ACS Applied Polymer Materials
·
2019
·
IF 0
Xiao-Qin Zhang,Di Wu,Jun-Bo Hou,Jun-Feng Feng,Duo Ke,Sheng Zhang,Bang-Jing Li
Materials that can undergo shape deformation have potential applications in biomedical field, yet it has always been a challenge to pattern hydrogels and accurately program target three-dimensional (3D) shapes through a simple method. Here, we develop a facile method that permits fabrication of inhomogeneous hydrogels, which can reversibly deform from planar sheet to 3D shape in response to multistimuli, such as pH values, SLDC (solutions with lower dielectric constant), and SBF (simulated body fluid). By printing NaOH solution ink on classic PAAm hydrogel sheet, the amide side groups of PAAm hydrolyzed to acrylate. The swelling mismatch of the printed and unprinted areas generates internal stress to activate hydrogel deformation. Adjusting concentration of NaOH solution or number of times of printing, it is convenient to introduce in-plane and through-thickness gradient distribution to hydrogel sheet. The inkjet printing process is easily controlled by computer, enabling the direct printing of batched and complicated patterns. Three-dimensional structures, such as helix, tube, and surface of constant Gaussian curvature can be achieved simply.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
Materials Today Communications
·
2022
·
IF 3.662
Jianhua Lv,Yaru Fang,Mi Wu,Xiaoyu Ou,Wenchang Zhang,Shiyu Wang,Huaiguo Li,Lei Shang,Mingfeng He,Yan Zhao
Microsized β-chitin fibers were prepared, and PAAm /β-chitin composited hydrogels were synthesized by situ free radical polymerization . The morphology, mechanical properties, swelling ratio, transparency and drug release capabilities of the composited PAAm hydrogels were studied systematically. The results showed that the microsized β-chitin fibers were evenly dispersed in the PAAm hydrogels, and the tensile and compressive strength of PAAm hydrogels were increased by 2.1 folds and 4.4 folds respectively by adding with 15 phr microsized β-chitin fibers, while water absorbency and transparency of the hydrogels were decreased with higher microsized β-chitin fibers content. The drug release behaviors of diclofenac sodium in the hydrogel followed the Fickian diffusion mechanism with n value of 0.099 and 0.147 for PAAm hydrogels and PAAm/β-chitin composite hydrogels respectively, and the release time of 60 % drug were extended from 1 h to 5 h by the addition of 5 phr microsized β-chitin fibers. The results indicate that microsized β-chitin fibers can improve the mechanical properties and decrease the drug release rate of PAAm hydrogel, and the composited hydrogels may find potential applications in the field of transdermal drug delivery system.
研究领域:
材料科学
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药学
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生物医学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 20
·12632
·
IF 6.208
Bin Chen,Lizhong Yang
Rigid polyurethane foam (RPUF) has been widely used in many fields, but its high flammability and frequent release of large amounts of toxic smoke during combustion limit its application. Hydrogel coatings, as a kind of environmentally friendly material, contain large amounts of water, which is beneficial to flame retardance of RPUF. MXene, as a two-dimensional inorganic nanomaterial, possesses a large specific surface area and good thermal stability, performing well in smoke suppression and as a physical barrier for flammable gas products and heat. Herein, to address the fire hazards of RPUF, MXene nanosheets were first grafted with double bonds, and then introduced into a polyacrylamide hydrogel system by radical polymerization to prepare MXene-based hydrogel coating (PAAm-MXene). The flame-retardant RPUF (coated RPUF) was prepared by painting the PAAm-MXene coating onto RPUF surface. The dispersion of modified MXene nanosheets (m-MXene) in hydrogels is improved compared with pristine MXene, and the addition of m-MXene contributes to the thermal stability enhancement of PAAm-MXene. Cone calorimetry, water retention test, and open flame combustion test were