Nanomaterials最新文献_第6页

Silver Nanoparticles and Simvastatin-Loaded PLGA-Coated Hydroxyapatite/Calcium Carbonate Scaffolds. 银纳米粒子和辛伐他汀包覆的聚乳酸羟基磷灰石/碳酸钙支架

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-12 DOI: 10.3390/nano14201637

Morena Nocchetti, Chiara Piccotti, Michela Piccinini, Silvia Caponi, Maurizio Mattarelli, Donatella Pietrella, Alessandro Di Michele, Valeria Ambrogi

{"title":"Silver Nanoparticles and Simvastatin-Loaded PLGA-Coated Hydroxyapatite/Calcium Carbonate Scaffolds.","authors":"Morena Nocchetti, Chiara Piccotti, Michela Piccinini, Silvia Caponi, Maurizio Mattarelli, Donatella Pietrella, Alessandro Di Michele, Valeria Ambrogi","doi":"10.3390/nano14201637","DOIUrl":"https://doi.org/10.3390/nano14201637","url":null,"abstract":"The need to develop synthetic bone substitutes with structures, properties, and functions similar to bone and capable of preventing microbial infections is still an ongoing challenge. This research is focused on the preparation and characterization of three-dimensional porous scaffolds based on hydroxyapatite (HA)-functionalized calcium carbonate loaded with silver nanoparticles and simvastatin (SIMV). The scaffolds were prepared using the foam replica method, with a polyurethane (PU) sponge as a template, followed by successive polymer removal and sintering. The scaffolds were then coated with poly(lactic-co-glycolic) acid (PLGA) to improve mechanical properties and structural integrity, and loaded with silver nanoparticles and SIMV. The scaffolds were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), ATR FT-IR, and silver and SIMV loading. Moreover, the samples were analyzed by Brillouin and Raman microscopy. Finally, in vitro bioactivity, SIMV and silver release, and antimicrobial activity against Staphylococcus aureus and Staphylococcus epidermidis were evaluated. From the Brillouin spectra, samples showed characteristics analogous to those of bone tissue. They exhibited new hydroxyapatite growth, as evidenced by SEM, and good antimicrobial activity against the tested bacteria. In conclusion, the obtained results demonstrate the potential of the scaffolds for application in bone repair.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510553/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142516485","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}

引用次数: 0

Influence of Synthesis Parameters on Structure and Characteristics of the Graphene Grown Using PECVD on Sapphire Substrate. 合成参数对在蓝宝石衬底上使用 PECVD 法生长的石墨烯的结构和特性的影响。

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-12 DOI: 10.3390/nano14201635

Šarūnas Jankauskas, Šarūnas Meškinis, Nerija Žurauskienė, Asta Guobienė

{"title":"Influence of Synthesis Parameters on Structure and Characteristics of the Graphene Grown Using PECVD on Sapphire Substrate.","authors":"Šarūnas Jankauskas, Šarūnas Meškinis, Nerija Žurauskienė, Asta Guobienė","doi":"10.3390/nano14201635","DOIUrl":"https://doi.org/10.3390/nano14201635","url":null,"abstract":"The high surface area and transfer-less growth of graphene on dielectric materials is still a challenge in the production of novel sensing devices. We demonstrate a novel approach to graphene synthesis on a C-plane sapphire substrate, involving the microwave plasma-enhanced chemical vapor deposition (MW-PECVD) technique. The decomposition of methane, which is used as a precursor gas, is achieved without the need for remote plasma. Raman spectroscopy, atomic force microscopy and resistance characteristic measurements were performed to investigate the potential of graphene for use in sensing applications. We show that the thickness and quality of graphene film greatly depend on the CH4/H2 flow ratio, as well as on chamber pressure during the synthesis. By varying these parameters, the intensity ratio of Raman D and G bands of graphene varied between ~1 and ~4, while the 2D to G band intensity ratio was found to be 0.05-0.5. Boundary defects are the most prominent defect type in PECVD graphene, giving it a grainy texture. Despite this, the samples exhibited sheet resistance values as low as 1.87 kΩ/□. This reveals great potential for PECVD methods and could contribute toward efficient and straightforward graphene growth on various substrates.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11509920/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142504492","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}

