Materials Research Express
·
2017
·Vol. 4
·期 4
·045006
·
IF 1.068
Hongtao Cui,Li Wang,Min Shi,Yanhong Li
In this work, lepidocrocite (γ-FeOOH) nanobundles were prepared by a facile NH4F assisted epoxide precipitation route. The reactions between epoxide and [Fe(H2O)6]2+ promoted the hydrolysis and condensation of [Fe(H2O)6]2+, resulting in the formation of iron oxyhydroxide. After calcination of γ-FeOOH nanobundles at 400 °C, the produced α-Fe2O3 still kept the bundle morphology. Due to the unique chemistry of epoxide, the morphology and phase of iron oxide polymorph nanoparticles (goethite, akaganeite, lepidocrocite, magnetite) were well-controlled through controlling reaction conditions such as Fe2+ concentration, NH4F additive and reaction temperature. It is particularly interesting that NH4F working as phase controlling agent is able to control the phase development of iron oxyhydroxides. This phase control effect of NH4F is attributed to the promoted reaction rate of epoxide originating from the higher electronegativity of fluoride ions than chloride ions. Based on the results in this work and our other preliminary works, it is considered that this route can be used as a general strategy for controlling the morphology and phase of transition element compounds.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiyang Cheng,Xia Meng,Yating Wang,Fangong Kong,Hui Jia,Jie Wang
Achieving accurate dosing of scale inhibitors in full reverse osmosis (RO) membrane systems for industrial applications is a critical challenge due to a lack of understanding of membrane fouling characteristics. To address this, this study investigated membrane performance at different inhibitor concentrations and proposed a method using ultrasonic phased arrays (UPA) to evaluate the fouling layer's spatial and density characteristics. The study also examined the relationship between fouling reversibility and compaction, and the results showed a clear conversion process from inhibition to exacerbation of membrane fouling by scale inhibitors. Additionally, the fouling layer distribution characteristics were opposite at different concentrations. At insufficient concentrations, the scaling layer forms near the outlet and spreads to the far-end with a continuously decreasing thickness. Conversely, at surplus concentrations, the opposite effect was observed. At sufficient concentrations, the fouling layer thickness and range exhibited a discontinuous distribution. The high-density layer was dominant on the membrane surface and showed low fouling reversibility. However, scale inhibitors were found to minimize fouling density by interfering with ion deposition, reducing the ion content and significantly increasing its reversibility. These findings have significant implications for scale inhibitor efficiency evaluation and scientific application, which can improve industrial membrane system performance.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Sihan Wang,Guishuai Wang,Zhanwei He,Xudong Mao,Mangmang Gao,Chou Kuo-Chih
With the increasing depletion of mineral resources and growing environmental pressures, the resource utilization of industrial solid waste has become crucial for sustainable development. Aiming at copper slag, a typical metallurgical solid waste, a phase-controlled oxidation modification method using CaO-MgO as modifier under high temperature was proposed in this study, which realized the efficient separation and recovery of iron and silicon resources. Through the systematic investigation of key parameters including oxidation temperature, basicity, and holding time, combined with characterization techniques such as XRF, XRD, SEM-EDS, and XPS, the phase transformation mechanism during the oxidation modification process was elucidated. The results showed that the basicity determined the presence form of iron and silicon, the temperature regulated the ion diffusion conditions, and the holding time affected the crystalline integrity of (Mg,Fe 2+ )Fe 2 O 4 . Under optimal conditions (oxidation temperature: 1300 °C, basicity: 2.0, holding time: 60 min), the iron element was effectively enriched to (Mg,Fe 2+ )Fe 2 O 4 and silicon element was converted to Ca 2 SiO 4 , forming distinct phase boundaries favorable for separation. After magnetic separation, the iron recovery rate was 85.83%, the total iron of the concentrate was 46.18%, and the content of Si, P, and S was reduced. The concentrate is suitable for direct recycling as ironmaking raw material in steel plants, and the Ca 2 SiO 4 -rich tailings can be utilized as construction materials to achieve synergistic "waste reduction-resource recovery" treatment of copper slag. This study provides new insights for high value utilization of metallurgical wastes, while offering practical solutions to alleviate resource pressures and environmental risks.
