ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yingying Zhang,Guanglin Fan,Jinqiang Jiang,Zhaotie Liu,Zhongwen Liu,Guo Li
Hydrogel actuators have gained considerable interest and experienced significant advancements in recent years. However, the programming of their actuating behaviors is still challenging. Herein, we report the development and regulation of gradient structures of hydrogels for programmable thermally responsive actuating behaviors. The hydrogel actuators are developed by controlling the photoreduction of Fe3+ ions coordinated with carboxylate groups from the substrates and their limited diffusion into the precursor solutions to act as both initiators and crosslinkers. The developed hydrogels show well-defined external geometries and controllable thicknesses under spatiotemporal control of ultraviolet irradiation. The shapes and the actuation amplitudes of the hydrogel actuators can be independently regulated by controlling the formation and photodissociation of Fe3+–carboxylate coordination in the formed gradient networks. Some interesting applications such as the lifting of an object with a specific shape and directional walking are realized. The proposed method can be extended to other hydrogel actuators with different compositions and stimuli-responsive behaviors.
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
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
Functional Materials Letters
·
2023
·
IF 1.3
Jiaxin Li,Ruofei Wang,Diqing Ruan,Huaping Wu,Lin Cheng,Aiping Liu
Responsive hydrogels based on Poly(N-isopropylacrylamide) (PNIPAM) are known to exhibit distinctive thermosensitive properties. However, isotropic PNIPAM hydrogels with weak mechanical properties and low deformation rates tend to exhibit only regular volume expansion/contraction, which limits them to promising applications such as intelligent actuators. In order to prepare programmable hydrogel actuators with satisfactory mechanical properties and fast deformation capability, a polyvinyl alcohol/PNIPAM (PVA/PNIPAM) bilayer hydrogel with anisotropic structure is proposed by combining preprepared PVA polymer film with outstanding mechanical properties as the passive layer and thermosensitive PNIPAM hydrogel as the active layer, forming a semi-interpenetrating network structure at the interface via the hydrogen-bond interaction between PNIPAM and PVA. The microstructures, mechanical properties and actuation behaviors of bilayer hydrogel were studied by scanning electron microscope, Fourier transform infrared spectrograph, mechanical testing machine and actuation test device. Results show that the introduction of PVA can improve the tensile stress of the bilayer hydrogel from 23.6 kPa to 62.6 kPa, and favor the hydrogel actuator excellent actuation preformation with a maximum bending amplitude of 500° and a maximum bending velocity of 13°/s within first 40 s. The bilayer hydrogel is further designed to work as a fluidic system valve that can recognize various temperature solutions and control solution flow rate. This design provides a simple and practical strategy to construct responsive hydrogels with anisotropic structure for further development in the field of intelligent actuators and flexible microfluidic systems.
研究领域:
材料科学
·
生物工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 33
·27485-27493
·
IF 3.289
Yunze Wang,Haibo Lin,Zhu Xiong,Ziyang Wu,Xuemin Yu,Yi Wang,Fu Liu
An interesting PVDF membrane with unusual thermoresponsive behavior was prepared by the incorporation of P(OEGMA-co-VTMOS). The P(OEGMA-co-VTMOS) copolymer was first in situ synthesized in a PVDF/triethyl phosphate (TEP) casting solution. A P(OEGMA-co-VTMOS) network was assembled in the PVDF membrane through hydrolysis and condensation during phase inversion. PVDF/P(OEGMA-co-VTMOS) in organic solvent demonstrated a typical LCST around 35 °C, reflecting the reversible transition of the coil-to-globule conformation. Microphase separation was responsible for the appearance of turbidity of the casting solution. FTIR, XPS, TGA and SEM confirmed the surface enrichment of the copolymer, especially in the membrane bottom. The hydrophilicity and protein anti adsorption were improved despite the temperature variation. In particular, AFM in aqueous media was conducted to determine the reversible morphology and water channel variation under heating and cooling. Different from common thermoresponsive membranes, the so-modified PVDF membranes exhibit a reversible abnormal change of pure water flux and BSA rejection with temperature. The intriguing thermoresponsive behavior and mechanism of the modified PVDF membrane was thoroughly investigated from the aspects of PVDF/TEP casting solution, membrane morphology in aqueous media and water/BSA filtration performance.
