COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xiujuan Liu,Na Li,Tianyue Zhao,Qing Li,Zihe Lu,Ze Chen,Bo Feng,Tifeng Jiao
The Langmuir-Blodgett (LB) technique can be used to obtain highly ordered arrangement and assembly of high polymer molecular chains , and the obtained LB films exhibit the controllable structures and special physicochemical properties . Here, we successfully prepared the composite LB films based on bisphenol fluorene (BPF) and epoxy bisphenol fluorene (DGPF) by LB technique, as well as explored the microstructures of the composite LB films by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The different aggregation states of various dye molecules in the composite LB films are investigated by UV–vis. Interestingly, the composite LB film electrodes exhibit promising photoelectrochemical properties. In particular, BPF/MB and DGPF/MB LB films show better photoelectric conversion efficiency. It is attributed to the ordered arrangement of BPF and DGPF and their effective aggregation with dye molecules, which improves the light absorption ability and charge transfer efficiency of the materials. Therefore, the prepared LB films based on the synthetic polymers BPF and DGPF are expected to play an important role in microelectronics.
研究领域:
材料科学
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物理化学
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微电子学
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DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 18
·1514
·
IF 4.4
Feifei Wang,Lei Ge,Lin Li,Tianyue Zhao,Tifeng Jiao
The LB films prepared through the Langmuir–Blodgett (LB) technique are of significant importance for the fabrication of functional films such as optoelectronic materials and sensors. In this study, 9,9-bis (4-(2-hydroxy-ethoxy) phenyl) fluorene (BPEF) and 9,9-bis [3-phenyl-4-(β-hydroxy-ethoxy) phenyl] fluorene (BBPEF) were combined with saffron T (ST), methylene blue (MB) and Rhodamine B (RhB) dyes by LB technique to prepare ordered composite films. The nanostructures and morphologies of the composite films were analyzed by transmission electron microscopy (TEM) and atomic force microscopy (AFM). It was found that the films exhibited distinct aggregation morphologies. The UV-VIS absorption spectra showed that the concentration of dye molecules had a significant effect on the spectral characteristics. The contact Angle test shows that the prepared composite films are hydrophobic. The photovoltaic conversion performance of LB composite films was studied by transient photocurrent response experiments. It was found that BPEF/dye and BBPEF/dye composite films exhibited significant responses in photocurrent. In particular, BPEF/RhB and BBPEF/RhB composite films demonstrated excellent photoresponsive performance. This study used LB technology in combination with BPEF and BBPEF to demonstrate enhanced photocurrent and stable performance of LB film, which provided ideas for expanding the application range of materials.
研究领域:
材料科学
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光电材料
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DOI
PubMed
高影响因子
LANGMUIR
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2013
·
IF 4.187
Yudi Guo,Dongyan Tang,Yunchen Du,Binbin Liu
We describe a controllable method to fabricate hexagonally close-packed Langmuir–Blodgett (LB) monolayers with stearic acid (SA) as co-surfactant and methanol as co-solvent. The optimal SA concentrations and volume ratios of chloroform to methanol are 0.8 mg/mL and 3:1 for particles of 140 nm, 0.50 mg/mL and 4:1 for particles of 300 nm, and 0.05 mg/mL and 5:1 for particles of 550 nm, respectively. Additionally, SEM detections of the monolayers transferred at different surface pressures indicate that the monolayers deposited from the binary systems are more compressible. The experimental results indicate that the interparticle repulsions and particle–water interactions can be enhanced without decreasing the particle hydrophobicity by adding SA and methanol; thus, particulate monolayers with large hexagonally close-packed domains composed of small silica particles can be successfully fabricated using LB technique. We propose that the enhanced interparticle repulsion is attributed to the Columbic repulsion resulting from the attachment of SA molecules to the CTAB modified particles around the three phase contact line.
