushbu Choudhary, Aastha Patial, Tamana, Vikas Dhiman
This study presents a comprehensive investigation into the synthesis of zinc oxide (ZnO) nanoparticles and lanthanum oxide (La2O3)/ZnO nanocomposites using Jatropha curcas latex, emphasizing a sustainable green chemistry methodology. Characterization techniques, including X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), and zeta sizer analysis, were employed to elucidate the crystalline structure, optical properties, morphology, and stability of the synthesized materials. The photocatalytic efficacy of the synthesized nanomaterials was rigorously evaluated for the solar-driven photocatalytic removal of methylene blue (MB) dye. Through systematic optimization, an optimal dosage of 3 mg/mL for the La2O3/ZnO nanocomposite was identified, demonstrating a significant enhancement in degradation efficiency over ZnO nanoparticles. Under these optimized conditions, the La2O3/ZnO catalyst achieved up to 87.71 % removal of MB (initial concentration of 10 mg/L in 100 mL) within 120 min of exposure to natural sunlight. Additionally, under UV irradiation, the MB solution exhibited an exceptional 95.16 % photodegradation, with an estimated rate constant of 0.03224 min−1 after 90 min of treatment with the La2O3/ZnO nanocomposite. To further assess the performance and applicability of the photocatalysts, recyclability studies, scavenger studies, and hot filtration tests were conducted, confirming the potential of eco-friendly La2O3/ZnO nanocomposites as effective agents for sustainable environmental remediation strategies. This research not only advances the field of photocatalysis but also contributes to the development of sustainable materials for pollution mitigation.
{"title":"Green approach to La2O3/ZnO nanocomposites synthesis via Jatropha curcas latex: Implications in photocatalysis","authors":"Amit Sharma, Sahil Singh, Khyati Sharma, Kamal Thakur, Khushbu Choudhary, Aastha Patial, Tamana, Vikas Dhiman","doi":"10.1016/j.jciso.2025.100140","DOIUrl":"10.1016/j.jciso.2025.100140","url":null,"abstract":"<div><div>This study presents a comprehensive investigation into the synthesis of zinc oxide (ZnO) nanoparticles and lanthanum oxide (La<sub>2</sub>O<sub>3</sub>)/ZnO nanocomposites using Jatropha curcas latex, emphasizing a sustainable green chemistry methodology. Characterization techniques, including X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), and zeta sizer analysis, were employed to elucidate the crystalline structure, optical properties, morphology, and stability of the synthesized materials. The photocatalytic efficacy of the synthesized nanomaterials was rigorously evaluated for the solar-driven photocatalytic removal of methylene blue (MB) dye. Through systematic optimization, an optimal dosage of 3 mg/mL for the La<sub>2</sub>O<sub>3</sub>/ZnO nanocomposite was identified, demonstrating a significant enhancement in degradation efficiency over ZnO nanoparticles. Under these optimized conditions, the La<sub>2</sub>O<sub>3</sub>/ZnO catalyst achieved up to 87.71 % removal of MB (initial concentration of 10 mg/L in 100 mL) within 120 min of exposure to natural sunlight. Additionally, under UV irradiation, the MB solution exhibited an exceptional 95.16 % photodegradation, with an estimated rate constant of 0.03224 min<sup>−1</sup> after 90 min of treatment with the La<sub>2</sub>O<sub>3</sub>/ZnO nanocomposite. To further assess the performance and applicability of the photocatalysts, recyclability studies, scavenger studies, and hot filtration tests were conducted, confirming the potential of eco-friendly La<sub>2</sub>O<sub>3</sub>/ZnO nanocomposites as effective agents for sustainable environmental remediation strategies. This research not only advances the field of photocatalysis but also contributes to the development of sustainable materials for pollution mitigation.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100140"},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916615","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 corrosion resistance of aluminum alloys is a critical factor limiting their application in aggressive environments, particularly those containing chloride ions. Aluminum 6061, despite its high strength-to-weight ratio, suffers from localized corrosion in such conditions. In this study, Ti, Ti-Ni, and Ti-Ni-N thin films were deposited on aluminum 6061 alloy using the DC sputtering method, followed by plasma nitriding for the Ti-Ni-N film. The results showed that the Ti-Ni film exhibited the best corrosion resistance of 3.64 × 10−4 mm/year, with the lowest icorr of 2.80 × 10−4 A/cm2 and the highest protection efficiency, due to the formation of a stable passive layer. The Ti-Ni-N film also demonstrated enhanced hardness of 392.4 HV, though with slightly higher surface roughness of 5.76 μm. This research contributes to the development of more durable coatings for aluminum alloys, providing improved corrosion resistance in chloride-rich environments.
