Nanoscale Reports最新文献

Optical and thermal studies on binary liquid crystal mixture 二元液晶混合物的光学和热研究

Nanoscale Reports Pub Date : 2021-04-30 DOI: 10.26524/nr.4.7

Sundaram S, Vasanthi T, Jayaprakash T, Balasubramanian V, Vijayakumar V N

{"title":"Optical and thermal studies on binary liquid crystal mixture","authors":"Sundaram S, Vasanthi T, Jayaprakash T, Balasubramanian V, Vijayakumar V N","doi":"10.26524/nr.4.7","DOIUrl":"https://doi.org/10.26524/nr.4.7","url":null,"abstract":"The novel binaryliquid crystal mixture is designed and synthesized from 4-methoxycinnamic acid (MCA) and 4-ethoxycinnamic acid \u0000(ECA). Quantum chemical (DFT) calculation for MCA+ECA geometry is optimized by DFT/B3LYP with 6-311G (d, p) basis set and its \u0000results are good agreement with experimental data. Fourier-transform infrared spectroscopic(FT-IR) study confirm the presence of \u0000intermolecular hydrogen bond in the liquid crystal mixture .The paramorphic changes in nematic phase and thermo-optic properties \u0000of binary liquid crystal mixture isanalyzed using polarizing optical microscope (POM) and differential scanning calorimetry (DSC) \u0000techniques. A noteworthy observation in the present liquid crystal mixture possesses smectic A phase along with nematic phases. \u0000Intermolecular hydrogen bond interaction and it’s stabilization energy of present mixture is studied by natural bond orbital (NBO) \u0000analysis. Due to the transition,the presen tliquid crystal mixtur einduces smecticA phase. The molecular properties of presen t binary liquid crystal mixtureis analyzed by HOMO-LUMO and experimental UV-Visible studies. Thermal spanwidth, stability factor and quantum chemical properties of the liquid crystal mixture are calculated.Molecular electrostatic potential, mulliken atomic \u0000charge distribution of the optimized MCA+ECA geometry is also reported.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74843037","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

Study of a-C:H thin films deposited by Plasma Immersion Ion Implantation for mechanical and tribological applications 等离子体浸没离子注入沉积a-C:H薄膜的机械和摩擦学研究

Nanoscale Reports Pub Date : 2019-07-14 DOI: 10.26524/NR1933

Péricles Lopes SantAna, R. J. Santos, J. Bortoleto, N. Cruz, E. Rangel, L. V. Santos, Silva Tf

{"title":"Study of a-C:H thin films deposited by Plasma Immersion Ion Implantation for mechanical and tribological applications","authors":"Péricles Lopes SantAna, R. J. Santos, J. Bortoleto, N. Cruz, E. Rangel, L. V. Santos, Silva Tf","doi":"10.26524/NR1933","DOIUrl":"https://doi.org/10.26524/NR1933","url":null,"abstract":"The tribological and mechanical properties of DLC films deposited on the surface of 16MnCr5 steel alloy were investigated. The major concerning of using DLC layers on engine parts are: (i) to reduce friction; (ii) to increase fuel efficiency and to reduce CO2 emission; (iii) to increase hardness of alloy steel. After polished and ultrasonicated, 16MnCr5 substrates were submitted to PIIID procedures in radiofrequency plasmas (13.56 MHz) generated from atmospheres of methane and argon. Excitation power and total gas pressure were kept constant. It was investigated the effect of methane proportion on the microstructure and mechanical properties of the films using the follow techniques: Raman Spectroscopy (for Hydrogen content and microstructure analysis), Ultra Micro-Tribometer (for friction coefficient) and Nanoindentation (hardness evaluation). Raman analysis confirmed DLC character of the films produced, and the proportion of 80% methane and 20% argon resulted to the best performance of mechanical properties of the films owing to the increase of hardness in until ten times, and reducing the friction coefficient to about 0.2. In addition, thickness for these films varied from 165 nm to 206 nm.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88310355","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

Evaluation of Antibacterial and In vivo Wound healing activity of Carbon Dot Nanoparticles 碳点纳米颗粒的抗菌和体内伤口愈合活性评价

