Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Du Wei,Gao Feng,Cui Peng,Yu Zhiwu,Tong Wei,Wang Jihao,Ren Zhuang,Song Chuang,Xu Jiaying,Ma Haifeng,Dang Liyun,Zhang Di,Lu Qingyou,Jiang Jun,Wang Junfeng,Pi Li,Sheng Zhigao,Lu Qingyi
The reversible transformation of a nanohelix is one of the most exquisite and important phenomena in nature. However, nanomaterials usually fail to twist into helical crystals. Considering the irreversibility of the previously studied twisting forces, the reverse process (untwisting) is more difficult to achieve, let alone the retwisting of the untwisted crystalline nanohelices. Herein, we report a new reciprocal effect between molecular geometry and crystal structure which triggers a twisting-untwisting-retwisting cycle for tri-cobalt salicylate hydroxide hexahydrate. The twisting force stems from competition between the condensation reaction and stacking process, different from the previously reported twisting mechanisms. The resulting distinct nanohelices give rise to unusual structure elasticity, as reflected in the reversible change of crystal lattice parameters and the mutual transformation between the nanowires and nanohelices. This study proposes a fresh concept for designing reversible processes and brings a new perspective in crystallography.
研究领域:
纳米材料
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晶体学
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材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yang Zhang,Caihao Wang,Ning Cao,Yang Liu,Chaocheng Zhao,Yongqiang Wang,Shaobin Wang,Jinqiang Zhang
Symmetrical planar unit cells and periodic layered structures of polymeric photocatalysts are the roots of poor light absorption and severe carrier recombination in photochemical process, which in turn diminish redox capabilities during photocatalytic overall water splitting. In this study, we synthesized porous and curled carbon nitride nanosheets (U-A400) featuring imperfect molecular structures through polycondensation of an asymmetric precursor molecule and a soft template. The twisted framework in U-A400 promoted strong n → π* electron transitions, generating a considerable built-in electrical field and prolonging the average fluorescence lifetime. Additionally, the structural distortion increased the number of surface acid-base active sites. Consequently, these adjustments in the micro- and topological structures rendered U-A400 highly effective for photocatalytic overall water splitting, achieving H 2 and O 2 average evolution rates of 65.93 and 38.53μmol g −1 h −1 , respectively, over 4 h of visible light (λ > 420 nm) irradiation, 38 times higher than those of graphitized carbon nitride. This work presents valuable insights into the development of advanced polymeric photocatalysts, efficiently harnessing sunlight for overall water splitting, thereby contributing to sustainable energy conversion and clean fuel production.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Liyang Zhang,Yangqin Gao,Ziyu Teng,Yida Liu,Xinming Liu,Chuanbo Cong,Kezhen Lai,Linping Li,Jipeng Dong,Ning Li,Lei Ge
Mimicking the movement of leaves in response to external stimulations is inspiring for designing photocatalyst system applicable in space- and weight-sensitive scenarios. Here, we demonstrate that by combining a novel gas–liquid film growth process with a tape assisted film transfer procedure driven by capillary force, a lightweight and twistable photocatalyst assembly can be easily constructed. Taking the gas–liquid interface as a solute transfer boundary to selectively trigger the film growth at the interface, BiOI and BiOI/In 2 O 3 thin films up to 15 cm in diameter can be grown at a solution surface. Thanks to the capillary force present at the dynamic contact front during the film pick-up procedure, the grown film can be peeled off from the solution surface with tape so that a lightweight BiOI/In 2 O 3 /tape assembly can be easily constructed. Due to its low density and the BiOI/In 2 O 3 heterojunction formed, the resulting BiOI/In 2 O 3 /tape assembly exhibits superior photocatalytic activity per gram towards NO removal. Furthermore, the capillary force driven film pick-up process also induces a tight contact between the film and the tape, which makes the assembly highly twistable: its structural integrity and photocatalytic activity are largely preserved after 10,000 twists. Utilizing the film’s flexibility and twistability, we assemble a temperature-, auto-folding/unfolding photocatalyst system by transferring the film onto a memory-alloy-based structure, which mimics the movement of leaves in response to external stimulations and makes the gas–liquid interface-derived BiOI/In 2 O 3 /tape assembly suitable for use in space- and weight-limited environments.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jindong Bai,Yongsong Wang,Dingbang Yang,Xiao Guo,Yuedong Wang,Tao Xu,Haipeng Xie,Jin Li,Fangping Ouyang,Han Huang
