Aqueous Suspensions of Fumed Silica and Adsorption of Proteins

Characterization of Fumed Alumina/Silica/Titania in the Gas Phase and in Aqueous Suspension

“…Clearly, any simple correlation function, such as Eqs. [5]- [10], does not cover all features of the deshielding of protons with different environments.…”

“…Equation [2] is valid at various levels of theory (HF SCF, MP-n, CC, DFT), with the only differences being in the definition of the zeroth-order and first-order density matrices D (0) and D (10) ; also, this equation holds for both field-independent and field-dependent (B) atomic orbital (AO) basis sets. In the GIAO method the last functions are defined as ͑r, B͒ ϭ exp͕͑Ϫi/ 2c͓͒B ϫ ͑R Ϫ R G ͔͒r͖ ͑r, 0͒, [3] where c is the velocity of light and (r, 0) denotes the usual field-independent basis function centered at R .…”

“…where Tr stands for the trace of a matrix, the superscripts represent the order of the perturbations with respect to the external magnetic field and the nuclear magnetic moment, D (0) and D (10) are the unperturbed and first-order perturbed density matrices, and H is the one-electron Hamiltonian integrals (16, 17a). Equation [2] is valid at various levels of theory (HF SCF, MP-n, CC, DFT), with the only differences being in the definition of the zeroth-order and first-order density matrices D (0) and D (10) ; also, this equation holds for both field-independent and field-dependent (B) atomic orbital (AO) basis sets.…”

“…The function f(C c ) was obtained on the basis of the measurements of the integral intensity for given amounts of water (C c ) adsorbed onto the oxide (powder) surfaces from the gas phase (6,10,11). The signals of surface hydroxyls and water molecules from ice were not detected due to features of the measurement technique and the short time (ϳ10 Ϫ6 s) of cross-relaxation of proton in solids.…”

Adsorption of egg albumin onto methylated yeast biomass

“…Thus the studies on the protein adsorption onto various surfaces in aqueous systems has been studied over the past few decades by many researchers (1)(2)(3)(4)(5). Recently, Peet et al (4) have proposed a new technology, centrifugal adsorption technology (CAT), for efficient adsorption from large liquid streams by using adsorbent particles in the micrometer range.…”