A5017014287- Semiconductor materials and devices
- Biofuel production and bioconversion
- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Semiconductor materials and interfaces
- Polysaccharides and Plant Cell Walls
- Advancements in Semiconductor Devices and Circuit Design
- Electronic and Structural Properties of Oxides
- Sugarcane Cultivation and Processing
- Integrated Circuits and Semiconductor Failure Analysis
- Copper Interconnects and Reliability
- Metal and Thin Film Mechanics
- Food composition and properties
- Silicon Effects in Agriculture
- Ion-surface interactions and analysis
- Catalysis for Biomass Conversion
- Geochemistry and Elemental Analysis
- Mineral Processing and Grinding
- Biochemical and biochemical processes
- Electrospun Nanofibers in Biomedical Applications
- Advanced ceramic materials synthesis
- Ferroelectric and Negative Capacitance Devices
- Electron and X-Ray Spectroscopy Techniques
- Aluminum toxicity and tolerance in plants and animals
- Catalytic Processes in Materials Science
Brazilian Center for Research in Energy and Materials
2014-2024
Laboratório Nacional de Nanotecnologia
2024
Brazilian Biosciences National Laboratory
2024
Kansas State University
2024
Canadian Light Source (Canada)
2024
Laboratório Nacional de Ciência e Tecnologia do Bioetanol
2010-2022
Universidade de São Paulo
2010-2022
Universidade Federal do Rio Grande do Sul
2003-2009
Universidade Federal do Rio Grande
2007
The University of Texas at Dallas
2007
In this study, we investigated the enzymatic hydrolysis of pretreated sugarcane bagasse using eight different blends obtained from concentrated crude enzyme extracts produced by Penicillium funiculosum and Trichoderma harzianum as well in combination with a commercial cocktail. The influence levels biomass delignification, degree crystallinity lignicellulose, composition activities BSA on yields (HYs) was evaluated. Our X-ray diffraction studies showed that lignocellulose is not key...
Abstract As the most abundant biopolymer on Earth, cellulose is a key structural component of plant cell wall. Cellulose produced at plasma membrane by synthase (CesA) complexes (CSCs), which are assembled in endomembrane system and trafficked to membrane. While several proteins that affect CesA activity have been identified, components regulate CSC assembly trafficking remain unknown. Here we show STELLO1 2 Golgi-localized can interact with CesAs control quantity. In absence STELLO...
This work defines the crystallinity of cellulose I materials on a dry-weight basis. Theoretical and experimental developments in X-ray diffraction lead to determination method that is estimated reach 1σ accuracies better than 0.05 (crystallinity defined between 0 1). The based Rietveld modelling, resolve Bragg peaks, standard truncated invariant integral. Corrections are derived account for incoherent scattering, moisture content other compositional deviations from pure cellulose....
Dynamic vapor sorption and thermoporometry probe complementary dimensions of water interaction with cellulose. While is primarily sensitive to the first hydration layers, nanometric water-filled pores. In this article, these analytical techniques are detailed applied model mesoporous materials a wide spectrum celluloses. Correlations between explored. dynamic sorption, celluloses present general characteristic time desorption. On other hand, they highly variable times indicating that...
Thin cellulose nanofiber (CNF) nanostructured substrates with varying roughness, stiffness (Young's modulus), porosity, and swelling properties were produced by the conditions used during fabrication. It was shown that increased heat exposure, CNF substrate porosity in an aqueous state decreased while Young's modulus a water submerged increased. In this study, adhesion viability of mesenchymal stem cells (MSCs) cultured on will be presented. Viability D1/BALBc MSCs assessed for 24 48 h, it...
Mechanical refining is a low-capital and well-established technology used in pulp paper industry to improve fiber bonding for product strength. Refining can also be applied biorefinery context overcome the recalcitrance of pretreated biomass by opening up structure modifying substrate properties (e.g., morphology, particle size, porosity, crystallinity), which increases enzyme accessibility improves carbohydrate conversion. Although several characterization methods have been identify changes...
We report the optical properties of unannealed hafnium–aluminate (HfAlO) films grown by atomic layer chemical vapor deposition (ALCVD) and correlate them with aluminum contents in films. Vacuum ultraviolet spectroscopic ellipsometry (VUV-SE), high-resolution transmission electron microscopy (HRTEM), channeling Rutherford backscattering spectrometry (RBS), resonant nuclear reaction analysis (NRA) were employed to characterize these In analyses data, a double Tauc–Lorentz dispersion produces...
Relating cellulose structure to its water uptake is a classical problem with many investigations done through measurements of "crystallinity". However, there presently growing consensus that crystallinity are appreciably uncertain, leading ambiguous interpretations underlying organization. In this scenario, article revisits the relations between and uptake, moving emphasis away from degree directing it toward crystallite width, which inferred less ambiguity broadening 200 X-ray diffraction...
The chemical environment of N in nitrided aluminum oxide films on Si(001) was investigated by angle-resolved x-ray photoelectron spectroscopy. Two different bonding configurations were identified, namely N–Al and N–O–Al, suggesting the formation AlN AlO2N compounds. near-surface region is N-rich compounds therein are more abundant than AlO2N, whereas bulk regions proportions these two comparable. Rapid thermal annealing at 1000 °C for 10 s vacuum or low-pressure oxygen atmosphere led to...
Cellulose physical properties like crystallinity, porosity, and particle size are known to influence cellulase activity, but knowledge is still insufficient for activity prediction from such measurable substrate characteristics. With the aim of illuminating enzyme-substrate relationships, this work evaluates a purified hyperthermophilic endo-1,4-beta-glucanase (from Pyrococcus furiosus) acting on 13 celluloses characterized crystallinity crystal width (by X-ray diffraction), wet porosity...
Alkaline deacetylation has emerged as a promising chemistry for pretreatments performed prior to enzymatic saccharification of lignocellulosic biomass. This process avoids complex pressurized reactors and opens new opportunities lignin covalorization. In this work, we evaluate the chemical morphological response sugar cane bagasse straw submitted alkaline treatments. solutions (0.4% w/w NaOH, 70 °C, 3 h) well proximal conditions (0.1–0.7% 55–85 1–5 chosen by 23 experimental design were...
X-ray computed microtomography (μCT) is an innovative and nondestructive versatile technique that has been used extensively to investigate bio-based systems in multiple application areas. Emerging progress this field brought countless studies using μCT characterization, revealing three-dimensional (3D) material structures quantifying features such as defects, pores, secondary phases, filler dispersions, internal interfaces. Recently, x-ray tomography (CT) beamlines coupled synchrotron light...
Phytoliths of biogenic silica play a vital role in the silicon biogeochemical cycle and occlude fraction organic carbon. The location, chemical speciation, quantification this carbon within phytoliths have remained elusive due to limited direct experimental evidence. In work, ( bilobate morphotype) from sugarcane stalk epidermis are sectioned with focused ion beam produce lamellas (≈10 × 10 μm 2 size, <500 nm thickness) probed by synchrotron scanning transmission X-ray microspectroscopy...
LaAlO 3 films were deposited on p-type Si(100) by sputtering from a LaAlO3 target. C×V characteristics determined in nonannealed and O2-annealed capacitors having as dielectric RuO2 top electrode. Thermal annealing O2 atmosphere reduced flat band voltage to acceptable values for advanced Si-based devices. O16–O18 isotopic substitution was characterized Rutherford backscattering spectrometry nuclear resonant reaction profiling. Chemical analysis of the accomplished x-ray photoelectron...