铝合金的耐腐蚀性是限制其在腐蚀性环境中应用的关键因素，特别是在含有氯离子的环境中。尽管铝6061的强度重量比很高，但在这种条件下会受到局部腐蚀。本研究采用直流溅射法在6061铝合金上沉积Ti、Ti- ni和Ti- ni - n薄膜，然后对Ti- ni - n薄膜进行等离子渗氮处理。结果表明，Ti-Ni膜的耐蚀性能最佳，为3.64 × 10−4 mm/年，icorr最低，为2.80 × 10−4 A/cm2，由于形成了稳定的钝化层，其防护效率最高。Ti-Ni-N膜的硬度达到392.4 HV，但表面粗糙度略高，为5.76 μm。这项研究有助于开发更耐用的铝合金涂层，在富含氯化物的环境中提供更好的耐腐蚀性。
{"title":"Enhanced corrosion resistance of aluminum 6061 alloy using Ti-based thin films and plasma nitriding","authors":"Margono , Djarot B. Darmadi , Femiana Gapsari , Teguh Dwi Widodo , Bayu Mahdi Kartika","doi":"10.1016/j.jciso.2025.100139","DOIUrl":"10.1016/j.jciso.2025.100139","url":null,"abstract":"<div><div>The corrosion resistance of aluminum alloys is a critical factor limiting their application in aggressive environments, particularly those containing chloride ions. Aluminum 6061, despite its high strength-to-weight ratio, suffers from localized corrosion in such conditions. In this study, Ti, Ti-Ni, and Ti-Ni-N thin films were deposited on aluminum 6061 alloy using the DC sputtering method, followed by plasma nitriding for the Ti-Ni-N film. The results showed that the Ti-Ni film exhibited the best corrosion resistance of 3.64 × 10<sup>−4</sup> mm/year, with the lowest i<sub>corr</sub> of 2.80 × 10<sup>−4</sup> A/cm<sup>2</sup> and the highest protection efficiency, due to the formation of a stable passive layer. The Ti-Ni-N film also demonstrated enhanced hardness of 392.4 HV, though with slightly higher surface roughness of 5.76 μm. This research contributes to the development of more durable coatings for aluminum alloys, providing improved corrosion resistance in chloride-rich environments.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100139"},"PeriodicalIF":0.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886609","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 : 2025-04-24DOI: 10.1016/j.jciso.2025.100137
Manas Barai , Tanmay Dutta , Anuttam Patra
This study explores the selective flotation of carbonate minerals-dolomite, magnesite, and calcite using amino acid-based single- and double-headed collectors. The separation efficiency was evaluated using microflotation experiments, ζ potential measurements, UV–Vis spectroscopy, FTIR spectroscopy, and molecular modelling. The study aimed to understand how the molecular architecture of collectors influences their adsorption behaviour on mineral surfaces, leading to selective flotation.
Flotation recoveries were measured at both natural and pH 10.5 conditions. The monocarboxylate collector (C12GlyNa) demonstrated high but non-selective recovery across all three minerals. In contrast, the double-headed collector, disodium N-dodecyl aminomalonate (C12MalNa2), exhibited strong selectivity, particularly for magnesite, due to optimal geometric matching between its head groups and the Mg-Mg atomic distances on the mineral surface. The amount of collector adsorbed was determined by UV–Vis analysis, while FTIR confirmed surface adsorption through characteristic alkyl stretching bands. ζ potential measurements supported these findings, showing that increased adsorption led to greater negative charge development on mineral surfaces. Molecular modelling further revealed that selective adsorption occurs when the collector's head group spacing aligns with metal-metal distances on the mineral surface, enabling effective electrostatic interactions.
These results highlight the potential for designing tailored collectors based on molecular recognition principles, offering a pathway for more efficient and selective flotation of carbonate minerals.
