Journal of Materials Research最新文献_第6页

Hydroxyapatite modified with polyhedral oligomeric silsesquioxane as a filler for dental resin-based composites 用多面体低聚硅倍半氧烷改性的羟基磷灰石作为牙科树脂基复合材料的填料

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-09 DOI: 10.1557/s43578-024-01385-7

Zuzanna Buchwald, Tomasz Buchwald, Adam Voelkel

Hydroxyapatite modified with methacrylate groups-bearing polyhedral oligomeric silsesquioxane was for the first time applied as a filler in the experimental composite for dental applications. As the modifier changed the hydroxyapatite surface from hydrophilic to hydrophobic, it was predicted that the stability of the obtained composites would be improved in comparison with raw hydroxyapatite-filled composites. The stability in the oral imitating environment, basic physicochemical properties, and remineralizing potential understood as the ability to release calcium ions, were examined. The distribution of the fillers in the organic matrix, composites’ degree of conversion, depth of cure, flexural and compressive strengths, sorption, and solubility after 2 and 12 weeks of incubation, and the concentrations of calcium released were examined. The results were subjected to statistical analysis. The filler modification resulted in the improvement of the composites’ mass stability during long-term incubation with simultaneous beneficial more balanced calcium release profiles and comparable physicochemical properties.

Graphical abstract

羟基磷灰石经含甲基丙烯酸酯基团的多面体低聚硅倍半氧烷改性后，首次被用作牙科应用实验复合材料的填料。由于改性剂将羟基磷灰石的表面从亲水性变为疏水性，因此与未加工的羟基磷灰石填充复合材料相比，所获得复合材料的稳定性预计会有所提高。研究考察了其在口腔模拟环境中的稳定性、基本物理化学特性以及再矿化潜力（即释放钙离子的能力）。在培养 2 周和 12 周后，对填料在有机基质中的分布、复合材料的转化程度、固化深度、抗弯强度和抗压强度、吸附性和溶解度以及释放的钙浓度进行了研究。对结果进行了统计分析。填料改性提高了复合材料在长期培养过程中的质量稳定性，同时有利于更均衡的钙释放曲线和可比的理化特性。

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引用次数: 0

Analysis and simulation research on deep drawing of magnesium alloy box-shaped products with sand die based on different driving modes 基于不同驱动模式的砂模镁合金箱形产品拉深分析与仿真研究

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-09 DOI: 10.1557/s43578-024-01373-x

Xinyu Han, Hongyu Wang, Xinyu Wang, Jinyan Han, Sixiang Zhang

Deep drawing of box-shaped products is of wide interest. In this study, sand was used as a flexible medium to replace the rigid die for deep drawing of box-shaped products. This method can enable forming with reduced die cost. During the deep drawing, three driving modes were realized through different placement of the sand. To study the difference among these three driving modes, the macroscopic and microscopic cooperative verification method was adopted. At the macroscopic level, the pressure stress was analyzed by using analytical models and simulation. The stress variation rules were also obtained. At the microscopic level, the microstructure of the key regions is discussed. The results show that the maximum decrease in the average grain size was about 82.38%. The maximum proportion of deformed grains was about 4.30%. The rules governing the change in the microstructure and stress were obtained, enabling prediction of the stress distribution and the microstructure of other products obtained by using sand forming.

Graphical abstract

箱形产品的深拉伸受到广泛关注。在这项研究中，沙子作为一种柔性介质被用来替代刚性模具，用于盒形产品的拉深。这种方法可以在降低模具成本的同时实现成型。在拉深过程中，通过砂的不同放置实现了三种驱动模式。为了研究这三种驱动模式的差异，采用了宏观和微观协同验证的方法。在宏观层面，通过分析模型和模拟分析了压力应力。同时还得到了应力变化规律。在微观层面，讨论了关键区域的微观结构。结果表明，平均晶粒大小的最大降幅约为 82.38%。变形晶粒的最大比例约为 4.30%。研究获得了微观结构和应力变化的规律，从而可以预测使用砂型成型技术获得的其他产品的应力分布和微观结构。

