Soft Matter
·
2021
·Vol. 17
·期 26
·6486-6494
·
IF 3.679
Jiawei Lu,Xiangyu Bu,Xinhua Zhang,Bing Liu
The shapes of colloidal particles are crucial to self-assembled superstructures. Understanding the relationship between the shapes of building blocks and the resulting crystal structures is an important fundamental question. Here, we demonstrate that, by using particles whose shape interpolates between a flat disc and a sphere, not only are self-assembled superstructures but also their orientations sensitively dependent on the particle shape. By changing the shape gradually from a flat disc to a spherical shape, a crystal sequence from orientationally ordered crystals to orientationally disordered crystals with frozen and more free rotations are found. The latter two phases are identified as a glassy crystal and a plastic crystal, respectively. By combining theoretical model calculations, the formed crystal structures and the occurring transitions are found to be dictated by the interplay between particle shape and particle–particle interaction as well as particle–wall interaction. In particular, for quasi-spherical shapes, when the strong attraction dominates, a glassy crystal forms, or otherwise a plastic crystal forms. These results demonstrate that the interplay between the particle shape and the interaction can be used to tune crystallization and further fabricate colloid-based new structured and dynamic materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2017
·
IF 4.055
Yitong Han,Min Liu,Keyan Li,Qiao Sun,Chunshan Song,Guoliang Zhang,Zongchao Zhang,Xinwen Guo
Controlled synthesis of metal–organic frameworks (MOFs) in nanometer scale is highly desired for the optimization of properties and the extending of applications. In this work, Cu2O was used as additive for the first time in the synthesis of zirconium-based MOF UiO-66. We found that the amount of Cu2O additive had an important impact on downsizing the crystal size of UiO-66. Cu2O additive plays a role of rate controller of crystal growth of UiO-66 crystals by their competitive coordination behavior with the linker H2BDC between the [Zr–O] clusters. This generates a depleted H2BDC concentration for the coordination with the [Zr–O] clusters for constructing the UiO-66 framework, which favors the production of small crystals. As a result, well-dispersed nanometer scale UiO-66 crystals with mean crystal size of 40 nm can be easily synthesized by the addition of Cu2O. The as-synthesized nanometer scale UiO-66 crystals have a pure crystal structure with high crystallinity and superior porosity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2024
·
IF 4.5
Minqian Luo,An Chen,Chengbin Huang,Minshan Guo,Ting Cai
Coamorphous and cocrystal drug delivery systems provide attractive crystal engineering strategies for improving the solubilities, dissolution rates, and oral bioavailabilities of poorly water-soluble drugs. Polymeric additives have often been used to inhibit the unwanted crystallization of amorphous drugs. However, the transformation of a coamorphous phase to a cocrystal phase in the presence of polymers has not been fully elucidated. Herein, we investigated the effects of low concentrations of the polymeric excipients poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) (PVP) on the growth of carbamazepine–celecoxib (CBZ-CEL) cocrystals from the corresponding coamorphous phase. PEO accelerated the growth rate of the cocrystals by increasing the molecular mobility of the coamorphous system, while PVP had the opposite effect. The coamorphous CBZ-CEL system exhibited two anomalously fast crystal growth modes: glass-to-crystal (GC) growth in the bulk and accelerated crystal growth at the free surface. These two fast growth modes both disappeared after doping with PEO (1–3% w/w) but were retained in the presence of PVP, indicating a potential correlation between the two fast crystal growth modes. We propose that the different effects of PEO and PVP on the crystal growth modes arose from weaker effects of the polymers on cocrystallization at the surface than in the bulk. This work provides a deep understanding of the mechanisms by which polymers influence the cocrystallization kinetics of a multicomponent amorphous phase and highlights the importance of polymer selection in stabilizing coamorphous systems or preparing cocrystals via solid-based methods.
