• Thermal and Mechanical Properties of Chitosan/SiO2 Hybrid Composites

    Updated: 2010-02-28 15:39:39
    Chitosan-silica (CSSi) hybrid films have been fabricated by sol-gel process using tetraethoxysilane (TEOS) as precursor. The structure of the resulting hybrid has been characterized by Fourier transform infrared spectroscopy (FTIR). Fracture surface has been revealed through a field emission-scanning electron microscopy/energy dispersive spectrometer (FE-SEM/EDS) to probe the dispersion degree and the size of SiO2 particle. Study of morphology using a SEM micrograph and the High Resolution Transmission Electron Microscopy (HRTEM) images of the nanocomposite films suggests that the SiO2 nanoparticles are within the range of 2–7 nm in diameter and are uniformly dispersed in the polymer matrix. Thermal properties of these composite materials have been studied as a function of sil...MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Editors for Scripta Materialia

    Updated: 2010-02-26 16:05:14
    (Source: Scripta Materialia)

  • Crystal control moves towards 3D displays

    Updated: 2010-02-24 18:00:00
    Doping nanocrystals changes the colours they emit

  • Relationship between mechanical properties of one-step self-etch adhesives and water sorption

    Updated: 2010-02-24 16:29:12
    Abstract: Objectives: The purpose of this study was to evaluate the relationship between changes in the modulus of elasticity and ultimate tensile strength of one-step self-etch adhesives, and their degree of water sorption.Methods: Five one-step self-etch adhesives, Xeno IV (Dentsply Caulk), G Bond (GC Corp.), Clearfil S3 Bond (Kuraray Medical Inc.), Bond Force (Tokuyama Dental Corp.), and One-Up Bond F Plus (Tokuyama Dental Corp.) were used. Ten dumbelled-shaped polymers of each adhesive were used to obtain the modulus of elasticity by the three-point flexural bending test and the ultimate tensile strength by microtensile testing. The modulus of elasticity and the ultimate tensile strength were measured in both dry and wet conditions before/after immersion in water for 24h. Water sorptio...

  • Physical properties of a new silorane-based restorative system

    Updated: 2010-02-24 16:29:12
    Abstract: Objectives: To distinguish the physical properties of a new silorane-based restorative material in comparison to five methacrylate-based restorative materials – a compomer, giomer, nanocomposite, hybrid and micro-hybrid.Methods: The following properties were examined per restorative material: compressive strength, diametral tensile strength, flexural strength/modulus, fracture toughness, microhardness, and polymerization shrinkage. The mean and standard deviation were determined per group. A one-way ANOVA/Tukey was performed per property (α=0.05).Results: Significant differences were found between groups per property (p (Source: Dental Materials)<iMedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Quantification of dental erosion—A comparison of stylus profilometry and confocal laser scanning microscopy (CLSM)

    Updated: 2010-02-24 16:29:12
    Abstract: Objectives: Since stylus profilometry applies a force on the sample surface, it is logical to hypothesize that the profilometer penetrates the surface of the enamel softened by acid solutions. The aims of the present study were, therefore, to test the hypothesis that surface profilometry measurements of eroded enamel alter the surface of the enamel, to quantify the potential effect of the surface alteration (scratches) on the measured values of enamel erosion by atomic force microscopy and to compare the values of enamel loss caused by erosion as measured by profilometry and non-contact confocal laser scanning microscopy (CLSM).Methods: Enamel samples, cut from unerupted human third molars were treated with Volvic Mineral Water and citric acid solutions of different pH values. Th...

  • Surface deterioration of dental materials after simulated toothbrushing in relation to brushing time and load

    Updated: 2010-02-24 16:29:12
    Abstract: Objectives: (1) To evaluate the changes in surface roughness and gloss after simulated toothbrushing of 9 composite materials and 2 ceramic materials in relation to brushing time and load in vitro; (2) to assess the relationship between surface gloss and surface roughness.Methods: Eight flat specimens of composite materials (microfilled: Adoro, Filtek Supreme, Heliomolar; microhybrid: Four Seasons, Tetric EvoCeram; hybrid: Compoglass F, Targis, Tetric Ceram; macrohybrid: Grandio), two ceramic materials (IPS d.SIGN and IPS Empress polished) were fabricated according to the manufacturer's instructions and optimally polished with up to 4000 grit SiC. The specimens were subjected to a toothbrushing (TB) simulation device (Willytec) with rotating movements, toothpaste slurry and at th...

