Predictions of micromechanics models for interfacial/interphase parameters in polymer/metal nanocomposites

Zare, Yasser,Rhee, Kyong Yop,Park, Soo-Jin Elsevier 2017 International journal of adhesion and adhesives Vol.79 No.-

<P><B>Abstract</B></P> <P>In this paper, the polymer-metal interfacial/interphase parameters (PMIP) in polymer/metal nanocomposites are studied by modeling the mechanical properties. In this regard, the experimental results of yield strength, Young's modulus and elongation at break can be compared with the micromechanical models to evaluate the PMIP. The good agreement obtained between the experimental data of samples and the predictions confirms the applicability of models for polymer/metal nanocomposites. Many calculated parameters show the existence of a strong interphase in the reported samples. It is concluded that the fine morphology of nanoparticles and the strong interaction/adhesion at the polymer-metal interface can produce the significant PMIP in the polymer/metal nanocomposites.</P>

Research Trends in Polymer Materials for Use in Lightweight Vehicles

류민영,최태균 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

Weight reduction of vehicle is very important because vehicle weight directly affects energy consumption. Studies researchinglightweight vehicle manufacturing process that use polymers are reviewed in this paper. Approaches reducing the weights of vehiclesusing polymers most frequently involve replacing ferrous and non-ferrous metals with polymers and increasing the specific strengthsand rigidities of polymers. Researches into polymers for use in lightweight vehicle are classified into high performance polymers,polymers for weight reduction, reinforced polymer composites, polymer sandwich panels, and polymer/metal hybrid systems. A diverserange of polymer materials can be used to make vehicle components and the manufacturing methods required to produce and workthose materials vary greatly. Shaping processes must be chosen according to the materials being used and the product design. Replacement of metal products with polymer materials in current vehicles is limited. Large amounts of lightweight materials, suchas polymers, will be greatly used to construct newly developed vehicles, including electric and electric/hybrid vehicles.

Selective Sensing of Methanol by Poly(m-aminophenol)/Copper Nanocomposite

Madhusmita Bhuyan,Siddhartha Samanta,Pradip Kar 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2

The nanocomposite film of conducting poly(m-aminophenol) with copper nanoparticles (PmAP/Cu) prepared by a singlestepprocess has been demonstrated as the sensor material for selective detection of methanol vapor. Different techniques likeFourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, X-ray diffraction spectroscopy, scanning electronmicroscopy (SEM) and transmission electron microscopy (TEM) were used to evaluate the interfacial interactions betweenPmAP and Cu nanoparticles within their conducting nanocomposites. The induced doping interaction through fluctuatingelectrostatic charge transfer between free –OH groups of the PmAP and Cu nanoparticles was confirmed from the spectralcharacterizations. About 3 wt% of Cu nanoparticles having average size of around 30–50 nm confirmed by the SEM and TEManalysis, was optimized inside the PmAP matrix in terms of better dispersion as well as achieving the highest conductivity(1.05 × 10−6 S/cm). The sensing performances, viz., % response, response time, recovery time, selectivity and reproducibilityof the nanocomposites were studied towards methanol vapor at different concentrations. The mechanism of selectivemethanol vapor sensing by PmAP/Cu nanocomposite film has been explained on the basis of selective dipole interactioncharacterized by zeta potential measurement.

Physicochemical characteristics of a nanocomposite film based on purified sodium carboxymethylcellulose and selenium nanoparticles

Yunusov Khaydar Ergashovich,Turakulov Fozil Mamaraim Ugli,Sarymsakov Abdushkur Abdukhalilovich,Yuldoshov Sherzod Abdullaevich,Rashidova Sayyora Sharafovna,Guohua Jiang 대한화학회 2024 Bulletin of the Korean Chemical Society Vol.45 No.3

