The friction and wear properties between a smooth oxide-based ceramic sliding an amorphous carbon surface are greatly influenced by the chemistry of layer. Like most compounds, oxides can form if is exposed to oxygen. These species desorb as monoxide and/or dioxide under rubbing action slider. Such gradual tribochemical mechanism induces greater area true contact, coefficient increases dramatically from 0.2 1.2 or higher when repeated contacts made. In contrast, similar tribological...

In our study, the surface of bacterial cellulose was successively modified by copper and zinc oxide nanoparticles using direct current (DC) magnetron sputtering radio frequency (RF) reactive sputter coating techniques. The target materials, zinc, were 99.99% pure used in presence argon (Ar) gas, while sputtered oxygen gas to make nanoparticles. as-prepared cellulose/copper/zinc nanocomposite has good ultraviolet resistance, anti-static antibacterial characteristics. morphology chemical...

Bacterial cellulose is the three-dimensional network structure of nanofibers. The bacterial materials have outstanding characteristics high surface area and crystallinity (84%–89%). It has greater compatibility with degree polymerization excellent mechanical properties. water-holding capacity (over 100 ti) makes it stand out from other materials. This because purity due to a lack lignin hemicellulose. considered as non-cytotoxic, non-genotoxic, highly biocompatible material, which broad...

Hydrogenated thin carbon films have been prepared by DC magnetron sputtering in a hydrogen-containing argon HD-09. A monotonic decrease friction buildup as well an increase abrasion resistance is observed for increasing hydrogen addition to the atmosphere, from 0 5%. Raman data show higher sp/sup 3/ character, and content film, monitored with Fourier-transform infrared spectroscopy, observed. Resistivity measurements also transition conductor insulator. For very high content, film becomes...

In recent times, there is a growing demand for low-cost raw materials, renewable resources, and eco-friendly end products. Natural fibers are considered as strong candidates to be used potential reinforcement composite manufacturing. the current study, natural extracted from banana peel were coated with bacterial cellulose through green biosynthesis approach well by simple slurry dipping method. Thus, waste first time, produce cellulose-natural fiber composites. SEM analysis revealed good...

Tribological measurements have been performed on a series of carbon films deposited untextured 95-mm magnetic disks by magnetron sputtering. Raman spectra and resistivity data these correlated to friction wear performance. Tribochemical wear, as estimated the rate frictional buildup, is G-band position in spectrum. Abrasive best I(D)/I(G) intensity ratio D G bands, well electrical resistivity. Interpretation using structural models amorphous discussed.

Some physico-chemical processes taking place at a sliding CaTiO/sub 3/-ceramic/unlubed carbon-film interface of rigid disk drive are described. A major cause frictional buildup is the tribochemical wear carbon surface atoms in oxygen-containing atmosphere. Based on indirect evidence, mechanism involving oxygen chemisorption dangling bonds and CO/CO/sub 2/ desorption under motion read/write head proposed. Raman data providing evidence formation graphite transfer film some films shown....

The authors report on two thin-film-media alloys, Co/sub 86/Cr/sub 12/Ta/sub 2/ and 75/Ni/sub 25/, which have very different noise characteristics. magnetic microstructure of these films was observed with SEMPA (scanning electron microscopy polarization analysis). Anisotropy rotational hysteresis loss measurements been made using a torque magnetometer. distribution anisotropy field H/sub k/ its width dH/sub also measured along normalized values. It is suggested that the can be directly...

The magnetic properties of Ni-Mo metallic superlattices have been examined by magnetization and polarized-neutron diffraction measurements. samples are ferromagnetic, with an ordering temperature rapidly increasing the superlattice period \ensuremath{\Lambda}. saturation per nickel atom also increases \ensuremath{\Lambda}, gradually approaching value pure metal. proximity molybdenum lowers moments a deeper perturbation at imperfections crystalline layers. A comparison x-ray neutron...

