CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Shenjie Han,Shaoyi Lyu,Zhilin Chen,Feng Fu,Siqun Wang
Cellulose nanocrystals (CNCs) combined with styrene-maleic anhydride (SMA) as stabilizers were used to stabilize paraffin droplets for fabricating paraffin/melamine-urea-formaldehyde (MUF) microcapsules. Effects of mixed emulsifier of CNCs and SMA on the morphologies, chemical structures, and properties of paraffin/MUF microcapsules were characterized by Field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC), and paraffin leakage rate test. The results showed that using CNCs alone as emulsifier did not work in manufacturing paraffin/MUF microcapsules, but mixed emulsifier of CNCs and SMA was suitable. When CNCs and SMA each account for 50 % of the mixed stabilizer, the phase change latent heat values of melting and crystallization of MicroC5S5 were about 123.6 J/g and 118.4 J/g, respectively. This demonstrates that CNCs can be mixed with SMA to stabilize paraffin droplets in situ polymerization and reduce the need for surfactants.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Kai Wu,Luping Yu,Chuxin Lei,Jiexin Huang,Dingyao Liu,Yang Liu,Yangsu Xie,Feng Chen,Qiang Fu
Personal cooling technology using functional clothing that could provide localized thermal regulation instead of cooling the entire space is regarded as a highly anticipated strategy to not only facilitate thermal comfort and human health but also be energy-saving and low-cost. The challenge is how to endow textiles with prominent cooling effect whenever the wearer is motionless or sportive. In this study, high content of edge-selective hydroxylated boron nitride nanosheets (BNNSs) up to 60 wt % was added into a biodegradable cellulose/alkaline/urea aqueous solution, and then regenerated cellulose (RCF)/BNNS multifilaments were successfully spun in a simple, low-cost, and environmentally friendly process, which was demonstrated to serve as both static and dynamic personal cooling textile. Typically, excellent axial thermal conductivity of RCF/BNNS filament rendered that body-generated heat could directly escape from skin to the outside surface of the textile by means of thermal conduction, achieving a much better static personal cooling result through continuous thermal radiation. Besides, synergistic effect between excellent heat dissipation capability and good hygroscopicity also resulted in much better dynamic cooling effect once the wearer is doing some sports, whose efficiency was even better than commercial hygroscopic textiles such as cotton and RCF.
研究领域:
材料科学
·
纺织工程
·
热管理
·
可持续技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Zhaodong Zhu,Shiyu Fu,Lucian A. Lucia
Microparticle annular structures resembling “donuts” were obtained from spray drying of cellulose nanocrystal suspensions by addition of lignin. The formation of the donut and its accompanying pit were from the hydrophobicity of lignin that increased water evaporation kinetics during spray drying and decreased ability of water storage inside the microparticles. Indeed, the water inside the microsphere burst the center of the microsphere as verified by fluorescence imaging in which lignin was demonstrated to be concentrated in the center of the annular microsphere; although it was distributed throughout the microsphere, water on the surface of the hydrophobic lignin evaporated faster than on the surface of cellulose nanocrystals (CNC) so that the solid lignin shrank faster than CNC during material aggregation and preferentially concentrated in the center of the microparticle. The particles were modified with a hydrophobic agent, methyltrimethoxysilane (MTMS) and mixed with polydimethylsiloxane (PDMS) to prepare superhydrophobic coatings that greatly depended on the dosage of lignin during particle preparation.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE RESEARCH
·
2022
·
IF 2.975
Mingyu Yang,Zechun Liu,Jianping Zhang,Xiaolan Zhu,Wei Xie,Hongqiao Lan,Yanjun Huang,Xin Ye,Jun Yang
Cellulose and pectin are the important components of tobacco ( Nicotiana tabacum L.) cell wall, which affect the formation of undesirable compounds. Their contents are closely related to the harmfulness of tobacco. But the simultaneous quantitative analysis of cellulose and pectin is hard to be achieved for traditional analytical methods. A solid-state 13 C cross-polarization by multiple contact periods (multiCP) NMR method was developed for the simultaneous quantification of cellulose and pectin in tobacco. The multiCP spectrum at optimal parameters agreed well with the direct polarization (DP) spectrum within one-thirtieth of the measurement time and provided satisfactory signal to noise ratio (SNR). After three simple procedures of sample preparation and spectra deconvolution, simultaneous quantification of cellulose and pectin extracted from tobacco was effectively achieved. Compared with the chemical method, this interesting method was rapid, practicable, and very promising, which provided the technical support for the simultaneous quantification of cell wall substances in biological sample.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Shufang Li,Yi He,Xian Ye,Xuejiao Fu,Yue Hou,Huafeng Tian,Jin Huang,Lin Gan
