Characterization of Crystal Microstructure Based on Small Angle X-ray Scattering (SAXS) Technique

Wang, Hongfan; Xu, Jinjiang; Sun, Shanhu; Liu, Yanru; Zhu, Chunhua; Li, Jie; Sun, Jie; Wang, Shumin; Zhang, Haobin

doi:10.3390/molecules25030443

Cited by 23 publications

(11 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the q-range for q > 0.7 nm −1 , the Porod's law (I(q) = C/q 4 ) is evidenced, revealing the sharp electron density variation within the microstructure. The Porod's law can be used to estimate the Porod's length ( = ~ ) of the CNFs, where Q is the scattering invariant = ( ) , and C the Porod's constant [94]. Then, the invariant Q can be estimated using the Equation (3), which is divided in three subintegrals (Q1, Q2, and Q3) corresponding to integration in different regions of the SAXS scattering curve (Figure 6a): (Q1) at the lowest (low-q Guinier region, q→0), (Q2) middle (intermediate-q Guinier region) with qmax around 0.7 nm −1 , and (Q3) final slope (Porod region) q-values, with the lowest q-angle SAXS trend of the regions (1) and (i2) mainly obtained by extrapolation.…”

Section: Synchrotron X-ray Scattering Saxs/waxs Analyses Of Printed Hydrogels Characterization Of the Cellulose Nanofibers Dispersion Andmentioning

confidence: 99%

“…In the q-range for q > 0.7 nm −1 , the Porod's law (I(q) = C/q 4 ) is evidenced, revealing the sharp electron density variation within the microstructure. The Porod's law can be used to estimate the Porod's length ( l p = V CNF S CNF ∼ Q ϕ CNF πC ) of the CNFs, where Q is the scattering invariant Q = ∞ 0 I(q)q 2 dq, and C the Porod's constant [94].…”

Section: Synchrotron X-ray Scattering Saxs/waxs Analyses Of Printed Hydrogels Characterization Of the Cellulose Nanofibers Dispersion Andmentioning

confidence: 99%

See 1 more Smart Citation

Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissues

et al. 2021

View full text Add to dashboard Cite

Soft tissues are commonly fiber-reinforced hydrogel composite structures, distinguishable from hard tissues by their low mineral and high water content. In this work, we proposed the development of 3D printed hydrogel constructs of the biopolymers chitosan (CHI) and cellulose nanofibers (CNFs), both without any chemical modification, which processing did not incorporate any chemical crosslinking. The unique mechanical properties of native cellulose nanofibers offer new strategies for the design of environmentally friendly high mechanical performance composites. In the here proposed 3D printed bioinspired CNF-filled CHI hydrogel biomaterials, the chitosan serves as a biocompatible matrix promoting cell growth with balanced hydrophilic properties, while the CNFs provide mechanical reinforcement to the CHI-based hydrogel. By means of extrusion-based printing (EBB), the design and development of 3D functional hydrogel scaffolds was achieved by using low concentrations of chitosan (2.0–3.0% (w/v)) and cellulose nanofibers (0.2–0.4% (w/v)). CHI/CNF printed hydrogels with good mechanical performance (Young’s modulus 3.0 MPa, stress at break 1.5 MPa, and strain at break 75%), anisotropic microstructure and suitable biological response, were achieved. The CHI/CNF composition and processing parameters were optimized in terms of 3D printability, resolution, and quality of the constructs (microstructure and mechanical properties), resulting in good cell viability. This work allows expanding the library of the so far used biopolymer compositions for 3D printing of mechanically performant hydrogel constructs, purely based in the natural polymers chitosan and cellulose, offering new perspectives in the engineering of mechanically demanding hydrogel tissues like intervertebral disc (IVD), cartilage, meniscus, among others.

show abstract

Section: Synchrotron X-ray Scattering Saxs/waxs Analyses Of Printed Hydrogels Characterization Of the Cellulose Nanofibers Dispersion Andmentioning

confidence: 99%

“…In the q-range for q > 0.7 nm −1 , the Porod's law (I(q) = C/q 4 ) is evidenced, revealing the sharp electron density variation within the microstructure. The Porod's law can be used to estimate the Porod's length ( l p = V CNF S CNF ∼ Q ϕ CNF πC ) of the CNFs, where Q is the scattering invariant Q = ∞ 0 I(q)q 2 dq, and C the Porod's constant [94].…”