Our research aim is to develop a new composite material via electrospinning and dip coating methodology. Among bioabsorbable polymers, Polylactic acid (PLA) viewed as suitable base for biomedical usages such drug delivery wound dressing. Additionally, these materials can be used filtration applications in terms of antibacterial activity the integration hexadecyl trimethyl ammonium chloride-modified montmorillonite (CTAC-MMT) into PLA fibers would improve mechanical absorption properties...

Carbon films prepared by DC magnetron sputtering as an overcoat for rigid-disk thin film media are studied. The tribological or wear performance shows a strong dependence on the process. microstructure of carbon was evaluated using transmission electron microscopy, scanning tunneling and Raman scattering. results show that with better have more uniform grain size distribution higher percentage (2-3%) SP bonded atoms homogeneous work function compared to poor performance. Atomic resolution...

This study investigates the biosynthesis of microbial cellulose–electrospun nano-fibrous membrane hybrid nano-fabric via use a modified bioreactor. Microbial cellulose is known for its high liquid absorbency and hygienic nature. Electrospun membranes, on other hand, exhibit excessive surface hydrophobicity in typical conditions. As such, this research intends to improve hydrophilic property electrospun membranes through situ self-assembly nano-fibrils membrane’s surface. Scanning electron...

This work describes that bacterial cellulose was successively modified by copper/zinc nanoparticles with the help of direct current and radio frequency magnetron sputter-coating method for electromagnetic interference shielding to enhance its hydrophobic, mechanical, conductive properties. The surface morphology properties cellulose/copper/zinc nanocomposite were analyzed various testing methods (X-ray photoelectron spectroscopy, X-ray diffraction) instruments analyze smooth deposition...

Abstract Commercial formulations of low-density polyethylene (LDPE) films were subjected to an outdoor soil burial test investigate the environmental degradation under natural conditions. Samples periodically retrieved from examined for changes in physical character, tensile properties, dielectric behavior, X-ray diffraction pattern and FTIR spectra. Irrespective thickness color, load-extension curves all samples reflect complete or partial destruction plastic elastic regions after 15 17...

Thin CoCrTa/Cr films were deposited at different substrate temperature T/sub s/ and biasing voltage V/sub b/. The in-plane coercivity increased significantly with S/ Coercive squareness orientation ratio also Transmission electron microscopy (TEM) results indicated that, low s/, the magnetic film had an isolated-grain structure, smaller sub-grain structure within each grain. At high a closely packed grain probably due to enhanced adatom mobility; size was much larger striations observed in...

STM (scanning tunneling microscopy) data on carbon overcoats of thin film media are reported. Topographic as well spectroscopic images showing the derivative current I with respect to tip-to-surface distance s (dI/ds) measured simultaneously. Areas large dI/ds fluctuations observed, which attributed regions poor conductivity film. These domains instability become larger at higher current. Carbon films better mechanical properties show greater homogeneity in conductivity. Atomic structures...

Sputtered thin films with compositions consisting of Co/sub 75/NI/sub 25/, (Co/sub 75/Ni/sub 25/)/sub 90/Mo/sub 10/, and 90/Ta/sub 10/ atomic percent were evaluated relative to their magnetic properties as a function thickness. The maximum coercive force at the optimum thickness (<325 AA) was determined be directly proportional saturation magnetization. However, inversely magnetization in thicker (>300-AA) films. Magnetization reversal thick (1000 primarily by domain wall displacement, which...

The effects of partial pressures oxygen, nitrogen and air on sputtered CoCrTa ternary alloys have been studied relative to their microstructure magnetic properties. results show that oxygen affects the crystallinity orientation Co more severely than or air. effect was intermediate between O/sub 2/ N/sub 2/. Introduction in a very large reduction coercive force films. coercivity due is moderate, However, no significant change saturation magnetization values are observed introduction impurity...

The magnetic and recording properties of single multi-magnetic layer media were studied. bulk the samples are similar. Media noise multilayer is significantly lower than that media. Increase in SNR (signal-to-noise ratio) depends on MrT value number layers. For double triple increase ranges from 3.3 to 5.5 dB. Interaction study results using Kelly plot method indicate single-layer characterized by positive interaction, which likely due exchange coupling between grains. By laminating layer,...