OPTICAL MATERIALS
·
2023
·
IF 3.9
Xinhai Lv,Hongye Yan,Zhenbang Wang,Jianrong Dong,Chang Liu,Yu Zhou,Hongxiang Chen
Photo-responsive polymers, obtained by incorporation of photochromic azobenzene groups into polymer, can display reversible photoactuation behavior. However, the damage can cause a reduction in their service scope or service lifetime. It remains a challenge to design healable and reprocessable azobenzene-containing polymers. The polyaddition of isophorone diisocyanate (IPDI) with p -diaminoazobenzene (DAAB) and amino-terminated poly(propylene glycol) (D2000) was performed to prepare the main-chain polyurea elastomer . The hydrogen bonding between urea groups can enhance self-healing of polyurea elastomer, but its influence on photo-responsive behavior of polyurea elastomer is not clear. The proportion of ordered hydrogen bonds was regulated by changing azobenzene content and the ratio of hard/soft segments. The ordered hydrogen bonds played a fundamental role in the maximum peak intensity of polyurea, while they had no direct effect on the photo-responsive efficiency of polyurea. This study provides a feasible way to obtain healable and reprocessable azobenzene-containing polymers.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2024
·
IF 4.6
Jianbo Wu,Minggang Yang,Yibo Huang,Yuan Zhang,Ben Wu,Shi Qiu,Feiyang Hong,Ye Gao,Zhuo Wang,Guocheng Wang
The poor clinical performance of titanium and its alloy implants is mainly attributed to their lack of antibacterial ability and poor osseointegration. The key and challenge lie in how to enhance their osteoinductivity while imparting antibacterial capability. In this study, a titanium oxide metasurface with light-responsive behavior was constructed on the surface of titanium alloy using an alkaline–acid bidirectional hydrothermal method. The effects of the acid type, acid concentration, hydrothermal time, hydrothermal temperature, and subsequent heat treatments on the optical behavior of the metasurface were systematically investigated with a focus on exploring the influence of the metasurface and photodynamic reaction on the osteogenic activity of osteoblasts. Results show that the type of acid and heat treatment significantly affect the light absorption of the titanium alloy surface, with HCl and post-heat-treatment favoring redshift in the light absorption. Under 808 nm near-infrared (NIR) irradiation for 10 min, in vitro antibacterial experiments demonstrate that the antibacterial rate of the metasurface titanium alloy against Staphylococcus aureus and Escherichia coli were 96.87% and 99.27%, respectively. In vitro cell experiments demonstrate that the nanostructure facilitates cell adhesion, proliferation, differentiation, and expression of osteogenic-related genes. Surprisingly, the nanostructure promoted the expression of relevant osteogenic genes of MC3T3-E1 under 808 nm NIR irradiation. This study provides a method for the surface modification of titanium alloy implants.
研究领域:
生物医学工程
·
材料科学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Qingqing Yang,Jinye Wang,Liping Huang,Wei Song,Liang Ding
The properties of synthetic polymers are influenced by the connection mode of polymer chains even polymers made from the same monomer. In this work, the diverse composition systems of cyclooctene-based alternating, random and block azo-copolymers containing imidazolium cation units as side group were successfully achieved based on different metathesis methods in the ionic liquid with good control over the polymerization processes. All these ionic azo-copolymers were tailored to explore the effects of monomers sequences and non-covalent interactions on photoresponsive behaviors and self-assembly morphologies. Since the special alternating structure, UV-light-triggered the shackling trans → cis photoisomerization transition was observed, ultimately spontaneously forming highly regular and uniform polymer vesicle with recoverable size variation in THF directly. Differently, the micellar characterization was carried out by the self-assembly of ionic block azo-copolymers in a selective solvent of toluene to obtain spherical micelle with reversible shape evolution considering nearly 86 % trans→cis relative isomerization efficiency. These interesting results not only demonstrate the diversity of metathesis polymerization but also expand the property of azo-copolymers.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
NANO
·
2016
·
IF 0.951
Dehui Li,Chen Zhang,Yajie Zhang,Weichen Qi,Jinxiang Dong,Jing Yang,Zhidong Qiu
Nearly monodisperse bullet-like Cu 3 ZnInSnS 6 (CZITS) nanocrystals with wurtzite structure were successfully synthesized through optimized noninjection method. The structure, composition, morphology and optical properties of CZITS nanocrystals were characterized by X-ray diffraction, energy dispersive spectrometry, transmission electron microscopy and UV-Vis–NIR absorption. Their suitable bandgap and photoresponsive behavior indicate a high potential application in the field of solar cells. The growth mechanism of the as-synthesized CZITS nanocrystals was preliminarily discussed. It was found that the formation of CZITS could be separated into two steps: nucleation of Cu 7 S 4 and growth of the CZITS main body.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Yuxuan Zhang,Songhao Pei,Yongpeng Wang,Zengduo Cui,Na Li,Ye Zhu,Haibo Zhang,Zhenhua Jiang