研究领域:
材料科学
·
表面化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Pengfei Bian,Na Li,Guohua Li,Senlin Zhang,Xiujuan Liu,Jianmin Gu,Bo Liu,Tifeng Jiao
The development of multifunctional film materials from novel organic small molecules has attracted the attention of researchers. In this study, novel carbazole organic molecules (CS-14, CS-38 and CS-39) were successfully composited with TsNiPc and TPPS subphases into multilayer films by LB technology. The nanostructure and morphology of the composite films were successfully assembled and analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). In addition, the stability of the composite film was proved by UV–vis spectroscopy and Fourier transform infrared spectroscopy . The results demonstrate that Langmuir films are transferred to the surface of substrates in different aggregated morphologies. In addition, the self-assembled LB film electrodes exhibit excellent photoelectrochemical performance. The photoelectric conversion of the multilayer films transferred to ITO (indium tin oxide) was tested, and CS-38/TsNiPc Langmuir film exhibits a stronger photoelectric conversion effect. The electrolysis reaction of LB films to water was also tested. Further analysis shows that the composite films with TsNiPc as the subphase all showed better catalytic performance than the composite films with TPPS as the subphase. Therefore, the prepared LB film has the potential to become an optoelectronic functional ultrathin film device.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Yongcun Song,Nan Wang,Li-ye Yang,Yang−guang Wang,Di Yu,Xiao-kun Ouyang
Metal–organic frameworks (MOFs) have received special attention from scientists owing to their excellent adsorption performance. However, the difficulty in separating MOFs from adsorbed metals following use has limited their application. A zeolitic imidazole-based MOF with broad applicability for sorption of Pb(II) is examined. In this work, a novel adsorbent employing ZIF-8/calcium alginate microparticles was prepared using sodium alginate and ZIF-8. This adsorbent was characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The performance of the ZIF-8@CA microparticles in adsorbing Pb(II) from a Pb(II) solution was investigated, and the impacts of the initial Pb(II) concentration, reaction time, pH, and reaction temperature on the reaction process were investigated. The results showed that ZIF-8@CA microparticles exhibited a maximum adsorption capacity of 1321.21 mg/g at pH 5 after 120 min, and the adsorption process was found to fit the Langmuir isotherm model (R2 = 0.9856) and the pseudo-second-order kinetic model (R2 = 0.9999). These results showed that the adsorption of Pb(II) was an endothermic process. The regeneration experiment with ZIF-8@CA revealed that the removal efficiency of Pb(II) was greater than 80% even after five cycles.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Zhichao Sun,Yunguo Liu,Yuanqing Huang,Xiaofei Tan,Guangming Zeng,Xinjiang Hu,Zhongzhu Yang
In this study, the removal of Cd 2+ and Pb 2+ from aqueous solutions was investigated using a novel chelating material. The first part described the synthesis of ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid dianhydride (EGTAD), mercerization treatment of ramie fiber (MRF), and the MRF was then reacted with EGTAD to prepare the new material (ERF). The obtained material was characterized by weight gain, SEM, FTIR, and elemental analysis. The results of FTIR and elemental analysis confirmed that ester bond, carboxyl and amine groups were introduced onto ERF. The adsorption capacity of metals on ERF was evaluated at different contact times, pH values, initial metal concentrations, and temperatures in the second part. The adsorption equilibrium was reached within 5 min for Cd 2+ and Pb 2+ . Adsorption isotherm could be well fitted by the Langmuir model, and the maximum adsorption capacities were 159.11 and 273.78 mg g −1 for Cd 2+ and Pb 2+ at 298 K, respectively. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. The molar ratio of adsorbed cation to grafted EGTA is close to 1.8:1, which confirmed that the adsorption was chemical process involving both surface chelation reaction and ion exchange. In addition, the absorbent was successfully regenerated using HCl and ultrasonic treatment.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2014
·Vol. 31
·期 9
·1608-1615
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IF 1.241
Liu Qian,Yang Bingchao,Zhang Lujie,Huang Ruihua
A multifunction adsorbent was synthesized by incorporating AC into CTS, and the ratio of AC to CTS was 1/1. The resultant was called activated carbon (AC)/chitosan (CTS) composite. The simultaneous adsorption of phenol and Cu 2+ from aqueous solution onto AC/CTS composite was investigated by a batch procedure. The adsorption processes for both Cu 2+ and phenol obeyed the pseudo second-order kinetic model. Phenol was prone to be adsorbed more quickly as compared with Cu 2+ when they coexisted in solution. The adsorption behavior of both phenol and Cu 2+ followed the Langmuir isotherm. The maximum adsorption capacities of phenol and Cu 2+ were 34.19 mg/g and 74.35 mg/g at 293 K, respectively. No obvious competitive adsorption existed between phenol and Cu 2+ .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Mengyue Zhu,Lei Guo,Zhongyi He,Riadh Marzouki,Renhui Zhang,Elyor Berdimurodov
N -doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
研究领域:
材料科学
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电化学
·
防腐蚀研究
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2016
·
IF 3.976
Siyang Li,Lin Du,Zhongming Wei,Wenxing Wang
Atmospheric aerosol particles composed of a mixture of organic and inorganic compounds are common and constitute an important fraction of air pollutants . In this study, the activities of common atmospheric inorganic ions (Ag + , Zn 2 + , Fe 3 + , Fe 2 + , Ca 2 + and Al 3 + ) and fatty acid molecules (stearic acid and arachidic acid) at air-aqueous interface were investigated by Langmuir methods and infrared reflection-absorption spectroscopy (IRRAS). In the presence of different inorganic ions , surface pressure-area isotherms of the Langmuir films showed compressed or expanded characteristics. IRRAS spectra confirmed that the existence of inorganic ions in the fatty acid monolayer changes the surface properties of aqueous-phase aerosols. Formation of different coordination types of carboxylates at the air-water interface alters the dissolution and partitioning behavior, which has significant influence of Raoult effect on nucleating cloud droplets . Our work displays the relationship between structure and surface properties for aqueous-phase aerosols and implies an efficient method for further understanding of their formation mechanism and potential atmospheric implications.