used to study the flame retardancy, smoke suppression, and water retention of flame-retardant RPUF. The coated RPUF exhibited significant flame retardancy, including reduced peak heat release rate (pHRR) at a maximum by 25.8%, and total heat release rate (THR) at a maximum by 24.6%, and total smoke production at a maximum by 38.9%. The results show that both MXene and m-MXene can improve the flame retardancy, smoke suppression, and water retention of hydrogels, but m-MXene has a better smoke suppression effect than MXene. That can be ascribed to the better dispersion of m-MXene than pristine MXene. The detailed performance improvement mechanisms are proposed. This work will not only improve the flame retardancy of RPUF, but also promotes the exploration of new flame-retardant strategies for RPUF.Keywords:rigid polyurethane foams;flame-retardant coating;poly acrylamide hydrogel;MXene;nanocomposites
研究领域:
材料科学
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化学工程
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消防安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Robotics and AI
·
2021
·
IF 0
Li Qi,Wang Luochang,Liu Qihan,Hong Wei,Yang Canhui
Strong adhesion between hydrogels and various engineering surfaces has been achieved; yet, achieving fatigue-resistant hydrogel adhesion remains challenging. Here, we examine the fatigue of a specific type of hydrogel adhesion enabled by hydrogen bonds and wrinkling and show that the physical interactions–based hydrogel adhesion can resist fatigue damage. We synthesize polyacrylamide hydrogel as the adherend and poly(acrylic acid-co-acrylamide) hydrogel as the adhesive. The adherend and the adhesive interact via hydrogen bonds. We further introduce wrinkles at the interface by biaxially prestretching and then releasing the adherends and perform butt-joint tests to probe the adhesion performance. Experimental results reveal that the samples with a wrinkled interface resist fatigue damage, while the samples with a flat interface fail in ~9,000 cycles at stress levels of 70 and 63% peak stresses in static failure. The endurance limit of the wrinkled-interface samples is comparable to the peak stress of the flat-interface samples. Moreover, we find that the nearly perfectly elastic polyacrylamide hydrogel also suffers fatigue damage, which limits the fatigue life of the wrinkled-interface samples. When cohesive failure ensues, the evolutions of the elastic modulus of wrinkled-interface samples and hydrogel bulk, both in satisfactory agreements with the predictions of damage accumulation theory, are alike. We observe similar behaviors in different material systems with polyacrylamide hydrogels with different water contents. This work proves that physical interactions can be engaged in engineering fatigue-resistant adhesion between soft materials such as hydrogels.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Maoqing Tang,Cong Qi,Linfei Yue
As an environmentally friendly seawater desalination method, solar interface evaporation is considered to be a promising solution to ease the freshwater shortage. In this paper, porous Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel was prepared by double chemical crosslinking method using sodium alginate, polyacrylamide and Cu-Fe 3 O 4 nanoparticles with good SPR effect as raw materials. The effects of Cu-Fe 3 O 4 nanoparticle concentration, light intensity and salt water concentration on the evaporation performance of hydrogel evaporator were studied. It was found that under the light intensity of 1 sun, the evaporation efficiency and thermal efficiency of 3.5 wt% seawater in the hydrogel evaporator containing Cu-Fe 3 O 4 nanoparticles with a concentration of 0.26 % can reach 64.7 % and 95.24 %, respectively. In addition, the Cu-Fe 3 O 4 /sodium alginate/polyacrylamide hydrogel evaporator has good reusability and salt self-cleaning ability. The seawater desalination experiment in real environment shows that the hydrogel evaporator with low cost benefit has broad application prospects in the field of seawater desalination.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 85
