Journal of nanoscience and nanotechnology最新文献_第6页

Ru/TiO₂ Nanostructured Catalysts: Synthesis, Characterization and Catalytic Activity Towards Hydrogenation of Ethyl Levulinate. Ru/TiO 2纳米结构催化剂的合成、表征及其对乙酰丙酸乙酯加氢的催化活性

Journal of nanoscience and nanotechnology Pub Date : 2021-12-01 DOI: 10.1166/jnn.2021.19537

Sakthivel Kumaravel, Sivakumar Thiripuranthagan, Elangovan Erusappan, Aishwarya Sivakumar, Saranraj Kumaravel, Balasubramanian Natesan, Karthi Rajendran

{"title":"Ru/TiO₂ Nanostructured Catalysts: Synthesis, Characterization and Catalytic Activity Towards Hydrogenation of Ethyl Levulinate.","authors":"Sakthivel Kumaravel, Sivakumar Thiripuranthagan, Elangovan Erusappan, Aishwarya Sivakumar, Saranraj Kumaravel, Balasubramanian Natesan, Karthi Rajendran","doi":"10.1166/jnn.2021.19537","DOIUrl":"https://doi.org/10.1166/jnn.2021.19537","url":null,"abstract":"Pristine TiO₂ and x% Ru/TiO₂ catalysts with different wt.% of Ru (x%= 1.5%, 2%, 2.5% and 3%) were synthesized using sol-gel and simple impregnation methods. Different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), High-resolution transmission electron microscope (HR-TEM), Inductively coupled plasma-optical emission spectrometry (ICP-OES) and Thermogravimetry/Differential thermal analysis (TG/DTA) were used to study the physicochemical and morphological properties. The XRD patterns of the as-prepared pristine TiO₂ catalyst showed high crystalline nature. The HR-TEM images revealed that the Ru nanoparticles (NPs) were evenly dispersed on the TiO₂ surface. The prepared catalysts were evaluated for their catalytic activity towards the liquid phase hydrogenation of ethyl levulinate under mild reaction conditions (ambient H2 pressure). Among the various catalysts, 2.5% Ru/TiO₂ catalyst showed the maximum catalytic activity of 79% ethyl levulinate (EL) conversion with 82% selectivity of γ-valerolactone (GVL). The recyclability test revealed that the most active 2.5% Ru/TiO₂ also showed the highest stability of the catalyst under optimized experimental conditions.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 12","pages":"6160-6167"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39159035","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}

引用次数: 4

Superhydrophobic Copper Materials with Excellent Durability and Regeneration Based on Self-Similarity in Structure and Composition. 基于结构和成分自相似的超疏水铜材料具有优异的耐久性和再生性能。

Journal of nanoscience and nanotechnology Pub Date : 2021-12-01 DOI: 10.1166/jnn.2021.19528

Wenxia Bai, Jinxuan Zhou, Xueting Shi, Haitao Wang, Yanhua Liu, Libang Feng

{"title":"Superhydrophobic Copper Materials with Excellent Durability and Regeneration Based on Self-Similarity in Structure and Composition.","authors":"Wenxia Bai, Jinxuan Zhou, Xueting Shi, Haitao Wang, Yanhua Liu, Libang Feng","doi":"10.1166/jnn.2021.19528","DOIUrl":"https://doi.org/10.1166/jnn.2021.19528","url":null,"abstract":"The widespread application of artificial superhydrophobic material is hindered by the poor durability and regeneration of artificial superhydrophobicity. The problem is expected to be resolved by endowing the superhydrophobic material with self-similarity. Herein, Copper-based superhydrophobic material intensified by furfuryl alcohol resin (Cu/FAR) with long-term durability and high strength is developed, and the obtained Cu/FAR composite reveals excellent and durable superhydrophobicity. Moreover, it is a remarkable fact that the as-prepared superhydrophobic Cu/FAR exhibits outstanding durability and maintenance of superhydrophobicity grounded on the good self-similarity in micro-structure, chemical structure and composition both externally and internally. Consequently, the superhydrophobicity can be maintained or regenerated without difficulty even if superhydrophobic surface has been damaged or fouled accidentally. Therefore, the method provides a new thought to prepare superhydrophobic material with robust durability and outstanding maintenance.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 12","pages":"6088-6093"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39159103","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}

引用次数: 0

Polyamide/Chitosan/Tetraethyl Orthosilicate Electrospun Nanofibers for a Novel and Promising Drug Carrier. 聚酰胺/壳聚糖/正硅酸四乙酯静电纺纳米纤维作为新型药物载体。

Journal of nanoscience and nanotechnology Pub Date : 2021-12-01 DOI: 10.1166/jnn.2021.19511

