Directed growth

Nonpowder Synthesis. Many ceramic composites (qv) under iavestigation utilize reinforcing ceramic whiskers or fibers to achieve toughening (19). Whiskers (17,19,20) are produced by vapor-synthesis techniques. SiC whiskers can be produced by the rice hull or vapor—soHd (VS) method whereby rice hulls are pyrolyzed to produce a mixture of carbon, C, and Si02, and whiskers are produced by directional growth by vapor... 

K. Kassner, C. Misbah. Spontaneous parity-breaking transition in directional growth of lamellar eutectic structures. Phys Rev A 44 6533, 1991. 

Define the relationship with your mentor. Tflfce responsibility for self-directed growth. You and your mentor should decide on the approach and means to reach your goals. This can include telephone calls and electronic communications, as well as meetings arranged when it is mutually convenient. 

Electric-field-directed growth of gold nanorods in aqueous surfactant solutions. Advanced Functional Materials, 14, 571-579 (d) Jana, N.R. (2005) Gram-scale synthesis of soluble, near-monodisperse gold nanorods and other anisotropic nanoparticles. Small,... 

Additional research with Lemna species has indicated that parameters other than direct growth measurements may be more sensitive In this bioassay. Table VII compares growth and chlorophyll content of L. minor as affected by catechln. Final frond number was inhibited by 1000 pM catechln and stimulated at lower concentrations of 50 and 100 pM. Chlorophyll content on a per-frond basis, however, was consistently Inhibited by catechln and was concentration dependent to 100 pM. 

Phototropism is defined as the directed growth or bending of fixed organisms in response to light. Phototaxis is light-induced locomotion of... 

Hubert DHW, Jung M, Frederick PM, Bomans PHH, Meuldijk J, German AL (2000) Vesicle-directed growth of silica. Adv Mater 12(17) 1286-1290... 

Yu, L., Banerjee, I.A. and Matsui, H. (2003) Direct growth of shape-controlled nanocrystals on nanotubes via biological recognition. Journal of the American Chemical Society, 125, 14837-14840. 

Figure 4. (Phenylene ethynylene)-based conjugated oligomers prepared in solution using a bi-direction growth approach with in situ deprotection and coupling.

When the surface is completely covered by an oxide film, dissolution becomes independent of the geometric factors such as surface curvature and orientation, which are responsible for the formation and directional growth of pores. Fundamentally, unlike silicon, which does not have an atomic structure identical in different directions, anodic silicon oxides are amorphous in nature and thus have intrinsically identical structure in all orientations. Also, on the oxide covered surface the rate determining step is no longer electrochemical but the chemical dissolution of the oxide.1... 

A single adsorbed ion is only bonded in one direction, whereas an ion in a kink is bonded in three directions. Growth is therefore likely to proceed through addition of growth units (molecules or ions) at kinks. 

S. Jin, Q. Li, and C. Lee, Direct growth of amorphous silicon oxide nanowires and crystalline silicon nanowires from silicon wafer, Phys. Status Solidi A—Appl. Res. 188, Rl—R2 (2001). 

P. Petroff, Direct Growth of Nanometer-Size Quantum Wire Superlattices... 

Due to the relative ease of carrying out the reaction and the versatility of the process, the hydrosilylation reaction has been used in a number of interesting extensions and applications. Here several of them are highlighted. In one report, Lop-inski and coworkers used the same concept of the radical-initiated hydrosilylation reaction on the Si(100)-2 x 1 surface to induce self-directed growth of molecular wires on the surface [141]. On the Si(100)-2 x 1 surface, the radical chain reaction propagates primarily along the direction of the dimer row, leading to lines of... 

Scheme 3.21 Surfactant-directed growth of gold nanorods.

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