JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 9
·4320-4327
·
IF 2.302
Dai Fei,Chen Feng,Wang Tao,Feng Shaoguang,Hu Chunlin,Wang Xinling,Zheng Zhen
Epoxy adhesive as an engineering material has more and more applications in industry. But to date, water resistance of the adhesive is still a very difficult problem to be solved. By mimicking mussel adhesive proteins, dopamine (DA) was applied as one of the two curing agents of epoxy adhesive to improve the water resistance of the adhesive, and the other was phenethylamine (PEA). The effects of the contents of DA on both adhesion property and water absorption of epoxy/PEA/DA adhesives were investigated in detail. The results of lap shear test (LST) showed that the adhesion strength of the epoxy adhesives after the introduction of proper amount of DA was still up to 7 MPa even after the sample was immersed in water for over 230 days. And then the effects of metal ions Zn(II) and Fe(III) on the adhesion properties of the epoxy adhesives were also further studied. It was found that the adhesion strength of the adhesives, when the content of DA was no more than 5 wt%, can be further increased through the complexation of a small quantity of ferric ions with DA. The coordination mechanism of catechol with Fe(III) ions in the system has been investigated by both UV/Vis spectra and XRD curves. The results testified that more bis-catecholate complexes form at high DA: Fe ratios and thus the adhesives have higher cohesion strength for having more regular structures after curing. In a word, the introductions of proper amount of DA and metal ion endow the epoxy adhesive better water resistance and excellent adhesion properties.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 8
·1644-1652
·
IF 4.046
Wenshuai Zhang,Lingxiao Xu,Meijin Zhao,Yuning Ma,Ting Zheng,Lei Shi
Developing multifunctional hydrogels with stretchability, self-healing ability, adhesiveness, and conductivity into flexible strain sensors for human motion and health monitoring has attracted great attention and is highly desired. However, the present motion detectors mainly focus on stretching, bending, and twisting of different body parts while the expansion–contraction motion has been rarely investigated. In this study, along with carbon nanotubes (CNTs) as conductive components, sodium alginate (Alg) modified with 3-aminophenylboronic acid (PBA) and dopamine (DA) were synthesized and employed as precursors to prepare a multifunctional Alg-CNT hydrogel. The formed dynamic covalent bonds between PBA and DA endowed the hydrogel with a rapid self-healing property (30 s) while the introduction of CNTs remarkably enhanced the mechanical strength and electrical conductivity of the hydrogel. Moreover, the as-prepared hydrogel displayed a satisfactory stretchability (500%) and self-adhesiveness to various substrates. When used as a strain sensor, the Alg-CNT hydrogel that exhibited a fast response (150 ms) and ultra-durability (over 30 000 cycles) was demonstrated to be capable of monitoring subtle expansion–contraction motions (e.g., human breathing and mouse heart beating) via periodic and repeatable electrical signals. Therefore, this multifunctional hydrogel is highly suitable for monitoring expansion–contraction motions, indicating its potential applications in personal health monitoring.
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
PubMed
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 17
·2986-2994
·
IF 5.342
Wen Jing Yang,Wenya Xu,Xi Tao,Wen Wang,Yaqin Hu,Xue Li,En-Tang Kang,Lianhui Wang
The fabrication of adhesive hydrogel systems is quite important for biological applications. Herein, two-stage thiol-based click reactions have been employed for the preparation and adhesion of hydrogels. In the first stage, two self-adhesive hydrogels (HG-1 and HG-2) were constructed via the thiol-based click reactions and thiol–thiol coupling reaction under different stimuli, employing the same functional copolymer poly(propargyl methacrylate-co-N-(3,4-dihydroxyphenethyl) methacrylamide-co-poly(ethylene glycol) methyl ether methacrylate) (poly(PMA-co-DMA-co-PEGMA), polyPDP) and a 4-arm thiol-PEG cross-linker. Subsequently, the two prepared hydrogels achieved responsive self-adhesion properties via the second stage of thiol-based click reactions between the preserved functional groups under different stimuli. Moreover, the self-adhered hydrogels exhibited increased mechanical strength after adhesion. The present strategy thus provides a facile approach for the fabrication of hydrogel systems with on-demand self-adhesive properties.
