PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·
IF 2.9
Fuge Niu,Xinyu Hu,Christos Ritzoulis,Weiwei Tu,Xurui Zhao,Yuanzhi Xia,Yinghua Lu,Junfeng Yin,Weichun Pan
The formation of aggregates was studied in amino acid aqueous solutions. Regarding to arginine (Arg), the main driving force to form aggregates is hydrogen-bonds between the Arg molecules. The measurement of energy loss during this process, coupled with morphology data indicate that this aggregate is in solid state. The aggregation has two steps, with a liquid intermediate stage. An investigation of the effect of pH and solute concentration upon aggregate formation for other amino acid aqueous solutions verifies that aggregate formation is amino-acid specific, while small size of clusters formed by weak interactions lead to large size aggregation. Homochirality is observed in the aggregates; its existence sheds light on the origin of protein homochirality.
研究领域:
生物化学
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 32
·期 2
·536-547
·
IF 5.3
Chen Weishuo,Zhong Channa,Li Shuangcheng,Wen Die,Zhou Dongdong,Shao Jun,Chen Shuiliang,Hou Haoqing,Xiang Sheng
The blends of poly(D-lactic acid) and poly(L-lactic acid) (PDLA/PLLA) produce the stereocomplex crystals (SC) with a melting temperature of ~ 250 °C, which exhibits higher crystallization rate and mechanical strength than PDLA or PLLA. The SC was also reported as an effective nucleator for PLA homochiral crystals (HC). In the PDLA/PLLA blends, the SC would develop at first in most of cases. However, the morphology of SC in the asymmetric blends were rarely reported, and the effect of the SC morphology on the subsequently crystallization of HC was not clear yet. In this study, the PDLA/PLLA blends with dissimilar weight ratios were prepared by three methods, i.e. , electrostatic spinning, solution casting, and melted-cooling, and the SC with different morphologies were achieved. Then, the crystallization behavior of HC under the existence of SC was studied. Results indicated that the SC morphology exerted diverse effects on the formation of HC. The SC with fibrous and banded morphology produced by electrostatic spinning presented great limitation for the formation of HC. The SC with spherical morphology developed in the solution casting films enhanced the formation of HC. The SC with network structure produced in the melted-cooling specimens accelerated the crystallization rate of HC significantly. This investigation indicated that not only the content of SC, but also the morphology of SC would influence the crystallization behavior of HC, which would make a deep understanding for the crystallization behavior of PDLA/PLLA specimens.
研究领域:
高分子科学
·
材料科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 1
·128-133
·
IF 5.934
Yu-Ling Liu,Jia-Zhen Ge,Zhong-Xia Wang,Ren-Gen Xiong
Ferroelectrics as a class of technically important materials have been eagerly pursued, similarly to the gold rush. In particular, in recent years, molecular ferroelectrics have stood out because of their variable structures and excellent properties. However, the discovery of new ferroelectrics is often random rather than strategically designed. Homochirality provides an important bridging effect between structure and properties, in which homochiral crystals tend to crystallize in polar space groups, increasing the possibility of the integration of homochirality with ferroelectricity. In this study, the strategy of homochirality was utilized to realize ferroelectricity in enantiomorphic metal–organic complex crystals based on a nonferroelectric racemic mixture. Unlike the nonferroelectric racemic mixture, both Cu(1,10-phenanthroline)2SeO4·(R-1,2-propanediol) and Cu(1,10-phenanthroline)2SeO4·(S-1,2-propanediol) adopted the enantiomorphic-polar point group 1 (C1) at ambient temperature and display mirror images, as verified by the crystal structure analysis and vibrational circular dichroism (VCD) spectra. The enantiomers show 2F1-type ferroelectric phase transitions, including a similar phase transition temperature (Tc) and other ferroelectric properties. This finding reveals that the introduction of homochiral molecules provides significant structure-related physical properties crucial for the effective design of homochiral molecular ferroelectrics.