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引用次数: 0

Facile fabrication of functional hyaluronic acid-/konjac glucomannan-based injectable hydrogel as wound closure and anti-microbial material for the treatment of burn wound healing 简易制备以透明质酸/魔芋葡甘露聚糖为基础的功能性可注射水凝胶，作为治疗烧伤创面愈合的伤口闭合和抗微生物材料

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-09 DOI: 10.1557/s43578-024-01383-9

Huiying Hao, Dan Li

Hydrogel dressings with self-healing properties hold immense promise for enhancing the effectiveness of burn wound healing treatments by prolonging the lifespan of the material. In this study, a composite hydrogel combining hyaluronic acid (HA) and konjac glucomannan (KGM), referred to as HAKGM hydrogel, was synthesized using the Schiff-base reaction. The research focused on investigating the impact of varying KGM concentrations on key properties such as gelation time, swelling ratio, biodegradation, mechanical characteristics, and physico-chemical properties of the HAKGM hydrogel composite. Notably, the HAKGM hydrogel composite exhibited notable antibacterial and biofilm activities against tested microorganisms, underscoring its potential for infection control in burn wound management. Furthermore, cytotoxicity assessments on NIH/3T3 cells revealed minimal harm caused by the HAKGM hydrogel composite, suggesting its biocompatibility. Fluorescence imaging showcased the attachment and infiltration of fibroblasts into the hydrogel matrix over 24, 48, and 72 h of cell growth, indicating its ability to support cellular proliferation and tissue regeneration. Finally, in a full-thickness skin defect model, the injectable HAKGM hydrogel composite demonstrated significant efficacy in reducing burn wound recovery time. These findings highlight the potential utility of the novel HAKGM hydrogel composite as an advanced solution for burn wound dressings, offering enhanced healing properties and facilitating improved patient outcomes.

Graphical abstract

具有自愈合特性的水凝胶敷料可延长材料的使用寿命，从而提高烧伤创面愈合治疗的效果，前景十分广阔。本研究利用席夫碱反应合成了一种结合透明质酸（HA）和魔芋葡甘露聚糖（KGM）的复合水凝胶，称为 HAKGM 水凝胶。研究重点是调查不同浓度的 KGM 对 HAKGM 水凝胶复合材料的凝胶时间、溶胀率、生物降解、机械特性和物理化学特性等关键特性的影响。值得注意的是，HAKGM 水凝胶复合材料对测试微生物具有显著的抗菌和抗生物膜活性，突出了其在烧伤伤口管理中控制感染的潜力。此外，对 NIH/3T3 细胞进行的细胞毒性评估显示，HAKGM 水凝胶复合材料对细胞的伤害极小，这表明它具有生物相容性。荧光成像显示，在细胞生长的 24、48 和 72 小时内，成纤维细胞附着并浸润到水凝胶基质中，这表明水凝胶具有支持细胞增殖和组织再生的能力。最后，在全厚皮肤缺损模型中，可注射的 HAKGM 水凝胶复合材料在缩短烧伤伤口恢复时间方面表现出显著功效。这些研究结果突显了新型 HAKGM 水凝胶复合材料作为烧伤创面敷料先进解决方案的潜在用途，它具有更强的愈合性能，有助于改善患者的预后。

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引用次数: 0

Efficient hydrogen production via hydrolysis of NaBH4 by the Co/Co3O4–Cu2O–ZnO catalyst prepared using mixed metal oxides as support material 以混合金属氧化物为支撑材料制备的 Co/Co3O4-Cu2O-ZnO 催化剂通过水解 NaBH4 高效制氢

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-09 DOI: 10.1557/s43578-024-01387-5

