Image formation method
An image formation method includes an ink ejection process of ejecting, from an inkjet head having a liquid-repellent film on an ejection surface thereof, an ink composition including: an oxidative-treated carbon black pigment having an average primary particle diameter of 25 nm or less and having an amount of oxygen of 5 atomic % or more on a surface thereof; a water-soluble nonionic compound including at least one selected from the group consisting of an ethyleneoxy chain and a propyleneoxy chain and in which a total number of the ethyleneoxy chain and the propyleneoxy chain is from 3 to 25; and water.
1. An image formation method comprising an ink ejection process of ejecting, from an inkjet head having a liquid-repellent film on an ejection surface thereof, an ink composition including: an oxidative-treated carbon black pigment having an average primary particle diameter of 25 nm or less and having an amount of oxygen of 5 atomic % or more on a surface thereof; a water-soluble nonionic compound including at least one selected from the group consisting of an ethyleneoxy chain and a propyleneoxy chain and in which a total number of the ethyleneoxy chain and the propyleneoxy chain is from 3 to 25; and water.
2. The image formation method according to claim 1 , wherein the ink composition further includes a polymerizable compound.
3. The image formation method according to claim 2 , wherein the inkjet head is provided with a nozzle plate at which a plurality of ejection holes are two-dimensionally arrayed and the liquid-repellent film is formed on an ejection surface of the nozzle plate.
4. The image formation method according to claim 2 , wherein the inkjet head is provided with a nozzle plate at which a plurality of ejection holes are two-dimensionally arrayed and the liquid-repellent film is formed on an ejection surface of the nozzle plate, and the liquid-repellent film contains at least a fluorocarbon compound.
5. The image formation method according to claim 2 , wherein the inkjet head is provided with a nozzle plate at which a plurality of ejection holes are two-dimensionally arrayed and the liquid-repellent film is formed on an ejection surface of the nozzle plate, the liquid-repellent film contains at least a fluorocarbon compound, and the fluorocarbon compound contains an oxygen atom.
6. The image formation method according to claim 1 , wherein the inkjet head is provided with a nozzle plate at which a plurality of ejection holes are two-dimensionally arrayed and the liquid-repellent film is formed on an ejection surface of the nozzle plate.
7. The image formation method according to claim 1 , wherein the liquid-repellent film contains at least a fluorocarbon compound.
8. The image formation method according to claim 7 , wherein the fluorocarbon compound contains an oxygen atom.
9. The image formation method according to claim 1 , further comprising a maintenance process of removing the ink composition, or an ink deposit derived from the ink composition, that is adhered to the liquid-repellent film, after the ejecting of the ink composition.