関連する実験動画
Updated: Jul 3, 2026

11:32
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
ピラミッド状の鉛硫化水晶体で,高エネルギー面を持つ
Dongbo Fan1, P John Thomas, Paul O'Brien
1School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
Journal of the American Chemical Society
|July 30, 2008
まとめ
研究者は,結晶石の形状を制御するための新しい方法を開発し,液体インターフェイスで鉛硫化物 (PbS) ピラミッドを成長させました. この技術は,調節可能な寸法と,棒や球のような多様な結晶形状を可能にします.
科学分野:
- 材料科学 材料科学とは
- クリスタログラフィーです.
- ナノテクノロジー ナノテクノロジー
背景:
- 水晶の形状を制御することは,材料の性質を調整するために非常に重要です.
- 液体-液体インターフェイスは,結晶の成長にユニークな環境を提供します.
- 結晶石の形状を制御する以前の方法には限界があります.
研究 の 目的:
- 結晶石の形状を制御するための新しい一般的な方法について報告する.
- 鉛硫化物 (PbS) の結晶が異常なピラミッド形に成長することを調査する.
- 結晶の習慣と組立に対する液体-液体界面の影響を調査する.
主な方法:
- 鉛硫化物 (PbS) の結晶を水とトルエンの接点で増やす.
- 液体-液体界面に特有の現象を利用して,結晶の成長を誘導する.
- その結果生じる単結晶ピラミッドとその成長習慣を特徴づける.
主要な成果:
- PbS結晶は,水とトルーエンのインターフェイスでユニークなピラミッド形に成長することに成功しました.
- ピラミッドは,特定の成長習慣 ([113]方向に沿って成長が遅い) を有する単結晶構造を示した.
- ピラミッドの底辺の寸法は575~1260nmの範囲で制御可能に変化していた.
- 棒や球を含む他の形状は,インターフェースの特性を変更することによって得られた.
結論:
- 結晶石の形状を制御するための新しい一般的な方法が実証されました.
- 液体-液体インターフェイスは,結晶の成長と組み立てを指示するための強力なプラットフォームを提供します.
- このアプローチは,ナノテクノロジーにおける潜在的な応用を持つ様々なPbSナノ構造の調整可能な合成を可能にします.
関連する概念動画
Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
The Seven Crystal Systems: Overview
Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...
Imperfections in Crystal Structure: Point, Line and Plane Defects
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Symmetry Elements in a Crystal
Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...

