CELLULOSE
·
2018
·Vol. 25
·期 5
·2987-2996
·
IF 3.809
Li Zhaoqian,Qiu Jia,Shi Yu,Pei Chonghua
Wettability-switchable bacterial cellulose/polyhemiaminal nanofiber aerogels were successfully prepared by a facile in situ polymerization of paraformaldehyde and 4,4′-diaminodiphenyl ether. The resultant aerogels displayed an interconnected porous structure, superior porosity, low density as well as hydrophobic–oleophilic properties. The aerogels could not only quickly and efficiently absorb the variety of oils or organic solvents from water, but also completely release the adsorbates in acid aqueous solutions by the aid of wettability switch (from hydrophobicity–oleophilicity to underwater superoleophobicity). Furthermore, the aerogels can continuously collect oils both on the water surface and in water-in-oil emulsions by a peristaltic pump.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 12
·9829-9839
·
IF 2.324
Wang Huiyi,Pang Hao,Wei Daidong,Li Tao,Yong Qiwen,Huang Jianheng,Liao Bing
A novel environmentally friendly method was developed to fabricate hollow core–shell conductive nanoparticles using a natural and nontoxic material, nanocrystalline cellulose (NCC), as the template. The NCC used in this study has nano-scale rod-like structure. After the oxidization to dialdehyde cellulose, the insulated NCC was functionalized by poly(dopamine) (PDA) in weakly alkaline conditions through Schiff base reaction and self-polymerization. The Schiff base can be hydrolyzed in an aqueous acetone solution via ultraviolet radiation so that the hollow structure constructed. This structure not only strengthened the mechanical properties but also provided more active sites for silver deposition. Utilizing the chelating ability of the catechol groups in PDA, electroless plating method was used to form the silver coating layer. Scanning electron microscope and Dynamic Light Scattering measurements indicated that these nanoparticles (NPs) had well-defined morphology and a mean diameter of 100–120 nm. Moreover, these prepared Ag–DA–NCC 0 NPs exhibited excellent conductivity. Their electrical resistivity reached 0.2 mΩ·cm, which is much higher than that of many other conductive particles used in conductive adhesive.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Guihua Yan,Xiuqiang Zhang,Mengzhu Li,Xiaoyu Zhao,Xianhai Zeng,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
The poor solubility of raw cellulose greatly limits its applications. Herein, the periodate oxidation of cellulose was conducted to obtain dialdehyde cellulose (DAC), which is a kind of soluble and configurable cellulosic derivative with great potential applications as a functional material. The oxidation of cellulose included a process of exfoliating the cellulose from its original source, and the particle size was reduced after a prolonged oxidation. The dissolved DAC, solubilized in water by heating, showed an obvious Tyndall phenomenon with a strengthening trend with aging, and the molecular weight decreased sharply at the beginning of aging and then tended to be stable after 3 months. A large change in the freeze-dried DAC solutions with different oxidation degrees, ranging from crystal string beading to hollow microspheres, was explicated by layer peeling during oxidation, while the solution was at a steady state after aging. The special structure of DAC, such as the existence of aldehydes with low molecular weight in solution-based processes and the formation of regular hollow spheres after freeze-drying, enabled it to be used in cosmetics, food, wound dressings, and drug carriers.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 33
·18197-18203
·
IF 2.936
Minglei Chu,Huichang Gao,Sa Liu,Lin Wang,Yongguang Jia,Meng Gao,Miaojian Wan,Chengfang Xu,Li Ren
A series of novel bacterial cellulose/C60 (BCC60) composites was prepared using a original dehydration-rehydration method. The composites were characterized to demonstrate their potential in multifunctional wound dressings for skin cancer treatment using photodynamic therapy. Raman spectroscopy revealed that the C60 nanoparticles were successfully incorporated into the bacterial cellulose (BC) network. Scanning electron microscopy was used to examine the morphology and distribution of the C60 particles as photosensitizers in the bacterial cellulose network, and the C60 particles were uniformly distributed in the hyperfine three-dimensional BC network with diameters less than 100 nm. Reactive oxygen species (ROS) measurements indicated that the BCC60 composites possessed a high ROS generation ability when exposed to light. The antibacterial assessment of the BCC60 composites revealed their ability to inhibit the growth of E. coli and S. aureus and their relationship with light irradiation. In vitro cell experiments also confirmed that the BCC60 composites had low cytotoxicity in the dark, while they exhibited significant cancer cell damage activity under visible light.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 7
·1-8
·
IF 1.434
Song Hai-ming,Zhu Li-jing,Zeng Zhi-xiang,Xue Qun-ji
Cellulose acetate (CA) is a low cost and readily available material widely used in forward osmosis (FO) membranes. However, the performance of pure CA membranes is not good enough in salt separation and the traditional modification methods are generally multistep and difficult to control. In this paper, we reported high performance cellulose acetate (CA) composite forward osmosis (FO) membranes modified with polyvinyl alcohol (PVA) and polydopamine (PDA). PVA was first cross-linked onto the surface of CA membranes, and then PDA was coated with a rapid deposition method. The membranes were characterized with respect to membrane chemistry (FTIR and XPS), surface properties comprising wettability (by water contact angle), and osmosis performance. The modified membrane coated by PVA and PDA shown better hydrophilicity and exhibited 16.72 LMH osmotic water flux and 0.14 mMH reverse solute flux with DI water as feed solution and 2.0 M NaCl as draw solution and active layer facing the feed solution. This simple and highly effective modification method makes it as an excellent candidate for further exploration for FO.
