Coatings
·
2018
·Vol. 8
·期 4
·141
·
IF 2.35
Nianrui Qu,Shuxin Sun,Qianran Zhao,Tifeng Jiao,Jingxin Zhou,Ruirui Xing,Faming Gao,Lexin Zhang,Qiuming Peng
The design and preparation of functional bolaamphiphile-based composite films are of key importance for application in a wide variety of fields. This study demonstrates a new approach to constructing composite films by the Langmuir-Blodgett (LB) method using a fluorine-containing bola-type diacid derivative with different metal ions. The bola-type molecule we used could be spread on water surfaces and metal ion subphases to fabricate various nanostructured ultrathin films. The obtained data demonstrated that the employed metal ions, including Ag(I), Cu(II), and Eu(III) ions in subphase solutions, can regulate the organized molecular stacking and form interfacial nanostructures deposited in LB films. It was found that the interfacial coordinating interactions can easily occur between carboxyl groups in a molecular skeleton with metal ions in the formed composite films. The formation of composite films was confirmed by changes in the surface pressure-area isotherms, morphologies, and spectra of the transferred LB films. While various research works have achieved the regulation of functions and nanostructures of sophisticated bola-type compounds, we here demonstrate a simple routine to modulate the nanostructures and organized packing of bola-type compounds composite films by changing the metal ions in subphase solutions.Keywords:composite Langmuir film;nanostructure;bola-type diacid;fluorine-containing spacer;self-assembly;metal ion coordination
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Ziyan Wang,Jingyao Li,Yanbin Sun,Jiangtao Peng,Jian Wang,Yizhan Hao,Wenqing Li,Peiping Zhang,Weikun Ning,Shiding Miao
The fluorescence resonance energy transfer (FRET) between donor-acceptor molecules of fluorescein (FL) and rhodamine B (RhB) was enhanced by clay sheets of laponite. This enhancement was implemented by the Langmuir-Blodgett (LB) technique. Hybrid films were prepared by incorporating elementary clay sheets into dye molecules (FL and RhB for different molar ratios) at the air/water interface. The spectroscopic measurements (UV–Vis absorption and photoluminescence) of these mixture systems (FL, RhB and clay mineral) were analyzed both in colloidal dispersion and LB films . A high efficiency (92%) of FRET from FL to RhB was achieved with presence of laponite. Characterizations such as surface pressure versus area (π-A) isotherms, atomic force microscopy (AFM) and contact angle measurements were used to confirm the successful incorporation of clay sheets in hybrid films with loaded dye molecules. The clay incorporation were indicated to shorten the distance between donor and acceptor chromophores (Förster radius), which was realized by the tightly bounded dye molecules on clay sheets and self-assembly of dye molecule pairs.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
·
2017
·
IF 1.02
Li-fang Shi,Jun-zhe Liu,Jun-he Yang,Ling-fei Cai,Li-yun Shi,Han-xun Qiu
Silver microwires (AgMWs) were made amphiphilic by non-covalent functionalization with poly (vinyl pyrrolidone) and hexadecyl mercaptan. The Langmuir-Blodgett (LB) technique was used to transfer graphene oxide (GO) and the functionalized AgMWs (F-AgMWs) onto a quartz substrate to obtain GO-AgMW hybrid films. The films had a high optical transparency and an antibacterial property against Escherichia coli ( E. coli ). It is proposed that the GO layer not only acts as an adhesive layer for AgMWs, but also is acidic, which provides an ideal reaction condition for AgMWs to release the Ag + ions that fight E. coli . The influence of pH value on the antibacterial property of the hybrid films was investigated in order to verify the proposed mechanism. Further development of this method may provide a way to produce next generation transparent multifunctional thin films with antibacterial properties.
