MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 11
·2000127
·
IF 4.886
Xuefeng Li,Danni Xu,Hui Wang,Chunjie Gong,Haiyan Li,Yiwan Huang,Shijun Long,Dapeng Li
A versatile ionic crosslink lithography (ICL) approach is reported to achieve geometry transitions of strong polyvinyl alcohol/sodium alginate (PVA/SA) hydrogels in a controllable and programmable manner. Specifically, localized PVA/SA and PVA/SA/Fe 3+ hydrogel domains of significantly different swellabilities (i.e., in-plane gradient) are created by patterning and selective ionic crosslinking of one single type of PVA/SA hydrogel. A simple two-step sequential pre- and free-swelling, or each alone, directs the patterned, inhomogeneous hydrogel to transform in various programmable and quasi-quantitative ways through local bulging and/or global buckling. All types of shape changing are reversible and repeatable due to the reversible nature of ionic coordination in the hydrogel networks. The flexibility and versatility of 3D printing is also demonstrated in creating through-thickness gradient in PVA and PVA/SA hydrogel assemblies with similar morphing capability. The ICL approach developed in this work may help shed some light on developing strong and shape morphing hydrogels as soft sensors and actuators and for potentially biomimetic transformations. The ICL approach may also be transferable to fabrication of many other types of hydrogel materials for similar applications.
研究领域:
材料科学
·
生物医学工程
·
软体机器人
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-10
·
IF 3.9
Chen Xue-Qiang,Xie Lina,Fang Shiqiang,Hu Wenjing,Cao Ming
Ensuring the preservation of fragile artifacts from waterlogged archaeological sites demands the advancement of extraction techniques that uphold both safety and the integrity of historical data. Conventionally employed extraction materials are predominantly applicable to sites exhibiting high soil stability and low moisture content, whereas the recovery of artifacts from waterlogged contexts remains technically challenging. This study explores low-acyl gellan gum as a temporary solidification material for waterlogged archaeological relics, enhancing its efficacy through ionic cross-linking methodologies. The results show that by meticulously regulating the species and concentration of cations—specifically Na + , Mg 2+ , Ca 2+ , or Al 3+ — an improvement in gelling strength can be attained within an optimum range. The gel strength improved with the increase of ion valence, but adding Al 3+ results in local gel aggregation. By adding 3.0 wt% of CaCl 2 , low-acyl gellan gum can form a transparent, stable gel with a compressive strength amplified to 0.11 MPa. In addition, the temporary consolidation and extraction experiment under laboratory conditions shows that Ca 2+ cross-linked gellan gum can effectively carry out temporary solidification and safe extraction of multiple artifacts at waterlogged archaeological sites. This innovation presents a simplified yet potent strategy for excavating fragile artifacts.
研究领域:
考古学
·
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Zede Yi,Xuepei Zhou,Juanli Shen,Shiyu Fu
The wide use of plastic straws has posed a persistent environmental challenge, which promotes the development of sustainable alternatives. In this work, inspired by the hierarchical structures of natural materials, we reported a facile approach to prepare straws with high toughness and good water resistance from microscale and nanoscale cellulose fibers. Pulp fibers from rice stalk were treated to prepare cellulose microfibers (CMF) and cellulose nanofibers (CNF), which were hybridized to form a film and roll up for straws. The straws prepared from both micro- and nano- fibers in ratio of 2:3 (CMF:CNF) show the best overall performance in terms of tensile strength (104.5 MPa), toughness (12.6 MJ/m 3 ) and elongation at break (17.0 %). Besides, the straws further cross-linked with Fe 3+ to enhance the network bindings between hierarchical cellulose fibers and effectively improve the water resistance. The ionic cross-linking treatment with 50 mM Fe 3+ for 2 h resulted in the straws with a water contact angle of ∼126°. The obtained straws can completely disintegrate in natural soil within 45 days. These cellulose-based straws are fully in line with the concept of environmental and ecological sustainability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2021
·Vol. 42
·期 7
·2000701
·
IF 5.734
Shijun Long,Zhihua Ye,Yiqi Jin,Jiacheng Huang,Yiwan Huang,Yonggui Liao,Xuefeng Li
