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Nano-particle deposition system (NPDS): Low energy solvent-free dry spray process for direct patterning of metals and ceramics at room temperature

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Abstract

With increasing concerns of environmental issues in manufacturing process, energy efficient and waste free manufacturing processes have been widely studied. In the field of nano/micro manufacturing, many research results of direct writing processes such as ink jet printing, gravure printing, and rapid prototyping processes have been reported to remove waste-producing conventional lift-off process for patterning. In addition, the use of toxic solvents such as acetone, toluene, xylene and so on has been decreased. At the same time, energy efficiency becomes one of environmental issues in manufacturing process. In this research, Nano particle deposition system (NPDS), a dry spray deposition process for fabrication of meta and ceramic direct patterning at room temperature, was introduced according to the environmental aspects. In previous studies, NPDS has shown the feasibility of the depositions of metals such as Sn and Ni, and the depositions of ceramics such as Al2O3, and TiO2 by spraying powders under low vacuum condition. The advantages of NPDS are 1) solvent free dry deposition process, 2) relatively low energy consumption with room temperature and low vacuum process condition, and 3) direct patterning process. The energy consumption in NPDS was briefly compared with similar processes including aerosol deposition and cold spray. The direct patterning results with 200μm width line pattern using micro-nozzle were fabricated without any post-processes. These results confirmed NPDS can become a solvent-free energy efficient direct patterning process for metals and ceramics.

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Abbreviations

P :

pressure (Pa)

P atm :

atmospheric pressure (101.3kPa)

V :

volume (m3)

W :

work done by expansion or compression (J)

n :

adiabatic index (Air: 1.4)

Δ:

infinitesimal

ṁ:

mass flow rate (kg/s)

A*:

area of nozzle throat or nozzle exit (m2)

ρ 0,in :

total density of inlet gas (kg/m3)

ρ0,out :

total density of outlet gas (kg/m3)

P 0,in :

total pressure of inlet gas (Pa)

P 0,out :

total pressure of outlet gas (Pa)

\(\dot V_{in}\) :

volume flow rate of inlet gas (m3/s)

\(\dot V_{out}\) :

volume flow rate of outlet gas (m3/s)

R:

gas constant (8.3145 J/mol·K)

T 0,in :

total temperature of inlet gas (K)

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Correspondence to Sung-Hoon Ahn.

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Chun, DM., Choi, JO., Lee, C.S. et al. Nano-particle deposition system (NPDS): Low energy solvent-free dry spray process for direct patterning of metals and ceramics at room temperature. Int. J. Precis. Eng. Manuf. 13, 1107–1112 (2012). https://doi.org/10.1007/s12541-012-0145-9

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  • DOI: https://doi.org/10.1007/s12541-012-0145-9

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