Neslihan Erat Toprak, Abdulkadir Özer, Gamze Bozkurt

In this study, we investigate for the first time the catalytic activity of the Co/Co₃O₄–Cu₂O–ZnO catalyst in hydrogen production from the hydrolysis of NaBH₄. After the Co₃O₄–CuO–ZnO support material was synthesized by the chemical precipitation method, the impregnation method was used to dope Co on the support material. Morphological and structural analyses of the Co/Co₃O₄–Cu₂O–ZnO catalyst were investigated by XRD, XPS, SEM, TEM, and BET methods. Then, activity tests of the catalyst were performed in an H₂ generation system. The hydrogen generation rate (HGR) of the Co/Co₃O₄–Cu₂O–ZnO catalyst was found 4698 ml min⁻¹ gcat⁻¹ at 25°C. After the HGR measurements at 25, 35, 45, and 55°C the activation energy of the Co/Co₃O₄–Cu₂O–ZnO catalyst was calculated as 28.05 kJ mol⁻¹. In addition, the HGR value had reached a high value such as 12,920 ml min⁻¹ gcat⁻¹ at 55°C.

Graphical abstract

本研究首次探讨了 Co/Co3O4-Cu2O-ZnO 催化剂在 NaBH4 水解制氢过程中的催化活性。采用化学沉淀法合成了 Co3O4-CuO-ZnO 支撑材料，然后采用浸渍法在支撑材料上掺杂 Co。通过 XRD、XPS、SEM、TEM 和 BET 方法研究了 Co/Co3O4-Cu2O-ZnO 催化剂的形态和结构。然后，在制氢系统中对催化剂进行了活性测试。在 25°C 时，Co/Co3O4-Cu2O-ZnO 催化剂的制氢率（HGR）为 4698 ml min-1 gcat-1。在 25、35、45 和 55°C 下测量 HGR 后，计算出 Co/Co3O4-Cu2O-ZnO 催化剂的活化能为 28.05 kJ mol-1。此外，在 55°C 时，HGR 值达到了很高的水平，如 12,920 ml min-1 gcat-1。

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引用次数: 0

Superior tensile properties of FDM 3D-printed TPU/E-TPU layered structure FDM 3D 打印热塑性聚氨酯/E-热塑性聚氨酯分层结构的卓越拉伸性能

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-03 DOI: 10.1557/s43578-024-01365-x

Muhammad Imran Farid, Wenzheng Wu, Guiwei Li, Aodu Zheng, Yu Zhao

The study examines 3D printing technology for robust and flexible prototypes, concentrating on FDM to improve the tensile properties of multilayer TPU and conductive TPU. This research aims at the mechanical properties of layered materials to evaluate how effectively rapid prototyping approaches adhere to robust and soft components. The research evaluated five TPU/E-TPU filaments that additively produced multilayer assemblies: Models (TET), (ETE), (TETE/ETET), (pure TPU), and (pure E-TPU). Models of pure TPU and pure E-TPU serve as standards for comparison. We tailored three input parameters at three levels each: layer thickness, printing speed, and extruder temperature. The experimental results of TET (emphasizing flexibility) and ETE (prioritizing electric conductivity)-layered model arrangements lead to the best mechanical properties. The ANOVA results for the tensile strength extension response models; R² = 75.7%; adjusted R² = 69.3%; and the tensile strain at yield is R² = 71.4%; adjusted R² = 65.7%.

Graphical abstract

该研究探讨了用于制造坚固和柔性原型的三维打印技术，重点是利用 FDM 改善多层热塑性聚氨酯和导电热塑性聚氨酯的拉伸性能。这项研究旨在研究分层材料的机械性能，以评估快速原型制作方法如何有效地粘附坚固和柔软的部件。研究评估了五种热塑性聚氨酯/导电热塑性聚氨酯长丝，这些长丝通过加成法生产多层组件：模型 (TET)、(ETE)、(TETE/EETET)、（纯 TPU）和（纯 E-TPU）。纯 TPU 和纯 E-TPU 模型作为比较标准。我们定制了三个输入参数，每个参数分为三个级别：层厚度、印刷速度和挤出机温度。实验结果表明，TET（强调柔韧性）和 ETE（优先考虑导电性）层状模型排列具有最佳的机械性能。拉伸强度扩展响应模型的方差分析结果为：R2 = 75.7%；调整后的 R2 = 69.3%；屈服点拉伸应变的方差分析结果为：R2 = 71.4%；调整后的 R2 = 65.7%。