Rewritable information record materials usually demand not only reversibly stimuli-responsive ability, but also strong mechanical properties. To achieve one photochromic hydrogel with super-strong mechanical strength, hydrophobic molecule spiropyran (SP) has been introduced into a copolymer based on ion-hybrid crosslink. The hydrogels exhibit both photoinduced reversible color changes and excellent mechanical properties, i.e., the tensile stress of 3.22 MPa, work of tension of 12.8 MJ m −3 , and modulus of elasticity of 8.6 MPa. Moreover, the SP-based Ca 2+ crosslinked hydrogels can be enhanced further when exposed to UV-light via ionic interaction coordination between Ca 2+ , merocyanine (MC) with polar copolymer chain. In particular, hydrogels have excellent reversible conversion behavior, which can be used to realize repeatable writing of optical information. Thus, the novel design is demonstrated to support future applications in writing repeatable optical information, optical displays, information storage, artificial intelligence systems, and flexible wearable devices.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 7
·1800072
·
IF 2.69
Baoyuan Zhang,Zijian Gao,Guanghui Gao,Wei Zhao,Jiasheng Li,Xiuyan Ren
Double network (DN) hydrogels with high strength and toughness are considered as promising soft materials. Herein, a dual physically cross-linked hydrophobic association polyacrylamide (HPAAm)/alginate-Ca 2+ DN hydrogel is reported, consisting of a HPAAm network and a Ca 2+ cross-linked alginate network. The HPAAm/alginate-Ca 2+ DN hydrogel exhibits excellent mechanical properties with the fracture stress of 1.16 MPa (3.0 and 1.7 times higher than that of HPAAm hydrogel and HPAAm/alginate hydrogel, respectively), fracture strain of 2604%, elastic modulus of 71.79 kPa, and toughness of 14.20 MJ m −3 . HPAAm/alginate-Ca 2+ DN hydrogels also demonstrate self-recovery, notch-insensitivity, and fatigue resistance properties without any external stimuli at room temperature through reversible physical bonds consisting of hydrophobic association and ionic crosslinking. As a result, the dual physical crosslinking would offer an avenue to design DN hydrogels with desirable properties for broadening current applications of soft materials.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 64
·36441-36444
·
IF 2.936
Yang Xiong,Lili Liu,Chengyao Hu,Yawen Huang,Xiuli Zhao,Junxiao Yang
Current low dielectric materials can't be recycled, causing significant serious environmental pollution. In this work, to create a type of recyclable and reprocessable low dielectric materials, pyridine was incorporated into styrene-based polymers by copolymerization. Subsequently, this copolymer was cross-linked by incorporating zinc ions and forming coordination bonds. These resins exhibited low dielectric constant (ε = ∼3) and good tensile strength (∼40 MPa) and modules (∼700 MPa). Meanwhile, these resins can be decrosslinked and dissolved in tetrahydrofuran and be reprocessed at above 200 °C. After 3 cycles of reprocessing, the low ε and mechanical properties of the styrene resins can still be preserved, indicating a good recyclability of these new styrene-based resins.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Ku Shu,Ye-Xiong Huang,Jia-Bing Yu,Xuan Yang,Mei-Dan Luo,Xian-Ping Chen
Applying conductive hydrogels in electronic skin, health monitoring, and wearable devices has aroused great research interest. Yet, it remains a significant challenge to prepare conductive hydrogels simultaneously with superior mechanical, self-recovery, and conductivity performance. Herein, a dual ionically cross-linked double network (DN) hydrogel is fabricated based on K + and Fe 3+ ion cross-linked κ-carrageenan (κ-CG) and Fe 3+ ion cross-linked poly(sodium acrylate- co -acrylamide) P(AANa-co-AM). Benefiting from the abundance of hydrogen bonds and metal coordination bonds, the conductive hydrogel has excellent mechanical properties (fracture strain up to 1420 %, fracture stress up to 2.30 MPa, and toughness up to 20.63 MJ/m 3 ) and good self-recovery performance (the recovery rate of the toughness can reach 85 % after waiting for 1 h). Meanwhile, due to the introduction of dual metal ions of K + and Fe 3+ , the ionic conductivity of conductive hydrogel is up to 1.42 S/m. Furthermore, the hydrogel strain sensor has good sensitivity with a gauge factor (GF) of 2.41 (0–100 %). It can be a wearable sensor that monitors different human motions, such as sit-ups. This work offers a new synergistic strategy for designing a hydrogel strain sensor with high mechanical, self-recovery, and conductive properties.