·69263-69267
·
IF 3.84
Zhaokun Yang,Dongjian Shi,Xiaodong Zhang,Huanhuan Liu,Mingqing Chen,Shirong Liu
Polyacrylamide (PAM) hydrogel photonic crystals with an inverse opal structure were elaborated using a modified vertical deposition approach involving a co-deposition motif. Free-standing inverse opal hydrogel (IOH) films of different thicknesses that could be peeled from the support were first fabricated. A three-dimensional ordered structure without over-layers could easily be acquired by the co-deposition approach. Moreover, the bi-continuous structure was not affected by the increase in film thickness. All these IOH films showed a fascinating pH response property after hydrolysis, and the color change corresponding to the shift of the Bragg diffraction peak of the acquired hydrogel photonic crystal films could be easily distinguished by the naked eye. Three types of IOH films with different thicknesses showed similar pH response properties. The co-deposition approach is found to be suitable for the construction of thicker IOH film without over-layers.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 46
·31982-31992
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IF 10.7
Yizhe Liu,Xiaoxiang Li,Yangzhe Xu,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Seasonal storage of solar-thermal energy within salt hydrate phase change materials (PCMs), which are known for their large latent heat capacity, suitable phase change temperature range and cost-effectiveness, has garnered tremendous attention. Salt hydrates, however, suffer from poor phase change and physical stability, low solar absorptance, and leakage issues after melting. In this work, we report impregnating sodium acetate trihydrate (SAT) within polyacrylamide hydrogel networks decorated with solar-absorbing polydopamine particles, and explore their applications for direct harvesting, long-term storage and controllable release of solar-thermal energy. Owing to the formation of intermolecular hydrogen bonding, the hydrogel-impregnated SAT composites retain their stable supercooling during both long-term heat storage at room temperature for 2 years and repeated heating/cooling cycles. Through applying electrical pulses, the crystallization of supercooled PCM composites and the release of latent heat can be triggered in a programmable manner. The hydrogel networks also prevent phase separation and leakage of melted SATs while retaining a latent heat enthalpy higher than 180 J g−1. We demonstrate that such flexible, self-adhesive, leakage-proof, supercooled PCM composites could not only enable seasonal harvesting of renewable solar-thermal energy and provide intelligent thermal regulation for both buildings and the human body, but also have the potential to facilitate widespread terminal usage of thermal storage technology.
研究领域:
材料科学
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能源技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Xinghui Ai,Qi Zhao,Yujuan Duan,Zhang Chen,Zongtao Zhang,Yu Liu,Yanfeng Gao
To achieve solid-state electrochromic devices, an acceptable compromise is to use polymer electrolyte gels, which combine the merits of liquid and solid electrolytes. However, many drawbacks remain, such as inflammability, a sharp decline in ionic conductivity at zero temperature, and interfacial problems with the electrodes. Here, we introduce a polyacrylamide (PAM)-based hydrogel electrolyte containing a high concentration of zinc ion, which delivers an ionic conductivity of 63.5 mS cm −1 at room temperature and 12.8 mS cm −1 at even −30°C. Based on the PAM-Zn 2+ electrolyte, we prepare a quasi-solid WO 3 /PAM-Zn/Zn energy storage electrochromic bifunctional device by in situ polymerization. The device exhibits excellent cycle performance (retaining 45.1% of optical contrast after 9,200 cycles) and a high areal capacity (278.3 mAh m −2 at 0.1 mA cm −2 ). Furthermore, larger-sized electrochromic devices also show ultra-long cycle stability and attractive anti-freeze properties. This work provides an idea for the large-scale fabrication of anti-freeze electrochromic devices with remarkable lifetimes.