Zhi-Yuan Feng, Chen-Di Wang, Soo-Jin Park, Wan Meng, Long-Yue Meng

{"title":"Polyamide/Chitosan/Tetraethyl Orthosilicate Electrospun Nanofibers for a Novel and Promising Drug Carrier.","authors":"Zhi-Yuan Feng, Chen-Di Wang, Soo-Jin Park, Wan Meng, Long-Yue Meng","doi":"10.1166/jnn.2021.19511","DOIUrl":"https://doi.org/10.1166/jnn.2021.19511","url":null,"abstract":"Chitosan (CS), the only alkaline polysaccharose available in nature, has always been a promising candidate for drug delivery owing to its excellent biodegradability and biocompatibility. However, inherent solubility and polycationic properties of CS largely hinder electrospinning, which is an efficient method of fabricating nanofibers for drug carriers. To solve this problem and extend the applications of CS, polyamide/chitosan/tetraethyl orthosilicate (PA/CS/TEOS) composite nanofibers were successfully prepared as drug carriers in this study via electrospinning. The PA/CS/TEOS ratios significantly influenced the nanofiber morphology. As the content of each was increased, the beads among the membranes increased initially and then decreased, determined by scanning electron microscopy (SEM). The morphology of the optimum membranes with the ratio of 1:0.13:0.67 was smoother with less beads and uniform fiber diameter. Finally, the membranes with optimum ratios were used as carriers of ofloxacin in the study of drug release performance to identify their future feasibility, which revealed an initial fast release followed by a relatively stable release.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 12","pages":"5912-5919"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39158693","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}

引用次数: 1

Fabrication of Self-Healable, Robust Superhydrophobic Surfaces Using UV-Crosslinked Nanocomposite Films. 利用uv交联纳米复合膜制备自愈、坚固的超疏水表面。

Journal of nanoscience and nanotechnology Pub Date : 2021-12-01 DOI: 10.1166/jnn.2021.19086

Yeon-Ah Park, Young-Geun Ha

引用次数: 1

Direct Writing on Paper Substrate to Prepare Silver Electrode Structures for Flexible Sensors. 在纸基板上直接书写制备柔性传感器用银电极结构。

Journal of nanoscience and nanotechnology Pub Date : 2021-12-01 DOI: 10.1166/jnn.2021.19523

Qi Wang, Mingwei Li, Yao Xie, Yun Ou, Weiping Zhou

{"title":"Direct Writing on Paper Substrate to Prepare Silver Electrode Structures for Flexible Sensors.","authors":"Qi Wang, Mingwei Li, Yao Xie, Yun Ou, Weiping Zhou","doi":"10.1166/jnn.2021.19523","DOIUrl":"https://doi.org/10.1166/jnn.2021.19523","url":null,"abstract":"With the rapid development of the electronics industry, electronic products based on silicon and glass substrates electronic products will gradually be unable to meet the rising demand. Flexibility, environmental protection, and low costs are important for the development of electronic products. In this study, an efficient and low-cost method for preparing silver electrode structures by direct writing on paper has been demonstrated. Based on this method, a flexible paper-based sensor was prepared. The liquid printing ink used mainly comprises a precursor liquid without pre-prepared nanomaterials. The precursor liquid is transparent with good fluidity. Simple direct writing technology was used to write on the paper substrate using the precursor ink. When the direct-writing paper substrate was subsequently heated, silver nanostructures precipitated from the precursor liquid ink onto the paper substrate. The effect of different temperatures on the formation of the silver nanostructures and the influence of different direct writing processes on the structures were studied. Finally, a paper-based flexible sensor was prepared for finger-bending signal detection. The method is simple to operate and low in cost and can be used for the preparation of environment-friendly paper-based devices.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 12","pages":"6048-6053"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39159098","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}

引用次数: 0

Luminescence Properties of InGaN/GaN Green Light-Emitting Diodes with Si-Doped Graded Short-Period Superlattice. 掺硅梯度短周期超晶格InGaN/GaN绿色发光二极管的发光特性

Journal of nanoscience and nanotechnology Pub Date : 2021-11-01 DOI: 10.1166/jnn.2021.19460

Ll-Wook Cho, Bom Lee, Kwanjae Lee, Jin Soo Kim, Mee-Yi Ryu

引用次数: 0

Controllable Synthesis of Modified Porous Anatase TiO₂ with High Photocatalytic Activity. 高光催化活性改性多孔锐钛矿tio2的可控合成。

Journal of nanoscience and nanotechnology Pub Date : 2021-11-01 DOI: 10.1166/jnn.2021.19492

Mei-Qing Fan, Heng-Yi Yuan, Cheng Qiu, Hong-Xia Zhao, Xu Zeng, Xiao-Fei Zhang, Bo Ren