研究领域:
冶金工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 9
·期 1
·28
·
IF 3.504
Xianghong He,Yaheng Zhang,Yu Fu,Ning Lian,Zhongchun Li
There are only a few inorganic compounds that have evoked as much interest as sodium yttrium fluoride (NaYF4). Its extensive applications in various fields, including transparent displays, luminescence coding, data storage, as well as biological imaging, demand the precise tuning of the crystal phase. Controlling the emergence of the desired α-phase has so far remained a formidable challenge, especially via a simple procedure. Herein, we represented a polyol-assisted fluoride ions slow-release strategy for the rational control of pure cubic phase NaYF4mesocrystals. The combination of fluorine-containing ionic liquid as a fluoride source and the existence of a polyalcohol as the reactive medium ensure the formation of uniform α-phase mesocrystallines in spite of a higher temperature and/or higher doping level.Keywords:polyol-assisted fluoride ions slow-release strategy;NaYF4mesocrystals;crystallographic phase control
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Liang Wu,You-Yi Qin,Zi-Xiang Huang,Xu-Sheng Zheng,Yi Li,Rui Wu,Guo-Qiang Liu,Zhen-Chao Shao,Chong Zhang,Shu-Hong Yu
The precise control of the crystal phase during the synthesis of nickel selenide (NixSey) nanocrystals is crucial, as crystal structure and composition significantly influence their reactivity, growth kinetics, and properties. The cation exchange (CE) method provides a versatile and robust approach for synthesizing nanomaterials, enabling precise control over phase, composition, and morphology. However, the application of this method for phase-controlled synthesis of NixSey nanocrystals has received limited research attention. Here, we present a morphology-guided CE method for the synthesis of spinel Ni3Se4 nanoparticles (NPs) and rhombic Ni3Se2 nanorods (NRs), wherein berzelianite Cu2-xSe NPs and NRs are employed as sacrificial templates for CE with Ni2+. This phase-controlled behavior, which is guided by morphology and dependent on the stacking length of the close-packed facets, relies on the rearrangement of the Se2– sublattice accompanied by CE, providing a unique and precise approach to controlling phase during nanocrystal synthesis. Additionally, the obtained Ni3Se4 NPs and Ni3Se2 NRs exhibit structure-dependent catalytic activities in the oxygen evolution reaction.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 4
·4125-4131
·
IF 2.478
Zheng Han,Liu Ying
Cu 2 ZnSnS 4 (CZTS), with a direct bandgap of 1.5 eV, is a primary candidate material for solar energy conversion applied in both photovoltaics and photocatalysis due to its tremendous reserves and environmental friendly components. Though the utilization of CZTS with phases of kesterite and wurtzite are extensive, until now, the synthesis and growth procedure of both phases are not clearly understood. In this work, we succeed in synthesizing CZTS microspheres with controlled phase through a facile method—ultrasonic spray pyrolysis (USP). By choosing ammonium thioglycolate and l -cysteine as sulfur source, which were found to be the key factor in the phase formation process, CZTS microspheres can be prepared in kesterite phase and wurtzite phase, respectively. After exposing the prepared CZTS microspheres under the Xe lamp irradiation, we found an apparently phase-dependent photocatalytic hydrogen evolution, in which the performance of kesterite phase CZTS sample was almost 2 times as high as that of wurtzite CZTS sample.
研究领域:
材料科学
·
能源转换
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Science China-Chemistry
·
2021
·Vol. 65
·期 1
·87-95
·
IF 9.445
Zhang Juntao,Le Jiabo,Dong Yuanting,Bu Lingzheng,Zhang Ying,Cheng Jun,Li Leigang,Huang Xiaoqing
Ruthenium (Ru) is one of the most promising metals for its versatility in driving a wide range of catalytic reactions. However, owing to the intrinsic preference of hexagonal close-packed ( hcp ) phase for bulk Ru, currently, it is still challenging to construct Ru-based nanomaterials with face-centered-cubic ( fcc ) phase for optimizing their performance towards potential applications. Herein, we report a facile wet-chemical method to directly create unconventional fcc -structured Ru-copper hollow urchin-like nanospheres ( fcc -RuCu HUNSs) as a class of efficient pH-universal hydrogen evolution reaction (HER) electrocatalyst. Interestingly, this synthetic strategy can be expanded to prepare other fcc -Ru-based alloy nanomaterials. Significantly, the novel fcc -RuCu HUNSs exhibit superior HER performance with the overpotential of only 25, 34, 40, and 26 mV to reach the current density of 10 mA cm −2 in 0.5 M H 2 SO 4 , 0.05 M H 2 SO 4 , 0.1 M KOH, and 1 M KOH, respectively, much lower than those of hcp -RuCu HUNSs and commercial Pt/C. Density functional theory (DFT) calculations further indicate that their excellent pH-universal HER performance results from the optimized adsorption free energy of H and work functions. Our work highlights the importance of phase control to design high-efficiency nanocatalysts for relevant catalytic reactions in energy conversion.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiang Meng,Xiaolong Jing,Jiang Cheng,Hua Tang,Xihao Chen,Xianju Zhou,Lu Li
