MACROMOLECULAR MATERIALS AND ENGINEERING
·
2021
·Vol. 306
·期 11
·2100370
·
IF 4.367
Xin Qi,Enyun Xu,Manman Jia,Jichuan Zhang,Liqun Zhang,Dongmei Yue
At present, the synthesis of body temperature triggering shape memory polymers usually requires elaborate structural design, which limits their wide application. Herein, starting from bio-based Eucommia ulmoides gum (EUG), a series of EUG/silica hybrids (ESHs) are prepared through a facile one-pot process, in which EUG is epoxied and then self-crosslinked with SiO 2 by epoxy ring-open reaction. Varying the amount of H 2 O 2 , the shape memory transition temperature ( T trans ) of ESHs is adjusted to 47.4–36.6 ℃, which is close to human body temperature (37 ℃). Among them, ESH-17 exhibited the best body temperature triggering shape memory ability ( T trans = 36.6 ℃), which can restore the permanent shape within 60 s at 37 ℃ with a shape fixity ratio of 99% and shape recovery ratio near 100%. In addition, the shape memory mechanism is discussed and shows some application scenarios of ESHs. The as-produced materials can be used as smart biomaterials such as self-tightening sutures, self-sealing root canal filling materials, and so on.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Yulin Zhang,Yueshan Li,Kaixuan Chen,Zixun Ma,Xiangdong Wang,Lingying Shi,Rong Ran
With the rapid development of mobile networks and smartphones, quick response (QR) code has been more and more applied to various fields. Many individuals also have a QR code containing their own information. But because of its low cost and easy imitation, the QR code not only facilitated people's life but also brought the risk of revealing personal privacy. Therefore, it is very necessary to improve the security of the QR code by some simple encryption methods. Herein, by combining self-healing hydrogel and thermos-sensitive hydrogel, multifunctional dual network hydrogel with good mechanical properties , self-healing ability, and fast temperature sensitivity was synthesized. Moreover, customized patterned thermos-sensitive hydrogels can be obtained by the simple assembly. And the patterns can be triggered by human body temperature and disappeared after cooling at room temperature . Based on these performances, a QR code hydrogel with low cost, accessibility, durability and security features was fabricated for the storage and display of information. And this simple strategy is of universal significance for the synthesis of multifunctional and high-performance 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
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Yang Chen,Tao Liu,Guoyin Wang,Jianzhi Liu,Ling Zhao,Yueqin Yu
Achieving hydrogels with mechanical and self-healing properties is highly desirable for their expanding applications, yet remains an ongoing challenge. The synergistic design of dynamic reversible chemical bond opens a new research direction for this material. Herein, a molecular design strategy is proposed via dynamic reversible ionic bond formed between amino and sulfonic acid groups endow self-healing properties for hydrogels while introducing the N -isopropylacrylamide (NIPAm) crosslinked network realized the strength property including high compressive strength and high ductility, and intrinsic temperature sensitivity due to its unique amphiphilic structure for water. By adjusting the mass ratios of NIPAm, 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and chitosan (CS), the optimal synthesis conditions for the P(AMPS-NIPAm)/CS hydrogel were obtained. Importantly, this intelligent P(AMPS-NIPAm)/CS hydrogel reveals a successful balance between mechanical and self-healing properties into advanced materials. The self-healing efficiency is as high as 98.51%. Furthermore, the lower critical solution temperature (LCST) of sample AMPS/CS-1.4:1 is 37 ℃, which is closest to the human body temperature. These characteristics open a novel pathway to intelligent self-healing hydrogels in terms of drug delivery and wound dressings.
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
RSC Advances
·
2019
·Vol. 9
·期 23
·13104-13111
·
IF 3.049
Hui-Min Dou,Ji-Heng Ding,Hao Chen,Zhen Wang,A.-Fang Zhang,Hai-Bin Yu
In this work, a series of bio-based, biodegradable and amorphous shape memory polyurethanes were synthesized by a two-step pre-polymerization process from polylactide (PLA) diol, polycaprolactone (PCL) diol and diphenylmethane diisocyanate-50 (MDI-50). The ratio of PLA diol to PCL diol was adjusted to investigate their thermal and mechanical properties. These bio-based shape memory polyurethanes (bio-PUs) showed a glass transition temperature (Tg) value in the range of −10.7–32.5 °C, which can be adjusted to be close to body temperature. The tensile strength and elongation of the bio-PUs could be tuned in the range from 1.7 MPa to 12.9 MPa and from 767.5% to 1345.7%, respectively. Through a series of shape memory tests, these bio-PUs exhibited good shape memory behavior at body temperature. Among them, PU with 2 : 1 as the PLA/PCL ratio showed the best shape recovery behavior with a shape recovery rate higher than 98% and could fully reach the original shape state in 15 s at 37 °C. Therefore, these shape memory bio-PUs are promising for applications in smart biomedical devices.
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Chengzhi Chen,Zijian Liu,Liangchao Guo,Bingchen Huo,Qi Sun,Lirong Liang,Chunyu Du,Guangming Chen
Human body temperature is a critical physiological indicator, reflecting metabolism and temperature regulation. Biomimetic temperature sensors with high temporal and spatial resolution are highly desired to emulate human skin's temperature perception capabilities. Here, a selective filtration method is proposed to fabricate a jointless p-n thermoelectric module, integrating p-type and n-type materials with minimal interfacial barriers. The structure enables rapid response, minimal signal variation, and a robust linear relationship between open circuit voltage and temperature difference, making it suitable as a biomimetic thermoreceptor for enhancing humanoid robots with intelligent sensing capabilities. A smart thermoelectric sensing system with a high temporal and spatial resolution is developed using with jointless p-n module as the sensing element. In temporal thermal sensing, the sensing system can timely and effectively identify the heat source, with a fast response time of <0.1 s. In addition, in spatial thermal sensing, the system reliably detects thermal stimuli within discrete regions of each measuring area of <1 × 1 cm 2 . This study provides an effective strategy for temperature sensors in thermoelectric sensing and biomimetic thermoreceptor applications.
研究领域:
材料科学
·
生物医学工程
·
机器人学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Nan Wang,Hui Sun,Xiaodong Yang,Wenbo Lin,Wenyu He,Hao Liu,Gajanan Bhat,Bin Yu
The flexible smart wearable device with low cost and high performance is highly desired but rather challenging. In this work, a wearable temperature sensor was developed by integrating the polybutylene terephthalate melt-blown nonwoven fabric (PBT NW) with reduced graphene oxide (rGO) and carbon nanotubes (CNTs) via a simple mechanical ultrasonication method. The microstructures of the rGO/CNTs@PBT NW sensor were investigated by FT-IR, XRD , and SEM techniques, and the thermal and mechanical properties of this sensor were systematically analyzed. The conductive rGO and CNTs could be tightly fixed to the surface of PBT NW. Compared with original PBT NW, the tensile properties of rGO/CNTs@PBT NW sensor were improved. The results of sensing performance tests showed that the prepared temperature sensor had high sensitivity (−0.737% °C −1 ) and linearity (R 2 =0.98) with a resolution of 0.1 °C between 25 °C and 45 °C, a long-term stability and good circularity indicating that our sensor can meet the monitoring requirement of real-time human body temperature. In addition, this sensor could also be used to monitor human respiratory rate. Our study may provide a new idea for the fabrication of the flexible temperature sensor with nonwoven substratefor monitoring the human body and environment temperature.
研究领域:
材料科学
·
智能穿戴设备
·
传感器技术
✓ 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）