Nano-Structures & Nano-Objects最新文献

{"title":"2D-nanostructures as flame retardant additives: Recent progress in hybrid polymeric coatings","authors":"Supraja Sankeshi ,&nbsp;Jayasree Ganapathiraju ,&nbsp;Pooja Bajaj ,&nbsp;Madhu Krishna Mangali ,&nbsp;Syed Hussain Shaik ,&nbsp;Pratyay Basak","doi":"10.1016/j.nanoso.2024.101346","DOIUrl":"10.1016/j.nanoso.2024.101346","url":null,"abstract":"<div><div>The use of polymers in day-to-day life is undeniable; nevertheless, applicability of these polymers in the fire risk sector poses serious limitations as most of the polymeric materials/coatings employed are prone to fire. Hence to improve the fire retardant (FR) properties of polymers, researchers recommend the use of FR materials/additives, either physically blended or incorporated chemically <em>via</em> suitable modifications. However, to achieve sufficient FR property, usually higher amounts of traditional FRs are required which understandably deteriorates the mechanical and other important properties of the polymers. Moreover, use of halogenated FRs are under immense scrutiny due to the possible release of carcinogenic and organic pollutants. As a result development of halogen-free FRs is an emerging field of research. In this context, incorporation of nanostructured two-dimensional (2-D) materials to form polymer composites that can not only reinforce the mechanical, thermal and other important properties but also improve flame retardancy has opened up new prospects. The 2-D nanostructured materials, particularly, layered double hydroxide (LDH), MXenes, Graphene and its derivatives, Boron Nitride (BN) and molybdenum disulphide (MoS₂) have demonstrated capabilities to enhance the FR properties as a green and environmentally benign material. Incorporation of these 2-D materials into polymers to form nanohybrids can be achieved either as conventional filler or as surface modified systems chemically bonded to the parent matrix. In the present review, the recent development strategies of surface modifications employed on 2-D nanostructured materials (LDH, MXenes, GO, BN and/or MoS₂) to form polymeric nanocomposites and the FR properties achieved are discussed. The significant outcomes reported by various research groups, the key insights gained and viewpoints are deliberated. A plausible underlying mechanism for flame retardancy offered by 2-D nanostructured materials (LDH, MXenes, GO, BN and/or MoS₂) based polymer nanocomposites as extended by several research groups is discussed.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101346"},"PeriodicalIF":5.45,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356954","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}

{"title":"Analysis of thermal significances of nanofluids in inclined magnetized flow with Joule heating source and slip effects","authors":"Faisal Mumtaz ,&nbsp;Tasawar Abbas ,&nbsp;Adil Jhangeer ,&nbsp;Ijaz Ali","doi":"10.1016/j.nanoso.2024.101349","DOIUrl":"10.1016/j.nanoso.2024.101349","url":null,"abstract":"<div><div>The growing need for effective thermal management systems in engineering applications will improve performance by using nanofluids. Nanofluids, which show enhanced thermal characteristics compared to typical fluids, offer an effective way for heat transmission processes in industries. This study is particularly useful for systems where traditional fluids are insufficient for improving thermal performance. Understanding the overall impacts of Joule heating, magnetic fields, and slip conditions would be beneficial in fields such as aircraft, microelectronics, and biomedical engineering.</div><div>The thermal significances of nanofluids in an inclined magnetized flow are analyzed in this work, taking slip effects and the Joule heating source into account. The motivation behind the current research is to investigate the flow and heat transfer behavior of magnetohydrodynamic (MHD) nanofluid under the influence of Joule heating in the presence of slip conditions.</div><div>Based on conservation laws and suitable boundary conditions, the governing formulas for mass, momentum, energy, and nanoparticle concentration are developed. In this thermal investigation, unsteady nanofluid flow in two dimensions via a nonlinear stretched configuration is studied numerically together with an example of a non-uniform heat source. Using similarity transformation, the governing partial differential equation for chemical radiation and slip effects parameters for hydromagnetic flow is transformed into a set of ordinary differential equation (ODE). To solve these equations, a numerical method is applied. This study found that the velocity, mass transfer, temperature, concentration, heat transfer, and skin friction coefficient are significantly influenced by the chemical reaction, radiation parameter, and velocity slip. A graphical representation of the parameters influencing the heat transfer and the velocity changes in calculation is observed.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101349"},"PeriodicalIF":5.45,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356953","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}

