Journal of Nanoparticle Research最新文献

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Efficient removal of hexavalent chromium from wastewater using nano zerovalent iron 纳米零价铁高效去除废水中的六价铬
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-23 DOI: 10.1007/s11051-026-06637-7
Aatiqa Jabeen, Safeer Ahmed
{"title":"Efficient removal of hexavalent chromium from wastewater using nano zerovalent iron","authors":"Aatiqa Jabeen,&nbsp;Safeer Ahmed","doi":"10.1007/s11051-026-06637-7","DOIUrl":"10.1007/s11051-026-06637-7","url":null,"abstract":"<div><p>The nano zerovalent iron (NZVI) is synthesized in bare and polyethylene glycol (PEG)-stabilized forms. The results of XRD, UV–Vis spectroscopy, and FTIR analyses support the synthesis and stabilization of the nanomaterial by PEG in desired forms. The scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis revealed the formation of spherical nanoparticles (∼ 50 nm) and nanoplates (~ 20nm) morphology with ≥ 66% ZVI. To evaluate the performance of PEG-NZVI for wastewater treatment, adsorption, and reduction of Cr(VI), these processes are monitored using UV–Vis spectroscopy and cyclic voltammetry (CV). On the removal of Cr (VI), the impact of various parameters like adsorbent dose, initial Cr (VI) concentration, pH, interferents, and stabilizing agents is assessed. The reusability and stability of PEG-NZVI towards Cr (VI) removal are also established. The exceptional 100% removal of 10 ppm Cr (VI) from real water samples is achieved within 3 min, following second-order kinetics, under the conditions of PEG (6k)-NZVI = 0.16 g L<sup>−1</sup>, room temperature, and pH = 2.0. Even for higher amounts (25–100 ppm), the complete removal time is just 5 min. The Cr (VI) removal activity of the prepared iron-based adsorbents followed the order: PEG-NZVI (100%) &gt; bare NZVI (92.5%) &gt; powder ZVI (17.9%). The use of PEG-NZVI for the treatment of tannery wastewater clearly demonstrates the effectiveness of the proposed methodology.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computational analysis of electronic properties of carbon nano-onions and fullerenes with point defects 含点缺陷的碳纳米洋葱和富勒烯的电子特性计算分析
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-23 DOI: 10.1007/s11051-026-06642-w
Susana Margarita Montesino Castillo, Ronaldo R. Méndez Hernández, Daniel Codorniú Pujals, Maykel Márquez Mijares
{"title":"Computational analysis of electronic properties of carbon nano-onions and fullerenes with point defects","authors":"Susana Margarita Montesino Castillo,&nbsp;Ronaldo R. Méndez Hernández,&nbsp;Daniel Codorniú Pujals,&nbsp;Maykel Márquez Mijares","doi":"10.1007/s11051-026-06642-w","DOIUrl":"10.1007/s11051-026-06642-w","url":null,"abstract":"<div><p>This study investigates the influence of irra-diation-induced point defects: single vacancies, divacancies, and Stone-Wales defects on the electronic properties of carbon fullerenes (C<sub>60</sub>, C<sub>240</sub>, C<sub>540</sub>) and carbon nano-onions (C<sub>60</sub>@C<sub>240</sub>, C<sub>240</sub>@C<sub>540</sub>, C<sub>60</sub>@C<sub>240</sub>@C<sub>540</sub>). Using the Density Functional Tight Binding (DFTB) method, geometries were optimized, and defect formation energies were calculated. Key electronic properties, including density of states (DOS), charge density differences, HOMO-LUMO gaps, and electron diffusion pathways, were analyzed. Results reveal that defects significantly alter electronic states and structural stability, with divacancies near pentagonal regions driving geometric transformations. This work provides a computational framework for understanding radiation-induced defect dynamics in carbon nanomaterials, offering insights for applications in nanotechnology and materials science.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the influence of surfactants on the morphology and properties of Ni2P2O7 nanomaterials 表面活性剂对Ni2P2O7纳米材料形貌和性能影响的研究
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-21 DOI: 10.1007/s11051-026-06633-x
Kejie Zhang, Wanping Li, Hongyu Yuan, Jiaxun Zhang, Zhiping Zhou
