Xian Xu

Donghua University

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Zongyi Qin

Donghua University

Yueying Shen

Donghua University

Shuguang Yang

Sun Yat-sen University

Weijie Wang

Yibin University

Yu Shao

Peking University

Lifeng Yang

Zhejiang University

Hao Liu

Donghua University

Bowen Cheng

Tianjin University of Science and Technology

Wenbin Zhang

Peking University

Liao Jian-wen

Third Affiliated Hospital of Southern Medical University

Cooperative Institutions

Donghua University

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials

Tianjin Polytechnic University

Chinese Academy of Sciences

Shandong University

Materials Science & Engineering

Peking University

Beijing National Laboratory for Molecular Sciences

South China University of Technology

Zhejiang University

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Interfacial Behaviors of Giant Amphiphilic Molecules Composed of Hydrophobic Isobutyl POSS and Hydrophilic POSS Bearing Carboxylic Acid Groups at the Air–Water Interface

Langmuir (2023)

Weijie Wang Xian Xu Fengfeng Feng Yu Shao Hanxin Jian

The behavior of giant amphiphilic molecules at the air-water interface has become a subject of concern to researchers. Small changes in the molecular structure can cause obvious differences in the molecular arrangement and interfacial properties of the monolayer. In this study, we have systematically investigated the interfacial behaviors of the giant amphiphilic molecules with different number of hydrophobic BPOSS blocks and one hydrophilic ACPOSS block ((BPOSS)n-ACPOSS (n = 1-5)) at the air-water interface by the surface pressure-area (π-A) isotherm, Brewster angle microscopy (BAM), compression modulus measurement, and hysteresis measurement. We found that both the number of BPOSS blocks and the compression rate can significantly influence the interfacial behaviors of giant molecules. The π-A isotherms of giant molecules (BPOSS)n-ACPOSS (n = 2-5) exhibit a "cusp" phenomenon which can be attributed to the transition from monolayer to multilayer. However, the cusp is dramatically different from the "collapse" of the monolayer studied in other molecular systems, which is highly dependent on the compression rate of the monolayer. In addition, the compression modulus and hysteresis measurements reveal that the number of BPOSS blocks of (BPOSS)n-ACPOSS plays an important role in the static elasticity, stability, and reversibility of the Langmuir films.

Surface pressure

Brewster's angle

Hysteresis

10.1021/acs.langmuir.3c02378

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Citations (4)

Room-temperature ferromagnetism enhancement in Fe-doped VSe2 nanosheets synthesized by a chemical method

Rare Metals (2021)

Liyan Hu Lifang Yu Huan Yang Xian Xu Fang Wang

Hysteresis

10.1007/s12598-021-01740-1

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Citations (11)

Polyaniline nanofibers formed by seed polymerization through heat treatment for synergistic enhancement of Cr(VI) removal

Materials Letters (2019)

Tao Li Zongyi Qin Yueying Shen Xian Xu Na Liu

Hexavalent Chromium

Polyaniline nanofibers

Specific surface area

Morphology

10.1016/j.matlet.2019.05.128

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Citations (13)

In-situ hybridization of graphene sheets onto polyaniline nanofiber arrays grown on the surface of carbon cloth under high electric voltage field for high–performance flexible supercapacitor

Carbon (2019)

Yueying Shen Zongyi Qin Shuo Hu Lifeng Yang Xian Xu

10.1016/j.carbon.2019.11.045

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Citations (59)

Seed polymerization and capacitive performances of polyaniline nanofibers

MATEC Web of Conferences (2022)

Xian Xu Zongyi Qin

Polyaniline (PANI) nanofibers have great potential application as a lightweight and high-performance pseudocapacitive material for supercapacitors. In this work, aniline oligomers as the seeds are produced in weak acidic solution of phosphoric acid through dilution polymerization, then these seeds were used to promote the grow of PANI nanofibers in the condition of hydrochloric strong acidic by adding more aniline monomers again. The microstructure and capacitance performances of PANI nanofibers were investigated by SEM, FT-IR, XRD and electrochemical measurements. When the current density is 1 A g -1 , the specific capacitance could be as high as 442.9 F g -1 . This work provides a route for the simple and efficient preparation of electrode materials with excellent performance.

