The Experts below are selected from a list of 4203 Experts worldwide ranked by ideXlab platform

Leander Tapfer - One of the best experts on this subject based on the ideXlab platform.

  • Structural and morphological investigation of Langmuir–Blodgett SWCNT/behenic acid multilayers
    Carbon, 2004
    Co-Authors: T. Di Luccio, F. Antolini, Patrizia Aversa, G. Scalia, Leander Tapfer
    Abstract:

    Abstract The goal of our work has been the incorporation of single wall carbon nanotubes (SWCNTs) in Langmuir–Blodgett organic multilayers. We deposited multilayers consisting of six cadmium behenate (CdBe) layers alternated with one layer of SWCNTs. SWCNTs and CdBe molecules were spread at the air/water interface and deposited at a fixed Compression Pressure for CdBe (27 mN/m) and two different Compression Pressures for the nanotubes, 15 and 45 mN/m, respectively. Low angle X-ray measurements exhibited distinct satellite peaks in all the samples demonstrating that the periodicity of the LB CdBe reference sample was conserved when SWCNTs were inserted in the structure. In agreement with the observations at optical and electronic microscopes, the samples deposited at the higher Compression Pressure (45 mN/m) presented more densely-packed and more uniform coverage of nanotubes.

  • Structural and morphological investigation of Langmuir-Blodgett SWCNT/behenic acid multilayers
    arXiv: Soft Condensed Matter, 2003
    Co-Authors: T. Di Luccio, F. Antolini, Patrizia Aversa, G. Scalia, Leander Tapfer
    Abstract:

    The goal of our work has been the incorporation of single wall carbon nanotubes (SWCNTs) in Langmuir-Blodgett organic multilayers. We deposited multilayers consisting of six cadmium behenate (CdBe) layers alternated with one layer of SWCNTs. SWCNTs and CdBe molecules were spread at the air/water interface and deposited at a fixed Compression Pressure for CdBe (27mN/m) and two different Compression Pressures for the nanotubes, 15 and 45mN/m, respectively. Low angle X-ray measurements exhibited distinct satellite peaks in all the samples demonstrating that the periodicity of the LB CdBe reference sample was conserved when SWCNTs were inserted in the structure. In agreement with the observations at optical and electronic microscopes, the samples deposited at the higher Compression Pressure (45mN/m) presented more densely-packed and more uniform coverage of nanotubes.

Kazumi Danjo - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Compression Pressure and die-wall Pressure on tablet sticking
    Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan, 2011
    Co-Authors: Kazuyuki Kakimi, Toshiyuki Niwa, Kazumi Danjo
    Abstract:

    : An eccentric-type tablet machine fitted with 8-mm-diameter flat-faced punches was used to measure the forces of upper and lower punches, die-wall Pressure, tablet ejection force, and scraper Pressure (SCR), a type of shear stress, to evaluate sticking behavior. The shear stress between the surfaces of the tablet and lower punch was determined using an SCR detection system. Mean surface roughness (R(a)) of tablets, measured by laser scanning microscopy, was used to estimate the magnitude of sticking. Tablet tensile strength tended to increase with Compression Pressure, which is consistent with previous reports. SCR decreased with increasing Compression Pressure for samples at all formulations (i.e., for different kinds and percentages of lubricant). R(a) associated with sticking increased with SCR, indicating that the adhesive force between the particles of the tablet surface and the lower punch surface plays an important role in sticking. Multiple linear regression analysis with SCR as the response variable was conducted. Upper and lower punch force, die-wall Pressure, tablet ejection force, SCR, percentage of lubricant, and tensile strength of tablet were selected as explanatory variables. Results of this analysis indicate that the incidence of sticking decreased when either the lower punch force or die-wall Pressure increased, where, of these two, increasing the lower punch force had a stronger effect on decreasing SCR.