研究领域:
材料科学
·
纳米科技
·
生物医学工程
·
表面科学
·
抗菌材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Ziyan Wang,Jiwen Si,Zhenguo Song,Peng Zhang,Jian Wang,Yizhan Hao,Wenqing Li,Peiping Zhang,Shiding Miao
Froth flotation is most common means in mineral separation, and the in-situ measurement of flotation is of significance. However there were no instrumental means of measuring kinetics and thermodynamics for this process up to date. Herein, for the first time a facile method was developed by using Langmuir-Blodgett (LB) technique to get precise recording of kinetics and thermodynamics for adsorption process of Langmuir hybrid layer at the air/water interface. The formation of hybrid Langmuir monolayer was assumed to simulate the adsorption of mineral particles by frother/collector bubbles in the micro-flotation although this was a semi-static adsorption process. The kinetic parameters including time constant (τ 1/e , 32.0∼139.0 s) and adsorption rate constant (k, 0.0315∼0.00718 s −1 ) were precisely determined according to surface pressure vs. time (π-t) plots of Langmuir monolayer which consisted of floated minerals particles and collector molecules. The thermodynamic data such as partition coefficient (K d , 0.221−0.339), Gibbs free energy of adsorption ΔG (2.68∼3.74 kJ mol −1 ), and minimum dosages of collector molecules (potassium butylxanthate) were derived from the surface pressure vs. molecular area (π-A) isotherms. Taking the major mineral of pyrite with minor of dolomite and quartz as a froth flotation model, the recovery yield of concentrate pyrite obtained from LB technique was found in good agreement with the common tests used micro-flotation, suggesting the consistency of the new-developed LB method in predicting kinetics and thermodynamics for froth flotation .
研究领域:
矿物加工工程
·
界面化学
·
分离科学
·
物理化学
·
材料表面科学
✓ 已验证
DOI
高影响因子
Soft Matter
·
2025
·
IF 2.8
Manas Kumar Mandal,Shujiao Chen,Shuai Zhang,Qunhui Yuan,Wei Gan
Biocompatible and bioavailable ionic liquids (ILs) are generally used to modify the physicochemical properties of lipid monolayers and bilayers. Understanding the influence of ILs on lipid properties and the molecular level mechanism is crucial for applying ILs in lipid membrane modifications. Here the modification of a lipid membrane composed of 1,2-dioleoyl-sn-glycero-3-phosphoglycerol (DOPG) and cholesterol using alkyl methyl imidazolium-based ILs [Cnmim]Cl with varied alkyl chains (n = 4, 6, 8 and 10) was investigated. Langmuir monolayers were used to evaluate the influence of the ILs on the rigidity and robustness of the membranes. Then, selected compositions were used to prepare small unilamellar vesicles (SUVs) as nanocarriers. A small amphiphilic molecule (4-(4-diethylaminostyry)-1-methyl-pyridinium iodide, D289) was used as a probe to investigate the loading capability and encapsulation efficiency of the SUVs. The permeability of the lipid membrane to small molecules was also evaluated using second harmonic generation spectroscopy analysis. The different effects of the ILs with increasing chain length imposed on the membranes were compared and analyzed.
