We propose a metal ion-imprinted microsphere as a new metal ion-selective adsorbent Imprinted microspheres were prepared by seeded emulsion polymerization of divinylbenzene, styrene, butyl acrylate, and methacrylic acid The imprinted structure was introduced on the carboxylated microsphere by surface-imprinting, in which the carboxyl groups were reorganized through complexation with metal ions on the surface and then fixed by crosslinking polymerization in their specific orientation The Cu(II), Ni(II), and Co(II)-imprinted microspheres were obtained as submicron particles with average diameters of 055—060 μm They were immediately used as a metal ion-selective adsorbent without any further treatment, such as grinding and sieving The adsorption behaviors of metal ions (Cu(II), Ni(II), and Co(II)) were examined, and the imprinted effects were verified on Cu(II)- and Ni(II)-imprinted microspheres The imprinted microspheres adsorbed the corresponding guest ion more effectively than did unimprinted ones

Metal Ion-Selective Adsorbent Prepared by Surface-Imprinting Polymerization.

This review describes our study on preparation of alumina films by a sol-gel process and their several applications that have been investigated since 1986. Alumina films were prepared from alkoxide or inorganic salt. Both as-prepared alumina films were transparent in ultraviolet, visible and near infrared regions. The alumina from inorganic salt (inorganic alumina) was structureless even after annealed at 300–700°C in air, while the alumina from alkoxide (alkoxide alumina) was in pseudo-boehmite at an annealing temperature lower than 400°C and was in γ- or δ-type at 400–700°C. Both alumina films became opaque after annealed at temperatures above 1000°C. The inorganic alumina film annealed at 800°C showed a gas permeability that was influenced by physico-chemical properties of penetrant and alumina. Composite films of alumina and poly(vinyl alcohol) (PVA) were hydrophilic but insoluble in water, and removal of PVA from the composite films by annealing at 600°C led to formation of transparent alumina films. Such properties enabled us to use a counter diffusion method for fabricating γ-Fe2O3-doped alumina films. Alumina films doped with organic dyes such as laser dyes, hole-burning dyes and non-linear optical dyes, which were fabricated by gelation of dye-added alumina sol, exhibited laser emission, hole-spectra and second- or third-harmonic generation properties, respectively. Hydrogenation of alkene was catalyzed by Ni nanoparticles doped alumina films that were prepared by gelation of Ni2+ solution-added alumina sol and annealing the Ni2+-doped alumina gel in hydrogen gas. Nonlinear optical properties were observed for alumina films doped with CdS, Au and Ag nanoparticles, which were fabricated by gelation of Cd2+, HAuCl4 and AgNO3 solution-added alumina sols and annealing the Cd2+-doped alumina gel in H2S gas and the Ag+- and Au3+-doped alumina gels in H2 gas. Rare earth metal ion-doped alumina films, which were prepared by gelation of rare earth metal ion solution-added alumina sol and annealed the ion-doped alumina gel, exhibited not only normal luminescence but also up-conversion emission, energy transfer type luminescence and long lasting luminescence.

Preparation of alumina films by the sol-gel method

https://www.jstage.jst.go.jp/article/analsci/14/2/14_2_409/_pdf

Chemiluminescence Property of the Luminol-Hydrogen Peroxide-Copper(II) System in the Presence of Surface-Carboxylated Microspheres

Nanoscopic particle-doped polymer membrane prepared by the counter diffusion method and its properties

A polymer microsphere having phenylboronic acid sites on its surface was prepared by emulsion polymerization of styrene, butyl acrylate, and m-acrylamidophenylboronic acid. In the process of the preparation, the microsphere was swollen in an alkaline aqueous suspension by adding methylethylketone so that phenylboronic acid sites in the resin would migrate out to the aqueous-organic interface in their ionized forms. The microsphere was confirmed to have dimensions of submicron and assume a neat spherical shape. It was able to be immediately used as saccharide-selective adsorbent without any further treatment, such as grinding and sieving. D-Glucose was bound onto the microsphere while 1-methyl-α-D-glucoside was not, due to their different molecular structures. The adsorption of D-glucose was performed by complex (ester) formation between phenylboronic acid moiety and cis-diol group of D-glucose.

/pdf/preparation-and-characterization-of-polymer-microspheres-f9gp7psjff.pdf

Preparation and Characterization of Polymer Microspheres Which Have Specific Binding Ability for Saccharide Molecules

Carboxylated microspheres were synthesized by seeded emulsion polymerization of methacrylic acid, n-butylacrylate and styrene. The features of the microspheres such as composition, average particle diameter and particle distribution were examined by elemental analysis, FT-IR spectrum, particle grading analysis and scanning electron micrography. The manner of adsorption onto these microspheres in water suspension was studied for the metals Cu(II), Zn(II), Co(II), Ni(II) and Mn(II). The adsorption equilibrium was attained in less than 1 h. The microspheres could adsorb Cu(II) and Zn(II) selectively from weakly acidic solution (pH 5.6). The selectivity for Cu(II) among the divalent metal ions was comparable to those reported with Cu(II)-templated polymer resins.

Adsorption of metal ions onto carboxylated microspheres synthesized by seeded emulsion polymerization.

ゲル膜を介して反応液を接触させる対向拡散法により多孔性ポリビニルアルコール (PVA) ゲル膜中にAg微粒子を分散させた. Ag微粒子分散膜はいずれも420nm近辺に単分散微粒子のプラズモンの吸収を示し, 粒子の凝集が進むにつれて長波長側に幅広い吸収を示した. Ag微粒子が凝集分散している膜でSERSの測定を試みたところ吸着種の強いバンドが観測された.

https://www.jstage.jst.go.jp/article/koron1974/50/5/50_5_451/_pdf

Kaiyu Yu

Papers

Adsorption of metal ions onto carboxylated microspheres synthesized by seeded emulsion polymerization.

Absorption spectra of poly(vinyl alcohol) films doped with Ag nano particles and surface-enhanced Raman scattering