Construction of the Cellulose Nanofibers (CNFs) Aerogel Loading TiO2 NPs and Its Application in Disposal of Organic Pollutants

Aerogels have been widely used in the adsorption of pollutants because of their large specific surface area. As an environmentally friendly natural polysaccharide, cellulose is a good candidate for the preparation of aerogels due to its wide sources and abundant polar groups. In this paper, an approach to construct cellulose nanofibers aerogels with both the good mechanical property and the high pollutants adsorption capability through chemical crosslinking was explored. On this basis, TiO2 nanoparticles were loaded on the aerogel through the sol-gel method followed by the hydrothermal method, thereby the enriched pollutants in the aerogel could be degraded synchronously. The chemical cross-linker not only helps build the three-dimensional network structure of aerogels, but also provides loading sites for TiO2. The degradation efficiency of pollutants by the TiO2@CNF Aerogel can reach more than 90% after 4 h, and the efficiency is still more than 70% after five cycles. The prepared TiO2@CNF Aerogels have high potential in the field of environmental management, because of the high efficiency of treating organic pollutes and the sustainability of the materials. The work also provides a choice for the functional utilization of cellulose, offering a valuable method to utilize the large amount of cellulose in nature.

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Effect of the drying on morphology and texture of aerogels and zirconia cryogels

MRS Advances ◽

10.1557/adv.2019.450 ◽

2019 ◽

Vol 4 (64) ◽

pp. 3513-3521

Author(s):

Tzipatly A. Esquivel-Castro ◽

Antonia Martínez-Luévanos ◽

Luis Alfonso García-Cerda ◽

Juan C. Contreras-Esquivel ◽

Pascual Bartolo Pérez ◽

...

Keyword(s):

Drug Delivery ◽

Cetyltrimethylammonium Bromide ◽

Sol Gel ◽

Three Dimensional ◽

Supercritical Drying ◽

Sem Images ◽

Texture Properties ◽

Dimensional Network ◽

Zirconia Aerogel

ABSTRACTDue to their excellent properties, aerogel has attracted the attention of the scientific community to use it in the biomedical area as a drug delivery system. This work reports on the synthesis and characterization of ZrO2 aerogels and cryogels obtained by the sol-gel method. The influence of different cetyltrimethylammonium bromide (CTAB) and the type of drying on structural, morphological and texture properties of ZrO2 aerogels and cryogels was investigated. SEM images reveal that a porous interconnected three-dimensional network was formed into aerogels due to supercritical drying. Zirconia aerogel sample has a specific surface area (SBET) larger than zirconia cryogels. Therefore, our results indicate that zirconia aerogel is an adequate material for applications in drug delivery systems.

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NMR and FTIR Characterization of Sol-Gel Derived Ternary Oxide Glasses in the System BaO–TIO2–SiO2

Zeitschrift für Naturforschung A ◽

10.1515/zna-1995-0908 ◽

1995 ◽

Vol 50 (9) ◽

pp. 837-844 ◽

Cited By ~ 1

Author(s):

M. Feike ◽

K. Meise-Gresch ◽

Qi Chen ◽

G.H. Frischat

Keyword(s):

Chemical Shifts ◽

Glassy State ◽

Sol Gel ◽

Three Dimensional ◽

Ternary Oxide ◽

Oxide Glasses ◽

Ftir Characterization ◽

Dimensional Network ◽

Silicate Structure ◽

History Of

Abstract The annealing history of glasses in the system (20-40) BaO-40TiO2(40-20)SiO2 has been monitored by 29Si MAS NMR and FTIR spectroscopy from the dried gel to the final glassy state. Assignment of chemical shifts to specific building units has been facilitated by comparative studies of the limiting less complex binary silicate systems. From the NMR spectra at various compositions appreciable condensation to a three-dimensional network is inferred already at low drying temperatures. Processes like the pyrolysis of acetate rests of the starting materials and modification of the silicate structure due to Ba2+ cations have been mirrored in the spectra of both methods for samples annealed at intermediate temperatures. The microstructure of the final gel glass of the ternary system has been determined spectroscopically to consist of silicate and titanate species typical of crystalline fresnoite, whereas remaining amounts of TiO2 and SiO2 develop a separate network each. Only small amounts of Si-O-Ti linkages have been recognized in the vibrational absorptions; they vanish at higher annealing stages.

