Centimeter Level Monolayer Close-packed of Disk-Shaped Diatomite Particles

doi:10.15541/jim20150152

Abstract

Abstract:

Diatomite earth, preferably maintained the morphology and structure of nature diatom, with the characteristic of unique multi-level nanopores and large specific surface area. Diatom is a low-cost at large quantity through repeatable separation from diatomite earth, suitable for industrial application. In this study, the disk-shaped diatom shell particles, size distribution between 40-80 μm, were extracted out by physical settlement method and mechanical screening method. Then, according to the particles self-assembly close-packed principles at air-water interface, the fast close-packed feasibility of hydrophobic diatom shells in a large area was studied. The results showed that by controlling the concentration and forms of diatom shell particles, centimeter level close-packed monolayer can be obtained. The close-packed monolayer area of floating diatom shell particles was over 23.7 cm², and on drying substrate was about 5.0 cm².

Key words: diatomite earth, sheet-shaped particles, self-assembled, monolayer close-packed

CLC Number:

TQ50

ZHANG Wen-Qiang, ZHANG Xin. Centimeter Level Monolayer Close-packed of Disk-Shaped Diatomite Particles[J]. Journal of Inorganic Materials, 2015, 30(11): 1208-1212.

Figures/Tables 5

Table 1 Solution formula for floating close-packed sheet-shaped diatomite

Methods	35 mm dish		55 mm dish
Methods	Volume of Diatom-ethanol/mL	Close-packed film effect	Volume of Diatom-ethanol/mL	Close-packed film effect
a	0.05	Not close-packed	0.05	Not close-packed
b	0.10	Partial close-packed	0.10	Not close-packed
c	0.15	Monolayer close-packed	0.20	Partial close-packed
d	0.20	Overlapping close-packed	0.40	Monolayer close-packed

Fig. 1 SEM images of sheet-shaped diatomite particles before and after being screened (a) Original diatomite; (b) Screening for 1 time; (c) Screening for 2 times; (d-f) Enlarged photo of diatomite A: Impurity substance; B-D: Discs of diatomite; E: Anulle

Table 2 Statistical results of sheet-shaped diatomite after being screened

Name	Distribution ratio of the diameter			Integrity proportion
Name	<40 μm	40-80 μm	>80 μm	Complete (>3/4 circle)	Fragment(3/4-1/4 circle)	Impurities
Screen 1 time	26%	66%	8%	59%	21%	20%
Screen 2 times	10%	71%	9%	68%	24%	8%

Fig. 2 Optical photographs of self-assembled monolayer formed by close-packed sheet-shaped diatom particles on water surface The order of a to d is consistent with that of the Table 1 methods. The diameter of dishes in left column is 35 mm, in right column 55 mm

Fig. 3 Monolayer self-assembled close-packed image of sheet- shaped diatom particles (a) Coverslip with the film of ϕ35 mm dish; (b) Coverslip with the film of 35 mm dish; (c) Silicon wafer with the film of Φ55mm dish; (d) Low magnification SEM image of close-packed particles on silicon wafer; (e) High magnification SEM image of close-packed particles on silicon wafer; (f) SEM image of coverslip with the film of 35 mm dish; (g) SEM image of coverslip with the film of 35 mm dish

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