Nanoscale Reports Pub Date : 2019-07-12 DOI: 10.26524/NR1932

H. Muktha, R. Sharath, Nagaraju Kottam, S. Srinath, Y Randhir

{"title":"Evaluation of Antibacterial and In vivo Wound healing activity of Carbon Dot Nanoparticles","authors":"H. Muktha, R. Sharath, Nagaraju Kottam, S. Srinath, Y Randhir","doi":"10.26524/NR1932","DOIUrl":"https://doi.org/10.26524/NR1932","url":null,"abstract":"Treating post-surgical wound is one of the major challenges in the field of medical Science due to the several disadvantages posed by the antibiotics. The antimicrobial and Wound healing activity of metal based nanoparticles were well known, but the effects of carbon dot nanoparticles (C-Dots) are less explored. In the present study a wet chemical method for the synthesis of C-Dots from sucrose, glucose and fructose was developed and they were characterized by UV-Visible, Fluorescent spectroscopic techniques and the pharmaceutical applications such as antibacterial and the wound healing activities were evaluated. The study revealed that the C-Dots synthesized from Sucrose (SCD) and Glucose (GCD) showed potent antibacterial activity against both positive and negative bacterial strains at 12.5µl/ml (0.1 ± 0.003) and Fructose (FCD) at 50 µl/ml (0.1 ± 0.01) compared to the vehicle Control (0.61 ± 0.06). The wound healing of SCD (367.8 ± 15.2) was observed better than the Control (280.8 ± 10.72) and FCD (326.8 ± 9.41). GCD (166.8 ± 10.83) skin tissues indicated best healing as compared to FCD (135.8 ± 8.29), SCD (157.3 ± 16.97) and Control (135.8 ± 8.29). The results suggest that C-Dots applied topically possess wound healing activity and have potential applications as a bacteriostatic agent.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87311717","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: 5

Nanoparticle synthesis approaches at a glance 纳米粒子合成方法一览

Nanoscale Reports Pub Date : 2019-07-12 DOI: 10.26524/NR1931

Wali Muhammad, Iqra Haleem, N. Ullah, Muhammad Qasim Khan, N. Senthilkumar

引用次数: 1

A Review on Nanotechnology Applications in Electric Components 纳米技术在电子元件中的应用综述

Nanoscale Reports Pub Date : 2019-05-30 DOI: 10.26524/NR1924

Salma Zeb, I. Ullah, A. Karim, Wali Muhammad, N. Ullah, Mehmand Khan, W. Komal

引用次数: 6

Silver Nanoparticle-Mediated Cellular Responses in Human Keratinocyte Cell Line HaCaT in Vitro 纳米银介导的人角质形成细胞系HaCaT的细胞反应

Nanoscale Reports Pub Date : 2019-04-26 DOI: 10.26524/NR1921

K. Habas, L. Shang

{"title":"Silver Nanoparticle-Mediated Cellular Responses in Human Keratinocyte Cell Line HaCaT in Vitro","authors":"K. Habas, L. Shang","doi":"10.26524/NR1921","DOIUrl":"https://doi.org/10.26524/NR1921","url":null,"abstract":"The interactions between cells and nanoparticles has been the focus of recent research in the area. The effects of AgNPs on skin cell lines for further potential biological applications are highlighted. This study aimed to investigate the mechanism of cytotoxic and genotoxic effects of AgNPs nanoparticles on human skin keratinocytes (HaCaT). Genocytotoxic effects of AgNPs was assessed using changes in various cellular parameters of HaCaT cells involving viability, superoxide anion radical production, lactate dehydrogenase release and the levels of the antioxidant enzymes, namely, Catalase, Glutathione peroxidase (GPX) and Superoxide Dismutase (SOD). Superoxide anion was detected using nitroblue tetrazolium NBT reduction assay. LDH levels was evaluated using the standard kit, and activity of antioxidant enzymes such as catalase (CAT), glutathione peroxidase 1 (GPX-1) and superoxide dismutase 1 (SOD-1) were quantified using qPCR. Our results indicated that AgNPs caused severe HaCaT oxidative damage, accompanied by increased the production of superoxide anion levels as well as significant decrease in endogenous antioxidant enzyme of SOD, CAT, GPX expression involved in HaCat cells in vitro. Our study suggests that AgNPs exposure increased oxidative stress levels. Moreover; the low cytotoxic effect observed on human HaCaT keratinocytes suggested that these nano-compounds have a potential toxic effect at the skin level only after long-term exposure.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78254715","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: 5

Structural and Electrical Properties of ZnO Varistor with Different Particle Size for Initial Oxides Materials 初始氧化物材料中不同粒径氧化锌压敏电阻的结构和电性能