  • Digitally Encoded Optical Fiber Video Converter with Bi-directional Data

    Updated: 2010-02-24 15:52:02
    It is a modulized products incorporating all-digital encoding technology,it can fit into the chassis, used in security applications.

  • Optical Fiber Coater

    Updated: 2010-02-24 15:51:48
    It restores the primary coating on spliced optical fibers with acrylate coatings. The fiber is automatically centered when it is inserted into the mold.

  • Fiber Optic Splice Shelf

    Updated: 2010-02-24 15:51:34
    it is designed to provide a convenient in-rack splicing and interconnection point for outside plant cable.

  • Waterproof Optical Fiber Distribution Hub

    Updated: 2010-02-24 15:51:24
    It is designed to provide a local convergence point in the outside plant environment, housing splitters that link feeder cables from the center office to distribution cables serving customer premises.

  • Fiber Optic Video Transceiver with bi-directional Data, Audio

    Updated: 2010-02-24 15:51:13
    This module incorporates an all-digital encoding technology that transmits one real-time,10 bit composite video,duplex 24 bit audio and serial data.

  • Unidirectional Optical Fiber Video Converter

    Updated: 2010-02-24 15:50:59
    It is a reliable, cost effective, state-of-the-art, one fiber video and data or audio transmission system.

  • Optical Fiber Mechanical Splice Tool

    Updated: 2010-02-24 15:50:42
    Using V-groove technology,this product is a mechanical splice that provides an inexpensive, quick alternative to mating fibers.

  • Editors for Scripta Materialia

    Updated: 2010-02-22 16:19:21
    (Source: Scripta Materialia)

  • A platinum-chromium steel for cardiovascular stents.

    Updated: 2010-02-21 23:00:00
    Authors: O'Brien BJ, Stinson JS, Larsen SR, Eppihimer MJ, Carroll WM The desire to reduce the strut thickness of cardiovascular stents has driven the development of a new high strength radiopaque alloy, based on additions of platinum to a chromium-rich iron based matrix. This paper reports on initial development of the alloy and the rationale for selection of the composition. Data is presented for tensile and microstructural characterization, surface oxide analysis, corrosion resistance and endothelial cell response of the alloy. The results demonstrate the solid solution strengthening effect of the platinum, with an average yield strength of 480 MPa achieved. The material surface consists of primarily chromium oxide which contributes to the high corrosion resistance observed. The cell...

  • Symposium on low dimensional systems and Workshop on Complex Systems

    Updated: 2010-02-21 00:00:00
    Workshop: 7 Jun 2010 - 11 Jun 2010, La Habana, Cuba.

  • New Frontiers in Complex Networks: A Statphys24 Satellite Meeting

    Updated: 2010-02-20 00:00:00
    Conference: 12 Jul 2010 - 16 Jul 2010, Seoul, Korea, Republic of.

  • InnoCentive Challenges Physical Sciences_Outlets for untapped skills, supplimentary work and recogition and revenue

    Updated: 2010-02-19 13:38:00
    : , Materials Science and Engineering Defined Materials Science and Engineering : Durable Development , Sustainable Development,Physical,Chemical,Processing , Applications , R and D to Market , Smart Materials , Coatings , Micro-Nano Technology My professional profile on Linkedin About Me James ALEXANDER I am an honours graduate , senior Metallurgist Materials Scientist and Engineer turned Consultant and Blogger , Bilingual English-French Read my weblog and post a comment is certainly the best way to get to know . me Comments are Mediated . Confidentiality can be guaranteed , as requested during mediating , for example if english is a foreign language and leads to unnecessary difficulty entirely free english communication help provided Life’s tough enough . So avoid SPAM FRANCAIS : écrit , lu et . parlé Commentaires en français acceptés , alors , n'hésitez pas , si cela vous rendre la vie plus facile . Work assignments will be given full consideration-Etudie toutes propositions de travail . MY LOCALITY MAP View my complete profile Click , Share , Grab Build YOUR Own Wowzio grab this education blog Get the Materials Science and Engineering Defined widget and many other great free

  • Nano Measure 2010

    Updated: 2010-02-19 00:00:00
    Lecture/talk: 6 Mar 2010 - 6 Apr 2010, Krakow, Poland. Organized by Agilent Technologies.

