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the contact angle
The Lewis acid-Lewis base properties of various polymers have been determined by measuring the contributions γs+ and γS- to the solid surface free energy using the contact angle approach of van Oss, Chaudhury, and Good.
      
From the contact angle measurements, the dispersive and polar components of surface free energies were reduced to 15-20 and 1-3 mJ/m2, respectively, and the surfaces were shown to be both highly water- and oil-repellent.
      
Effect of evaporation on the contact angle of a sessile drop on solid substrates
      
The effect of evaporation on the contact angle of a sessile drop of water on glass and polycarbonate substrates has been investigated.
      
The contact angle, however, decreases as evaporation proceeds.
      
In the case of water-glass system, the contact angle decreases almost linearly with time.
      
On the other hand, in water-polycarbonate system, the contact angle shows a considerable departure from linearity.
      
The contact angle data obtained are analysed in a non-linear way to calculate the acid-base components of all the liquids and solids.
      
(1) All plasma-modified ETFE surfaces, regardless of the kind and mode of plasmas, showed increases in the contact angle with increasing aging time.
      
(2) The plasmamodified surfaces after the aging process never reverted back to the same level of the contact angle as for the unmodified (original ETFE) surfaces.
      
(3) The contact angle after the aging process was strongly dependent on to what plasma the ETFE surfaces were exposed in the modification.
      
(4) The aging temperature influenced the contact angle value after the aging process.
      
The contact angle measurements did not correlate completely with the adhesion properties and could not monitor the overtreatment, while the ATR-FT-IR technique indicated changes just for overtreated foils.
      
The Wilhelmy plate technique has been used in this study to measure adhesion tension (which is the product of interfacial tension and cosine of the contact angle) at the solid-liquid interface.
      
The contact angle on the treated face can be reliably deduced, provided that a consistent value for the contact angle on the untreated face has been obtained.
      
Young's equation describes the wetting phenomenon in terms of the contact angle between a liquid and a solid surface.
      
It is postulated that wetting which is related to the contact angle, and interfacial adhesion, which is related to the sliding angle, are interdependent phenomena and have to be considered simultaneously.
      
Consequently, an interfacial adhesion strength parameter can be defined depending on the mass of the drop, the contact angle and the sliding angle.
      
The contact angle and sliding angle measurements were supported by AFM micrographs.
      
The effects of bamboo species, layer (outer, middle and inner) and chemical treatment (hydrochloric acid, sodium hydroxide and distilled water) on the contact angle of bamboo surfaces were examined.
      
 

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