{"title":"Selective flotation of carbonate minerals","authors":"Manas Barai , Tanmay Dutta , Anuttam Patra","doi":"10.1016/j.jciso.2025.100137","DOIUrl":"10.1016/j.jciso.2025.100137","url":null,"abstract":"<div><div>This study explores the selective flotation of carbonate minerals-dolomite, magnesite, and calcite using amino acid-based single- and double-headed collectors. The separation efficiency was evaluated using microflotation experiments, ζ potential measurements, UV–Vis spectroscopy, FTIR spectroscopy, and molecular modelling. The study aimed to understand how the molecular architecture of collectors influences their adsorption behaviour on mineral surfaces, leading to selective flotation.</div><div>Flotation recoveries were measured at both natural and pH 10.5 conditions. The monocarboxylate collector (C<sub>12</sub>GlyNa) demonstrated high but non-selective recovery across all three minerals. In contrast, the double-headed collector, disodium <em>N</em>-dodecyl aminomalonate (C<sub>12</sub>MalNa<sub>2</sub>), exhibited strong selectivity, particularly for magnesite, due to optimal geometric matching between its head groups and the Mg-Mg atomic distances on the mineral surface. The amount of collector adsorbed was determined by UV–Vis analysis, while FTIR confirmed surface adsorption through characteristic alkyl stretching bands. ζ potential measurements supported these findings, showing that increased adsorption led to greater negative charge development on mineral surfaces. Molecular modelling further revealed that selective adsorption occurs when the collector's head group spacing aligns with metal-metal distances on the mineral surface, enabling effective electrostatic interactions.</div><div>These results highlight the potential for designing tailored collectors based on molecular recognition principles, offering a pathway for more efficient and selective flotation of carbonate minerals.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100137"},"PeriodicalIF":0.0,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894967","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 : 2025-04-19DOI: 10.1016/j.jciso.2025.100136
M. Rebeca Sofiya Joice , Priya Ranjan Dev , E. Iyyappan , T. Manovah David , Nithya Thangavel , Bernaurdshaw Neppolian , P. Wilson
Photocatalytic hydrogen evolution driven via solar energy is an efficient and sustainable method for hydrogen synthesis. The use of titania (TiO2), an efficient photocatalyst in hydrogen generation, can be improved further by reducing the recombination rate of photoinduced charge carriers. In this context, WO3 is a viable material to boost TiO2 photoefficiency. In the present study, 1D TiO2 nanotube/WO3 nanorod (TN-WR) Step-scheme (S-scheme) heterojunction was fabricated via a facile impregnation method. XRD studies confirmed the anatase phase of TiO2 and the monoclinic phase of WO3. Morphological studies revealed the 1D microstructure of the nanocomposite with a mesoporous surface. UV-DRS and PL profiles displayed a bathochromic shift in wavelength signifying the activation of the nanocomposite in the visible region. XPS studies indicated the generation of defective sites in TiO2 upon incorporation of WO3. Thus, the novel 1D TN-WR S-scheme heterojunction nanocomposite demonstrates a remarkably high photocatalytic hydrogen generation rate of 1761 μmol g−1h−1. In order to investigate the role of morphology in hydrogen evolution, TiO2/WO3 nanocomposites with spherical morphologies were considered for comparison. This study provides a novel insight into the design of semiconductor heterojunction photocatalysts for efficient hydrogen evolution while avoiding the use of noble metals.
