Advanced Materials Research最新文献

{"title":"Thermophysical Behavior of Polycarbonate: Effect of Free Quenching above and below the Glass Transition Temperature","authors":"Brahim Barka, F. Rouabah, Fairouz Zouaoui, M. Fois, Y. Nouar, A. Bencid","doi":"10.4028/p-a258c5","DOIUrl":"https://doi.org/10.4028/p-a258c5","url":null,"abstract":"Polycarbonate is a tough, amorphous and transparent high performance thermoplastic polymer. It is used in many fields of application due to its versatile thermophysical, mechanical and optical properties. However, one of its drawbacks is its relatively high thermal conductivity which prevents its application as an insulating material. An appropriate heat treatment can therefore be a useful route to improve the thermal insulating property. The objective of this work is to study the effect of heat treatment; namely the influence of the quenching temperature above and below the glass transition temperature (Tg) on the thermophysical properties of neat polycarbonate (PC). The effect of the quenching temperature above Tg was also studied for neat poly (methyl methacrylate) (PMMA). The effect of residual stresses (RS) generated by the free quenching process on the thermophysical properties of neat PC was investigated. The thermal conductivity (k) and thermal diffusivity (a) of neat PC were measured using a periodic measurement method (DICO), (DIffusivity and COnductivity), at room temperature. The DICO method developed in the CERTES laboratory (Center for Studies and Research in Thermal, Environment and Systems of Paris 12 University), allows simultaneous access to the conductivity and thermal diffusivity from which the specific heat (Cp) can then be deduced. This work showed that the quenching from a high temperature above Tg did not affect the thermal conductivity and thermal diffusivity of both PC and PMMA. However, quenching from a temperature below Tg (130 ° C) caused a decrease of both the thermal. In fact the thermal conductivity of PC annealed at 130 ° C which is 0.22 W. m-1 .K-1 decreased to 0.06 W. m-1 .K-1 and 0.14 W. m-1 .K-1 after quenching at 0° C and 40 ° C respectively. This means that quenching would therefore improve the insulating capacity of PC compared to the material which has undergone only annealing. Contrary to the thermal conductivity, the values of the specific heat capacity in this temperature range ( 0° C – 40° C) significantly increased as a result of quenching. They increase from 1118 J. kg-1. K-1 for the annealed sample to 1290 J. kg-1. K-1 for PC quenched at 0° C and increased to 2221 J. kg-1. K-1 for PC quenched at 40 ° C which corresponds to an increase by 98 %. It was also found that the values of thermal conductivity and specific heat were in good agreement with those reported in the literature for neat PC samples quenched below Tg.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"18 1","pages":"123 - 136"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74020103","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":"The Effect of Superplasticizer Dry Extract on Rheological and Mechanical Properties of Self-Compacting Concrete","authors":"Mouhcine Ben Aicha, O. Jalbaud, X. Roguiez, A. Alaoui, Y. Burtschell","doi":"10.4028/p-oj7dxq","DOIUrl":"https://doi.org/10.4028/p-oj7dxq","url":null,"abstract":"The self-compacting concrete (SCC) workability is usually ensured by the addition of superplasticizers in the mixture. The effect of some properties of superplasticizers was investigated by many researchers. However, in the literature, there is no study related to the effect of dry extract of superplasticizer admixture on the rheological and mechanical properties of self-compacting concrete.The objective of this work is to characterize the effects of six types of superplasticizers with various solids on the rheological properties as well as the compressive strength and elastic modulus of SCC.This experimental study shows that the dry extract of superplasticizer affects the various properties of concrete both in the fresh and hardened state: first, the dry extract allows controlling the flow properties (the lower its value, the more the concrete is self-compacting), and second, the dry extract allows the reduction of the water to cement ratio (the greater its value, the stronger the concrete). The statistical coefficients, analyzed in this work, indicate a high-level relationship between the dry extract and the rheological and mechanical behavior of SCC.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"33 1","pages":"65 - 80"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78855689","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":"Residual Strength and Thermal Conductivity of Self-Compacting Concrete with Recycled Expanded Polystyrene Subjected to High Temperatures","authors":"María Eugenia Maciá-Torregrosa, Á. Castillo, Rocío Sancho","doi":"10.4028/p-6klsa7","DOIUrl":"https://doi.org/10.4028/p-6klsa7","url":null,"abstract":"One of the most important processes of physical deterioration in concrete is the exposure to high temperatures that influences their durability and stability during life service. In addition, if self-compacting concrete is formed by lightweight aggregates, such as EPS, it is necessary to analyze its behaviour after it has been exposed to high temperature conditions. This research shows research that evaluates the effect EPS on the mechanical properties of self-compacting concrete at high temperatures. This study evaluated physical-mechanical properties, including residual compressive strength and thermal conductivity after exposure at 22oC, 150oC, 350oC, 500oC and ISO834. Experimental results showed that the loss of residual compressive strength of the specimens up to 350oC is almost insignificance, but it will be reduced by 49% and 70% when temperatures increase up to 500oC and 700oC respectively. EPS contributes to lightness, thermal insulation, and commitment to the environment in lightweight SCC.