Table 1 Physicochemical properties of minerals and bacteria: Zeta potential (ζ), surface potential (ψ), contact angle (CA), and the calculated electron-donor (γs-), -acceptor (γ+) and non-polar Lifshitz-van der Waals component of surface free energy (γsLW).

From: Hypertonic stress induced changes of Pseudomonas fluorescens adhesion towards soil minerals studied by AFM

 

ζ

ψ

θ

γsLW

γs+

γs−

(mV)

(mV)

(°)

(mJ m−2)

Goethite

24.2 ± 4.0

28.6

44 ± 8

43.9

1.3 × 10–2

37.3

Kaolinite

− 45.3 ± 1.8

− 53.5

24 ± 2

43.1

2.3 × 10–3

58.8

Montmorillonite

− 35.5 ± 2.1

− 41.9

18 ± 3

43.7

5.2 × 10–4

63.3

Quartz

− 36.7 ± 4.5

− 43.3

0 ± 0

44.4

1.5 × 10–2

66.1

P. fluorescens (unstressed)a

− 10.6 ± 2.4

− 12.5

67 ± 5

35.8

1.7 × 10–1

17.0

P. fluorescens (stressed)a

− 12.3 ± 1.4

− 14.5

93 ± 2

35.0

2.7 × 10–1

3.4

  1. Error margins indicate one standard deviation (zeta potential: n = 10; contact angle: n = 9).
  2. ζ: zeta potential, ψ: surface potential, θ: solid–water contact angle, γs: solid surface free energy. Meaning of superscripts: ‘LW’: Lifshitz–van der Waals, ‘+’: electron acceptor, ‘–’: electron donor component of surface free energy, respectively.
  3. aData from Karagulyan et al.33
Back to article page