Twisting between layered materials in close proximity causes reconstruction of the electron and crystal structures. The resulting reconstruction has received increasing attention due to the realization of magic-angle superconductivity, moiré excitons, and moiré ferroelectricity. However, demonstrations of such concepts for phonon polarization have been very limited. Here, we reported on the systematic angle-dependent polarized Raman (ADPR) investigations on the twisted bilayer (tBL) α-MoO3 with each layer in a thickness of ∼14 nm. Under 532 and 633 nm excitation, (i) the Raman intensity (I) of representative Mo–Oc symmetric stretching vibration phonon mode (SVPM) at 818 cm–1 and rigid MoO4 translational vibration phonon mode (TVPM) at 156 cm–1 decreases monotonically with the twist angle (φ) increase and (ii) the polar plots of both modes were tuned from axial symmetry to central symmetry by φ increase. The dependence of I and symmetry of both modes on φ were described semiquantitatively by applying the classical Placzek approximation and the interference effect. Our findings unravel the complex interaction between the twisted layer configurations and phonon behaviors of α-MoO3, providing valuable insights into the anomalous phonon polarization responses in low symmetric two-dimensional materials and potentially facilitating the development of technologies based on tunable phonon polarization.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2017
·Vol. 23
·期 42
·10092-10099
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IF 5.317
Jing Zhang,Qing Tang,Zhong-Zheng Gao,Sheng-Chao Qiu,Ying Huang,Zhu Tao
Graphical Uniquely responsive : The interaction of thiazole orange (TO) with twisted cucurbit[14]uril ( t Q[14]) was investigated, and formation of a stable fluorescent t Q[14]/TO complex was observed. The t Q[14]/TO complex exhibited unique fluorescence responses to Hg 2+ , Ba 2+ , and Pb 2+ cations in different aqueous media (see figure). Thus, a fluorescent sensor for three heavy-metal ions was developed. A water-soluble fluorescent sensor based on the interaction of twisted cucurbit[14]uril ( t Q[14]) and thiazole orange (TO) in aqueous solution was developed. Formation of the t Q[14]/TO complex gives rise to stronger fluorescence in both neutral and acidic aqueous solutions compared with that of free TO. Further experiments on the interaction of the t Q[14]/TO complex with metal ions revealed that, from a series of nineteen selected common metal ions, 1) only Hg 2+ can lead to fluorescence enhancement and then quenching of the t Q[14]/TO (2:1) complex in neutral aqueous solution; 2) only Ba 2+ can induce fluorescence quenching of the t Q[14]/TO (2:1) complex in aqueous HCl solution (pH 2); furthermore, the t Q[14]/TO/Ba 2+ systems exhibit reversible changes in fluorescent intensity on successively adding SO 4 2− and Ba 2+ ; and 3) only Ba 2+ or Pb 2+ can induce fluorescence quenching of the t Q[14]/TO (15:1) complex in aqueous HCl solution (pH 2). Thus, the t Q[14]/TO complex can act as a supramolecular fluorescence-based sensor for the determination of Hg 2+ , Ba 2+ , and Pb 2+ ions.
研究领域:
化学
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分析化学
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超分子化学
✓ 已验证
DOI
PubMed
高影响因子
Nano Energy
·
2023
·
IF 17.6
Shule Huang,Gui Wang,Xinmiao Xuan,Moran Qin,Jieming Huang,Lirong Wang,Xiaoming Zhang,Nan Wang,Junwei Zhang,Zhipeng Hou,Xingsen Gao,Zhang Zhang,Junming Liu
Piezoelectricity in 2D transition metal dichalcogenides (TMDs) has gathered significant interest due to their massive exposure of unsaturated edge sites and high piezoelectric modulus. Nevertheless, the piezoelectricity in 1 T′ phase TMDs is inhibited by its center symmetry of space group. Herein, to break the shackles of piezoelectric polarization, we synthesize a piezoelectric material composed of an atomic molybdenum array bound to distorted 1 T′ ReS 2 (MDR). The phase transition from 1 T′ to distorted 1 T′ (D-1 T′) removes the special Peierl's distortion of ReS 2 , breaking its center symmetry and allowing for piezoelectric generation. Remarkably, MDR exhibits a large piezoelectric coefficient ( d 33 ) value of 15.45 pm/V, which is an order of magnitude higher than those reported in other TMDs. Combining with excellent piezocatalytic activity, a 0D/3D di-piezoelectric porous electret featuring an enhanced quantum confinement piezoelectric effect based on the MDR quantum dots (QDs) and inverse opal g-C 3 N 4 (IOCN) is demonstrated for high-efficiency piezoelectric catalysis.
