In the final process of bleached kraft pulp there are some cellulose fibers that separated from main stream; these rejected and considered as a low quality fibers, known fiber (RF). present work potential use for Cellulose Nanocrystals (CNCs) synthesis was studied. The physical chemical properties synthesized CNCs were characterized through different techniques such Atomic Force Microscopy (AFM), Scanning Electron (SEM), X-Ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy...

Selective surface modification of biobased fibers affords effective individualization and functionalization into nanomaterials, as exemplified by the TEMPO-mediated oxidation. However, such a route leads to changes native chemistry, affecting interparticle interactions limiting development potential supermaterials. Here we introduce methodology extract elementary cellulose fibrils treatment biomass with N-succinylimidazole, achieving regioselective C6-OH, which can be reverted using mild...

We use dry-jet wet spinning in a coaxial configuration by extruding an aqueous colloidal suspension of oxidized nanocellulose (hydrogel shell) combined with airflow the core. The coagulation hydrogel water bath results hollow filaments (HF) that are drawn continuously at relatively high rates. Small-angle and wide-angle X-ray scattering (SAXS/WAXS) reveals orientation order cellulose sheath, depending on applied shear flow drying method (free-drying under tension). obtained dry HF show...

Background Cystoscopy-assisted submucosal injections of urethral bulking agents offer a safe and efficient alternative to surgery for treating urinary incontinence in both dogs women. To address the concern their transient therapeutic effect, preclinical study evaluating biocompatibility, safety, durability nanofibrillated cellulose as agent was designed. Plant-based is considered renewable, biocompatible, non-degradable vivo . best our knowledge, no studies injected into wall experimental...

Hydrogels of TEMPO-oxidized nanocellulose were stabilized for dry-jet wet spinning using a shell cellulose dissolved in 1,5-diazabicyclo[4.3.0]non-5-enium propionate ([DBNH][CO2Et]), protic ionic liquid (PIL). Coagulation an acidic water bath resulted continuous core-shell filaments (CSFs) that tough and flexible with average dry (and wet) toughness ∼11 (2) MJ·m-3 elongation ∼9 (14) %. The CSF morphology, chemical composition, thermal stability, crystallinity, bacterial activity assessed...

In the last years, Chile has increased production of blueberries; consequently, a large number lignocellulosic residues derived from harvesting and pruning are being generated. These commonly burned, therefore increasing CO2 emissions. This study focuses on extraction two added-value products blueberry (BPRs), cellulose nanocrystals (CNC-IL) isolated using ionic liquid (IL) 1-ethyl-3-methylimidazolium [emim][Cl], carboxylated nanocellulose (TOCNC), with (2,2,6,6-tetramethylpiperidine-1-yl)...

Direct ink writing via single or multihead extrusion is used to synthesize layer-by-layer (LbL) meshes comprising renewable polysaccharides. The best mechanical performance (683 ± 63 MPa modulus and 2.5 0.4 tensile strength) observed for 3D printed structures with full infill density, given the role of electrostatic complexation between oppositely charged components (chitosan cellulose nanofibrils). LbL develop an unexpectedly high wet stability that undergoes gradual weight loss at neutral...

Cellulose nanofiber films (CNFF) were treated via a welding process using ionic liquids (ILs). Acid–base-conjugated ILs derived from 1,5-diazabicyclo[4.3.0]non-5-ene [DBN] and 1-ethyl-3-methylimidazolium acetate ([emim][OAc]) utilized. The removal efficiency of welded CNFF was assessed liquid-state nuclear magnetic resonance (NMR) spectroscopy Fourier transform infrared (FTIR). mechanical physical properties indicated surface plasticization CNFF, which improved transparency. Upon treatment,...

Current carbon capture and utilization (CCU) technologies require high energy input costly catalysts. Here, an effective pathway is offered that addresses climate action by atmospheric CO2 sequestration. Industrially relevant highly reactive alkali cellulose solutions are used as absorption media. The latter lead to mineralized materials (MCM) at a tailorable cellulose-to-mineral ratio, forming organic-inorganic viscous systems (viscosity from 102 107 mPa s storage modulus 10 105 Pa)....

The deconstruction and valorization of chitinous biomass from crustaceans is a promising route for sustainable bioproduct development alternative to petroleum-based materials. However, chitin nanocrystal nanofibril isolation crustacean shells often subjected extensive processing, compromising their environmental cost sustainability. To address the sustainability challenge that presents, herein we introduce mild fibrillation generate "chitin pulp"; where careful control macro-...

Abstract Ionic Liquids (ILs) have been used to address issues such as recyclability, cost-effectiveness, and tailored thermophysical properties. This is most relevant recent efforts directed at dissolving cellulose for filament spinning bioproduct development. Herein, we introduce a simple method investigate how interactions between films (roughness, Rh = 37 nm) ILs specifically 1-butyl-3-methylimidazolium acetate ([bmim][OAc]), chloride ([bmim][Cl]), 1-ethyl-3-methylimidazolium...