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"1 1","pages":"15 - 23"},"PeriodicalIF":0.0,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83757679","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":"Synthesis, Structural and Optical Properties of Co Doped α-Sb2O4 Nanocomposites","authors":"G. Bagihalli, Shrishila N. Unki, V. Adimule","doi":"10.4028/p-6jw1f6","DOIUrl":"https://doi.org/10.4028/p-6jw1f6","url":null,"abstract":"Present study reports the Synthesis, optical study of cobalt doped antimony based nanocomposites, which have been prepared by using CoCl3 (0.1M) and SbCl3 (0.1M) in 1:2 ration. The as-synthesized nanocomposites (NS) were analyzed by SEM (scanning electron microscopy), XRD (X-ray diffraction spectroscopy) and UV-Visible spectroscopy The prepared Co:α-Sb2O4 NS are well crystalline with average particle size of 35 to 56 nm. From XRD data X-ray diffraction patterns confirms the orthorhombic phase. From scanning electron microscopy study it shows irregular shape of nanoparticles and crystallinity increases from 36 nm to 56 nm. From optical property studies the blue shift in UV-Visible spectrum of Co:α-Sb2O4 NS is due to overloading of Co ions which intern creates lattice defects. The direct optical band gap (Eg) for Co:α-Sb2O4 NS (10 %) was found to be 3.28 eV.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"17 1","pages":"3 - 11"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73573041","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":"Synthesis, Structural and Optical Properties of Co Doped Sm2O3 Nanostructures","authors":"Santosh S Nandi, V. Adimule, B. Yallur","doi":"10.4028/p-h1j61s","DOIUrl":"https://doi.org/10.4028/p-h1j61s","url":null,"abstract":"In the present investigation Co doped Sm2O3 nanostructures (NS) with different concentrations (1%, 3% and 8%) synthesized by thermal decomposition and surface reduction methods using sodium hydroxide as precipitating agent. Flake-like shaped semiconductor crystal features, morphology, optical absorptivity, chemical composition determined by XRD (X-ray diffraction), SEM (scanning electron microscopy) and UV-Visible. Flake-like morphology of the NS observed in SEM analysis having grain size varies in between 80 and 96 nm. XRD pattern depicted mixed phase of cubic crystal structure with crystallite size lying between 36.8 and 29.9 nm. Red shift in the optical absorptivity was observed in the spectrum, and spectral shift from ultraviolet to visible region with optical band gap (Eg) value decreases from 4.33 to 2.01 eV. Upon excitation with ultraviolet radiation (excitation = 300 nm), NS showed red emission in all concentrations of Co dopant and maximal emission intensity appeared at 485.5 nm for 8% of Co dopant concentration. The NS finds prominent utility in the field of optoelectronics and photoelectronic applications.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"16 1","pages":"59 - 69"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85033225","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":"Modulation of Optical Band Gap of 2-Amino Terephthalic Acid Cu-MOFs Doped with Ag2O and rGO","authors":"Maalathi Challa, M. Ambika, S. Usharani, S. Batakurki, B. Yallur","doi":"10.4028/p-i3rcg6","DOIUrl":"https://doi.org/10.4028/p-i3rcg6","url":null,"abstract":"The synthesized MOF with copper metal dopant has shown band gap around 1.5 eV which falls in the UV region of electromagnetic spectrum. This MOF with copper turns into nano/MOF composite with addition of Ag2O and rGO to it. The results of band gap of MOF/ Ag2O and MOF/rGO showed 1.904 eV and 1.639 eV respectively. This shift in band gap supports to use them as a UV and near visible light harvest catalyst and also assist in enhancing mechanical, thermal and structural behaviour of compounds. The enhancement of band gap of MOF/nanoMO is attributed to the quantum size effect.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"15 1","pages":"35 - 45"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77182191","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":"Synthesis, Morphology and Enhanced Optical Properties of Novel GdxCo3O4 Nanostructures","authors":"V. Adimule, B. Yallur, S. Batakurki, Santosh S Nandi","doi":"10.4028/p-3pkhf6","DOIUrl":"https://doi.org/10.4028/p-3pkhf6","url":null,"abstract":"Abstract: In the present studies, gadolinium doped cobalt oxide nanostructures (1 wt. %, 5 wt. % and 10 wt. %) were synthesized by co-precipitation method. The samples were characterized by SEM (scanning electron microscopy), XRD (X-ray diffraction spectroscopy), UV-Visible spectroscopy. UV-Visible exhibited maximum absorption at 440.81 nm for Gd(10% wt)Co3O4 Band gap energy was calculated using Tauc plots and it was observed that band gap energy decreased from 7.74 eV to 2.64 eV upon increasing the doping percentage of Gd to Co3O4. The crystallinity of the Gd(10% wt) Co3O4 NS increased as compared with Gd(1% wt)Co3O4 NS. SEM morphology revealed average particle size were between 95 nm to 78 nm uniformly distributed over Co3O4 NS.