CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yushan Deng,Xi Ouyang,Manwen Yao,Xi Yao
Heterovalent ion doping has influenced the further development of piezoelectric applications. Pr 3+ doping in relaxor ferroelectrics is rarely focused on piezoelectric performance enhancement. 0.51 Pb(Ni 1/3 Nb 2/3 )O 3 -0.49 Pb(Hf 0.3 Ti 0.7 )O 3 (PNN-49PHT) ceramics with Pr 3+ doping ceramics were designed and fabricated by a two-step precursor method. Excellent dielectric diffusion coefficient ( γ ) of 1.96 was achieved at the low Pr 3+ doping concentration of 0.2 %. Increased relaxation enhanced the nanoscale domains formation, resulting in a giant strain response ( d* 33 ) of 1400 pm/V at 10 kV/cm, and a total strain ( S tol ) of 0.27 % at 20 kV/cm. Structural refinement unveiled that the high piezoelectricity originated from the mainly substitution of Pr 3+ for Pb 2+ at the A-site, inducing lattice distortion and phase transitions. Local domain switching and long-range ordered destruction were investigated by piezoresponse force microscopy (PFM) and Scanning Electron Microscopy (SEM). These findings contribute to the advancement of piezoelectric devices and provide valuable insights for the design and optimization of high-performance piezoelectric ceramics .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Peng Liu,Cong Ma,Ying Li,Liming Wang,Linjie Wei,Yinlei Yan,Fengwei Xie
This work demonstrates a facile and “green” method to prepare eco-friendly, flexible, transparent, and ionically conductive starch-based materials, which have great potential for personal health-monitoring applications such as disposable electrodes. This method relies on the use of the CaCl2 solution and enables both the efficient disorganization and amorphization of high-amylose starch granules with low energy consumption and the reinforcement of the starch chain network by starch–metal cation complexation. Specifically, the method involves a simple mixing of a high-amylose starch with the CaCl2 solution followed by heating the mixture at 80 °C for 5 min. The whole process is completely environmentally benign, without any waste liquid or bioproducts generated. These resulting materials displayed tunable mechanical strength (500–1300 kPa), elongation at break (15–32%), Young’s modulus (4–9 MPa), toughness (0.05–0.26 MJ/m3), and suitable electrical resistivity (3.7–9.2 Ω·m). Moreover, the developed materials were responsive to external stimuli such as strain and liquids, satisfying the requirements for wearable sensor applications. Besides, composed of only starch, CaCl2, and water, the materials are much cheaper and eco-friendly (can be consumed by fish) compared with other polymer-based conductive hydrogels.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zeng Liu,Xing Wu,Shu He,Jia Liu,Xinyu Wei,Wei Shao
Intelligent electronic devices have been diffusely used in health detection, energy storage, and biomedicine based on their autonomy, flexibility, and adaptive improvement, but traditional materials have the drawbacks of limited flexibility, instability, and inadequate reusability. Herein, poly(acrylic acid)-based hydrogels with efficient self-healing performance and high-precision sensing performance were constructed by a supramolecular self-assembled strategy based on electrostatic interactions, metal coordination, and hydrogen bonds. This hydrogel exhibited a tensile strength of 102.9 kPa and an elongation at break of 990% with good fatigue resistance and self-recovery ability. The hydrogel also displayed good light transmission and UV-shielding effects, as well as good adhesion ability on different materials. Besides, the hydrogel had an electrical conductivity of 0.98 S/m, which could light up a light-emitting diode (LED) bulb when connected in a circuit. Based on these great features, the hydrogel exhibited ultrahigh sensitivity with gauge factor values of 4.00 and 17.00 within the strain ranges of 0–200 and 600–800%, respectively. The hydrogel could be applied not only for large human movements but also for detecting subtle movements. Most importantly, the hydrogel exhibited a great self-healing property, which could almost self-heal within 6 h with a healing efficiency of 99%. Therefore, this work provides a multifunctional hydrogel construction method, and the prepared hydrogels displayed great potential application in the strain sensor field.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 11
