Lignosulfonate as a byproduct of wood pulp production:  A potential precursor for the preparation of functional hybrid materials

<p>Functional hybrid materials based on magnesium lignosulfonate and silica were obtained and characterized. Magnesium lignosulfonate is a common waste product of the wood pulp industry, while silica is a well-known inorganic material with exceptional physicochemical properties. In this study, silicas with a spherical particle shape were synthesized using a sol-gel method and alternatively in a nonpolar medium. Silica was found to improve the thermal and electrokinetic properties of the final products. The resulting lignosulfonate/silica hybrid materials were analyzed with the use of advanced techniques and measuring methods: scanning electron microscopy, a laser diffraction method enabling particle size measurements, Fourier transform infrared spectroscopy, elemental analysis, thermogravimetry, electrophoretic light scattering, zeta potential measurements, low-temperature nitrogen sorption, and colorimetric analysis. The results enabled the hybrid materials to be characterized from the point of view of potential applications in various branches of industry (for example as polymer fillers, electroactive blends and biosorbents). We additionally indicate new methods for the utilization of waste products, a category to which lignosulfonate certainly belongs.</p>

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Strength Parameters of Paver Blocks By Incorporating Used Foundry Sand

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.b5132.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 4705-4711

Keyword(s):

Manufacturing Industry ◽

Environmental Problem ◽

Waste Product ◽

Value Added ◽

Point Of View ◽

Strength Parameters ◽

Foundry Sand ◽

Waste Products ◽

New Methodologies ◽

Value Added Products

All over the world the handling and disposal of waste products from the manufacturing industry are of big concern these days. In this context, the volume of used foundry sand is such that the disposal creates a big environmental problem for all the countries where the foundry industries are in abundance. New methodologies should be employed to utilize the used foundry sand in making value-added products in a commercial manner to keep the environment free from the potential adverse effects of the accumulation of this waste product. This research is an attempt to put forward the idea of utilizing the used foundry sand in commercial production of value-added products like paver blocks from a techno-economical point of view. This will be beneficial to the ecological and environmental systems for sustainable development progressing towards a greener world.

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UV Curable Organic-Inorganic Hybrid Materials

MRS Proceedings ◽

10.1557/proc-628-cc6.14 ◽

2000 ◽

Vol 628 ◽

Cited By ~ 1

Author(s):

Guang-Way Jang ◽

Ren-Jye Wu ◽

Yuung-Ching Sheen ◽

Ya-Hui Lin ◽

Chi-Jung Chang

Keyword(s):

Hybrid Materials ◽

Colloidal Silica ◽

Sol Gel ◽

Solution Ph ◽

Uv Curable ◽

Inorganic Hybrid ◽

Degradation Temperature ◽

Sol Gel Process ◽

The Stability ◽

Thermal Degradation Temperature

This work successfully prepared an UV curable organic-inorganic hybrid material consisting of organic modified colloidal silica. Applications of UV curable organic-inorganic hybrid materials include abrasion resistant coatings, photo-patternable thin films and waveguides. Colloidal silica containing reactive functional groups were also prepared by reacting organic silane and tetraethyl orthosilicate (TEOS) using sol-gel process. In addition, the efficiency of grafting organic moiety onto silica nanoparticles was investigated by applying TGA and FTIR techniques. Experimental results indicated a strong interdependence between surface modification efficiency and solution pH. Acrylate-SiO2 hybrid formation could result in a shifting of thermal degradation temperature of organic component from about 200°C to near 400°C. In addition, the stability of organic modified colloidal silica in UV curable formula and the physical properties of resulting coatings were discussed. Furthermore, the morphology of organic modified colloidal silica was investigated by performing TEM and SEM studies‥

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The Influence of Polymer on Fe(II)Citrate Release from Hybrid Materials Synthesized via Sol–Gel

Macromolecular Symposia ◽

10.1002/masy.201900057 ◽

2020 ◽

Vol 389 (1) ◽

pp. 1900057

Author(s):

