ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hao Chen,Xiuyan Ren,Guanghui Gao
In recent years, nature-inspired conductive hydrogels have become ideal materials for the design of bioactuators, healthcare monitoring sensors, and flexible wearable devices. However, conductive hydrogels are often hindered by problems such as the poor mechanical property, nonreusability, and narrow operating temperature range. Here, a novel skin-inspired gel is prepared via one step of blending polyvinyl alcohol, gelatin, and glycerin. Due to their dermis-mimicking structure, the obtained gels possess high mechanical properties (fracture stress of 1044 kPa, fracture strain of 715%, Young’s modulus of 157 kPa, and toughness of 3605 kJ m–3). Especially, the gels exhibit outstanding strain-sensitive electric behavior as biosensors to monitor routine movement signals of the human body. Moreover, the gels with low temperature tolerance can maintain good conductivity and flexibility at −20 °C. Interestingly, the gels are capable of being recovered and reused by heating injection, cooling molding, and freezing–thawing cycles. Thus, as bionic materials, the gels have fascinating potential applications in various fields, such as human–machine interfaces, biosensors, and wearable devices.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Tianqi Cui,Yuxue Sun,Yue Wu,Jiarong Wang,Yangyue Ding,Jianjun Cheng,Mingruo Guo
Novel gelatin/dialdehyde starch (GDS) hydrogels based on gelatin were prepared using dialdehyde starch as a macromolecular crosslinking agent. Fourier transform infrared spectroscopy , Raman spectroscopy , and X-ray diffraction showed that the dynamic hydrogel network was formed by covalent imine bonds and hydrogen bonds between dialdehyde starch and gelatin. The synergistic physical and chemical cross-linking endowed the hydrogels with excellent mechanical properties (maximum compressive stress was 0.55 MPa), fatigue resistance (they maintained their shape after ten compression cycles), toughness (54.6 kN/m 2 ), and self-recoverability of the polymeric network. In the rheological tests, all the storage modulus were higher than loss modulus, indicating that they are elastic gels and not viscous sols. The polymer network of GDS hydrogels could recover rapidly when subjected to oscillating shear strain. In addition, with increasing dialdehyde starch concentration, the hydrogels had higher swelling stability and a denser microstructure. Given these excellent properties, the hydrogels have potential application prospects as cell culture scaffolds and carriers of bioactive substance.
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 Materials & Interfaces
·
2016
·
IF 7.145
Lin-Lin Zhang,Huan-Huan Li,Yan-Hong Shi,Chao-Ying Fan,Xing-Long Wu,Hai-Feng Wang,Hai-Zhu Sun,Jing-Ping Zhang
In this paper, gelatin as a natural biomass was selected to successfully prepare an oxygen-enriched carbon with layered sedimentary rocks structure, which exhibited ultrahigh-rate performance and excellent cycling stability as supercapacitors. The specific capacitance reached 272.6 F g–1 at 1 A g–1 and still retained 197.0 F g–1 even at 100 A g–1 (with high capacitance retention of 72.3%). The outstanding electrochemical performance resulted from the special layered structure with large surface area (827.8 m2 g–1) and high content of oxygen (16.215 wt %), which effectively realized the synergistic effects of the electrical double-layer capacitance and pseudocapacitance. Moreover, it delivered an energy density of 25.3 Wh kg–1 even with a high power density of 34.7 kW kg–1 and ultralong cycling stability (with no capacitance decay even over 10 000 cycles at 2 A g–1) in a symmetric supercapacitor, which are highly desirable for their practical application in energy storage devices and conversion.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 22
·3890
·
IF 4.329
Chenlu Jiao,Die Liu,Nana Wei,Jiannan Gao,Fan Fu,Tao Liu,Jian Wang
Porous sustainable cellulose/gelatin/sepiolite gel beads were fabricated via an efficient ‘hydrophilic assembly–floating droplet’ two-step method to remove Congo red (CR) from wastewater. The beads comprised microcrystalline cellulose and gelatin, forming a dual network framework, and sepiolite, which acted as a functional component to reinforce the network. The as-prepared gel beads were characterized using FTIR, SEM, XRD, and TGA, with the results indicating a highly porous structure that was also thermally stable. A batch adsorption experiment for CR was performed and evaluated as a function of pH, sepiolite addition, contact time, temperature, and initial concentration. The kinetics and isotherm data obtained were in agreement with the pseudo-second-order kinetic model and the Langmuir isotherm, with a maximum monolayer capacity of 279.3 mg·g−1for CR at 303 K. Moreover, thermodynamic analysis demonstrated the spontaneous and endothermic nature of the dye uptake. Importantly, even when subjected to five regeneration cycles, the gel beads retained 87% of their original adsorption value, suggesting their suitability as an efficient and reusable material for dye wastewater treatments.Keywords:microcrystalline cellulose;gelatin;sepiolite;beads;dye;adsorption
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 MATERIALS SCIENCE
·
2019
·Vol. 55
·期 9
·3991-4004
·
IF 3.442
Liu Jiahang,Song Hongzan,Wang Zihao,Zhang Jianxin,Zhang Jun,Ba Xinwu
A novel chemical cross-linked ionogels with excellent self-healability, stretchability, and reprocessability based on gelatin have been synthesized via the Schiff base reaction in ionic liquid of 1-ethyl-3-methylimidazolium acetate (EMIMAc). Rheological measurements revealed that the plateaus modulus in storage modulus increases with increase in the content of gelatin. These ionogels displayed good thermal mechanical stability, and the chemical networks were not destroyed even at temperature up to 140 °C. High stretchability was obtained and the elongation at break for the as-prepared ionogel could even reach 368.6%. Importantly, the prepared ionogels showed excellent self-healability and reprocessability. Remarkably, the ionogels exhibited superior ionic conductivity and room temperature ionic conductivity was higher than 1.0 × 10 −3 S/cm. Furthermore, supercapacitors with this ionogel electrolyte showed temperature-dependent specific capacitance and remarkable flexible performance. Therefore, the as-prepared self-healable and reprocessable ionogels from the nature of gelatin, with highly ionic conductivity and stretchability, could be considered an excellent electrolyte candidate for various next-generation stretchable electronics.