Section: Synchrotron X-ray Scattering Saxs/waxs Analyses Of Printed Hydrogels Characterization Of the Cellulose Nanofibers Dispersion Andmentioning

confidence: 99%

Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissues

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In the current work, we infiltrated CL-20 crystal powder in a perfluoropolyether (GPL-107) matching solution [29] and investigated the evolution of the nano-scale defects of CL-20 under non-isothermal phase changing and high temperature treatment by using in situ WAXS and SAXS techniques. GPL-107 perfluoropolyether reagent was chosen as the matching solution because of its chemical inertness and similar electron density pair to CL-20 crystals, which enabled us to use SAXS to study the pore structure without the influence of the crystal surface.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Evolution of Nano-Scale Defects of CL-20 Crystals under Thermal Treatment by Wide/Small-Angle X-ray Scattering

Zhang

Wang

et al. 2022

Materials

Self Cite

View full text Add to dashboard Cite

Nano-scale crystal defects extremely affect the security and reliability of the explosive charges of weapons. In order to understand the evolution of nano-scale defects of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaaza-isowurtzitane (CL-20) explosive crystals under thermal treatments, the specific surface, volume fraction and size distribution of the nano-scale defects were studied by using Wide Angle X-ray Scattering (WAXS) and Small Angle X-ray Scattering (SAXS) during the temperature range from 30 °C to 200 °C. The results showed that the number and size of the pores in CL-20 powder did not change significantly during the heating process before phase transformation (30–160 °C). At 170 °C, CL-20 began to convert from ε- to γ- phase, and the specific surface and volume fraction of the nano-scale defects increased significantly. Further investigation of the pore size distribution showed that the number of pores with a small size (radius 9–21 nm) changed particularly significantly, resulting from the cracking of the CL-20 crystal powder during phase transition. At 200 °C, the phase transition was completed and γ-CL-20 was created, and the small-sized pores gradually grew into medium-sized (radius 21–52 nm) pores over time when the temperature was fixed at 200 °C.

show abstract

“…To study the effect of particle size on the characteristics of internal defect structure in micro/nano LLM-105, SAXS technology was used to test LLM-105 samples with different particle sizes. At the same time, in order to remove the interference between surface pores and particle gaps, the matching solution(PFPE) [31] which is close to the electron density of LLM-105 explosive is infiltrated into LLM-105 powder with different particle sizes, and then the structure and fractal characteristics of the internal pore are characterized. According to the results, we find that the unit mass pore volume of the internal pores increases with the decrease of particle size, and the surface fractal dimension decreases with the decrease of particle size.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Xing

Dong

Yao

et al. 2022

Propellants Explo Pyrotec

View full text Add to dashboard Cite

To study the effect of particle size on the internal pore structure of micro/nano energetic materials, three kinds of micro/nano explosives 2,6‐diamino‐3,5‐dinitropyrazine‐1‐oxide (LLM‐105) with different particle sizes were selected as the research objects. The internal pore structure information, including porosity, pore volume distribution and fractal characteristics of micro/nano LLM‐105 were characterized by contrast variation small‐angle X‐ray scattering (CV‐SAXS). The scattering results show that the power‐law index of three samples with different particle sizes is between 3 and 4 in the measured q range (the surface fractal dimension Ds of 200 nm LLM‐105 is 2.16, Ds of 500 nm LLM‐105 is 2.20, and Ds of 3 μm LLM‐105 is 2.76). With the decrease of particle size, the interface between the internal pores and matrix becomes smooth. The pore volume per unit mass of LLM‐105 increases with the decrease of the particle size. The increase of pore volume per unit mass when the particle size decreases from 3 μm to 500 nm is much larger than that when the particle size decreases from 500 nm to 200 nm. The number of 2.5 nm–40 nm internal pores in LLM‐105 increases with the decrease of particle size. Especially for the pores of 11 nm, the number of pores increases most obviously with the decrease of particle size.

show abstract

Characterization of Crystal Microstructure Based on Small Angle X-ray Scattering (SAXS) Technique

Cited by 23 publications

References 29 publications

Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissues

Development of Bioinspired Functional Chitosan/Cellulose Nanofiber 3D Hydrogel Constructs by 3D Printing for Application in the Engineering of Mechanically Demanding Tissues

Investigation on the Evolution of Nano-Scale Defects of CL-20 Crystals under Thermal Treatment by Wide/Small-Angle X-ray Scattering

Characterization of the Internal Pores of LLM‐105 with Different Particle Sizes Using Contrast Variation Small Angle X‐Ray Scattering

Contact Info

Product

Resources

About