APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shijie Sun,Baijin Li,Wei Xiong,Boyu Fu,Yong Zhang,Zilin Ruan,Lei Gao,Xiaoqing Zuo,Jianchen Lu,Jinming Cai
Supramolecular self-assembly offers a feasible route for nanopatterning and functionality. The construction and precise control of selective adsorption at the molecular scale play essential roles in fundamental sciences and practical applications. Molecular tiling such as trihexagonal tiling Kagome networks has potential promising chemical and physical properties. Distorted Kagome-like networks controllable fabrication is possible by coupling molecular functional groups and substrate atoms. A chiral Kagome-like network was constructed using IFDO ([1,2-b]fluorene-6,12-dione) as precursor molecules complemented with molecular beam epitaxy and annealing strategies. Revealing arrangements of the assembled network of O-Cu metal coordination linked Kagome-like networks on the Cu(1 1 1) surface and their assembly mechanisms and cavity characteristics were explored in detail through scanning tunneling microscopy combined with density functional theory. Based on the electronic state difference between the hole center of the network and the molecular backbone, the host–guest network was successfully prepared by co-depositing C 60 molecules. Kagome-like networks could as an efficient template for regulating the adsorption configuration of C 60 . Our results demonstrate a controllable and efficient method to design atomically precise ordered host–guest assemblies on solid surfaces, advancing the approach is yet another step toward the fabrication of molecular devices.
研究领域:
表面科学
·
纳米材料学
·
超分子化学
·
凝聚态物理
·
分子自组装
·
扫描探针显微学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Qing Bao,Hua Li,Yang Li,Jinghui He,Qingfeng Xu,Najun Li,Dongyun Chen,Lihua Wang,Jianmei Lu
In this paper, two acceptor-donor-acceptor (A-D-A) type organic small molecules, 4,4'-(5,5'-(benzo[c] [1,2,5]thiadiazole-4,7-diyl)bis(3-hexylthiophene-5,2-diyl))bis(N-(4-nitrophenyl)-N-phenylaniline) (NTPA 2 TBT) and 4,4'-(5,6-difluorobenzo[c] [1,2,5]thiadiazole-4,7-diyl)bis(N-(4-nitrophenyl)-N-phenylaniline) (NTPA 2 BTF 2 ), were synthesized and fabricated into resistive random access memory devices. Compared with our previously reported molecule NTPA 2 BT, NTPA 2 TBT has 3-hexylthiophene linkages bridging its donor and acceptor, while there are two additional fluorine atoms in the benzothiadiazole moiety for NTPA 2 BTF 2. Both the fabricated memory devices based on these two new molecules perform nonvolatile ternary memory characteristics with lower threshold voltages , higher reproducibility and better stability. The addition of 3-hexylthiophene bridges significantly promotes the planarity of the conjugation backbone and facilitates the molecular stacking, while the substitution hydrogen by fluorine improves the intermolecular interaction , and thus also induces an ordered molecular stacking. The insertion of 3-hexylthiophene bridges or fluorine atoms could be an effective strategy of tailoring organic molecules to improve data storage performance with lower power consumption.
研究领域:
材料科学
·
有机电子学
·
分子器件
·
非易失性存储器
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yanqi Gu,Shayu Li,Yuehong Xu,Jiaguang Han,Miao Gu,Zhipeng Cai,Yan lv,Guoxin Xie,Tianbao Ma,Jianbin Luo
The influence of an external magnetic field on the picosecond network dynamics of the salt (KCl) solution is investigated by terahertz time-domain spectroscopy. Because hydration changes the motions of water molecules clusters, we test hydration by measuring the change of dielectric loss caused by the slow relaxation of water molecules clusters. We find experimentally that the magnetic field enhances the number of water molecules involved in hydration and the radius of dynamic hydration layer in salt solutions. However, with the increasing concentration, there is a downward in the hydration enhancement per equivalent. Meanwhile, the simulated results show the number of water molecules in hydration layers increases which is consistent with our experimental results. Besides, the simulation reveals that external magnetic field mainly affects the second hydration layer and the stability of water molecules network in hydration layer is enhanced with external magnetic field .
研究领域:
物理化学
·
生物物理
·
分子生物学
·
光谱学
·
溶液化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yanqiu Zhang,Hongguang Sun,Hussain Sadam,Yuyan Liu,Lu Shao
Organic solvent nanofiltration (OSN) membrane is an embryonic technology in chemical engineering for simultaneously purifying organic solvents and recycling nano-scale molecules. Although the inherent nano-cavity cyclodextrins (CDs) as powerful molecular hosts in supramolecular science ensure promise for separation technology, the limited synthesis toolbox and material choice impede the CDs deployment in membrane separations, especially for OSN applications. Herein, biocompatible β-cyclodextrin (β-CD) and mussel-inspired polydopamine (pDA) were discovered as the building blocks to simultaneously construct OSN membranes assisted by the host-guest interactions of supramolecular chemistry and hydrogen-bonds via one-step “green” process. Honeycomb microstructures were formed in this process, which adds the molecular transportation pathways. Such biopolymer membranes can remain extraordinarily stable in organic solvent environments, whilst achieving high rejection against angstrom-sized molecule with different charges toward environmental and energy benefits.