{"title":"Controllable Synthesis of Modified Porous Anatase TiO₂ with High Photocatalytic Activity.","authors":"Mei-Qing Fan, Heng-Yi Yuan, Cheng Qiu, Hong-Xia Zhao, Xu Zeng, Xiao-Fei Zhang, Bo Ren","doi":"10.1166/jnn.2021.19492","DOIUrl":"https://doi.org/10.1166/jnn.2021.19492","url":null,"abstract":"In this study, we added ZrO₂ and Y₂O₃ to stabilize the anatase TiO₂ phase at higher temperatures. Composite mesoporous TiO₂/ZrO₂/Y₂O₃ (TZY) oxides were prepared by a sol-gel method, and triblockcopolymer P123 and PEG was used as templates. The properties of the synthesized materials were characterized using X-Ray diffraction (XRD), Raman scattering, N₂ adsorption/desorption, and UV-Visible spectrophotometry (UV-Vis) methods et al. The samples prepared using P123 and PEG as double-template exhibited smaller particles and a higher specific surface area than the samples prepared using P123 and PEG as single-template. Furthermore, crystal phase transition from anatase to rutile occurred later in the case of the double-template method. After introducing ZrO ₂and Y₂O₃, the crystal phase transition and the growth of crystallites were severely suppressed. The results indicated that the RhB degradation efficiency for the double-template method was 99.24%, while the RhB degradation efficiency with TZY/P123 and TZY/PEG samples was 97.43 and 98.18%, respectively.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 11","pages":"5742-5748"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38973733","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}

引用次数: 0

Hormones Nanofiltration in Carbon Nanotubes and Boron Nitride Nanotubes Using Uniform External Electric Field Through Molecular Dynamics. 碳纳米管和氮化硼纳米管中均匀外加电场对激素的分子动力学研究。

Journal of nanoscience and nanotechnology Pub Date : 2021-11-01 DOI: 10.1166/jnn.2021.19467

Rosely Maria Dos Santos Cavaleiro, Tiago da Silva Arouche, Phelipe Seiichi Martins Tanoue, Tais Souza Sá Pereira, Raul Nunes de Carvalho Junior, Fabio Luiz Paranhos Costa, Tarciso Silva de Andrade Filho, Rosivaldo Dos Santos Borges, Antonio Maia de Jesus Chaves Neto

{"title":"Hormones Nanofiltration in Carbon Nanotubes and Boron Nitride Nanotubes Using Uniform External Electric Field Through Molecular Dynamics.","authors":"Rosely Maria Dos Santos Cavaleiro, Tiago da Silva Arouche, Phelipe Seiichi Martins Tanoue, Tais Souza Sá Pereira, Raul Nunes de Carvalho Junior, Fabio Luiz Paranhos Costa, Tarciso Silva de Andrade Filho, Rosivaldo Dos Santos Borges, Antonio Maia de Jesus Chaves Neto","doi":"10.1166/jnn.2021.19467","DOIUrl":"https://doi.org/10.1166/jnn.2021.19467","url":null,"abstract":"Hormones are a dangerous group of molecules that can cause harm to humans. This study based on classical molecular dynamics proposes the nanofiltration of wastewater contaminated by hormones from a computer simulation study, in which the water and the hormone were filtered in two single-walled nanotube compositions. The calculations were carried out by changing the intensities of the electric field that acted as a force exerting pressure on the filtration along the nanotube, in the simulation time of 100 ps. The hormones studied were estrone, estradiol, estriol, progesterone, ethinylestradiol, diethylbestrol, and levonorgestrel in carbon nanotubes (CNTs) and boron nitride (BNNTs). The most efficient nanofiltrations were for fields with low intensities in the order of 10-8 au and 10-7 au. The studied nanotubes can be used in membranes for nanofiltration in water treatment plants due to the evanescent field potential caused by the action of the electric field inside. Our data showed that the action of EF in conjunction with the van der Walls forces of the nanotubes is sufficient to generate the attractive potential. Evaluating the transport of water molecules in CNTs and BNNTs, under the influence of the electric field, a sequence of simulations with the same boundary conditions was carried out, seeking to know the percentage of water molecules filtered in the nanotubes.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 11","pages":"5499-5509"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38975552","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}

引用次数: 0

Effects of Silver Nanoparticles and Silver Nitrate on mRNA and microRNA Expression in Human Hepatocellular Carcinoma Cells (HepG2). 纳米银和硝酸银对人肝癌细胞（HepG2）信使核糖核酸和微小核糖核酸表达的影响。

Journal of nanoscience and nanotechnology Pub Date : 2021-11-01 DOI: 10.1166/jnn.2021.19481

Sheau-Fung Thai, Carlton P Jones, Brian L Robinette, Hongzu Ren, Beena Vallanat, Anna A Fisher, Kirk T Kitchin