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A High Throughput and High Selective Chemiluminescence Method for Quantification of Bifenthrin Based on Molecularly Imprinted Film

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.663 ◽

2011 ◽

Vol 306-307 ◽

pp. 663-666 ◽

Cited By ~ 1

Author(s):

De Jin Zang ◽

Lei Ge ◽

Pei Ni Zhao ◽

Jing Hua Yu ◽

Jia Dong Huang

Keyword(s):

High Throughput ◽

Sol Gel ◽

Three Dimensional ◽

Food Samples ◽

Chemiluminescence Method ◽

Molecularly Imprinted ◽

Equilibrium Binding ◽

Dimensional Network ◽

Gel Film ◽

Molecularly Imprinted Film

One novel highly cross-linked, shape-controllable molecularly imprinted sol-gel film (MISF) with good thermal and chemical stability and three-dimensional network porous structure has been developed. The binding characteristic of the imprinted film to bifenthrin was evaluated by equilibrium binding experiments and imprinting-induced promotion of binding. The MISF was modified into the wells of 96 micro-well plate combined with chemiluminescence (CL) technology to establish the molecular imprinting-chemiluminescence (MI-CL) sensor. The high throughput and high selective detection sensor of bifenthrin was applied in vegetable and food samples with satisfactory results.

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Optically Transparent Nanocomposite Based on Cellulose Nanofibers from Newspapers and Polyurethane

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.905 ◽

2012 ◽

Vol 174-177 ◽

pp. 905-911 ◽

Cited By ~ 3

Author(s):

Xue Ting Li ◽

Da Gang Li ◽

Li Xu ◽

Yu Mei Wang ◽

Dong Liang Lin

Keyword(s):

Tensile Strength ◽

Elastic Modulus ◽

Cellulose Nanofibers ◽

Three Dimensional ◽

High Strength ◽

Wood Powder ◽

Sem Images ◽

High Transparency ◽

Dimensional Network ◽

Optically Transparent

The goal of this paper was to develop an optically transparent nanocomposite with high strength by reinforcing polyurethane (PU) with cellulose nanofibers (CNFs) extracted from newspapers. The FE-SEM images show that through chemical and mechanical treatments, newspaper CNFs with diameters ranged from 20 to 100 nm and an aspect ratio of over 1000 were successfully obtained as well as wood powder. They were cross-linked together and formed a special three-dimensional network structure. The nanocomposite was fabricated by impregnating the CNF sheet into transparent PU resin and cured under ultraviolet. Results demonstrate that the transparency of newspaper CNF/PU nanocomposite was as high as wood CNF/PU nanocomposite. The elastic modulus and tensile strength of newspaper CNF/PU composite were increased roughly eighteen times and two times respectively while retaining the high transparency of PU, which was nearly the same with wood CNF/PU composite.

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Freezing Dynamical Sol-gel processes with the controlled environment vitrification system (CEVS)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100126573 ◽

1987 ◽

Vol 45 ◽

pp. 356-357

Author(s):

J. R. Bellare ◽

J. K. Bailey ◽

M. L. Mecartney

Keyword(s):

Sol Gel ◽

Particle Surface ◽

Three Dimensional ◽

Colloidal Dispersions ◽

Submicron Particles ◽

Surface Charges ◽

Stable Suspension ◽

Dimensional Network ◽

Processing Techniques

A sol is a stable suspension of submicron particles in a liquid while a gel is a three dimensional network of these particles which is bicontinuous with the liquid phase. Sol particles are stabilized by surface charges or by steric hindrance of molecules on the particle surface. Sols can be gelled by the agglomeration of the particles; for example, by reducing the inter-particle repulsion with the addition of a salt. The sol-gel transformation is an important industrial, biological and household process. Novel ceramic processing techniques, blood-clotting, and white-sauce manufacturing are some diverse examples. Therefore, there has been extensive interest in relating the gel structure to changes in the physical properties that occur during gelation.Direct observation of thin vitrified films is the preferred technique for microstructural determination of colloidal dispersions in the size range of 1-1000nm.

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High-Efficiency Air Filter Media with a Three-Dimensional Network Composed of Core–Shell Zeolitic Imidazolate Framework-8@Tunicate Nanocellulose for PM0.3 Removal

ACS Applied Materials & Interfaces ◽

10.1021/acsami.1c17052 ◽

2021 ◽

Author(s):

Zhongyuan Huang ◽

Chao Dang ◽

Zhaoxia Sun ◽

Haisong Qi

Keyword(s):

High Efficiency ◽

Three Dimensional ◽

Core Shell ◽

Filter Media ◽

Zeolitic Imidazolate Framework ◽

Air Filter ◽

Dimensional Network

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Synthesis and Application of Molecularly Imprinted Sol-Gel Film for Simultaneous Determination of Multi-Component Pesticide Residue

