Materials Literature
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PURPOSE: The objective of the present investigation was to evaluate the morphologic characteristics of self-assemblies of diamond (nano-D), silver (nano-Ag), gold (nano-Au), and platinum (nano-Pt) nanoparticles with Staphylococcus aureus (bacteria) and Candida albicans (fungi), to determine the possibility of construc…
Rapid innovations in nanomedicine have increased the likelihood that engineered nanomaterials will eventually come in contact with humans and the environment. The advent of nanotechnology has created strong interest in many fields such as biomedical sciences and engineering field. Central to any significant advances i…
Graphite oxide sheet, now referred to as graphene oxide (GO), is the product of chemical oxidation and exfoliation of graphite powders that was first synthesized over a century ago. Interest in this old material has resurged in recent years, especially after the discovery of graphene, as GO is considered a promising p…
Silica nanoparticles (SNPs) are produced on an industrial scale and are an addition to a growing number of commercial products. SNPs also have great potential for a variety of diagnostic and therapeutic applications in medicine. Contrary to the well-studied crystalline micron-sized silica, relatively little informatio…
생분해성 고분자는 제약 및 생명공학 분야에서 많은 관심을 받고 있는 물질로 특히 나노미립구의 형태로 약물전달체의 개발에 널리 이용되고 있다. 본 연구에서는 cyclohexanedimenthanol과 oxalyl chloride를 pyridine의 존재 하에서 반응하여 고분자량의 생분해성 퍼옥살레이트 고분자를 합성하고 그 물리화학적 및 생물학적 특성을 조사하였다. 폴리옥살레이트는 분자량이 약 7500 Da 정도인 반결정성 고분자이며 물에서 가수분해가 일어남을 GPC와 NMR로 확인하였다. 소수성의 폴리옥살레이트는 단일유화법으로 나노미립구로 제조될 수 있으며 약물을 포…
Bacterial cellulose는 초산균인 Cluconacetobacter xylinus에 의해 생산되며. 배양 배지의 표면에 나노섬유상의 막을 형성한다. 본 연구에서는 배지의 조성에서 탄소원을 달리하여 생산한 bacterial cellulose의 결정화도 점도 모폴로지와 역학적 물성을 살펴보았다. Cluconacetolbactersp. V6 균은 세 종류의 배양 배지에서 정치 상태로 배양되었다. 배양 배지로는 표준 Hestrin-Schramm 배지와 탄소원으로 glycerol 또는 molasses를 첨가한 개젤 배지가 각각 시용되었다. 세포 성장과 셀룰로오스…
Las busur listrik atau umumnya disebut dengan las listrik adalah suatu proses penyambungan logam dengan menggunakan tenaga listrik sebagai sumber panas. Pengelasan pada masa sekarang ini sangat berperan penting baik dalam bidang rekayasa, konstruksi maupun perbaikan logam. Dalam melakukan pengelasan banyak faktor yang…
Germanium nanowires (GeNWs) with core−shell structures enhance the long-term chemical and photophysical stability of their surfaces. In this work, the preparation of Ge core nanowires surrounded by a zinc oxide shell containing erbium was achieved through the use of vapor−liquid−solid (VLS) methods followed by vapor t…
Rod shaped Nickel nanoparticles of size 20 to 25 nanometer were synthesized in the micellar cavity by reverse micelle method. X-Ray diffraction, TEM and FT-IR spectroscopic techniques were used to characterize Nickel nanoparticles. Antibacterial activity of Nickel nanoparticles was tested on six different bacteria i.e…
Porous mullite-bonded SiC (MBSC) ceramics were fabricated at temperatures ranging from 1400 to 1500 o C for 2 h using silicon carbide (SiC), alumina (Al 2 O 3 ), strontium oxide (SrO), and poly (methyl methacrylate-coethylene glycol dimethacrylate) (PMMA) microbeads. The effect of template content on porosity, pore mo…
By using liquid metal cooling method, the Ni-based superalloy DZ125 was directionally solidified under planar interface growth condition of drawing rate of 1.5 μm/s. The microstructures at different solidified fractions were examined by OM and SEM. The results showed that the solid/liquid interface is planar and the m…
Atomic force microscopy and electron microscopy with energy dispersive X-ray analysis was used to characterize changes in the structure and composition of (LSM) nanoparticles supported on single crystal YSZ(100) (yttria-stabilized zirconia) and surfaces as a function of temperature and exposure to oxidizing and reduci…
Analysis of emission characteristics of a nanostructured porous carbon material measured in pulsed electric field demonstrated that their hysteresis complies with two-barrier emission model in the additional assumption that electron transport through the internal barrier is controlled by electric charging of the surfa…
An efficient and improved procedure for the synthesis of benzopyran derivatives has been achieved with Keggin-type and Preyssler-type heteropolyacids (HPA) catalysts in one-pot reaction under solvent-free conditions.
Transmission electron microscopy (TEM) is the main technique used to investigate the spatial distribution of clay platelets in polymer nanocomposites, but it has not often been successfully used in polymer blend nanocomposites because the high contrast between polymer phases impairs the observation of clay platelets.…
In this work, 0-3 lead zirconate titanate (PZT) was mixed with normal Portland cement to produce 0-3 connectivity composites. The effect of temperature on the dielectric properties such as the dielectric constant and dielectric loss was determined. It was found that with increasing PZT content the Tc increases where t…
A microtubular solid oxide fuel cell (SOFC) bundle was developed based on a new design. Anode-supported microtubular SOFCs with the cell configuration, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF)-Ce0.9Gd0.1O1.95 (CGO) cathode/CGO electrolyte/Ni-CGO anode were fabricated and bundled in a porous LSCF current-collecting cube with side…
A small-sized X-ray tube with a carbon nanotube planar field electron emitter has been manufactured and tested. Field electron emitter was grown by the chemical vapor deposition (CVD) method on a nickel substrate. During long time tests (more than 50 hours) the X-ray tube has demonstrated stable characteristics of the…
Water (H 2 O) is often perceived to be a perfectly ordinary substance because it is transparent, odorless, tasteless, and ubiquitous. We interact with it all the time in our everyday lives, and it is, not surprisingly, the most studied material on earth. Unfortunately, we often erroneously think that the properties of…
In recent years, Brazilian Nuclear Programme has been reviewed and updated by government authorities in face of the demand for energy supply and its associated environmental constraints. The immediate impact of new national programmes and projects in nuclear field is the increase in the number of exposed personnel and…