研究领域:
高分子科学
·
膜分离技术
·
化学工程
·
纳米材料
·
绿色化学
·
生物医用材料
·
超分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2013
·
IF 2.108
Pei Zhang,Hui Wang,Xia Liu,Xuefeng Shi,Jian Zhang,Guang Yang,Keji Sun,Jinben Wang
The dynamic surface tension and dilational viscoelasticity properties of amphiphilic polyamidoamine (PAMAM) dendrimers were investigated to probe the hydrophobic chain effect on the interfacial properties and the demulsification behaviors. The values of dynamic parameters n and t * representing diffusion speed of the molecules obtained according to the Rosen equation decreased with the increasing of bulk concentration. Taking the hydrophobic effect into consideration, the t * values decreased and n values increased with the increase of alkyl chain length, suggesting easier adsorption and faster diffusion for longer hydrophobic chain which was opposite to the tendency of traditional surfactants. Further dilational viscoelasticity studies demonstrated that the properties referring to adsorption and exchange-diffusion were probably affected by the aggregates conformation at the interface. Subsequently, from the demulsification experiments a conclusion can be drawn that the amphiphilic dendrimers with branched dendritic structure possesses superior properties of breaking W/O crude oil emulsions, showing a certain correlation to the dilational viscoelasticity properties.
研究领域:
胶体与界面化学
·
石油化学
·
高分子科学
·
流变学
·
表面活性剂化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Fang Long,Jing Wang,Zhaohui Zhang,Liang Yan
A novel magnetic molecularly imprinted electrochemical sensor (MMIP-sensor) combined with magnetic molecularly imprinted solid-phase extraction (MMISPE) was constructed for rapid and sensitive detection of tetrabromobisphenol S (TBBPS) in water samples. The magnetic molecularly imprinted polymer based on magnetic graphene/multi-walled carbon nanotubes hybrid composite (MMIP/Gr-MWCNTs) was prepared as MMISPE sorbet to separate and enrich TBBPS from complex system. Adsorption results showed that the MMIP/Gr-MWCNTs possessed excellent selective adsorption toward TBBPS with a maximum adsorption capacity of 17.83 mg g − 1 . The magnetic imprinted sensor based on the magnetic Gr-MWCNTs composite modified electrode was prepared by electropolymerization of dopamine monomer . The high sensitivity of the MMIP-sensor was attributed to the large specific surface area and excellent electrical conductivity of the magnetic Gr-MWCNTs composites. The detection limit of the MIP-sensor toward TBBPS was calculated as 2.1 × 10 − 11 mol L − 1 (S/N = 3). Under the optimum conditions, the MISPE-MMIP-sensor combination system provided 10–12 fold preconcentration than that of MMIP-sensor alone determination. The MISPE-MMIP-sensor was successfully used for detection of TBBPS in drinking water , rain water , lake water and tap water with recoveries of 88.4–98.8%.
研究领域:
分析化学
·
环境监测
·
电化学传感
·
分子印迹技术
·
水处理
·
污染物检测
✓ 已验证
DOI
高影响因子
Results in Physics
·
2023
·
IF 5.3
Meijie Zhu,Hua Xu,Zuoquan Tan,Le Wang
Large-area and uniform two-dimensional (2D) non-layered α-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D α-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown α-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D α-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
无机化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Guodong Zhou,Weitao Wang,Mao Peng
Molecular composites using rigid-rod macromolecules as the reinforcement have attracted tremendous research interest. However, dispersion of rigid-rod macromolecules at molecular level in the matrix remains a great challenge. Herein, we report new epoxy (EP)-based molecular composites with sulfonated aromatic polyamides , poly( p -sulfophenylene terephthalamide) (sPPTA) and poly(benzidine-2,2′-disulfonic acid terephthamide) (PBDT), as the reinforcement, which disperse uniformly in epoxy. Covalent bonds formed by the reaction between the sulfonic acid groups of the polyamides and epoxy prevent reaction-induced phase separation during high temperature curing. The novel molecular composites exhibit extraordinarily high strength and toughness, with maximum tensile strength of sPPTA/EP and PBDT/EP (100.2 ± 4.8 MPa and 121.9 ± 12.5 MPa, respectively) increased by ∼81% and ∼120%, respectively. To the best of our knowledge, the improvement of mechanical properties surpasses those of molecular composites, nanofiller reinforced thermosets and liquid crystalline thermosets ever reported.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2010
·Vol. 7
·期 1
·87-94
·
IF 6.171
Yi-Lun Ying,Hai-Yan Wang,Todd C. Sutherland,Yi-Tao Long
An aptamer is a specific oligonucleotide sequence that spontaneously forms a secondary structure capable of selectively binding an analyte. An aptamer’s conformation is the key to specific binding of a target molecule, even in the case of very closely related targets. Nanopores are a sensitive tool for the single-molecule analysis of DNA, peptides, and proteins transporting through the pore. Herein, a single α -hemolysin natural nanopore is utilized to sense the conformational changes of an adenosine 5’-triphosphate (ATP)-binding aptamer (ABA). The known DNA sequence of the ABA is used as a model to develop real-time monitoring of molecular conformational changes that occur by binding targets. The native, folded ABA structure has a nanopore unfolding time of 4.17 ms, compared with 0.29 ms for the ABA:ATP complex. A complementary 14-mer strand, which binds the ABA sequence in the key nucleic acids responsible for folding, forms linear duplex DNA, resulting in a nanopore transit time of 0.50 ms and a higher capture probability than that of the folded ABA oligomer. Competition assays between the ABA:ATP and ABA:reporter complexes are carried out, and the results suggest that the ABA:ATP complex is formed preferentially. The nanopore allows for the detection of an ABA in its folded, ATP-bound, and linear conformations.