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.1667 ◽

2011 ◽

Vol 306-307 ◽

pp. 1667-1672 ◽

Cited By ~ 1

Author(s):

Shen Guang Ge ◽

Pei Ni Zhao ◽

Jing Hua Yu ◽

Jia Dong Huang

Keyword(s):

Simultaneous Determination ◽

Pesticide Residue ◽

Sol Gel ◽

Three Dimensional ◽

Molecularly Imprinted ◽

Dimensional Network ◽

Lambda Cyhalothrin ◽

Gel Film ◽

Recognition Efficiency

In this paper, three kinds of molecularly imprinted sol-gel film (MISF) which have good thermal and chemical stability and three-dimensional network porous structure have been developed. The material was synthesized by sol-gel technology using lambda-cyhalothrin, trichlorphon and beta-cyfluthrin as model analytes. The special structural behavior makes the material have good capability to seizure and capture template molecules which enhanced the MISF’s recognition efficiency and the property of separation and enrichment. The material was environmental friendly and easy to operate. The binding characteristic of the imprinted film to the three pesticides was evaluated by equilibrium binding experiments. The SEM of the three MISF has been performed to characterize the morphology of MISF. The MISFs were combined with chemiluminescence (CL) technology by modifying the sol-gel into 96 micro-well plate to establish one molecular imprinting- chemiluminescence (MI-CL) sensor which realized high selectivity, sensitivity and high throughput simultaneous assay of three pesticides. The proposed method was successfully applied to the simultaneous determination of multi-component pesticide residue in foodstuff.

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Polarized Raman Spectra from Some Sol-Gel Precursors and Micro-Raman Study of One Selected Copolymer

Applied Spectroscopy ◽

10.1366/0003702934334787 ◽

1993 ◽

Vol 47 (10) ◽

pp. 1600-1603 ◽

Cited By ~ 24

Author(s):

U. Posset ◽

M. Lankers ◽

W. Kiefer ◽

H. Steins ◽

G. Schottner

Keyword(s):

Raman Spectra ◽

Condensation Product ◽

Sol Gel ◽

Three Dimensional ◽

Oh Groups ◽

Dimensional Network ◽

Raman Study ◽

Polarized Raman ◽

A Minor ◽

High Degree

The polarized Raman spectra of γ-substituted propyl-trialkoxysilanes [Formula: see text] have been recorded, and an assignment is proposed. The spectra are briefly discussed with emphasis on the glycidoxy compound (IV). Micro-Raman data are also given for the co-condensation product of a 5:95 mixture of III and IV. The copolymer spectrum is compared to the precursor spectrum to show the effect of condensation on some selected vibrational bands. No bands for residual, noncondensed Si-OH groups are found in the polymer spectrum from which condensation to a three-dimensional network can be assumed to a high degree. The epoxy ring-breathing vibrational band indicates the ring to be cleaved only to a minor extent by reaction with the base catalyst.

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Preparation and Properties of Novel Superhydrophobic Cellulose Nanofiber Aerogels

Journal of Nanomaterials ◽

10.1155/2021/2631405 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Guoqing Liu ◽

Jing Li ◽

Xiaodong Li ◽

Xiangjun Pan ◽

Chao Qian

Keyword(s):

Thermal Insulation ◽

Raw Materials ◽

Sol Gel ◽

Cellulose Nanofibers ◽

Three Dimensional ◽

Volume Ratio ◽

Laser Flash ◽

Cellulose Nanofiber ◽

Water Contact ◽

Before And After

The superhydrophobic cellulose nanofiber aerogels were prepared via sol-gel and subsequent freeze-drying with cellulose nanofibers as raw materials and perfluorohexyl ethyl trimethoxysilane and 3-aminopropyl trimethoxysilane as modifying monomers. The effect of volume ratio and total dosage of the two modifying monomers on the superhydrophobic properties was investigated, and the property variations of the cellulose nanofibers before and after modification were also characterized by FT-IR, XRD, TGA, SEM, XPS, and laser flash diffusivity apparatus. The results showed that the modifying monomers were successfully grafted onto cellulose nanofibers, and the prepared modified cellulose nanofiber aerogels had higher thermal stability. After modification, a micron-level arrayed three-dimensional grid superhydrophobic surface structure was constructed, and the surface energy was reduced. The prepared aerogels exhibited superhydrophobicity with a water contact angle up to 151° and excellent thermal insulation performance with a thermal conductivity of 0.035 W·m−1·K−1, which displayed promising application potential in the field of thermal insulation and waterproof materials.

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