COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuqi Zheng,Yang Jin,Nan Zhang,Dong Wang,Yang Yang,Meng Zhang,Guohui Wang,Wenjuan Qu,Yuting Wu
MXene as a new member of 2D materials due to its metallic conductivity, rigid structure, hydrophilicity and functionalization has received extensive interests in the field of ion exchange membranes . Herein, different mass fractions of Ti 3 C 2 T X MXene were mixed into polyvinylidene fluoride (PVDF) by blending method to obtain cation exchange membranes (CEMs), and the electrodialysis (ED) properties of these membranes were characterized to determine the possibility of their application. With the addition of MXene, the anti-fouling ability of the membrane was effectively improved and the membrane resistance was reduced, and the overall performance reached the best when the content of MXene was 3%wt. The ED process results showed that the modified CEMs can reduce the energy consumption and improve the mass transfer capacity, and 3%wt MXene/PVDF CEM had better performance than other prepared CEMs. Furthermore, the improvement of mechanical and thermal stability of these membranes were attributed to the formation of strong interaction between PVDF and MXene. The preparation strategy of MXene/PVDF CEMs provides basic information for the rational design of separation membrane with high comprehensive performance and opens up a good prospect for the application of MXene in the field of electrodialysis.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 6
·820
·
IF 3.236
Andong Wang,Jianhua Liu,Chenkang Shao,Youming Zhang,Caifeng Chen
Polyvinylidene fluoride (PVDF) films are widely used in sensors for their wide response frequency, good flexibility, low acoustic impedance, and chemical stability. In this work, PVDF/CaCl2piezoelectric films were prepared by an electro-assisted 3D printing method and used to form a multi-layer composite film sensor. The study found that the addition of CaCl2can effectively increase theβ-phase content in the PVDF film and improve the piezoelectric and dielectric properties of the PVDF composite film sensors. When the content of CaCl2is 0.15 wt.%, theβ-phase content of the PVDF/CaCl2composite film can reach the highest value of up to 48.47%, and the output voltage response of the sensor is 0.62 V at an input frequency of 10 Hz, 10 V voltage. The output voltage of PVDF composite film sensor with two and three layers is 1.306 and 1.693 times that of a single layer, respectively. The sensitivity of the multi-layer sensors has also been greatly improved.Keywords:3D printing;film;composite;sensor
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Juan Yi,Yiheng Song,Zhilong Cao,Chenjian Li,Chuanxi Xiong
With the demand of green energy upsurging, piezoelectric nanogenerators (PENGs) are booming for next generation of wearable energy supply. In this work, Y-doped ZnO was manufactured with yield of ~3.2 g (~74%) in one pot, and PVDF/Y-doped ZnO electrospun films was fabricated with flexibility of PVDF and high piezoelectricity of Y-doped ZnO (Y–ZnO). Among all electrospun films, the degree of dipole orientation of PVDF and the contents of Y-doped ZnO in 15 Y-Z films is uppermost except for agglomerated 20 Y-Z electrospun film. Increasing amounts of Y–ZnO and enhanced alignment degree of PVDF cause increased piezoelectric output. When walking or running on 15 Y-Z PENG, output voltage raised to ~20 V and ~35 V, and capacitor of 5 μF was charged to ~2.8 V and ~3.7 V in 50 s. For 15 Y-Z PENG with high F(β) of 98%, its output voltage and current increased to ~13 V and ~1.6 μA, and its maximum instantaneous power density (~2 μW/cm 2 ) was obtained with load of 10 MΩ at 40 N and 0.8 Hz. In addition, 15 Y-Z PENG can withstand compressing and releasing for 1100 s at 0.8 Hz. Such brilliant performance earns gigantic prospect of application on collecting teeny-weeny energy.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Fangwei Qi,Xiuwen Gao,Shuping Peng,Wenjing Yang,Guowen Qian,Sheng Yang,Cijun Shuai