Polyaniline nanofibers

Phosphoric acid

10.1051/matecconf/202235601003

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Citations (1)

Phase Behaviors of Giant Surfactants with Different Numbers of Fluorinated Polyhedral Oligomeric Silsesquioxane “Heads” and One Poly(ethylene oxide) “Tail” at the Air–Water Interface

Langmuir (2021)

Xian Xu Yu Shao Weijie Wang Liao Jian-wen Hao Liu

Giant surfactants with different numbers of aryl-trifluorovinyl ether-functionalized polyhedral oligomeric silsesquioxane (FVPOSS) heads and one poly(ethylene oxide) (PEO) tail, (FVPOSS)n–PEO227, are precisely synthesized. The phase behaviors of (FVPOSS)n–PEO227 at the air–water interface were investigated through surface pressure measurements (isotherm and hysteresis experiments) and the Brewster angle microscopy. Upon increasing the number of FVPOSS heads, the interfacial behaviors of these giant surfactants greatly change. More phase transitions occur during the compression as the number of FVPOSS heads increased from one to two and three. The evolution of morphologies of Langmuir films and compression–expansion hysteresis curves further illustrate phase transitions at the air–water interface. Furthermore, molecular mechanisms to describe phase transitions of (FVPOSS)n–PEO227 at the interface are put forward. This study deepens the understanding of interfacial phase behaviors of special giant surfactants and provides knowledge of nanostructure design and construction at the interface.

Silsesquioxane

Hysteresis

10.1021/acs.langmuir.1c01777

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Citations (6)

Synthesis and self-assembly of chitosan-based copolymer with a pair of hydrophobic/hydrophilic grafts of polycaprolactone and poly(ethylene glycol)

Carbohydrate Polymers (2008)

Li Liu Xian Xu Shengrong Guo Wei Han

Polycaprolactone

10.1016/j.carbpol.2008.07.038

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Citations (43)

The Antistatic Research of Polyester/Nylon Fabrics Finished by Triblock Copolymer Containing Organic Silicon

Advanced materials research (2012)

Tao Wang Xian Xu Xiao Yang Sui Li Na Wang

Polyester/nylon blend fabric has some advantages, such as high strength, excellent drapability, but the biggest drawback of the blend fabric is the easily formed electrostatic. In this paper, the blend fabric was finished with the triblock copolymer containing organic silicon to improve the antistatic property of the fabric. The influence of the concentration of the finishing agent on the antistatic property was studied emphasisly. And the effect of antistatic, the feeling and the color fastness were analyzed. The results show that the finishing agent of triblock copolymer containing hydrophilic organosilicon with the concentration of 15 g/L can make the fabric achieve the best antistatic effect, the best feeling and the fabric color fastness is less affected.

Antistatic agent

Organosilicon

10.4028/www.scientific.net/amr.535-537.1569

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Citations (0)

Syntheses and Investigation of Properties of New Ionic Liquids Thiazolium Halogenide

Advanced materials research (2011)

Qing Kai Wang Hong Jun Zang Fang Yang Bowen Cheng Yuan Lin Ren

A series of novel thiazolium halogenide ionic liquids were synthesized by using 4-methylthiazole or 4-methyl-5-thiazoleethanol and halohydrocarbons as materials. The compounds were characterized and analyzed by elemental analysis, 1H NMR and DSC.The solubilities of the ionic liquids in organic dissolvents were observed, meanwhile the conductivities and melting points were measured. The results show that these ionic liquids have high conductivity in water and have good solubility in traditional polar solvents, such as H2O, ethanol and acetonitrile. And the thiazolium halogenide are room temperature ionic liquids, due to their low melting points.

10.4028/www.scientific.net/amr.332-334.2036

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Citations (2)

One-Pot Syntheses of 2H-Indazolo[2,1-B] Phthalazine-Triones Catalyzed by Ionic Iiquid

Advanced materials research (2011)

Fang Yang Hong Jun Zang Qing Kai Wang Bowen Cheng Yuan Lin Ren

A simple and efficient one-pot method for the preparation of 2H-indazolo [2,1-b] phthalazine-triones from phthalhydrazide, dimedone and aromatic aldehydes has been developed using ionic liquids as catalysts. Two ionic liquid catalysts are described, and the ionic liquid [(CH2)4SO3HMIM]HSO4 catalyst is found to be more effective than [HMIM]HSO4 for this condensation reaction.

Phthalazine

Dimedone

Condensation reaction

10.4028/www.scientific.net/amr.332-334.1884

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Citations (2)