Cabot Corporation

About: Cabot Corporation is a company organization based out in Boston, Massachusetts, United States. It is known for research contribution in the topics: Carbon black & Carbon. The organization has 1279 authors who have published 1399 publications receiving 36736 citations.

Particle having an attached stable free radical and methods of making the same

Abstract: A modified particle is disclosed wherein a particle has an attached group having the formula: ##STR1## wherein Ar represents an aromatic group; R1 represents a bond, an arylene group, an alkylene ##STR2## wherein R4 is an alkyl or alkylene group or an aryl or arylene group; R2 and R3, which can be the same or different, represent hydrogen, an alkyl group, an aryl group, --OR5, --NHR5, --NR5 R5, or --SR5, wherein R5, which is the same or different, represents an alkyl group or an aryl group; and SFR represents a stable free radical. Also disclosed is a modified particle or aggregate having attached a group having the formula: ##STR3## wherein CoupA represents a Si-containing group, a Ti-containing group, or a Zr-containing group; R8 and R9, which can be the same or different, represent hydrogen, an alkyl group, an aryl group, --OR10, --NHR10, --NR10 R10, or --SR10, wherein R10 represents an alkyl group or an aryl group; SFR represents a stable free radical; and n is an integer of from 1 to 3. A modified particle having an attached --SFR or --X--SFR is additionally disclosed. Also, modified particles with attached polymers are also disclosed as well as methods of making the modified products.

Rough nanoparticles at the oil–water interfaces: their structure, rheology and applications

Abstract: A two dimensional suspension is used as a model system to study structural and dynamical responses of weakly attractive particles. An attractive glassy monolayer is produced by spreading carbon black particles at the interface, with attractive interactions between the particles stemming from lateral capillary forces caused by the surface roughness and the subsequent contact line undulations. By controlling the surface concentration, strong and elastic interfacial layers are formed which wrinkle reversibly upon compression. The rheological properties of the resulting monolayers can be described by the framework of the ‘soft glassy rheology’ model. For example, the effects of concentration for a given type of particle on the frequency dependence of the moduli can be scaled. Data for two types of particles with different surface roughness reveal the effect of the interaction strength on the elasticity. The monolayers are also observed to ‘age’ as a function of time, with the elasticity increasing over time. Based on the soft glassy rheology model, a master-curve can be obtained using a time–concentration superposition procedure, where the effect of interaction strength also can be scaled and evaluated indirectly.