研究领域:
材料科学
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纳米技术
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jun Zhou,Tianrong Li,Qinzhen Li,Peisen Zheng,Sha Yang,Jinsong Chai,Manzhou Zhu
Introduction of chiral ligands has been regarded as an effective strategy to obtain nanoclusters with optical purity. However, how the chiral ligands work is still unclear due to the lack of structural comparison between racemic nanoclusters and the corresponding optically active ones. In this work, three structurally related Au24Cd2 nanoclusters, including one racemic and two homochiral nanoclusters, were synthesized, and their crystal structures were characterized using single-crystal X-ray crystallography (SC-XRD). Based on their crystal structures, the origin of the chirality in Au24Cd2 was found to be the twist of the kernel and the chiral arrangement of the metal–ligand surface. Au24Cd2 protected with chiral ligands exhibits a more twisted kernel than the racemic one. Therefore, the chirality of chiral diphosphine was found to transfer from the ligands to the metal–ligand interface and then to the metal core, inducing its distortion to produce enhanced chirality. In addition, the optical properties including optical absorption and circular dichroism of these structurally related Au24Cd2 nanoclusters were compared.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2016
·
IF 2.244
Dingqian Shi,Kun Hu,Pei Chen,Weisong Du,Aiai Gao,Ran Chen,Xinbing Chen,Zhongwei An
A series of nematic heterocyclic liquid crystals, 2-(2ʹ-fluoro-4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-benzoxazole derivatives (coded as nPF(2)PBx) bearing hydrogen (nPF(2)PBH), methyl (nPF(2)PBM) and nitro (nPF(2)PBN) terminal groups, respectively, are developped and investigated. The results show that the nematic mesophase stability is obviously improved via a slightly increase in the inter-ring twist angle between the planes of two phenyl rings in the biphenyl unit, where modification of the twist angle can be achieved by adjusting the position of the lateral monofluorine substituent from the outer to the inter ring of the biphenyl mesogenic core unit. Meanwhile, the inter-ring lateral fluorine substituent results in a decrease in both melting and clearing points but only a nematic mesophase with an acceptably wide mesophase range for nPF(2)PBx, and thus a potential application in liquid crystal display mixtures is expected, especially for the compounds nPF(2)PBM and nPF(2)PBN. The reduced π–π interaction/conjugation caused by the increased twist angle is considered as one of the possible reasons for the formation of a nematic mesophase.