研究领域:
生物物理学
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2014
·
IF 4.384
Zheng Wang,Ting Yu,Pei Nian,Qingchun Zhang,Junkang Yao,Shan Li,Zuoning Gao,Xianglong Yue
sec-Butanol-modified rounded-coffin-shaped silicalite-1 (SL) microcrystals were assembled into a compact and highly b-oriented monolayer extending over the centimeter scale via the Langmuir–Blodgett (LB) technique. For comparison, methanol- or ethanol-modified SL microcrystals could not float and were compressed into a dense film in an LB trough. Subsequently, highly b-oriented MFI films with a thickness of ∼1.5 μm were successfully obtained on the solid substrates by secondary growth of the LB monolayer using tetrapropylammonium hydroxide (TPAOH) as the structure-directing agent. The electrochemical experiments confirmed that the prepared films were defect-free. In general, the LB method is a highly controllable and reproducible method of organizing anisotropic zeolite crystals with a preferred orientation over a relatively large surface area. The LB technique could be further applied as an effective platform for the oriented assembly of different types of zeolite particles and the growth of variously oriented zeolite films.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Lian-Kui Wu,Hao Wu,Zheng-Zheng Liu,Hua-Zhen Cao,Guang-Ya Hou,Yi-Ping Tang,Guo-Qu Zheng
A novel copper ferrite foam fabricated on Fe-Ni foam substrate was synthesized via a simple hydrothermal method to efficiently remove arsenic from aqueous solution. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-Ray diffraction pattern (XRD) and Raman spectra were used to characterize the morphology and surface composition of the copper ferrite foam (CFF). The adsorption behavior of As(III) and As(V) onto this CFF is studied as a function of solution pH, temperature, contact time, and different concentrations. Results shown that this CFF has high adsorption capacity and excellent recyclability . Adsorption isotherms study indicates Langmuir model of adsorption. The maximum adsorption capability of As(III) and As(V) on CuFe 2 O 4 foam is observed about 44.0 mg g −1 and 85.4 mg g −1 , respectively. Regeneration experiment indicates that arsenic could be easily desorbed from CFF with 0.10 mol L −1 NaOH and the high adsorption capacity can be maintained for six regeneration cycle.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xueli Zhang,Yan Sun,Wei Su,Xueyuan Wang
As a new kind of adsorbent, graphene sheets (GS) possess large surface areas and excellent adsorption properties. To investigate the adsorption equilibria of C1–C4 from natural gas on GS and fit the isotherms by the Langmuir–Freundlich equation. GS were synthesized with a specific surface area of 805 m2/g and a specific pore volume of 1.03 cm3/g. The adsorption isotherms were measured using a volumetric method at five different temperatures between 263.15 and 303.15 K and at pressures of 0–6 MPa for CH4, 0–1.6 MPa for C2H6, 0–0.3 MPa for C3H8, and 0–0.05 MPa for C4H10. It was shown that, for all four hydrocarbons, the amount of adsorption decreased gradually as the temperature increased. The isotherms were described well by the Langmuir–Freundlich equation. The isosteric heat of adsorption values decreased in the order C4H10 > C3H8 > C2H6 > CH4 which was consistent with those of the extreme heats of adsorption. This suggests that the adsorption capacities of C1–C4 on GS decreased in the order C4H10 > C3H8 > C2H6 > CH4.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Tang Yu,Li Jiale,Li Yanfang,Ran Pan,Zou Weixin,Yan Shicheng,Dong Lin
Achieving stable and selective electrocatalytic nitrate reduction (NO 3 RR) at high current densities demands a fundamental understanding of the hydrogenation mechanism. We demonstrate that alloying cobalt with ruthenium (RuCo) switches the dominant hydrogenation pathway from the Eley-Rideal (E-R) mechanism, involving solvated protons, to the Langmuir-Hinshelwood (L-H) mechanism, utilizing adsorbed protons. Microkinetic modeling, in situ spectroscopy and density functional theory (DFT) calculations reveal that the competitive E-R pathway on pure Co causes sluggish hydrogenation kinetics and low Faradaic efficiency. In contrast, the L-H pathway on RuCo sustains high hydrogen coverage ( θ H ≈ 0.45), enabling efficient hydrogen-atom transfer for high-rate and deep hydrogenation. Leveraging this mechanistic insight, we achieve a satisfactory ammonia yield rate of 135.53 ± 1.18 mg h −1 cm −2 with 100% Faradaic efficiency and robust 1000-h stability at 1 A cm⁻². This work provides critical understanding of electrochemical hydrogenation pathways for designing efficient catalysts operating under industrially relevant conditions.
