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preparation-of-silver-iodide-nanoparticles-using-a-spinning-disk-reactor-in-a-continuous-mode.pdf

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The 1st International Seminar on Fundamental and Application ISFAChE 2010 of Chemical Engineering November 3-4, 2010, Bali-Indonesia

Preparation of Silver Iodide Nanoparticles Using a Spinning Disk Reactor in a Continuous Mode

Chin-Chan Li a, Yao Hsuan Wang a , and Clifford Y. Tai a *

a Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan

*Corresponding Author’s E-mail: cytai@ntu.edu.tw

Keywords: Precipitation; Spinning disk reactor; Silver iodide; Nanoparticle; Continuous mode;

Polyethylene glycol.

Abstract

The main theme of this research was to synthesize silver iodide nanoparticles using a spinning disk reactor (SDR), which is a type of high-gravity equipment. The centrifugal force was used to produce extremely thin film on the surface of a rotating disk. The waves and ripples generated on the disk surface enhanced the mixing intensity and mass-transfer rate and thus shortened the reaction time. The reactants were AgNO3 and KI, and the protecting agent tested was polyethylene glycol (PEG). The reaction was carried out in a spinning disk reactor by injecting two streams of AgNO3 and KI solution continuously. The reaction time was less than 1 min, which was considerably shorter than the conventional wet chemical process using a batch stirred vessel. The effects of various operating variables, including the concentration of AgNO3 and PEG, and rotation speed of disk, on the particle size and yield of silver iodide were investigated.

1. Introduction

The AgI nanoparticles have unique optical, eletrical and catalytic properties that make it useful in industial applications. The common methods for preparing AgI nanoparticles include revese microemulsion and reactive precipitation in a batch reactor. Each method has its own disadvantages. The microemulsion technique is inadequate to apply in industry due to low production rate and high cost. The reactive precipitation method is difficult to obtain uniform particles using batch stirred vessel because of the poor mixing efficiency. To overcome these problems, an efficient and cost- effective method, the high-gravity equipment, has been developed. The reactor with a rotating disk is called a spinning disk reactor (SDR), in which a centrifugal force has replaced gravity force to spread the incoming streams and produce an extremely thin film on the spinning disk surface. Inside the thin film, intense turbulence generated by the spinning disk enhances the mixing efficiency and the frequency of collision between reacting molecules, leading to a reduction in particle size and reaction time [Cafiero et al., 2002]. In our laboratory, several compounds have been synthesized using the high-gravity reactive precipitation in the SDR, such as BaCO3 [Tai et al., 2006], Mg(OH)2. [Tai et al., 2007], and Ag [Tai et al., 2008].

In this study, a reactive precipitation process proceeded in an SDR for producing AgI nanoparticles. The precipitation reaction was carried out in a spinning disk reactor (SDR) at ambient temperature in a continuous mode of operation. AgNO3 and a protecting agent, polyethylene glycol (PEG), were first dissolved in a aqueous solution. Then the solution was mixed with a KI aqueous solution in the SDR to precipitate AgI particles. The effects of the rotation speed, the concentration of

reactants (AgNO3 and KI), and protecting agent (PEG) on the size and yield of the AgI particles were investigated.

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