研究领域:
材料科学
·
液晶化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Hanjun Li,Fulin Yang,Guanghua Wang,Liheng Guan,Feili Lai,Nan Zhang,Tianxi Liu
The development of efficient electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is essential for anion exchange membrane fuel cells and advancing the hydrogen economy. Herein, we demonstrated PtRuRhPdIr high-entropy alloy aerogels (HEAAs) with highly distorted structure as efficient HOR electrocatalysts and realized effective control of PtRu-based metallic aerogels (MAs) with elemental components ranging from two to seven. Specially, PtRuRhPdIr HEAAs on carbon (PtRuRhPdIr HEAAs/C) exhibit excellent HOR activity, with Pt group metal (PGM)-normalized mass activity (5.75 A mgPGM–1) at 50 mV and exchange current density normalized by electrochemical surface area (0.69 mA cm–2), approximately 16.9 and 4.1 times that of the commercial Pt/C (0.34 A mgPGM–1, 0.17 mA cm–2), respectively. The mechanism study shows that the highly distorted PtRuRhPdIr HEAAs provide abundant unsaturated sites for HOR, and the synergistic effect of multiple-active sites balances the adsorption of H* and *OH, boosting the HOR performance.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 37
·22882-22891
·
IF 3.108
Ying Zhao,Dong Xue,Honglan Qi,Chengxiao Zhang
A blue light emitting pyrene derivative, 1-methyl benzoate-pyrene (MB-Py), was synthesized by employing a pyrene moiety as the parent linked with a small electron-donating group, methyl benzoate. Owing to the introduction of methyl benzoate, there is an evident twisted configuration between the methyl benzoate moiety and the central pyrene core with a dihedral angle of 56°, confirmed by density functional theory (DFT) calculations. The basic photophysical, electrochemical and electrogenerated chemiluminescence (ECL) properties of MB-Py together with those of the parent pyrene (Py) and the analogue benzo[α]pyrene (Bz-Py) in MeCN : Bz (v/v = 1 : 1) were extensively characterized for the first time. The electrochemical behavior of MB-Py showed a quasi-reversible one-electron oxidation (E1/2 = +1.11 V vs. SCE) and two reversible closely spaced consecutive one-electron reductions (E1/2,1 = −2.12 V and E1/2,2 = −2.27 V vs. SCE). This redox behavior was confirmed by CV digital simulations and was consistent with the frontier molecular orbitals calculated. It was found that, unlike its parent Py and analogue Bz-Py, MB-Py showed a single-peaked absorption (343 nm) and a blue monomer photoluminescence (PL) emission (428 nm) with a large Stokes shift (85 nm). The electrogenerated radical ions of MB-Py are stable enough to produce an efficient ECL emission (439 nm) through ion annihilation with the S-route. The ECL spectra of MB-Py obtained in both the ion annihilation and coreactant processes are similar to the monomer PL spectrum. This nonplanar twisted conformation pyrene derivative imparts steric hindrance, prevents excimer formation and results in a high PL efficiency and efficient, stable blue ECL monomer emission. Owing to their rigid planar structures, Py and Bz-Py exhibited monomer and excimer blue-violet PL emissions and cyan/green ECL emissions, and could not be used as appropriate blue luminophores.
研究领域:
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2021
·
IF 0
Hao-Zhou Huang,Yue-Hua Cong,An Du,Bing Hu,Bao-Yan Zhang
A new series of liquid crystalline dimers containing a cholesteryl group were synthesised, exhibiting multiple mesophases including chiral smectic phases (SmC* and SmA*), twist grain boundary phases (TGBA*), and chiral nematic phase (N*). The chemical structure and liquid crystal properties of the dimers were characterised by FTIR, 1H-NMR, DSC, POM and XRD. It was in evidence that the lengths of the terminal tail and the flexible spacer were the decisive factors of the mesophase behaviours.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Chenlu Liu,Xiaoting Feng,Keming Zhang,Xiaohe Tian,Qingnan Wang,Yanting Tang,Yueyangchao Yu,Tianhe Gu,Rui Zhang,Xiangyu Liu,Shaofei Wang
Polyamide membranes with rigid twisted structures show excellent permeance and rejection in the field of organic solvent nanofiltration (OSN). However, challenges such as low reactivity, complex synthesis procedures, and high costs persist for certain rigid and twisted monomers, posing obstacles in their synthesis or application processes. To address these challenges, we adopt a low-cost rigid and twisted tetraamine monomer, N,N,N′,N′-tetrakis(4-aminophenyl)-1,4-benzenediamine (TK), for the preparation of polyamide OSN membranes through interfacial polymerization with various acyl chlorides. TK is effectively introduced into the polyamide chain, which involves not only the reactivity of monomers, but also the influence of monomer angle configuration on the formation of chain segments, forming different rigid networks and enabling the active layer to have excellent stability and high porosity. Consequently, the rigid twisted polyamide OSN membranes exhibit a methanol permeance of 13.8 L m −2 h −1 bar −1 and a molecular weight cut-off (MWCO) of 266 Da, outperforming many reported membranes. This work highlights the use of TK as a promising, cost-effective monomer to engineer high-performance OSN membranes with tailored structural features, offering a practical solution for enhanced organic solvent separation processes.
研究领域:
材料科学
·
分离技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）