研究领域:
生物材料
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhengbiao Liu,Dechao Hu,Chengyu Zheng,Kanghua Yu,Xiancheng Zhang,Wenshi Ma
Silicone elastomers, as good sealants and adhesives, have been widely applied in protective coatings, architectural decoration, electronic packaging, and other fields. However, the traditional cross-linking of silicone elastomers is highly dependent on toxic catalysts or heavy metals, which may inevitably lead to severe environmental pollution. Moreover, most silicone elastomers suffer from a poor adhesive performance. In this study, inspired by the high adhesion properties of mussels, an eco-friendly and catalyst-free silicone elastomer with high adhesion properties was prepared by using dopamine as a cross-linker and amino-functionalized polysiloxane as a base. Under mild conditions (pH = 8.5), dopamine was self-polymerized and underwent Michael addition and Schiff base reactions with amino groups to form robust elastomers. It was found that the cross-linking degree gradually increases with the dopamine content increasing from 2 to 6%, and the solvent resistance and thermal stability exhibit significant improvement. Meanwhile, the tensile strength increased by 245% from 0.22 to 0.77 MPa. Especially, the as-obtained silicone elastomers have excellent adhesion to different materials. The lap shear strength with aluminum substrates (1.09 MPa) is 3.6 times higher than that of conventional silicone elastomers. The development of catalyst-free bioinspired silicone elastomers with high adhesion may shed light on the research of eco-friendly silicone materials and offer innovative insight for mussel-inspired adhesives.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Li Yang,Mingliang Wu,Xueli Yang,Baofeng Lin,Lihua Fu,Chuanhui Xu
This study reports healable, recyclable, and adhesive rubber composites equipped with ester linkages, Zn 2+ ionic bonds , and H-bonds based on carboxylic styrene butadiene rubber (XSBR), nano-ZnO, and diglycidyl ether of bisphenol A (DGEBA). Zn 2+ ionic cross-links are introduced into XSBR networks through the acid-base reaction between nano-ZnO and carboxyl groups of XSBR. The in-situ generated Zn 2+ is thus evenly dispersed in the rubber matrix to serve as transesterification catalyst, which promotes the healing and reprocessing of the rubber composites at a higher temperature. The healing efficiency of the rubber composites can realize 75% and further improved to 90% after introducing additional hydroxyl groups. The rubber composites can reprocess at least 5 times. Moreover, the rubber composites are easily disintegrated to recycle neat XSBR due to the dissociation of ester linkages in the alkaline solution. Interestingly, the rubber composites show a surprising reversible adhesion property under water stimulation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xinling Hu,Jitian Chen,Zijian Yan,Du Nie,Fuwang Guan,Chenyang Shi,Naibo Lin
Multifunctional hydrogels with excellent adhesion, biodegradability, and conductivity are essential for overcoming the obstacles of postoperative secondary injury, flexible sensing instability, and so on. Herein, we develop a multifunctional silk fibroin (SF) hydrogel modified with poly(acrylic acid). Owing to the stable chemical cross-linking network and the abundant carboxylic acid groups of the SF network, the SF hydrogel exhibits a high tensile strength of 74.34 kPa due to sufficient cohesion and interfacial interactions. Additionally, the tensile strain reaches a maximum of 414.6%, the compressive strength is 0.9 MPa, and the shear adhesive strength for pig skin tissues is as high as 64 kPa. Compared with most hydrogels, our multifunctional SF hydrogel with a low swelling ratio provides excellent adhesion, biodegradation, and conductivity, which shows advantages in terms of invasive tissue sealing. The use of self-adhesive SF hydrogels as conductive hydrogels in flexible sensors also benefits the collection of physiological electricity and human motion signals in the field of wearable and implantable electronic devices.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Zhiyu Zhang,Sha Liu,Haihu Tan
Hydrogels have broad application prospects in biomedicine, energy, and tissue engineering due to their high water content, adjustable physicochemical properties, and flexibility. In general, the poor stretchability and adhesion of hydrogels limit their application in flexible wearable electronics. In this work, a composite hydrogel (GM hydrogel) with excellent adhesion, stretchability, and conductivity was prepared by a one-pot synthesis process through the hydrogen-bonding interaction between P(AM-co-AA)) and gallic acid (GA). Natural plant polyphenol GA not only enhances the mechanical properties of the hydrogel (maximum tensile strain of 890% and maximum tensile stress of 238 kPa) but also gives the hydrogel adhesion (9 kPa). GM hydrogel can be further used to construct strain sensors and self-powered sensors. GM hydrogel strain sensors can be attached to finger joints to monitor and distinguish the angles of finger joint bending. Self-powered sensors based on GM hydrogels can stably transmit encrypted signals. Therefore, multifunctional GM hydrogels can be used for electronic skin, human motion monitoring, and wearable biosensors.