We study the long-time behavior of nonnegative solutions to theCauchy problem$ \rho(x)\, \partial_t u= \Delta u^m $ in $Q$:$=\mathbb{R}^N\times\mathbb{R}_+$$u(x, 0)=u_0 $\mathbb{R}^N$in dimensions N\ge 3$. assume that m> 1 and $\rho(x) is positive bounded with \rho(x)\leC|x|^{-\gamma} as |x|\to\infty$ $\gamma>2$. Theinitial data $u_0$ are have finite energy, i.e.,$ \int \rho(x)u_0 dx show this case nontrivial problem havea universal separate variables form$u(x,t)$~$ t^{-1/(m-1)}W(x),$where...

Forestry industries in Chile are facing an important challenge-diversifying their products using green technologies. In this study, the potential use of Ionic Liquids (ILs) to dissolve and hydrolyze eucalyptus wood (mix Eucalyptus nitens globulus) kraft pulp was studied. The Bleached Hardwood Kraft Pulp (BHKP) from a Chilean mill used together with five different ILs: 1-butyl-3-methylimidazolium chloride [bmim][Cl], acetate [bmim][Ac], hydrogen sulfate [bmim][HSO4],...

We investigate the interplay between cellulose crystallization and aggregation with interfibrillar interactions, shear forces, local changes in medium's acidity. The latter is affected by CO

We study the long-time behavior of non-negative, finite-energysolutions to initial value problem for Porous MediumEquation with variable density, i.e. solutions problem\begin{eqnarray*}\rho (x) \partial_{t} u = \Delta u^{m}, \quad in Q:= R^n \times R_+, \\ u(x,0)=u_{0}(x), in\quad R^n,\end{eqnarray*}where $m>1$, $u_0\in L^1(R^n, \rho(x)dx)$ and $n\ge 3$.We assume that $\rho (x)\sim C|x|^{-2}$ as $|x|\to\infty$ in$R^n$. Such a decay rate turns out be critical. Weshow limit can described terms...

Agriculture residues from blueberries were transformed into added-value products and materials using γ-valerolactone an ionic liquid.

We study the questions of existence and uniqueness ofnon-negative solutions to Cauchy problem$\rho(x)\partial_t u= \Delta u^m\qquad$in $Q$:$=\mathbb R^n\times\mathbb R_+$$u(x, 0)=u_0$in dimensions $n\ge 3$. deal with a class solutionshaving finite energy$E(t)=\int_{\mathbb R^n} \rho(x)u(x,t) dx$for all $t\ge 0$. assume that $m> 1$ (slow diffusion) andthe density $\rho(x)$ is positive, bounded smooth. Weprove weak starting from data $u_0\ge 0$with energy. show takes place if $\rho$has...

We address the limited solubility and early onset of gelation aqueous sodium hydroxide to position it as a preferred green solvent for cellulose. For this purpose, we expand concentration window (up 12 wt%) by using CO2-depleted air adjusting time dope remains in given atmosphere, before further processing (holding time) regeneration conditions. Cellulose solutions are extruded following characteristic (rheology extrusion) parameters yield aligned filaments reaching tenacities up 2.3...

Kraft pulp cellulose was hydrolyzed using sulfuric acid, under different thermophysical conditions of temperature, time, concentration, and sonication time. The experimental design revealed the effect these their interaction on hydrolysis yield obtained. In addition, top five nanocrystals (CNCs) yields from this experiment were analyzed. results obtained indicated that CNCs possess a morphology can be described as individualized rod particles, with average diameters less than 50 nm size...

The Pd-catalyzed reductive amination of phenol is sensitive to the support's nature, and atoms' coordination in palladium clusters.

Surface tensions of two ionic liquids (IL): 1-ethyl-3-methylimidazolium ethyl sulfate and 1-butyl-3-methylimidazolium hexafluorophosphate in pressurized atmospheres argon carbon dioxide have been measured over the temperature range (303 to 366) K pressure (0.1 15) MPa for case atmosphere 5) by using a pendant drop tensiometer. Based on experimental measurements, isothermal surface tension all IL–gas systems studied decreases as increases, evidencing gas adsorption at IL interface. Isobaric...

We investigate qualitative properties of solutions to the Cauchy problem for equation $\rho(x)u_t=(u^m)_{xx}-c_0 u^p$, where $m>1$ and $c_0, p >0$; initial data are nonnegative with compact support density $\rho(x)>0$ satisfies suitable decay conditions as $|x|\to\infty$. If $p \ge m$ $\rho(x)$ decays not faster than $|x|^{-k}$, $0 <k \le k^*:=2(p-1)/(p-m)$, interfaces exist globally in time. On contrary, if $|x|^{-k}$ $k>k^*$, can disappear finite It is also proved that go zero uniformly $t...

Chile is the second largest global producer of blueberries, which are harvested in south-central region.As a result exponential production growth, large amount lignocellulosic biomass generated from pruning and left on ground as waste.As an alternative to current incineration practices their negative air pollution effects, this study proposed value-added utilization these agroindustry residues.The chemical compositions (cellulose, hemicellulose, lignin, extractives, ash) residues blueberry...

Chusquea quila or “quila”, is one of the most abundant lesser-known species from Chile, and for many years it has created problems farmers in southern part this country. In study, was examined as a promising resource high-tech materials. The chemical physical properties were determined by ASTM standards. extractives, ash content, lignin, alpha-cellulose 4.55%, 2.17%, 13.78%, 54.65%, respectively. higher heating value basic density obtained 5,106 kcal/kg 290 kg/m3, moisture content studied...