引用次数: 0

Effects of ZrO₂ Nano-Particles' Incorporation into SnAgCu Solder Alloys: An Experimental and Theoretical Study. ZrO2 纳米粒子掺入锡银铜焊料合金的影响：实验与理论研究

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-12 DOI: 10.3390/nano14201636

Agata Skwarek, Halim Choi, Tamás Hurtony, Jaeduk Byun, Ahmad Azmin Mohamad, David Bušek, Karel Dušek, Balázs Illés

{"title":"Effects of ZrO2 Nano-Particles' Incorporation into SnAgCu Solder Alloys: An Experimental and Theoretical Study.","authors":"Agata Skwarek, Halim Choi, Tamás Hurtony, Jaeduk Byun, Ahmad Azmin Mohamad, David Bušek, Karel Dušek, Balázs Illés","doi":"10.3390/nano14201636","DOIUrl":"https://doi.org/10.3390/nano14201636","url":null,"abstract":"This study investigates the mechanism and effects of incorporating different ZrO2 nano-particles into SAC0307 solder alloys. ZrO2 nano-powder and nano-fibers in 0.25-0.5 wt% were added to the SAC0307 alloy to prepare composite solder joints by surface mount technology. The solder joints were shear tested before and after a 4000 h long 85 °C/85% RH corrosive reliability test. The incorporation of ZrO2 nano-particles enhanced the initial shear force of the solder joint, but they decreased the corrosion resistance in the case of 0.5 wt%. SEM, EDS, and FIB analysis revealed intensive growth of SnO2 on the solder joint surfaces, leading to the formation of Sn whiskers. Density functional theory (DFT) simulations showed that, despite Sn being able to bond to the surface of ZrO2, the binding energy was weak, and the whole system was therefore unstable. It was also found that ZrO2 nano-particles refined the microstructure of the solder joints. Decreased β-Sn grain size and more dispersed intermetallic compounds were observed. The microstructural refinement caused mechanical improvement of the ZrO2 composite solder joints by dispersion strengthening but could also decrease their corrosion resistance. While ZrO2 nano-particles improved the solder joint mechanical properties, their use is recommended only in non-corrosive environments, such as microelectronics for space applications.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510246/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142504480","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}

引用次数: 0

Novel Bis(4-aminophenoxy) Benzene-Based Aramid Copolymers with Enhanced Solution Processability. 具有更佳溶液加工性的新型双（4-氨基苯氧基）苯基芳纶共聚物。

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201632

Wonseong Song, Amol M Jadhav, Yeonhae Ryu, Soojin Kim, Jaemin Im, Yujeong Jeong, Vanessa, Youngjin Kim, Yerin Sung, Yuri Kim, Hyun Ho Choi

{"title":"Novel Bis(4-aminophenoxy) Benzene-Based Aramid Copolymers with Enhanced Solution Processability.","authors":"Wonseong Song, Amol M Jadhav, Yeonhae Ryu, Soojin Kim, Jaemin Im, Yujeong Jeong, Vanessa, Youngjin Kim, Yerin Sung, Yuri Kim, Hyun Ho Choi","doi":"10.3390/nano14201632","DOIUrl":"https://doi.org/10.3390/nano14201632","url":null,"abstract":"Aramid copolymers have garnered significant interest due to their potential applications in extreme environments such as the aerospace, defense, and automotive industries. Recent developments in aramid copolymers have moved beyond their traditional use in high-strength, high-temperature resistant fibers. There is now a demand for new polymers that can easily be processed into thin films for applications such as electrical insulation films and membranes, utilizing the inherent properties of aramid copolymers. In this work, we demonstrate two novel aramid copolymers that are capable of polymerizing in polar organic solvents with a high degree of polymerization, achieved by incorporating flexible bis(4-aminophenoxy) benzene moieties into the chain backbone. The synthesized MBAB-aramid and PBAB-aramid have enabled the fabrication of exceptionally thin, clear films, with an average molecular weight exceeding 150 kDa and a thickness ranging from 3 to 10 μm. The dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) reveal that the thin films of MBAB-aramid and PBAB-aramid exhibited glass transition temperatures of 270.1 °C and 292.7 °C, respectively, and thermal decomposition temperatures of 449.6 °C and 465.5 °C, respectively. The mechanical tensile analysis of the 5 μm thick films confirmed that the tensile strengths, with elongation at break, are 107.1 MPa (50.7%) for MBAB-aramid and 113.5 MPa (58.4%) for PBAB-aramid, respectively. The thermal and mechanical properties consistently differ between the two polymers, which is attributed to variations in the linearity of the polymer structures and the resulting differences in the density of intermolecular hydrogen bonding and pi-pi interactions. The resulting high-strength, ultra-thin aramid materials offer numerous potential applications in thin films, membranes, and functional coatings across various industries.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510568/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142504503","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}