  • Synthesis, characterization and biodegradation of functionalized amino acid-based poly(ester amide)s.

    Updated: 2010-02-17 23:00:00
    Authors: Pang X, Chu CC A series of biodegradable functional amino acid-based poly(ester amide)s (PEA-AG) were designed and synthesized by the solution co-polycondensation of amino acid (l-phenylalanine and dl-2-allylglycine) based monomers and dicarboxylic acid based monomers. Pendant carbon-carbon double bonds located in the dl-2-allylglycine were incorporated into these PEA-AGs, and the double bond contents could be adjusted by tuning the feed ratio of l-phenylalanine to dl-2-allylglycine monomers. Chemical structures of this new functional PEA-AG family were confirmed by FTIR and NMR spectra. The thermal properties of these polymers were investigated; increasing the methylene chain in both the amino acid and dicarboxlic acid segments resulted in a reduction in the polymer glass-tra...

  • Polymers in Medicine 2012

    Updated: 2010-02-17 00:00:00
    Conference: 8 Jul 2012 - 12 Jul 2012, Prague, Czech Republic. Organized by Institute of Macromolecular Chemistry AS CR, v.v.i..

  • Recent advances in broad-band solid-state NMR of correlated electronic systems

    Updated: 2010-02-17 00:00:00
    Workshop: 5 Sep 2010 - 10 Sep 2010, Trogir, Croatia.

  • Contemporary Ways to Tailor-made Polymers - Modern Methods of Polymer Synthesis

    Updated: 2010-02-17 00:00:00
    Conference: 18 Jul 2010 - 22 Jul 2010, Prague, Czech Republic. Organized by Institute of Macromolecular Chemistry AS CR, v.v.i..

  • ISC International Supercomputing Conference

    Updated: 2010-02-16 00:00:00
    Conference/exhibition: 30 May 2010 - 3 Jun 2010, Germany. Organized by Prometeus GmbH.

  • Corrigendum to “Inducement of bainite and carbide transformation from retained austenite based on a high strain rate” [Scr. Mater. 62 (2010) 372–375]

    Updated: 2010-02-15 23:00:00
    The author regrets that the captions for Figs. 3 and 4 on page 3 are incorrect. Please find the correct captions listed below: Fig. 3. (a) Microstructure of upper bainite (b) in which the carbide M7C3 precipitates with zone axis after impact at a strain rate of 1×103s−1. (Source: Scripta Materialia)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Editors for Acta Materialia

    Updated: 2010-02-15 15:33:44
    (Source: Acta Materialia)

  • Synthesis of Carbon Nanotubes and Nanofibers on Silica and Cement Matrix Materials

    Updated: 2010-02-15 15:33:36
    In order to create strong composite materials, a good dispersion of carbon nanotubes (CNTs) and nanofibers (CNFs) in a matrix material must be obtained. We proposed a simple method of growing the desirable carbon nanomaterial directly on the surface of matrix particles. CNTs and CNFs were synthesised on the surface of model object, silica fume particles impregnated by iron salt, and directly on pristine cement particles, naturally containing iron oxide. Acetylene was successfully utilised as a carbon source in the temperature range from 550 to 750∘C. 5–10 walled CNTs with diameters of 10–15 nm at 600∘C and 12–20 nm at 750∘C were synthesised on silica particles. In case of cement particles, mainly CNFs with a diameter of around 30 ...MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Imaging 2010

    Updated: 2010-02-15 00:00:00
    Conference: 8 Jun 2010 - 11 Jun 2010, Stockholm, Sweden. Organized by Royal Institute of Technology.