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引用次数: 0

Understanding the mechanical properties of two-phase nanocrystalline AlCrFeMoNbNi high-entropy alloy evaluated by nanoindentation 通过纳米压痕评估了解两相纳米晶铝铬铁钼铌镍高熵合金的力学性能

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-02 DOI: 10.1557/s43578-024-01382-w

V. Madhu Babu, Deekshith G. Kalali, Harita Seekala, P. Sudharshan Phani, K. Bhanu Sankara Rao, Koteswararao V. Rajulapati

Nanocrystalline two-phase AlCrFeMoNbNi high-entropy alloy (HEA) was produced using mechanical alloying (MA) and high-pressure torsion (HPT), with an average grain size of 10 ± 2 nm. Nanoindentation testing was performed to measure the hardness from which the strengthening contributions via various mechanisms such as strain hardening, solid solution strengthening, frictional stress and grain boundary strengthening are assessed. A Hall–Petch coefficient of 0.135 MPa (sqrt{text{m}}) is estimated from this analysis, which is much lower than that for comparable alloys. A very low activation volume, for plastic deformation, of 3.4 b³ was measured from strain rate dependent nanoindentation testing, which is indicative of grain boundary mediated plastic deformation. Furthermore, the estimated activation energy of 171 kJ/mol measured from nanoindentation testing, is comparable to that for grain boundary diffusion in Cantor alloy. These experimental results provide insights on the deformation response of nanocrystalline two-phase AlCrFeMoNbNi HEA at an extremely fine grain size of around 10 nm.

Graphical abstract

利用机械合金化（MA）和高压扭转（HPT）技术生产了纳米晶两相铝铬铁钼铌镍高熵合金（HEA），其平均晶粒尺寸为 10 ± 2 nm。通过纳米压痕测试测量了硬度，并由此评估了应变硬化、固溶强化、摩擦应力和晶界强化等各种机制对强化的贡献。根据该分析估计，霍尔-佩奇系数为 0.135 MPa （sqrttext{m}}），远低于同类合金的霍尔-佩奇系数。应变速率依赖性纳米压痕测试测得的塑性变形活化体积非常低，为 3.4 b3，这表明了晶界介导的塑性变形。此外，纳米压痕测试测得的活化能为 171 kJ/mol，与康托合金中晶界扩散的活化能相当。这些实验结果为纳米晶两相 AlCrFeMoNbNi HEA 在约 10 纳米的极细晶粒尺寸下的变形响应提供了见解。

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引用次数: 0

Effect of boron microalloying on the microstructure, mechanical, and corrosion properties of as-cast biomedical Co–Cr–W–Ni-based alloys 硼微合金化对铸造生物医学 Co-Cr-W-Ni 基合金微观结构、机械性能和腐蚀性能的影响

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-02 DOI: 10.1557/s43578-024-01384-8

Muhammad Ilham Maulana, Adi Noer Syahid, Bunga Rani Elvira, Aprilia Erryani, Yudi Nugraha Thaha, Fendy Rokhmanto, Manami Mori, Kenta Yamanaka, Akhmad Ardian Korda, Ika Kartika, Albertus Deny Heri Setyawan

Co–Cr–W–Ni–Mn–B alloys, potentially applicable for implant materials, with boron contents of 0, 0.01, and 0.05 wt% were prepared by arc melting in an argon atmosphere. The influence of B content on the as-cast microstructure, mechanical, and corrosion properties was investigated. The as-cast state revealed dendritic structure, with the length of dendritic arm-spacing decreasing with increasing boron contents. The addition of boron led to the emergence of M₅B₃-type precipitates at the interdendritic boundaries within the matrix, which consisted of the γ and ε phases. The alloy with 0.01 wt% B exhibited increased ultimate-tensile-strength and plastic elongation of 17% and 36% higher than those of the boron-free alloy, respectively. The corrosion rate of the Co–Cr–W–Ni–Mn alloy in Hanks’ solution has dropped drastically by 850% with a minor B addition of 0.05 wt%. The improved mechanical and corrosion properties were attributed to the refined dendritic structure and formation of boride (M₅B₃-type) precipitates.