·8059-8066
·
IF 2.993
Lv Yu-Kai,Duan Shao-Feng,Zhao Zhi-Hao,Kang Xin-Yu,Ge Rui-Fang,Wang Hongqiang,Dai Yejing
By the traditional solid-state reaction method, Bi 0.5 (Na 0.8 K 0.2 ) 0.5 Ti 1− x (Fe 0.5 Nb 0.5 )
x
O 3 (marked as BNKT- x FN; x = 0.00, 0.01, 0.02, 0.03 and 0.04) piezoelectric ceramics were fabricated, and the effects of FN substitution on the dielectric, ferroelectric, piezoelectric and electric field-induced strain performance were investigated. The relative dielectric permittivity and loss tangent reveal that the phase transition temperature between ferroelectric and ergodic relaxor phase is reduced from 90 °C to room temperature (RT), even below RT, with increasing FN content. Temperature dependence of polarization–electric field loops and strain-electric field curves exhibits that the ferroelectric order is disturbed gradually, and the ergodic relaxor phase forms with increasing FN content. A large unipolar strain of 0.42% and corresponding d 33 * (= S max / E max ) of 642 pm/V for the sample with x = 0.04 are obtained under 6.5 kV/mm due to the phase transition from ergodic relaxor to ferroelectric. These results indicate that the (Fe 0.5 Nb 0.5 ) 4+ complex ion-modified BNKT-based ceramics would have great potentials for lead-free electromechanical actuator applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Chenxi Niu,Qian Fu,Youhui Chen,Yutao Xu,Teng Long,Lingbin Lu
Ionic hydrogels, with adjustable physical and chemical properties, have been widely developed in the field of flexible sensing. The structural and functional integrity of ionic hydrogels under operational conditions is essential for their long-term stability and practical applicability. Herein, a rigid-flexible coupling crosslinking strategy was proposed, where p -phenylenediamine and urea served as complementary crosslinkers (rigid and flexible, respectively) within a carboxymethyl cellulose-based network. The rigid flexible coupling crosslinking network was constructed by a simple one-step method, enabling tunable flexibility through adjusting crosslinker ratios. This strategy not only enhanced the crosslinking density (tensile strength: 55.56 kPa) but retained the mobility of the polymer chain, endowing the hydrogel with the self-healing efficiency up to 90.41 % after 16 h and robust adhesion (221.69 kPa on aluminum). The noncovalent interactions based on aromatic rings (from benzene rings) and hydrogen bonding (from p -phenylenediamine) further contributed to these multifunctional properties. Additionally, the hydrogel exhibited high ionic conductivity (3.14 S/m) with high sensitivity (GF = 2.87 (50–200 %)) and rapid strain-responsive behavior (280 ms response and 260 ms recovery times), allowing accurate detection from subtle to large-scale body movements. These integrated advantages positioned the hydrogel as a promising candidate in the field of flexible sensing.
研究领域:
材料科学
·
生物医学工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4570-4579
·
IF 2.7
Nana Li,Yuncong Yang,Balaji Murugesan,Yong Zhang,Zhuo Chen,Xiaogang Yang,Yurong Cai
To achieve a conductive hydrogel with favourable mechanical and electrical properties, an oriented Mxene-SNF (MSNF) conductive hydrogel was developed using the directional freezing technique. This process involved combining silk fibroin nanofibers (SNF) rich in β-sheet structures with MXene nanosheets to establish an oriented internal cross-linked network. The study investigated the influence of various factors on the hydrogel's mechanical and electrical properties. Results demonstrated that the hydrogel's mechanical properties were influenced by SNF content, MXene content and internal structure. Optimal mechanical properties and favourable electrical conductivity were achieved when the SNF mass fraction was 10%, the MXene mass fraction was 10%, and the internal structure was oriented. The obtained oriented MSNF hydrogel displayed a tensile strain of 80% ± 3%, a tensile stress of 0.89 ± 0.03 MPa, and an elastic modulus of 3.41 ± 0.05 MPa, roughly twice that of the human forearm skin. It maintained a stable resistance response at 0–70% tensile strain. To demonstrate its stability and durability, the hydrogel underwent 500 cycles within the 30–50% tensile strain interval. Therefore, the conductive hydrogel exhibits the potential to be attached to different parts of the human body for real-time monitoring of human movement. Its strain-sensing potential holds value in the field of flexible wearable sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Jinshun Lu,Xiao Han,Lin Dai,Chenyu Li,Jingfeng Wang,Yongda Zhong,Faxin Yu,Chuanling Si
