Kristallstruktur und Quellung von Montmorillonit

Hofmann, Ulrich; Endell, Kurd; Wilm, Diederich

doi:10.1524/zkri.1933.86.1.340

Cited by 108 publications

(66 citation statements)

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“…Alternatively, osmotic swelling potentially represents a gentler, cheap and scalable route to utterly separate a layered material into singular layers. Langmuir 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 The principle of osmotic swelling goes back to the swelling of graphite oxide (1932) (13) and montmorillonite (14). Here we report a systematic study of the exfoliation of a synthetic 2D layered silicate via osmotic swelling that provides direct insight into the conditions for ionic layer separation and the build-up of the electric double layer, and outlines the lyotropic phase behavior at extreme aspect ratios of the resulting layered material over more than 4 orders of magnitude in concentration from the dry powder to highly dilute solutions.…”

Section: Introductionmentioning

confidence: 99%

In-Depth Insights into the Key Steps of Delamination of Charged 2D Nanomaterials

Rosenfeldt¹,

Stöter²,

Schlenk³

et al. 2016

Langmuir

158

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ABSTRACT:Delamination is a key step to obtain individual layers from inorganic layered materials needed for fundamental studies and applications. For layered van-der-Waals materials like graphene the adhesion forces are small allowing for mechanical exfoliation, whereas for ionic layered materials like layered silicates the energy to separate adjacent layers is considerably higher. Quite counter intuitively, we show for a synthetic layered silicate (Na 0.5 -hectorite) that a scalable and quantitative delamination by simple hydration is possible for high and correlated. This is indicated by fulfilling the classical Hansen-Verlet and Lindeman criteria for melting. We provide insight into the requirements for layer separation and controlling the layer distances for a broad range of materials and outline an important pathway for the integration of layers into devices for advanced applications.

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Section: Introductionmentioning

confidence: 99%

In-Depth Insights into the Key Steps of Delamination of Charged 2D Nanomaterials

Rosenfeldt¹,

Stöter²,

Schlenk³

et al. 2016

Langmuir

158

View full text Add to dashboard Cite

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“…Pauling (1930a,b) published detailed XRD spectra of clays and established the structure of micas, brittle micas, talc, pyrophyllite, and chlorites. Th e structure of other clays quickly followed, such as kaolinite (Ross and Kerr, 1931), montmorillonite (Hofmann et al, 1933;Ross and Hendricks, 1945), and vermiculite (Gruner, 1934).…”

Section: X-ray Diffractionmentioning

confidence: 99%

Historical Perspective on the Tools That Helped Shape Soil Chemistry

Schulthess

2011

Soil Science Society of America Journal

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SSSA 75 th Anniversary Paper T he tools of soil chemistry include instruments, mathematics, models, and software. Th ere is also the mind and imagination. Th roughout the history of our science, we have been shift ing away from a very labor-intensive laboratory environment, where long hours of concentration on tedious tasks was the norm. Th is change in the way we work has been accelerating, particularly since the 1950s. We are accomplishing more work but with less eff ort and more time to contemplate what the data are trying to tell us. Th e essence of our research activity has changed dramatically.Numerous laboratory tools have been used in soil chemistry during the last 200 yr, and the major changes that have occurred are highlighted here. It is hoped that the picture presented will help us decide how to better train our students for the future. By knowing how we have changed in the past and how we appear to be changing in the present, we can perhaps trace the path that we are taking, at least in the near future.Eight major themes are addressed here:1. Th e early years reviews the research environment of the 1800s up to the early 1900s. It marks the beginning years of soil chemistry that shaped many of our ideas for the decades that followed.2. Th e age of electronics covers the early part of the 1900s and the origins of the fi rst portable meters on the market.3. Spectroscopy is at the core of most of our modern methods of analysis. While the development of only a few tools are described here, the impact of spectroscopy on our current research activity cannot be understated.

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“…At the Technische Hochschule in Berlin, Hofmann et al (1933) suggested an atomic arrangement for montmorillonite that featured an expanding structure. Variable numbers of layers of water molecules were possible between the silicate sheets, thereby providing a variable c-axis dimension.…”

Section: Development Of the "Clay Minerals" Conceptmentioning

confidence: 99%

The History of the Development of Clay Mineralogy

Grim

1988

Clays and clay miner.

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Kristallstruktur und Quellung von Montmorillonit

Cited by 108 publications

References 0 publications

In-Depth Insights into the Key Steps of Delamination of Charged 2D Nanomaterials

In-Depth Insights into the Key Steps of Delamination of Charged 2D Nanomaterials

Historical Perspective on the Tools That Helped Shape Soil Chemistry

The History of the Development of Clay Mineralogy

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