引用次数: 0

Application of Nanomaterials in Biomedical Imaging and Cancer Therapy II. 纳米材料在生物医学成像和癌症治疗中的应用 II.

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201627

James C L Chow

引用次数: 0

Correction: Dulski et al. An Organic-Inorganic Hybrid Nanocomposite as a Potential New Biological Agent. Nanomaterials 2020, 10, 2551. 更正：Dulski et al. An Organic-Inorganic Hybrid Nanocomposite as a Potential New Biological Agent.Nanomaterials 2020, 10, 2551.

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201626

Mateusz Dulski, Katarzyna Malarz, Michał Kuczak, Karolina Dudek, Krzysztof Matus, Sławomir Sułowicz, Anna Mrozek-Wilczkiewicz, Anna Nowak

引用次数: 0

Microstructure Evolution of the Interface in SiC_f/TiC-Ti₃SiC₂ Composite under Sequential Xe-He-H Ion Irradiation and Annealing Process. Xe-He-H 离子连续辐照和退火过程中 SiCf/TiC-Ti3SiC2 复合材料界面的微观结构演变

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201629

Penghui Lei, Qing Chang, Mingkun Xiao, Chao Ye, Pan Qi, Fangjie Shi, Yuhua Hang, Qianwu Li, Qing Peng

{"title":"Microstructure Evolution of the Interface in SiCf/TiC-Ti3SiC2 Composite under Sequential Xe-He-H Ion Irradiation and Annealing Process.","authors":"Penghui Lei, Qing Chang, Mingkun Xiao, Chao Ye, Pan Qi, Fangjie Shi, Yuhua Hang, Qianwu Li, Qing Peng","doi":"10.3390/nano14201629","DOIUrl":"https://doi.org/10.3390/nano14201629","url":null,"abstract":"A new type of SiCf/TiC-Ti3SiC2 composite was prepared by the Spark Plasma Sintering (SPS) method in this work. The phase transformation and interface cracking of this composite under ion irradiation (single Xe, Xe + He, and Xe + He + H ions) and subsequent annealing were analyzed using transmission electron microscopy (TEM), mainly focusing on the interface regions. Xe ion irradiation resulted in the formation of high-density stacking faults in the TiC coatings and the complete amorphization of SiC fibers. The implanted H ions exacerbated interface coarsening. After annealing at 900 °C for 2 h, the interface in the Xe + He + H ion-irradiated samples was seriously damaged, resulting in the formation of large bubbles and cracks. This damage occurred because the H atoms reduced the surface free energy, thereby promoting the nucleation and growth of bubbles. Due to the absorption effect of the SiCf/TiC interface on defects, the SiC fiber areas near the interface recovered back to the initial nano-polycrystalline structure after annealing.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510621/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142504499","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}

引用次数: 0

Enhanced Photoelectrochemical Water Splitting of In₂S₃ Photoanodes by Surface Modulation with 2D MoS₂ Nanosheets. 通过二维 MoS2 纳米片的表面调制增强 In2S3 光阳极的光电化学水分离能力