  • Dynamics Days Europe 2010

    Updated: 2010-02-15 00:00:00
    Conference: 6 Sep 2010 - 10 Oct 2010, Bristol, United Kingdom.

  • Improvement of the microstructure and mechanical properties of bioceramic scaffolds using electrohydrodynamic spraying with template modification.

    Updated: 2010-02-12 04:48:20
    Authors: Muthutantri AI, Edirisinghe MJ, Boccaccini AR Porous scaffolds play a key role in tissue engineering (TE) approaches and new processing methods and materials are constantly being developed to cater for the wide range of specifications and requirements. Electrospraying is a relatively new processing method used for producing open-pore scaffolds. In this work, the electrospraying technique was manipulated to make the process more efficient, and the effect of spraying time on the pore size and strut thickness of zirconia scaffolds was explored. Scaffolds of adequate pore size and interconnectivity, with an average compressive strength of approximately 7.5 MPa, by electrospraying for only 10 min are reported. The effect of modifying the sacrificial template on the microstructure a...

  • Mechanical evaluation of porous titanium (Ti6Al4V) structures with electron beam melting (EBM).

    Updated: 2010-02-12 04:48:14
    In conclusion, from a mechanical strength viewpoint, we have found that the porous structures produced by the electron beam melting process present a promising rapid manufacturing process for the direct fabrication of customized titanium implants for enabling personalized medicine. PMID: 20142109 [PubMed - as supplied by publisher] (Source: Journal of the Mechanical Behavior of Biomedical Materials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • The electron beam deposition of titanium on polyetheretherketone (PEEK) and the resulting enhanced biological properties.

    Updated: 2010-02-11 23:00:00
    Authors: Han CM, Lee EJ, Kim HE, Koh YH, Kim KN, Ha Y, Kuh SU The surface of polyetheretherketone (PEEK) was coated with a pure titanium (Ti) layer using an electron beam (e-beam) deposition method in order to enhance its biocompatibility and adhesion to bone tissue. The e-beam deposition method was a low-temperature coating process that formed a dense, uniform and well crystallized Ti layer without deteriorating the characteristics of the PEEK implant. The Ti coating layer strongly adhered to the substrate and remarkably enhanced its wettability. The Ti-coated samples were evaluated in terms of their in vitro cellular behaviors and in vivo osteointegration, and the results were compared to a pure PEEK substrate. The level of proliferation of the cells (MC3T3-E1) was measured using a m...

  • Growth Mechanism of Cubic-Silicon Carbide Nanowires

    Updated: 2010-02-11 15:52:25
    Cubic-SiC nanowires were synthesized using activated carbon powder and Si substrate in vacuum at 1200–1350°C for 1–4 hours. The nanowires were grown according to the following proposed mechanisms: (1) diffusion of C/CO into Si substrate, (2) weakening of Si bond and atomic kick-out, (3) formation of Si-C in vapor phase, (4) formation of saturated SiC layer, (5) formation of pyramid-like SiC nanostructure, and (6) formation of SiC nanowires. (Source: Journal of Nanomaterials)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Link: Technology Vision 2020 - Materials and Processing - India

    Updated: 2010-02-10 00:58:00
    Technology Vision 2020 - Materials & Processing - India

  • Gravitational Lensing Workshop

    Updated: 2010-02-10 00:00:00
    Workshop: 2 Apr 2010, Tampa, Florida, United States. Organized by Prof. Dima Khavinson.

  • Multiscale modelling of materials,MMM - Introduction and Explanatory Notes; Refs.,Images, on a Hot Interdisciplinary field

    Updated: 2010-02-09 15:45:00
    : . , Materials Science and Engineering Defined Materials Science and Engineering : Durable Development , Sustainable Development,Physical,Chemical,Processing , Applications , R and D to Market , Smart Materials , Coatings , Micro-Nano Technology My professional profile on Linkedin About Me James ALEXANDER I am an honours graduate , senior Metallurgist Materials Scientist and Engineer turned Consultant and Blogger , Bilingual English-French Read my weblog and post a comment is certainly the best way to get to know . me Comments are Mediated . Confidentiality can be guaranteed , as requested during mediating , for example if english is a foreign language and leads to unnecessary difficulty entirely free english communication help provided Life’s tough enough . So avoid SPAM FRANCAIS : écrit , lu et . parlé Commentaires en français acceptés , alors , n'hésitez pas , si cela vous rendre la vie plus facile . Work assignments will be given full consideration-Etudie toutes propositions de travail . MY LOCALITY MAP View my complete profile Click , Share , Grab Build YOUR Own Wowzio grab this education blog Get the Materials Science and Engineering Defined widget and many other great free