研究领域:
药物化学
·
材料科学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hongbo Zhao,Renjun Pei,Pei-Xi Wang
The teeth of limpets, consisting of orderly aligned hard goethite (iron oxyhydroxide) nanocrystals and flexible chitin microfibers, are one of the hardest and stiffest biomaterials found in nature. However, the replication of their composition and ordered microstructures to artificial biomimetic materials remains a challenge. Here, we fabricated large-sized limpet tooth analogues with hierarchically ordered structures by applying long-range orientational control to the short-scale self-assembly of hybrid colloidal liquid crystals formed by chitin nanocrystals and goethite nanorods. The obtained composite laminates exhibited excellent bending resistance compared to biomaterials, cement, and ceramics. These results suggest that the mass production of structurally ordered materials with high strength and toughness may be achieved by using lyotropic liquid crystals.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhi Jiang,Hezhuang Liu,Jihua Zou,Yixuan Huang,Zhaoquan Xu,Caihong Li,Desheng Liu
With the rapid advances in metal halide perovskite optoelectronics, eliminating toxic lead from perovskites has been an urgent demand. However, state-of-the-art lead-free perovskite photodetectors are still challenged with issues of low photoresponse, poor stability, etc. Here, all-inorganic lead-free perovskite (Cs3Cu2I5) single crystals that possess good stability under air exposure are synthesized via a facile solid reaction method. Meanwhile, a higher photoluminescence quantum yield of 95.2% and a prolonged carrier lifetime of 1.127 μs are obtained by further optimizing the synthesis. Benefiting from the polyporous surface and hollow structure of Cu-7,7,8,8-tetracyanoquinodimethane (CuTCNQ) microtubes, more Cs3Cu2I5 nanocrystals can adhere on the innershell and outershell of CuTCNQ-15 microtubes. This unique structure contributes to the improved efficiency of utilizing incident light and promotes charge carrier generation and transportation. As a result, the hierarchical CuTCNQ/Cs3Cu2I5 (hollow microtube/nanocrystal) heterostructure phototransistor exhibits a high responsivity of 88.36 A W–1 and a large detectivity of 1.66 × 1012Jones. The proposed lead-free perovskites and mixed-dimensional heterojunctions are promising for sensitive light detection.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Longping Jiang,Wenqian Chen,Limin Zhou,Li Xu,Feiqiang He,Jerry Y.Y. Heng,Hamza Shehzad,Jinbo Ouyang
The study of crystal growth and regeneration mechanisms is of great significance for controlling the morphology of crystals. Through the investigation of the recovery and regrowth processes of crystals, we have revealed the regeneration mechanism of aceclofenac (ACF) crystals and the influence of hydroxypropyl methylcellulose (HPMC) on the regeneration of ACF crystals. Firstly, ACF crystal regeneration experiments were conducted in acetone (ACT) and methyl acetate (MA), and it was found that the broken crystals could be successfully regenerated and restored to their original morphology, the regenerated ACF crystals in MA exhibited a larger aspect ratio. Secondly, the crystals obtained from the two solvents were placed in different solvents for regrowth, and it was shown that solvent was a key factor influencing the aspect ratio of ACF crystals. Additionally, HPMC was used to regulate the crystal morphology , it was found that the best effect was achieved when the mass fraction of HPMC was 0.5%, resulting in a regenerated crystal with an aspect ratio of only 2.19. Molecular simulation results indicated that the interaction between the radial (1 1 0) crystal facet and the solvent was weaker than that with the axial (1 0 -1) crystal facet, leading to a higher radial growth rate and a larger aspect ratio of the crystal. However, after adding HPMC, the interaction between HPMC and the radial (1 1 -1) and (1 1 0) crystal facets became stronger. HPMC selectively adsorbed on these two crystal facets, ultimately resulting in crystals with a smaller aspect ratio. The research findings of this study will provide theoretical basis for solving the problem of difficult morphology control due to crystal fragmentation in the pharmaceutical industry production process.