研究领域:
材料科学
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能源存储
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Fuchang Sun,Xiaoyuan Huang,Xiong Wang,Hui Liu,Yanguang Wu,Feipeng Du,Yunfei Zhang
With increasing interest and demand for wearable electronics and healthcare devices, fabricating a conductive hydrogel sensor combining high transparency, self-adhesion and toughness is necessary but remains challenging. In this paper, we developed transparent, adhesive, stretchable and tough hydrogels via semi-interpenetrating network (SIPN) strategy. The SIPN consists of linear poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and chemically cross-linked poly(acrylamide-co-methacrylic acid). Here, methacrylic acid was used to improve the self-adhesion, tensile properties and the electrical conductivity of the hydrogel. The fabricated hydrogels exhibit high transparency, robust adhesion to various substrate surfaces as well as skin, relative high stretchability and tensile strength . Furthermore, the hydrogel also exhibits excellent linear response as a flexible strain sensor to detect human motions and tiny physiological signals. It is envisioned that the SIPN strategy and the introduction of methacrylic acid provide a new way for developing high performance conductive hydrogel for strain sensors.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2015
·
IF 3.562
Ru Cheng,Jie Liu,Peng Xie,Youping Wu,Jianping Deng
Both pH-sensitive hydrogels and chiral hydrogels have evoked large interest in recent years. In the study, we designed and prepared a novel type of hydrogels simultaneously showing pH-sensitivity and chirality . Such hydrogels were prepared by free radical co-polymerization using N -acryloyl- l -alanine as chiral hydrophilic monomer and octadecyl acrylate as hydrophobic monomer, with K 2 S 2 O 8 as initiator and N , N ′-methylenebisacrylamide as chemical cross-linking agent. The obtained hydrogels exhibited remarkable pH-sensitive swelling ability in water. The optical activity of the hydrogels was characterized using circular dichroism spectroscopy. More interestingly, the hydrogels showed enantio-differentiating release ability towards proline enantiomers , in which d -proline was preferentially released. The hydrogels also demonstrated remarkable enantio-differentiating release ability toward chiral drug ibuprofen .
研究领域:
材料科学
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生物医学工程
·
药物递送
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 22
·
IF 1.768
Yanzhao Zhu,Zhongkui Wu,Hanmin Lu,Zhi Yue
In this article, we report a facile strategy for preparing high-mechanical-strength ferrohydrogels containing magnetic nanoparticles homodispersed by a thermodynamically stable Pickering emulsion (PE). After the monomers were mixed with the PE, including methacryloxy propyl trimethoxyl silane emulsified by ferric oxide (Fe 2 O 3 ) nanoparticles as the dispersed phase, hydrogels were synthesized by free-radical polymerization. In contrast to conventional hydrogels crosslinked by a molecular crosslinker, in our new approach, the magnetic PE particles served as individual, multifunctional crosslinkers. Characterizations of the swelling behavior, the mechanical properties, and other properties indicated that our ferrohydrogels exhibited outstanding physical performances that were superior to those of traditional hydrogels and magnetic responsiveness. These ferrohydrogels may have applications in soft and controllable actuators. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41950.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Kaiqiang Wang,Zilin Yue,Xiu Fang,Hong Lin,Lei Wang,Limin Cao,Jianxin Sui,Lei Ju
The development of sensitive and long-term signal-stable plasmonic substrates is vital to the in-field application of the surface-enhanced Raman spectroscopy (SERS) technique. The colloidal gold nanoparticles (AuNPs) system is commonly used in SERS detection, but it shows less signal stability and reproducibility due to the uncontrollable aggregation of nanoparticles by adding aggregating agents in SERS detection. In this study, we developed a new SERS detection platform based on polyacrylamide hydrogel-enclosed plasmonic gold nanoparticle aggregates (PAH-AuANs). In the system, the formation of PAH can rapidly stabilize the gold nanoparticle aggregates, avoiding the over-aggregation or precipitation of AuNPs. With the PAH concentration in the range of 6–10 % and AuNPs at the concentration of 0.2 nM, the resulting PAH-AuNAs platform exhibited both sensitive SERS activity and excellent SERS signal stability. The relative standard deviation of the 4-MBA probe SERS signal collected from the PAH-AuNAs platform was lower than 3 %. The limit of detection for the pesticide thiram was down to 0.38 μg/L with a handheld Raman spectrometer. Moreover, the procedure for preparing the PAH-AuNAs platform was easy to handle, offering a new strategy for in-field detection of environmental contaminants with a handheld Raman spectrometer in the future.
研究领域:
分析化学
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环境科学
·
纳米技术
✓ 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）