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"48 1","pages":"71 - 82"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90806413","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":"Effect of Alloying Elements on Strengthening Phase and Solidification Structure of Ti-Al-Mo-Zr Titanium Alloy","authors":"J. Tang, Cui Liang, Chenkun Xu, J. Li","doi":"10.4028/p-n3d3bl","DOIUrl":"https://doi.org/10.4028/p-n3d3bl","url":null,"abstract":"This paper mainly studies the composition of strengthening phase, characteristic precipitation temperature and composition range of strengthening phase in Ti-Al-Mo-Zr-Si medical titanium alloy, and the influence of element changes on the content and microstructure of strengthening phase. Promote the formulation of thermodynamic process of titanium alloy powder metallurgy, as well as the formulation of alloy hot working and solid solution aging process. In this paper, Panda thermodynamic software is used to calculate the multicomponent alloy thermodynamics and multicomponent phase diagram of titanium alloy materials. The effects of Al, Mo, Zr, Si and other elements on the precipitation of strengthening phase and the phase transformation content of solidification structure were obtained. It is found that the content of Mo is more than 2 wt.% β phase transition precipitation angle. Meanwhile, in order to avoid the excess of precipitates such as Mo5Si3 and M3Si, the content of Mo should be less than 4.6 wt.%. The content of Zr can be maintained at about 1.5 wt.%. If the aging precipitation of the material is considered, it can be controlled to be less than 2 wt.%. The content of this paper is the basis and improvement of titanium powder metallurgy technology and rapid prototyping technology.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"10 1","pages":"107 - 112"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88954568","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":"Radish (Raphanus sativus) Leaves Mediated CuO-NiO Nanocomposite for Photocatalytic Activity","authors":"V. Pavitra, H. Divya, B. Praveen, G. Nagaraju, Udayabhanu","doi":"10.4028/p-od1t32","DOIUrl":"https://doi.org/10.4028/p-od1t32","url":null,"abstract":"Fundamental and applied research depends on the removal of organic toxic effluents from textile industries. Photocatalytic dye degradation of CuO-NiO nanocomposite has been studied against methylene blue (MB) dye. CuO-NiO nanocomposite has been prepared by hydrothermal method using radish (Raphanus sativus) leaves as green fuel. Prepared composite nanoparticles (NPs) are characterized by XRD, FTIR, UV-DRS and SEM with EDS for the elemental and structural information. XRD data indicated the formation of monoclinic and hexagonal crystallite structures for CuO and NiO respectively. FTIR confirmed the presence of Cu - O and Ni - O molecular vibrations. Surface morphology and elemental composition of composite was analysed by SEM with EDS. CuO-NiO nanocomposite is capable to degrade 70 % of methylene blue (MB) dye in 180 min under UV light interactions. Recyclability is also good even after 4 cycles of degradation experiment for the CuO-NiO composite.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"38 1","pages":"47 - 55"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85812269","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":"Photothermally Triggered Control of the Drug Delivery System Using Doxorubicin-Loaded Mesoporous Silica for Effective Killing of Human Hepatoma Cells","authors":"Ming Li, Yu Han Huang, Yingqiang Qin, Bo Ren, Hong Yu Song, Yanhai Qi","doi":"10.4028/p-g4xep4","DOIUrl":"https://doi.org/10.4028/p-g4xep4","url":null,"abstract":"Photothermal-temperature responsive [Ag nanoparticles-hollow mesoporous silica nanospheres–poly (N-isopropyl acrylamide-acrylic acid)] (Ag@HMSN@PNIPAM-AA) nanoparticles were designed and prepared, and the combination of Ag nanoparticles (AgNPs) and [poly (N-isopropyl acrylamide-acrylic acid)] (PNIPAM-AA) was used as a switch of the photothermal-temperature effect to control drug release. The results of cell culture in vitro showed that [mesoporous silica nanospheres–poly (N-isopropyl acrylamide-acrylic acid)] (MSN@PNIPAM-AA) and Ag@HMSN@PNIPAM-AA nanoparticles had good biocompatibility and less cytotoxicity, and Ag@HMSN@PNIPAM-AA nanoparticles had higher cell inhibition under 808 nm near-infrared light. The combination of near-infrared light and doxorubicin showed higher drug release efficiency and a stronger inhibitory effect on HepG2 cell growth. These characteristics indicate that Ag@HMSN@PNIPAM-AA nanoparticles have great potential for treatment. This study also proved the universal applicability of Ag@HMSN@PNIPAM-AA nanoparticles. Different model drugs and nanoparticles can play different roles and have development potential.","PeriodicalId":7271,"journal":{"name":"Advanced Materials Research","volume":"22 1","pages":"91 - 98"},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86504600","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}