Structural Control of Mesoporous 1,4‐Phenylene‐silica Using the Mixture of CTAB/SDS

Abstract

The morphology, pore architecture and crystallinity of the mesoporous 1,4-phenylene-silicas were controlled using the mixtures of cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS). When the SDS/CTAB molar ratio increased from 0 to 1.0, the morphology of the mesoporous 1,4-phenylene-silicas changed in a sequence of sphere, hexagonal short rod, worm-like, bent flake and flower-like structure; the pore architecture of them changed from a hexagonal arranged tubular structure to a lamellar one; and the organization of the smallest repeat units within the wall changed from a random structure to a crystalline structure. At the SDS/CTAB molar ratios of 0.3 and 0.5, 1,4-phenylene-silica nanofibers with lamellar mesopores outside and tubular pore channels inside were obtained. The lamellar mesopores should be formed by merging the rod-like micelles during the reaction process.

A Novel Organometallic Coordination Polymer as a Heterogeneous Catalyst for C−C Bond Formation

“…Concerning a possible catalytic application, the nitroaldol (Henry) reaction is one of the most important atom‐economical and widely utilized method for the construction of carbon‐carbon bonds in organic synthesis [24–28] . This reaction is accomplished by coupling nitroalkanes with carbonyl (aldehyde or ketone) compounds to form β ‐nitro alcohols, which may lead to numerous valuable pharmaceutically important compounds by manipulating the nitro and hydroxyl groups [24] . Traditionally, such reaction is performed with organic or inorganic bases as homogeneous catalysts.…”

Synthesis of Poly(methacrylamide‐co‐methacrylic acid) Nanogels: Effect of Synthesis Parameters on the Nanosize, Characterization and Stimuli‐Sensitive Characteristics

“…Previously, it was explained that the use of surfactant can affect the crystallinity of the structure. [38] Zhuang et al [38] investigated the structural characteristics of 1,4phenylene-silica by using cetyltrimethylammonium bromide (CTAB) and SDS. [38] It was explained that when the molar ratio of SDS to CTAB increased, the structure can turn to a more crystalline character instead of random structure.…”

Pure hybrid nanofibers made of 4,4′-bis(triethoxysilyl)-1,1′-biphenyl and the way of their production

“…A commonly used term for hybrid organosilane nanofibers belongs to those types of nanofibers which are composed of various combinations of organic polymers [1]; combinations of the alkoxides containing organic polymers [2][3][4] and/or inorganic nanofibers dopped with various types of surfactants [5][6][7][8][9]. So-called "hybrid organosilane nanofibers" which are already described in the literature have been mainly prepared through self-assembly techniques in the presence of various additives [5][6][7][10][11][12] not the electrospinning technique.…”

“…So-called "hybrid organosilane nanofibers" which are already described in the literature have been mainly prepared through self-assembly techniques in the presence of various additives [5][6][7][10][11][12] not the electrospinning technique. These types of nanofibers have several disadvantages such as low mechanical resistance or decomposition with the change of the environment in which they have been formed [5,6,8,9,13,14]. They also need to be prepared with the presence of cationic surfactants [15][16][17] and/or various types of gelators [18,19].…”