In this study, selenium nanoparticles (SeNPs) were synthesized and stabilized by reducing sodium selenite using ascorbic acid in an aqueous solution of sodium carboxymethylcellulose (Na‐CMC) with a degree of substitution of 0.97 and a degree of polymerization of 810. IR‐Fourier spectroscopy revealed that coordination bonds between functional groups in Na‐CMC and SeNPs resulted in the development of polymer‐metal complexes. UV–Vis spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and dynamic light scattering (DLS) methods were used to determine the SeNP sizes in the structure of the nanocomposite film. Investigation of the stabilization and nonstabilization of SeNPs over several cycles has shown that the effect of the polymer matrix of Na‐CMC on the stabilization of nanoparticles was achieved for 672 h, which was confirmed by the unchanged size distribution and resistance to change of the SeNPs synthesized in Na‐CMC solutions. In this study, selenium nanoparticles (SeNPs) were synthesized and stabilized by reducing sodium selenite using ascorbic acid in an aqueous solution of sodium carboxymethylcellulose (Na-CMC) with a degree of substitution of 0.97 and a degree of polymerization of 810. IR-Fourier spectroscopy revealed that coordination bonds between functional groups in Na-CMC and SeNPs resulted in the development of polymer-metal complexes. UV–Vis spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and dynamic light scattering (DLS) methods were used to determine the SeNP sizes in the structure of the nanocomposite film. Investigation of the stabilization and nonstabilization of SeNPs over several cycles has shown that the effect of the polymer matrix of Na-CMC on the stabilization of nanoparticles was achieved for 672 h, which was confirmed by the unchanged size distribution and resistance to change of the SeNPs synthesized in Na-CMC solutions.

Advances in self-healing supramolecular soft materials and nanocomposites

Pooi See Lee,Matthew Wei Ming Tan,Gurunathan Thangavel 나노기술연구협의회 2019 Nano Convergence Vol.6 No.29

The ability to rationally tune and add new end-groups in polymers can lead to transformative advances in emerging self-healing materials. Self-healing networks manipulated by supramolecular strategies such as hydrogen bonding and metal coordination have received significant attention in recent years because of their ability to extend materials lifetime, improve safety and ensure sustainability. This review describes the recent advancements in supramolecular polymers self-healing networks based on hydrogen bonding, metal-containing polymers and their nanocomposites. Collectively, the aim of this review is to provide a panoramic overview of the conceptual framework for the interesting nexus between hydrogen bonding and metal–ligand interactions for enabling supramolecular self-healing soft materials networks and nanocomposites. In addition, insights on the current challenges and future perspectives of this field to propel the development of self-healing materials will be provided.

A Green Route for Quick and Kilogram Production of Reduced Graphene Oxide and Their Applications at Low Loadings in Epoxy Resins

( Ajay ),( Chang Kook Hong ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

A green approach to produce bulk amount rGO using Graphene Oxide via Ball Milling in presence of Zinc. Furthermore, the extent of reduction of GO in the present strategy is much higher than that in the different approaches using metallic Zinc and NaOH, indicating a cooperativity between friction generated during milling and chemical reactions. To verify the applicability, we have examined the impact of rGO on the improvement of thermo-mechanical properties of Epoxy nanocomposites. Here, few layered rGO based Epoxy nanocomposites were obtained. Here rGO apparently filled in the interspaces of polymeric chains, which increments in thermo-mechanical properties of nanocomposites even with low loading of rGO.

Super-hydrophobic and antimicrobial properties of Ag-PPFC nanocomposite thin films fabricated using a ternary carbon nanotube-Ag-PTFE composite sputtering target

Cho, Eunmi,Kim, Sung Hyun,Kim, Mac,Park, Jin-Seong,Lee, Sang-Jin Elsevier 2019 Surface & coatings technology Vol.370 No.-