{"title":"Study on the influence of surfactants on the morphology and properties of Ni2P2O7 nanomaterials","authors":"Kejie Zhang,&nbsp;Wanping Li,&nbsp;Hongyu Yuan,&nbsp;Jiaxun Zhang,&nbsp;Zhiping Zhou","doi":"10.1007/s11051-026-06633-x","DOIUrl":"10.1007/s11051-026-06633-x","url":null,"abstract":"<div><p>This article mainly investigates the effects of sodium dodecyl sulfate (SDS), hexadecyltrimethylammonium bromide (CTAB), and polyvinylpyrrolidone (PVP) on the morphology and photocatalytic performance of nickel pyrophosphate (Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>) nanomaterials. A series of nickel pyrophosphate nanomaterials were prepared using a simple hydrothermal method. With the increase of surfactant dosage, the morphology of Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub> (NP) nanomaterials gradually disperses, transforming from wheat-bundle-like swelling to needle-like flower clusters. Surfactants achieve stable dispersion of particle systems and reduce agglomeration phenomena through electrostatic interactions and steric hindrance effects, thereby improving the photocatalytic performance of NP nanomaterials. Photoelectrochemical tests indicate that NP-SDS 10 mM has the optimal photocurrent density. The photocatalytic degradation results showed that NP-SDS 10 mM sample had the highest degradation efficiency for tetracycline. The maximum degradation efficiency of NP-SDS 10 mM for tetracycline was 70%, which was 2.4 times that of pure NP nanomaterials. This study provides a new approach to improve the photocatalytic performance of nanomaterials by adjusting their morphology through the addition of surfactants.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Liquid temperature effect on Pt-Sn nanoparticle properties during plasma sputtering onto polyethylene glycol 液相温度对聚乙二醇等离子溅射Pt-Sn纳米颗粒性能的影响
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-21 DOI: 10.1007/s11051-026-06631-z
Aissatou Diop, Soumya Atmane, Dilane Kevine Tagueu, Eric Millon, Audrey Sauldubois, Nadjib Semmar, Loic Gimenez, Maxime Mikikian, Pascal Andreazza, Amaël Caillard
{"title":"Liquid temperature effect on Pt-Sn nanoparticle properties during plasma sputtering onto polyethylene glycol","authors":"Aissatou Diop,&nbsp;Soumya Atmane,&nbsp;Dilane Kevine Tagueu,&nbsp;Eric Millon,&nbsp;Audrey Sauldubois,&nbsp;Nadjib Semmar,&nbsp;Loic Gimenez,&nbsp;Maxime Mikikian,&nbsp;Pascal Andreazza,&nbsp;Amaël Caillard","doi":"10.1007/s11051-026-06631-z","DOIUrl":"10.1007/s11051-026-06631-z","url":null,"abstract":"<div><p>Pt-Sn nanoparticles were synthesized by magnetron sputtering of a 2-inch Pt<sub>0.8</sub>Sn<sub>0.2</sub> target into polyethylene glycol using an innovative reactor configuration designed for liquid-phase deposition. A comprehensive study was conducted to understand the influence of liquid temperature on the growth of nanoparticles under two conditions: (i) an <i>in situ</i> heating of the liquid during sputtering deposition using bain-marie bath and (ii) an <i>ex situ</i> post-deposition annealing under air of the nanoparticle-liquid suspension obtained after deposition. COMSOL multiphysics simulations have revealed that the temperature of the liquid critically determines the transport regime of sputtered species inside the liquid glycol thus affecting the nanoparticle formation pathways. Complementary structural and morphological characterisations, such as transmission electron microscopy, X-ray diffraction and small-angle X-ray scattering, demonstrate that temperature modulates particle size and size distribution. The <i>in situ</i> heating of the liquid during the growth promotes aggregation and the emergence of interparticle correlations but does not significantly modify the size distribution of the NPs. The <i>ex situ</i> annealing treatment up to 150 °C of the as-deposited NPs affects their organization in solution, lightly alters their intrinsic size and can induce structural and microstructural modifications of the NPs and particularly affect the elemental distribution of Pt and Sn. These results provide new insights into temperature-controlled synthesis of alloy nanoparticles in liquids.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11051-026-06631-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Decoding the interfacial synergy of Fe–Cu bimetallic nanoparticles for the concurrent removal of As(V) and Cr(VI) Fe-Cu双金属纳米颗粒界面协同去除As(V)和Cr(VI)的研究
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-20 DOI: 10.1007/s11051-026-06612-2
Karen Manquián-Cerda, Tamara Maldonado, Rubén Cuevas, Raúl Calderón, María Angélica Rubio, Nicolás Arancibia-Miranda