A series of azobenzene-containing side-chain poly(ether sulfone)s (azo-PES) with various spacer lengths (2, 6 or 12 methylene units) were successfully synthesized via a nucleophilic substitution grafting reaction between poly(ether sulfone)s with hydroxylphenyl side groups and azobenzene monomers . Their chemical structures and properties were characterized by means of IR, UV–vis and 1 H NMR. These azo-polymers show good thermal stability with glass transition temperatures and 5% weight-loss temperatures above 119 °C and 347 °C, respectively. The results of photoisomerization experiments indicated that azo-PES polymer with longer spacers correspond to higher photoisomerization rates. Upon irradiation with a 532 nm neodymium doped yttrium aluminum garnet (Nd:YAG) laser beam, they presented remnant values of birefringence larger than 82% of the saturation value of birefringence, indicating the good stability of the photoinduced orientation. No fatigue phenomena have been observed after several cycles of inscription–erasure–inscription sequences.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2021
·Vol. 3
·期 3
·172-179
·
IF 0
Zhu Miaomiao,Wang Weijie,Zhang Caihong,Zhu Liping,Yang Shuguang
Abstract Two azobenzene compounds, Disperse Red 1 (DR1) and 4-aminoazobenzene (Aazo), were separately linked to poly(acrylic acid) (PAA) side chains to form PAA-DR1 and PAA-Aazo, which were then associated with poly(ethylene oxide) (PEO) to produce hydrogen-bonded polymer complex fibers. After UV irradiation, the initial modulus and yielding strength of PAA-Aazo/PEO fiber were both increased tremendously, while the mechanical properties of PAA-DR1/PEO fiber only slightly changed. After drawn and dried in vacuum, PAA-DR1/PEO and PAA-Aazo/PEO fibers with an extended length exhibited a contraction of 20% and 25% under UV irradiation, showing potential for photo-actuation. Graphic Abstract
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 26
·13953-13961
·
IF 7.443
Li Yu,Qian Wang,Jian Sun,Chenyue Li,Cheng Zou,Zemin He,Zhendong Wang,Le Zhou,Lanying Zhang,Huai Yang
Utilizing the distinct photoresponsive behaviour of p-aminodiphenylimide and multi-walled carbon nanotubes, we design a wavelength-selective multicomposite featuring remotely controlled, micro-localized and photo-manipulatable shape-memory behaviors based on three typical segments that are neat epoxy, and the p-aminodiphenylimide/epoxy and multi-walled carbon nanotube/epoxy composites. Herein, p-aminodiphenylimide and multi-walled carbon nanotubes not only act as photoabsorbers and heat sources to induce the shape-memory effect but also as functional components to manipulate shape-memory behavior. In our concept, the quantity of temporary shapes and shape recovery process in the shape-memory cycle can be accurately controlled by a photo-manipulation procedure. Moreover, only one switching domain with sharp thermal transition and a simple shape programming process, similar to those for thermal-responsive dual-shape shape-memory polymers, are required to enable the wavelength-selective multicomposite to present triple- or multi-shape-memory effects. This strategy can be put forward for applications of shape-memory polymers and can be applied in other stimulus-responsive systems to generate complex structures.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Haoyu Ma,Xiaoling Niu,Wenlong Qu,Yongliang Liu,Zhen Feng,Shengbo Zhu
Aggregation induced emission luminogens (AIEgens) as one of the optimal alternatives for designing stimuli-responsive fluorophores for real-life applications have sparked much current interest in smart materials design. Herein, the “Star molecules” in AIEgens of α-cyanostilbene and Tetraphenylethylene (TPE) derivatives were constructed into one molecular, namely DC-TPE-tBu and DC-TPE-CN. Both compounds exhibited significant AIE properties. Moreover, the two compounds could change their luminescent colors and intensities under the stimulation of external mechanical force and UV light, showing excellent mechanochromic luminescent (MCL) and remarkable photo-responsive behaviors, respectively. The stimuli responsive mechanisms were investigated by powder X-Ray diffractometer (PXRD) spectra and density functional theory calculations (DFT). The MLC behaviors were associated with the crystalline-to-amorphous transitions after mechanical grinding. These remarkable features make them suitable for the application of mechano/photo-sensors. The studies provide a useful strategy for developing AIE-active functional materials.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Quan Yan,Bai-Liang Xue,Xiaojie Xie,Wenliang Wang,Xin-Ping Li,Xiaojun Shen,Xianzhi Meng,Wei Zhao
The valorization of lignin into high-performance polymeric materials remains a significant challenge, primarily due to the inherent complexity of conventional synthetic methodologies and the non-reprocessable nature of derived polymers. In this study, we present a convenient one-pot strategy to access fully bio-based lignin-integrated polymers endowed with reprocessability. This approach leverages the side reaction, free radical termination, during the synthesis of star-shaped lignin graft copolymers via radical polymerization, enabling the initial formation of a primary permanent network and concurrently enhance monomer utilization (95.6% conversion vs. 62.1% in conventional star polymer). Subsequently, carboxylic acid-terminated poly(lactic acid) oligomers are employed as green cross-linking agents to establish a secondary adaptive network via transesterification reactions. The resulting dual-network polymers exhibit tunability in mechanical properties and excellent reprocessability while retaining structural integrity. Notably, these dual-network systems demonstrate an 18.5±1.9-fold enhancement in mechanical strength compared to their linear polymer counterparts. Moreover, these materials demonstrate remarkable super hydrophobicity (contact angle >108°), enhanced thermal stability, and distinctive light-responsive behavior. This work presents a paradigm-shifting methodology that strategically repurposes side-reaction pathways to synthesize sustainable polymers, advancing the development of sustainable materials for circular economies.
研究领域:
高分子科学
·
材料工程
·
绿色化学
·
可持续材料
·
生物大分子
·
化学合成
✓ 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）