研究领域:
材料科学
·
晶体学
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DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2021
·Vol. 63
·期 3
·267-274
·
IF 1.206
Jun Shao,Tang Juan,Pu Shouzhi,Hou Haoqing
Abstract Blending of poly( L -lactic acid)/poly( D -lactic acid) (PLLA/PDLA) leads to the formation of poly(lactide) stereocomplexation (PLA SC), which exhibits higher melting temperature and faster crystallization rate. The crystallization behavior of PLA homochiral crystallization (HC) under the existence of PLA SC was also widely investigated. During the variable processing, the SC with different morphologies would produce, and these SC could exert different influences on the subsequent formation of HC. However, the effects of SC developed in various conditions on the formation of HC are not compared yet and are also not clear until now, and which is important for the application of PLLA/PDLA blends. In this paper, the PDLAs with different molecular weights were blended with PLLA at a weight ratio of PLLA/PDLA 90/10, and the crystallization behaviors of PLLA HC from different conditions were investigated by differential scanning calorimetry (DSC). Results indicated that, incorporating a small amount of PDLA accelerated the formation of PLLA HC significantly regardless of the SC developed from the solution evaporation or the melt. The higher crystallization rate of HC was received in the PLLA/PDLA specimens with lower molecular weight of PDLA. For the specimens crystallized from the partially melting (most of SC developed during solution evaporation), the crystallization rate was higher than that corresponding specimens crystallized from the completely melting state (the SC were produced from the melt). This discrepancy would be due to variable SC morphologies produced during diverse processing.
研究领域:
高分子材料学
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材料科学
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DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Wenze Li,Mengyao Wang,Huan Luo,Yanhua Niu,Yajiang Huang,Guangxian Li
A high molecular weight (H M w ) PLLA has been blended with a low molecular weight (L M w ) PDLA and its two types diblock copolymers (PEG- b -PDLA and PDMS- b -PDLA), respectively, to investigate the stereocomplex (sc) and homochiral (hc) crystallization behaviors . The miscible PEG and immiscible PDMS segments with comparable molecular weight were introduced into PDLA by bulk ring-opening polymerization method. Compared to PLLA/PDLA, the introduction of both sequences could inhibit the crystallization kinetics of sc and hc crystallites of the blends due to the dilution effect of L M w segments. The formation of sc crystallites is prior to its hc counterparts. The shorter induction period of hc crystallites of PLLA/PEG-b-PDLA blend indicates that the miscible PEG segments could promote the mobility of PLLA chains. Due to the involving of PEG chains, the spherulite exhibits coarsen and irregular texture and its lamellae show sparse string-like structure. The microphase separation between PLA and PDMS segments as evidenced by SAXS results in the increased sc nuclei and different growth mode of hc crystallites. The phase separated microdomains weakened the competition between sc and hc crystallites, and the former acts as a template for repeated assembly of the latter. X-ray analysis also reveal that sc crystallites possess much thicker lamellar thickness than hc crystallites in PLLA/PDLA and PLLA/PEG-b-PDLA blends.
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2022
·
IF 1.869
Xu Zhu,Ruiying Wang,Yafang Ge,Yingling Dong,Benlai Wu
A new two-dimensional (2D) homochiral cadmium(II) coordination polymer, {[Cd4(OH)2(L)2(pea)4]·CH3OH}n (1) (pea = (S)-1-phenylethanamine), was solvothermally synthesized based on an enantiomerically pure chiral ligand (S)-5-(((1-carboxy-2-phenylethyl)amino) methyl)isophthalic acid (H3L). Crystal structure analysis shows that 1 is a 2D homochiral framework consisting of coaxial double-helical chains where a pair of left- and right-handed 21 helixes shares tetranuclear Cd cluster subunits [Cd4(μ3-OH)2]. Topologically, 1 is an interesting 3,6-connected network with the point symbol of (43)2(46·66·83). The thermal stability and solid-state optical properties, including circular dichroism, and nonlinear optical and luminescent properties of 1 were systematically investigated. Furthermore, the fluorescence response of 1 to various common solvents and metal ions was preliminarily studied. Interesting enough, N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMA), acetone and Fe3+ ion have strong quenching effect on the fluorescence of 1, indicating that 1 has certain potential application in the visual detection of these species.