{"title":"Nanomedicine breakthrough: Cyclodextrin-based nano sponges revolutionizing cancer treatment","authors":"Devesh U. Kapoor ,&nbsp;Rahul Garg ,&nbsp;Pushpendra Kumar Saini ,&nbsp;Mansi Gaur ,&nbsp;Bhupendra G. Prajapati","doi":"10.1016/j.nanoso.2024.101358","DOIUrl":"10.1016/j.nanoso.2024.101358","url":null,"abstract":"<div><div>Cyclodextrin based Nanosponges (““CDX” ”-“NSP”) is a versatile platform for cancer treatment. The unique advantages of “CDX”, such as biocompatibility, low surface area and the ability to form inclusion complexes. “CDX” is synthesized through a cross-linking process to create a three-dimensional network for encapsulating and protecting anticancer drugs. ““CDX” ” “NSP” can exhibit either a crystalline or amorphous structure, along with a spherical shape and notable swelling properties. These “NSP” can complex with a diverse range of molecules with a diverse range of lipophilic or hydrophilic molecules. Characterization techniques, including spectroscopy and morphological studies, ensure the reproducibility and reliability of “CDX” “NSP”, shedding light on their stability and drug-loading capabilities. The versatility of “CDX” “NSP” showcases its potential as a universal drug delivery platform adaptable to various malignancies.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101358"},"PeriodicalIF":5.45,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142356952","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}

{"title":"A comprehensive review on luminescent carbon dots and their polymer composites: Synthesis to applications","authors":"Archana Pandey,&nbsp;Vaishali Raikwar","doi":"10.1016/j.nanoso.2024.101339","DOIUrl":"10.1016/j.nanoso.2024.101339","url":null,"abstract":"<div><div>Due to their distinct versatility and application qualities, carbon dots (CDs) and their composite materials have become promising luminous materials in a variety of industries. We give a comprehensive summary of current progress in the synthesis, characterization, and uses of carbon dots and their composites in luminescence and other domains in this review. This review focuses on the types of carbon dots and characterization methods used to investigate different properties like luminescence, including time-resolved spectroscopy, UV-Vis spectroscopy, and fluorescence spectroscopy. Additionally, different techniques for creating carbon dots, such as top-down and bottom-up procedures, as well as how precursor materials, surface passivation, doping, and size management affect the luminous properties of carbon dots are all discussed. The next section focuses on formation of carbon dots/polymer composite materials. Additionally, we go over how to create and design these composites, emphasizing how to improve their usefulness, stability, and luminous qualities. Further, we provide a thorough overview of the uses for carbon dots and their composites in the area of luminescence, including those for LEDs, sensors, displays, and biomedicine. Carbon dots have many properties like low toxicity, photostability, biocompatibility, and tunable emission wavelengths, that make them desirable candidates for various applications. In addition, we emphasize the most recent debates and views in the area of carbon dots and their composites for luminous applications. A thorough understanding of the synthesis, characterization, and uses of carbon dots and carbon dots composite materials in luminescence and other domains is what this paper aims to accomplish. For those working in the fields of nanomaterials, optoelectronics, and photonics who want to exploit the potential of carbon dots and their composites for creating improved luminous materials and devices, it is a useful resource.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101339"},"PeriodicalIF":5.45,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322093","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}

{"title":"Comparative analysis of nano-additives for enhanced photocatalytic hydrogen production: A hybrid approach using MEREC and sensitivity methods","authors":"Tauseef Hassan ,&nbsp;Osama Khan ,&nbsp;Mohd Zaheen Khan ,&nbsp;Pratibha Kumari ,&nbsp;Mohd Parvez ,&nbsp;Azhar Equbal ,&nbsp;Taufique Ahamad","doi":"10.1016/j.nanoso.2024.101353","DOIUrl":"10.1016/j.nanoso.2024.101353","url":null,"abstract":"<div><div>Photocatalytic hydrogen production is a cutting-edge technology that offers a sustainable and efficient pathway for clean energy generation, crucial for mitigating the global energy crisis. This study specifically identified the most effective nano-additives for photocatalytic water splitting into hydrogen fuel, with a detailed evaluation of various nanocomposites. The analysis utilized the method based on the removal effects of criteria method to determine the importance of different performance parameters, prioritizing stability (27 %) and hydrogen production (26 %) as the most critical factors. Based on these weighted criteria, Graphene/TiO₂ was identified as the top-performing nano-additive, followed closely by g-C₃N₄/TiO₂ and Pt-TiO₂. The findings highlight that the superior charge separation, enhanced bandgap, and extensive surface area of Graphene/TiO₂ contribute significantly to its outstanding performance. Graphene/TiO₂ achieved the optimal outcomes with hydrogen production of 2100 μmol/g·h, a photocatalytic efficiency of 95 %, stability of 50 hours, and a cost-effectiveness of $15/g. Sensitivity analysis confirmed these results, emphasizing the robustness of these nanocomposites under varied conditions. The study's implications suggest that these advanced photocatalytic materials, can drive efficient hydrogen evolution, offering a scalable and environmentally friendly alternative to conventional fossil fuels.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101353"},"PeriodicalIF":5.45,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322092","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}

