Nanoscale Advances最新文献

{"title":"Lattice variation upon water adsorption in silica opals measured by <i>in situ</i> atomic force microscopy.","authors":"Francisco Gallego-Gómez, Eider Berganza, Miguel Morales, Álvaro Blanco, Cefe López, Agustina Asenjo, Miriam Jaafar","doi":"10.1039/d5na00127g","DOIUrl":"10.1039/d5na00127g","url":null,"abstract":"<p><p>Colloidal photonic crystals, or artificial opals, derive their unique optical properties from the periodic arrangement of their constituent particles. Central to the functionality of these materials is the precise control over their lattice parameter, which directly determines the photonic bandgap. Adsorption of environmental vapors may have a significant impact on the photonic response, most of which has been attributed to lattice variations. Here we aim to directly measure the arrangement and lattice parameter in opals made of silica spheres by using <i>in situ</i> atomic force microscopy (AFM) under changing ambient conditions. The periodicity of the opal structure offers a decisive advantage for such study, enabling the use of correlation tools for image processing. Opals having high mechanical stability (avoiding lattice distortions or sphere detachment during scanning) allow reliable AFM data and good analytical resolution. We show direct evidence of reversible lattice increments upon water adsorption, up to several nanometres in agreement with prior indirect estimates, which is compatible with swelling of the spheres due to filling of silica micropores.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11969375/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143795870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"β-Cyclodextrin and reduced graphene oxide loaded Ag-TiO₂ composites for enhanced photocatalytic oxidation of urea under sunlight.","authors":"Palak Soni, Bonamali Pal, Raj Kumar Das","doi":"10.1039/d5na00245a","DOIUrl":"https://doi.org/10.1039/d5na00245a","url":null,"abstract":"<p><p>Urea oxidation is important to increase agricultural growth, which can meet food requirements across the world. It is pivotal for converting nitrogen to nitrate that is usable by crops, thus preventing nitrogen loss to the atmosphere. This study focuses on improving the photodegradation efficiency of TiO₂ by incorporating β-CD (beta-cyclodextrin), RGO (reduced graphene oxide), and Ag to enhance nitrate conversion. FT-IR, DRS, PL, EDX, XRD, XPS, HR-TEM DLS, and FESEM were conducted to characterize these materials. Among all the catalysts, the quaternary composite, β-CD/Ag-TiO₂/RGO, exhibited superior performance, achieving an 86.2% degradation efficiency with a 27.8% nitrate yield under sunlight irradiation within 150 min of reaction time. Several factors contribute to the enhanced photoactivity of β-CD/Ag-TiO₂/RGO, including the high surface area and absorptive power of β-CD, the large electronic mobility of RGO, and the localized surface plasmonic resonance effect of Ag, extending the catalyst's response to visible light. An intriguing aspect of this study is the encapsulation of gaseous nitrogen into the hydrophobic interior cavity of β-CD, contributing to the enhancement of urea oxidation. These findings can be very substantial for both agriculturists and chemists, providing valuable insights into designing novel photocatalysts for improved urea oxidation, thereby enhancing agricultural productivity.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11973494/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143811886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A dual-functional nanogold tablet as a plasmonic and nanozyme sensor for point-of-care applications.","authors":"Zubi Sadiq, Seyed Hamid Safiabadi Tali, Maryam Mansouri, Sana Jahanshahi-Anbuhi","doi":"10.1039/d5na00082c","DOIUrl":"10.1039/d5na00082c","url":null,"abstract":"<p><p>Point-of-care (POC) devices provide on-site disease diagnosis, particularly in resource-limited settings. Despite considerable progress in POC testing, the availability of commercial devices remains limited, primarily due to challenges in detection sensitivity and portability. Furthermore, advancements in existing POC devices are essential to better meet the needs of end-users. Herein, we present a colorimetric dual-functional tablet sensor using dextran-gold nanoparticles (dAuNPs) to detect and quantify uric acid and glucose levels in urine. Our tablet sensor combines the plasmonic and nanozyme properties of dAuNPs, resulting in highly sensitive detection of both biomarkers. Interestingly, we fabricated the nanogold tablet directly from the dAuNP solution without the addition of