Hollow particles containing monocrystalline titanium oxide and silica, and having a titanium oxide content of 86.0-99.5 mol % and a silica content of 0.5-14.0 mol %; and a method of producing the particles. A white ink containing the hollow particles as a coloring agent; the use of the white ink in inkjet recording; and a method for inkjet recording using the white ink.

Hollow particles containing monocrystalline titanium oxide and silica, and having a titanium oxide content of 86.0-99.5 mol % and a silica content of 0.5-14.0 mol %; and a method of producing the particles. A white ink containing the hollow particles as a coloring agent; the use of the white ink in inkjet recording; and a method for inkjet recording using the white ink.

A precursor mixture for producing a porous body, wherein the precursor mixture comprises: (i) at least one milled alpha alumina powder having a particle size of 0.1 to 6 microns, (ii) non-silicate powder that functions as a binder of the alpha alumina powders, and (iii) at least one burnout material having a particle size of 1-10 microns and a decomposition temperature of less than 550° C., with the proviso that a burnout material having a decomposition temperature of 550° C. or greater is excluded from the precursor mixture.

A precursor mixture for producing a porous body, wherein the precursor mixture comprises: (i) at least one milled alpha alumina powder having a particle size of 0.1 to 6 microns, (ii) non-silicate powder that functions as a binder of the alpha alumina powders, and (iii) at least one burnout material having a particle size of 1-10 microns and a decomposition temperature of less than 550° C., with the proviso that a burnout material having a decomposition temperature of 550° C. or greater is excluded from the precursor mixture.

Certain examples of the present disclosure relate to a method for manufacturing a ceramic object, the method comprising: forming a ceramic structure by 3D printing the ceramic structure with a binder jetting 3D ceramic printer using a ceramic powder and an inorganic binder, wherein the ceramic powder comprises sintered ceramic material; and firing the ceramic structure to form the ceramic object.

A shell and a method for processing the shell are provided. The method includes: coating a sol prepared in advance on an inner surface of a ceramic shell prepared in advance; sintering the ceramic shell coated with the sol by using a sintering process, and forming a transition layer having nano-sized micro-pores on the inner surface of the ceramic shell.

Lost circulation materials may include pluralities of ceramic spheres having a size distribution in a range of from about 5 mm to about 25 mm and such that the lost circulation materials are porous and permeable. Methods of eliminating or reducing lost circulation from a well having a loss zone may include introducing the porous and permeable lost circulation materials into the well such that a porous and permeable flow barrier is created in the loss zone, wherein the porous and permeable flow barrier may prevent whole mud loss while drilling and allows hydrocarbon production after completion of the well. Carrier fluids may include water, viscosifiers, fluid loss additives, weighting agents, lost circulation materials containing pluralities of ceramic spheres having a size distribution in a range of from about 5 mm to about 25 mm.

Lost circulation materials may include pluralities of ceramic spheres having a size distribution in a range of from about 5 mm to about 25 mm and such that the lost circulation materials are porous and permeable. Methods of eliminating or reducing lost circulation from a well having a loss zone may include introducing the porous and permeable lost circulation materials into the well such that a porous and permeable flow barrier is created in the loss zone, wherein the porous and permeable flow barrier may prevent whole mud loss while drilling and allows hydrocarbon production after completion of the well. Carrier fluids may include water, viscosifiers, fluid loss additives, weighting agents, lost circulation materials containing pluralities of ceramic spheres having a size distribution in a range of from about 5 mm to about 25 mm.

A plugged honeycomb structure, including: a pillar-shaped honeycomb structure body including porous partition walls; and plugging portions disposed at open ends of cells at an inflow end face side or at an outflow end face side, wherein a pore diameter corresponding to the cumulative pore volume of 10% is D10, a pore diameter corresponding to the cumulative pore volume of 30% is D30, a pore diameter corresponding to the cumulative pore volume of 50% is D50, a pore diameter corresponding to the cumulative pore volume of 70% is D70, a pore diameter corresponding to the cumulative pore volume of 90% is D90, the pore diameter D10 is 6 μm or more, the pore diameter D90 is 58 μm or less, and the plugged honeycomb structure satisfies the relationship of Expression (1).
0.35≤(D70−D30)/D50≤1.5  Expression (1):

A plugged honeycomb structure, including: a pillar-shaped honeycomb structure body including porous partition walls; and plugging portions disposed at open ends of cells at an inflow end face side or at an outflow end face side, wherein a pore diameter corresponding to the cumulative pore volume of 10% is D10, a pore diameter corresponding to the cumulative pore volume of 30% is D30, a pore diameter corresponding to the cumulative pore volume of 50% is D50, a pore diameter corresponding to the cumulative pore volume of 70% is D70, a pore diameter corresponding to the cumulative pore volume of 90% is D90, the pore diameter D10 is 6 μm or more, the pore diameter D90 is 58 μm or less, and the plugged honeycomb structure satisfies the relationship of Expression (1).
0.35≤(D70−D30)/D50≤1.5  Expression (1):