{"title":"Anti-cancer activity and optoelectronic properties via DFT calculations of rare-earth dually doped wurtzite-type ZnO nano-systems","authors":"Yassine Slimani ,&nbsp;Serkan Caliskan ,&nbsp;Firdos A. Khan ,&nbsp;Abdulhadi Baykal","doi":"10.1016/j.nanoso.2024.101348","DOIUrl":"10.1016/j.nanoso.2024.101348","url":null,"abstract":"<div><div>The application of zinc oxide (ZnO) in the biomedical field and electronic devices is attributed to its physical and chemical properties. In this research, a comprehensive investigation was performed to explore the role of Eu and Dy dual-doping on the electronic structure, optical characteristics, and anti-cancer capability of ZnO. The structural analysis using the XRD experiment demonstrated the formation of a wurtzite hexagonal structured ZnO phase for the undoped sample. The crystal structure was maintained but with a slight distortion of the system with the co-doping effect. The crystallite size disclosed a reduction with increasing the co-doping concentration. TEM and EDX analysis proved the formation of the desired compositions. In the theoretical part, the density functional theory (DFT) is adopted to probe the electronic structure and optical characteristics of proposed samples. The band gap energy (E_g) of undoped ZnO is found to be 3.45 eV. For the dual-doped systems, the E_g values reduced progressively as the content of co-dopants increased. A prominent absorption peak revealed in the UV regime for the undoped ZnO is shifted to lower energies upon doping, implying the band gap reduction. DFT results demonstrate that the impurity states due to rare earth dopants are important for optic/electronic characteristics and can be harnessed to develop photoelectric devices. According to the anti-cancer in vitro analysis, the prepared nanoparticles show strong cytotoxicity against HeLa and HCT-116 cells. The cell viability for colon cancer HCT-116 cells was C0 (37.18 %), C1 (31.96 %), C2 (64.27 %) and C3 (58.12 %), and the cell viability for cervical cancer HeLa cells was C0 (39.05 %), C1 (42.30 %), C2 (57.68 %), and C3 (45.29 %). Furthermore, DAPI staining indicated that the treatment with the Eu and Dy dual-doped ZnO NPs produced a cancer apoptotic cell death. The results of this work will be useful for further examination and choosing the appropriate nanomaterials for the targeted fields of applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101348"},"PeriodicalIF":5.45,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322091","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}

{"title":"Nanocurcumin: A new and improved way to fight cancer and infections","authors":"Kokkarachedu Varaprasad ,&nbsp;Natarajan Sisubalan ,&nbsp;Tippabattini Jayaramudu ,&nbsp;Murali M. Yallapu","doi":"10.1016/j.nanoso.2024.101352","DOIUrl":"10.1016/j.nanoso.2024.101352","url":null,"abstract":"<div><div>Nanoformulations of curcumin have garnered significant attention as a promising alternative for various health applications due to their enhanced properties over conventional curcumin formulations. Curcumin, a polyphenol organic antioxidant phytochemical extracted from turmeric, exhibits a wide range of therapeutic benefits but faces challenges such as limited solubility and bioavailability. Curcumin-based nanoformulations offer improved solubility, stability, and bioavailability, driving them a beneficial option for pharmaceutical delivery systems and targeted therapies. Recent studies have highlighted nanocurcumin as superior bacterial infections and have included multidrug-resistant strains. Moreover, nanocurcumin and its formulations show promise in cancer treatment by effectively inhibiting cancer cells and regulating key transcription factors. This review summarizes recent developments in nanocurcumin formulations and their potential in cancer therapy and antibacterial applications, emphasizing their role as innovative solutions for various health issues.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101352"},"PeriodicalIF":5.45,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142322090","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}

