Iron oxides colloidal

Consequently, when selecting and blending the various raw materials used in all-polymer/all-organic formulations, the questions of thermal and hydrolytic stability and ability to transport or otherwise control colloidal iron oxides (in addition to possible adverse effects such as copper corrosion) become increasingly important at higher boiler temperatures and pressures. 

Aslant M, Schultz EA, Sun T, Meade T, Dravid VP (2007) Synthesis of amine-stabilized aqueous colloidal iron oxide nanoparticles. Cryst Growth Design 7(3) 471 175... 

Waite, T. D., and F. M. M. Morel (1984), "Photoreductive Dissolution of Colloidal Iron Oxide Effect of Citrate," J. Colloid Interface Sci. 102, 121-137. 

Meisel, D. (1990) Effect of the potential on electron transfer to colloidal iron oxide. Langmuir 6 555-559... 

Waite, TD. Morel, E.M.M. (1984) Photoreduc-tive dissolution of colloidal iron oxide Effect of citrate. J. Colloid Interface Sci. 102 121-... 

Waite, T.D. Torikow, A. Smith, J.D. (1986) Photoassisted dissolution of colloidal iron oxides by thiol-containing compounds. 1. Dissolution of hematite (a-Pe203). J. Colloid Interface Sci. 112 412-420 Walcott, C. Gould, J.L. Kirschvink, J.L. (1979) Pigeons have magnetic remanence. Science 205 1027-1028... 

Zhang,Y Kallay, N. Matijevic, E. (1985) Interactions of metal hydrous oxides with chelating agents. VII. Hematite - oxalic and citric acid systems. Langmuir 1 201-206 Zhang, Z. Boxall, C. Kelsall, G.H. (1993) Photoelectrophoresis of colloidal iron oxides. I. Hematite (a-Fe203). Colloids Surfaces. A. Physics Chemical and Engineering Aspects. 73 145-163... 

Waite, T.D. and Morel, F.M.M., 1989a. Photoreductive dissolution of colloidal iron oxide effect of citrate. 3. Colloid Interface Sci., 102 121-137. 

Brine (NaCl) solution, removal of colloidal iron oxides Saturated NaCl solution... 

As expected, trace metal adsorption to biogenic Mn oxides is dependent on pH. Wilson et al. (2001) measured and modeled the pH dependence of Pb to biogenic Mn oxides and compared it to that of colloidal iron oxides. As seen in Figure 7.7, the adsorption of Pb to Mn oxide exceeds that of Fe oxide (on a per mole of Mn or Fe basis) at pH values below 8.5. The pH dependence of Pb adsorption to Fe was greater than that for Pb adsorption to biogenic Mn oxides and thus, adsorption to Fe oxides is expected to become relatively more important as pH increases. 

Wilson (1990) has provided some details of the microstructural evolution in this fiber. A fine-grained o-AljOj fiber is obtained by seeding the high temperature a-alumina with a very fine hydrous colloidal iron oxide. The fine iron oxide improves the nucleation rate of a-Al Oj, with the result that a high density, ultra-fine, homogeneous o-Al203 fiber is obtained. The rationale for seeding with iron oxide as follows. Basic salts of aluminiun decompose into transition aluminum oxide spinels such as above 400°C. These transition cubic spinels... 

Waite T. D. and Morel E. M. M. (1984) Photoreductive dissolution of colloidal iron oxides in natural waters. Environ. Sci. Technol. 18, 860- 868. 

Waite, T.D., A. Torikov, and J.D. Smith. 1986. Photoassisted dissolution of colloidal iron oxides by thiol-containing compounds. J. Colloid Interface Sci. 112 412-420. 

Plaza. R.C. et al.. Aging effects in the electrokinetics of colloidal iron oxides, J. Colloid Intetf. 245. 86. 2002. 

Zhang, Z., Boxall, C., and Kelsall, G.H., Photoelectrophoresis of colloidal iron oxides. I. Hematite (a-FcjOj), Colloids Surf. A, 73, 145, 1993. 

K. Barbeau, J.W. Moffett (20(X)). Laboratory and field studies of colloidal iron oxide dissolution as mediated by phagotrophy and photolysis. Limnol. Oceanogr., 45, 827-835. 

Doyle (64) reports that colloidal iron oxide sorbed onto the platinum electrode from the aqueous phase of the system whose Eh is being measured enhances the reversibility of the electrode to the Fe -Fe- couple. He notes that the reaction of Fe- in the aqueous phase with oxygen sorbed on the electrode may also result in the formation of colloidal iron oxide on the platinum electrode. 

Donors of appropriate redox potential to react with holes at the anatase surface include organic acids, carbohydrates, fats, CN, and halides 2 ). (The cyanide reaction has been studied for its utility in treatment of the waste streams from Hold mininK operations in the Canadian Northwest Territories.) More immediately releyant to natural water is the observation that an anatase slurry could effect the decoloration of a chlorinated bleach plant effluent. A sample of amber colour, pH = 1.8, and low residual chlorine was irradiated in the presence of 0.5% (wt) anatase with li((ht of 350 nm for periods up to 18 hr. The optical absorbance decreased by half in 1080 min. Small amounts of chloride and formaldehyde were detected ( ). This reaction may provide a precedent for observation of a relation between photobleachinK of humics in water and metal ions. If so, we are brouj ht to the question of the reactivity of colloidal iron oxides. 

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