any external stabilizer or tablet-forming reagent, thus naming it a direct tablet. An enzyme-free approach was employed for uric acid detection, providing a wide detection range of 0.00187-7.8 mM and a low detection limit of 0.0037 mM, attributed to the hydrogen bonding between dextran and uric acid. On the other hand, the unique nanozyme properties of dAuNPs exhibited exclusive POx-mimetic activity for glucose detection (<i>K</i> _m = 0.106 mM and <i>V</i> _max = 369.72 mM min^-1), with a lower detection limit of 0.625 mM. Our dual-functional tablet offers exceptional substrate selectivity for the colorimetric-chromogenic assay of both uric acid and glucose. This dual-functionality not only provides a highly sensitive, selective, and cost-effective detection strategy for resource-limited settings but also introduces a new avenue for designing customizable plasmonic-nanozyme nanogold tablet sensors as a powerful tool for rapid diagnosis.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11960780/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143772680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of cylindrical micelles assembled from amphiphilic β-peptides as antigen delivery nanostructures.","authors":"Clément Martin, Mélanie Côté-Cyr, Phuong Trang Nguyen, Denis Archambault, Steve Bourgault","doi":"10.1039/d5na00166h","DOIUrl":"10.1039/d5na00166h","url":null,"abstract":"<p><p>Supramolecular nanostructures assembled from synthetic peptides constitute promising scaffolds for the delivery of antigens for vaccine development. Amphiphilic peptides and self-assembling cross-β-peptides have been shown to promote cellular uptake of antigenic epitopes by antigen-presenting cells, to stimulate the innate immune system and to induce a robust antigen-specific humoral immune response. In this study, we evaluated the use of cylindrical micelles assembled from the amphiphilic β-peptide C16V3A3K3 as a vaccine nanoplatform, combining the properties of cross-β-sheet fibrils and micelles. The ectodomain of the matrix 2 protein (M2e) of the influenza A virus was conjugated with a tetra-Gly linker at the C-terminus of C16V3A3K3. The chimeric peptide assembled into biocompatible unbranched filaments that exposed the antigen on the surface, and these filaments were readily internalized by dendritic cells and activated the toll-like receptor 2/6. These cylindrical micelles induced a robust M2e-specific humoral immune response upon intramuscular immunization in mice without the need for co-administration with adjuvants. Although this strong humoral response did not translate into protection against a lethal infection with the H1N1 influenza virus, these cylindrical micelles assembled from amphiphilic β-peptides expand the repertoire of self-adjuvanted nanostructures to enhance antibody production against peptide epitopes.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11960782/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143772744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Analyzing the charge contributions of metal–organic framework derived nanosized cobalt nitride/carbon composites in asymmetrical supercapacitors","authors":"Vishal Shrivastav‡, Mansi‡, Prashant Dubey, Umesh K. Tiwari, Akash Deep, Wojciech Nogala and Shashank Sundriyal","doi":"10.1039/D5NA90017D","DOIUrl":"10.1039/D5NA90017D","url":null,"abstract":"<p >Correction for ‘Analyzing the charge contributions of metal–organic framework derived nanosized cobalt nitride/carbon composites in asymmetrical supercapacitors’ by Vishal Shrivastav <em>et al.</em>, <em>Nanoscale Adv.</em>, 2024, <strong>6</strong>, 4219–4229, https://doi.org/10.1039/D4NA00291A.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 8","pages":" 2381-2381"},"PeriodicalIF":4.6,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11923799/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143692746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MXene synthesis in a semi-continuous 3D-printed PVDF flow reactor†","authors":"Molly J. Clark, Alice E. Oakley, Nikolay Zhelev, Marina Carravetta, Thomas Byrne, Adrian M. Nightingale and Nuno Bimbo","doi":"10.1039/D4NA00991F","DOIUrl":"10.1039/D4NA00991F","url":null,"abstract":"<p >Two-dimensional transition metal carbides, nitrides and carbonitrides known as MXenes represent a promising class of functional materials for electrochemical energy storage, catalysis, electromagnetic shielding, and optoelectronics. Typical synthesis methods require highly concentrated acids and HF-containing or HF-forming chemicals, under batch conditions. Environmentally friendly, safe, efficient, and scalable synthesis methods for MXenes have been identified as the number one research challenge for MXene research over the next decade. Here we use flow chemistry to present a semi-continuous synthesis of Ti<small>₃</small>C<small>₂</small>T<small>_<em>z</em></small> in a custom 3D-printed reactor. The synthesis is safer and is the first step towards scalable methods, yielding fully etched MXenes with better removal of Al from the starting MAX phase compared to the equivalent batch procedure.