研究领域:
材料科学
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能源存储
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 7
·2101382
·
IF 8.856
Lilong Cao,Zhijie Zhao,Xueying Wang,Xueli Huang,Junjie Li,Yuping Wei
Forming natural polymers-based hydrogels with enhanced mechanical strength, outstanding antifreezing property and superior conductivity is still a challenge. Here, gelatin/oxidized dextran hydrogel is fabricated and it shows enhanced mechanical performance, antifreeze tolerance, and conductivity due to the synergistic interaction of ammonium sulfate and betaine. The resulting gelatin/oxidized dextran/(NH 4 ) 2 SO 4 /betaine hydrogel exhibits high stretchability (570%), tough tensile (2.49 MPa) and compressive (46.41 MPa) fracture strength, favorable tensile (6.05 MJ m −3 ) and compressive (3.08 MJ m −3 ) toughness, antifreezing property (−30 °C) and high conductivity (2.86 S m −1 ). Based on the above characteristics, the hydrogel is applied for strain sensor to monitor the joints motion of human body such as finger, wrist, elbow, knee, neck, and throat. The hydrogel can maintain good mechanical performance and stable sensing signal from 25 to −30 °C. Therefore, the designed hydrogel based on natural polymers shows a huge potential for tissue engineering and biosensing under the mild or extreme environment.
研究领域:
材料科学
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生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 9
·2906
·
IF 4.927
Shuying Han,Zhaohua Zhang,Jia Chen,Jie Li,Mi Zhou,Zejian He,Zhen He,Longfei Li
Tympanic membrane perforation (TMP), a common disease, often needs a scaffold as the patch to support surgery. Due to the environment of auditory meatus, the patch can be infected by bacteria that results in failure; therefore, the ideal scaffold may combine biomimetic and antibacterial features. In this work, gelatin was used as the electrospinning framework, genipin as the crosslinking agent, and levofloxacin as an antibacterial in order to prepare the scaffold for TMP. Different contents of levofloxacin have been added to gelatin/genipin. It was found that, with the addition of levofloxacin, the gelatin/genipin membranes exhibit improved hydrophilia and enhanced tensile strength. The antibacterial and cell-cultured experiments showed that the prepared antibacterial membranes had excellent antibacterial properties and good biocompatibility, respectively. In summary, levofloxacin is a good group for the gelatin/genipin scaffold because it improves the physical properties and antibacterial action. Compared with different amounts of levofloxacin, a gelatin/genipin membrane with 1% levofloxacin is more suitable for a TM.Keywords:gelatin;genipin;levofloxacin;nanofiber membrane;tympanic membrane
研究领域:
生物材料学
·
耳科学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 1
·2210188
·
IF 19.924
Menghan Pi,Shanhe Qin,Sihan Wen,Zhisen Wang,Xiaoyu Wang,Min Li,Honglang Lu,Qingdang Meng,Wei Cui,Rong Ran
Swelling is ubiquitous for conventional hydrogels but is not favorable for many situations, especially underwater applications. In this study, an anti-swelling and mechanically robust polyacrylic acid (PAAc)/gelatin composite hydrogel is reported with a rapid gelation process (10 1 s) under mild conditions via the synergy of MXene-activated initiation and zirconium ion (Zr 4+ )-induced cross-linking, without the requirement of external energy input. The MXene is found efficient to activate the chain initiation, while the Zr 4+ is prone indispensable for facilitating the cross-linking of formed polymer chains. The resulting hydrogel exhibits integration of exceptional anti-swelling properties and high mechanical performance at room temperature, thanks to the dense hydrogen bonds between PAAc and gelatin chains that enable an upper critical solution temperature above room temperature. Also, desirable electrical conductivity emerges in the hydrogel due to the simultaneous contribution of MXene and Zr 4+ , allowing stable electrical signal output of the gel upon deformation underwater. As a demonstration, an underwater communicator by harnessing the gel as a sensing module is assembled, which is capable of wirelessly delivering messages to the decoder on the ground via Morse codes. This study provides an exemplary way for the rapid gelation of tough and anti-swelling hydrogels for durable underwater applications.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Haofei Qie,Zengqiang Wang,Jiayuan Ren,Shaoyu Lü,Mingzhu Liu
Developing shape memory hydrogel strain sensors with both high mechanical property and stable electrical performance is a challenge. Here, a hydrogel based on gelatin was reported as a strain sensor. The hydrogel was developed by gelatin grafted polypyrrole , polyacrylamide and tannic acid . The gelatin moieties were exploited to form a water-soluble conductive polymer, endowing the hydrogel with shape memory behavior and addressing the challenge of low conductivity induced by structural inhomogeneity and aggregation of conductive nanomaterials . Tannic acid was introduced to provide hydrogen-bonding and π−π stacking interactions to promote hydrogel mechanical properties . The hydrogel achieved a maximum tensile strength of 1.44 ± 0.11 MPa, maximum toughness of 2581 ± 453 kJ/m 3 and maximum conductivity of 0.58 ± 0.10 S/m. Results demonstrated that the hydrogel showed shape memory property and can respond to and discern different motions. This achievement offers an opportunity to facilitate significant shape memory conductive hydrogel strain sensor with both high mechanical property and stable electrical performance.
