The dynamic development of exclusion zones on cellulosic surfaces

Sulbaran, Belkis; Toríz, Guillermo; Allan, G. G.; Pollack, Gerald H.; Delgado, Ezequiel

doi:10.1007/s10570-014-0165-y

Cited by 19 publications

(14 citation statements)

References 13 publications

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“…The coating of gold particles by amphiphilic lipids could affect the size and penetration capacity of pit membranes pores. Besides the hydrophobic and charged nature of the colloidal gold particles, their perfusion may also be affected by electroviscosity (Santiago, Pagay, & Stroock, ) and impenetrable boundary layers (Sulbaran, Toriz, Allan, Pollack, & Delgado, ). Therefore, our TEM observations of gold perfused xylem may represent a relative indication of pore constriction sizes, and it is possible that pore constrictions are slightly larger than what we experimentally measured.…”

Section: Discussionmentioning

confidence: 99%

High porosity with tiny pore constrictions and unbending pathways characterize the 3D structure of intervessel pit membranes in angiosperm xylem

Zhang

Carmesin

Kaack

et al. 2019

Plant Cell & Environment

108

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Pit membranes between xylem vessels play a major role in angiosperm water transport. Yet, their three‐dimensional (3D) structure as fibrous porous media remains unknown, largely due to technical challenges and sample preparation artefacts. Here, we applied a modelling approach based on thickness measurements of fresh and fully shrunken pit membranes of seven species. Pore constrictions were also investigated visually by perfusing fresh material with colloidal gold particles of known sizes. Based on a shrinkage model, fresh pit membranes showed tiny pore constrictions of ca. 20 nm, but a very high porosity (i.e. pore volume fraction) of on average 0.81. Perfusion experiments showed similar pore constrictions in fresh samples, well below 50 nm based on transmission electron microscopy. Drying caused a 50% shrinkage of pit membranes, resulting in much smaller pore constrictions. These findings suggest that pit membranes represent a mesoporous medium, with the pore space characterized by multiple constrictions. Constrictions are much smaller than previously assumed, but the pore volume is large and highly interconnected. Pores do not form highly tortuous, bent, or zigzagging pathways. These insights provide a novel view on pit membranes, which is essential to develop a mechanistic, 3D understanding of air‐seeding through this porous medium.

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Section: Discussionmentioning

confidence: 99%

High porosity with tiny pore constrictions and unbending pathways characterize the 3D structure of intervessel pit membranes in angiosperm xylem

Zhang

Carmesin

Kaack

et al. 2019

Plant Cell & Environment

108

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“…where IC (%) is crystallinity degree , I002 is the crystalline peak of the maximum intensity at 2θ between 22° and 23° for cellulose I, and Iam is the crystalline peak of the minimum intensity at 2θ between 18° and 19° for cellulose I (Sulbarán et al 2014). A Digital Instruments NanoScope III controller with a MultiMode Atomic Force Microscopy (AFM) (Bruker, Billerica, USA) head was used to image the CNCs.…”

Section: Cnc Characterizationmentioning

confidence: 99%

Agave tequilana Bagasse as Source of Cellulose Nanocrystals via Organosolv Treatment

Hernandez¹,

Romero²,

Escalante³

et al. 2018

BioResources

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Cellulose nanocrystals (CNCs) were isolated from Agave tequilana residues derived from ethanol production. Hemicelluloses and lignin extraction from agave bagasse was carried out via organosolv (ethanol/acetic) digestion followed by conventional sulfuric acid hydrolysis. The ethanol/acetic acid treatment resulted in cellulose yields of approximately 67% after lignin and ash removal. Compared to soda and sodium chlorite treatments with organosolv, the time and chemical load needed for delignification were remarkably reduced. The morphology of the cellulose fiber obtained in the three treatments was between 0.55 and 0.62 mm, with which CNC was obtained in the order of 83 to 195 nm in length. It is noteworthy that the longest cellulose fibers and nanocrystals were obtained from organosolv cellulose. The organosolv treatment led to a high purity cellulose, derived CNCs with a minimum energy consumption and mild chemical usage, and also considered the use of material streams associated with distillation processes. Thus, a viable alternative is suggested for the production of high quality CNC from widely available residual biomass that otherwise poses environmental and health-related risks.

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“…Or when we iteratively filter water through cellulose nitrate filters, the powerful flow of water in the very thin pores of the filter breaks the lumps of interfacial water [4]. Cellulose membranes, like other hydrophilic membranes, induce formation of hundreds of micrometers (µm) wide interfacial water zone [6][7][8]. This region "excludes" medium-sized molecules (e.g., dyes), huge molecules (e.g., proteins), small unicellular microorganism, electrically charged microspheres with diameters of 0.5-2.0 µm [6].…”

Section: Introductionmentioning

confidence: 99%

Water perturbed by cellophane: comparison of its physicochemical properties with those of water perturbed with cotton wool or Nafion

Elia

Napoli

Germano

et al. 2020

J Therm Anal Calorim

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We present experimental data on water repetitively brought in contact with cellophane. Although this hydrophilic polymer is insoluble in water, repetitively immersing it in water changes the liquid's properties. We compare the physicochemical properties of the water left over after removing the cellophane to those of previously published data on water repetitively brought in contact with other in water insoluble polymers (cotton wool or Nafion). Some of the properties are similar. All the properties considerably differ from those of the Milli-Q ® water used. On lyophilizing these waters, solid residues remain. The residues are soluble in water. The chemical nature of the residues differs from that of the perturbing polymers.

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The dynamic development of exclusion zones on cellulosic surfaces

Cited by 19 publications

References 13 publications

High porosity with tiny pore constrictions and unbending pathways characterize the 3D structure of intervessel pit membranes in angiosperm xylem

High porosity with tiny pore constrictions and unbending pathways characterize the 3D structure of intervessel pit membranes in angiosperm xylem

Agave tequilana Bagasse as Source of Cellulose Nanocrystals via Organosolv Treatment

Water perturbed by cellophane: comparison of its physicochemical properties with those of water perturbed with cotton wool or Nafion

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