研究领域:
材料化学
·
配位化学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Ning Liu,Junyao Li,Wenrong Cai,Datong Wu,Yong Kong
Chiral metal–organic frameworks (CMOFs) have attracted considerable attention in chiral discrimination and separation. In this work, a simple CMOF is synthesized through a facile one-pot method by using Zn(II), tetra(4-carboxyphenyl)-porphyrin (TCPP), and d-phenylalanine methyl ester (d-Phe-OMe) as metal ion, organic ligand, and chiral source, respectively. Interestingly, the CMOFs synthesized at different temperatures (25 and 160 °C) display quite different morphologies and diametrically opposite chirality due to the different interaction modes between TCPP and d-Phe-OMe at 25 and 160 °C. Next, the CMOFs synthesized at 25 and 160 °C are utilized for the chiral discrimination of the isomers of tryptophan (Trp), resulting in exactly the reverse effect. The developed CMOF-based chiral sensors also exhibit excellent reproducibility, suggesting their great potential for chiral analysis.
研究领域:
材料科学
·
化学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiaoyu Yang,Shunbi Xie,Runzi Zhang,Yao Liu,Weifen Wu,Yi He
Excessive plastic consumption can pose potential risks to the human respiratory and circulatory systems, leading to various diseases. Therefore, the sensitive detection of plastics holds significant implications for ensuring food safety, environmental protection, and human health. Conducting tests on rivers and drinking water can ensure their compliance with relevant safety standards, thereby mitigating the potential environmental and health risks associated with plastic pollution. In this experiment, we prepared a roseate petal homochiral nanogold (Au RHNs) as a surface-enhanced Raman scattering (SERS) substrate for detecting plastics in the water. Due to the intricate rose petal-like surface and structures with symmetry breaking, which result in a large surface area, the mean enhancement factor (EF) of the Au RHNs was determined to be 8.4696 × 10 5 . The Au RHNs as the SERS substrate were used to test the plastic polyethylene (PE) and polyvinyl chloride (PVC), with the detection limits of 0.0986 mg/mL and 0.0975 mg/mL, respectively. Moreover, the prepared Au RHNs substrate were successfully applied for ananlyzing analyze actual samples (tap water, mineral water, river water), yielding a satisfactory recovery rate. The exceptional performance of Au RHNs as a SERS detection substrate indicated its promising potential for practical detection of plastic samples.
研究领域:
环境科学
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材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 38
·期 4
·556-561
·
IF 2.594
Jiao Kong,Mei Zhang,Ai-Hong Duan,Jun-Hui Zhang,Rui Yang,Li-Ming Yuan
Metal–organic frameworks are promising porous materials. Chiral metal–organic frameworks have attracted considerable attention in controlling enantioselectivity. In this study, a homochiral metal–organic framework [Co 2 (D-cam) 2 (TMDPy)] (D-cam = d -camphorates, TMDPy = 4,4′-trimethylenedipyridine) with a non-interpenetrating primitive cubic net has been used as a chiral stationary phase in high-performance liquid chromatography. It has allowed the successful separation of six positional isomers and six chiral compounds. The good selectivity and baseline separation, or at least 60% valley separation, confirmed its excellent molecular recognition characteristics. The relative standard deviations for the retention time of run-to-run and column-to-column were less than 1.8 and 3.1%, respectively. These results demonstrate that [Co 2 (D-cam) 2 (TMDPy)] may represent a promising chiral stationary phase for use in high-performance liquid chromatography.