研究领域:
材料科学
·
膜技术
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Longchao Guo,Ting Wang,Qingyuan Wang,Wei Feng,Ziyang Li,Shaoqing Wang,Ping Xia,Feng Zhao,Xue Yu
Fluorescent materials have been employed in the field of anti-counterfeiting thanks to their feasible and flexible design approach, visualization feature, and handy identification. However, versatile fluorescent materials are still eager to be developed for advanced information security. Here, an efficient temporal and spatial anti-counterfeiting strategy is proposed with the multi-response behaviors from the as-explored transition metal and lanthanide ions doped BaZnOS phosphors under distinct stimulus. Diverse optical performance of the corresponding phosphor with the irradiation of X-ray, ultraviolet (UV), and near-infrared laser as well as the stimulation of stress and temperature endows a spatial anti-counterfeiting strategy. Moreover, with the cooperation of the photo-stimulated and up-conversion behaviors, a temporal anti-counterfeiting could be achieved elaborately. Herein, this work not only gives an insight to understand the multi-dimensional response of the corresponding tailored phosphor under distinct exterior stimulations, but also provides a feasible and facilitated way to address the counterfeit issues accordingly.
研究领域:
材料科学
·
光学工程
✓ 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
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Yuankun Wang,Wenyuan Xie,Defeng Wu
Two kinds of anisotropic cellulosic nanoparticles, cellulose nanocrystal (CNC) and nanofiber (CNF), were used as additives for the aqueous carbonyl iron particles (CIPs) based magnetorheological (MR) fluids, aiming at disclosing effect of nanocelluloses on the magneto-responsive behavior and stability of MR fluids. Both CNC and CNF can stabilize MR fluids, and improve their sensitivity to alterations of magnetic field strengths. Relative to electrostatic repulsion, physical hindrance is more important to the stability improvement. Thus, CNF is the better option because it has higher aspect ratio and surface charge. Moreover, the presence of cellulosic nanoparticles hinders coalescence of CIP chains to stronger columns, and hence the nanoparticles stabilized MR fluids show thixotropy evidently. At the comparative concentration (0.3 wt%), the presence of CNF even enhances the magneto-responsive levels because the percolated CNF network acts as stress amplifier. This work opens up a new door for applications of nanocelluloses in MR fluids.
研究领域:
材料科学
·
胶体化学
✓ 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
MOLECULES
·
2024
·Vol. 29
·期 21
·5055
·
IF 4.2
Jiaxing Zhang,Qinqin Ma,Huan Wang,Peinan Zhang,Xinyan Su,Afang Zhang,Wen Li
Mimicking nature, the reversible isomerization of hydrophobic dyes in aqueous solutions is appealing for bio-applications. Here, we report on the reversible isomerization of first-generation solvatochromic donor-acceptor Stenhouse adducts (DASAs) in water within dendritic matrices, realized either through the dendronization of DASAs or the incorporation of DASA pendants into dendronized copolymers. These dendritic macromolecules contain three-fold dendritic oligoethylene glycols (OEGs), which afford the macromolecules water-solubility and unprecedented thermoresponsive behavior. The thermoresponsive behavior of both dendronized DASAs and dendronized copolymers is dominated by the peripherals of dendritic OEGs. However, the hydrophilicity of the acceptor from DASA moieties also play a role in mediating their thermal phase transitions, and more importantly, tailor the hydrophobic interactions between dendritic OEGs and DASA moieties. Intriguingly, dendritic topologies contribute confinement to encapsulate the DASA moieties through crowding effects, and cooperative interactions from the crowded dendritic OEGs modulate the DASA moieties with different isomerization in aqueous media. The thermally induced collapse of dendritic OEGs, accompanied by the aggregation of dendritic macromolecules, leads to the formation of hydrophobic domains, which exert enhanced crowding effects to efficiently encapsulate the DASA moieties. Compared to the low molar mass of dendronized DASAs, thermally collapsed dendronized copolymers can efficiently retard the hydration of DASA pendants through cooperation between neighboring dendritic OEGs and afford the DASA pendants with better confined microenvironments to mediate their isomerization recovery by up to 90% from a cyclic charged (hydrophilic) state into a noncharged (hydrophobic) linear state in water. This dendritic confinement exhibits excellent fatigue resistance after several cycles of alternating photo-irradiation and thermal annealing at elevated temperatures.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Zhengli Peng,Mo Zhu,Jinxian Yang,Lianwei Li