{"title":"Decoding the interfacial synergy of Fe–Cu bimetallic nanoparticles for the concurrent removal of As(V) and Cr(VI)","authors":"Karen Manquián-Cerda,&nbsp;Tamara Maldonado,&nbsp;Rubén Cuevas,&nbsp;Raúl Calderón,&nbsp;María Angélica Rubio,&nbsp;Nicolás Arancibia-Miranda","doi":"10.1007/s11051-026-06612-2","DOIUrl":"10.1007/s11051-026-06612-2","url":null,"abstract":"<div><p>Removing oxyanionic contaminants like arsenate (As(V)) and chromate (Cr(VI)) is challenging in water treatment because of their high mobility and toxicity. This study synthesised Fe–Cu bimetallic nanoparticles (BMNPs) via chemical reduction and characterised them to assess how composition affects pollutant removal. Structural analyses (SEM, TEM, XRD) showed heterogeneous nanoparticles with Fe<sup>0</sup>, Fe<sub>3</sub>O<sub>4</sub>, Cu<sup>0</sup>, and Cu₂O phases, indicating partially oxidised Fe–Cu interfaces. Adsorption kinetics for both oxyanions fit the pseudo-second-order model, suggesting surface interactions dominate removal. Equilibrium was described by the Langmuir model for single-component systems and the Freundlich model for multicomponent systems, indicating competitive adsorption. Thermodynamic analysis showed spontaneous interactions (ΔG° &lt; 0). Phosphate reduced As(V) retention, but Cr(VI) removal stayed efficient due to adsorption and partial reduction to Cr(III). The heterogeneous Fe–Cu structure affects adsorption and enables simultaneous removal of As(V) and Cr(VI) from water.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing the structural and surface chemistry of cobalt-doped β-MnO2 for the alkaline oxygen evolution reaction 碱性析氧反应中钴掺杂β-MnO2的结构和表面化学研究
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-17 DOI: 10.1007/s11051-026-06647-5
Matangi Chaitanya, Seethiraju D. Ramarao
{"title":"Probing the structural and surface chemistry of cobalt-doped β-MnO2 for the alkaline oxygen evolution reaction","authors":"Matangi Chaitanya,&nbsp;Seethiraju D. Ramarao","doi":"10.1007/s11051-026-06647-5","DOIUrl":"10.1007/s11051-026-06647-5","url":null,"abstract":"<div><p>The pristine β-MnO<sub>2</sub> (MO) and cobalt-doped β-MnO<sub>2</sub> (MCO_1 and MCO_2) were successfully prepared using a single-step hydrothermal technique. Powder X-ray diffraction studies confirm that the samples adopt tetragonal symmetry with a <i>P</i>4<sub>2</sub>/<i>mnm</i> (136) space group. Structural features, such as bond lengths, were obtained by performing Rietveld refinement on all the samples, which reveals the distorted nature (2 × 1.8175 Å, 4 × 1.9346 Å) of MnO<sub>6</sub> octahedra. FTIR studies on these samples revealed that the pristine β-MnO<sub>2</sub> displays well-defined absorption bands in the 400–900 cm<sup>−1</sup> range, which become weakened and broadened upon cobalt doping, which is likely due to local structural distortions. The morphology studies of these samples revealed the presence of rod-like nanostructures with dimensions in the range of 1 – 1.5 µm in length, and 120 – 250 nm in diameter. EDX analysis confirms the presence of all the constituent elements in proportionate amounts, and elemental mapping further demonstrates the uniform spatial distribution throughout the sample. XPS analysis reveals the coexistence of Mn<sup>3+</sup>/Mn<sup>4+</sup> and oxygen vacancies in these samples. Electrochemical water oxidation measurements on these samples reveal that pristine β-MnO<sub>2</sub> exhibits a better overpotential (760 mV at 10 mA/cm<sup>2</sup>) compared to cobalt-doped samples MCO_1 (760 mV) and MCO_2 (860 mV). However, upon cycling, the activity of pristine β-MnO<sub>2</sub> and MCO_2 observed to improve while the MCO_1 sample degraded upon cycling. These studies provide insights into improving the long-term stability and enhancing the OER kinetics in Mn-based metal oxides.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dual-functional CuO/Cr₂O₃ nanocomposite-modified electrode for paracetamol sensing and peroxymonosulfate-activated photocatalysis 双功能CuO/Cr₂O₃纳米复合修饰电极用于对乙酰氨基酚传感和过氧单硫酸盐活化光催化
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-17 DOI: 10.1007/s11051-026-06641-x
Jahnavi Hunasekatte Katamallappa, Jagadish Krishnegowda, Dhanyashree Savitha Vishwakumar, Rajendra Prasad Shivalingappa
