Morphology spheres

Finally, block copolymers have been made in a two-step process. First a mixture of chloroprene and -xylenebis-Ai,Ar-diethyldithiocarbamate is photopolymerized to form a dithiocarbamate terminated polymer which is then photopolymerized with styrene to give the block copolymer. The block copolymer has the expected morphology, spheres of polystyrene domains in a polychloroprene matrix (46). 

In a more general way, the two major driving forces for the design of novel micellar systems are the control over morphology (spheres, vesicles, rods, tubules etc. with controlled size) and function (stimulus-responsive materials, biological functions). Both of these aspects are intimately related since a given morphology can induce a specific function. 

A flame reactor is an excellent means for preparing pure or mixed oxides in the form of nonporous particles. The absence of porosity allows an average homogeneous irradiation of the particles. The morphologies (spheres, polyhedra) and the particle sizes (usually with a narrow distribution) can be mastered by adjusting the temperature, the flow rates (H2 and 02), and the concentration(s) of the compound(s) employed to generate the oxide. In the particular case of Ti02, anatase samples whose rutile content is very low can be produced. Consequently, the effect of the surface area S on the photocatalytic activity can be determined, in principle. 

Figure 1 shows the now familiar sequence of equilibrium morphologies (spheres, rods, lamellae) as a function of copolymer composition also included is the newly proposed bicontinuous double-diamond morphology which exists in certain cases in a narrow composition range between the rod-like and lamellar morphologies. 

Fine powder less dian 1 pm Soft or no agglomeration Narrow particle size distribution Morphology sphere Chemical composition controllable Microstructure controllable Uniformity Free flowing... 

For these calculations the order parameter of the system was developed as a function of characteristic wave vectors, which correspond to the scattering vectors of reflections observable in a scattering experiment. These phase diagrams considered only the classical microphase morphologies (spheres, cylinders, lamellae), which are characterized by interfaces with a constant mean curvature H ... 

Form factors for scattering particles or molecules with a regular morphology (spheres, cylinders, hollow spheres, lamellae) are available in the literature... 

Step they reported different morphologies (spheres and fibrils) depending on volume fraction and film thickness. 

---