Self-powered piezoelectric sensors based on cellulose nanocrystal (CNC) porous materials are light-weight and portable, whereas using unmodified CNCs can hardly obtain enough piezoelectric properties without external strong polarization due to its irreversible deformation caused by low toughness. Here, we bonded rod-like CNCs with a soft polymer, poly ethylene glycol (PEG), and hypothesized that PEG could toughen the material and its dielectric signal could induce the CNC polarization. We further adsorbed graphene (GR) as surface electrodes to prepare a CNC-PEG-GR piezoelectric porous material with density of 0.096 g·cm −3 . The voltage output reached maximum when the frequency matched the dielectric relaxation frequency of PEG. We also increased the length-diameter ratio of porous material pores from 1.1 to 3.3 by adjusting its freeze-drying process, and the voltage output could reach to 0.7 V at a moderate ratio. They could be conveniently integrated into portable self-powered sensors applied to the intelligent wearable electronic devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xiuping Chen,Yiming Li,Lin Xu,Dan Zhang,Yihao Guan,Limei Dong,Mutai Bao,Zhining Wang
Frequently occurring oil spill accidents have caused tremendous pollution of the ecological environment. Although various oil–water separation strategies have been developed, the design of efficient oil–water separation materials still remains a significant challenge. In this study, we report a controllable and scalable method for the fabrication of wettability-switchable membranes (MCPP) that achieved a smart temperature response and efficient emulsion separation. The pore structure of the membrane was precisely controlled by the amount of natural microfibril cellulose and MnO2 nanowires. The tensile strength of the membrane was significantly increased to 2.4 MPa with the introduction of poly(vinylidene difluoride). The temperature sensitivity of poly(N-isopropylacrylamide) resulted in a reversible wettability switch of the MCPP membrane, achieving temperature-controlled smart separation for emulsions. Interestingly, the excellent photothermal conversion properties of MnO2 nanowires realized the switch of membrane surface wettability and oil viscosity reduction, further increasing the emulsion separation performance. The MCPP membrane shows high separation permeance (O/W, 4300–5000 L m–2 h–1 bar–1; W/O, 5000–17000 L m–2 h–1 bar–1) and separation efficiency (>99.4%) for a variety of emulsions. The scalable preparation, smart temperature-sensitive wettability switch, excellent emulsion separation performance, and good reusability provide the basis for the practical application of this membrane in water purification fields.
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Qian Sun,Jin Yang,Zulin Da,Yongsheng Yan
With the rapid development of the chemical industry, oil/ water emulsion separation is receiving global attention. It is particularly important to find a low-cost, convenient, economical and environmentally friendly method to prepare superhydrophilic/ underwater superoleophobic membranes for oil/ water emulsion separation. In this paper, discarded cigarette butts were used as raw materials, combined with chitosan to form a superhydrophilic/ underwater superoleophobic membrane through a phase inversion method. The performance of CA/CS membrane is controlled by adjusting the ratio of cellulose acetate and chitosan. The cigarette butts are washed in ethanol solution to remove impurities to obtain cellulose acetate, and then chitosan and polyvinylpyrrolidone (PVP) are added to build the micro–nano structure on the surface of the membrane. The prepared CA/CS composite membrane was superhydrophilic/ underwater superoleophobic. For the oil-in-water emulsion, the filtrate of the CA/CS membrane can hardly see the oil droplets through electron microscope. CA/CS membrane has a higher emulsion permeation flux (more than 340 L m − 2 h − 1 ) and a higher separation efficiency (more than 97.1%). In addition, the membrane has good reusability within 10 cycles. This method can reduce the harm of cigarette butts to nature and can also be used for oil–water separation. The method of turning discarded cigarette butts into treasure is worthy of social advocacy.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yabi Yang,Shuang Liu,Guoliang Zhang,Ziqing Hu,Liang Jin,Bingqing Quan,Xiaoyun Hao,Hao Wu,Xiaofan Ji,Xiang Lu
The design of cellulose nanofiber (CNF)-encapsulated polyethylene glycol (PEG)-based phase change composites (PCCs) has shown great promise toward overcoming the phase transition process’s leakage. Whereas, the leakage is inescapable for intricate industrial occasions such as extrusion and collision. Thereby it’s requisite to monitor the products’ leakage. Herein, a fluorophore with aggregation-induced emission (AIE) effect was employed to prepare fluorescent PCCs. In detail, Pmix2 was picked to dip into the skeleton CNF6 to construct CNF6/Pmix2 with dim green. What’s more, the free fall of 500 g weight, 983 times of CNF6/Pmix2′s weight, was applied to the materials to simulate the possible force that occurred in real industrial processes. Obviously, CNF6/Pmix2′s leakage is seen on dark occasions, whereas CNF6/PEG’s leakage trace is hardly observed, evidencing CNF6/Pmix2 possesses the capacity of monitoring leakage. Additionally, CNF6/Pmix2 displays excellent thermal energy storage and reusability, illustrating promising energy conversion and storage applications.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Kaiyue Zhang,Di Wu,Limin Chang,Wenhao Duan,Yong Wang,Wenjuan Li,Jianglei Qin