  • Influence of Compression Pressure and velocity on tablet sticking.
    Chemical & Pharmaceutical Bulletin, 2010
    Co-Authors: Kazuyuki Kakimi, Toshiyuki Niwa, Kazumi Danjo
    Abstract:

    A rotary tablet machine fitted with 8-mm diameter flat-faced punches was used to measure scraper Pressure (SCR), a type of shear stress, to evaluate sticking behavior. The shear stress between the surfaces of the tablet and lower punch was determined using an SCR detection system. Mean surface roughness (Ra) of tablets, measured by a scanning laser-microscope, was used to estimate the magnitude of sticking. Tablet tensile strength tended to increase with Compression Pressure at either of the tablet production velocities tested, which was consistent with previous reports. SCR decreased with increasing Compression Pressure for samples at all Compression velocities, and showed a tendency to increase with binder concentration. SCR also tended to increase with Compression velocity for samples at all Compression Pressures, suggesting that the frequency of tablet sticking increased as Compression velocity increased. Ra associated with sticking increased with SCR, indicating that the adhesive force between the particles of the tablet surface and the lower punch surface plays an important role in sticking.

T. Di Luccio - One of the best experts on this subject based on the ideXlab platform.

  • Structural and morphological investigation of Langmuir–Blodgett SWCNT/behenic acid multilayers
    Carbon, 2004
    Co-Authors: T. Di Luccio, F. Antolini, Patrizia Aversa, G. Scalia, Leander Tapfer
    Abstract:

    Abstract The goal of our work has been the incorporation of single wall carbon nanotubes (SWCNTs) in Langmuir–Blodgett organic multilayers. We deposited multilayers consisting of six cadmium behenate (CdBe) layers alternated with one layer of SWCNTs. SWCNTs and CdBe molecules were spread at the air/water interface and deposited at a fixed Compression Pressure for CdBe (27 mN/m) and two different Compression Pressures for the nanotubes, 15 and 45 mN/m, respectively. Low angle X-ray measurements exhibited distinct satellite peaks in all the samples demonstrating that the periodicity of the LB CdBe reference sample was conserved when SWCNTs were inserted in the structure. In agreement with the observations at optical and electronic microscopes, the samples deposited at the higher Compression Pressure (45 mN/m) presented more densely-packed and more uniform coverage of nanotubes.

  • Structural and morphological investigation of Langmuir-Blodgett SWCNT/behenic acid multilayers
    arXiv: Soft Condensed Matter, 2003
    Co-Authors: T. Di Luccio, F. Antolini, Patrizia Aversa, G. Scalia, Leander Tapfer
    Abstract:

    The goal of our work has been the incorporation of single wall carbon nanotubes (SWCNTs) in Langmuir-Blodgett organic multilayers. We deposited multilayers consisting of six cadmium behenate (CdBe) layers alternated with one layer of SWCNTs. SWCNTs and CdBe molecules were spread at the air/water interface and deposited at a fixed Compression Pressure for CdBe (27mN/m) and two different Compression Pressures for the nanotubes, 15 and 45mN/m, respectively. Low angle X-ray measurements exhibited distinct satellite peaks in all the samples demonstrating that the periodicity of the LB CdBe reference sample was conserved when SWCNTs were inserted in the structure. In agreement with the observations at optical and electronic microscopes, the samples deposited at the higher Compression Pressure (45mN/m) presented more densely-packed and more uniform coverage of nanotubes.

Pratap Singh - One of the best experts on this subject based on the ideXlab platform.

  • Compression Characteristics of Water Hyacinth Plant
    Journal of Agricultural Engineering, 2020
    Co-Authors: Ghanshyam Tiwari, Ajay Kumar Sharma, Pratap Singh
    Abstract:

    Studies were carried out to observe the effect of Compression Pressure on Compression characteristics of water hyacinth (Elchhorma crassipes) plant. There was rapid reduction in volume and weight and bulk density of the compressed plant during initial and later stages of Compression process. Compression Pressure of 2.63 MPa was required to get maximum volume (94%) and weight (29.76%) reduction of water hyacinth.