  • Cytocompatibility and Effect of Increasing MgO Content in a Range of Quaternary Invert Phosphate-based Glasses

    Updated: 2010-02-04 16:13:41
    In this study, four invert PBG formulations (in the system P2O5—CaO—MgO—Na 2O) were produced with fixed phosphate and calcium content at 40 and 25 mol%, respectively. MgO was added at 10—30 mol% in place of Na 2O and the maximum divalent cation to phosphate ratio obtained was 1.375. Thermal analyses showed a linear increase in Tg with increasing MgO content. This was proposed to be due to an increase in the cross-link density of the glass network, which also improved the chemical durability of the glass. EDX analyses were also conducted to verify the final composition of the glass. XRD analyses confirmed the amorphous nature of the glasses investigated. Rapid quenching of the Mg30 glass revealed a degree of surface crystallization, which was shown to be a CaMgP2O7 p...

  • Preparation, Characterization, and In Vitro and In Vivo Evaluation of Cellulose/Soy Protein Isolate Composite Sponges

    Updated: 2010-02-04 16:13:41
    A series of cellulose/soy protein isolate (SPI) sponges was prepared using a freeze-drying process. The effect of the SPI content on the structure of the sponges was characterized by Fourier transform infrared spectrometry (FT-IR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). It showed that the sponges were porous in structure, and that the size of the pores increased and the thickness of the pore walls decreased as the SPI content of the sponges increased. The biocompatibility and biodegradability of the sponges were evaluated in vitro and in vivo. The cell culture experiment and SEM observations showed that L929 fibroblast cells grew and spread well on the surface and cross-section of the composite sponges. The results from MTT (3-[4,5-dimethyl-2-thiazoly1]-2,...

  • Strontium-based Glass Polyalkenoate Cements for Luting Applications in the Skeleton

    Updated: 2010-02-04 16:13:41
    In this study GPCs based on Sr-Ca-Zn-SiO 2 glasses and low molecular weight PAA were evaluated for orthopaedic luting applications. GPCs based on four different glasses; BT100 (0.16CaO, 0.36ZnO, 0.48SiO2), BT101 (0.04SrO, 0.12CaO, 0.36ZnO, 0.48SiO 2), BT102 (0.08SrO 0.08CaO, 0.36ZnO, 0.48SiO2) and BT103 (0.12SrO 0.04CaO, 0.36ZnO, 0.48SiO2) and two PAAs (MW; 12,700 and 25,700) were examined. These cement formulations exhibited handling properties potentially suitable for luting applications as well as mechanical strengths which were similar to those of trabecular bone. Upon immersion in simulated body fluid, the GPCs showed sustained growth of a calcium phosphate layer on the surface of the cement indicating that these cements were bioactive in nature. (Source: Journal of Biomaterials Appli...

  • Thanks to Reviewers

    Updated: 2010-02-04 16:00:37
    (Source: Journal of Biomaterials Applications)

  • Preparation and Evaluation of Dental Resin Luting Agents with Increasing Content of Bisphenol-A Ethoxylated Dimethacrylate

    Updated: 2010-02-04 16:00:37
    Resin luting agents in which bisphenol-A glycidyl dimethacrylate (Bis-GMA) and/or triethylene glycol dimethacrylate (TEGDMA) are replaced with increasing amounts of bisphenol-A ethoxylated dimethacrylate are prepared. Degree of conversion (DC), diametral tensile strength (DTS), Young’ modulus (YM), Knoop hardness (KHN), film thickness (FT), water sorption (Wsp ), and solubility are evaluated. Regression analyses investigate the substitution of each monomer. The most appreciable differences are detected when TEGDMA is replaced: decreased DC, DTS, and Wsp, and increased YM, KHN, and FT. For substitution of Bis-GMA, the only significant differences are reduced Wsp and increased YM. An ideal formulation of resin cement would make use of the three monomers. (Source: Journal of Biomateria...