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 Composites and Hybrid Materials
·
2024
·Vol. 8
·期 1
·1-13
·
IF 23.2
Wang Yilin,Zhang Yuheng,Du Jian,Tao Yehan,Hu Jinwen,lv Yanna,Lu Jie,Fu Chenglong,Wang Haisong,Yuan Zhanhui
Biodegradable natural cellulose-based foams have received increasing attention in the area of logistical transport, construction, healthcare, and chemicals, whereas the flammability and poor mechanical behaviors of foams restricted its application. Herein, a clean production route was proposed to fabricate biodegradable rice straw fiber foam containing ammonium polyphosphate (APP), phytic acid (PA), and iron ions through simple foam molding technology. The introduction of PA and APP as flame retardants acted as an acid source to form phosphorus-containing carbon layers on the surface of the fiber to achieve flame retardant effect. Moreover, the incorporation of iron ions for cross-linking resulted in the formation of Fe 3+ -APP/PA complexes on fibers, which further improved the mechanical properties and flame retardant of the foams. Compared with pristine LCF, compressive strength of LCF/APP-PA/Fe 3+ was improved by 254.6% and 107.9% in XY and Z directions, respectively. The total heat release and smoke release of LCF/APP-PA/Fe 3+ were reduced by 27.1% and 27.4%, respectively. Moreover, the optimized LCF/APP-PA/Fe 3+ possessed well flame retardancy metrics, which can be directly reflected from the self-extinguishing of flame after removing alcohol lamp. This work presented a novel and versatile green approach to improve the strength and flame retardant properties of renewable wood fiber foams. Fiber foams with properties such as lightweight, high strength, flame retardant, and thermal insulation have promising applications in logistics and transport, construction, healthcare, and chemicals.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3371
·
IF 5.076
Yi Qiu,Zhuoqi Wen,Shiliang Mei,Jinxin Wei,Yuanyuan Chen,Zhe Hu,Zhongjie Cui,Wanlu Zhang,Fengxian Xie,Ruiqian Guo
Luminescent copper nanoclusters (Cu NCs) have shown great potential in light-emitting devices (LEDs), chemical sensing, catalysis and biological fields. However, their practical use has been restricted by poor stability, and study on the stability of Cu NCs solid powder along with the mechanism is absent. In this study, stablized Cu NCs powder was first obtained by cation crosslinking method. Compared with the powder synthesized by solvent precipitation method, the stability of Cu NCs powder crosslinked by ionic inducer Ce3+was enhanced around 100-fold. The storage time when the fluorescence intensity decreased to 85% (T85) was improved from 2 h to 216 h, which is the longest so far. The results of characterizations indicated that the aggregation structure was formed by the binding of Ce3+with the capping ligands of Cu NCs, which helped in obtaining Ce-Cu NCs powder from aggregate precipitation in solution. Furthermore, this compact structure could avoid the destruction of ambient moisture resulting in long-lasting fluorescence and almost unchanged physical form. This demonstrated that phosphor, with excellent characteristics of unsophisticated synthesis, easy preservation and stable fluorescence, showed great potential in light sources, display technology and especially in latent fingerprints visualization on different substrates for forensic science.Keywords:copper nanoclusters powder;cation crosslinking method;stability;latent fingerprints visualization
研究领域:
材料科学
·
法医学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 34
·期 2
·691-701
·
IF 3.348
Hai-qiang Zhang,Jiale Zhou,Hai Wang,Dongwei Lan,Yan Peng,Zhi Li,Fangyin Dai
To develop an antimicrobial membrane for wound healing, the blended k-carrageenan (KC)/carboxymethyl chitosan (CMCH) membranes were fabricated through a freeze-drying process together with a dual-ion (Cu 2+ and K + or Cu 2+ and Ca 2+ ) crosslinking approach. The dual-ion crosslinking by Cu 2+ and K + could not only make the membranes compact but could also improve the uptake capacity and mechanical properties of the fabricated membranes. The maximum tensile stress of membranes reached up to 43 MPa and the highest swelling ratio was around 5500%, exhibiting robust moisture retention property. The CMCH and Cu 2+ in blended membranes provided a good antimicrobial property against gram-positive and gram-negative bacteria. Moreover, the fabricated membranes showed good cytocompatibility. These results indicated the fabricated KC/CMCH membranes with dual-ion by Cu 2+ and K + have favorable properties and have a great potential for application in wound healing.