<P><B>Abstract</B></P> <P>Ag-plasma polymer fluorocarbon (PPFC) nanocomposite thin films were fabricated using ternary carbon nanotube-Ag-polytetrafluoroethylene composite target by the mid-range frequency dual sputtering method. Ag nanoparticles of diameter 6–8 nm were found to be uniformly distributed in the PPFC matrix. The Ag-PPFC nanocomposite thin films coated on a polyethylene terephthalate (PET) substrate showed higher visible light transmittance than the bare substrate owing to the low refractive index of the thin film and the optical compensation effect; the coating also exhibited excellent water repellency due to the low surface energy of the PPFC matrix. The Ag nanoparticles had no observable effect on the optical and surface properties of the thin film. The Ag-PPFC nanocomposite thin films on fabric substrates exhibited deposition coverage on both front and back surfaces of the fabric, thereby rendering super-hydrophobic characteristics to the entire substrate. The Ag-PPFC nanocomposite thin films were found to have superior antimicrobial properties, suppressing the growth and proliferation of bacteria by up 92.2% compared with uncoated substrates. This is attributed to the super-hydrophobic property of the PPFC matrix and the antimicrobial characteristics of Ag nanoparticles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag-plasma polymer fluorocarbon(PPFC) nanocomposite thin film fabricated using CNT-Ag-PTFE target by sputtering process </LI> <LI> PPFC matrix and Ag nanoparticles have grown independently without chemical reaction </LI> <LI> Super-hydrophobic surface are realized by coating Ag-PPFC nanocomposite on fiber substrate </LI> <LI> Antimicrobial properties of Ag-PPFC nanocomposite are superior due to the activity of Ag and water repellency of PPFC </LI> </UL> </P>

Nanoparticle-Mediated Combination Therapy: Two-in-One Approach for Cancer

Gurunathan, Sangiliyandi,Kang, Min-Hee,Qasim, Muhammad,Kim, Jin-Hoi MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.10

<P>Cancer represents a group of heterogeneous diseases characterized by uncontrolled growth and spread of abnormal cells, ultimately leading to death. Nanomedicine plays a significant role in the development of nanodrugs, nanodevices, drug delivery systems and nanocarriers. Some of the major issues in the treatment of cancer are multidrug resistance (MDR), narrow therapeutic window and undesired side effects of available anticancer drugs and the limitations of anticancer drugs. Several nanosystems being utilized for detection, diagnosis and treatment such as theranostic carriers, liposomes, carbon nanotubes, quantum dots, polymeric micelles, dendrimers and metallic nanoparticles. However, nonbiodegradable nanoparticles causes high tissue accumulation and leads to toxicity. MDR is considered a major impediment to cancer treatment due to metastatic tumors that develop resistance to chemotherapy. MDR contributes to the failure of chemotherapies in various cancers, including breast, ovarian, lung, gastrointestinal and hematological malignancies. Moreover, the therapeutic efficiency of anticancer drugs or nanoparticles (NPs) used alone is less than that of the combination of NPs and anticancer drugs. Combination therapy has long been adopted as the standard first-line treatment of several malignancies to improve the clinical outcome. Combination therapy with anticancer drugs has been shown to generally induce synergistic drug actions and deter the onset of drug resistance. Therefore, this review is designed to report and analyze the recent progress made to address combination therapy using NPs and anticancer drugs. We first provide a comprehensive overview of the angiogenesis and of the different types of NPs currently used in treatments of cancer; those emphasized in this review are liposomes, polymeric NPs, polymeric micelles (PMs), dendrimers, carbon NPs, nanodiamond (ND), fullerenes, carbon nanotubes (CNTs), graphene oxide (GO), GO nanocomposites and metallic NPs used for combination therapy with various anticancer agents. Nanotechnology has provided the convenient tools for combination therapy. However, for clinical translation, we need continued improvements in the field of nanotechnology.</P>

Active-tunable Structural Color Printing of Silver Nanocomposite via Focused Ion Beam Nanofabrication Method

J. Yu(류종하),Y. Quan(전영준),T. Li(이철림),H. Lee(이현택),S.-H. Ahn(안성훈) 한국정밀공학회 2017 한국정밀공학회 학술발표대회 논문집 Vol.2017 No.12월