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 8","pages":" 2166-2170"},"PeriodicalIF":4.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11934147/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-cell parallel plate mechanics by side-view optical microscopy-assisted atomic force microscopy†","authors":"Mingyang Yang, Yanqi Yang, Lianqing Liu and Mi Li","doi":"10.1039/D5NA00012B","DOIUrl":"10.1039/D5NA00012B","url":null,"abstract":"<p >The mechanical forces of individual cells are crucial for physiological and pathological processes, and particularly atomic force microscopy (AFM)-based force spectroscopy has become an important and widely used tool for single-cell mechanical measurements. Here, we present a single-cell parallel plate mechanical measurement method based on side-view optical microscopy-assisted AFM by using a wedged probe, which enables visualization of the uniaxial AFM force spectroscopy process of the cell in real time from the vertical cross-sectional view. With this method, AFM whole-cell compression assays with uniaxial loading forces were performed to quantify the Young's modulus of the entire cell, and the effects of experimental parameters (ramp rate of the AFM probe) and drugs (actin inhibitors) on the measured cell Young's modulus were examined. Additionally, by attaching a living cell to the parallel plate of the wedged probe, AFM-based uniaxial single-cell force spectroscopy (SCFS) assays were performed to measure the adhesion forces of individual cells. The study illustrates a promising approach for single-cell mechanical analysis, which will benefit the application of AFM-based force spectroscopy in the field of mechanobiology to reveal additional insights into the regulatory role of mechanical cues in life activities.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 8","pages":" 2158-2165"},"PeriodicalIF":4.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11931428/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave characterization of plasmonic antennas through electron energy loss spectroscopy.","authors":"Igor Getmanov, Qingxiao Wang, Heng Wang, Atif Shamim, Dalaver H Anjum","doi":"10.1039/d4na00960f","DOIUrl":"10.1039/d4na00960f","url":null,"abstract":"<p><p>The absence of suitable equipment has long hindered traditional microwave characterization of nano-antennas and their effective design at frequencies beyond several terahertz, limiting the exploration of the myriad applications of plasmonic antennas by the microwave engineering community and necessitating a paradigm shift in characterization methods. This work addresses this challenge by introducing a novel approach employing electron energy loss spectroscopy (EELS) to characterize input impedance and scattering parameters of plasmonic antennas from mid-infrared to optical frequencies. Central to this method is a newly developed theoretical framework that links electron energy loss probability with microwave scattering parameters, crucial for antenna design. We validated this approach through a study of a single plasmonic dipole, finding a good correspondence between the measured EEL spectra and our theoretical model, supported by our developed simulation model. Drawing upon this correlation, we proposed an algorithm for the reverse procedure of extracting <i>S</i>-parameters and input impedance from experimental EEL probability. Spatial profiles of input impedance and <i>S</i>-parameters for a single plasmonic dipole were experimentally characterized across the broad frequency spectrum ranging from 25 to 150 THz and compared with simulation results, revealing a robust correlation, particularly at resonant frequencies. Our non-contact method could serve as an alternative approach to microwave parameters characterization, functioning similarly to a vector network analyzer (VNA) but extending its capabilities to much higher frequencies, where VNAs are not available.