研究领域:
药学
·
晶体工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 32
·12571-12581
·
IF 5.7
Kaiyi Zhang,Fang Wang,Lei Zheng,Junqing Wei,Yongxu Hu,Yangyang Xie,Hongling Guo,Fengpu Zhang,Xin Lin,Zewen Li,Tianling Ren,Zhitang Song,Kailiang Zhang
2D Bi2O2Se is an intriguing building block for next-generation optoelectronic devices owing to its ultrahigh electron mobility and ultrabroadband photodetection capability. However, fully exploiting its advantages in advanced optoelectronic applications remains greatly challenging owing to the lack of in-depth understanding of the morphological evolution of Bi2O2Se crystals and efficient methods for enhancing their photoresponse. Herein, we developed a novel “cage-confinement” technique to achieve dimensionality-tunable growth of Bi2O2Se crystals in a space-confined CVD system. It can effectively control the key parameter of determining the dimensionality of crystals, referred to as the elastic strain energy of nucleation (ΔGs), by tuning the active area size of Bi2O3 seeds at a suitable flow rate of carrier gas. Furthermore, based on an optimized van der Waals transfer technique of crystals and electrodes, a sheet-shaped phototransistor of Bi2O2Se has a high responsivity (R) of ∼74 000 A W−1 and detectivity (D*) of ∼4.0 × 1011 Jones. Meanwhile, a wire-shaped device demonstrates an impressive R value of 300 000 A W−1, D* value of 3.9 × 1012 Jones and photoconductance gain (Gph) of 1.2 × 105. These results surpass most reported Bi2O2Se-based detectors and pave the way for the applications of 2D layered semiconductors in advanced optoelectronic devices and technologies.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Ziqing Li,Pengfei Zhu,Jimin Ding,Nianjing Ji,Yang Chen,Zhenyan Wang,Xiulan Duan,Huaidong Jiang
Yb-doped inorganic crystals have attracted great attention in both basic and applied research, and the quest for suitable crystal hosts and understanding the corresponding crystal field environments are still worth studying in laser application. In this context, inclusion-free RbTiOPO4:Ta:Yb (RTP:Ta:Yb) single crystals with dimensions up to 3 × 30 × 15 mm3 were grown by top-seeded solution growth method under optimized growth conditions. The good crystalline quality of the as-grown RTP:Ta:Yb crystals were confirmed by X-ray diffraction rocking curve. The chemical compositions of the crystals were determined through electron probe microanalysis (EPMA). The results showed that the Ta distribution coefficient is 0.90–1.28, and the Yb distribution coefficient is 0.13–0.37. Double doping of Ta5+ ions can effectively increase the concentration of Yb3+ ions in the RTP crystal, and the concentration of Yb3+ ion in RTP crystal can reach 1.26 × 1020 atom/cm3. The influence of Ta and Yb dopants on the electronic structures of RTP crystals was studied using high-resolution X-ray photoelectron spectroscopy (XPS), and the chemical strengths of Ti–O and P–O bonds are related to the binding energy difference. RTP:Ta:Yb crystals exhibit excellent transparent performance in the wavelength range of 0.35–4.5 μm, and the transmittance is about 83%. Photoluminescence spectra show five emission peaks of Yb3+ in crystals, and the main emission peak is located at 972 nm. Two different coordination sites for Yb3+ were observed, and their energy levels were determined in the crystal field of the RTP:Ta structure. Furthermore, the crystal field strengths of Yb3+ in different host crystals associated with their distorted coordination environments were evaluated and discussed in detail. The results demonstrate that the RTP:Ta:Yb single crystal endowed with high crystal field strength and good luminescence property is suitable for laser application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 60
·37760-37766
·
IF 3.361
Xiaodong Yang,Jia Li,Jianhua Yao,Tianrui Ren,Bo Zhang
