Chiral nematic porous germania and germanium/carbon films

Xu, Jing; Nguyen, Thanh‐Dinh; Xie, Kai; Hamad, Wadood Y.; MacLachlan, Mark J.

doi:10.1039/c5nr02520f

Cited by 29 publications

(22 citation statements)

References 77 publications

(170 reference statements)

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“…(See Figure S1 for a detailed view of the SWCNT distribution within the cellulosic matrix.) During the dispersion of CNCs with SWCNTs in water, the long-range electrostatic repulsion forces between negatively charged CNCs can keep carbon nanotubes well-dispersed in the solution, allowing the nanohybrid constituents to remain dispersed in water without aggregation and further precipitation (indeed, several works have used CNC as dispersing agents for SWCNTs). , Upon solvent drying and subsequent coassembly of CNC with SWCNTs through EISA, this favorable dispersion state can be kept to yield solid films with well-dispersed conducting nanotubes. , …”

Section: Resultsmentioning

confidence: 99%

Effect of SWCNT Content and Water Vapor Adsorption on the Electrical Properties of Cellulose Nanocrystal-Based Nanohybrids

et al. 2020

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Cellulose nanocrystal (CNC)-based free-standing conductive films were prepared by introducing different contents of single-walled carbon nanotubes (SWCNTs) by an evaporation-induced self-assembly (EISA) process, using water as the sole solvent. The effect of SWCNT content on the morphology, thermal stability, and electric and dielectric properties of CNC films has been studied by field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). In order to investigate the effect of SWCNTs on the conduction mechanism of biobased nanohybrids, a detailed study on electrical and dielectric properties was conducted in DC and AC modes. The influence process parameters in terms of the dispersing agent and sonication method and the specific storage humidity conditions (RH = 0, 53, and 75%) were thoroughly investigated. The results arising from AC impedance spectroscopy were analyzed with respect to phase angle θ, the impedance imaginary part, and Nyquist plots, revealing the pivotal role of both SWCNT concentration and relative humidity in the electrical properties of nanohybrids. As a result, this work sheds light on the conducting mechanism of films based on cellulose nanoparticles in the presence of carbonaceous nanofillers.

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Section: Resultsmentioning

confidence: 99%

Effect of SWCNT Content and Water Vapor Adsorption on the Electrical Properties of Cellulose Nanocrystal-Based Nanohybrids

et al. 2020

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“…Comprehensive work in the MacLachlan lab has demonstrated the potential to incorporate both hydrophilic and hydrophobic polymers into chiral nematic CNC films by either dispersing them in water, [ 108,109 ] polar organic solvents, [ 110 ] or a mixture of both. [ 111 ] Additionally, either the polymer matrix or the CNC template [ 112 ] may then be selectively removed to yield mesoporous materials with chiral nematic structure ( Figure ). [ 113 ] This technique is extremely versatile, as material properties are readily tailored by manipulating variables including polymer type, drying conditions, post‐processing, and subsequent loading of new materials.…”

Section: Nanocellulose Alignment‐induced Structuringmentioning

confidence: 99%

Functional Materials from Nanocellulose: Utilizing Structure–Property Relationships in Bottom‐Up Fabrication

et al. 2020

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It is inherently challenging to recapitulate the precise hierarchical architectures found throughout nature (such as in wood, antler, bone, and silk) using synthetic bottom‐up fabrication strategies. However, as a renewable and naturally sourced nanoscale building block, nanocellulose—both cellulose nanocrystals and cellulose nanofibrils—has gained significant research interest within this area. Altogether, the intrinsic shape anisotropy, surface charge/chemistry, and mechanical/rheological properties are some of the critical material properties leading to advanced structure‐based functionality within nanocellulose‐based bottom‐up fabricated materials. Herein, the organization of nanocellulose into biomimetic‐aligned, porous, and fibrous materials through a variety of fabrication techniques is presented. Moreover, sophisticated material structuring arising from both the alignment of nanocellulose and via specific process‐induced methods is covered. In particular, design rules based on the underlying fundamental properties of nanocellulose are established and discussed as related to their influence on material assembly and resulting structure/function. Finally, key advancements and critical challenges within the field are highlighted, paving the way for the fabrication of truly advanced materials from nanocellulose.

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“…[ 12a,24 ] Surprisingly, there have only been a handful of reports demonstrating the synthesis of high surface area chiral metals despite their potential for chiral sensing, catalysis, and separation. [ 12a,25 ] Therefore, it is of great interest to use CNMS as a hard‐template to create chiral materials with high surface area.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Chiral Nematic Mesoporous Metal and Metal Oxide Nanocomposites and their Use as Heterogeneous Catalysts

et al. 2020

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We report the synthesis of chiral nematic mesoporous metal and metal oxide nanocomposites containing zinc or copper prepared through a vacuum‐assisted loading of the metal precursor into a chiral nematic mesoporous silica template followed by high‐temperature treatment. Significant metal loading into the template was achieved after a single loading cycle (up to 55 % of the pore volume) as confirmed by nitrogen sorption measurements. Growth of the metal nanoparticles was contained within the porous silica template, and subsequent removal of the template afforded free‐standing chiral nematic metal oxide films with surface areas up to 200 m2/g. To demonstrate the utility of these high surface area materials, we used the prepared CuO material as a heterogeneous catalyst for click reactions. Our prepared CuO showed excellent activity (95 % conversion after seven hours) when compared to commercially available CuO nanoparticles (20 % conversion after 24 hours) owing to its considerably higher surface area. Moreover, the prepared CuO material maintained high activity (>70 % conversion) after four cycles.

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Chiral nematic porous germania and germanium/carbon films

Cited by 29 publications

References 77 publications

Effect of SWCNT Content and Water Vapor Adsorption on the Electrical Properties of Cellulose Nanocrystal-Based Nanohybrids

Effect of SWCNT Content and Water Vapor Adsorption on the Electrical Properties of Cellulose Nanocrystal-Based Nanohybrids

Functional Materials from Nanocellulose: Utilizing Structure–Property Relationships in Bottom‐Up Fabrication

Synthesis of Chiral Nematic Mesoporous Metal and Metal Oxide Nanocomposites and their Use as Heterogeneous Catalysts

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