[Object] To provide a porous piezoelectric material molded body highly useful as a constituent material of a piezoelectric transducer suitable, in particular, for a probe of medical ultrasound diagnosis equipment. [Solution] A porous piezoelectric material molded body, in which 1000 or more spherical pores with an average pore diameter in the range of 2 to 70 μm are dispersedly formed per volume of 1 mm3, is characterized in that there is substantially no pore with a pore diameter larger than 50 μm, and 80% by volume or more of the total pores that constitute a spherical pore group have a pore diameter within ±20% of the average pore diameter.

Provided is a carbon foam and a membrane electrode assembly having linear portions and node portions joining the linear portions; and a carbon foam and a membrane electrode assembly having linear portions and node portions joining the linear portions, where the carbon content is 51 mass % or more, and the mean deviation of coefficient of friction by the Kawabata evaluation system method is 0.006 or less.

A process for the preparation of a porous carbon material using an improved amphiphilic species. Also disclosed are a porous carbon material, devices comprising the porous carbon material and use of an amphiphilic compound for the preparation of a porous carbon material. The process for preparing a porous carbon material comprises the process steps: (a) providing a carbon source comprising a first carbon source compound; (b) providing an amphiphilic species comprising a first amphiphilic compound, the first amphiphilic compound comprising two or more adjacent ethylene oxide-based repeating units; (c) contacting the carbon source and the amphiphilic species to obtain a precursor; and (d) heating the precursor to obtain the porous carbon material.

A process for preparing a porous carbon material. The process comprises the process steps: providing a carbon source; providing an amphiphilic species; contacting the carbon source and the amphiphilic species to obtain a precursor; and heating the precursor to obtain the porous carbon material; wherein the carbon source comprises a carbon source compound, wherein the carbon source compound comprises an aromatic ring having one or more attached OH groups and an ester link.

A porous body for an electronic vaporization device includes: a first surface; a second surface opposite the first surface; and at least two unit layers sequentially arranged along a direction from the first surface to the second surface, one layer of the at least two unit layers including at least a liquid storage advantage layer or a liquid locking advantage layer, and each other unit layer of the at least two unit layers including a liquid storage advantage layer and a liquid locking advantage layer combined with the liquid storage advantage layer.

A vaporization core for an electronic vaporization device includes: a porous body; and a heating film arranged on a surface of the porous body. The porous body has at least one unit layer, the at least one unit layer having a liquid storage advantage layer and a liquid locking advantage layer combined with the liquid storage advantage layer. The heating film is combined with a surface of the liquid locking advantage layer and at least partially infiltrates in the liquid locking advantage layer.

A process for the preparation of a porous carbon material using an improved amphiphilic species. Also disclosed are a porous carbon material, devices comprising the porous carbon material and use of an amphiphilic compound for the preparation of a porous carbon material. The process for preparing a porous carbon material comprises the process steps: (a) providing a carbon source comprising a first carbon source compound; (b) providing an amphiphilic species comprising a first amphiphilic compound, the first amphiphilic compound comprising two or more adjacent ethylene oxide-based repeating units; (c) contacting the carbon source and the amphiphilic species to obtain a precursor; and (d) heating the precursor to obtain the porous carbon material.

A composition is provided. The composition consists essentially of (a) 1 to 30 wt. % of a hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; (b) 1 to 40 wt. % of a compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper; (c) 40 to 95 wt. % of a particulate filler selected from the group consisting of glass; mono-, oligo- and poly-phosphates of magnesium, calcium, barium and aluminum; calcium sulfate; barium sulfate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide; aluminum oxide; silicon dioxide; silicon carbide; aluminum nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of a constituent that differs from constituents (a) to (c).

One aspect of the present disclosure provides a composite sheet including a porous sintered ceramic component having a thickness of less than 2 mm and a resin filled into pores of the sintered ceramic component, wherein the resin is a semi-cured product of a resin composition including a compound having a cyanate group and the content of triazine rings in the resin is 0.6 to 4.0 mass %.

A composite sheet includes porous a nitride sintered body having a thickness of less than 2 mm and resins filled in pores of the nitride sintered body, and has a main surface having a maximum height roughness Rz of less than 20 μm. A method for manufacturing the composite sheet includes an impregnating step of impregnating pores of a porous the nitride sintered body having a thickness of less than 2 mm with a resin composition, a smoothing step of smoothing the resin composition attached to a main surface of the nitride sintered body to obtain a resin-impregnated body in which a part of the main surface is exposed, and a curing step of heating the resin-impregnated body to cure or semi-cure the resin composition impregnated in the pores to obtain the composite sheet.