scholarly journals In-situ Preparation of Nano-calcium Carbonate/Cellulose Fiber Composite and Its Application in Fluff Pulp

2017 ◽  
Vol 12 (3) ◽  
pp. 155892501701200 ◽  
Author(s):  
Yongjian Xu ◽  
Chunmei Jiang ◽  
Chao Duan ◽  
Weipeng Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Calcium Carbonate ◽  
Adsorption Capacity ◽  
Fiber Composite ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Natural Polymers ◽  
Inorganic Particles ◽  
In Situ Preparation

Calcium carbonate/cellulose fiber composites combining natural polymers and inorganic particles are promising materials for preparing fluff pulp. In this study, calcium carbonate (CaCO3) particles were in-situ precipitated on cellulose fiber surfaces to decrease the level of hydrogen bonding. The results showed that nano CaCO3 particles precipitated and dispersed well on the fiber surface. The fluff pulp made from cellulose/CaCO3 modified fibers exhibited high effectiveness in the dry defibration process and good adsorption capacity due to the weak hydrogen bonding. The burst index of the handsheets decreased 31% (based on the ash content of 1.48 wt. %) without compromising the adsorption capacity of the fluff pulp.

scholarly journals Ionic Liquids as Delaminating Agents of Layered Double Hydroxide during In-Situ Synthesis of Poly (Butylene Adipate-co-Terephthalate) Nanocomposites

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 618 ◽  
Author(s):  
Hynek Beneš ◽  
Jana Kredatusová ◽  
Jakub Peter ◽  
Sébastien Livi ◽  
Sonia Bujok ◽  
...  
Keyword(s):  
Food Packaging ◽  
Water Vapor Permeability ◽  
Nanocomposite Films ◽  
Precipitation Method ◽  
Vapor Permeability ◽  
Inorganic Particles ◽  
In Situ Preparation ◽  
End Use ◽  
Co Precipitation

Currently, highly demanded biodegradable or bio-sourced plastics exhibit inherent drawbacks due to their limited processability and end-use properties (barrier, mechanical, etc.). To overcome all of these shortcomings, the incorporation of lamellar inorganic particles, such as layered double hydroxides (LDH) seems to be appropriate. However, LDH delamination and homogenous dispersion in a polymer matrix without use of harmful solvents, remains a challenging issue, which explains why LDH-based polymer nanocomposites have not been scaled-up yet. In this work, LDH with intercalated ionic liquid (IL) anions were synthesized by a direct co-precipitation method in the presence of phosphonium IL and subsequently used as functional nanofillers for in-situ preparation of poly (butylene adipate-co-terephthalate) (PBAT) nanocomposites. The intercalated IL-anions promoted LDH swelling in monomers and LDH delamination during the course of in-situ polycondensation, which led to the production of PBAT/LDH nanocomposites with intercalated and exfoliated morphology containing well-dispersed LDH nanoplatelets. The prepared nanocomposite films showed improved water vapor permeability and mechanical properties and slightly increased crystallization degree and therefore can be considered excellent candidates for food packaging applications.

Facile in situ preparation of high-performance epoxy vitrimer from renewable resources and its application in nondestructive recyclable carbon fiber composite

2019 ◽  
Vol 21 (6) ◽  
pp. 1484-1497 ◽  
Author(s):  
Sheng Wang ◽  
Songqi Ma ◽  
Qiong Li ◽  
Xiwei Xu ◽  
Binbo Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Renewable Resources ◽  
High Performance ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
In Situ Preparation

A high-performance epoxy vitrimer was facilely prepared from a renewable lignin derivative vanillin, and its carbon-fiber composites were nondestructively recycled.

scholarly journals Polyaniline-deposited cellulose fiber composite prepared via in situ polymerization: enhancing adsorption properties for removal of meloxicam from aqueous media

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12639-12649 ◽  
Author(s):  
Flávia Viana Avelar Dutra ◽  
Bruna Carneiro Pires ◽  
Tienne Aparecida Nascimento ◽  
Valdir Mano ◽  
Keyller Bastos Borges
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Spectroscopy ◽  
In Situ Polymerization ◽  
Fiber Composite ◽  
Aqueous Media ◽  
Cellulose Fiber ◽  
Adsorption Properties ◽  
Scanning Electron

Polyaniline (PAni), cellulose fiber (CF) and a PAni–CF composite, which were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetry, were investigated in adsorption studies of meloxicam (MLX) from aqueous media.

scholarly journals Facile Biosynthesis and Antioxidant Property of Nanogold-Cellulose Fiber Composite

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Nattinee Bumbudsanpharoke ◽  
Jungwook Choi ◽  
Insik Park ◽  
Seonghyuk Ko
Keyword(s):  
Antioxidant Activity ◽  
Gold Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Color Change ◽  
Diffuse Reflectance Spectroscopy ◽  
Fiber Composite ◽  
Light Condition ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
X Ray