研究领域:
材料科学
·
分析化学
·
手性分离技术
·
多孔材料
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Congshu Feng,Yun Chen,Jun Shao,Haoqing Hou
Blending of poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) would produce polylactide stereocomplex crystallites (PLA SC). In the PLLA/PDLA specimens prepared by solution mixing or melt blending, the isomeric polymers were mixed in the molecular level. When the distance of these isomers increased, the crystallization behaviors of PLLA/PDLA were not clear yet. In this study, PLLA/PDLA blends were prepared by different electrospinning methods, i.e., spinning by mixed solution (DL-A), side-by-side mode (DL-B), and double spinnerets (DL-C). Results revealed that the distances between isomeric molecules increased in the order of DL-A, DL-B, and DL-C, and this distance influences the phase transition and subsequently crystallization behaviors. In the DL-A, the homochiral crystallites (HC) developed at first, and then SC formed in the specimen with lower content of PDLA. The formation of SC was observed at first, and less or no content of HC was developed with higher content of PDLA. For the DL-B group, the formation of HC was observed at ∼100 °C, and the SC were produced around 140 °C irrespective of composition. More content of SC was produced during or after melting of HC. When referring to the DL-C group, the HC developed at the first stage, and the SC were produced during or after melting of PLA HC. In addition, the SC that developed in the three groups have different nucleation efficiencies for the subsequent formation of HC. The nucleation efficiency increased in the order of DL-A < DL-B < DL-C, and these results hinted that not only the content but also the distribution of SC affects the formation of HC.
研究领域:
材料科学
·
高分子科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Pharmaceutical Analysis
·
2021
·
IF 4.769
Xiaodong Sun,Bing Niu,Qi Zhang,Qin Chen
Homochiral metal-organic frameworks (MOFs) have attracted considerable attention in many fields of research, such as chiral catalysis and chiral chromatography. However, only few homochiral MOFs can be effectively used in capillary electrochromatography (CEC) and their performances are far from adequate. In this study, we successfully synthesized achiral nanocrystalline MIL-53. A facile post-synthetic modification strategy was then implemented to functionalize the product, yielding a homochiral MOF: l -His-NH-MIL-53. This MOF was then employed as a chiral coating in open-tubular CEC mode (OT-CEC), and, as such, it exhibited high enantioselectivities for several racemic drugs. The homochiral MOF and the fabricated capillary coating were systematically characterized using transmission electron microscopy, scanning electron microscopy (with energy-dispersive X-ray spectrometry), Fourier-transform infrared spectroscopy, X-ray diffractometry, thermogravimetric analysis, circular dichroism spectroscopy, Brunauer-Emmett-Teller surface area measurements, and X-ray photoelectron spectroscopy. This study is expected to provide a new strategy for the design and establishment of MOF-based chiral OT-CEC systems.
研究领域:
分析化学
·
材料科学
·
色谱学
·
纳米技术
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Zhou Jiayi,Gao Yuzhe,Zhang Deyi,Ren Kexin,Dai Mengqi,Wang Huan,Qi Limin
Chiral plasmonic nanomaterials have attracted significant attention due to their fascinating chiroptical properties and promising applications including chiral sensing, asymmetric catalysis, biomedicine, and chiroptics. Self-assembly of plasmonic nanoparticles is promising for constructing chiroplasmonic nanomaterials, but it remains challenging to obtain homochiral assemblies with high optical asymmetry. Here, gold nanodumbbells featuring a concave morphology are employed as achiral building blocks for controllable self-assembly into stable homochiral assemblies exhibiting strong chiroptical activity. The formation of helically stacked side-by-side assemblies with right handedness is triggered by introducing bovine serum albumin as the chiral additive. Remarkably, an asymmetry factor as high as 0.23 is obtained for the chiral assemblies. It is revealed that the concavity of the nanodumbbells considerably enhances the chirality and stability of the assemblies. Furthermore, the chiral assemblies are utilized as hosts for achiral fluorescent species to generate circular polarization luminescence. This work may advance the structural design of building blocks for chiral assembly toward novel chiroplasmonic nanomaterials.
研究领域:
纳米技术
·
材料科学
·
物理化学
·
光学
·
化学合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）