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201628

Roshani Awanthika Jayarathna, Jun-Ho Heo, Eui-Tae Kim

引用次数: 0

Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications. 在滴铸碳纳米管薄膜中形成蜂窝状电池结构，用于高效太阳能吸收器。

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201633

Saiful Islam, Hiroshi Furuta

{"title":"Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications.","authors":"Saiful Islam, Hiroshi Furuta","doi":"10.3390/nano14201633","DOIUrl":"https://doi.org/10.3390/nano14201633","url":null,"abstract":"This study investigates the process of using multi-walled carbon nanotube (MWCNT) coatings to enhance lamp heating temperatures for solar thermal absorption applications. The primary focus is studying the effects of the self-organized honeycomb structures of CNTs formed on silicon substrates on different cell area ratios (CARs). The drop-casting process was used to develop honeycomb-structured MWCNT-coated absorbers with varying CAR values ranging from ~60% to 17%. The optical properties were investigated within the visible (400-800 nm) and near-infrared (934-1651 nm) wavelength ranges. Although fully coated MWCNT absorbers showed the lowest reflectance, honeycomb structures with a ~17% CAR achieved high-temperature absorption. These structures maintained 8.4% reflectance at 550 nm, but their infrared reflection dramatically increased to 80.5% at 1321 nm. The solar thermal performance was assessed throughout a range of irradiance intensities, from 0.04 W/cm2 to 0.39 W/cm2. The honeycomb structure with a ~17% CAR value consistently performed better than the other structures by reaching the highest absorption temperatures (ranging from 52.5 °C to 285.5 °C) across all measured intensities. A direct correlation was observed between the reflection ratio (visible: 550 nm/infrared: 1321 nm) and the temperature absorption efficiency, where lower reflection ratios were associated with higher temperature absorption. This study highlights the significant potential for the large-scale production of cost-effective solar thermal absorbers through the application of optimized honeycomb-structured absorbers coated with MWCNTs. These contributions enhance solar energy efficiency for applications in water heating and purification, thereby promoting sustainable development.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510551/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142504491","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}

引用次数: 0

Highly Efficient Organic/Silicon Hybrid Solar Cells with a MoO₃ Capping Layer. 具有 MoO3 盖层的高效有机/硅混合太阳能电池。

IF 4.4 3区材料科学

Nanomaterials Pub Date : 2024-10-11 DOI: 10.3390/nano14201630

Jiahui Chen, Zhangbo Lu, Xiaoting Wang, Yuner Luo, Yun Ma, Gang Lou, Dan Chi, Shihua Huang

{"title":"Highly Efficient Organic/Silicon Hybrid Solar Cells with a MoO3 Capping Layer.","authors":"Jiahui Chen, Zhangbo Lu, Xiaoting Wang, Yuner Luo, Yun Ma, Gang Lou, Dan Chi, Shihua Huang","doi":"10.3390/nano14201630","DOIUrl":"https://doi.org/10.3390/nano14201630","url":null,"abstract":"Organic/Si hybrid solar cells have attracted considerable attention for their uncomplicated fabrication process and superior device efficiency, making them a promising candidate for sustainable energy applications. However, the efficient collection and separation of charge carriers at the organic/Si heterojunction interface are primarily hindered by the inadequate work function of poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT:PSS). Here, the application of a high-work-function MoO3 film onto the n-Si/PEDOT:PSS surface leads to a notable enhancement in the device's built-in potential. This enhancement results in the creation of an inversion layer near the n-Si surface and facilitates charge separation at the interface. Simultaneously, it inhibits charge recombination at the heterojunction interface. As a result, the champion PEDOT:PSS/Si solar cell, which incorporates a MoO3 interface layer, demonstrates an efficiency of 16.0% and achieves a high fill factor of 80.8%. These findings provide a straightforward and promising strategy for promoting the collection and transmission of charge carriers at the interface of photovoltaic devices.","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11510610/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142516483","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}

引用次数: 0