研究领域:
生物材料学
·
医学工程学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yicheng Wang,Guohua Wang,Guoqiang Lu,Qicheng Tian,Jun Nie,Xiaoqun Zhu
Hydrogel tubes (HTs) represent a significant facet of hydrogel morphology. Nevertheless, the continuous, rapid, and facile fabrication of hydrogel tubes remains a formidable challenge. In this study, we introduce a novel technique named as Anterior Growth (AG) for the continuous preparation of HTs. This innovative approach employs air bubbles as guidance to direct the growth of polyvinyl alcohol (PVA) HTs crosslinked by copper ions in alkaline solution. Various factors that affect the sizes of HTs from micrometers to millimeters have been explored, including gauge of needles, air bubble volumes, injection rates, and concentrations of NaOH, copper nitrate and PVA. Single HT with various sizes can be easily fabricated by simply adjusting injection rates. The reversibility of PVA-Cu 2+ crosslinking makes it possible to produce HTs with multiple branches in a convenient way by generating an orifice out of the HT wall and then repeating the growing process. Inspired by plant thigmotropism, HTs can be guided to grow along designed shapes such as different angles and patterns by combination of air bubble and silicone rubble substrates. Remarkably, this method allows HTs to serve as voyagers navigating intricate flow channels with a projected trajectory, indicating the capabilities of patterning and traversing complex channels. To further application, AG allows other materials to prepare HTs such as sodium alginate or more, showcasing excellent practical value.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2011
·Vol. 68
·期 5
·1369-1386
·
IF 1.215
Chen Pei,Chen Xinbing,An Zhongwei
A series of covalently and ionically crosslinked sulfonated poly(arylene ether ketone)s (SPAEKs) were prepared via the cyclocondensation reaction of crosslinkable SPAEKs with 3,3′-diaminobenzidine to form quinoxaline groups, where crosslinkable SPAEKs were synthesized by copolymerization of 4,4′-biphenol with 2,6-difluorobenzil, 4,4′-difluorobenzophenone, and 5,5′-carbonyl-bis(2-fluorobenzene sulfonate). The SPAEK membranes had high mechanical properties and the isotropic membrane swelling. The covalent and ionical crosslinking significantly improved the membrane performance, i.e., the crosslinked membranes showed the lower membrane dimensional change, lower methanol permeability, and higher oxidative stability than the corresponding uncrosslinked membranes, with keeping the reasonably high proton conductivity. The crosslinked membrane ( CK3 ) with measured ion exchange capacity of 1.62 mequiv g −1 displayed a reasonably high proton conductivity of 110 mS/cm with water uptake of 33 wt% at 80 °C, and exhibited a low methanol permeability of 1.7 × 10 −7 cm 2 s −1 for 32 wt% methanol solution at 25 °C. The covalently and ionically crosslinked SPAEK membranes have potential for polymer electrolyte membrane fuel cells and direct methanol fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）