Direct synthesis of gold nanoparticles (AuNPs) on cellulose fiber has been successfully performed via facile green approach using lignin-containing unbleached kraft softwood pulp. The resulting AuNPs composited fibers showed apparent color change from pale yellow to purplish-dark brown by varying the amount of gold ions (Au3+) due to the surface plasmon resonance of nanogold. Further confirmation of AuNP formation on the fiber surface was conducted by UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). X-ray photoelectron spectroscopy (XPS) analysis revealed that gold nanoparticles formed on the fiber are well-defined pure metallic gold, indicating that Au3+ions are efficiently bioreduced into Au0and bind to the fiber surface. Antioxidant activity was evaluated by decomposition of 2,2-diphenyl-1-picryl-hydrazyl (DPPH) in dark and light condition. As-prepared unbleached kraft fiber-AuNP composite showed significantly enhanced antioxidant activity and its DPPH scavenging rate reached about 86.05%.

scholarly journals Improving the Adsorption Performance of Loofah Sponge towards Methylene Blue by Coating Ca2+ Crosslinked Sodium Alginate Layers on Its Fiber Surface

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 814
Author(s):  
Xiaohu Qiang ◽  
Xin Guo ◽  
Qiling Quan ◽  
Hongxi Su ◽  
Dajian Huang
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Sodium Alginate ◽  
Fiber Surface ◽  
Carboxyl Groups ◽  
Batch Adsorption ◽  
Loofah Sponge ◽  
Experimental Parameters ◽  
Loading Ratio

In this study, natural polymer sodium alginate (SA) was covered with high active carboxyl groups on the loofah sponge (LS) fiber surface to improve the adsorption ability of LS. The SA was covered on the LS fiber surface (LS@SA) through simple soaking in SA solution and then in situ hardening in Ca2+ solution. The influence of SA consistency on the SA loading ratio was estimated. The obtained LS@SA adsorbents were employed to absorb methylene blue (MB) from the water. The effects of various experimental parameters on the adsorption capacity of the LS@SA adsorbents were studied using a batch adsorption technique. Results indicated that the SA was successfully covered on the LS fiber surface and the SA loading rate increased with increasing SA concentration. The SA layer covering the LS fiber surface provided the LS@SA adsorbents with higher adsorption capacity towards MB than the original LS due to the high density of carboxyl groups on the SA molecular chain. In the adsorption process, the LS@SA adsorbents were pH dependent. The results also indicate that the LS@SA adsorbents have better reusability.

Study on in situ preparation of nano calcium carbonate/PMMA composite particles

2006 ◽  
Vol 60 (19) ◽  
pp. 2410-2415 ◽  
Author(s):  
Wei Wu ◽  
Taobo He ◽  
Jian-feng Chen ◽  
Xueqin Zhang ◽  
Yuxi Chen
Keyword(s):  
Calcium Carbonate ◽  
Composite Particles ◽  
In Situ Preparation

In situ preparation of calcium carbonate films

2012 ◽  
Vol 520 (6) ◽  
pp. 1842-1846 ◽  
Author(s):  
S. Dahle ◽  
F. Voigts ◽  
W. Maus-Friedrichs
Keyword(s):  
Calcium Carbonate ◽  
In Situ Preparation

scholarly journals FABRICATION OF CELLULOSE-BASED CHITOSAN COATING ADSORBENTS FOR CAPTURE TO CADMIUM (II) AND ZINC (II)

2018 ◽  
Vol 55 (4C) ◽  
pp. 224
Author(s):  
Truong Thi Cam Trang
Keyword(s):  
Adsorption Capacity ◽  
Fiber Surface ◽  
Cellulose Fiber ◽  
Chitosan Coating ◽  
Enhanced Adsorption

Cellulose fiberous adsorbent (CCCF) was prepared from sugacane agasse by coating chitosan  on the fiber surface. The chitosan layer coated on the cellulose fiber enhanced adsorption to Cd2+ and Zinc2+. High efficency of the CCCF of removal % for the Cd (II) and Zn (II) was  with  93.7 % and 93.0 %, respectively and the adsorption capacity was 2.0 mg/g.

A TEM study of the microstructure of avian eggshells

1992 ◽  
Vol 50 (2) ◽  
pp. 1102-1103
Author(s):  
S. Q. Xiao ◽  
S. Baden ◽  
A. H. Heuer
Keyword(s):  
Electron Microscope ◽  
Calcium Carbonate ◽  
Nucleation And Growth ◽  
Growth Mechanisms ◽  
Shell Surface ◽  
Thin Sections ◽  
Polycrystalline Metals ◽  
Transmission Electron ◽  
Nucleation And Growth Mechanisms

The avian eggshell is one of the most rapidly mineralizing biological systems known. In situ, 5g of calcium carbonate are crystallized in less than 20 hrs to fabricate the shell. Although there have been much work about the formation of eggshells, controversy about the nucleation and growth mechanisms of the calcite crystals, and their texture in the eggshell, still remain unclear. In this report the microstructure and microchemistry of avian eggshells have been analyzed using transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS).Fresh white and dry brown eggshells were broken and fixed in Karnosky's fixative (kaltitanden) for 2 hrs, then rinsed in distilled H2O. Small speckles of the eggshells were embedded in Spurr medium and thin sections were made ultramicrotome.The crystalline part of eggshells are composed of many small plate-like calcite grains, whose plate normals are approximately parallel to the shell surface. The sizes of the grains are about 0.3×0.3×1 μm3 (Fig.l). These grains are not as closely packed as man-made polycrystalline metals and ceramics, and small gaps between adjacent grains are visible indicating the absence of conventional grain boundaries.

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