✓ 已验证
产品关联
DOI
高影响因子
CURRENT APPLIED PHYSICS
·
2018
·
IF 2.058
Yizao Wan,Jin Li,Zhiwei Yang,Haiyong Ao,Lingling Xiong,Honglin Luo
In this study, we report the construction of a ternary flexible nanocomposite of bacterial cellulose/graphene/polyaniline (BC/GE/PANI) via a facile two-step strategy. Bacterial cellulose/graphene (BC/GE) is first prepared by a novel in situ membrane-liquid-interface method, in which the three-dimensional continuous BC nanofibers can be maintained and the introduced GE can improve the mechanical properties mainly due to the uniform dispersion of GE in the BC matrix. To construct the effectively interconnected conductive paths between separated GE nanosheets , polyaniline (PANI) is simultaneously deposited on the surfaces of both BC nanofibers and GE nanosheets to obtain BC/GE/PANI with excellent electrical conductivity. It is found that the as-prepared BC/GE/PANI has an electrical conductivity of 1.7 ± 0.1 S cm −1 , which is higher than most of PANI-based composites. It is believed that the BC/GE/PANI nanocomposite possesses great potential for applications in electromagnetic shielding and flexible electrodes.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2018
·
IF 7.9
Wanwu Li,Habiba Khalid,Zhe Zhu,Ruihong Zhang,Guangqing Liu,Chang Chen,Eva Thorin
Lignocellulosic biomass is the most abundant natural resource with high biomethane potential. However, complex structure of lignocellulosic biomass has hampered the efficient utilization of this bioresource. Previous studies have investigated the overall anaerobic digestion performance of lignocellulosic biomass, but the individual participation of each lignocellulosic component during anaerobic digestion remained unclear. Thus, this study investigated the methane production characteristics of cellulose, hemicellulose, lignin and their mixtures along with the microbial communities involved in anaerobic digestion. The results showed that the biomethane potential of cellulose was higher than that of hemicellulose; however, hemicellulose was hydrolysed more quickly than cellulose, while lignin was very difficult to be digested. The higher concentrations of acetic, n -butyric and n -valeric acids hydrolysed from the hemicellulose resulted in a lower pH and more severe inhibition on methane production than that of cellulose, and the methanogenesis gradually recovered after pH adjustment. The co-digestion of cellulose and hemicellulose increased the methane yield and biodegradability compared to mono-digestions. The addition of lignin to cellulose brought more significant decrease in the methane yield of cellulose than that of hemicellulose. Substrate-related bacteria such as Clostridium sensu stricto , Lutaonella , Cloacibacillus and Christensenella showed higher relative abundance in cellulose digestate, and sugar-fermenting bacteria such as Saccharofermentans , Petrimonas and Levilinea were more rich in the digestate of hemicellulose. Moreover, methanogenic Methanospirillum and Methanothrix likely contributed to the methane production of cellulose, while aciduric methanogens from Methanobrevibacter , Methanomassiliicoccus , Methanobacterium and Methanoculleus contributed to that of hemicellulose. This study provides a deeper understanding of the mechanism in the bioconversion of lignocellulosic biomass during anaerobic digestion.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Chenglong Hou,Yusong Wu,Tao Wang,Xinru Wang,Xiang Gao
The substantial increase of the atmospheric CO2 concentration over the last few decades has steered toward research on direct air capture (DAC). DAC is one of the mobile-source carbon capture and storage (CCS) processes that is variant from the conventional point-source CCS in terms of easing the CO2 concentration levels and promoting negative carbon emission. We propose here a sustainable material based on the quaternization of bamboo fiber and the implication in DAC. The quaternized bamboo cellulose could adsorb CO2 at a medium relative humidity (RH) of 60–80%, with the efficiency of quaternary ammonium groups over 0.65. The CO2 capacity at higher RH strikingly decreased, which indicates the moisture-swing characteristics, and that was further validated by a desorption ratio of 0.70 under humid gas purge. The unique phenomenon that a dry atmosphere (e.g., RH < 20%) is not favored by adsorption was revealed and could be attributed to the hydrophobic feature of the sorbent inherited from natural lignocellulose. The results suggest that quaternized cellulose with a low cost may open up new possibilities for the utilization of moisture-swing CO2 adsorbents in damp circumstances.