Phase control of nanomaterials, determined by thermodynamic or kinetic conditions, is essential to sulfides’ characteristics, offering opportunities for exploring advanced applications in the field of optoelectronics. However, the one-step, high-yield, and defect-free synthesis of phase-pure nanoscale sulfides remains challenging. In this work, the low-cost solvothermal process enabled precise regulation of the phase evolution process to synthesize the expected sulfide (three phases in the Cu–Fe–S system) nanocrystals in a phase-pure form at low temperatures. These nanocrystals exhibited broadband photoabsorption ranging from the visible to the near-infrared (NIR) region. Subsequently, a solution-processed uniform CuFeS2 nanocrystal film was deposited on CdS by the same one-step route to create the first CuFeS2-based self-powered NIR photodetector. These devices demonstrated a superior stable and reproducible detection performance without bias voltage under NIR illumination, even up to 1050 nm, resulting from their suitable size. The rapid rise and decay times of ∼38 and ∼49 ms indicated that the devices are capable of high-frequency switching detection. Moreover, detailed chemical processes through accurately tuning the oxidation states, the influence of CuFeS2 nanoparticle size, phase control, and film thickness on performance were proposed in detail.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2017
·Vol. 12
·期 5
·285-288
·
IF 0.723
Hongtao Cui,Li Wang,Yanhong Li,Min Shi
Basic cadmium salts (CdOHCl and Cd(OH)NO 3 ·H 2 O) were used as phase-directing agents to guide the phase development of various metal hydroxychlorides including Cu 2 (OH) 3 Cl, Co 2 (OH) 3 Cl, Zn 5 (OH) 8 Cl 2 (H 2 O), Sn 3 O(OH) 2 Cl 3 and PbOHCl. The simple synthesis procedure includes only one step: solid basic cadmium salt was suspended in aqueous or ethanolic solution of metal salt for 6 h in ambient environment. The separated products from the solution had various morphologies such as sphere, bundle, sheet, hollow sphere and cube. The phase direction behaviour of basic cadmium salts can be attributed to their high reactivity, and most importantly to the structure similarity between basic cadmium salts and metal hydroxychlorides.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Ziheng Zhao,Xitao Li,Lingling Xie,Bingkun Chen,Ting Jiang,Jie Cao,Fa Zhang,Min Wang,Yafeng Wu,Hong Zheng,Fang Zhang,Yongtian Wang
Lead-free metal halide perovskites have attracted much attention owing to their non-toxicity and excellent optical properties . Especially, cesium copper iodide compounds exhibit advantages of good environmental stability and low cost, rendering promising potential applications in optoelectronic devices field. Here, we use an anti-solvent assisted crystallization method to realize phase control syntheses of CsCu 2 I 3 and Cs 3 Cu 2 I 5 by varying the concentrations of precursor solution. Using high precursor solution concentrations, Cs 3 Cu 2 I 5 with strong blue emission peak at 440 nm is prepared. While the CsCu 2 I 3 is fabricated at low precursor solution concentrations, with the yellow emission peak of 580 nm. Furthermore, the UV-pumped light-emitting diodes (UV-LEDs) are realized by adopting CsCu 2 I 3 and Cs 3 Cu 2 I 5 powders as phosphors, and we also obverse the scintillation characteristic of the cesium copper iodide powders, showing potential applications for lighting and X-ray detection devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 13
·4918
·
IF 4.6
Kaixuan Yang,Naimeng Chen,Xiaomiao Guo,Ruoqi Zhang,Xiaoyu Sheng,Hui Ge,Zhiguo Zhu,Hengquan Yang,Hongying Lü
The search for non-noble metal catalysts for chemical transformations is of paramount importance. In this study, an efficient non-noble metal catalyst for hydrogenation, hexagonal close-packed cobalt (HCP-Co), was synthesized through a simple one-step reduction of β-Co(OH)2nanosheets via a temperature-induced phase transition. The obtained HCP-Co exhibited several-times-higher catalytic efficiency than its face-centered cubic cobalt (FCC-Co) counterpart in the hydrogenation of the C=C/C=O group, especially for the 5-hydroxymethylfurfural (HMF) hydrogenation (8.5-fold enhancement). Density functional theory calculations demonstrated that HMF molecules were adsorbed more firmly on the (112_0) facet of HCP-Co than that on the (111) facet of FCC-Co, favoring the activation of the C=O group in the HMF molecule. The stronger adsorption on the (112_0) facet of HCP-Co also led to lower activation energy than that on the (111) facet of FCC-Co, thereby resulting in high activity and selectivity. Moreover, HCP-Co exhibited outstanding catalytic stability during the hydrogenation of HMF. These results highlight the possibility of fabricating hydrogenation catalysts with satisfactory catalytic properties by precisely tuning their active crystal phase.Keywords:phase-controlled;temperature-induced phase transition;HCP-Co;FCC-Co;hydrogenation
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2020
·Vol. 27
·期 1
·351-360
·
IF 2.394
Wang Jia,Rui Jiayi,Yin Jingzhou,Zhou Guolang,Zhu Lili,Wang Hao,Zhao Pusu,Zhang Lili
Two-dimensional Mg-substituted cobalt hydroxides (Co x Mg y (OH) z ) with different crystal phases were synthesized via a facile reaction of magnesium (Mg) powder and cobalt aqueous solution. The phases of Co x Mg y (OH) z (amorphous phase and β phase) were controlled by adjusting the cobalt salt precursors. The obtained hybrid amorphous Co x Mg y (OH) z (a-Co x Mg y (OH) z ) showed excellent specific capacitance (662.2 F g −1 , 1 A g −1 ) than β phase Co x Mg y (OH) z (β-Co x Mg y (OH) z ) and pure Co(OH) 2 (p-Co(OH) 2 ). Additionally, the hybrid supercapacitor assembled with a-Co x Mg y (OH) z and the activated carbon showed high specific capacitance (77.8 F g −1 , 1 A g −1 ) and ultrahigh cycling stability with 99.7% retention of the first capacitance at 10 A g −1 after 5000 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）