Michelina Catauro ◽

Elisabetta Tranquillo ◽

Giovanni Dal Poggetto ◽

Daniele Naviglio ◽

Federico Barrino

Keyword(s):

Hybrid Materials ◽

Sol Gel ◽

Citrate Release

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Synthesis, Structural, Morphological and Thermal Characterization of Five Different Silica-Polyethylene Glycol-Chlorogenic Acid Hybrid Materials

Polymers ◽

10.3390/polym13101586 ◽

2021 ◽

Vol 13 (10) ◽

pp. 1586

Author(s):

Michelina Catauro ◽

Pavel Šiler ◽

Jiří Másilko ◽

Roberta Risoluti ◽

Stefano Vecchio Ciprioti

Keyword(s):

Polyethylene Glycol ◽

Chlorogenic Acid ◽

Hybrid Materials ◽

Sol Gel ◽

Antibacterial Properties ◽

Silica Matrix ◽

Sem Images ◽

Fixed Amount ◽

Organic Components ◽

Free Material

The present study investigated the structure, morphology, thermal behavior, and bacterial growth analysis of novel three-component hybrid materials synthesized by the sol-gel method. The inorganic silica matrix was weakly bonded to the network of two organic components: a well-known polymer such as polyethylene glycol (PEG, average molar mass of about 4000 g/mol), and an antioxidant constituted by chlorogenic acid (CGA). In particular, a first series was made by a 50 wt% PEG-based (CGA-free) silica hybrid along with two 50 wt% PEG-based hybrids containing 10 and 20 wt% of CGA (denoted as SP50, SP50C10 and SP50C20, respectively). A second series contained a fixed amount of CGA (20 wt%) in silica-based hybrids: one was the PEG-free material (SC20) and the other two contained 12 and 50 wt% of PEG, respectively (SP12C20 and SP50C20, respectively), being the latter already included in the first series. The X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of freshly prepared materials confirmed that all the materials were amorphous and homogeneous regardless of the content of PEG or CGA. The thermogravimetric (TG) analysis revealed a higher water content was adsorbed into the two component hybrids (SP50 and SC20) because of the availability of a larger number of H-bonds to be formed with water with respect to those of silica/PEG/CGA (SPC), where silica matrix was involved in these bonds with both organic components. Conversely, the PEG-rich materials (SP50C10 and SP50C20, both with 50 wt% of the polymer) retained a lower content of water. Decomposition of PEG and CGA occurred in almost the same temperature interval regardless of the content of each organic component. The antibacterial properties of the SiO2/PEG/CGA hybrid materials were studied in pellets using either Escherichia coli and Enterococcus faecalis, respectively. Excellent antibacterial activity was found against both bacteria regardless of the amount of polymer in the hybrids.

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Changes in Optical Properties upon Dye–Clay Interaction: Experimental Evaluation and Applications

Nanomaterials ◽

10.3390/nano11010197 ◽

2021 ◽

Vol 11 (1) ◽

pp. 197

Author(s):

Giorgia Giovannini ◽

René M. Rossi ◽

Luciano F. Boesel

Keyword(s):

Optical Properties ◽

Hybrid Materials ◽

High Performance ◽

Fluorescent Properties ◽

Chemical Mechanisms ◽

Strong Electrostatic Interaction ◽

Potential Applications ◽

Photochemical Properties ◽

Physical And Chemical ◽

The Relationship

The development of hybrid materials with unique optical properties has been a challenge for the creation of high-performance composites. The improved photophysical and photochemical properties observed when fluorophores interact with clay minerals, as well as the accessibility and easy handling of such natural materials, make these nanocomposites attractive for designing novel optical hybrid materials. Here, we present a method of promoting this interaction by conjugating dyes with chitosan. The fluorescent properties of conjugated dye–montmorillonite (MMT) hybrids were similar to those of free dye–MMT hybrids. Moreover, we analyzed the relationship between the changes in optical properties of the dye interacting with clay and its structure and defined the physical and chemical mechanisms that take place upon dye–MMT interactions leading to the optical changes. Conjugation to chitosan additionally ensures stable adsorption on clay nanoplatelets due to the strong electrostatic interaction between chitosan and clay. This work thus provides a method to facilitate the design of solid-state hybrid nanomaterials relevant for potential applications in bioimaging, sensing and optical purposes.