{"title":"Construction of novel step-scheme TiO2-WO3 nanostructured heterojunction towards morphology-driven enhancement of photocatalytic hydrogen evolution","authors":"M. Rebeca Sofiya Joice , Priya Ranjan Dev , E. Iyyappan , T. Manovah David , Nithya Thangavel , Bernaurdshaw Neppolian , P. Wilson","doi":"10.1016/j.jciso.2025.100136","DOIUrl":"10.1016/j.jciso.2025.100136","url":null,"abstract":"<div><div>Photocatalytic hydrogen evolution driven via solar energy is an efficient and sustainable method for hydrogen synthesis. The use of titania (TiO<sub>2</sub>), an efficient photocatalyst in hydrogen generation, can be improved further by reducing the recombination rate of photoinduced charge carriers. In this context, WO<sub>3</sub> is a viable material to boost TiO<sub>2</sub> photoefficiency. In the present study, 1D TiO<sub>2</sub> nanotube/WO<sub>3</sub> nanorod (TN-WR) Step-scheme (S-scheme) heterojunction was fabricated via a facile impregnation method. XRD studies confirmed the anatase phase of TiO<sub>2</sub> and the monoclinic phase of WO<sub>3</sub>. Morphological studies revealed the 1D microstructure of the nanocomposite with a mesoporous surface. UV-DRS and PL profiles displayed a bathochromic shift in wavelength signifying the activation of the nanocomposite in the visible region. XPS studies indicated the generation of defective sites in TiO<sub>2</sub> upon incorporation of WO<sub>3</sub>. Thus, the novel 1D TN-WR S-scheme heterojunction nanocomposite demonstrates a remarkably high photocatalytic hydrogen generation rate of 1761 μmol g<sup>−1</sup>h<sup>−1</sup>. In order to investigate the role of morphology in hydrogen evolution, TiO<sub>2</sub>/WO<sub>3</sub> nanocomposites with spherical morphologies were considered for comparison. This study provides a novel insight into the design of semiconductor heterojunction photocatalysts for efficient hydrogen evolution while avoiding the use of noble metals.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100136"},"PeriodicalIF":0.0,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874295","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 : 2025-03-28DOI: 10.1016/j.jciso.2025.100135
Jin Hau Lew , Omar K. Matar , Erich A. Müller , Adrielle Sousa Santos , Myo Thant Maung Maung , Paul F. Luckham
This paper discusses a comprehensive three-part experimental study on the consolidation of calcium carbonate (CaCO3) via hydrolysed polyacrylamide (HPAM). The first part involves the consolidation ability of HPAM on CaCO3 investigated under room conditions. The setups in this work are dilute (1:25 mass ratio of CaCO3 to HPAM) and concentrated (1:2 mass ratio) colloidal systems, and an incubation of Iceland spar calcite crystal in dilute HPAM solution. UV–Vis absorption, zeta potential, oscillatory rheology in the form of storage modulus (G’), unconfined compression stress (UCS), and atomic force microscopy (AFM) force mapping, reveal positive interactions and increased consolidation with higher HPAM dosage, up to an optimum level. The second part explores the impact of reservoir conditions, namely salinity and temperature, on the consolidating ability of HPAM. Salinity tests indicate a higher polymer dosage requirement under increased salt concentration to maintain optimum CaCO3 consolidation, while temperature tests show a reduction in peak mechanical strength of consolidated CaCO3 samples. In the final part, the preservation of the effectiveness of deploying HPAM in reservoir conditions by crosslinking it with silica nanoparticles (SiONP) is explored. The results from G′ and UCS analyses demonstrate that CaCO3 consolidated by crosslinked HPAM retains peak mechanical strength even when treated with brine and subjected to continuous heating for three days. This extensive investigation into the consolidation of CaCO3 by HPAM provides valuable insights into the potential use of HPAM for strengthening reservoir rocks, with the novel approach of crosslinking showing promise for preserving its usability in challenging reservoir conditions.