Piezoelectric polyvinylidene fluoride (PVDF) provided an opportunity for non-invasive in situ electrical stimulation of cell behavior, yet its electroactive β phase was difficult to obtain due to its instability in the molten state. Herein, polyaniline (PANI) protrusions were in situ oxidation-polymerized on molybdenum disulfide (MoS2) nanosheets (PANI-MoS2). Then, PANI-MoS2 was introduced into laser additive-manufactured PVDF scaffolds. On the one hand, PANI protrusions produced steric hindrance between adjacent MoS2 nanosheets and inhibited the stacking and aggregating of MoS2. On the other hand, PANI-MoS2 could serve as a platform to achieve interfacial polarization locking. Specifically, Mo–S dipoles in MoS2 and π electron clouds over the N atom in PANI locked −CH2 dipoles in PVDF through electrostatic and hydrogen bond interactions, respectively, which forced −CH2 to align perpendicularly to the basal plane of MoS2 and bialy to one side of the PVDF main chain, thereby forming a full-reverse planar zigzag configuration of the polarized β phase and maintaining its stable existence. The results demonstrated that the β phase of the scaffolds was significantly increased from 43 to 90%, which resulted in an enhanced electrical output performance. The improved electrical output greatly promoted osteoblast-like cell proliferation and differentiation. Furthermore, owing to the pulling-out effect of MoS2 and improved interfacial stress transfer between MoS2 and the polymer matrix, the mechanical properties of scaffolds were also enhanced. These findings suggested that the piezoelectric scaffolds had great potential in bone tissue engineering.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 50
·505204
·
IF 3.874
Yuanzhen Du,Dawei Cao,Yuan Liu,Quan Wang
Adding conductive graphene into polyvinyliden1 fluoride (PVDF) is an effective method to improve the dielectric properties. However, the high conductivity and uniform distribution of graphene in PVDF matrix still meet challenges. In this work, electrochemical exfoliated graphite (EEG) with good conductivity and solution dispersion is used to prepare PVDF/EEG films. By this method no specific conditions are needed such as reduction or hot press. The dielectric properties and flexibility of PVDF/EEG films of different concentrations of EEG are investigated. Especially, when EEG content is 2.6 wt%, composite film has a high dielectric constant of 86 and a low dielectric loss of 0.9 (100 Hz). Simultaneously, the tensile strength of the film was up to 55.1 MPa. The preparation method is simple and convenient, and the obtained material has high dielectric constant and tensile strength. This method paves the way for the application of flexible electronic sensing equipment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Lingli Liu,Tongwei Xu,Xuefeng Gui,Shuxi Gao,Longfeng Sun,Qiong Lin,Xuan Song,Zhongxin Wang,Kai Xu
Microporous electrospun membranes have certain advantages of higher porosities and electrolyte wettability owing to their high specific surface areas, but these materials suffer from insufficient mechanical strength and dimensional stability when they are employed in advanced lithium batteries . In order to improve the material characteristics and electrochemical performance of these materials, we report the fabrication of silsesquioxane modified electrospun hybrid poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF(HFP)) membranes via the combination of concurrent electrospinning/electrospraying techniques and a UV-initiated grafting polymerization method. The fabricated electrospun hybrid membranes were systematically characterized via various techniques, including thermal characterization, morphology observation, dimensional and mechanical property tests, as well as electrochemical measurements. Silsesquioxanes were covalently integrated onto the surface of electrospun fibers to obtain rigid sheath-like hybrid shell architectures and enhanced cross-linked networks, thus imparting these electrospun hybrid membranes with superior mechanical properties , thermal and dimensional stabilities, as well as remarkable electrochemical performance. Through an in-depth investigation into the electrochemical performance differential of separator prepared by different molecular-topological silsesquioxanes, we discovered that octa-silsesquioxanes (SQ-T 8 ) decorated separators offered superior cycling performance while deca-silsesquioxanes (SQ-T 10 ) exhibited a higher capacity. Through these investigations, we hypothesized that SQ-T 8 and SQ-T 10 assembled into different configurations via intermolecular stacking arrangements as they were grafted onto electrospun fibers. On the basis of these promising results, these electrospun hybrid membranes could find practical applications in advanced lithium batteries.
