Growth and aging phenomena in silica gels

Pantos, E.; West, J. B.; Dokter, WH Wim; Garderen, van Hf; Beelen, Tpm Theo; Santen, van Ra Rutger

doi:10.1007/bf00486255

Cited by 9 publications

(2 citation statements)

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“…[64,66] The gelation process causes Brownian motion of each colloid particle, and then the particles collide, causing agglomeration. [67][68][69][70] It starts with the Na-silicate solution, which is precipitated with HCl to convert the sol phase into the gel phase as schemed in Figure 10A. The results indicate that biosilica nanoparticles have a solid-on-solid aggregate type, which is strengthened by the accumulation of particles on top of each other [71][72][73] as shown in SEM captures in Figure 10B-E.…”

Section: Surface Area Pore Diameter and Pore Volume Of Bio-silica Nan...mentioning

confidence: 99%

Optimization of purity and yield of amorphous bio‐silica nanoparticles synthesized from bamboo leaves

Bindar,

Ramli,

Steven

et al. 2023

Can J Chem Eng

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The fallen yellowish bamboo leaves around bamboo crops are always overlooked even though they contain high silica in their ash. Bamboo leaf valorization consequently has the potential to be a green process for synthesizing amorphous silica. Unfortunately, the optimum process parameters have not been widely disclosed. Hence, this study intends to optimize the synthesis of amorphous bio‐silica nanoparticles from bamboo leaves using Box–Behnken design (BBD). Bamboo leaves were initially washed with HCl, followed by combustion at 700°C, and then ash washing, extraction of silica with NaOH (sol–gel method), gelation, and drying. According to the results, optimum conditions occur under no acid washing of leaves, solvent‐to‐feed ratio = 5 mL/g, and extraction duration = 1.5 h. The optimum conditions give the highest purity (94.1 wt.%) and yield (42.33%) as well as the highest surface area (328.61 m2/g), smallest pore diameter (8.69 nm), and largest pore volume (0.71 cc/g) of bio‐silica nanoparticles. Furthermore, bio‐silica nanoparticles are amorphous, spherical‐shaped aggregates, and have a white powdered colour.

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Section: Surface Area Pore Diameter and Pore Volume Of Bio-silica Nan...mentioning

confidence: 99%

Optimization of purity and yield of amorphous bio‐silica nanoparticles synthesized from bamboo leaves

Bindar,

Ramli,

Steven

et al. 2023

Can J Chem Eng

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“…Many spectroscopic techniques are now available. The use of synchrotron radiation to in situ follow aggregation and crystallization is an example [59].…”

Section: Trends In Catalytic Disciplinesmentioning

confidence: 99%

Catalysis: Closing the molecular and macroscopic sciences gap

Santen

1995

Chemical Engineering Science

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Almraet--Progress in catalysis is described as the result of the interplay between societal demands and autonomous scientific developments. A short historic review of the succession of new catalytic processes that took place in the course of this century is given. Also the development of' catalysis as a scientific discipline is sketched. Three branches of catalysis are distinguished. Physical chemistry developing into catalytic reaction engineering, kinetics and catalyst characterization, inorganic chemistry as a basis to catalyst preparation and coordination chemistry leading to organometallic chemistry and homogeneous catalysis. It is shown how catalysis science changes from a descriptive science, focusing on structure-performance relations to a predictive science, with a basis in molecular mechanistic understanding. Major modern concepts in fundamental catalysis are discussed. The paper is concluded with an outline of trends in the different scientific catalytic disciplines. The need to integrate disciplinary approaches into system approaches is pointed out.

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