{"title":"Consolidation of carbonates using hydrolysed polyacrylamide: Effect of temperature, pressure, salinity, and nanoparticle crosslinking","authors":"Jin Hau Lew , Omar K. Matar , Erich A. Müller , Adrielle Sousa Santos , Myo Thant Maung Maung , Paul F. Luckham","doi":"10.1016/j.jciso.2025.100135","DOIUrl":"10.1016/j.jciso.2025.100135","url":null,"abstract":"<div><div>This paper discusses a comprehensive three-part experimental study on the consolidation of calcium carbonate (CaCO<sub>3</sub>) via hydrolysed polyacrylamide (HPAM). The first part involves the consolidation ability of HPAM on CaCO<sub>3</sub> investigated under room conditions. The setups in this work are dilute (1:25 mass ratio of CaCO<sub>3</sub> to HPAM) and concentrated (1:2 mass ratio) colloidal systems, and an incubation of Iceland spar calcite crystal in dilute HPAM solution. UV–Vis absorption, zeta potential, oscillatory rheology in the form of storage modulus (G’), unconfined compression stress (UCS), and atomic force microscopy (AFM) force mapping, reveal positive interactions and increased consolidation with higher HPAM dosage, up to an optimum level. The second part explores the impact of reservoir conditions, namely salinity and temperature, on the consolidating ability of HPAM. Salinity tests indicate a higher polymer dosage requirement under increased salt concentration to maintain optimum CaCO<sub>3</sub> consolidation, while temperature tests show a reduction in peak mechanical strength of consolidated CaCO<sub>3</sub> samples. In the final part, the preservation of the effectiveness of deploying HPAM in reservoir conditions by crosslinking it with silica nanoparticles (SiONP) is explored. The results from G′ and UCS analyses demonstrate that CaCO<sub>3</sub> consolidated by crosslinked HPAM retains peak mechanical strength even when treated with brine and subjected to continuous heating for three days. This extensive investigation into the consolidation of CaCO<sub>3</sub> by HPAM provides valuable insights into the potential use of HPAM for strengthening reservoir rocks, with the novel approach of crosslinking showing promise for preserving its usability in challenging reservoir conditions.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100135"},"PeriodicalIF":0.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-25DOI: 10.1016/j.jciso.2025.100134
Sk Enamul , Surender Ontela
The applications of fluid dynamics and heat transfer between coaxial double-rotating disks are diverse and crucial across various engineering and scientific fields. This study is motivated by the growing need for efficient thermal management in advanced engineering applications, such as cooling systems, energy storage, and magnetohydrodynamic technologies. The research focuses on the heat transfer characteristics and entropy analysis of the flow of a second-grade hybrid nanofluid between two spinning porous disks, incorporating the effects of Hall currents, viscous dissipation, and thermal convective boundaries. The hybrid nanofluid consists of titanium dioxide and cobalt ferrite nanoparticles suspended in engine oil. The governing equations are transformed into non-dimensional forms using a similarity transformation and solved with the semi-analytical homotopy analysis method. Results reveal the effects of parameters on velocity, temperature profiles, Nusselt number, skin friction, entropy generation, and the Bejan number graphically. Notably, the temperature profile improves with increases in the Brinkman number and the thermal Biot number of the lower disk. In contrast, skin friction decreases with higher titanium dioxide volume fraction, porosity parameter, and magnetic field parameter. The heat transfer rate increases with a higher nanoparticle shape factor and magnetic field parameter. These findings offer significant implications for optimizing the thermal performance of nanofluids, particularly in advanced cooling systems, thermal energy storage, and magnetohydrodynamic applications where enhanced heat transfer and efficient thermal management are critical.
{"title":"Entropy analysis of Hall-effect-driven TiO2−CoFe2O4/ engine oil-based hybrid nanofluid flow between spinning porous disks with thermal convective boundaries","authors":"Sk Enamul , Surender Ontela","doi":"10.1016/j.jciso.2025.100134","DOIUrl":"10.1016/j.jciso.2025.100134","url":null,"abstract":"<div><div>The applications of fluid dynamics and heat transfer between coaxial double-rotating disks are diverse and crucial across various engineering and scientific fields. This study is motivated by the growing need for efficient thermal management in advanced engineering applications, such as cooling systems, energy storage, and magnetohydrodynamic technologies. The research focuses on the heat transfer characteristics and entropy analysis of the flow of a second-grade hybrid nanofluid between two spinning porous disks, incorporating the effects of Hall currents, viscous dissipation, and thermal convective boundaries. The hybrid nanofluid consists of titanium dioxide and cobalt ferrite nanoparticles suspended in engine oil. The governing equations are transformed into non-dimensional forms using a similarity transformation and solved with the semi-analytical homotopy analysis method. Results reveal the effects of parameters on velocity, temperature profiles, Nusselt number, skin friction, entropy generation, and the Bejan number graphically. Notably, the temperature profile improves with increases in the Brinkman number and the thermal Biot number of the lower disk. In contrast, skin friction decreases with higher titanium dioxide volume fraction, porosity parameter, and magnetic field parameter. The heat transfer rate increases with a higher nanoparticle shape factor and magnetic field parameter. These findings offer significant implications for optimizing the thermal performance of nanofluids, particularly in advanced cooling systems, thermal energy storage, and magnetohydrodynamic applications where enhanced heat transfer and efficient thermal management are critical.