Microemulsions: Colloidal aspects

Hierarchical fabrication of silica cocoon with hexagonally ordered channel constructed wall via an emulsion-assisted process

“…Organic-inorganic hybrid hollow silica nanospheres [5] and hollow mesoporous silica nanoworms [6] were synthesized using a chiral cationic low-molecular-weight amphiphile as template. The formation of O/W emulsion is reasonable because the P123 micelles with n-decane solubilized inside as swelling agent can transform to emulsion droplets while excess amount of n-decane is used in the synthesis of hexagonally ordered materials [23][24][25][26][27]. In the synthesis process in current work, the residual water-rich layer is initially turbid right after the removal of decane-rich layer at room temperature but becomes clear and stable while its temperature was increased to 40°C.…”

“…1. Then, we can know that these onion-like silica spheres, with some parallel mesoporous tubes along their edge, are related to initial patterns of the cocoon-like pouches containing the wall constructed by hexagonally ordered channels [22][23][24][25][26][27]. Under static condition without stirring, the aggregation of the onion-like silica spheres is absent or proceeds very slowly and thus the hexagonally ordered structure can not be built [22].…”

Proceedings of the U.S. Army Chemical Research, Development and Engineering Center Scientific Conference on Chemical Defense Research Held in Aberdeen Proving Ground, Maryland on 14-17 November 1989

“…Cetyltrimethylammonium chloride (CTAC) was pL-c' ased from Eastman Kodak Co. as a dry chemical and was obtained as a 29 % aqueous solution (Arquad [16][17][18][19][20][21][22][23][24][25][26][27][28][29] from Akzo Chemie America.. Borate buffer (0.03 M) was added to the aqueous CTAC solution before use. The cosurfactants, tetramo t hylammcnium chloride (TMACI), tetraethylammonium chloride (TEACI), tetra-ni -propylammonium chloride (TPrACI), tetra-n -butylammonium chloride (TBACI) and bromide (TBABr), tetra-n -pentyl ammonium bromide (TPABr), tetra-n -hexylammonium chloride (THACI) and bromide (THABr), tetra-n -octylammonium bromide (TOABr) and Adogen® 464 (Ad) were purchased from Eastman Kodak and Aldrich Chemical companies.…”

“…This can be understood by first recognizing that V(r) for any free neutral atom is positive everywhere, increasing to a maximum at the nucleusa4- 26 . This simply reflects the highly concentrated nature of the nuclear charge as contrasted to the dispersed electronic distribution.…”

“…This phase has been called the middle or surfactant phase. 25 , 26 It has variously been suggested that this surfactant phase consists of bicontinuous structures, 33 lamellae of oil and water, 3 1 or molecularly dispersed solutions.…”