The tunable sensing behaviors of flexible conductive PDMS/NCG composites via regulation of filler size prepared by a facile sedimentation method

2021 ◽  
pp. 109037
Author(s):  
Siqi Li ◽  
Qian Liu ◽  
Zhijian Sun ◽  
Qingyan Liu ◽  
An Lv ◽  
...  
Keyword(s):  
Filler Size ◽  
Sedimentation Method

scholarly journals Evaluation of Cellulose Nanofi bers by Using Sedimentation Method

2019 ◽  
Vol 73 (5) ◽  
pp. 461-469 ◽  
Author(s):  
Akio Kumagai ◽  
Takashi Endo ◽  
Maki Adachi
Keyword(s):  
Sedimentation Method

scholarly journals Comparison of two coprological methods for the veterinary diagnosis of fasciolosis

2005 ◽  
Vol 57 (2) ◽  
pp. 181-185 ◽  
Author(s):  
F. Kleiman ◽  
S. Pietrokovsky ◽  
S. Gil ◽  
C. Wisnivesky-Colli
Keyword(s):  
Endemic Area ◽  
Diagnostic Method ◽  
Staining Method ◽  
Fasciola Hepatica ◽  
False Negative ◽  
Sample Processing ◽  
Hepatica Infection ◽  
Sedimentation Method ◽  
Faecal Samples ◽  
Reliable Diagnostic Method

The sensitivity and utility of a standard faecal sedimentation method (FSM) and a modified stool sieving staining method (FSSM), both currently employed for the diagnosis of Fasciola hepatica infection were compared. Faecal samples were obtained from 51 bovines of an endemic area for fasciolosis in Southwestern Argentina. Each sample was placed in a recipient containing 5% formalin. Eight millilitres of the suspension, equivalent to 2g of faeces, were used for each of the two methods tested. The number of eggs found per sample was recorded. The proportion of positive samples obtained by the FSSM (27/51) was significantly higher than that by the FSM (11/51) (P<0.05). The percent of agreement between methods was 41%. Over a total of 27 positive samples detected by the FSSM, the FSM missed 16, yielding 60% false negative samples. The FSSM enhanced 2.5 times the sensitivity of diagnosis. The complexity of the FSM may decrease its sensitivity through missing and loss of eggs during sample processing. These results confirmed that the commonly used FSM underestimates the prevalence and the egg output in cattle and that the FSSM is a more reliable diagnostic method.

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

2005 ◽  
Vol 492-493 ◽  
pp. 459-464 ◽  
Author(s):  
Shin-ichiro Tsuru ◽  
Noriyuki Hayashi ◽  
Tomohiko Onoda ◽  
Yasushi Sakamoto ◽  
Masanori Hara
Keyword(s):  
Reasonable Agreement ◽  
Simulation Method ◽  
Packing Fraction ◽  
Functionally Graded ◽  
Solid Particles ◽  
Number Density ◽  
Graded Materials ◽  
Filler Size ◽  
Centrifugal Process ◽  
Filler Distribution

A new numerical method to simulate the centrifugal process of fabricating functionally graded materials (FGMs) from solid-particles/viscous-matrix mixtures is proposed, and the simulation method was successfully applied to a practical fabrication process of FGM from an alumina-fillers/epoxy-resin mixture. Gradient profiles of dielectric constant of the resultant FGM were estimated by using the proposed method and compared with the experimental ones, resulting in reasonable agreement between them. Based on the numerical results, gradient pro- files of the number density and size of the dispersed fillers were confirmed, and contribution of the filler size toward the gradient in the packing fraction was demonstrated. It is concluded that the gradient in the filler distribution can be intentionally regulated by changing not only the centrifugal conditions, but also the size distribution of the fillers.

Atomistically Informed Continuum Model of Polymer-Based Nanocomposites

2002 ◽  
Vol 740 ◽  
Author(s):  
Catalin R. Picu ◽  
Alireza Sarvestani ◽  
Murat S. Ozmusul
Keyword(s):  
Discrete Models ◽  
Homogenization Theory ◽  
Total Density ◽  
Shape Variation ◽  
Filler Size ◽  
Chain Conformations ◽  
Energetic Interactions ◽  
Composite Moduli ◽  
Curved Interface ◽  
The Continuum

ABSTRACTA model polymeric material filled with spherical nanoparticles is considered in this work. Monte Carlo simulations are performed to determine the polymer chain conformations in the vicinity of the curved interface with the filler. Several discrete models of increasing complexity are considered: the athermal system with excluded volume interactions only, the system in which entropic and energetic interactions take place while the filler is a purely repulsive sphere, and the system in which both filler-polymer and polymer-polymer energetic interactions are accounted for. The total density, chain end density, chain segment preferential orientation and chain size and shape variation with the distance from the filler wall are determined. The structure is graded, with the thickness of the transition region being dependent on the property and scale considered. Hence, the polymer in the vicinity of the filler is represented in the continuum sense by a material with graded properties whose elasticity is determined based on the local structure. Homogenization theory is the used to obtain the overall composite moduli. The filler size effect on the composite elasticity is evaluated.

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