  • Influence of System Parameters on Compressibility of Chopped Water Hyacinth (Eichhornia crassipes)
    Journal of Agricultural Engineering, 2003
    Co-Authors: S. Mathur, Pratap Singh, Asha Mehta
    Abstract:

    Chopped samples of fresh water hyacinth were compressed in a closed cylindrical die at 10 levels of Pressures, five levels of die charges and five levels of Compression speeds on Houn's Field Universal Testing Machine. The complete Compression process was observed and relationships were developed among Compression ratio and Compression Pressures, die charges and Compression speeds. The relationship between Compression ratio and Compression Pressure followed the simple power law while a linear trend was found with die-charge. The result shows that with the increase in die-charge the increase in Compression ratio decreases for all Compression Pressures. Compression ratio was found to increase with the increase in Compression Pressure for all die charge. There was a significant difference in reduction in Compression ratio while moving from one Pressure level to another and from one die charge to another die charge. Maximum Compression ratio found was 17.52 for die-charge of 0.020 kg and minimum was 4.95 for die charge of 0.040 kg, at a maximum Compression Pressure of 2.54 MPa.

Kazuyuki Kakimi - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Compression Pressure and die-wall Pressure on tablet sticking
    Yakugaku Zasshi-journal of The Pharmaceutical Society of Japan, 2011
    Co-Authors: Kazuyuki Kakimi, Toshiyuki Niwa, Kazumi Danjo
    Abstract:

    : An eccentric-type tablet machine fitted with 8-mm-diameter flat-faced punches was used to measure the forces of upper and lower punches, die-wall Pressure, tablet ejection force, and scraper Pressure (SCR), a type of shear stress, to evaluate sticking behavior. The shear stress between the surfaces of the tablet and lower punch was determined using an SCR detection system. Mean surface roughness (R(a)) of tablets, measured by laser scanning microscopy, was used to estimate the magnitude of sticking. Tablet tensile strength tended to increase with Compression Pressure, which is consistent with previous reports. SCR decreased with increasing Compression Pressure for samples at all formulations (i.e., for different kinds and percentages of lubricant). R(a) associated with sticking increased with SCR, indicating that the adhesive force between the particles of the tablet surface and the lower punch surface plays an important role in sticking. Multiple linear regression analysis with SCR as the response variable was conducted. Upper and lower punch force, die-wall Pressure, tablet ejection force, SCR, percentage of lubricant, and tensile strength of tablet were selected as explanatory variables. Results of this analysis indicate that the incidence of sticking decreased when either the lower punch force or die-wall Pressure increased, where, of these two, increasing the lower punch force had a stronger effect on decreasing SCR.

  • Influence of Compression Pressure and velocity on tablet sticking.
    Chemical & Pharmaceutical Bulletin, 2010
    Co-Authors: Kazuyuki Kakimi, Toshiyuki Niwa, Kazumi Danjo
    Abstract:

    A rotary tablet machine fitted with 8-mm diameter flat-faced punches was used to measure scraper Pressure (SCR), a type of shear stress, to evaluate sticking behavior. The shear stress between the surfaces of the tablet and lower punch was determined using an SCR detection system. Mean surface roughness (Ra) of tablets, measured by a scanning laser-microscope, was used to estimate the magnitude of sticking. Tablet tensile strength tended to increase with Compression Pressure at either of the tablet production velocities tested, which was consistent with previous reports. SCR decreased with increasing Compression Pressure for samples at all Compression velocities, and showed a tendency to increase with binder concentration. SCR also tended to increase with Compression velocity for samples at all Compression Pressures, suggesting that the frequency of tablet sticking increased as Compression velocity increased. Ra associated with sticking increased with SCR, indicating that the adhesive force between the particles of the tablet surface and the lower punch surface plays an important role in sticking.