Materials Literature
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We probe the local inhomogeneities of the electronic properties of graphene at the nanoscale using scanning probe microscopy techniques. First, we focus on the study of the electronic inhomogeneities caused by the graphene-substrate interaction in graphene samples exfoliated on silicon oxide. We find that charged impu…
Natural fiber reinforced plastics (NFRP) is one of the advanced technologies developed in the engineering material industry. The examples of NFRP are kenaf fiber reinforced polypropylene (PP) composites; pineapple leaf fiber reinforced highdensity polyethylene (HDPE), and others. The advantages of NFRP are biodegradab…
Background: Some physical factors may facilitate the entry of chemotherapeutic drugs to the cells. In this study, permeability level of tumor cells of murine breast adenocarcinoma to Bleomycin was compared with 5 minutes ultrasonic exposure vs. magnetic field of 3.5 Tesla in Balb/c mice.Materials and Methods: In this…
천연 흑연으로부터 Graphene oxide(GO)를 합성한 후 diisocyanatodicyclohexylmethane(H12MDI)를 이용 하여 GO의 표면을 기능화하였고, hydrazine monohydrate에 의한 환원을 통해 isocyanate-graphene sheet (i-RGO)를 얻었다. 폴리우레탄과 적합한 나노복합체를 형성하기 위하여 GO, i-RGO, 천연흑연 및 열적환원된 gra-phene을 서로 비교분석하였으며, i-RGO가 가장 적합한 나노충전제로 선정되었다. 선정된 i-RGO의 함량에 따른폴리우레탄의 물성 향상을 확인하기 위하여 충전제의…
In this work, the influence of air pressure during the annealing of Ge quantum dot (QD) lattices embedded in an amorphous Al2O3 matrix on the structural, morphological and compositional properties of the film is studied. The formation of a regularly ordered void lattice after performing a thermal annealing process is…
Abstract : This report discusses research efforts at the Natick Soldier Research Development and Engineering Center (NSRDEC), from 2005 to September 2007, (1) to utilize biomimetic agents to precipitate the metal oxides titania and alumina, (2) to entrap biological agents within the matrixes of these oxides, and (3) t…
Ti6Al4V (grade 5) with different addition contents of wt.% yttrium (Y) element were fabricated successfully using FFC Cambridge process and the effects of Y content on the mechanical and physical properties of the alloys were investigated. Titanium alloy are broadly used in various application such as in the aerospace…
This work aims at studying the post – heating behavior of normal strength concrete (NSC), high strength concrete (HSC) and lightweight concrete (LWC) slabs and assessing the residual punching shear strength of two-way slab specimens. Eleven reduced scale reinforced concrete slab specimens divided into three main group…
The impact of Multi Wall Carbon Nano Tubes addition on mechanical properties, water absorption and thickness swelling of polypropylene/old corrugated container (OCC) fiber composites was investigated. Polypropylene/ OCC fiber composite was prepared using 30% OCC fiber, 67% polypropylene and 3% MAPP. Three levels of mu…
Effects of acetylation and press time on heat transfer to the core layer of particleboard mat in hot pressing were investigated. Particleboard was made using hornbeam particles. Particles were soaked in acetic anhydride for 24 hours to reach three degrees of acetylation (8, 12 and 17%). The treated particles were heat…
The objective of this study focuses on the characterization of poly ether ether ketone (PEEK) membranes for direct methanol fuel cells (DMFC) application. The PEEK membrane was modified with sulfonation in NMP solvent. The characterized of membrane were done using Scanning Electron Microscopy (SEM), water uptake, meth…
Tungsten karbür-kobalt kaplamalar yüksek aşınma direncinin gerekli olduğu pek \nçok endüstriyel uygulamada yaygın olarak kullanılmaktadır. WC-Co kaplamaları \nuygulamak için plazma sprey gibi termal sprey işlemleri kullanılmaktadır. Fakat elde \nedilen kaplamaların özellikleri sprey parametrelerine göre büyük değişikl…
Creep damage is a critical degradation mechanism in reformer tubes which experienced prolonged service periods at elevated temperature. Thus, continuous monitoring of creep is vital in ensuring plant integrity. Since creep damage relates to the changes in microstructure, characterization of creep using common ultrason…
National audience
Abstract : There was a steady increase in average flake size in the years following the initial isolation of monolayer grapheme in 2004, but even by 2008, flakes rarely exceeded 1000 sq microns. As part of the research for this grant, carefully analyzed the factors that affect flake size, including: graphite source (n…
Ionic- (iGG-MA) and photo-crosslinked (phGG-MA) methacrylated gellan gum hydrogels have been proposed as biomaterials for supporting nucleus pulposus (NP) regeneration and/or repair. In this study, the mechanical stability and biocompatibility of these hydrogels have been evaluated in vitro. Human intervertebral disc…
National audience
Corrective Action Unit (CAU) 105 is located in Area 2 of the Nevada National Security Site, which is approximately 65 miles northwest of Las Vegas, Nevada. CAU 105 is a geographical grouping of sites where there has been a suspected release of contamination associated with atmospheric nuclear testing. This document de…
The influence of reinforcing fibers (old corrugated container fibers called OCC) and addition of foaming agents (Azodicarbinamide and sodium bicarbonate) on density, strength properties and dimensional stability of OCC fiber/polypropylene composite were investigated. Conten of reinforcing fibers constant at 20% and th…
International audience