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5211-5226
·
IF 3.917
Jiang Lang,Li Ke,Yang Huiyu,Liu Xin,Xu Weilin,Deng Bo
Flower-shaped hydromagnesite (MgO-P) and magnesium oxide (MgO) micro spheres were synthesized via precipitation-aging method with and without calcination. The disassociated nano flaky petal of around 50 nm (~ 20 nm in thickness) of MgO-P and MgO by sonication were used as flame-retardants for the electrospun cellulose acetate (CA)/MgO-P or CA/MgO nanofiber. SEM, XRD, FTIR, HRTEM were used to characterize all related products. TGA was used to analyze the detailed decomposition procedures of bare, MgO-P, and MgO doped CA nanofiber. Three evaluation methods including broken time after heating, thermography during heating, and combustion observation were adopted to compare the flame-retardancy of composited nanofibers. Doped CA nanofibers showed best flame-retardancy by extending the heat-induced broken time from 0.46 to 12.09 s, which is 26.3 times that of CA nanofiber. The flame of CA/MgO-P and CA/MgO could be self-extinguished once the ignition source was removed. No smoke and size shrinkage could be observed during the combustion of CA/MgO-P or CA/MgO nanofibers. Corresponding flame-retarding mechanism of Mg-based nano flaky petal was proposed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 37
·47941
·
IF 2.188
Hualei Xie,Yuanfeng Pan,Huining Xiao,Haiyan Liu
Conventional amphoteric and porous materials are often synthetic and polymer based; this tends to raise environmental concerns because of their poor biodegradability. To address this issue, novel natural-polymer- or amphoteric-modified cellulose and MOt (ACeOMt) composite beads with a typical mesoporous structure were developed in this study. These green-based porous beads, consisting of regenerated bagasse cellulose and oxalic acid modified montmorillonite (OMt), were successfully prepared by a facile coagulation method with fine calcium carbonate as a pore-forming agent. The beads with the best sphericity were obtained at a 1:1 weight ratio of cellulose to OMt. Scanning electron microscopy observation showed that ACeOMt possessed a smooth surface with abundant macropores. X-ray diffraction and thermogravimetric analysis characterizations demonstrated the success of the modification of montmorillonite and cellulose. The results of Brunauer–Emmett–Teller analysis indicate the presence of a typical mesoporous structure in the composite with a relatively high specific surface area. The resulting ACeOMt are expected to be biodegradable, nonhazardous, and applicable for various uses, including adsorption, chromatography, and soil remediation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47941.
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2018
·
IF 4.494
Qiang Lu,Bin Hu,Zhen-xi Zhang,Yu-ting Wu,Min-shu Cui,Ding-jia Liu,Chang-qing Dong,Yong-ping Yang
Understanding the fundamental reactions and mechanisms during biomass fast pyrolysis is essential for the development of efficient pyrolysis techniques. In this work, quantum chemistry calculation, kinetic analysis and fast pyrolysis experiment were combined to reveal the cellulose pyrolysis mechanism . During cellulose pyrolysis, the indigenous interior units, reducing end (RE end) and non-reducing end (NR end) initially form various characteristic chain ends and dehydrated units which then evolve into different pyrolytic products. As the rising of the degree of polymerization (DP), reactions occurring at the interior unit and NR end are more competitive than those taking place at the RE end, resulting in distinct pyrolytic product distribution for cellulose and glucose-based carbohydrates. The reactions occurring at the three indigenous units of cellulose chain all favor the formation of levoglucosan-terminated end (LG end) and/or NR end, which then generate levoglucosan (LG). The acyclic d -glucose end (AG end), which mainly derives from the RE end, is essential for the formation of 1,6-anhydro-β- d -glucofuranose (AGF), 1,4:3,6-dianhydro-α- d -glucopyranose (DGP), furfural (FF), 5-hydroxymethyl furfural (5-HMF) and hydroxyacetaldehyde (HAA). Compared with the chain ends, the dehydrated units are not feasible to be generated, and their decomposition favors the formation of HAA.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2018
·Vol. 40
·期 8
·3012-3019
·
IF 1.943
Yaorui Ma,Shaoping Qian,Lang Hu,Jun Qian,Cesar A. Fontanillo Lopez,Linqiong Xu
To improve the surface compatibility between hydrophobic poly(lactic acid) (PLA) and hydrophilic bamboo cellulose nanowhiskers (BCNWs), four commercial available silane coupling agents were employed to modify their interfaces with different concentrations (0, 1, 8, and 16 wt%). PLA/BCNW biocomposite films were fabricated by solution casting. The effects of silylated BCNW on the thermal, mechanical, and morphological properties of PLA biocomposites were investigated. The coupled reaction between coupling agents and cellulose via Si-O-C bonding and hydrogen bonding was confirmed. Both, tensile strength and tensile modulus, decreased with the four silane treatments. The maximum elongation at break values increased to 213.8, 111.3, 255.3, and 209.8% after 16 wt% A-151, 8 wt% A-1100, 8 wt% A-174, and 8 wt% A-189 silane treatments, respectively, with respect to 12.4% of the untreated composite. A wire-drawing phenomenon was observed on the tensile fractural surface. Glass transition temperature and crystallinity decreased after the surface modifications. POLYM. COMPOS., 40:3012–3019, 2019. © 2018 Society of Plastics Engineers
✓ 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）