In this study, by using a set of narrowly distributed polyethylene glycol (PEG) samples with varied average molar mass (PEG n , 9 < n < 454), we have systematically studied how PEG molar mass and solution concentration influence the thermal response behavior of methyl cellulose (MC) aqueous solutions ( M w = 4.3 × 10 5 g/mol, < R g > = 71 nm) by a combination of isothermal titration calorimetry (ITC), rheometer, UV–vis spectroscopy, laser light scattering (LLS) and atomic force microscopy (AFM). At room temperature , ITC result clarifies the existence of extremely weak hydrophobic interactions between MC and PEG chains. In addition, for MC/PEG mixed solution with shorter PEGs (PEG 22 and PEG 90 ), experimentally measured zero-shear viscosity (η exp ) is confirmed to be 5–10% higher than the theoretical values (η calc ), further supporting the interchain association. Whereas for MC/PEG 454 , insoluble aggregates are formed, which results in η exp < η calc . Further, dynamic laser scattering (DLS) results further reveal how the percentage of peak area of aggregates depends on the chain length of PEG. During the heating process from T = 20 to 70 °C, a combination of UV, LLS and AFM results clearly illustrates that the shorter PEG chains can effectively stabilize the formed MC fibers and prevent the fiber extension; whereas for longer PEG chains, they can not only promote the nucleation process, but also destabilize the formed fibers and promote the fiber extension. Our result unambiguously reveals the macromolecular effect of PEGs on the thermal response behavior of MC in solutions.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Meng-Meng Song,Ya-Min Wang,Bing Wang,Xiang-Yong Liang,Zhi-Yi Chang,Bang-Jing Li,Sheng Zhang
The research of hydrogels has been increasingly focused on designing an effective energy dissipation structure in recent years. Here, we report a kind of novel supramolecular cross-linker, which was formed by self-assembling amphiphilic block copolymers with guest groups at the end and vinyl-functionalized cyclodextrin (CD) through host–guest interaction. These cross-linkers could dissipate energy effectively since they combined multiple sacrificial mechanisms across multiscales through physical interactions. The resulted hydrogel shows distinguishing mechanical properties (fracture toughness of 2.68 ± 0.69 MJ/m3, tension strength of up to 475 kPa, uniaxial stretch over 2100%), remarkable fatigue resistance, and thermal- and light-responsive behaviors.
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 APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Jianrong Zhao,Xinlin Li,Fuxin Liu,Wenying Zhao,Songling Chen
The development of temperature-responsive coated urea from sustainable, environmentally friendly bio-coatings has garnered increasing research attention owing to concerns regarding global food security and environmental sustainability. In this study, naturally derived coated urea with temperature-responsive behavior (SNCU) was fabricated using castor oil/polycaprolactone (PCL2000) blends and isocyanate, nano-SiO 2 and siloxane were employed to enhance its hydrophobicity. Nutrient (N)-release experiments were conducted at various temperatures to explore the temperature-responsive behavior of the coated urea. The temperature-response mechanism and composition of the coated urea were investigated using x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), simultaneous thermal analysis (DSC), and Fourier-transform infrared (FT-IR) spectroscopy. Results indicated that PCL2000 incorporation could produce a block polymer with a two-phase structure consisting of a crystalline and an amorphous phase, and the SNCU exhibited a significant temperature switch at 32.5°C. Moreover, the N-release SNCU longevity increased to 70 days. Therefore, the findings from this work highlight that temperature-responsive SNCU, with its higher N availability, could be suitable for agricultural applications in sustainable, green agricultural development.
研究领域:
农业科学
·
环境科学
·
材料科学
✓ 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）