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 Materials & Interfaces
·
2022
·
IF 10.383
Tiansheng Gan,Qi Xiao,Stephan Handschuh-Wang,Xiaoqin Huang,Haifei Wang,Xiaobo Deng,Shuangyan Hu,Ben Wang,Qixing Wu,Xuechang Zhou
Adhesion and spreading of liquid metals (LMs) on substrates are essential steps for the generation of flexible electronics and thermal management devices. However, the controlled deposition is limited by the high surface tension and peculiar wetting and adhesion behavior of LMs. Herein, we introduce gelatin-regulated LM droplet deposition and sintering (GLMDDS), for the upscalable production of conformally adhesive, solidlike, yet transient LM thin films and patterns on diverse substrates. This method involves four steps: homogeneous deposition of LM microdroplets, gelation of the LM-gelatin solution, toughening of the gelatin hydrogel by solvent displacement, and peeling-induced sintering of LM microdroplets. The LM thin film exhibits a three-layer structure, comprising an LM microdroplet-embedded tough organohydrogel adhesion layer, a continuous LM layer, and an oxide skin. The composite exhibits high stretchability and mechanical robustness, conformal adhesion to various substrates, high conductivity (4.35 × 105 S·m–1), and transience (86% LM recycled). Large-scale deposition (i.e., 5.6 dm2) and the potential for patterns on diverse substrates demonstrate its upscalability and broad suitability. Finally, the LM thin films and patterns are applied for flexible and wearable devices, i.e., pressure sensors, heaters, human motion tracking devices, and thermal management devices, illustrating the broad applicability of this strategy.
研究领域:
材料科学
·
柔性电子
·
热管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 9
·1926
·
IF 3.426
Yanyi Wen,Bing Yu,Zhongjie Zhu,Zhuoran Yang,Wei Shao
In the present study, sponges with the antibiotic tetracycline hydrochloride (TCH) loaded into alginate incorporated with gelatin (G/SA) were fabricated. The G/SA sponges were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analysis. G/SA sponges show a three-dimensional network structure with high porosity. An excellent swelling behavior and a controlled TCH release performance are observed from G/SA sponges. Moreover, they exhibit good antibacterial activity against both Gram-positive and Gram-negative bacteria.Keywords:alginate;gelatin;porosity;antibacterial
研究领域:
生物材料
·
医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 7
·1400
·
IF 4.967
Mengwen Sun,Yajuan Wang,Lihui Yao,Ya Li,Yunxuan Weng,Dan Qiu
In this study, porous scaffold materials based on polyvinyl alcohol (PVA) and gelatin (Gel) were successfully fabricated and characterized. The mechanism of the reaction, morphology, and crystallinity were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). In addition, thermogravimetric analysis (TGA) was performed together with differential scanning calorimetry (DSC) for examining the thermostability and phase transformation of the scaffolds. Degradation and swelling studies of PVA/Gel composite scaffold materials were performed in phosphate-buffered saline. Finally, the mechanical performances had been determined. According to the results, the polymer matrix that was formed by the combination of PVA and gelatin had better thermal stability. The synthesized composite scaffold was amorphous in nature. The addition of gelatin did not affect the fishbone-like microstructure of PVA, which ensures the excellent mechanical properties of the PVA scaffold. The denaturation temperature and elastic modulus of the PVA scaffold were improved by the gelatin addition, but the physical and chemical properties of the PVA scaffold were weakened when the gelatin content exceeded 10%. In addition, the PVA-10G sample has suitable degradability. Therefore, the PVA/Gel composite scaffold might potentially be applied in the field of tissue engineering that demands high strength.Keywords:polyvinyl alcohol;gelatin;porous scaffold
研究领域:
生物材料学
·
组织工程学
✓ 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）