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Kunming Shi,Bin Chai,Haiyang Zou,Peiyue Shen,Bin Sun,Pingkai Jiang,Zhiwen Shi,Xingyi Huang
Nanocomposites consisting of a flexible piezoelectric polymer and a reinforcing phase have shown great potential for constructing high-performance piezoelectric nanogenerators (PENGs). However, the weak interface and poor dispersion of piezoelectric reinforcing phase significantly impair the electromechanical properties (e.g. , effective stress/strain, piezoelectric coefficients) of the nanocomposites, thus severely restricting the performance enhancement of the PENGs. In this study, we hydrothermally synthesized the piezoelectric reinforcing phase of BaTiO 3 nanowires , and grafted a layer of high-modulus polymethyl methacrylate (PMMA) onto the nanowire surface via surface-initiated polymerization. The PMMA coating layer forms a strong interface between BaTiO 3 nanowires and the polymer matrix [i.e ., poly(vinylidenefluoride-co-trifluoroethylene)], which efficiently improves dispersion of the BaTiO 3 nanowires and stress transfer at the interface, therefore resulting in an enhanced output performance in the fibrous nanocomposite PENGs. The output voltage and current of the PMMA encapsulated BaTiO 3 (PMMA@BaTiO 3 ) nanowires-based PENG can reach to 12.6 V and 1.30 μA, with a maximum output power of 4.25 μW, which is 2.2 times and 7.6 times higher than the PENG with unmodified BaTiO 3 nanowires and the PENG without BaTiO 3 nanowires, respectively. Furthermore, the flexible PENG exhibits great stability that could continuously generate stable electrical pulses for 6000 cycles without any decline. This study provides a feasible approach of interface tailoring for achieving high-performance piezoelectric nanocomposite and shows the promising potential of the fibrous nanocomposites in biomechanical energy harvesters and smart wearable sensors.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-14
·
IF 3.998
Xu JingJing,Fu Chao,Chu Huiying,Wu Xianyou,Tan Zhongyang,Qian Jing,Li Weiyan,Song Zhongqian,Ran Xianghai,Nie Wei
In recent years, high energy density polymer capacitors have attracted a lot of scientific interest due to their potential applications in advanced power systems and electronic devices. Here, core–shell structured TiO 2 @SrTiO 3 @polydamine nanowires (TiO 2 @SrTiO 3 @PDA NWs) were synthesized via a combination of surface conversion reaction and in-situ polymerization method, and then incorporated into the poly(vinylidene fluoride) (PVDF) matrix. Our results showed that a small amount of TiO 2 @SrTiO 3 @PDA NWs can simultaneously enhance the breakdown strength and electric displacement of nanocomposite (NC) films, resulting in improved energy storage capability. The 5 wt% TiO 2 @SrTiO 3 @PDA NWs/PVDF NC demonstrates 1.72 times higher maximum discharge energy density compared to pristine PVDF (10.34 J/cm 3 at 198 MV/m vs. 6.01 J/cm 3 at 170 MV/m). In addition, the NC with 5 wt% TiO 2 @SrTiO 3 @PDA NWs also demonstrates an excellent charge–discharge efficiency (69% at 198 MV/m). Enhanced energy storage performance is due to hierarchical interfacial polarization among their multiple interfaces, the large aspect ratio as well as surface modification of the TiO 2 @SrTiO 3 NWs. The results of this study provide guidelines and a foundation for the preparation of the polymer NCs with an outstanding discharge energy density.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Xing Long,Ya-Shuo Chen,Qian Zheng,Xing-Xiao Xie,Hao Tang,Li-Ping Jiang,Juan-Tao Jiang,Jian-Hua Qiu
Metal-organic frameworks (MOFs) are capable in capture and storage of iodine ions with high efficiency, and polymer/MOF nanocomposite membrane has the potential to be used for efficient removal of iodine from radioactive wastewater. In this work, we have reported a PVDF/ZIF-8 nanocomposite adsorption membrane prepared by contra-diffusion method. The combination of surface graft of poly(4-vinylpyridien) brushes and optimal addition of sodium formate into ligand contributes to the formation of a well-intergrown and continuous ZIF-8 layer on the metal ions side surface of PVDF- g -P4VP membrane. In the batch adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits high affinity for iodine following a pseudo-second-order kinetics and fitting the Freundlich isotherm model with a maximum adsorption capacity of 73.33 mg/g. In the dynamic adsorption, the PVDF/ZIF-8 nanocomposite membrane exhibits a high flux of 66.19 L/(m 2 ⋅h⋅MPa) and an iodine removal efficiency of 73% until 180 min. Initial iodine concentration has a little influence on the iodine removal efficiency, but solution pH shows a significant effect. The iodine removal efficiency can be maintained around 92% in a weakly alkaline medium of pH = 8. The PVDF/ZIF-8 nanocomposite membrane possesses an excellent reusability with an iodine removal efficiency of 73.4% after five cycles.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Shengyang Zhou,Hongjian Zhang,Changzhou Du,Ming Liu,Liming Liu,Yong Zhang