{"title":"Insight into the TiO2 nanostructures stabilized with cashew tree gum to remove emerging contaminants as a green technology","authors":"Marcelo Xisto Ribeiro ,&nbsp;Francisca P. Araujo ,&nbsp;Edson Cavalcanti da Silva-Filho ,&nbsp;Luciano C. Almeida ,&nbsp;Durcilene Alves da Silva ,&nbsp;Ramón R. Peña Garcia ,&nbsp;Juan Antonio Cecilia ,&nbsp;Marcelo Barbosa Furtini ,&nbsp;Josy A. Osajima ,&nbsp;Maria Del Mar Orta Cuevas","doi":"10.1016/j.nanoso.2024.101362","DOIUrl":"10.1016/j.nanoso.2024.101362","url":null,"abstract":"<div><div>Searching for technologies to combat emerging pollutants such as dyes and pharmaceuticals is arduous. Plant polysaccharides have been used to synthesize photocatalysts as strategies for green technology. The present study aimed to synthesize TiO₂ nanostructure photocatalytic using cashew tree gum. Structural, morphological, and optical characterization was carried out to verify the gum's effect on the growth of nanostructures. Photocatalytic tests were performed with Methylene dye (MB) and Ibuprofen (IBP) pollutants under UV irradiation. Structural characterization demonstrated the formation of anatase-type TiO₂, with a band gap at 3.15 eV. Photocatalytic assays using CGT showed that the material was more efficient in removing MB (43.17 %) when compared to IBP (29.86 %). In addition, scavenger studies indicated that electrons are the species involved in dye degradation. Therefore, the results are promising for using TiO₂ nanoparticles obtained with gum to remove pollutants.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101362"},"PeriodicalIF":5.45,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320063","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}

{"title":"Visible LED-light driven photocatalytic activity by a novel magnetically separable CoFe2O4/Mn3O4 nanocomposite","authors":"Vidit Pandey ,&nbsp;Sandeep Munjal ,&nbsp;Tufail Ahmad","doi":"10.1016/j.nanoso.2024.101351","DOIUrl":"10.1016/j.nanoso.2024.101351","url":null,"abstract":"<div><div>A novel magnetic separable CoFe₂O₄/Mn₃O₄ semiconductor catalyst was synthesized by sol-gel-cum-hydrothermal method, successfully. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman, and Fourier transformed infra-red spectrometers were used to characterize the prepared samples. Mn₃O₄ and CoFe₂O₄ exhibit in tetragonal and cubic phases, respectively. The obtained direct optical band gap of the samples belongs to the visible region. These catalysts were employed in photo-degradation of methylene blue (MB) dye under an LED visible light. Coupling of CoFe₂O₄ with Mn₃O₄, which formed type-II heterojunction, enhances the photocatalytic efficiency, provides magnetic separable features, and prevents the charge carriers’ recombination. Synthesized CoFe₂O₄/Mn₃O₄ nanocomposites show excellent photocatalytic activity with a high value of rate constant ∼ 0.03889 minute⁻¹. The scavenging test reveals that the holes and superoxide radicals were dominant reactive species in the degradation of dye. Magnetic separable feature of nanocomposite helps to recover the catalysts from degraded MB dye solution for the next photo-degradation cycles.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101351"},"PeriodicalIF":5.45,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320064","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}

{"title":"Biomedical applications of terbium oxide nanoparticles by Couroupita guianensis aubl leaves extract: A greener approach","authors":"P. Senthil Pandi ,&nbsp;P. Krishnan ,&nbsp;S. Sathish ,&nbsp;S. Sudhahar","doi":"10.1016/j.nanoso.2024.101341","DOIUrl":"10.1016/j.nanoso.2024.101341","url":null,"abstract":"<div><div>Couroupita guianensis aubl (CGA) is a plant known for its therapeutic characteristics and extensively used in biomedicine. This paper presents a method for synthesizing terbium oxide (Tb₂O₃) nanoparticles (NPs) utilizing the leaves extract of CGA which is sustainable and environmentally friendly. The practical synthesis of Tb₂O₃ NPs was validated using UV–vis analysis, revealing a prominent peak at 246 nm and the calculated band gap value of 3.02 eV. The existence of numerous functional groups and molecular bonding interactions in the Tb₂O₃ NPs was confirmed using FTIR spectrum analysis. In addition, the XRD examination confirmed that the nanoparticles had a crystalline structure with dimensions of 27.3 nm. The TEM imaging revealed the particle size of around 5.63 nm. The manufactured Tb₂O₃ NPs were analysed for anticancer capabilities against human MCF-7 cancer cell lines. Overall, our study emphasizes the ability of green-produced Tb₂O₃ NPs to be versatile agents with antidiabetic, antioxidant, and anticancer effects. These nanoparticles are potentially used in biomedical applications, providing long-lasting solutions to various health-related problems.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101341"},"PeriodicalIF":5.45,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142320065","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}