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100134"},"PeriodicalIF":0.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hybrid nanofluids containing carbon nanotubes possess the potential to augment thermal conductivity and are also employed in heat management applications. These nanofluids combine two kinds of nanostructures (single-wall and multi-wall) and have better energy conversion, cooling, and heat transmission qualities. Because of their tiny size and strength, carbon nanotubes (CNT) are used to increase machinery and components lubrication and boost system energy storage and charging cycle effectiveness of lithium-ion batteries. Therefore, a mathematical model is formulated to study the hydromagnetic CNT hybrid nanofluid mixed convective flow past an elongating porous surface in the occurrence of external heat source, thermal linear radiation, viscous and Joule dissipation. The nanoparticle diameter and interfacial layer effects are explored by incorporating the Gharesim dynamic viscosity model and Hamilton–Crosser thermal conductivity model. The partial differential equations (PDEs) defining the considered fluid flow are transformed into ordinary differential Equations (ODEs) utilizing predefined similarity transformations. The numerical Runge-Kutta method and shooting procedure are employed to obtain the outcomes. The current study establishes that the liquid momentum is controlled for the slip flow, thus with the slip condition, the amount of retardation is much higher in comparison with the no-slip condition, and the temperature of the hybrid nanofluid has been raised by a greater heat source coefficient and radiation factor. Further, the sensitivity and optimization analysis of the heat transmission rate is carried out using RSM with face-centered central composite design model of experiments. Sensitivity analysis reveals that the highest evaluated value 0.006330 of heat transmission rate is identified at the uncoded values and the least value −0.002590 is identified at the uncoded values of
{"title":"Heat transfer optimization in magnetohydrodynamic buoyancy-driven convective hybrid nanofluid with carbon nanotubes over a slippery rotating porous surface","authors":"Thirupathi Thumma , Surender Ontela , Devarsu Radha Pyari , S.R. Mishra , Subhajit Panda","doi":"10.1016/j.jciso.2025.100132","DOIUrl":"10.1016/j.jciso.2025.100132","url":null,"abstract":"<div><div>Hybrid nanofluids containing carbon nanotubes possess the potential to augment thermal conductivity and are also employed in heat management applications. These nanofluids combine two kinds of nanostructures (single-wall and multi-wall) and have better energy conversion, cooling, and heat transmission qualities. Because of their tiny size and strength, carbon nanotubes (CNT) are used to increase machinery and components lubrication and boost system energy storage and charging cycle effectiveness of lithium-ion batteries. Therefore, a mathematical model is formulated to study the hydromagnetic CNT hybrid nanofluid mixed convective flow past an elongating porous surface in the occurrence of external heat source, thermal linear radiation, viscous and Joule dissipation. The nanoparticle diameter and interfacial layer effects are explored by incorporating the Gharesim dynamic viscosity model and Hamilton–Crosser thermal conductivity model. The partial differential equations (PDEs) defining the considered fluid flow are transformed into ordinary differential Equations (ODEs) utilizing predefined similarity transformations. The numerical Runge-Kutta method and shooting procedure are employed to obtain the outcomes. The current study establishes that the liquid momentum is controlled for the slip flow, thus with the slip condition, the amount of retardation is much higher in comparison with the no-slip condition, and the temperature of the hybrid nanofluid has been raised by a greater heat source coefficient and radiation factor. Further, the sensitivity and optimization analysis of the heat transmission rate is carried out using RSM with face-centered central composite design model of experiments. Sensitivity analysis reveals that the highest evaluated value 0.006330 of heat transmission rate is identified at the uncoded values <span><math><mrow><msub><mi>ϕ</mi><mtext>SWCNT</mtext></msub><mo>=</mo><mn>0.01</mn><mo>,</mo><msub><mi>ϕ</mi><mtext>MWCNT</mtext></msub><mo>=</mo><mn>0.01</mn><mo>,</mo><mi>N</mi><mo>=</mo><mn>0.10</mn></mrow></math></span> and the least value −0.002590 is identified at the uncoded values of <span><math><mrow><msub><mi>ϕ</mi><mtext>SWCNT</mtext></msub><mo>=</mo><mn>0.01</mn><mo>,</mo><msub><mi>ϕ</mi><mtext>MWCNT</mtext></msub><mo>=</mo><mn>0.03</mn><mo>,</mo><mi>N</mi><mo>=</mo><mn>0.10</mn></mrow></math></span></div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100132"},"PeriodicalIF":0.0,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-19DOI: 10.1016/j.jciso.2025.100133