Graphical abstract

在氩气环境中通过电弧熔化制备了硼含量分别为 0、0.01 和 0.05 wt% 的 Co-Cr-W-Ni-Mn-B 合金，该合金可用于植入材料。研究了硼含量对铸态微观结构、机械性能和腐蚀性能的影响。铸造状态显示出树枝状结构，树枝状臂间距的长度随着硼含量的增加而减小。硼的加入导致基体内枝晶间边界出现 M5B3 型析出物，这些析出物由 γ 和 ε 相组成。硼含量为 0.01 wt% 的合金的极限拉伸强度和塑性伸长率分别比无硼合金高出 17% 和 36%。钴-铬-镍-锰合金在汉克斯溶液中的腐蚀率在少量添加 0.05 wt% 的硼后急剧下降了 850%。机械性能和腐蚀性能的改善归功于细化的树枝状结构和硼化物（M5B3 型）析出物的形成。

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引用次数: 0

Revisiting the structures and energies of β-SiC $$leftlangle {001} rightrangle$$ symmetric tilt grain boundaries 重新审视 β-SiC $$leftlangle {001} rightrangle$$ 对称倾斜晶界的结构和能量

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-02 DOI: 10.1557/s43578-024-01375-9

Liang Wang, Lei Zhang, Wenshan Yu

Structures and energetics of grain boundaries (GBs) can significantly modulate various properties of polycrystals. Previous studies focus on the ground-state GB structures of β-SiC while the metastable states are poorly understood. Herein, atomistic simulations are employed to generate metastable structures for a series of (leftlangle {001} rightrangle) symmetric tilt GBs in β-SiC. Structural units (SUs) based on the edge dislocation core structures are defined to characterize the GB structures. All GB structures can be divided into four types according to their different constituent SUs. Various distributions, orderings and combinations of SUs can generate multiple metastable structures with different GB energies. Furthermore, our calculations of low-angle GB energies agree well with the theoretical predictions based on the continuum elasticity theory. Our findings not only enhance the fundamental understanding of the (meta)stable grain boundary energetics and structural characteristics but also have significant implications for micro-structure design and grain boundary engineering in polycrystalline SiC.

Graphical abstract

晶界（GB）的结构和能量能显著调节多晶体的各种特性。以往的研究主要集中于β-SiC的基态晶界结构，而对其蜕变态却知之甚少。在此，我们采用原子模拟的方法生成了一系列β-SiC中的（左/角{001} 右/角）对称倾斜GB的可迁移结构。根据边缘位错核心结构定义了结构单元（SU），以表征国标结构。根据不同的组成 SU，所有 GB 结构可分为四种类型。SU的不同分布、排序和组合可产生具有不同GB能量的多种可迁移结构。此外，我们对低角度 GB 能量的计算与基于连续弹性理论的理论预测非常吻合。我们的发现不仅加深了对（元）稳定晶界能量和结构特征的基本理解，而且对多晶 SiC 的微结构设计和晶界工程具有重要意义。

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引用次数: 0

A comparative investigation on the development of porous-structured Akermanite (Ca2MgSi2O7) via ball milling, sol–gel, and combination (hybrid) process for orthopedic applications 通过球磨、溶胶-凝胶和组合（混合）工艺开发骨科用多孔结构赤铁矿（Ca2MgSi2O7）的比较研究

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-07-02 DOI: 10.1557/s43578-024-01378-6