研究领域:
大气化学
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环境科学
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表面科学
·
气溶胶物理
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DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Runji Yang,Weiqing Guo,Qingxi Jin,Yaohua Xu,Feng Wei,Jiliang Zhang
Sensitive, selective and low-cost sensors for nitric oxide (NO) detection are significant due to its toxicity. This report investigates the tunable sensing behavior in chemiresistive NO sensors using α-Fe2O3 nanoparticles as sensing materials. The sensor exhibits a distinctive sensing characteristic with a reversible transition from p- to n-type sensing behavior, which is regulated by working temperature. The temperature-modulated (200–400 °C) and concentration-dependent (100–1000 ppm) p–n transition diagrams are constructed, while the gas sensing behaviors can be well described using a two-isotherm model based on Langmuir adsorption theory. Detailed reactions between NO and α-Fe2O3 at each temperature are proposed, and the corresponding activation energy is calculated. It is demonstrated that the p–n transition mechanism during NO detection is modulated by the dynamic variations in the α-Fe2O3–NO interaction. The p–n transition observed as a specific behavior in NO gas sensing can provide a novel approach to enhance the recognition capability for NO gas.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Bai-Chen Liu,Bo Tu,Dong-Jin Qian
Photoluminescence regulated by the Förster resonance energy transfer (FRET) process attracts much attention for the development of novel luminescent materials and devices. Here, an efficient FRET system has been designed and constructed with the use of aggregation-induced emission (AIE) units as the energy donor and sulforhodamine B (SRB) as the acceptor in the aggregates, mixed solid powders, and Langmuir–Blodgett (LB) films. Two amphiphilic tetraphenylethene derivatives with octyl chains (C8TPEs) are synthesized and used as AIEgens, which can form well-organized mixed monolayers with arachidic acid (AA) on the SRB subphase surfaces. Efficient photoinduced energy transfer is observed from AIEgens to SRB in the C8TPE/SRB powders and C8TPE-AA/SRB hybrid LB films, with the luminescent colors changing from green through yellow to orange. The differences in their FRET behaviors are interpreted in terms of the highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gaps, absorption spectra, and intramolecular charge transfer characteristics by time-dependent density functional theory calculations. It is further revealed that by controlling the SRB concentrations in the subphase, the luminescent emission wavelength for the C8TPE-AA/SRB hybrid LB films shifts from 490 to 592 nm, that is, from typical AIE to SRB emission. Therefore, this work provides a viable strategy for developing solid-state FRET systems by combining AIEgens’ donor with aggregation-caused quenching type acceptors, highlighting their potential in optoelectronic and sensing applications.
研究领域:
材料科学
·
光物理学
·
纳米科技
·
表面化学
·
分子光子学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Na Li,Ran Wang,Chongling Wang,Jing Gao,Zhiwei Liu,Jianmin Gu,Tifeng Jiao
The reasonable design of various functionalized nanocomposites based on black phosphorus (BP) has sparked substantial attention from researchers. In this work, the bulk BP was successfully exfoliated into nanosheets (BPNS), the polyethyleneimine (PEI) was selected as the surface protective layer to modify the BPNS for strengthening its stability. We have designed and synthesized two kinds of BPNS-PEI Langmuir composite films containing azobenzene compounds (BPNS-PEI/N-Azo and BPNS-PEI/PAA-Azo) by Langmuir–Blodgett (LB) technology. The composite films were successfully assembled and analyzed the nanoscale structure and morphology using transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM) and other different characterization methods. In addition, the BPNS-PEI/N-Azo composite films were proven to demonstrate the photoisomerization stability and the acid-alkali atmosphere gas responsiveness by ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy . Furthermore, the photoelectrochemistry performances of the acquired LB composite films were studied by transferring multilayer films on indium tin oxide (ITO) substrates. And the results demonstrated that the BPNS-PEI/N-Azo self-assembled LB film electrode showed higher photoelectric conversion efficiency. The self-assembled films based on BP, undertaking an appealing conception for gaining a wide range of nano-optical devices, gas sensors and optoelectronic devices.
研究领域:
材料科学
·
化学
·
纳米技术
·
光学工程
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产品关联
DOI
高影响因子
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