  • Novel Polymeric Coatings with the Potential to Control In-stent Restenosis -- An In Vitro Study

    Updated: 2010-02-04 16:00:37
    This study evaluates the influence of polymer coatings on human aortic endothelial cells (HAEC) and coronary artery smooth muscle cells (HCASMC) in vitro, in terms of morphology, cell number, and phenotype. It was demonstrated that the polymer coatings can be tailored to enhance adhesion and growth of HAECs whilst suppressing that of HCASMCs. It is concluded that one of the polymer coatings (BTL 01015) shows potential as a stent coating to enhance re-endothelialization. (Source: Journal of Biomaterials Applications)MedWorm Message: Get the very latest Swine Flu news via the MedWorm Swine Flu RSS news feed - updated hourly from thousands of authoritative health and news sources.

  • Synthesis and Application of Novel Multi-arm Poly(carboxylic acid)s for Glass-ionomer Restoratives

    Updated: 2010-02-04 16:00:37
    We have developed a novel glass-ionomer cement system composed of multi-arm poly(acrylic acid-co-itaconic acid)s. These polyacids were synthesized via a chain-transfer polymerization reaction using newly synthesized multi-arm chain-transfer agents. The cements formulated with the multi-arm polyacids showed significantly lower viscosities in water as compared to those formulated with the linear polyacids. Due to the lower viscosities, the MW of the polyacids can be significantly increased for enhanced mechanical strengths, while keeping the ease of mixing and handling. The experimental cements showed significantly improved compressive strengths as compared to Fuji II after aged in water for 3 months. (Source: Journal of Biomaterials Applications)

  • Covalent Surface Heparinization Potentiates Porous Polyurethane Scaffold Vascularization

    Updated: 2010-02-04 16:00:37
    Porous scaffolds play an integral role in many tissue-engineering approaches, and the ability to improve vascularization, without eliciting an excessive inflammatory response, would constitute an important step towards achieving long-term healing and function of devices made from these materials. After having previously optimized the dimensional requirements of the well-defined pores, the present study aimed at a further shift from inflammation to vascularization via surface immobilization with heparin. Porous polyurethane disks were produced to contain well-defined pores (147 ± 2 µm) with abundant interconnecting windows (67 ± 2 µm). After heparinization via copolymer grafting and amination to contain 32 µg of heparin, the modification appeared as a uniform...

  • A degradable soybean-based biomaterial used effectively as a bone filler in vivo in a rabbit

    Updated: 2010-02-02 23:00:00
    Author(s): Antonio Merolli, Luigi Nicolais, Luigi Ambrosio and Matteo SantinAffiliation(s): Department of Orthopaedic Surgery, The Catholic University in Rome, Complesso Columbus, via Moscati 31, 00168 Rome, Italy; Institute of Composite and Biomedical Materials, Consiglio Nazionale delle Ricerche, Piazzale Tecchio 80, 80130 Napoli, Italy; School of Pharmacy and Biomolecular Sciences, University of Brighton, Cockcroft Building, Lewes Road, Brighton BN2 4 GJ, UK (Source: Biomedical Materials)

  • Effect of element concentration on nickel release from dental alloys using a novel ion beam method

    Updated: 2010-02-01 17:00:03
    Abstract: Objectives: Nickel chromium is widely used as a restorative material in dentistry but its biocompatibility is of concern as there are reports of patients suffering adverse effects caused by exposure to nickel-based restorations. The aim of this work was to quantify the amount of nickel released into solution from commercially available nickel-based alloys with varying compositions and to identify the potential use of thin films in further understanding the role of chromium in reducing nickel release.Methods: Six commercially available nickel-based alloys were cast using the lost wax technique. Nickel chromium thin films were deposited onto silicon substrates by ion beam assisted physical vapor deposition. Both types of alloys were immersed into solution representative of saliva a...

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