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  • 1
    Electronic Resource
    Electronic Resource
    Slip sliding away: A novel head–disk interface and its tribology (invited) (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5383-5388 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The continuous reduction of head–disk spacing has made the use of supersmooth media a necessity in gaining ultrahigh magnetic recording areal density. To overcome the stiction barrier associated with supersmooth disks without compromising the head flyability requirement, texture features can be transferred from the disk surface to the slider surface, creating a new type of head–disk interface, the padded slider interface. The tribology of a padded slider interface is in many ways different from that of the traditional head–disk interface with texture on the disk only. In this article, various unique tribological aspects of the padded slider interface are discussed in detail. Both theoretical modeling results and experimental data are presented to elucidate the stiction, friction, and wear behaviors of this novel head–disk interface. It is shown that the padded slider technology offers a viable alternative to the ramp load technology as a head–disk interface solution for the ultrahigh areal density. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373352
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  • 2
    Electronic Resource
    Electronic Resource
    A study of dynamic friction at the head–disk interface (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6152-6154 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: With its precisely controlled contact geometry, the head–disk interface with laser zone texture affords a model system for the study of dynamic friction. By using two types of head sliders, i.e., the conventional slider and the padded slider, and a matrix of hard disks with a wide range of laser zone texture parameters, head–disk contacts involving a small number as well as a large number of bumps are realized. A rich variety of dynamic friction behavior is observed with respect to bump height and bump density dependence. A satisfactory explanation of these friction behaviors requires that both the deformational component and the adhesive component of friction be considered on equal footings. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372639
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A stiction model for a head-disk interface of a rigid disk drive (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4206-4217 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical stiction model for a head–disk interface has been developed that takes into account local redistribution of lubricant due to the competition between the capillary pressure inside a meniscus and the disjoining pressure outside the meniscus. Equations for calculating meniscus force and resulting stiction have been obtained for various contacting geometries and lubrication states. The model has been applied to study the effects of disk variables on stiction. Two categories of texture are considered: One has a uniform asperity height (the regular texture) and the other has a Gaussian asperity height distribution (the random texture). The relationship between stiction and the real area of contact is found to be nonmonotonic. The minimum stiction is predicted to occur at intermediate values of the real area of contact. The model also predicts a complicated interdependence between roughness parameters and their role on stiction. The role of lubricant and overcoat on stiction is also considered. Not only the lubricant film thickness, but also the physical and chemical properties of both lubricant and overcoat, as well as the interactions between them, are found to be crucial in determining stiction. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359882
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  • 4
    Electronic Resource
    Electronic Resource
    Evaluation of effectiveness of pretreating rice straw with n-butylamine for improvement of sugar yield (1985)
    Springer
    Applied microbiology and biotechnology 22 (1985), S. 19-25 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary n-Butylamine (n-BA) pretreatment extracted a part of the holocellulose (cellulose and hemicellulose) in rice straw into the liquid phase, as a mixture of oligosaccharides and a small amount of monosaccharides. However, there was loss of sugars resulting mainly from decomposition of monomers by a long exposure to a high n-BA concentration. Approximately 70% of the total sugars in the pretreatment solutions was converted enzymatically into reducing sugars (mainly monomers). On the other hand, more than 90% of holocellulose in the residual rice straw after the optimal pretreatment was solubilized enzymatically in 120 h of reaction time with 10 w/v% substrate and 6 mg protein/ml cellulase. The main action of n-BA on rice straw was delignification, and highly crystalline cellulose was not swollen. Thus the enhancement of the enzymatic solubilization rate of rice straw appeared to be due to the increase of surface area accessible to the enzyme by delignification. It was demonstrated by the relationship of the vapour-liquid equilibrium of the n-BA/water system that the n-BA used was recovered easily. The loss of n-BA, at most, was 30% in the case of the weight ratio of n-BA to rice straw of 0.1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252151
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  • 5
    Electronic Resource
    Electronic Resource
    Optimal conditions for pretreatment of rice straw with n-butylamine for enzymatic solubilization (1985)
    Springer
    Applied microbiology and biotechnology 22 (1985), S. 13-18 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Three different pretreatment methods with n-butylamine (n-BA) were used to obtain fermentable sugars in a high yield from rice straw. The optimal conditions of each method were as follows: treating at boiling point for 1 h under refluxing in 10 w/w% n-BA with the weight ratio of n-BA to original rice straw more than 1.0, autoclaving at 120°C for 1 h in 1 w/w% n-BA with the weight ratio more than 0.1, and wetting for 2 h with the circulating condensate of the vapour evaporated from 2.5 w/w% n-BA with the weight ratio more than 0.8. Soaking rice straw with n-BA before the above pretreatments was not needed. For the circulation pretreatment, the overall cumulative yield of total sugars (70% of cellulose and hemicellulose in original rice straw) was best for both pretreatment and enzymatic solubilization steps, because there was no decomposition of monosaccharides during the pretreatment. Furthermore, the optimal degree of delignification for enzymatic solubilization of the pretreated rice straw was approximately 60% of lignin in the original.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252150
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Spreading of PFPE lubricants on carbon surfaces: effect of hydrogen and nitrogen content (1999)
    Springer
    Tribology letters 6 (1999), S. 9-14 
    Details
    ISSN: 1573-2711
    Keywords: surface diffusion ; spreading ; boundary lubrication ; amorphous carbon film ; PFPE ; scanning micro-ellipsometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The spreading of OH-terminated perfluoropolyalkylether (PFPE), Zdol, on amorphous carbon surfaces was studied as a function of hydrogen or nitrogen content in the carbon film, using scanning micro-ellipsometry. A layered structure of the thickness profiles was observed, which remained qualitatively the same for all carbon types. The sharpness of the second layer was gradually eroded as either hydrogen or nitrogen content in the films was increased. The thickness-dependent diffusion coefficient was calculated using the Matano interface method. It was observed that the surface mobility of Zdol increased as hydrogen content increased, but decreased as nitrogen content increased. Implications of these results on the boundary lubrication properties of Zdol on carbon films are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019143103204
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