{"title":"Dual-functional CuO/Cr₂O₃ nanocomposite-modified electrode for paracetamol sensing and peroxymonosulfate-activated photocatalysis","authors":"Jahnavi Hunasekatte Katamallappa,&nbsp;Jagadish Krishnegowda,&nbsp;Dhanyashree Savitha Vishwakumar,&nbsp;Rajendra Prasad Shivalingappa","doi":"10.1007/s11051-026-06641-x","DOIUrl":"10.1007/s11051-026-06641-x","url":null,"abstract":"<div><p>Addressing complex wastewater contamination necessitates the development of nanomaterials that integrate both photocatalytic activity and sensing functionality within one system. In this article, we report a novel CuO/Cr₂O₃ nanocomposite for both electrochemical sensing of paracetamol at very low concentrations and sunlight-driven photodegradation of methyl orange (MO) by PMS activation method. The nanocomposite was synthesized by hydrothermal approach and characterized by a range of analytical techniques. The material exhibited good crystallinity, a narrow band gap of 1.3 eV, and a high BET surface area of 180 m<sup>2</sup>/g, facilitating enhanced light absorption and greater active surface exposure. The photocatalytic efficiency was 95% degradation of methyl orange (20 ppm) using 0.5 g catalyst at pH 6, supported by a high kinetic rate constant of 4.89 × 10⁻<sup>2</sup> min⁻<sup>1</sup>. The improved activity is mainly attributed to the heterojunction at the CuO/Cr₂O₃ interface, which enhances charge separation and suppresses recombination, while the presence of peroxymonosulfate further promotes reactive species formation, leading to accelerated degradation. Electrochemical studies were carried out using a modified carbon paste-based electrode via cyclic voltammetry. Key parameters such as scan rate, pH, and analyte concentration were systematically optimized. A linear sensing response was obtained for paracetamol in the 2–20 μM range, with corresponding LOD and LOQ values of 20.8 μM and 69.2 μM, confirming the material’s applicability for low-concentration pharmaceutical detection. In conclusion, the synthesized CuO/Cr₂O₃ nanocomposite demonstrated promising characteristics, efficient photocatalytic activity, and potential applications in electrochemical sensing and environmental applications.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 5","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147686688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Folate-functionalized nitrogen-doped carbon dot for targeted glycyrrhizin delivery to gastric cancer cells 叶酸功能化氮掺杂碳点用于胃癌细胞靶向甘草酸递送
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-15 DOI: 10.1007/s11051-026-06608-y
Milad Edraki, Faten Divsar
{"title":"Folate-functionalized nitrogen-doped carbon dot for targeted glycyrrhizin delivery to gastric cancer cells","authors":"Milad Edraki,&nbsp;Faten Divsar","doi":"10.1007/s11051-026-06608-y","DOIUrl":"10.1007/s11051-026-06608-y","url":null,"abstract":"<div><p>Nitrogen-doped carbon dots (NCDs) with a mean size of 1.5 nm and zeta potential of −32.8 mV were synthesized using a hydrothermal method and then conjugated with glycyrrhizin (GA) through an amide bond to form the GA-NCD nanocomposite. Then, folic acid (FA) was attached to the GA-NCDs to create a tumor-targeting nanocomposite (FA-GA-NCDs) for specific delivery to gastric cancer cells (AGS cells). Nanocomposite had a size about 154.7 nm and zeta potential of −44.6 mV. The adsorption efficiency of GA and FA on NCDs was measured to be 53% and 60%, respectively. At pH 5.4, about 89.9% of the GA as an effective component was released after 8 h. The results demonstrated that the nanocomposite is particularly potent against Gram-positive strains compared to Gram-negative ones. In vitro MTT assay of FA-GA-NCDs displayed an IC<sub>50</sub> of 40 µg/mL in AGS cells compared to 100 µg/mL for pure NCDs, indicating a 2.5-fold enhancement in potency. Furthermore, flow cytometry results confirmed these findings, demonstrating that the FA-GA-NCDs effectively induced apoptosis and destruction of AGS cells. This nanocomposite combines drug delivery efficiency and tumor-specific recognition, offering a promising multifunctional approach for gastric cancer therapy.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Controlling particle aggregation behavior and crystallinity of TiO₂ nanoparticles in supercritical anti-solvent processing 超临界抗溶剂工艺中tio2纳米颗粒聚集行为和结晶度的控制
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-15 DOI: 10.1007/s11051-026-06636-8
Rajiv Kamaraj, Hansung Lee, Yi-Jen Huang, Yu-Wei Chang, Ruey-Chi Hsu, Byungmin Ahn