{"title":"Effects of Silver Nanoparticles and Silver Nitrate on mRNA and microRNA Expression in Human Hepatocellular Carcinoma Cells (HepG2).","authors":"Sheau-Fung Thai, Carlton P Jones, Brian L Robinette, Hongzu Ren, Beena Vallanat, Anna A Fisher, Kirk T Kitchin","doi":"10.1166/jnn.2021.19481","DOIUrl":"10.1166/jnn.2021.19481","url":null,"abstract":"In order to understand toxicity of nano silver, human hepatocellular carcinoma (HepG2) cells were treated either with silver nitrate (AgNO₃) or with nano silver capped with glutathione (Ag-S) at various concentration. Differentially expressed genelists for mRNA and microRNA were obtained through Illumina RNA sequencing and DEseq data analyses. Both treatments showed non-linear dose response relationships for mRNA and microRNA. Gene expression analysis showed signaling pathways common to both nano Ag-S and AgNO₃, such as cell cycle regulation, DNA damage response and cancer related pathways. But, nano Ag-S caused signaling pathway changes that were not altered by AgNO₃ such as NRF2-mediated oxidative stress response inflammation, cell membrane signaling, and cell proliferation. Nano Ag-S also affected p53 signaling, survival, apoptosis, tissue repair, lipid synthesis, angiogenesis, liver fibrosis and tumor development. Several of the pathways affected by nano Ag-S are hypothesized as major contributors to nanotoxicity. MicroRNA target filter analysis revealed additional affected pathways that were not reflected in the mRNA expression response alone, including DNA damage signaling, genomic stability, ROS, cell cycle, ubiquitination, DNA methylation, cell proliferation and fibrosis for AgNO₃; and cell cycle regulation, P53 signaling, cell proliferation, survival, apoptosis, tissue repair and so on for nano Ag-S. These pathways may be mediated by microRNA repression of protein translation.Our study clearly showed that the addition of microRNA profiling increased the numbers of signaling pathways discovered that affected by the treatments on HepG2 cells and gave US a better picture of the effects of these reagents in the cells.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 11","pages":"5414-5428"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10563035/pdf/nihms-1932007.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38985943","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}

引用次数: 4

Synthesis of Nanocomposites of V₂OO₅©Selenium Nanoparticles and Multiwalled Carbon Nanotubes for Antimicrobial Activity. V₂OO5©纳米硒纳米复合材料与多壁碳纳米管抗菌活性的合成

Journal of nanoscience and nanotechnology Pub Date : 2021-11-01 DOI: 10.1166/jnn.2021.19482

Muthukrishnan Francklin Philips, Jothirathinam Thangarathinam, Jayakumar Princy, Cyril Arockiaraj Crispin Tina, Cyril Arockiaraj Crispin Tina, Annadurai Kasthuri

{"title":"Synthesis of Nanocomposites of V₂OO5©Selenium Nanoparticles and Multiwalled Carbon Nanotubes for Antimicrobial Activity.","authors":"Muthukrishnan Francklin Philips, Jothirathinam Thangarathinam, Jayakumar Princy, Cyril Arockiaraj Crispin Tina, Cyril Arockiaraj Crispin Tina, Annadurai Kasthuri","doi":"10.1166/jnn.2021.19482","DOIUrl":"https://doi.org/10.1166/jnn.2021.19482","url":null,"abstract":"The authors report the preparation of the nanocomposite comprising of vanadium pentoxide (V₂O5) and selenium (Se) nanoparticles and functionalized multiwalled carbon nanotubes (MWCNTs) (V₂O5@Se NPs/MWCNTs). Since Se NPs possesses extraordinary physicochemical properties including larger surface area with higher adsorption capacity, V₂O5 NPs were adsorbed onto Se NPs surface through physisorption process (designated as V₂O5@Se NPs). The nanocomposite synthesized hydrothermally was evaluated for its antimicrobial activity. The morphology and microstructure of the nanocomposite were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis, respectively. Fourier transform infrared spectroscopy (FTIR) and UV-Visible spectroscopy (UV-Vis) were employed to analyze the spectral properties of nanocomposite. The microbicidal efficacy of nanocomposite was tested against Gram-negative (G-)ZGram-positive (G+) bacteria and fungus. This is the first report on the synthesis of V₂O5@Se NPs/MWCNTs nanocomposites by chemical method that showed microbicidal effect on micro-organisms. The thiol (-SH) units facilitates the enrichment of V₂O5@Se NPs onto MWCNTs surface. Ultimately, it reflects on the significant antimicrobial activity of V₂O5@Se NPs/MWCNTs.","PeriodicalId":16417,"journal":{"name":"Journal of nanoscience and nanotechnology","volume":"21 11","pages":"5673-5680"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38905200","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}

引用次数: 1