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
·
2024
·
IF 4.4
Lide Xu,Yumin Wang,Hua Li,Zhiqiang Hou,Xiao Miao,Gan Miao,Fangchao Li,Jingwei Lu,Guina Ren,Xiaotao Zhu
Conductive hydrogels with self-adhesive property have received increasing attention in the fields of human–computer interaction, smart wearable devices, and soft electronic materials; however, they are easily contaminated by oil due to their sticky property, which will degrade their appearance and performance in daily use and make it difficult to be used in the complex oily water environment. Herein, a type of Janus TA@PVA/PSBMA hydrogel with slippery oil repellency and sticky adhesion is prepared by partially compounding the PVA/PSBMA hydrogel with tannic acid (TA) molecules through a unilateral soaking method. The upper PVA/PSBMA hydrogel layer in the Janus hydrogel exhibits excellent antioil fouling capability in air, underwater, and even under oil environments, because of the strong water affinity of the zwitterionic PSBMA chains. Interestingly, the bottom TA@PVA/PSBMA hydrogel layer can adhere to various substrates with bonding strength through active interactions between the TA molecules and the substrates. Exploiting its conductive, antifouling, and self-adhesive properties, the obtained Janus TA@PVA/PSBMA hydrogel is demonstrated as a strain sensor that can stably monitor large and subtle body movements in air, underwater, and oily wastewater. This work is expected to present a material for reliable sensing in complex environments.
研究领域:
材料科学
·
生物医学工程
·
软体电子材料
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2025
·
IF 10.7
Yuxian Su,Tianfu Song,Li Liu,Shipeng Wen
In recent years, liquid-crystalline polymers containing azobenzene moieties that show phototunable glass transition temperatures, have been successfully used in adhesion, reversible mechanical actuation, athermal nano-imprinting, self-healing, energy storage, and other applications. Unfortunately, the physical principles and properties underlying the dynamic equilibrium behaviors when both trans and cis isomers are triggered simultaneously remain elusive, and experiments are challenging due to the difference in penetration depth between ultraviolet and visible light sources. Here, we develop a novel environmentally friendly adhesive with near-infrared (NIR) light-driven and reusability through the integration of highly efficient UV/Blue-emitting upconversion particles (UCNPs) and siloxane main-chain azobenzene molecular photoswitch, and achieve simultaneously bicolor emissions inside the composite by facilely modulating the external excitation power, triggering both the trans and cis isomers. We numerically and experimentally show these azobenzene molecules inside the composite exhibited the dynamic equilibrium of partial trans-isomer → cis-isomer and cis-isomer → trans-isomer transitions under the NIR irradiation of high power and low power, respectively. Under high-power NIR light excitation, the high-intensity dynamic isomerization reaction of the complex not only produced "free volume expansion" but also led to structural changes at the condensed scale, thereby significantly decreasing its elasticity and viscosity. In addition, robust switching of its adhesion strength was demonstrated over six cycles. This study shows that the combination of azobenzene polymers and upconversion luminescent materials has great application potential as NIR photoresponsive materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Yumeng Li,Yongsheng Ni,Wei He,Haoran Li,Wendi Zhang,Lijun Tan,Jinsong Zhao,Baocai Xu