{"title":"Controlling particle aggregation behavior and crystallinity of TiO₂ nanoparticles in supercritical anti-solvent processing","authors":"Rajiv Kamaraj,&nbsp;Hansung Lee,&nbsp;Yi-Jen Huang,&nbsp;Yu-Wei Chang,&nbsp;Ruey-Chi Hsu,&nbsp;Byungmin Ahn","doi":"10.1007/s11051-026-06636-8","DOIUrl":"10.1007/s11051-026-06636-8","url":null,"abstract":"<div><p>Titanium dioxide (TiO₂) nanoparticles were synthesized via a supercritical anti-solvent (SAS) process using carbon dioxide (CO<sub>2</sub>) and isopropanol (IPA), and the relationships between processing conditions, particle aggregation, and crystallinity were systematically elucidated. The influence of reaction temperature, pressure, surfactant concentration, holding time, and depressurization rate were examined to establish a process–structure–crystallinity framework for SAS-derived TiO₂ nanoparticles. The results reveal that both aggregation state and crystallinity are predominantly determined during in-reactor particle formation, governed by the coupled effects of thermodynamics, interfacial phenomena, and kinetic processes. Elevated temperatures favor anatase-phase crystallization, whereas increased pressures promote particle aggregation and suppress crystallinity, which is attributed to reduced molecular diffusivity and enhanced collision frequency in the supercritical medium. Surfactant concentration exhibits a non-monotonic effect on dispersion behavior: insufficient surface coverage leads to poor stabilization. At the same time, excessive loading induces polymer-mediated bridging, with an intermediate concentration providing optimal dispersion. Holding time emerges as a critical kinetic parameter: short residence times favor nucleation-dominated particle formation, whereas prolonged residence promotes irreversible aggregation via condensation-driven necking. In contrast, depressurization rate and precursor concentration exert secondary influences within the studied parameter space. Thermal and surface characterization confirm high specific surface areas and residual surfactant incorporation, while post-synthesis calcination enhances crystallinity without fundamentally altering aggregation states established during SAS processing. Based on these findings, a qualitative process map, together with a conceptual framework and processing insights, is proposed for controlling aggregation and phase formation in SAS-derived TiO₂ nanoparticles.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Polyaniline/WO3/graphene nanocomposite–based chemi-resistive sensor for malaria detection from exhaled breath 基于聚苯胺/WO3/石墨烯纳米复合材料的化学电阻式呼出疟疾检测传感器
IF 2.6 4区 材料科学
Journal of Nanoparticle Research Pub Date : 2026-04-15 DOI: 10.1007/s11051-026-06618-w
M. S. Suma, P. Jisha, V. Saisha, M. Keerthana
{"title":"Polyaniline/WO3/graphene nanocomposite–based chemi-resistive sensor for malaria detection from exhaled breath","authors":"M. S. Suma,&nbsp;P. Jisha,&nbsp;V. Saisha,&nbsp;M. Keerthana","doi":"10.1007/s11051-026-06618-w","DOIUrl":"10.1007/s11051-026-06618-w","url":null,"abstract":"<div><p>Malaria remains a critical global health challenge, particularly in resource-limited regions where conventional blood–based diagnostic methods are invasive, time-consuming, and need trained personnel. In recent years, non-invasive detection through exhaled breath analysis has emerged as a promising alternative, as volatile organic compounds (VOCs) such as limonene, α-pinene, 3-carene, and m-cymene serve as potential biomarkers of malaria infection. In this study, a hybrid nanocomposite comprising polyaniline (PANI), tungsten trioxide (WO₃), and graphene was synthesized through in situ chemical polymerization and employed as an active sensing layer for exhaled breath–based malaria detection. The mutually enhancing combination of PANI’s high electrical conductivity, WO₃’s strong gas-sensing affinity, and graphene’s large surface area and charge transport efficiency significantly improved the sensor’s performance. The sensor demonstrated excellent sensitivity toward malaria biomarker VOCs such as limonene, α-pinene, 3-carene, and m-cymene with a detection limit as low as 0.1 ppm and a maximum sensitivity of 62.27% at 5 ppm. High selectivity was demonstrated, with only minimal responses observed for common breath VOCs including acetone, methanol, and ethanol. The sensor further demonstrated fast response and recovery times, excellent reproducibility across repeated test cycles, and sustained long-term stability under ambient conditions. Validation in real clinical environments demonstrated selective detection of malaria-infected samples, with complete absence of cross-response to dengue or leptospirosis. These results indicate that the polyaniline/WO₃/graphene nanocomposite sensor offers a robust, low-cost, and portable platform for real-time, non-invasive malaria diagnosis via exhaled breath analysis.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"28 4","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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