The development of biomass-based hydrogel conductive devices is a promising but challenging subject. Here, cellulose was used to develop a strong, tough, and self-adhesive conductive hydrogel by constructing a synergistic covalent cross-link network and multiple physical interactions. Tannic acid-coated cellulose nanofibrils (TA@CNFs), poly(acrylamide), and ferric ions (Fe 3+ ) were introduced in a composite network by coordination and hydrogen bonds. The strategy of interpenetrating network endowed this hydrogel with high mechanical strength (storage modulus over 14 K Pa), and strong toughness and tensile strength (fracture stress up to 108 K Pa). Chelated Fe 3+ by metal coordination as inorganic conductive phase leads to good electrical conductivity (conductivity up to 3.12 S m −1 ). The obtained hydrogel also exhibited fine flexibility, extensive self-adhesion, and adjustable strain responsiveness for monitoring human joint movements. This work provided a new approach to design conductive hydrogels, and also can expand the application of cellulose-reinforced materials in the sensor field.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2020
·Vol. 7
·期 9
·2450-2459
·
IF 12.319
Jin Jia,Jun-Hong Pu,Jun-Hong Liu,Xing Zhao,Kai Ke,Rui-Ying Bao,Zheng-Ying Liu,Ming-Bo Yang,Wei Yang
Flexible and stretchable strain sensors have broad applications in human physiological activities, object deformation, as well as human–machine interface. However, it is still challenging to fabricate stretchable strain sensors with linear and superior piezoresistive signal response. Herein, we report a facile and scalable microstructure design strategy to generate a unique segmental hierarchical fiber-surface structure that mimics an arthropod's body and a lobster's tail structure for achieving linear strain sensing response. The alternate modulus difference of the micro-nanoscale segmental soft (thermoplastic polyurethane, TPU)-hard (polystyrene, PS) configurations enables the initiation of significant strain concentration effect, which is consistent with the finite element analysis, thus allowing to tune the sensing properties, for e.g., the linear degree varies from 0.48 to 0.99 and the gauge factor ranges from 5.25 to 23 800 for the strain within 30%. The bionic structured fiber sensors demonstrate potential applications for the detection of human skin epidermal disturbance, small curvature changes, sound wave vibration, as well as mechanochromic response if a fluorescent agent is added to the TPU core. Besides, they are also capable of detecting various types of organic vapors due to the strain amplification effect heterogeneous structure design, paving a new way for the design of multifunctional flexible sensors for variable human–machine interface applications.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Wenshuang Chu,Kaifeng Wang,Siyu Liu,Yujie Chen,Hua Li,Hezhou Liu
Confronted with ever-increasing electromagnetic radiation problems, developing microwave absorbing materials with tunable effective absorption bandwidth (EAB) is in high demand. In this work, chitosan-derived carbon-based aerogel was synthesized by unidirectional freeze-drying and the following high-temperature carbonization process. The dielectric-magnetic coupling effect was facilitated by the construction of the 3D conductive network, along with the decoration of the Co nanoparticles and the doping of heteroatoms within the carbon-based framework. Therefore, the aerogel achieved minimum reflection loss intensity of -44.30 dB at 5.20 GHz when carbonizing the precursor at 800 °C. More significantly, the strain-responsive properties of the aerogel endows it with tailorable electromagnetic response behaviors, thereby controlling the effective absorption bandwidth covering from X band to Ku band. This work paves the way for designing next-generation microwave absorption materials with tunable microwave absorption bandwidth, catering to stringent practical requirements prospectively.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xing Li,Suijun Xiao,Yufei Lao,Dacheng Li,Qiaoyan Wei,Liangdong Ye,Shaorong Lu
