Int J Thermophys 2005,26(3):647–664.CrossRef 35. Zhu H, Li CJ, Wu DX, Zhang CY, Yin YS: Preparation, characterization, viscosity and thermal conductivity of CaCO3 aqueous nanofluids. Sci China Technol Sci 2010,53(2):360–368.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions The manuscript was written through the contributions of all authors MM, ES, STL, learn more SNK, MM, MNMZ, and

HSCM. All authors read and approved the final manuscript.”
“Background The synthesis of metal nanoparticles with high uniformity attracts considerable attentions due to their fantastic optical properties arising from localized surface plasmon resonance (LSPR) [1–3]. Such plasmonic nanoparticles, especially silver, are widely used in catalysis [4, 5], biological and chemical sensors [6–8], and surface-enhanced Raman spectroscopy [9–11]. It has been recognized that the optical spectral signatures of plasmonic nanoparticles are primarily dependent on their shapes [12–14]. Leading works AZD9668 in the synthesis of silver nanoparticles have focused on the shape control of silver nanocrystals via various routes. Wiley

et al. [15] controlled the shapes of silver nanocrystals by varying reaction conditions such as the precursor concentration, molar ratio of the surfactant, and silver ions. As well known, the final structure of the nanocrystals are mainly determined by the crystallinity of seeds produced in the early stage of the reaction. Xia’s group prepared silver pentagonal nanowires, nanocubes, and bipyramids from multiply twinned decahedral seeds, single-crystalline seeds, and single-twinned seeds, respectively [16]. As for the crystals’ control

of seeds, Xia et al. introduced Cl- or Br- as etchants combined with oxygen to avoid the formation of undesired seeds [17]. Another factor that influences the shape uniformity of the nanocrystals is self-nucleation in the reaction process. Self-nucleation of reductive silver atoms usually blocks the seed growth process resulting in the formation ADP ribosylation factor of spherical by-productions. The solution to the problem is to decrease the reduction rate of silver ions. Zhang et al. [18] applied a weak reductant to control the reduction rate. Meantime, citrate ligands used can also decrease the reduction rate because of complexation between silver ions and citrate ligands. Using polyol reduction method in the presence of polyvinyl pyrrolidone (PVP), Sun and co-workers successfully prepared silver nanowires [19–22]. Alternatively, the addition of as-prepared seeds [19] in the initial growth step has been suggested to induce the formation of nanowires preferentially. However, these reaction processes are usually complex or difficult to control.