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Pengfei Bian,Xinyu Li,Lexin Zhang,Guiying Qiao,Lukang Ji,Tifeng Jiao
Self-assembly of chiral molecules combining multifunctional thin film materials has been increasingly emphasized by researchers. In this work, amphiphilic glutamine-cyanostilbene-based molecules organic molecules and dye molecules composite LB films were designed and prepared by supramolecular self-assembly in LB technology. Characterization by AFM and transmission electron microscopy confirmed that the composite films exhibit nanoscale surface homogeneity. UV spectroscopy and circular dichroism spectroscopy analyses show that the prepared LB films have J-type aggregation state and the chiral centers achieve effective chiral transfer during supramolecular assembly. Photoelectrochemical tests show that all the film properties exhibit excellent photocurrent density and charge separation efficiency, which provides a theoretical model for the design of flexible optoelectronic devices and an idea for the application of chiral supramolecular materials in the field of optoelectronic sensing and energy conversion.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Chao-Yu Wang,Bai-Chen Liu,Tao Tu,Bo Tu,Dong-Jin Qian
Molecular structure, external stimuli, and environmental factors all have a strong effect on the internal molecular rotation and vibration of aggregate-induced emission (AIE) luminogens. Here, we report the AIE effect for several newly synthesized amphiphilic tetra(benzimidazole)phenylethene (TBiPE) derivatives and their binuclear N-heterocyclic carbene silver (NHC-Ag) metallacycles in solutions, aggregates, and Langmuir–Blodgett (LB) films. Monolayer behaviors and microscopic images indicate that introducing alkyl chains and binuclear NHC-Ag metallacycles can facilitate the formation of a well-defined insoluble monomolecular layer at the air–water interface. Absorption and luminescence spectral features suggest that both the TBiPEs’ cyclization structure and binuclear NHC-Ag metallacycles can provide additional driving forces to restrict the internal molecular motion of the tetraphenylethene (TPE) unit, thus enhancing the AIE effects. Further, external stimuli and environmental factors such as poor solvent addition and LB film deposition also play important roles in the photoluminescent intensity, maximum wavelength, and lifetime. These internal and external factors can result in around 30–40 nm blue-shift for the maximum luminescence wavelength and 2–3 times shorter for the luminescent lifetime. These phenomena can be attributed to the reason that the nonradiative energy transfer efficiency is weakened because of the enhanced hydrophobic interaction and metal–carbene coordination as well as the closely packed arrangement of AIEgens in the LB films; consequently, the radiation energy transfer efficiency increased.
研究领域:
材料科学
·
物理化学
·
光化学
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yingfan Guo,Nan Zhang,Huiqin Yang,Guorui Zhang,Xinmiao Xie,Yanzhe Wang,Huali Nie,Xiaoxia Wang
To overcome the pervasive trade-off between permeability and selectivity in membrane separation, this study developed a loose nanofiltration membrane operable at low pressure by constructing ordered graphene oxide (GO) nanochannels via Langmuir–Blodgett self-assembly. This technique enables precise layer-by-layer deposition of GO monolayers onto a highly porous electrospun polyacrylonitrile nanofibrous substrate, forming an ultrathin selective layer that achieves high-efficiency separation under low operating pressure. By tuning the number of deposited GO layers, the separation performance can be systematically regulated: as the layer count increases, the rejection of dyes such as Congo Red and Methylene Blue rises significantly, reaching 85–90% for the four-layer GO membrane. In salt separation, the membrane attains a Na₂SO₄ rejection of approximately 80%, with the rejection order following Na₂SO₄ > MgSO₄ > NaCl > MgCl₂, which is attributed to the synergistic effect of size sieving and Donnan exclusion. Furthermore, the GO-coated membrane exhibits enhanced antifouling performance, characterized by high flux recovery and low irreversible fouling. This work not only provides a high-performance loose nanofiltration membrane for dye/salt separation, but also offers a scalable strategy for fabricating precisely structured two-dimensional nanochannel membranes, demonstrating promising potential for wastewater treatment and resource recovery.
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产品关联
DOI
高影响因子
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