Polymer-based piezoelectric composites have shown a large potential in various fields of wearable electronics, man–machine interaction, transducers, etc., due to their integrated advantages of high piezoelectric properties, benign flexibility, and pressure sensitivity. As the representative polymer matrix in piezoelectric composites, polyvinylidene fluoride (PVDF) is characterized by its intrinsic piezoelectric response induced via the existence of ferroelectric β and γ phases. However, the most stable phase at ambient temperature and pressure is the nonpolar and paraelectric α phase, which serves as a long-standing issue. Herein, chitosan was introduced into the PVDF matrix to promote the transition from α phase to β phase via the interaction between the –OH and –NH2 groups in chitosan and the H and F atoms in PVDF. As evidenced, the portion of the β phase increased from 47.9 to 63.7%. An electrospinning technique was adopted to prepare PVDF/chitosan composites with a chitosan content ranging from 1 to 4 wt %, and the correlation between structural characteristics and piezoelectric properties is illustrated in detail. Then, a flexible pressure sensor based on PVDF/chitosan composite was prepared, which presents a low detection limit of ∼220 Pa in a wide range of 220 Pa–81 kPa. The pressure sensor presents a good capability for detecting pulse signals and speech recognition accurately. As well demonstrated in this work, the treatment of PVDF with low-cost chitosan may boost its practical application in future flexible electronics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 4
·45746
·
IF 1.86
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Changhong Lin,Yan Zhou,Yuming Yang
Polydopamine (PDA) layers and particles self-polymerized by dopamine have ultraviolet (UV) absorbing property besides versatility and adhesive ability. Herein, a facile strategy for preparing poly(vinylidene fluoride) (PVDF) membrane coated with a thick PDA layer was developed to decrease UV transmittance through the surface modification of PVDF membrane. The PVDF membrane was modified by PDA deposition after pretreated with KOH/alcohol and KMnO 4 /KOH solution. Furthermore, we investigated the effect of coating conditions such as concentration of dopamine and Tris–HCl buffer solution, coating time, and temperature on the performance of membranes. The characterization results indicated that it is more conductive for PDA deposition on the surface PVDF-OH films than original PVDF films. Most importantly, UV transmittance of PVDF-OH film modified in dopamine solution under optimum condition for one time can decrease to as low as 0.122% at 320 nm, which showed excellent UV-shielding property. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45746.
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Yan-Fang Guan,Bao-Cheng Huang,Chen Qian,Long-Fei Wang,Han-Qing Yu
Polyvinylidene fluoride (PVDF) membrane has been widely applied in water and wastewater treatment because of its high mechanical strength, thermal stability and chemical resistance. However, the hydrophobic nature of PVDF membrane makes it readily fouled, substantially reducing water flux and overall membrane rejection ability. In this work, an in-situ blending modifier, i.e., extracellular polymeric substances (EPS) from activated sludge , was used to enhance the anti-fouling ability of PVDF membrane. Results indicate that the pure water flux of the membrane and its anti-fouling performance were substantially improved by blending 8% EPS into the membrane. By introducing EPS, the membrane hydrophilicity was increased and the cross section morphology was changed when it interacted with polyvinl pyrrolidone, resulting in the formation of large cavities below the finger-like pores. In addition, the fraction of pores with a size of 100–500 nm increased, which was also beneficial to improving membrane performance. Surface thermodynamic calculations indicate the EPS-functionalized membrane had a higher cohesion free energy, implying its good pollutant rejection and anti-fouling ability. This work provides a simple, efficient and cost-effective method to improve membrane performance and also extends the applications of EPS.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）