Ralitsa I. Uzunova , Krassimir D. Danov , Rumyana D. Stanimirova , Theodor D. Gurkov
The class of volatiles, which possess low saturated vapor pressures, appreciable solubilities in water, and well pronounced surface activities, have gained wide applications in diverse areas of industry, cosmetics, and medicine. One way to qualitatively characterize their mass transfer between vapor and aqueous solutions is to measure the relaxation of the interfacial tension, σ, with time, t, under different nonequilibrium initial conditions. This approach is applied in the present work for geraniol and menthol. By means of combining σ(t) data with the respective equilibrium surface tension isotherms, the instantaneous values of the fragrance adsorption, Γ(t), have been determined. Quantitative characterization of the geraniol and menthol mass transfers in the case of adsorption from vapor to aqueous drops is achieved by using a mixed barrier-diffusion model. The obtained values of the rates of adsorption and desorption are compared with those reported in the literature for benzyl acetate, linalool, and citronellol. In the case of evaporation of the volatiles from their saturated aqueous solutions to the ambient atmosphere, the mass transfer is found to be driven both by mixed barrier-diffusion and by convection-enhanced mechanisms – depending on the air humidity. The quantitative description of the evaporation of volatile molecules is modelled theoretically by adsorption rate constants. In order to achieve the reported model representations, complex numerical calculations are implemented. On the other hand, having in mind the cases when one wishes to avoid extensive computational work, we developed a simple semiempirical model suitable for all five studied fragrances. This simplified approach is convenient for the express comparison and characterization of the evaporation rates. The obtained physicochemical parameters related to the evaporation and condensation of volatiles are important for the rigorous modeling of their complex mixed solutions of practical interest. The semiempirical model could be used for the quantitative classification of volatile molecules with respect to their ability to evaporate.
{"title":"Quantitative characterization of the mass transfer of volatile amphiphiles between vapor and aqueous phases: Experiment vs theory","authors":"Ralitsa I. Uzunova , Krassimir D. Danov , Rumyana D. Stanimirova , Theodor D. Gurkov","doi":"10.1016/j.jciso.2025.100133","DOIUrl":"10.1016/j.jciso.2025.100133","url":null,"abstract":"<div><div>The class of volatiles, which possess low saturated vapor pressures, appreciable solubilities in water, and well pronounced surface activities, have gained wide applications in diverse areas of industry, cosmetics, and medicine. One way to qualitatively characterize their mass transfer between vapor and aqueous solutions is to measure the relaxation of the interfacial tension, <em>σ</em>, with time, <em>t</em>, under different nonequilibrium initial conditions. This approach is applied in the present work for geraniol and menthol. By means of combining <em>σ</em>(<em>t</em>) data with the respective equilibrium surface tension isotherms, the instantaneous values of the fragrance adsorption, Γ(<em>t</em>), have been determined. Quantitative characterization of the geraniol and menthol mass transfers in the case of adsorption from vapor to aqueous drops is achieved by using a mixed barrier-diffusion model. The obtained values of the rates of adsorption and desorption are compared with those reported in the literature for benzyl acetate, linalool, and citronellol. In the case of evaporation of the volatiles from their saturated aqueous solutions to the ambient atmosphere, the mass transfer is found to be driven both by mixed barrier-diffusion and by convection-enhanced mechanisms – depending on the air humidity. The quantitative description of the evaporation of volatile molecules is modelled theoretically by adsorption rate constants. In order to achieve the reported model representations, complex numerical calculations are implemented. On the other hand, having in mind the cases when one wishes to avoid extensive computational work, we developed a simple semiempirical model suitable for all five studied fragrances. This simplified approach is convenient for the express comparison and characterization of the evaporation rates. The obtained physicochemical parameters related to the evaporation and condensation of volatiles are important for the rigorous modeling of their complex mixed solutions of practical interest. The semiempirical model could be used for the quantitative classification of volatile molecules with respect to their ability to evaporate.</div></div>","PeriodicalId":73541,"journal":{"name":"JCIS open","volume":"18 ","pages":"Article 100133"},"PeriodicalIF":0.0,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号