X-ray Absorption Fine Structure Techniques

Li, Zhongrui; Dervishi, Enkeleda; Saini, Viney; Zheng, Liqiu; Yan, Wensheng; Wei, Shiqiang; Xu, Yang; Biris, Alexandru S.

doi:10.1080/02726350903328944

Cited by 14 publications

(25 citation statements)

References 64 publications

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“…A different but also important study [45] also demonstrated the nucleation and the growth mechanism of the CdSe NPs using in situ fluorescence detected extended X-ray absorption spectroscopy (EXAFS) [46] and ex situ UV-Vis absorption techniques. The data collected via these two techniques were taken under the same conditions.…”

Section: In Situ Characterization Techniquesmentioning

confidence: 99%

Theories of nanoparticle and nanostructure formation in liquid phase

Karatutlu

Barhoum

Sapelkin

2018

Emerging Applications of Nanoparticles and Architecture Nanostructures

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598 CHAPTER 20 Theories of nanoparticle and nanostructure formation in liquid phase and crystallization. In general, tiny NP "clusters" are gathered together to form NPs, and then the NPs are assembled to form nanostructures. In bottom-up approaches, cluster formation and nucleation are the first steps in NP formation, and they are the most crucial steps in controlling the crystal structure, size, shape, and surface characteristics of NPs [9]. Nucleation is the process whereby nuclei (seeds) act as templates for crystal growth. Nucleation may happen in the solution homogeneously or heterogeneously. Homogeneous nucleation occurs when nuclei form uniformly within the parent phase, whereas heterogeneous nucleation forms on a solid support (nucleating surface), such as container surfaces, impurities, grain boundaries, or dislocations [10]. In general, heterogeneous nucleation occurs much more easily than homogenous nucleation, since a stable nucleating surface is already present.The fundamental phenomena involved in crystallization from solutions via nucleation and growth is still a hot topic [11]. Recently, significant efforts have been directed to understanding the mechanism of NP formation in solutions [12][13][14]. In particular, attention has been directed to study the wide varieties of additives and their influences on prenucleation clusters, nucleation, crystallization, nanocrystal assembly, and thus morphologies.The importance of NPs and nanostructures in many fields of science and technology has spurred a high level of research activity and led to the formulation of well-established theories for nucleation and crystal growth. This chapter highlights the different theories, such as classical nucleation theory (CNT), La Mer's nucleation and growth mechanisms, the two-step nucleation and growth mechanism, and the prenucleation cluster (PNC) mechanism. Subsequently in situ experimental characterization for NP formation, including nucleation and growth processes, will be highlighted, and what occurs within the different processes outlined. ■ ■ FIGURE 20.9 (A) The processes of Au depositing on a Pt icosahedral nanocrystal is schematically demonstrated. (B) The nucleation and growth of Au on Pt nanocrystals are quantitatively analyzed. (Source: Reproduced with permission from Ref. [47]. 615 6 In situ characterization techniques ■ ■ FIGURE 20.10 Radius, concentration, and size distribution from the SAXS fitting results. (A) The results of the fit of the SAXS patterns are presented as a function of time. For the two different ligands, the concentration of particles (n/N A ), the center of the Gaussian distribution, and the σ parameter are designated. (B) SAXS patterns for the first instants of the reaction and the corresponding fits for an acid ligand are shown. (C) Corresponding size distribution is given for the SAXS patterns presented in (B). (Source: Reproduced with permission from Ref. [48].

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Section: In Situ Characterization Techniquesmentioning

confidence: 99%

Theories of nanoparticle and nanostructure formation in liquid phase

Karatutlu

Barhoum

Sapelkin

2018

Emerging Applications of Nanoparticles and Architecture Nanostructures

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“…The use of XAS in the study of metal-doped glasses has been particularly fruitful when applied to elements such as Fe, Ti and Ga within what is otherwise a significantly lower atomic number matrix [85][86][87]. Recent developments in data collection mean that time resolution in the picosecond range is now possible at third-generation synchrotron sources [88]. This allows the measurement of a wide range of dynamics, including many of interest in the field of biomaterials.…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%

Titanium-containing bioactive phosphate glasses

Kiani

Lakhkar

Salih

et al. 2012

Phil. Trans. R. Soc. A.

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The use of biomaterials has revolutionized the biomedical field and has received substantial attention in the last two decades. Among the various types of biomaterials, phosphate glasses have generated great interest on account of their remarkable bioactivity and favourable physical properties for various biomedical applications relating to both hard and soft tissue regeneration. This review paper focuses mainly on the development of titanium-containing phosphate-based glasses and presents an overview of the structural and physical properties. The effect of titanium incorporation on the glassy network is to introduce favourable properties. The biocompatibility of these glasses is described along with recent developments in processing methodologies, and the potential of Ti-containing phosphate-based glasses as a bone substitute material is explored.

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“…X-ray absorption spectroscopy (XAS) is one of the direct structural probes providing information on the local environment around a photoabsorber (Lee et al, 1981;Rehr & Albers, 2000;Aksenov et al, 2006;Yano & Yachandra, 2009;Li et al, 2010;Boscherini, 2013). XAS is an excellent tool for this purpose, because it can be applied equally successfully to both ordered and disordered materials.…”

Section: Introductionmentioning

confidence: 99%

EXAFS and XANES analysis of oxides at the nanoscale

Kuzmin

Chaboy

2014

IUCrJ

211

202

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Worldwide research activity at the nanoscale is triggering the appearance of new, and frequently surprising, materials properties in which the increasing importance of surface and interface effects plays a fundamental role. This opens further possibilities in the development of new multifunctional materials with tuned physical properties that do not arise together at the bulk scale. Unfortunately, the standard methods currently available for solving the atomic structure of bulk crystals fail for nanomaterials due to nanoscale effects (very small crystallite sizes, large surface-to-volume ratio, near-surface relaxation, local lattice distortions etc.). As a consequence, a critical reexamination of the available local-structure characterization methods is needed. This work discusses the real possibilities and limits of X-ray absorption spectroscopy (XAS) analysis at the nanoscale. To this end, the present state of the art for the interpretation of extended X-ray absorption fine structure (EXAFS) is described, including an advanced approach based on the use of classical molecular dynamics and its application to nickel oxide nanoparticles. The limits and possibilities of X-ray absorption near-edge spectroscopy (XANES) to determine several effects associated with the nanocrystalline nature of materials are discussed in connection with the development of ZnO-based dilute magnetic semiconductors (DMSs) and iron oxide nanoparticles.

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X-ray Absorption Fine Structure Techniques

Cited by 14 publications

References 64 publications

Theories of nanoparticle and nanostructure formation in liquid phase

Theories of nanoparticle and nanostructure formation in liquid phase

Titanium-containing bioactive phosphate glasses

EXAFS and XANES analysis of oxides at the nanoscale

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