The application of biodegradable hydrogels in medical field has drawn great attention because their networked structure provided ideal spaces for drug loading and cell growth. In this research, the boronic acid was coupled onto carboxyethyl cellulose (CMC) to synthesize boronic acid grafted CMC (CMC-BA) conveniently and self-healing hydrogel was fabricated with polyvinyl alcohol (PVA) crosslinking through dynamic boronic ester bond. The CMC-BA/PVA hydrogel showed good biocompatibility and could be degraded by cellulase and in vivo . The hydrogel formed fast fit for localized injection to cover the irregular wounds and localize the antitumor drugs to the tumor site. The in vivo wound repairing experiment revealed the hydrogel could form airtight adhesion to the wound site to reduce blood loss and accelerate the wound repairing rate. The hydrogel as a drug release carrier also reduced the acute in vivo toxicity of DOX with antitumor performance well preserved through a controlled release profile. Based on the above advantages, the CMC-based hydrogel with boronic ester connection should have great potential in biomedical areas with profitable future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xinjie Chen,Jian Lin,Hanwei Wang,Yushan Yang,Chao Wang,Qingfeng Sun,Xiaoping Shen,Yingying Li
Developing affordable and effective carbon dioxide (CO 2 ) capture technology has attracted substantial intense attention due to the continued growth of global CO 2 emissions. The low-cost and biodegradable cellulosic materials are developed into CO 2 adsorbent recently. Epoxy-functionalized polyethyleneimine modified epichlorohydrin-cross-linked cellulose aerogel (EBPCa) was synthesized from alkaline cellulose solution, epoxy-functionalized polyethyleneimine (EB-PEI), and epichlorohydrin (ECH) through the freezing-thawing processes and freeze-drying. The Fourier transform infrared spectroscopy confirmed that the cellulose aerogel was successfully modified by EB-PEI. The X-ray photoelectron spectroscopy analyses confirmed the presence of N 1s and Cl 2p in EBPCa, meaning that the chlorine of ECH and the amino groups of EB-PEI exist in the cellulose surface. The obtained sample has a rich porous structure with a specific surface area in the range of 97.5–149.5 m 2 /g. Owing to its uniformly three-dimensional porous structure, the sample present preferable rigidity and carrying capacity, which 1 g of sample could easily carry the weight of a 3000 ml Erlenmeyer flask filled with water (total 4 kg). The sample showed good adsorption performance, with a maximum adsorption capacity of 6.45 mmol/g. This adsorbent has broad prospects in the CO 2 capture process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Chuanwei Lu,Yi Shen,Xinyu Wang,Shijian Xu,Jifu Wang,Qiang Yong,Fuxiang Chu
Fabrication of ultra-strong, ultra-tough, sustainable, and degradable bio-based composites is urgently needed but remains challenging. Here, a biomimetic sustainable, degradable, and multi-stimuli responsive cellulose/PCL/Fe 3 O 4 composite with ultra-strong mechanical strength and ultra-high toughness was developed. To prepare the proposed composites, the soft poly(ε-caprolactone) (PCL) side chain was grafted onto the rigid cellulose backbone, then the cellulose graft copolymer (EC- g -PCL) reacted with rigid hexamethylenediamine modified Fe 3 O 4 nanoparticle (Fe 3 O 4 -NH 2 ) to construct the crosslinking network using MDI-50 as a crosslinker. Given by the construction of crosslinking network and the “hard” and “soft” interactive structure, the composites showed ultra-strong mechanical strength (25.7 MPa) and ultra-high toughness (107.0 MJ/m 3 ), and the composite specimen could lift a weight of approximately 21,200 times its mass. The composites also exhibited rapid degradation ability with high degradation efficiency. In addition, the composites showed excellent thermal responsive shape memory property with a shape recovery ratio above 96 %. Most importantly, the Fe 3 O 4 nanoparticles endowed the composites with photothermal conversion property, the composites exhibited superior NIR light-triggered shape memory capability. The EC- g -PCL/Fe 3 O 4 composites with ultra-strong mechanical strength and ultra-high toughness have promising applications in heavy-lift, object transportation, and self-tightening knots.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hui Liu,Haoyuan Li,Siyuan Xia,Shanshan Yu,Yujie Duan,Lei Wang,Hongxiang Zhu,Hui He
The monitoring of intracellular pH value is beneficial for the early diagnosis and treatment of some diseases. Here, a cellulose nanocrystal (CNC)-based upconversion ratiometric fluorescent nanoprobe for pH monitoring and imaging was constructed by chemicaliy bonding the upconversion nanoparticles donor and fluorescein isothiocyanate and rhodamine B acceptors using CNC as a bridge. The CNC bridge could improve stability and solve the problems of aggregation-caused quenching of dye on the donor surface, long donor-to-acceptor distance, and poor water dispersibility of the probe. The probe with a double internal reference of donor and rhodamine B acceptor exhibited excellent selectivity, sensitivity and visualization for intracellular pH of 5.0–7.4 with 980 nm excitation. Interestingly, the chameleon-inspired biocompatible probe based on the luminescent resonance energy transfer platform enhanced the depth of penetration and demonstrated excellent pH monitoring and imaging in living cells and in vivo . Therefore, it has promising application for the early diagnosis and treatment of some diseases.
✓ 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）