Page 286 - Book Hosokawa Nanoparticle Technology Handbook

4.6 SELF-ASSEMBLY FUNDAMENTALS

Patterned SAM

HFDTS-SAM Methanol (10μm)
Silanol group Silica particle (1μm )
Patterning of
Magnification Magnification
spherical particle
collectives

Decalin (50 ml)
Figure 4.6.16
Preparation of spherical particle collective patters prepared by two-solution method.

few nanometers over the whole particle collective and By these particle assembling and patterning
a rainbow structure color is observed from it. processes, the particle collective patterning of any
shape can be created using a solution process that
(c) Preparation and pattering of spherical particle has low energy consumption and low environmental
collectives by two-liquid method load. However, in order to materialize photonic
devices, the manufacture of various kinds of struc-
Based on this process, the preparation of spherical tures with high accuracy is required to control the
particle collectives made of an arbitrary number of photonic band gap and to produce different types of
particles (Fig. 4.6.15) and its patterning (Fig. 4.6.16) functional integration. Further development in this
have been realized [21]. For the preparation of spher- field is expected.
ical particle collectives, particles-dispersed water is
dropped on a hydrophobic self-assembled monolayer
and soaked in hexane, which is barely soluble to
water. After the size control divides the droplets in the References
colloid solution by ultrasonic treatment, the particle
collectives are sphericalized due to the hexane/water The related papers of the author are found at the
solution. Internet site http://staff.aist.go.jp/masuda-y/index.html
By this method, particle collectives of any size
can be prepared by changing the particle concentra-
tion and droplet size. In the patterning, the [1] Y. Masuda: Metamorphosis, Murata Manufacturing
hydrophobic/ hydrophilic self-assembled monolayer Co., Ltd., Vol. 10, pp. 26–27 (2005).
is used as a template to arrange the collectives at the [2] Y. Masuda, K. Koumoto: Ceramics Data Book, Vol. 28,
same interval. pp. 47–49 (2000).
For these structures, it is possible to control the [3] Y. Masuda, N. Saito and K. Koumoto: Bull. Ceram.
shape from a sphere to a flat dome by changing the Soc. Jpn., 37, 615–620 (2002).
combination of self-assembled monolayers and solu- [4] Y. Masuda, K. Tachibana, M. Itoh and K. Koumoto:
tion as well as the density ratio of the two solutions Mater. Integration, 14, 37–44 (2001).
and controlling the contact angle of the colloid solu- [5] Y. Masuda, K. Tachibana, M. Itoh and K. Koumoto:
tion and the buoyant force exerted on it. Concerning Fabrication of Microstructure for Novel Property and
the process of preparing these particle collectives,
the possibility of producing multi-dimensional peri- their Application, TIC, Tokyo, Japan, (2003).
odical structures and controlling the photonic band [6] Y. Masuda, K. Koumoto: J. Soc. Inorg. Mater. Jpn., 7,
gap is being investigated by making second-stage 4–12 (2000).
periodical structures by the use of spherical particle [7] Y. Masuda: Mater. Sci. Technol., Kinzoku, 76(3),
collectives. 284–292 (32–40) (2006).

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