Biomass-based flexible sensors with excellent mechanical and sensing properties have attracted significant attention. In this study, based on the excellent dispersibility and degradability of nanocellulose crystals, we designed a polyvinyl alcohol/nanocellulose crystals/phytic acid (PCP) composite film with good flexibility and high sensitivity to humidity. A layer of multiwalled carbon nanotubes (MWCNT) and nanocellulose crystals (CNC) was further sandwiched between two PCP layers as a flexible multifunctional sensor (PCPW) to detect human movement and respiration. Phytic acid contains abundant phosphate groups that enhance proton conduction, allowing the PCPW composite film to change its electrical resistance in a sensitive and repeatable manner when the relative humidity was varied between 35 %–93 %. Meanwhile, CNC derived from sisal fibers enhanced the PCPW sensor's conductivity (3.3 S/m) and mechanical properties (elongation at break: 99 %) by improving the dispersion and connectivity of MWCNT. The PCPW sensor displayed a high sensitivity to strain (gauge factor: 49.5) and could monitor both facial expressions (smiling and winking) and the bending of joints. The sensor also generated stable electrical responses during breathing and blowing due to the change in humidity. Therefore, this biodegradable and multifunctional sensor has good application prospects.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·337-345
·
IF 7.393
Hongrui Jia,Zhigang Liang,Zhen Li,Fei Li,Linghang Wang
Ferroelectric ceramic materials with large and temperature-insensitive strain responses are highly desired for the practical application of actuators in harsh environmental conditions. In this work, novel xBi(Mg1/2Zr1/2)O3–(0.55 − x)PbZrO3–0.45PbTiO3 (xBMZ-PZ-0.45PT) ternary ferroelectric ceramics were successfully fabricated by a solid-state reaction process. The phase structure of xBMZ-PZ-0.45PT ceramics gradually evolves from rhombohedral-tetragonal coexistence phases to rhombohedral phase with an increase in the BMZ content and the diffuse phase transition behavior becomes increasingly evident. The relaxation behavior is strongest for x = 0.35 composition. Pmax and Pr values first gradually increased, and then gradually decreased with increasing BMZ content, while Ec values display an increasing trend. A large strain response of 0.33% at 5 kV mm−1 was obtained in this ternary ferroelectric ceramics with x = 0.35, which can be attributed to the electric field-induced reversible ergodic relaxation phase to the ferroelectric phase transition. The strain was simultaneously temperature-insensitive with a slight decrease from 0.33% at 30 °C to 0.32% at 150 °C. The results indicate that BMZ-PZ-PT ternary ferroelectric ceramics are promising candidate materials for actuator applications in harsh environmental conditions.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RHEOLOGY
·
2015
·Vol. 59
·期 4
·971-993
·
IF 3.358
Zheng Zhong,Song Yihu,Wang Xiang,Zheng Qiang
Variation of colloidal and interfacial interactions leads to a microstructural diversity in fumed silica dispersions exhibiting absolutely different sol- or gel-like rheological responses. In this study, fumed silicas with different surface areas (200–400 m 2 /g) and surface characteristics (hydrophilic or hydrophobic) are dispersed into moisture-cured polyurethane. The microstructures investigated using transmission electron microscope are associated perfectly with three different rheological behaviors: (i) Sols with well-dispersed silica aggregates, (ii) weak gels with agglomerate-linked networks, and (iii) strong gels with concentrated networks of large agglomerates. Though sols and gels are well distinguished by shear thickening or sustained thinning response through steady shear flow test, it is interesting that the sols and weak gels exhibit a uniform modulus plateau-softening-hardening-softening response with increasing dynamic strain at frequency 10 rad s −1 while the strong gels show a sustained softening beyond the linear regime. Furthermore, the onset of softening and hardening can be normalized: The two softening are isoenergetic at mechanical energies of 0.3 J m −3 and 10 kJ m −3 . On the other hand, the hardening is initiated by a critical strain of 60%. The mechanisms involved in the generation of the sol- and the gel-like dispersions and their structural evolutions during shear are thoroughly clarified in relation to the polyols, the characteristic and content of silica and the curing catalysts.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）