In order to solve the problem of poor adhesion of polysaccharide coatings in meat storage and inconvenient secondary spraying, which leads to poor preservation effect, this study was inspired by the property of mussels to adhere firmly to surfaces and design a bioactive composite coating. Here, curcumin-loaded zein nanoparticles (CZ NPs) were successfully prepared and incorporated into carrageenan-based biocomposite coatings for chilled meat preservation. The prepared curcumin-zein-riboflavin-carrageenan (CZRC) coating featured smooth spherical morphology and the solubility of hydrophobic substances, the adhesion and stability of the composite coating were respectively improved to 3.8 and 6 times compared to CZ NPs. The CZRC coating also shows desirable antioxidant activity (89.78 ± 4.8 % on DPPH and 91.40 ± 2.1 % on ABTS +) and the treatment based on CZRC coating under light irradiation reduced Pseudomonas fragi (by 2.02 log CFU/mL) and Brochothrix thermosphacta (by 4.35 log CFU/mL), which prolonged the shelf life of lamb and pork to 1.8 and 2.3 times at 4 °C storage condition. This work provides a viable strategy for the development of highly adhesive coatings with self-activation enhanced activity to achieve long-lasting preservation.
研究领域:
食品科学
·
生物材料学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Zijian Gao,Shengyu Sun,Xin Guan,Yongqi Yang,Jian Sun,Hailun Ren,Zhaohui Jin
Ensuring adhesion over wide temperature range is of considerable significance for hydrogel-based wearable sensors, especially in extreme environments. In this research, a hydrogel with adhesive properties over a wide temperature range (−20–80°C) was prepared by copolymerizing 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylic acid (AAc), and sodium lignosulfonate (LS) in binary solvent of H 2 O and glycerol (Gly). Hence, the hydrogel acquires adhesive properties through the establishment of non-covalent interactions with the substrate surface, encompassing hydrogen bonding, metal complexation, and electrostatic interactions. At −20°C, ambient temperature (20°C), and 80°C, the hydrogel exhibits significant shear strength of 39.8, 74.3, and 46.9 kPa. In addition, chemical crosslinking points, hydrogen bonding and electrostatic interaction are imparted with good mechanical properties to withstand large tensile and flexible deformation, achieving a fracture stress of 120 kPa and a strain of 14,288%. Furthermore, the hydrogel exhibits outstanding electrical conductivity, reaching up to 1.58 S/m owing to a substantial concentration of free conductive ions. Moreover, this sensor is able to provide a constant and stable change in electrical resistance signal and is used to monitor human movement signals. This makes it possible to employ AAc/AMPS/H 2 O/Gly/LS hydrogels as wearable flexible sensors in extreme environments.
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
Small Methods
·
2025
·
IF 9.1
Lei Wang,Jingrui Li,Meng Zong,Yi Liu,Jianfeng Zhu,Limin Wu,Renchao Che
Fabrication of gel-based microwave absorbers is an effective strategy for overcoming the shortcomings of conventional powder-like absorbers, such as complicated processes and undesirable properties. However, the present gel-based microwave absorbers generally consist of a polymer skeleton and a liquid dispersion medium and suffer from leakage of the dispersion medium. In this study, a novel gel-like poly(ionic liquid) (PIL) microwave absorber with excellent properties is prepared. A maximum reflection loss (RL max ) of −58.8 dB GHz and an effective absorption bandwidth (EAB) of 10.56 GHz are achieved, which is mainly ascribed to high ionic conduction loss derived from lower glass transition temperature (T g ). Furthermore, the prepared PILs consisted of cationic imidazole-containing alkoxy moieties as the polymer chain and bis(trifluoromethanesulfonyl) imide (TFSI − ) as the counter ion in the absence of a dispersion medium. The PILs displayed stretchability and adhesive and self-healing abilities, thus providing a new candidate for developing high-efficiency microwave absorbers for practical applications.
研究领域:
材料科学
·
电磁学
✓ 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）