Nanoscale Reports Pub Date : 2019-04-26 DOI: 10.26524/NR1923

S. A. Amin

{"title":"Structural and Electrical Properties of ZnO Varistor with Different Particle Size for Initial Oxides Materials","authors":"S. A. Amin","doi":"10.26524/NR1923","DOIUrl":"https://doi.org/10.26524/NR1923","url":null,"abstract":"We report here structural, electrical and dielectric properties of ZnO varistors prepared with two different particle sizes for initial starting oxides materials (5 µm and 200 nm). It is found that the particle size of ZnO does not influence the hexagonal wurtzite structure of ZnO, while the lattice parameters, crystalline diameter, grain size and Zn-O bond length are affected. The nonlinear coefficient, breakdown field and barrier height are decreased from 18.6, 1580 V/cm and 1.153 eV for ZnO micro to 410 V/cm, 7.26 and 0.692 eV for ZnO nano. While, residual voltage and electrical conductivity of upturn region are increased from 2.08 and 2.38x10-5 (Ω.cm)-1 to 4.55 and 3.03x10-5 (Ω.cm)-1. The electrical conductivity increases by increasing temperature for both varistors, and it is higher for ZnO nano than that of ZnO micro. The character of electrical conductivity against temperature is divided into three different regions over the temperature intervals as follows; (300 K ≤ T ≤ 420 K), (420 K ≤ T ≤ 580 K) and (580 K ≤ T ≤ 620 K), respectively. The activation energy is increased in the first region from 0.141 eV for ZnO micro to 0.183 eV for ZnO nano and it is kept nearly constant in the other two regions. On the other hand, the average conductivity deduced through dielectric measurements is increased from 2.54x10-7 (Ω.cm)-1 for ZnO micro to 49x10-7 (Ω.cm)-1. Similar behavior is obtained for the conductivities of grains and grain boundaries. The dielectric constant decreases as the frequency increases for both varistors, and it is higher for ZnO nano than that of ZnO micro. These results are discussed in terms of free excited energy and strength of link between grains of these varistors.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82533258","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: 5

Recent Nanotechnological Approaches on Capturing, Isolating, and Identifying Circulating Tumor Cells 捕获、分离和鉴定循环肿瘤细胞的最新纳米技术方法

Nanoscale Reports Pub Date : 2019-04-26 DOI: 10.26524/NR1922

A. B. Sözmen, Ahu Arslan Yildiz

引用次数: 0

Multitasking Herbal Nanomedicine 多任务草药纳米药物

Nanoscale Reports Pub Date : 2019-02-28 DOI: 10.26524/NR1914

Hendry Izaac El

引用次数: 4

Structural, Optical & Magnetic Properties of (Fe, Al) Co-Doped Zinc Oxide Nanoparticles (Fe, Al)共掺杂氧化锌纳米颗粒的结构、光学和磁性能

Nanoscale Reports Pub Date : 2019-02-28 DOI: 10.26524/NR1912

P. Swapna, S. V. Reddy

{"title":"Structural, Optical & Magnetic Properties of (Fe, Al) Co-Doped Zinc Oxide Nanoparticles","authors":"P. Swapna, S. V. Reddy","doi":"10.26524/NR1912","DOIUrl":"https://doi.org/10.26524/NR1912","url":null,"abstract":"Pure and (Fe, Al) co-doped ZnO nanopowders are prepared via co-precipitation method constructively with PEG as capping agent at room temperature (RT). We kept the aluminum concentration as constant at 5 mol% by altering the iron concentration from one to three mol%. After the finishing point of synthesis, the powders are cautiously subjected to various characterizations for instance XRD, Raman, SEM through EDS, TEM, PL, UV-Vis-NIR and VSM, to analyze the properties of structural, morphological, optical and magnetic. XRD analysis reveals, all the nanopowder samples acquire hexagonal wurtzite structure by the nonexistence of secondary peaks involving to aluminum or iron. This reveals the well dissolving of aluminum and iron in to Zinc Oxide host lattice. The literal size of nanocrystallites is evaluated through TEM pictures, which are approximately corroborated by the XRD calculations. The nanostructures morphology is found through SEM illustrations, and the spectrum of EDS shows that no impurities are existence other than iron and aluminum. Optical properties are deliberated by the PL spectrum and UV-Vis-NIR spectrum; all the powder samples encompass defect associated peaks over the visible range. Magnetic properties are evaluated using VSM and all the co-doped samples contain the Ferromagnetic nature except pristine Zinc Oxide.","PeriodicalId":18967,"journal":{"name":"Nanoscale Reports","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78547040","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: 5