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Physico-mechanical properties of plywood bonded with ecological adhesives from Acacia mollissima tannins and lignosulfonates

The European Physical Journal Applied Physics ◽

10.1051/epjap/2017170067 ◽

2017 ◽

Vol 78 (3) ◽

pp. 34813 ◽

Cited By ~ 6

Author(s):

Naima Rhazi ◽

Mina Oumam ◽

Abdessadek Sesbou ◽

Hassan Hannache ◽

Fatima Charrier-El Bouhtoury

Keyword(s):

Mechanical Properties ◽

Mechanical Performance ◽

Phenol Formaldehyde ◽

Waste Product ◽

Formaldehyde Emission ◽

Extraction Methods ◽

Press Temperature ◽

Pulp Industry ◽

Pressing Time ◽

Chemical Conditions

The objective of this research was to develop ecological adhesives for bonding plywood panels using lignosulfonates, a common waste product of the wood pulp industry, and natural tannin extracted from Moroccan bark of Acacia mollissima using different process. Natural tannin and lignin were used in wood adhesives formulation to substitute resins based on phenol and formaldehyde. To achieve this, the lignosulfonates were glyoxalated to enhance their reactivity and the used tannins obtained by three different extraction methods were compared with commercial mimosa tannin. The proportion of Acacia mollissima tannins and lignosulfonates, the pressing time, the pressing temperature, and the pressure used were studied to improve mechanical properties, and bonding quality of plywood panel. The properties of plywood panels produced with these adhesives were tested in accordance with normative tests. Thus, the tensile strength, and the shear strength were measured. The results showed that the performance of the plywood panels made using biobased tannin adhesives was influenced by physical conditions such as pressure, press temperature as well as by chemical conditions, such as the tannin-lignin ratio. It exhibited excellent mechanical properties comparable to commercially available phenol-formaldehyde plywood adhesives. This study showed that biobased adhesives formulations presented good and higher mechanical performance and no formaldehyde emission.

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The preparation of poly(methylsilsesquioxane) network-polyimide hybrid materials by the sol-gel process and their properties

High Performance Polymers ◽

10.1088/0954-0083/6/1/005 ◽

1994 ◽

Vol 6 (1) ◽

pp. 43-52 ◽

Cited By ~ 24

Author(s):

Yoshitake Iyoku ◽

Masa-aki Kakimoto ◽

Yoshio Imai

Keyword(s):

Hybrid Materials ◽

Sol Gel ◽

Tensile Modulus ◽

Hybrid Films ◽

Elongation At Break ◽

Dimethyl Acetamide ◽

Flexible Films ◽

Sol Gel Process ◽

Heating Up ◽

Silicone Content

Poly(methylsilsesquixoane) network (silicone)-polyimide hybrid materials were successfully prepared by the sol-gel reaction of methyltriethoxysilane (MTES). The ethoxysilyl group in MTES was hydrolyzed and polycondensed in the solution of the polyamic acid, derived from pyromellitic dianhydride and bis(4-aminophenyl)ether, in N,N-dimethyl-acetamide (DMAc). The hybrid films were obtained by casting the reaction mixture, followed by heating up to 300°C. The hybrid materials containing 0-60wt% of silicone afforded flexible films. The films containing less than 7 wt% silicone were yellow and transparent, whereas the films with higher silicone content were yellow and opaque. Silicone particles with a diameter of around 1-10 μm were observed in the fracture surface of the hybrid films by scanning electron microscopy. Although the tensile strength and tensile modulus of the films obtained decreased with increasing silicone content. the value of the elongation at break remained at 60% up to 30% silicone content.

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