Organic–Inorganic Hybrid Thin Films Fabricated by Layer-by-Layer Assembly of the Phosphorylated Cellulose Nanocrystal and Imogolite Nanotubes

Li, Linlin; Ma, Wei; Higaki, Yasuki; Kamitani, Kazutaka; Takahara, Atsushi

doi:10.1021/acs.langmuir.8b03107

Cited by 25 publications

(22 citation statements)

References 54 publications

(101 reference statements)

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“…Excess amounts of urea were used to prevent the degradation of cellulose caused by the released phosphoric acid at an elevated temperature. [213,214] Phosphorylation usually takes place in the presence of organic solvents, such as N,N-dimethylformamide (DMF), pyridine, or urea, which are used to swell cellulose fibers to increase the homogeneity of the phosphorylation reaction. Introduced amounts of phosphate groups heavily depend on the amounts of the phosphorylating agents, reaction time and temperature.…”

Section: Negatively Charged Nanocellulosementioning

confidence: 99%

Recent Progress on Cellulose‐Based Ionic Compounds for Biomaterials

Yang

Zeng

et al. 2020

Advanced Materials

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Cellulose and hemicelluloses represent the most abundant biomaterials on the Earth and represent major structural components in cell walls of plant that provide them with sufficient mechanical Glycans play important roles in all major kingdoms of organisms, such as archea, bacteria, fungi, plants, and animals. Cellulose, the most abundant polysaccharide on the Earth, plays a predominant role for mechanical stability in plants, and finds a plethora of applications by humans. Beyond traditional use, biomedical application of cellulose becomes feasible with advances of soluble cellulose derivatives with diverse functional moieties along the backbone and modified nanocellulose with versatile functional groups on the surface due to the native features of cellulose as both cellulose chains and supramolecular ordered domains as extractable nanocellulose. With the focus on ionic cellulose-based compounds involving both these groups primarily for biomedical applications, a brief introduction about glycoscience and especially native biologically active glycosaminoglycans with specific biomedical application areas on humans is given, which inspires further development of bioactive compounds from glycans. Then, both polymeric cellulose derivatives and nanocellulose-based compounds synthesized as versatile biomaterials for a large variety of biomedical applications, such as for wound dressings, controlled release, encapsulation of cells and enzymes, and tissue engineering, are separately described, regarding the diverse routes of synthesis and the established and suggested applications for these highly interesting materials.

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Section: Negatively Charged Nanocellulosementioning

confidence: 99%

Recent Progress on Cellulose‐Based Ionic Compounds for Biomaterials

Yang

Zeng

et al. 2020

Advanced Materials

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“…The thickness of each bilayer is ∼10 nm, slightly larger than that of dip-assisted LBL assembly of polyelectrolyte/imogolite films (which is around several nanometers 23,24 ) and also much larger than the 2 nm thickness of each CNC/imogolite bilayer. 25 This is because, compared with the sparsely surface charged CNC, 34 the densely surface charged sacran has a strong electrostatic attraction with the imogolite, resulting in a larger bilayer thickness. For another tubular clay, halloysite nanotube, in the LBL assembly process, each bilayer thickness of halloysite/ poly(ethylenimine) is about 54 nm, 35 much larger than the sacran/imogolite bilayer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…23,24 For instance, our very recent work demonstrated that imogolite can be employed in the fabrication of LBL films with CNC. 25 However, because of the weak electrostatic attractions and rigidities of both CNC and imogolite, the resulting hybrid film was found to be unstable under harsh conditions, such as acidic solution, and appeared very brittle when peeled from a substrate. Nonetheless, because of the flexible structure, presence of many functional groups, large molecular weight, and the high surface charge of sacran, a free-standing sacran/ imogolite film can be fabricated owing to the strong interaction between imogolite and sacran.…”

Section: ■ Introductionmentioning

confidence: 99%

Structure and Properties of Hybrid Film Fabricated by Spin-Assisted Layer-by-Layer Assembly of Sacran and Imogolite Nanotubes

Takada

et al. 2020

Langmuir

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A free-standing (biomacomolecule/synthetic inorganic nanotubes) hybrid film was fabricated through an alternative layer-by-layer (LBL) assembly of sacran and imogolite nanotubes. Sacran is a natural polysaccharide extracted from the cyanobacterium Aphanothece sacrum, while imogolite is a natural tubular aluminosilicate clay found in volcano ash. The hybrid film thickness increased linearly with the number of the bilayers, because of the interaction between the negatively charged surface of sacran and the positively charged surface of imogolite. UV–vis spectroscopy indicated that the LBL film exhibited good transparency. The surface morphology of the LBL film was smooth in the micrometer scale; many imogolite nanotubes were adsorbed onto the sacran layer, while no imogolite clusters were observed. Furthermore, the structure, stability, gas permeability, and mechanical properties of the LBL films were investigated.

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“…Among them, different types of functional materials based on clay minerals have been also prepared; pillared clays and polymer–clay nanocomposites are the best-known examples [7]. Besides classical layered silicates, clays showing other morphologies, such as fibrous (sepiolite and palygorskite) and tubular (halloysite and imogolite) clays, could also be interesting nanoparticulated solids in this context [8–11]. Sepiolite (SEP) and palygorskite are attracting increasing attention in the development of nanoarchitectured materials in applications such as catalysis or biomedicine [8].…”

Section: Introductionmentioning

confidence: 99%

Multicomponent bionanocomposites based on clay nanoarchitectures for electrochemical devices

Dico¹,

Wicklein²,

Lisuzzo³

et al. 2019

Beilstein J. Nanotechnol.

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Based on the unique ability of defibrillated sepiolite (SEP) to form stable and homogeneous colloidal dispersions of diverse types of nanoparticles in aqueous media under ultrasonication, multicomponent conductive nanoarchitectured materials integrating halloysite nanotubes (HNTs), graphene nanoplatelets (GNPs) and chitosan (CHI) have been developed. The resulting nanohybrid suspensions could be easily formed into films or foams, where each individual component plays a critical role in the biocomposite: HNTs act as nanocontainers for bioactive species, GNPs provide electrical conductivity (enhanced by doping with MWCNTs) and, the CHI polymer matrix introduces mechanical and membrane properties that are of key significance for the development of electrochemical devices. The resulting characteristics allow for a possible application of these active elements as integrated multicomponent materials for advanced electrochemical devices such as biosensors and enzymatic biofuel cells. This strategy can be regarded as an “a la carte” menu, where the selection of the nanocomponents exhibiting different properties will determine a functional set of predetermined utility with SEP maintaining stable colloidal dispersions of different nanoparticles and polymers in water.

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Organic–Inorganic Hybrid Thin Films Fabricated by Layer-by-Layer Assembly of the Phosphorylated Cellulose Nanocrystal and Imogolite Nanotubes

Cited by 25 publications

References 54 publications

Recent Progress on Cellulose‐Based Ionic Compounds for Biomaterials

Recent Progress on Cellulose‐Based Ionic Compounds for Biomaterials

Structure and Properties of Hybrid Film Fabricated by Spin-Assisted Layer-by-Layer Assembly of Sacran and Imogolite Nanotubes

Multicomponent bionanocomposites based on clay nanoarchitectures for electrochemical devices

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