TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: Evaporating is conducted by spraying. Washing is conducted by successively immersing the product in water, heating it to boiling, and keeping it at the boiling point for 5 minutes-2 hours. A surface treatment additive is mixed with the intermediate product and binder.Preferred Parameter: The crystallizing step is raised at 800-1200 degrees C or at 1000-1300 degrees C. The evaporation step is conducted at 100-400 degrees C.Preferred Dimension: The intermediate products comprise hollow spheres and parts of spheres. The diameter of the spheres is 1-100 microns. The sphere is 30-5000 nm thick.Preferred Property: The structure comprises needle-shaped particles that are strongly bound together. It has a thermal stability such that less than 5% dimensional change occurs upon holding the structure at 1100 degrees C in an oxidizing atmosphere for 8 hours.Preferred Component: Individual particles form the structure in which the particles have a size in a longitudinal direction from 0.1-50 microns. The particles have a width to length ratio of 1:1-1:20. The binder can be inorganic binder, and/or organic binder.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The metal salt is titanium (Ti), zirconium, hafnium, vanadium, tantalum, chromium, molybdenum, tungsten, manganese, aluminum, tin, antimony, lead, and/or bismuth. It is zirconium oxychloride, or preferably titanium oxychloride. The chemical control agent can be chloride salts, carbonate salts, fluoride salts, sulfate salts, silicate salts, borate salts, phosphoric acid, or phosphate salts of sodium, potassium, lithium, aluminum, tin, or zinc. EXAMPLE - A solution of titanium chloride containing Ti (40 g/l), chlorine (140 g/l), and sodium phosphate dodecahydrate (0.2 %), was subjected to total evaporation in a spray dryer. The solution was injected at 3 l/minute through an atomizing disk. Gases from the combustion of natural gas, diluted with air to 580 degrees C were also injected. The titanium dioxide (TiO2) product was collected. Polyvinyl alcohol (10 g) was dissolved in water (100 ml). The mixture was diluted to ethanol (200 ml), and combined with the TiO2 product. The resulting paste was dried at 90 degrees C, and pressed into discs of 3.4 cm diameter under 500 bar. The discs were heat-treated at 4 hours at 110 degrees C, at gradual temperature increase of 5 degrees C/minute up to 1150 degrees C, and 4 hours at 1150 degrees C. The product was allowed to cool. The discs were washed by immersing in water and brought to boiling for 1 hour. The resulting product showed a monolithic porous structure consisting of rutile crystals grown in place.