Ferric oxide sol

Hazel, E and Ayi es. G.H., Migration studies with ferric oxide sols, J. Phys. Chem., 35, 2930, 1931. 

A) Hydrous ferric oxide soL Here an acid-absorbing resin is used to take out the acid formed in hydrolysis of a ferric salt. De-Acidite or Amberlite IR-4 are both excellent for the purpose. They come in golden-brown granules of size about 10-20 mesh. Take about 50 ml of either material in a beaker, cover with dilute hydrochloric acid, and stir transfer to a vertical tube, 35 X 2 cm, drawn out at the bottom, with a short piece of rubber tube and screw clamp attached, as in Fig. 18. Put a plug of glass -J. W. Ryznar, Ind. Eng..Chem., 36 (1944), 821. 

A clear orange-red ferric oxide sol flows out of the bottom, in striking contrast to the almost colorless influent. 

What is the electrical charge on the particles of the ferric oxide sol ... 

Another sol—gel abrasive, produced by seeding with a-ferric oxide or its precursors, has been patented (30). A magnesium-modified version of this abrasive, also called Cubitron, is being produced as a replacement for the earlier type. Yttria [1314-36-91-vnc>A V eA sol—gel abrasives have also been patented (31), as well as rare earth oxide modified materials (32). These abrasives are all produced by 3M Corporation they have performed very well ia various applications such as ia coated abrasives for grinding stainless steel and exotic alloys. 

C. (1997) The behavior of ferric oxide hydro-sols in the presence of urea. Progr. Colloid Polym. Sci. 105 38-40... 

Matijevic, E. Scheiner, P. (1978) Ferric hydrous oxides sols. III. Preparation of uniform particles by hydrolysis of Fe(III)-chIoride, -nitrate, and -perchlorate solutions. J. Colloid Interface Sd. 63 509—524 Matijevic, E. (1980) Colloid chemical aspects of corrosion of metals. Pure Applied Chem. 52 1129-1193... 

Ferric Oxide or Red Iron Trioxide (Hematite), FejjOj, mw 159.70, ted or blk trigonal crysts, sp gr 5.12, mp 1560°(dec) insol in w, sol in HCl other acids found in nature as hematite and is a by-product in some industries. Can be prepd by dehydrating ferric hydroxide or calcining ferrous oxalate or sulfate. Used in magnetic tapes in electronics and as an ingredient of some expl compns Refs l) Lange (1961), No 824 2) Cond-... 

Insol in w, ale. or eth sol In acids occurs in nature as mineral magnetite. Can be prepd in pure state by dehydrating pptd hydrated ferric oxide, followed by reduction with hydrogen. 

Ferrous Oxide (Iron Monoxide), FeO mw 71.85, blk pdr, sp gt 5-7, mp 1420° insol in w, sol in acids. Can be prepd by heating ferrous oxalate under the hood, while avoiding inhalation of toxic CO evolved. Some ferric oxide is present as impurity. Used as ingredient of some expls... 

E. Ferric hydrous oxide sols. 2. Thermodynamics of aqueous hydroxo and sulfato ferric complexes. J. Phys. Chem. 81, 1061-1068 (1977). 

Hamada, S. and Matijevic, E. Ferric hydrous oxide sols. IV. Preparation of uniform cubic hematite particles by hyi-olysis of ferric chloride in alcohol-water solutions. J. Coll. Int, Sci. 84 274-277. 

It has been reported that ozone will not decompose ferrocyanides or ferricyanides 23). In this work it was found that ozone oxidizes ferrocyanides first to ferricyanides and then to ferric hydroxide sols. The first effect noted in the ozonation of ferrocyanides was rapid change of color (see Figure 8). As ozonation proceeded, the solution became turbid with the ferric hydroxide sol, some of which later settled on the bottom of the absorption bottle and was identified as Fe(OH)3. The ferricyanide was not completely consumed in any of the runs traces remained even after prolonged ozonation. As soon as the ozone was admitted to the bottle, the pH of the solution rose very quickly and ran off the recorder chart. Acid was added to drop the pH to 4.2 on three occasions to keep the pH under 11.0. The third addition of acid held the pH at 10.4, which then slowly dropped off to neutrality. Tests of such ozonated solutions with... 

Kuma, K., Nakabayashi, S., Suzuki, Y., and Matsunaga, K. (1992). Dissolution rate and solubihty of colloidal hydrous ferric oxide in seawater. Mar. Chem. 38, 133-143. Kuma, K., Nishioka, J., and Matsunaga, K. (1996). Controls on iron(III) hydroxide sol-... 

Matijevic, E. and Scheiner, P, Ferric hydrous oxide sols, J. Colloid Interf. Sci., 63, 509, 1978. 

Traditionally, diemiites are prepared by mixing fine conqwnent powders, such as ferric oxide and aluminum. Mixing fine metal powders by conventional means can be an extreme fire hazard sol-gel mediods reduce that hazard while achievii ultrafine particle dispersions that are not possible with normal processing methods. In conventional mixing, domains rich in either fiiel or oxidizer exist, vdiich limit die mass transport and dierefore decrease the efficiency of die bum. However, sol-gel derived nanoconqiosites should be more uniformly mixed, thus reducing die magnitude of this problem. 

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