M. Girija, T. Sampath Kumar

Biomedical material advancements have resulted in an increasing demand for innovative and high-performance Akermanite (AKT-Ca₂MgSi₂O₇) ceramics developed for a diverse range of uses. This study conducts a comparative analysis and development of porous AKT structures, employing three distinct synthesis methods: ball milling, sol–gel, and a combining both processes. The objective is to evaluate the microstructural properties, porosity levels, mechanical strength, and bioactivity of the AKT. XRD study confirms the phase purity at 1300 °C, and FT-IR identified the respective functional groups present in the material composition. SEM analysis revealed the porous structure (~ 3–6 μm) of AKT samples, which had a uniform distribution. The results suggest that the combination process enhances the structural and functional properties of Akermanite. Biomineralization study reveals that hydroxyapatite formation was attained after 21 days. The achieved compressive strength is 193 ± 5 MPa. The outcome of the antibacterial activity against S. aureus and E. coli test strains suggests that viable material for orthopedic applications.

Graphical abstract

生物医学材料的发展导致对创新型高性能阿克曼石（AKT-Ca2MgSi2O7）陶瓷的需求不断增加，这种陶瓷可用于多种用途。本研究采用球磨、溶胶-凝胶和两种工艺相结合的三种不同合成方法，对多孔 AKT 结构进行了比较分析和开发。目的是评估 AKT 的微观结构特性、孔隙率水平、机械强度和生物活性。XRD 研究证实了 1300 °C 时的相纯度，傅立叶变换红外光谱则确定了材料成分中各自存在的官能团。扫描电子显微镜分析表明，AKT 样品具有多孔结构（约 3-6 μm），且分布均匀。结果表明，组合过程增强了赤铁矿的结构和功能特性。生物矿化研究表明，21 天后羟基磷灰石形成。抗压强度为 193 ± 5 兆帕。对金黄色葡萄球菌和大肠杆菌试验菌株的抗菌活性结果表明，这种材料可用于骨科应用。

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引用次数: 0

Lamellar structures in directionally solidified naphthalene suspensions 定向固化萘悬浮液中的层状结构

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-06-26 DOI: 10.1557/s43578-024-01381-x

Kristen L. Scotti, Peter W. Voorhees, David C. Dunand

To investigate naphthalene as a suspending fluid for freeze-casting applications, sterically stabilized suspensions of copper microparticles suspended in liquid naphthalene are directionally solidified in a Bridgman furnace. Colonies of nearly particle-free naphthalene lamellae, interspersed with particle-enriched interlamellar regions, are predominantly aligned in the direction of the imposed thermal gradient. As furnace translation velocities decrease from 80 to 6.5 μm s⁻¹, the thickness of naphthalene lamellae increases. For the lowest velocity, a transition to a lensing microstructure (with naphthalene bands aligned perpendicular to the solidification direction) is observed in central regions of samples. For all velocities, the naphthalene lamellae show (i) secondary dendritic arms on one of their sides and (ii) are thinnest within core regions relative to peripheral regions (closest to the crucible walls). Together, these observations suggest the presence of buoyancy-driven convection during solidification.

Graphical Abstract

为了研究萘作为悬浮液在冷冻铸造中的应用，悬浮在液态萘中的铜微颗粒的立体稳定悬浮液在布里奇曼炉中定向凝固。几乎不含颗粒的萘层状菌落与富含颗粒的层间区域相间，主要沿施加的热梯度方向排列。当熔炉平移速度从 80 μm s-1 降低到 6.5 μm s-1 时，萘薄片的厚度增加。在速度最低的情况下，在样品的中心区域观察到向透镜微观结构的过渡（萘带垂直于凝固方向排列）。在所有速度下，萘层状结构（i）在其一侧显示出二级树枝状臂，（ii）相对于外围区域（最靠近坩埚壁），核心区域的萘层状结构最薄。这些观察结果表明，在凝固过程中存在浮力驱动的对流。

引用次数: 0