The precise control architectures of Cu2O crystals are very crucial, which have a significant influence on their various performances. Herein, Cu2O crystals with diverse architectures were achieved via finely adjusting the concentration of NaOH. The intriguing results showed that the addition of specific amounts of OH− to the solution was crucial to tailor the morphology and size of the resulting microcrystals. We observed the evolution of the shapes of the Cu2O microcrystals, which change from a rhombic dodecahedron to spherical, octahedral-like and then to hexapod upon the increase in the NaOH concentration. Adjusting the volume of NaOH added provides a means to vary the particle size. Furthermore, density functional theory (DFT) may reveal that OH− ions serve as an efficient coordination agent selectively adsorbing onto different crystal faces of Cu2O crystals modifying the crystal energies, inducing the structure anisotropy on crystal growth. This work reveals that an effective and facile strategy has been developed for morphology-control of Cu2O crystals.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 28
·4790-4796
·
IF 3.117
Kaixuan Zhao,Zhijie Yang,Huiying Wei,Jinxin Guo,Yanzhao Yang,Jingjing Wei
The prevalent synthesis of colloidal metal oxide nanocrystals relies on the synthesis of various precursors, such as organometallic compounds, which are usually sensitive to moisture or oxygen and generally expensive. Based on the economic efficiency, the costs of the starting materials and synthetic process should be addressed. Herein, a general simple synthetic procedure from inexpensive and nontoxic precursors is developed. Under optimized reaction conditions, MnO nanocrystals are synthesized with commercially purchased bulk manganese oxides as starting materials, such as MnO, MnO2, and Mn3O4. The size and morphologies of nanoparticles are modulated by tuning the types and dosage of coating agents. Moreover, this synthetic strategy is further extended to other nanoparticles including Fe3O4 nanocrystals and FeMnOx nanocrystals. Furthermore, Re doped MnO nanocrystals exhibiting fluorescence properties have been synthesized with this method, which endows the fluorescence properties to these oxide nanocrystals.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 28
·5313-5319
·
IF 3.849
Xiangxin Tian,Qian Wu,Peng Zhao,Youxuan Sun,Zeliang Gao,Xutang Tao
Large sized crystals of Na2TeW2O9 with dimensions up to 75 × 35 × 25 mm3 were successfully grown using an optimized top-seeded solution growth method. The as-grown Na2TeW2O9 single crystal exhibits well-developed faces with the major forms {200}, {002}, {202}, and {220}, which are in superior accordance with the ideal morphology predicted by the Bravais–Friedel and Donnay–Harker methods. A complete set of room temperature elastic, dielectric, and piezoelectric constants of Na2TeW2O9 single crystals was determined using resonance techniques and impedance analysis. Our results show that Na2TeW2O9 exhibits excellent piezoelectric properties (d15 = −23.93 pC N−1, d24 = −20.34 pC N−1), making the crystal a promising candidate for piezoelectric applications. The relationship between the piezoelectric properties and the crystal structure is also discussed.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 37
·5602-5608
·
IF 3.304
Conggang Li,Zeliang Gao,Xiangxin Tian,Qian Wu,Weiqun Lu,Youxuan Sun,Xutang Tao
Large sized crystals of CdTeMoO6 with dimensions up to 30 × 12 × 9 mm3 were successfully grown using the top-seeded solution growth technique with an optimized flux system. High resolution X-ray diffraction rocking curve measurements revealed that the full-width at half-maximum (FWHM) of the rocking curve was 36 arcsec from the (001) reflection, which indicated high crystal quality. A complete set of room temperature elastic, dielectric, and piezoelectric constants of CdTeMoO6 single crystals was obtained using both resonance techniques and impedance analysis. The results demonstrate that the CdTeMoO6 crystals exhibit intriguing piezoelectric and elastic properties. The piezoelectric coefficients d14 and d36 reached 20.14 pC N−1 and 7.58 pC N−1, respectively, and the corresponding electromechanical coupling coefficients k14 and k36 were up to 22.78% and 19.48%, respectively. Furthermore, the relationship between the crystal structure and piezoelectric properties is also investigated. Our observations indicate that CdTeMoO6 crystals are good potential candidates for piezoelectric applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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