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11949246/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the antimicrobial activity of chitosan- and curcumin-capped copper oxide nanostructures against multi-drug-resistant microorganisms.","authors":"Noura El-Kattan, Mostafa A Ibrahim, Ahmed N Emam, Khaled Metwally, Fady Sayed Youssef, Nourelhuda Ahmed Nassar, Ahmed S Mansour","doi":"10.1039/d4na00955j","DOIUrl":"10.1039/d4na00955j","url":null,"abstract":"<p><p>The emergence of multi-drug-resistant microorganisms presents a serious threat to infection control, for which new antimicrobial strategies are urgently needed. Herein, the antimicrobial activities of copper oxide nanoparticles capped with curcumin (Cur-CuO NPs) and copper oxide nanoparticles capped with chitosan (CS-CuO NPs) were investigated. They were prepared <i>via</i> the co-precipitation method. A total of 180 clinical ICU patients were found to have 70% Gram-negative and 30% Gram-positive isolates. Antimicrobial susceptibility testing indicated resistance of these isolates to 14 among the 21 tested antibiotics. Physicochemical properties of the curcumin-capped (Cur-CuO NPs) and chitosan-capped (CS-CuO NPs) copper oxide nanoparticles were identified using UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS), zeta-potential (<i>ζ</i>), and Fourier transform infrared (FT-IR) spectroscopy. Cur-CuO- and CS-CuO-NPs exhibited potent antimicrobial efficacy, wherein CS-CuO NPs were found to possess a lower minimum inhibitory concentration (MIC) (3.9-15.6 μg mL^-1) than Cur-CuO NPs (14.5-31.2 μg mL^-1). Biocompatibility assay showed that Cur-CuO NPs were safer with an IC₅₀ dose of 74.17 μg mL^-1 than CS-CuO NPs with an IC₅₀ dose of 41.01 μg mL^-1. Results revealed that the Cur-CuO- and CS-CuO-NPs have the potential to be safely used as effective antimicrobial agents in clinical applications at low concentrations (6.25-12.5 μg mL^-1).</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11962744/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143780533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive review on nano-fertilizers: preparation, development, utilization, and prospects for sustainable agriculture in Ethiopia","authors":"Eyasu Derbew Demeke, Natei Ermias Benti, Mintesnot Gizaw Terefe, Teshome Taye Anbessa, Wondimagegne Mamo Mengistu and Yedilfana Setarge Mekonnen","doi":"10.1039/D4NA01068J","DOIUrl":"10.1039/D4NA01068J","url":null,"abstract":"<p >With their many benefits including better crop yield and nutrient delivery, nano fertilizers are a promising option in the agriculture sector. The production and formulation of nanoparticles with regulated size, shape, and content are required to prepare nano fertilizers. Metals, metal oxides, and polymers are among the materials from which nanoparticles are made using chemical and physical processes. Subsequently, these nanoparticles are mixed into fertilizers to enhance plant absorption and availability of nutrients. Nano-fertilizers have several benefits, including efficient nutrient absorption, reduced nutrient losses, minimized environmental pollution, optimized resource utilization, and controlled release of nutrients for sustained plant nourishment. Studies have demonstrated that by boosting nutrient availability, encouraging root development, and strengthening stress tolerance, nano fertilizers can greatly enhance crop yields. Moreover, it has been discovered that they increase microbial activity and soil fertility, which improves soil health and long-term sustainability. Nano-fertilizers can be applied in different ways, like foliar spraying, seed coating, soil integration, or irrigation systems. They are beneficial in precision agriculture for better nutrient management, soil restoration, and addressing nutrient deficiencies. Furthermore, they potentially lessen the negative environmental effects of traditional fertilization methods. Nevertheless, there are still several issues that need to be resolved before nano fertilizers may be commercialized and widely used. Regulatory frameworks, environmental destiny, potential toxicity of nanoparticles, and cost-effectiveness are some of these challenges. The purpose of this review is to provide readers with a comprehensive understanding of the benefits of nano fertilizers. It will cover topics such as their preparation and characterization, potential side effects, and a diverse range of applications. Additionally, it will present an overview of the importation of chemical fertilizers and explore the prospects of utilizing fertilizers in the Ethiopian context.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 8","pages":" 2131-2144"},"PeriodicalIF":4.6,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11937909/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143730525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}