研究领域:
分子生物学
·
生物传感器
·
核酸化学
·
单分子检测
·
转化医学
✓ 已验证
DOI
高影响因子
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2019
·
IF 2.367
Jingwen Luo,Jiang Sun,Xiaoting Luo,Yinghui Wei,Hangsheng Zheng,Chaofeng Mu,Wenjie Yao
Objective: This article aims to design low molecular weight chitosan (LMWC)-based conjugates of Rhein (RH) by means of an amino acid linker (Alanine) for improved solubility and enhanced bioavailability.Significance: Rhein is a potential candidate for the therapy of kidney disease. However, the poor solubility, inadequate bioavailability, and lack of proper formulation restrict its clinical applicability. LMWC-drug conjugates offer the potential to improve the water-solubility of RH, increase its oral absorption, and thereby enhance its bioavailability.Methods: The conjugates were synthesized via a carbodiimide reaction and confirmed using UV-vis, FTIR, and 1H-NMR spectroscopy. The water-solubility and in vitro release properties were evaluated. Free RH and RH-LMWC conjugates were administered at an equivalent oral gavage dose of RH at 35 mg/kg for pharmacokinetic studies in Sprague Dawley rats.Results: The conjugates with RH content of 9.65% were successfully synthesized and featured a satisfactory water-solubility of 9.73 mg/mL, which exhibited a sustained release pattern over 72 h, and the enzymes present may promote the degradation of the conjugate to increase the release of Rhein. Oral administration of RH-LMWC conjugates to rats led to seven-folds and 3.1-folds increase in the T1/2 and AUC0–∞, respectively, as compared to RH suspension.Conclusion: The present work demonstrated that the RH-LMWC conjugates exhibited sustained release properties with outstanding oral bioavailability enhancements compared to administration of RH itself. Potentially, RH-LMWC conjugates may serve as a promising lead for developing a new platform for RH oral delivery.
研究领域:
药剂学
·
药物化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2012
·Vol. 32
·期 6
·1699-1703
·
IF 2.686
Jing Ma,Hou Chen,Min Zhang,Chunhua Wang,Ying Zhang,Rongjun Qu
Yb-based catalyst was used for the first time for atom transfer radical polymerization using activators generated by electron transfer (AGET ATRP) of acrylonitrile (AN) with 2-bromopropionitrile (BPN) as initiator, 2, 2′-bipyridine (bipy) as ligand, and tisn(II) bis(2-ethylhexanoate) (Sn(EH) 2 ) as reducing agent in the presence of air. With respect to AGET ATRP of AN catalyzed by CuBr 2 , an evident increase of polymer tacticity was observed for AGET ATRP of AN. The increase of syndiotacticity became more and more pronounced than the increase of isotacticity of polyacrylonitrile (PAN) along with YbBr 3 content. The block copolymer PAN-b-PMMA with molecular weight at 60,000 and polydispersity at 1.36 was successfully prepared.
研究领域:
高分子化学
·
材料科学
·
催化化学
·
聚合物合成
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 39
·
IF 1.866
Hongxia Wang,Ting Guo,Houbin Li
Inks composed of renewable resources are important for the environment protection. We report preparation of a new type of edible chitosan-based flexographic ink. The performance of three inks, containing three different molecular weight (MW) chitosan, was analyzed by the different experimental techniques. The Ink viscosity was investigated from the parameters shear rate, time, temperature, and flexographic printing simulation. The printing quality on coated paper was studied by the scratch resistance, contact angle, print fastness, chromatic aberration, and dot gain. Viscosity recovery rate reached 69% after 6 s, and the print fastness was up to 91%. The experimental Δ E is 0.97, the dot gain is 23%, and contact angle is 69° for the best ink. Experimental results indicate that the developed ink is suitable for the flexographic printing with good application prospects. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43997.
研究领域:
高分子材料
·
印刷工程
·
绿色化学
·
食品包装
·
生物基材料
·
流变学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）