Abstract

On the basis of liquid‐phase reduction mechanism, a novel synthesis method to prepare silver nanoparticles (AgNPs) is proposed, which uses piezoelectric‐actuated three‐phase flow pulsating mixing microfluidic chip. In order to study and explore the influence of different factors on the synthesis of AgNPs, a series of related synthesis experiments were carried out. The corresponding experimental conditions include the concentration of sodium hydroxide and reducing agent solution, polyvinylpyrrolidone (PVP) dosage, inlet flow rate, and synthesis temperature. The synthesized AgNPs were characterized by the UV‐Vis absorption spectrophotometer and transmission electron microscopy. The effects of different experimental conditions on the controllable synthesis of AgNPs were analyzed, and the optimum synthesis conditions of AgNPs were obtained. Experimental results show that the spherical AgNPs with an average particle diameter of about 29 nm, high yield, fine morphology, and good monodispersity were synthesized using the microfluidic chip under the conditions of the working frequency (200 Hz), the initial concentration of silver nitrate (1 mM), the synthesis temperature (80°C), the concentration ratio of sodium hydroxide to silver nitrate (2 : 1), the concentration ratio of glucose to silver nitrate (4 : 1), the inlet flow rate (3.5 ml/min), and the quality ratio of PVP to silver (more than 1 : 1). The related research shows that it is an efficient synthesis method to develop the controllable synthesis experiments of AgNPs under multifactors using the three‐phase pulsating mixing microfluidic chip.

Highlights

  • Silver nanoparticles (AgNPs), due to the volume effect, surface effect, quantum size effect, tunneling effect, and some new unique properties, are ideal candidates for biological [1], catalytic [2, 3], agricultural [4], chemical sensor [5], chemical probe [6], and medical [7, 8] applications

  • 100 nm no. 8 (b) Figure 4: UV-Vis absorption spectra (a) and transmission electron microscopy (TEM) images (b) of ve groups of AgNPs synthesized under di erent glucose concentrations

  • Based on the reduction of silver nitrate with glucose, the controllable synthesis experiments of AgNPs were carried out by using a three-phase ow pulsating mixing microuidic chip. rough investigating and exploring the inuence of di erent factors on the synthesis of AgNPs, the optimum synthesis conditions of AgNPs were obtained, and the following conclusions were drawn: (1) It is an e cient and feasible experimental method to develop controllable synthesis experiments of AgNPs under multifactors by using the three-phase pulsating mixing micro uidic chip. is method can be extended to many research elds, such as the controllable synthesis of other nanoparticles and the control of complex chemical reactions

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Summary

Introduction

Silver nanoparticles (AgNPs), due to the volume effect, surface effect, quantum size effect, tunneling effect, and some new unique properties, are ideal candidates for biological [1], catalytic [2, 3], agricultural [4], chemical sensor [5], chemical probe [6], and medical [7, 8] applications. Ey found that higher ow rates resulted in the appearance of larger AgNPs (as well as increased polydispersity), and higher silver nitrate concentrations will be increasing the likelihood of reactions occurring in silver nitrate-rich zones, which leads to an increased formation of larger nanoparticles and polydispersity He et al [20] synthesized AgNPs with di erent particle size and monodispersity by adjusting the reaction temperature and the ow rate of the precursor solution in the micro uidic device. Yang et al [22] synthesized AgNPs with uniform particle size by controlling the ow rate of the solution and chitosan concentrations in the micro uidic chip. AgNPs formed clusters at higher ow rates They found that EDTA as a complexant presented signi cant e ect on the morphology and particle size control of spherical AgNPs with good dispersion. Synthesis temperature on the particle size, morphology, homogeneity, monodispersity, and yield of AgNPs and determined the optimum synthesis conditions of AgNPs

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